RITONAVIR tablet, film coated

Ritonavir by

Drug Labeling and Warnings

Ritonavir by is a Prescription medication manufactured, distributed, or labeled by West-Ward Pharmaceuticals Corp., Cipla Limited. Drug facts, warnings, and ingredients follow.

Drug Details [pdf]

  • BOXED WARNING (What is this?)

    WARNING: DRUG-DRUG INTERACTIONS LEADING TO POTENTIALLY SERIOUS AND/OR LIFE THREATENING REACTIONS

    Co-administration of ritonavir with several classes of drugs including sedative hypnotics, antiarrhythmics, or ergot alkaloid preparations may result in potentially serious and/or life-threatening adverse events due to possible effects of ritonavir on the hepatic metabolism of certain drugs. Review medications taken by patients prior to prescribing ritonavir or when prescribing other medications to patients already taking ritonavir [see Contraindications (4), Warnings and Precautions (5.1)].

  • 1 INDICATIONS AND USAGE

    Ritonavir tablets are indicated in combination with other antiretroviral agents for the treatment of HIV-1 infection.

  • 2 DOSAGE AND ADMINISTRATION

    2.1 General Administration Recommendations

    • Ritonavir must be used in combination with other antiretroviral agents.
    • Ritonavir is administered orally. Ritonavir tablets should be swallowed whole, and not chewed, broken or crushed. Take ritonavir with meals.

    General Dosing Guidelines:

    Patients who take the 600 mg twice daily soft gel capsule ritonavir dose may experience more gastrointestinal side effects such as nausea, vomiting, abdominal pain or diarrhea when switching from the soft gel capsule to the tablet formulation because of greater maximum plasma concentration (Cmax) achieved with the tablet formulation relative to the soft gel capsule [see Clinical Pharmacology (12.3)]. Patients should also be aware that these adverse events (gastrointestinal or paresthesias) may diminish as therapy is continued.

    2.3 Dosage Recommendations in Adults

    Recommended Dosage for Treatment of HIV-1:

    The recommended dosage of ritonavir is 600 mg twice daily by mouth to be taken with meals. Use of a dose titration schedule may help to reduce treatment-emergent adverse events while maintaining appropriate ritonavir plasma levels. Ritonavir should be started at no less than 300 mg twice daily and increased at 2 to 3 day intervals by 100 mg twice daily. The maximum dose of 600 mg twice daily should not be exceeded upon completion of the titration [see Dosage and Administration (2.6)].

    Pregnant Women:

    Ritonavir oral solution is not recommended during pregnancy due to its ethanol content. Ritonavir oral solution contains the excipients ethanol (approx. 43% v/v) and propylene glycol (approx. 27% w/v) [see Use in Specific Populations (8.1)].

    2.4 Dosage Recommendations in Pediatric Patients

    Ritonavir must be used in combination with other antiretroviral agents [see Dosage and Administration (2)]. The recommended dosage of ritonavir in pediatric patients older than 1 month is 350 to 400 mg per m2 twice daily by mouth to be taken with meals and should not exceed 600 mg twice daily. Ritonavir should be started at 250 mg per m2 twice daily and increased at 2 to 3 day intervals by 50 mg per m2 twice daily. If patients do not tolerate 400 mg per m2 twice daily due to adverse events, the highest tolerated dose may be used for maintenance therapy in combination with other antiretroviral agents, however, alternative therapy should be considered [see Dosage and Administration (2.6)].

    Pediatric Dosage Guidelines for Oral Solution:

    Ritonavir oral solution should not be administered to neonates before a postmenstrual age (first day of the mother’s last menstrual period to birth plus the time elapsed after birth) of 44 weeks has been attained [see Warnings and Precautions (5.2)].

    Ritonavir oral solution contains the excipients ethanol (approx. 43% v/v) and propylene glycol (approx. 27% w/v). Special attention should be given to accurate calculation of the dose of ritonavir, transcription of the medication order, dispensing information and dosing instructions to minimize the risk for medication errors, and overdose. This is especially important for young children. Total amounts of ethanol and propylene glycol from all medicines that are to be given to pediatric patients 1 to 6 months of age should be taken into account in order to avoid toxicity from these excipients [see Warnings and Precautions (5.2) and Overdosage (10)]. When possible, dose should be administered using a calibrated dosing syringe.

    Table 1. Pediatric Dosage Guidelines for Oral Solution*
  • * The concentration of the oral solution is 80 mg per mL.
    		•

    Body Surface

    Area (m2)

    Twice Daily Dose

    250 mg per m2

    Twice Daily Dose

    300 mg per m2

    Twice Daily Dose

    350 mg per m2

    Twice Daily Dose

    400 mg per m2

    0.20

    0.6 mL (50 mg)

    0.75 mL (60 mg)

    0.9 mL (70 mg)

    1.0 mL (80 mg)

    0.25

    0.8 mL (62.5 mg)

    0.9 mL (75 mg)

    1.1 mL (87.5 mg)

    1.25 mL (100 mg)

    0.50

    1.6 mL (125 mg)

    1.9 mL (150 mg)

    2.2 mL (175 mg)

    2.5 mL (200 mg)

    0.75

    2.3 mL (187.5 mg)

    2.8 mL (225 mg)

    3.3 mL (262.5 mg)

    3.75 mL (300 mg)

    1.00

    3.1 mL (250 mg)

    3.75 mL (300 mg)

    4.4 mL (350 mg)

    5 mL (400 mg)

    1.25

    3.9 mL (312.5 mg)

    4.7 mL (375 mg)

    5.5 mL (437.5 mg)

    6.25 mL (500 mg)

    1.50

    4.7 mL (375 mg)

    5.6 mL (450 mg)

    6.6 mL (525 mg)

    7.5 mL (600 mg)

    Body surface area (BSA) can be calculated as follows1:

    •  
      body-surface.jpg

    Pediatric Dosage Guidelines for Oral Powder:

    Ritonavir oral powder should be used only for dosing increments of 100 mg. Ritonavir powder should not be used for doses less than 100 mg or for incremental doses between 100 mg intervals. Ritonavir oral solution is the preferred formulation for patients requiring doses less than 100 mg or incremental doses between 100 mg intervals.

    2.6 Dose Modification due to Drug Interaction

    Dose reduction of ritonavir is necessary when used with other protease inhibitors: atazanavir, darunavir, fosamprenavir, saquinavir, and tipranavir.

    Prescribers should consult the full prescribing information and clinical study information of these protease inhibitors if they are co-administered with a reduced dose of ritonavir [see Warnings and Precautions (5.1), and Drug Interactions (7)].

  • 3 DOSAGE FORMS AND STRENGTHS

    Ritonavir Tablets USP, 100 mg are a white-colored, oval shaped, shallow, film-coated tablet with "54" debossed on one side and "247" debossed on the other side.

  • 4 CONTRAINDICATIONS

    • When co-administering ritonavir with other protease inhibitors, see the full prescribing information for that protease inhibitor including contraindication information.
    • Ritonavir is contraindicated in patients with known hypersensitivity (e.g., toxic epidermal necrolysis (TEN) or Stevens-Johnson syndrome) to ritonavir or any of its ingredients.
    • Ritonavir is contraindicated with drugs that are highly dependent on CYP3A for clearance and for which elevated plasma concentrations are associated with serious and/or life-threatening reactions [see Drug Interactions (7.1) and Clinical Pharmacology (12.3)].
      • o Alpha 1- Adrenoreceptor Antagonist: alfuzosin
      • o Antianginal: ranolazine
      • o Antiarrhythmics: amiodarone, dronedarone, flecainide, propafenone, quinidine
      • o Antifungal: voriconazole
      • o Anti-gout: colchicine
      • o Antipsychotics: lurasidone, pimozide
      • o Ergot Derivatives: dihydroergotamine, ergotamine, methylergonovine
      • o GI Motility Agent: cisapride
      • o HMG-CoA Reductase Inhibitors: lovastatin, simvastatin
      • o Microsomal triglyceride transfer protein (MTTP) Inhibitor: lomitapide
      • o PDE5 Inhibitor: sildenafil (Revatio®) when used for the treatment of pulmonary arterial hypertension
      • o Sedative/Hypnotics: triazolam, orally administered midazolam
    • Ritonavir is contraindicated with drugs that are potent CYP3A inducers where significantly reduced ritonavir plasma concentrations may be associated with the potential for loss of virologic response and possible resistance and cross-resistance [see Drug Interactions (7.2) and Clinical Pharmacology (12.3)].
    • o Anticancer Agents: apalutamide
    • o Herbal Products: St. John's Wort (hypericum perforatum)
  • 5 WARNINGS AND PRECAUTIONS

    5.1 Risk of Serious Adverse Reactions Due to Drug Interactions

    •   Initiation of ritonavir, a CYP3A inhibitor, in patients receiving medications metabolized by CYP3A or initiation of medications metabolized by CYP3A in patients already receiving ritonavir, may increase plasma concentrations of medications metabolized by CYP3A. Initiation of medications that inhibit or induce CYP3A may increase or decrease concentrations of ritonavir, respectively. These interactions may lead to:
    • Clinically significant adverse reactions, potentially leading to severe, life-threatening, or fatal events from greater exposures of concomitant medications.
    • Clinically significant adverse reactions from greater exposures of ritonavir.
    • Loss of therapeutic effect of ritonavir and possible development of resistance.
    •   When co-administering ritonavir with other protease inhibitors, see the full prescribing information for that protease inhibitor including important Warnings and Precautions.
    •   See Table 4 for steps to prevent or manage these possible and known significant drug interactions, including dosing recommendations [see Drug Interactions (7)]. Consider the potential for drug interactions prior to and during ritonavir therapy; review concomitant medications during ritonavir therapy, and monitor for the adverse reactions associated with the concomitant medications [see Contraindications (4) and Drug Interactions (7)].

    5.2 Toxicity in Preterm Neonates

    Ritonavir oral solution contains the excipients ethanol (approx. 43% v/v) and propylene glycol (approx. 27% w/v). When administered concomitantly with propylene glycol, ethanol competitively inhibits the metabolism of propylene glycol, which may lead to elevated concentrations. Preterm neonates may be at an increased risk of propylene glycol-associated adverse events due to diminished ability to metabolize propylene glycol, thereby leading to accumulation and potential adverse events. Postmarketing life-threatening cases of cardiac toxicity (including complete AV block, bradycardia, and cardiomyopathy), lactic acidosis, acute renal failure, CNS depression and respiratory complications leading to death have been reported, predominantly in preterm neonates receiving lopinavir/ritonavir oral solution which also contains the excipients ethanol and propylene glycol.

    Ritonavir oral solution should not be used in preterm neonates in the immediate postnatal period because of possible toxicities. However, if the benefit of using ritonavir oral solution to treat HIV infection in infants immediately after birth outweighs the potential risks, infants should be monitored closely for increases in serum osmolality and serum creatinine, and for toxicity related to ritonavir oral solution including: hyperosmolality, with or without lactic acidosis, renal toxicity, CNS depression (including stupor, coma, and apnea), seizures, hypotonia, cardiac arrhythmias and ECG changes, and hemolysis. Total amounts of ethanol and propylene glycol from all medicines that are to be given to infants should be taken into account in order to avoid toxicity from these excipients [see Dosage and Administration (2.4) and Overdosage (10)].

    5.3 Hepatotoxicity

    Hepatic transaminase elevations exceeding 5 times the upper limit of normal, clinical hepatitis, and jaundice have occurred in patients receiving ritonavir alone or in combination with other antiretroviral drugs (see Table 3). There may be an increased risk for transaminase elevations in patients with underlying hepatitis B or C. Therefore, caution should be exercised when administering ritonavir to patients with pre-existing liver diseases, liver enzyme abnormalities, or hepatitis. Increased AST/ALT monitoring should be considered in these patients, especially during the first three months of ritonavir treatment [see Use in Specific Populations (8.6)].

    There have been postmarketing reports of hepatic dysfunction, including some fatalities. These have generally occurred in patients taking multiple concomitant medications and/or with advanced AIDS.

    5.4 Pancreatitis

    Pancreatitis has been observed in patients receiving ritonavir therapy, including those who developed hypertriglyceridemia. In some cases fatalities have been observed. Patients with advanced HIV disease may be at increased risk of elevated triglycerides and pancreatitis [see Warnings and Precautions (5.7)]. Pancreatitis should be considered if clinical symptoms (nausea, vomiting, abdominal pain) or abnormalities in laboratory values (such as increased serum lipase or amylase values) suggestive of pancreatitis should occur. Patients who exhibit these signs or symptoms should be evaluated and ritonavir therapy should be discontinued if a diagnosis of pancreatitis is made.

    5.5 Allergic Reactions/Hypersensitivity

    Allergic reactions including urticaria, mild skin eruptions, bronchospasm, and angioedema have been reported. Cases of anaphylaxis, toxic epidermal necrolysis (TEN), and Stevens-Johnson syndrome have also been reported. Discontinue treatment if severe reactions develop.

    5.6 PR Interval Prolongation

    Ritonavir prolongs the PR interval in some patients. Post marketing cases of second or third degree atrioventricular block have been reported in patients.

    Ritonavir should be used with caution in patients with underlying structural heart disease, preexisting conduction system abnormalities, ischemic heart disease, cardiomyopathies, as these patients may be at increased risk for developing cardiac conduction abnormalities.

    The impact on the PR interval of co-administration of ritonavir with other drugs that prolong the PR interval (including calcium channel blockers, beta-adrenergic blockers, digoxin and atazanavir) has not been evaluated. As a result, co-administration of ritonavir with these drugs should be undertaken with caution, particularly with those drugs metabolized by CYP3A. Clinical monitoring is recommended [see Drug Interactions (7) and Clinical Pharmacology (12.3)].

    5.7 Lipid Disorders

    Treatment with ritonavir therapy alone or in combination with saquinavir has resulted in substantial increases in the concentration of total cholesterol and triglycerides [see Adverse Reactions (6.1)]. Triglyceride and cholesterol testing should be performed prior to initiating ritonavir therapy and at periodic intervals during therapy. Lipid disorders should be managed as clinically appropriate, taking into account any potential drug-drug interactions with ritonavir and HMG CoA reductase inhibitors [see Contraindications (4) and Drug Interactions (7)].

    5.8 Diabetes Mellitus/Hyperglycemia

    New onset diabetes mellitus, exacerbation of pre-existing diabetes mellitus, and hyperglycemia have been reported during postmarketing surveillance in HIV-infected patients receiving protease inhibitor therapy. Some patients required either initiation or dose adjustments of insulin or oral hypoglycemic agents for treatment of these events. In some cases, diabetic ketoacidosis has occurred. In those patients who discontinued protease inhibitor therapy, hyperglycemia persisted in some cases. Because these events have been reported voluntarily during clinical practice, estimates of frequency cannot be made and a causal relationship between protease inhibitor therapy and these events has not been established. Consider monitoring for hyperglycemia, new onset diabetes mellitus, or an exacerbation of diabetes mellitus in patients treated with ritonavir.

    5.9 Immune Reconstitution Syndrome

    Immune reconstitution syndrome has been reported in HIV-infected patients treated with combination antiretroviral therapy, including ritonavir. During the initial phase of combination antiretroviral treatment, patients whose immune system responds may develop an inflammatory response to indolent or residual opportunistic infections (such as Mycobacterium avium infection, cytomegalovirus, Pneumocystis jiroveci pneumonia, or tuberculosis), which may necessitate further evaluation and treatment.

    Autoimmune disorders (such as Graves’ disease, polymyositis, and Guillain-Barré syndrome) have also been reported to occur in the setting of immune reconstitution, however, the time to onset is more variable, and can occur many months after initiation of treatment.

    5.10 Fat Redistribution

    Redistribution/accumulation of body fat including central obesity, dorsocervical fat enlargement (buffalo hump), peripheral wasting, facial wasting, breast enlargement, and "cushingoid appearance" have been observed in patients receiving antiretroviral therapy. The mechanism and long-term consequences of these events are currently unknown. A causal relationship has not been established.

    5.11 Patients with Hemophilia

    There have been reports of increased bleeding, including spontaneous skin hematomas and hemarthrosis, in patients with hemophilia type A and B treated with protease inhibitors. In some patients additional factor VIII was given. In more than half of the reported cases, treatment with protease inhibitors was continued or reintroduced. A causal relationship between protease inhibitor therapy and these events has not been established.

    5.12 Resistance/Cross-resistance

    Varying degrees of cross-resistance among protease inhibitors have been observed. Continued administration of ritonavir 600 mg twice daily following loss of viral suppression may increase the likelihood of cross-resistance to other protease inhibitors [see Microbiology (12.4)].

    5.13 Laboratory Tests

    Ritonavir has been shown to increase triglycerides, cholesterol, SGOT (AST), SGPT (ALT), GGT, CPK, and uric acid. Appropriate laboratory testing should be performed prior to initiating ritonavir therapy and at periodic intervals or if any clinical signs or symptoms occur during therapy.

  • 6 ADVERSE REACTIONS

    The following adverse reactions are discussed in greater detail in other sections of the labeling.

    • Drug Interactions [see Warnings and Precautions (5.1)]
    • Hepatotoxicity [see Warnings and Precautions (5.3)]
    • Pancreatitis [see Warnings and Precautions (5.4)]
    • Allergic Reactions/Hypersensitivity [see Warnings and Precautions (5.5)]

    When co-administering ritonavir with other protease inhibitors, see the full prescribing information for that protease inhibitor including adverse reactions.

    6.1 Clinical Trial Experience

    Because clinical trials are conducted under widely varying conditions, adverse reactions rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice.

    Adverse Reactions in Adults:

    The safety of ritonavir alone and in combination with other antiretroviral agents was studied in 1,755 adult patients. Table 2 lists treatment-emergent Adverse Reactions (with possible or probable relationship to study drug) occurring in greater than or equal to 1% of adult patients receiving ritonavir in combined Phase II/IV studies.

    The most frequently reported adverse drug reactions among patients receiving ritonavir alone or in combination with other antiretroviral drugs were gastrointestinal (including diarrhea, nausea, vomiting, abdominal pain (upper and lower)), neurological disturbances (including paresthesia and oral paresthesia), rash, and fatigue/asthenia.

    Table 2. Treatment-Emergent Adverse Reactions (With Possible or Probable Relationship to Study Drug) Occurring in greater than or equal to 1% of Adult Patients Receiving Ritonavir in Combined Phase II/IV Studies (N = 1,755)
  • * Represents a medical concept including several similar MedDRA PTs
    		•

    Adverse Reactions

    n

    %

    Eye Disorders

    •   Blurred Vision

    113

    6.4

    Gastrointestinal Disorders

    •   Abdominal Pain (upper and lower)*

    464

    26.4
    •   Diarrhea Including Severe With Electrolyte Imbalance*

    1,192

    67.9
    •   Dyspepsia

    201

    11.5
    •   Flatulence

    142

    8.1
    •   Gastrointestinal Hemorrhage*

    41

    2.3
    •   Gastroesophageal Reflux Disease (GERD)

    19

    1.1
    •   Nausea

    1,007

    57.4
    •   Vomiting*

    559

    31.9

    General Disorders and Administration Site Conditions

    •   Fatigue Including Asthenia*

    811

    46.2

    Hepatobiliary Disorders

    •   Blood Bilirubin Increased (Including Jaundice)*

    25

    1.4
    •   Hepatitis (Including Increased AST, ALT, GGT)*

    153

    8.7

    Immune System Disorders

    •   Hypersensitivity Including Urticaria and Face Edema*

    114

    8.2

    Metabolism and Nutrition Disorders

    •   Edema and Peripheral Edema*

    110

    6.3
    •   Gout*

    24

    1.4
    •   Hypercholesterolemia*

    52

    3.0
    •   Hypertriglyceridemia*

    158

    9.0
    •   Lipodystrophy Acquired*

    51

    2.9

    Musculoskeletal and Connective Tissue Disorders

    •   Arthralgia and Back Pain*

    326

    18.6
    •   Myopathy/Creatine Phosphokinase Increased*

    66

    3.8
    •   Myalgia

    156

    8.9

    Nervous System Disorders

    •   Dizziness*

    274

    15.6
    •   Dysgeusia*

    285

    16.2
    •   Paresthesia (Including Oral Paresthesia)*

    889

    50.7
    •   Peripheral Neuropathy

    178

    10.1
    •   Syncope*

    58

    3.3

    Psychiatric Disorders

    •   Confusion*

    52

    3.0
    •   Disturbance in Attention

    44

    2.5

    Renal and Urinary Disorders

    •   Increased Urination*

    74

    4.2

    Respiratory, Thoracic and Mediastinal Disorders

    •   Coughing*

    380

    21.7
    •   Oropharyngeal Pain*

    279

    15.9

    Skin and Subcutaneous Tissue Disorders

    •   Acne*

    67

    3.8
    •   Pruritus*

    214

    12.2
    •   Rash (Includes Erythematous and Maculopapular)*

    475

    27.1

    Vascular Disorders

    •   Flushing, Feeling Hot*

    232

    13.2
    •   Hypertension*

    58

    3.3
    •   Hypotension Including Orthostatic Hypotension*

    30

    1.7
    •   Peripheral Coldness*

    21

    1.2

    Laboratory Abnormalities in Adults:

    Table 3 shows the percentage of adult patients who developed marked laboratory abnormalities.

    Table 3. Percentage of Adult Patients, by Study and Treatment Group, with Chemistry and Hematology Abnormalities Occurring in greater than 3% of Patients Receiving Ritonavir

    Study 245

    Naive Patients

    Study 247

    Advanced Patients

    Study 462

    PI-Naive Patients

    Variable

    Limit

    Ritonavir plus ZDV

    Ritonavir

    ZDV

    Ritonavir

    Placebo

    Ritonavir plus Saquinavir

    Chemistry

    High

    •   Cholesterol

    >240 mg/dL

    30.7

    44.8

    9.3

    36.5

    8.0

    65.2
    •   CPK

    >1,000 IU/L

    9.6

    12.1

    11.0

    9.1

    6.3

    9.9
    •   GGT

    >300 IU/L

    1.8

    5.2

    1.7

    19.6

    11.3

    9.2
    •   SGOT (AST)

    >180 IU/L

    5.3

    9.5

    2.5

    6.4

    7.0

    7.8
    •   SGPT (ALT)

    >215 IU/L

    5.3

    7.8

    3.4

    8.5

    4.4

    9.2
    •   Triglycerides

    >800 mg/dL

    9.6

    17.2

    3.4

    33.6

    9.4

    23.4
    •   Triglycerides

    >1,500 mg/dL

    1.8

    2.6

    -

    12.6

    0.4

    11.3
    •   Triglycerides Fasting

    >1,500 mg/dL

    1.5

    1.3

    -

    9.9

    0.3

    -
    •   Uric Acid

    >12 mg/dL

    -

    -

    -

    3.8

    0.2

    1.4

    Hematology

    Low

    •   Hematocrit

    <30%

    2.6

    -

    0.8

    17.3

    22.0

    0.7
    •   Hemoglobin

    <8.0 g/dL

    0.9

    -

    -

    3.8

    3.9

    -
    •   Neutrophils

    ≤0.5 x 109/L

    -

    -

    -

    6.0

    8.3

    -
    •   RBC

    <3.0 x 1012/L

    1.8

    -

    5.9

    18.6

    24.4

    -
    •   WBC

    <2.5 x 109/L

    -

    0.9

    6.8

    36.9

    59.4

    3.5

    - Indicates no events reported.

    Adverse Reactions in Pediatric Patients:

    Ritonavir has been studied in 265 pediatric patients greater than 1 month to 21 years of age. The adverse event profile observed during pediatric clinical trials was similar to that for adult patients.

    Vomiting, diarrhea, and skin rash/allergy were the only drug-related clinical adverse events of moderate to severe intensity observed in greater than or equal to 2% of pediatric patients enrolled in ritonavir clinical trials.

    Laboratory Abnormalities in Pediatric Patients:

    The following Grade 3 to 4 laboratory abnormalities occurred in greater than 3% of pediatric patients who received treatment with ritonavir either alone or in combination with reverse transcriptase inhibitors: neutropenia (9%), hyperamylasemia (7%), thrombocytopenia (5%), anemia (4%), and elevated AST (3%).

    6.2 Postmarketing Experience

    The following adverse events (not previously mentioned in the labeling) have been reported during post-marketing use of ritonavir. Because these reactions are reported voluntarily from a population of unknown size, it is not possible to reliably estimate their frequency or establish a causal relationship to ritonavir exposure.

    Body as a Whole: Dehydration, usually associated with gastrointestinal symptoms, and sometimes resulting in hypotension, syncope, or renal insufficiency has been reported. Syncope, orthostatic hypotension, and renal insufficiency have also been reported without known dehydration.

    Co-administration of ritonavir with ergotamine or dihydroergotamine has been associated with acute ergot toxicity characterized by vasospasm and ischemia of the extremities and other tissues including the central nervous system.

    Cardiovascular System: First-degree AV block, second-degree AV block, third-degree AV block, right bundle branch block have been reported [see Warnings and Precautions (5.6)].

    Cardiac and neurologic events have been reported when ritonavir has been co-administered with disopyramide, mexiletine, nefazodone, fluoxetine, and beta blockers. The possibility of drug interaction cannot be excluded.

    Endocrine System: Cushing's syndrome and adrenal suppression have been reported when ritonavir has been co-administered with fluticasone propionate or budesonide.

    Nervous System: There have been postmarketing reports of seizure. Also, see Cardiovascular System.

    Skin and Subcutaneous Tissue Disorders: Toxic epidermal necrolysis (TEN) has been reported.

  • 7 DRUG INTERACTIONS

    When co-administering ritonavir with other protease inhibitors (atazanavir, darunavir, fosamprenavir, saquinavir, and tipranavir), see the full prescribing information for that protease inhibitor including important information for drug interactions.

    7.1 Potential for Ritonavir to Affect Other Drugs

    Ritonavir is an inhibitor of cytochrome P450 3A (CYP3A) and may increase plasma concentrations of agents that are primarily metabolized by CYP3A. Agents that are extensively metabolized by CYP3A and have high first pass metabolism appear to be the most susceptible to large increases in AUC (greater than 3-fold) when co-administered with ritonavir. Thus, co-administration of ritonavir with drugs highly dependent on CYP3A for clearance and for which elevated plasma concentrations are associated with serious and/or life-threatening events is contraindicated. Co-administration with other CYP3A substrates may require a dose adjustment or additional monitoring as shown in Table 4.

    Ritonavir also inhibits CYP2D6 to a lesser extent. Co-administration of substrates of CYP2D6 with ritonavir could result in increases (up to 2-fold) in the AUC of the other agent, possibly requiring a proportional dosage reduction. Ritonavir also appears to induce CYP3A, CYP1A2, CYP2C9, CYP2C19, and CYP2B6 as well as other enzymes, including glucuronosyl transferase.

    These examples are a guide and not considered a comprehensive list of all possible drugs that may interact with ritonavir. The healthcare provider should consult appropriate references for comprehensive information.

    7.2 Established and Other Potentially Significant Drug Interactions

    Table 4 provides a list of established or potentially clinically significant drug interactions. Alteration in dose or regimen may be recommended based on drug interaction studies or predicted interaction [seeContraindications (4), Warnings and Precautions (5.1), and Clinical Pharmacology (12.3)] for magnitude of interaction.

    Table 4. Established and Other Potentially Significant Drug Interactions

    Concomitant Drug Class:

    Drug Name

    Effect on Concentration of Ritonavir or Concomitant Drug

    Clinical Comment

    HIV-Antiviral Agents

    HIV-1 Protease Inhibitor: atazanavir

    darunavir

    fosamprenavir

    ↑ amprenavir

    ↑ atazanavir

    ↑ darunavir

    See the complete prescribing information for fosamprenavir, atazanavir, darunavir for details on co-administration with ritonavir.

    HIV-1 Protease Inhibitor: indinavir

    ↑ indinavir

    Appropriate doses for this combination, with respect to efficacy and safety, have not been established.

    HIV-1 Protease Inhibitor: saquinavir

    ↑ saquinavir

    See the complete prescribing information for saquinavir for details on co-administration of saquinavir and ritonavir.

    Saquinavir/ritonavir in combination with rifampin is not recommended due to the risk of severe hepatotoxicity (presenting as increased hepatic transaminases) if the three drugs are given together.

    HIV-1 Protease Inhibitor: tipranavir

    ↑ tipranavir

    See the complete prescribing information for tipranavir for details on co-administration of tipranavir and ritonavir.

    Non-Nucleoside Reverse Transcriptase Inhibitor: delavirdine

    ↑ ritonavir

    Appropriate doses of this combination with respect to safety and efficacy have not been established.

    HIV-1 CCR5-antagonist: maraviroc

    ↑ maraviroc

    See the complete prescribing information for maraviroc for details on co-administration of maraviroc and ritonavir-containing protease inhibitors.

    Integrase Inhibitor: raltegravir

    ↓ raltegravir

    The effects of ritonavir on raltegravir with ritonavir dosage regimens greater than 100 mg twice daily have not been evaluated, however raltegravir concentrations may be decreased with ritonavir co-administration.

    Other Agents

    Alpha 1-Adrenoreceptor

    Antagonist: alfuzosin

    ↑ alfuzosin

    Contraindicated due to potential hypotension [see

    Contraindications (4)].

    Antianginal: ranolazine

    ↑ ranolazine

    Contraindicated due to potential for serious and/or

    life-threatening reactions [see Contraindications

    (4)].

    Analgesics, Narcotic: tramadol,

    propoxyphene,

    methadone,

    fentanyl

    ↑ analgesics

    ↓ methadone

    ↑ fentanyl

    A dose decrease may be needed for these drugs when co-administered with ritonavir.

    Dosage increase of methadone may be considered.

    Careful monitoring of therapeutic and adverse effects (including potentially fatal respiratory depression) is recommended when fentanyl is concomitantly administered with ritonavir.

    Anesthetic:

    meperidine

    ↓ meperidine/

    ↑ normeperidine (metabolite)

    Dosage increase and long-term use of meperidine with ritonavir are not recommended due to the increased concentrations of the metabolite normeperidine which has both analgesic activity and CNS stimulant activity (e.g., seizures).

    Antialcoholics:

    disulfiram/ metronidazole

    Ritonavir formulations contain ethanol, which can produce disulfiram-like reactions when co-administered with disulfiram or other drugs that produce this reaction (e.g., metronidazole).

    Antiarrhythmics:

    amiodarone,

    dronedarone,

    flecainide,

    propafenone, quinidine

    ↑ antiarrhythmics

    Contraindicated due to potential for cardiac

    arrhythmias [see Contraindications (4)].

    Antiarrhythmics: disopyramide,

    lidocaine, mexiletine

    ↑ antiarrhythmics

    Caution is warranted and therapeutic concentration monitoring is recommended for antiarrhythmics when co-administered with ritonavir, if available.

    Anticancer Agents: abemaciclib,

    apalutamide,

    dasatinib,

    encorafenib,

    ibrutinib,

    ivosidenib,

    neratinib,

    nilotinib,

    venetoclax,

    vinblastine,

    vincristine

    ↑ anticancer agents

    ↓ ritonavir#

    Apalutamide is contraindicated due to potential for loss of virologic response and possible resistance to ritonavir or to the class of protease inhibitors [see Contraindications (4)].

    Avoid co-administration of encorafenib or ivosidenib with ritonavir due to potential risk of serious adverse events such as QT interval prolongation. If co-administration of encorafenib with ritonavir cannot be avoided, modify dose as recommended in encorafenib USPI. If co-administration of ivosidenib with ritonavir cannot be avoided, reduce ivosidenib dose to 250 mg once daily.

    Avoid use of neratinib, venetoclax or ibrutinib with ritonavir.

    For vincristine and vinblastine, consideration should be given to temporarily withholding the ritonavir containing antiretroviral regimen in patients who develop significant hematologic or gastrointestinal side effects when ritonavir is administered concurrently with vincristine or vinblastine.

    Clinicians should be aware that if the ritonavir containing regimen is withheld for a prolonged period, consideration should be given to altering the regimen to not include a CYP3A or P-gp inhibitor in order to control HIV-1 viral load.

    A decrease in the dosage or an adjustment of the dosing interval of nilotinib and dasatinib may be necessary for patients requiring co-administration with strong CYP3A inhibitors such as ritonavir. Please refer to the nilotinib and dasatinib prescribing information for dosing instructions.

    Anticoagulant:

    warfarin

    ↑↓ warfarin

    Initial frequent monitoring of the INR during ritonavir and warfarin co-administration is recommended.

    Anticoagulant:

    rivaroxaban

    ↑ rivaroxaban

    Avoid concomitant use of rivaroxaban and ritonavir. Co-administration of ritonavir and rivaroxaban may lead to risk of increased bleeding.

    Anticonvulsants: carbamazepine,

    clonazepam,

    ethosuximide

    ↑ anticonvulsants

    A dose decrease may be needed for these drugs when co-administered with ritonavir and therapeutic concentration monitoring is recommended for these anticonvulsants, if available.

    Anticonvulsants:

    divalproex,

    lamotrigine,

    phenytoin

    ↓ anticonvulsants

    A dose increase may be needed for these drugs when co-administered with ritonavir and therapeutic concentration monitoring is recommended for these anticonvulsants, if available.

    Antidepressants:

    nefazodone,

    selective serotonin

    reuptake inhibitors

    (SSRIs): e.g.

    fluoxetine,

    paroxetine,

    tricyclics: e.g. amitriptyline,

    nortriptyline

    ↑ antidepressants

    A dose decrease may be needed for these drugs when co-administered with ritonavir.

    Antidepressant:

    bupropion

    ↓ bupropion

    ↓ active metabolite, hydroxybupropion

    Patients receiving ritonavir and bupropion concurrently should be monitored for an adequate clinical response to bupropion.

    Antidepressant:

    desipramine

    ↑ desipramine

    Dosage reduction and concentration monitoring of desipramine is recommended.

    Antidepressant:

    trazodone

    ↑ trazodone

    Adverse events of nausea, dizziness, hypotension and syncope have been observed following co-administration of trazodone and ritonavir. A lower dose of trazodone should be considered.

    Antiemetic:

    dronabinol

    ↑ dronabinol

    A dose decrease of dronabinol may be needed when co-administered with ritonavir.

    Antifungals:

    ketoconazole

    itraconazole

    voriconazole

    ↑ ketoconazole

    ↑ itraconazole

    ↓ voriconazole

    High doses of ketoconazole or itraconazole (greater than 200 mg per day) are not recommended.

    Co-administration of voriconazole and ritonavir doses of 400 mg every 12 hours or greater is contraindicated due to the potential for loss of antifungal response [see Contraindications (4)]. Co-administration of voriconazole and ritonavir 100 mg should be avoided, unless an assessment of the benefit/risk to the patient justifies the use of voriconazole.

    Anti-gout:

    colchicine

    ↑ colchicine

    Contraindicated due to potential for serious and/or

    life-threatening reactions in patients with renal and/or hepatic impairment [see Contraindications (4)].

    For patients with normal renal or hepatic function:

    Treatment of gout flares-co-administration of colchicine in patients on ritonavir: 0.6 mg (one tablet) for one dose, followed by 0.3 mg (half tablet) one hour later. Dose to be repeated no earlier than three days.

    Prophylaxis of gout flares-co-administration of colchicine in patients on ritonavir: If the original colchicine regimen was 0.6 mg twice a day, the regimen should be adjusted to 0.3 mg once a day.

    If the original colchicine regimen was 0.6 mg once a day, the regimen should be adjusted to 0.3 mg once every other day.

    Treatment of familial Mediterranean fever (FMF)-co-administration of colchicine in patients on ritonavir: Maximum daily dose of 0.6 mg (may be given as 0.3 mg twice a day).

    Anti-infective: clarithromycin

    ↑ clarithromycin

    For patients with renal impairment, adjust clarithromycin dose as follows:

    •   For patients with CLCR 30 to 60 mL per min the dose of clarithromycin should be reduced by 50%.
    •   For patients with CLCR less than 30 mL per min the dose of clarithromycin should be decreased by 75%.

    No dose adjustment for patients with normal renal function is necessary.

    Antimycobacterial:

    bedaquiline

    ↑ bedaquiline

    Bedaquiline should only be used with ritonavir if the benefit of co-administration outweighs the risk.

    Antimycobacterial:

    rifabutin

    ↑ rifabutin and rifabutin metabolite

    Dosage reduction of rifabutin by at least three-quarters of the usual dose of 300 mg per day is recommended (e.g., 150 mg every other day or three times a week). Further dosage reduction may be necessary.

    Antimycobacterial:

    rifampin

    ↓ ritonavir

    May lead to loss of virologic response. Alternate antimycobacterial agents such as rifabutin should be considered.

    Antiparasitic:

    atovaquone

    ↓ atovaquone

    Clinical significance is unknown; however, increase in atovaquone dose may be needed.

    Antiparasitic:

    quinine

    ↑ quinine

    A dose decrease of quinine may be needed when co-administered with ritonavir.

    Antipsychotics:

    lurasidone

    pimozide

    ↑ lurasidone

    ↑ pimozide

    Contraindicated due to potential for serious and/or

    life-threatening reactions [see Contraindications

    (4)].

    Contraindicated due to potential for serious and/or

    life-threatening reactions such as cardiac

    arrhythmias [see Contraindications (4)].

    Antipsychotics:

    perphenazine, risperidone, thioridazine

    ↑ antipsychotics

    A dose decrease may be needed for these drugs when co-administered with ritonavir.

    Antipsychotics:

    quetiapine

    ↑ quetiapine

    Initiation of ritonavir in patients taking quetiapine:

    Consider alternative antiretroviral therapy to avoid increases in quetiapine exposures. If co-administration is necessary, reduce the quetiapine dose to 1/6 of the current dose and monitor for quetiapine-associated adverse reactions. Refer to the quetiapine prescribing information for recommendations on adverse reaction monitoring.

    Initiation of quetiapine in patients taking ritonavir:

    Refer to the quetiapine prescribing information for initial dosing and titration of quetiapine.

    β-Blockers:

    metoprolol,

    timolol

    ↑ beta-blockers

    Caution is warranted and clinical monitoring of patients is recommended. A dose decrease may be needed for these drugs when co-administered with ritonavir.

    Bronchodilator:

    theophylline

    ↓ theophylline

    Increased dosage of theophylline may be required; therapeutic monitoring should be considered.

    Calcium Channel Blockers:

    diltiazem,

    nifedipine,

    verapamil

    ↑ calcium channel blockers

    Caution is warranted and clinical monitoring of patients is recommended. A dose decrease may be needed for these drugs when co-administered with ritonavir.

    Digoxin

    ↑ digoxin

    Concomitant administration of ritonavir with digoxin may increase digoxin levels. Caution should be exercised when co-administering ritonavir with digoxin, with appropriate monitoring of serum digoxin levels.

    Endothelin Receptor Antagonists:

    bosentan

    ↑ bosentan

    Co-administration of bosentan in patients on ritonavir:

    In patients who have been receiving ritonavir for at least 10 days, start bosentan at 62.5 mg once daily or every other day based upon individual tolerability.

    Co-administration of ritonavir in patients on bosentan:

    Discontinue use of bosentan at least 36 hours prior to initiation of ritonavir.

    After at least 10 days following the initiation of ritonavir, resume bosentan at 62.5 mg once daily or every other day based upon individual tolerability.

    GnRH Receptor Antagonists:

    elagolix

    ↑ elagolix

    ↓ ritonavir

    Concomitant use of elagolix 200 mg twice daily and ritonavir for more than 1 month is not recommended due to potential risk of adverse events such as bone loss and hepatic transaminase elevations. Limit concomitant use of elagolix 150 mg once daily and ritonavir to 6 months.

    Ergot Derivatives:

    dihydroergotamine,

    ergotamine,

    methylergonovine

    ↑ ergot derivatives

    Contraindicated due to potential for acute ergot toxicity characterized by vasospasm and ischemia of the extremities and other tissues including the central nervous system [see Contraindications (4)].

    GI Motility Agent:

    cisapride

    ↑ cisapride

    Contraindicated due to potential for cardiac arrhythmias [see Contraindications (4)].

    Hepatitis C direct acting antiviral: glecaprevir/pibrentasvir

    simeprevir

    ↑ glecaprevir

    ↑ pibrentasvir

    ↑ simeprevir

    It is not recommended to co-administer ritonavir with glecaprevir/pibrentasvir, or simeprevir.

    Herbal Products:

    St. John's Wort (hypericum perforatum)

    ↓ ritonavir

    Contraindicated due to potential for loss of virologic response and possible resistance to ritonavir or to the class of protease inhibitors [see Contraindications (4)].

    Lipid-modifying agents

    HMG-CoA Reductase Inhibitor:

    lovastatin

    simvastatin

    atorvastatin

    rosuvastatin

    Microsomal triglyceride transfer protein (MTTP)

    Inhibitor:

    lomitapide

    ↑ lovastatin

    ↑ simvastatin

    ↑ atorvastatin

    ↑ rosuvastatin

    ↑ lomitapide

    Contraindicated due to potential for myopathy including rhabdomyolysis [see Contraindications (4)].

    Titrate atorvastatin and rosuvastatin dose carefully and use the lowest necessary dose.

    If ritonavir is used with another protease inhibitor, see the complete prescribing information for the concomitant protease inhibitor for details on co-administration with atorvastatin and rosuvastatin.

    Lomitapide is a sensitive substrate for CYP3A4 metabolism. CYP3A4 inhibitors increase the exposure of lomitapide, with strong inhibitors increasing exposure approximately 27-fold.

    Concomitant use of moderate or strong CYP3A4 inhibitors with lomitapide is contraindicated due to potential for hepatotoxicity [see Contraindications (4)].

    Immunosuppressants: cyclosporine,

    tacrolimus,

    sirolimus

    (rapamycin)

    ↑ immunosuppressants

    Therapeutic concentration monitoring is recommended for immunosuppressant agents when co-administered with ritonavir.

    Kinase Inhibitors:

    fostamatinib (also see anticancer agents above)

    ↑ fostamatinib

    metabolite R406

    Monitor for toxicities of R406 exposure resulting in dose-related adverse events such as hepatotoxicity and neutropenia. Fostamatinib dose reduction may be required.

    Long-acting beta-adrenoceptor agonist: salmeterol

    ↑ salmeterol

    Concurrent administration of salmeterol and ritonavir is not recommended. The combination may result in increased risk of cardiovascular adverse events associated with salmeterol, including QT prolongation, palpitations and sinus tachycardia.

    Oral Contraceptives or Patch Contraceptives:

    ethinyl estradiol

    ↓ ethinyl estradiol

    Alternate methods of contraception should be considered.

    PDE5 Inhibitors:

    avanafil

    sildenafil,

    tadalafil,

    vardenafil

    ↑ avanafil

    ↑ sildenafil

    ↑ tadalafil

    ↑ vardenafil

    Sildenafil when used for the treatment of pulmonary arterial hypertension (Revatio®) is contraindicated due to the potential for sildenafil‑associated adverse events, including visual abnormalities, hypotension, prolonged erection, and

    syncope [see Contraindications (4)].

    Do not use ritonavir with avanafil because a safe and effective avanafil dosage regimen has not been established.

    Particular caution should be used when prescribing sildenafil, tadalafil or vardenafil in patients receiving ritonavir.

    Co-administration of ritonavir with these drugs may result in an increase in PDE5 inhibitor associated adverse events, including hypotension, syncope, visual changes, and prolonged erection.

    Use of PDE5 inhibitors for pulmonary arterial hypertension (PAH):

    Sildenafil (Revatio®) is contraindicated [see Contraindications (4)].

    The following dose adjustments are recommended for use of tadalafil (Adcirca®) with ritonavir:

    Co-administration of ADCIRCA in patients on ritonavir:

    In patients receiving ritonavir for at least one week, start ADCIRCA at 20 mg once daily. Increase to 40 mg once daily based upon individual tolerability.

    Co-administration of ritonavir in patients on ADCIRCA:

    Avoid use of ADCIRCA during the initiation of ritonavir. Stop ADCIRCA at least 24 hours prior to starting ritonavir. After at least one week following the initiation of ritonavir, resume ADCIRCA at 20 mg once daily. Increase to 40 mg once daily based upon individual tolerability.

    Use of PDE5 inhibitors for the treatment of erectile dysfunction:

    It is recommended not to exceed the following doses:

    • Sildenafil: 25 mg every 48 hours
    • Tadalafil: 10 mg every 72 hours
    • Vardenafil: 2.5 mg every 72 hours

    Use with increased monitoring for adverse events.

    Sedative/hypnotics: buspirone, clorazepate,

    diazepam, estazolam,

    flurazepam, zolpidem

    ↑ sedative/hypnotics

    A dose decrease may be needed for these drugs when co-administered with ritonavir.

    Sedative/Hypnotics:

    triazolam, orally administered midazolam

    ↑ triazolam

    ↑ midazolam

    Contraindicated due to potential for prolonged or increased sedation or respiratory depression [see Contraindications (4)].

    Sedative/hypnotics:

    Parenteral midazolam

    ↑ midazolam

    Co-administration should be done in a setting which ensures close clinical monitoring and appropriate medical management in case of respiratory depression and/or prolonged sedation. Dosage reduction for midazolam should be considered, especially if more than a single dose of midazolam is administered.

    Stimulant: methamphetamine

    ↑ methamphetamine

    Use with caution. A dose decrease of methamphetamine may be needed when co-administered with ritonavir.

    Systemic/Inhaled/

    Nasal/Ophthalmic

    Corticosteroids:

    e.g., betamethasone

    budesonide

    ciclesonide

    dexamethasone

    fluticasone

    methylprednisolone

    mometasone

    prednisone

    triamcinolone

    ↑ glucocorticoids

    Coadministration with corticosteroids whose exposures are significantly increased by strong CYP3A inhibitors can increase the risk for Cushing’s syndrome and adrenal suppression.

    Alternative corticosteroids including beclomethasone and prednisolone (whose PK and/or PD are less affected by strong CYP3A inhibitors relative to other studied steroids) should be considered, particularly for long-term use.

    #refers to interaction with apalutamide.

  • 8 USE IN SPECIFIC POPULATIONS

    When co-administering ritonavir with other protease inhibitors, see the full prescribing information for the co-administered protease inhibitor including important information for use in special populations.

    8.1 Pregnancy

    Pregnancy Exposure Registry:

    There is a pregnancy exposure registry that monitors pregnancy outcomes in women exposed to ritonavir during pregnancy. Healthcare providers are encouraged to register patients by calling the Antiretroviral Pregnancy Registry (APR) at 1–800–258–4263.

    Risk Summary:

    Prospective pregnancy data from the Antiretroviral Pregnancy Registry (APR) are not sufficient to adequately assess the risk of birth defects or miscarriage. Available data from the APR show no difference in the rate of overall birth defects for ritonavir compared to the background rate for major birth defects of 2.7% in the U.S. reference population of the Metropolitan Atlanta Congenital Defects Program (MACDP) [see Data].

    In animal reproduction studies, no evidence of adverse developmental outcomes was observed with oral administration of ritonavir to pregnant rats and rabbits. During organogenesis in the rat and rabbit, systemic exposure (AUC) was approximately 1/3 lower than human exposure at the recommended daily dose. In the rat pre- and post-natal developmental study, maternal systemic exposure to ritonavir was approximately 1/2 of the exposure in humans at the recommended daily dose, based on a body surface area conversion factor [see Data].

    Ritonavir oral solution is not recommended during pregnancy because there is no known safe level of ethanol exposure during pregnancy [see Clinical Considerations, Dosage and Administration (2.3) and Warnings and Precautions (5.2)].

    The background risk of major birth defects and miscarriage for the indicated population is unknown. All pregnancies have a background risk of birth defect, loss, or other adverse outcomes. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2 to 4% and 15 to 20%, respectively.

    Clinical Considerations:

    Dose Adjustments During Pregnancy and the Postpartum Period: Ritonavir oral solution contains approx. 43% ethanol (v/v) and approx. 27% (w/v) propylene glycol and is not recommended during pregnancy because there is no known safe level of ethanol exposure during pregnancy [see Dosage and Administration (2.3) and Warnings and Precautions (5.2)].

    Data:

    Human Data: Based on prospective reports to the APR of approximately 6,100 live births following exposure to ritonavir-containing regimens (including over 2,800 live births exposed in the first trimester and over 3,200 live births exposed in the second and third trimesters), there was no difference in the rate of overall birth defects for ritonavir compared with the background birth defect rate of 2.7% in the U.S. reference population of the MACDP. The prevalence of birth defects in live births was 2.3% (95% CI: 1.7% to 2.9%) following first-trimester exposure to ritonavir-containing regimens and 2.9% (95% CI: 2.3% to 3.5%) following second and third trimester exposure to ritonavir-containing regimens.

    While placental transfer of ritonavir and fetal ritonavir concentrations are generally low, detectable levels have been observed in cord blood samples and neonate hair.

    Animal Data: Ritonavir was administered orally to pregnant rats (at 0, 15, 35, and 75 mg/kg/day) and rabbits (at 0, 25, 50, and 110 mg/kg/day) during organogenesis (on gestation days 6 through 17 and 6 through 19, respectively). No evidence of teratogenicity due to ritonavir was observed in rats and rabbits at doses producing systemic exposures (AUC) equivalent to approximately 1/3 lower than human exposure at the recommended daily dose. Developmental toxicity observed in rats (early resorptions, decreased fetal body weight and ossification delays and developmental variations) occurred at a maternally toxic dose, at an exposure equivalent to approximately 1/3 lower than human exposure at the recommended daily dose. A slight increase in the incidence of cryptorchidism was also noted in rats (at a maternally toxic dose) at an exposure approximately 1/5 lower than human exposure at the recommended daily dose. Developmental toxicity was observed in rabbits (resorptions, decreased litter size and decreased fetal weights) at maternally toxic doses approximately 1.8 times higher than the recommended daily dose, based on a body surface area conversion factor. In pre-and postnatal development study in rats, ritonavir was administered at doses of 0, 15, 35, and 60 mg/kg/day from gestation day 6 through postnatal day 20. At doses of 60 mg/kg/day, no developmental toxicity was noted with ritonavir dosage equivalent to 1/2 of the recommended daily dose, based on a body surface area conversion factor.

    8.2 Lactation

    Risk Summary:

    The Centers for Disease Control and Prevention recommend that HIV-infected mothers not breastfeed their infants to avoid risking postnatal transmission of HIV.

    Limited published data reports that ritonavir is present in human milk.

    There is no information on the effects of ritonavir on the breastfed infant or the effects of the drug on milk production. Because of the potential for (1) HIV transmission (in HIV-negative infants), (2) developing viral resistance (in HIV-positive infants) and (3) serious adverse reactions in a breastfed infant, instruct mothers not to breastfeed if they are receiving ritonavir.

    8.3 Females and Males of Reproductive Potential

    Contraception:

    Use of ritonavir may reduce the efficacy of combined hormonal contraceptives. Advise patients using combined hormonal contraceptives to use an effective alternative contraceptive method or an additional barrier method of contraception [see Drug Interactions (7.2)].

    8.4 Pediatric Use

    In HIV-infected patients age greater than 1 month to 21 years, the antiviral activity and adverse event profile seen during clinical trials and through postmarketing experience were similar to that for adult patients.

    8.5 Geriatric Use

    Clinical studies of ritonavir did not include sufficient numbers of subjects aged 65 and over to determine whether they respond differently from younger subjects. In general, dose selection for an elderly patient should be cautious, usually starting at the low end of the dosing range, reflecting the greater frequency of decreased hepatic, renal or cardiac function, and of concomitant disease or other drug therapy.

    8.6 Hepatic Impairment

    No dose adjustment of ritonavir is necessary for patients with either mild (Child-Pugh Class A) or moderate (Child-Pugh Class B) hepatic impairment. No pharmacokinetic or safety data are available regarding the use of ritonavir in subjects with severe hepatic impairment (Child-Pugh Class C), therefore, ritonavir is not recommended for use in patients with severe hepatic impairment [see Warnings and Precautions (5.3), Clinical Pharmacology (12.3)].

  • 10 OVERDOSAGE

    Acute Overdosage - Human Overdose Experience:

    Human experience of acute overdose with ritonavir is limited. One patient in clinical trials took ritonavir 1,500 mg per day for two days. The patient reported paresthesias which resolved after the dose was decreased. A post-marketing case of renal failure with eosinophilia has been reported with ritonavir overdose.

    The approximate lethal dose was found to be greater than 20 times the related human dose in rats and 10 times the related human dose in mice.

    Management of Overdosage:

    Ritonavir oral solution contains approx. 43% ethanol (v/v) and approx. 27% (w/v) propylene glycol. Ingestion of the product over the recommended dose by a young child could result in significant toxicity and could potentially be lethal.

    Treatment of overdose with ritonavir consists of general supportive measures including monitoring of vital signs and observation of the clinical status of the patient. There is no specific antidote for overdose with ritonavir. If indicated, elimination of unabsorbed drug should be achieved by gastric lavage; usual precautions should be observed to maintain the airway. Administration of activated charcoal may also be used to aid in removal of unabsorbed drug. Since ritonavir is extensively metabolized by the liver and is highly protein bound, dialysis is unlikely to be beneficial in significant removal of the drug. However, dialysis can remove both ethanol and propylene glycol in the case of overdose with ritonavir oral solution. A Certified Poison Control Center should be consulted for up-to-date information on the management of overdose with ritonavir.

  • 11 DESCRIPTION

    Ritonavir is an inhibitor of HIV protease with activity against the Human Immunodeficiency Virus (HIV).

    Ritonavir is chemically designated as 2,4,7,12-Tetraazatridecan-13-oic acid, 10-hydroxy-2-methyl-5-(1-methylethyl)-1-[2-(1-methylethyl)-4-thiazolyl]-3,6-dioxo-8,11-bis(phenylmethyl)-5-thiazolylmethyl ester, [5S-(5R*,8R*,10R*,11R*)]. Its molecular formula is C37H48N6O5S2, and its molecular weight is 720.94. Ritonavir has the following structural formula:

    •  
      chem-ritonavir-black.jpg

    Ritonavir USP is a white to almost white powder. It is freely soluble in methanol and in methylene chloride, very slightly soluble in acetonitrile, practically insoluble in water.

    Ritonavir Tablets USP are available for oral administration containing 100 mg ritonavir USP and the following inactive ingredients: anhydrous dibasic calcium phosphate, colloidal silicon dioxide, copovidone, hypromellose, isopropyl alcohol, polysorbate 80, polyethylene glycol, purified water, sodium stearyl fumarate, sorbitan monolaurate, and titanium dioxide.

  • 12 CLINICAL PHARMACOLOGY

    12.1 Mechanism of Action

    Ritonavir is an antiretroviral drug [see Microbiology (12.4)].

    12.2 Pharmacodynamics

    Cardiac Electrophysiology:

    QTcF interval was evaluated in a randomized, placebo and active (moxifloxacin 400 mg once-daily) controlled crossover study in 45 healthy adults, with 10 measurements over 12 hours on Day 3. The maximum mean (95% upper confidence bound) time-matched difference in QTcF from placebo after baseline correction was 5.5 (7.6) milliseconds (msec) for 400 mg twice-daily ritonavir. Ritonavir 400 mg twice daily resulted in Day 3 ritonavir exposure that was approximately 1.5 fold higher than observed with ritonavir 600 mg twice-daily dose at steady state.

    PR interval prolongation was also noted in subjects receiving ritonavir in the same study on Day 3. The maximum mean (95% confidence interval) difference from placebo in the PR interval after baseline correction was 22 (25) msec for 400 mg twice-daily ritonavir [see Warnings and Precautions (5.6)].

    12.3 Pharmacokinetics

    The pharmacokinetics of ritonavir have been studied in healthy volunteers and HIV-infected patients (CD4 greater than or equal to 50 cells per µL). See Table 5 for ritonavir pharmacokinetic characteristics.

    Absorption:

    The absolute bioavailability of ritonavir has not been determined. After a 600 mg dose of oral solution, peak concentrations of ritonavir were achieved approximately 2 hours and 4 hours after dosing under fasting and non-fasting (514 KCal; 9% fat, 12% protein, and 79% carbohydrate) conditions, respectively.

    Ritonavir tablets are not bioequivalent to ritonavir capsules. Under moderate fat conditions (857 kcal; 31% fat, 13% protein, 56% carbohydrates), when a single 100 mg ritonavir dose was administered as a tablet compared with a capsule, AUC(0-∞) met equivalence criteria but mean Cmax was increased by 26% (92.8% confidence intervals: ↑15 to ↑39%).

    No information is available comparing ritonavir tablets to ritonavir capsules under fasting conditions.

    After administration of a single 100 mg dose under fed conditions (617 Kcal, 29% calories from fat), ritonavir oral powder demonstrated comparable bioavailability to the oral solution.

    Effect of Food on Oral Absorption: The bioavailability of ritonavir tablet, oral solution, and oral powder is decreased under fed conditions as compared to fasted conditions.

    Following the administration of a 100 mg tablet dose of ritonavir, Cmax and AUCinf of ritonavir were decreased by 21 to 23% under moderate fat (857 Kcal, 30% from fat) or high fat conditions (917 Kcal, 60% calories from fat) relative to fasting conditions.

    Following the administration of a 600 mg dose ritonavir oral solution, Cmax and AUCinf of ritonavir were decreased by 23% and 7%, respectively, under nonfasting conditions (514 Kcal, 10% from fat) relative to fasting conditions. Dilution of the oral solution, within one hour of administration, with 240 mL of chocolate milk, Advera® or Ensure® did not significantly affect the extent and rate of ritonavir absorption.

    Following the administration of a 100 mg dose of ritonavir oral powder, Cmax and AUCinf of ritonavir were decreased by 23 to 49% under moderate fat (617 Kcal, 29% calories from fat) or high fat conditions (917 Kcal, 60% calories from fat) relative to fasting conditions.

    Metabolism:

    Nearly all of the plasma radioactivity after a single oral 600 mg dose of 14C-ritonavir oral solution (n=5) was attributed to unchanged ritonavir. Five ritonavir metabolites have been identified in human urine and feces. The isopropylthiazole oxidation metabolite (M-2) is the major metabolite and has antiviral activity similar to that of parent drug; however, the concentrations of this metabolite in plasma are low. In vitro studies utilizing human liver microsomes have demonstrated that cytochrome P450 3A (CYP3A) is the major isoform involved in ritonavir metabolism, although CYP2D6 also contributes to the formation of M–2.

    Elimination:

    In a study of five subjects receiving a 600 mg dose of 14C-ritonavir oral solution, 11.3 ± 2.8% of the dose was excreted into the urine, with 3.5 ± 1.8% of the dose excreted as unchanged parent drug. In that study, 86.4 ± 2.9% of the dose was excreted in the feces with 33.8 ± 10.8% of the dose excreted as unchanged parent drug. Upon multiple dosing, ritonavir accumulation is less than predicted from a single dose possibly due to a time and dose-related increase in clearance.

    Table 5. Ritonavir Pharmacokinetic Characteristics
  • * Single ritonavir 600 mg dose.
  • † SS = steady state; patients taking ritonavir 600 mg q12h.
  • ‡ Primarily bound to human serum albumin and alpha-1 acid glycoprotein over the ritonavir concentration range of 0.01 to 30 µg/mL.
    		•

    Parameter

    N

    Values (Mean ± SD)

    Vβ/F*

    91

    0.41 ± 0.25 L/kg

    t1/2

    3 to 5h

    CL/F SS†

    10

    8.8 ± 3.2 L/h

    CL/F*

    91

    4.6 ± 1.6 L/h

    CLR

    62

    <0.1 L/h

    RBC/Plasma Ratio

    0.14

    Percent Bound‡

    98 to 99%

    Special Populations:

    Gender, Race and Age: No age-related pharmacokinetic differences have been observed in adult patients (18 to 63 years). Ritonavir pharmacokinetics have not been studied in older patients.

    A study of ritonavir pharmacokinetics in healthy males and females showed no statistically significant differences in the pharmacokinetics of ritonavir. Pharmacokinetic differences due to race have not been identified.

    Pediatric Patients: Steady-state pharmacokinetics were evaluated in 37 HIV-infected patients ages 2 to 14 years receiving doses ranging from 250 mg per m2 twice-daily to 400 mg per m2 twice-daily in PACTG Study 310, and in 41 HIV-infected patients ages 1 month to 2 years at doses of 350 and 450 mg per m2 twice-daily in PACTG Study 345. Across dose groups, ritonavir steady-state oral clearance (CL/F/m2) was approximately 1.5 to 1.7 times faster in pediatric patients than in adult subjects. Ritonavir concentrations obtained after 350 to 400 mg per m2 twice-daily in pediatric patients greater than 2 years were comparable to those obtained in adults receiving 600 mg (approximately 330 mg per m2) twice-daily. The following observations were seen regarding ritonavir concentrations after administration with 350 or 450 mg per m2 twice-daily in children less than 2 years of age. Higher ritonavir exposures were not evident with 450 mg per m2 twice-daily compared to the 350 mg per m2 twice-daily. Ritonavir trough concentrations were somewhat lower than those obtained in adults receiving 600 mg twice-daily. The area under the ritonavir plasma concentration time curve and trough concentrations obtained after administration with 350 or 450 mg per m2 twice-daily in children less than 2 years were approximately 16% and 60% lower, respectively, than that obtained in adults receiving 600 mg twice daily.

    Renal Impairment: Ritonavir pharmacokinetics have not been studied in patients with renal impairment, however, since renal clearance is negligible, a decrease in total body clearance is not expected in patients with renal impairment.

    Hepatic Impairment: Dose-normalized steady-state ritonavir concentrations in subjects with mild hepatic impairment (400 mg twice-daily, n=6) were similar to those in control subjects dosed with 500 mg twice-daily. Dose-normalized steady-state ritonavir exposures in subjects with moderate hepatic impairment (400 mg twice-daily, n=6) were about 40% lower than those in subjects with normal hepatic function (500 mg twice-daily, n=6). Protein binding of ritonavir was not statistically significantly affected by mild or moderately impaired hepatic function. No dose adjustment is recommended in patients with mild or moderate hepatic impairment. However, health care providers should be aware of the potential for lower ritonavir concentrations in patients with moderate hepatic impairment and should monitor patient response carefully. Ritonavir has not been studied in patients with severe hepatic impairment.

    Pregnancy: Based on evaluation of the published literature, ritonavir exposures are reduced during pregnancy relative to postpartum.

    Drug Interactions:

    [see also Contraindications (4), Warnings and Precautions (5.1), and Drug Interactions (7)].

    Table 6 and Table 7 summarize the effects on AUC and Cmax, with 95% confidence intervals (95% CI), of co-administration of ritonavir with a variety of drugs. For information about clinical recommendations see Table 4 in Drug Interactions (7).

    Table 6. Drug Interactions - Pharmacokinetic Parameters for Ritonavir in the Presence of the Co-administered Drug

  • * Parallel group design; entries are subjects receiving combination and control regimens, respectively.
    		•

    Co-administered Drug

    Dose of Co-administered Drug (mg)

    Dose of Ritonavir (mg)

    N

    AUC % (95% CI)

    Cmax

    (95% CI)

    Cmin

    (95% CI)

    Clarithromycin

    500 q12h, 4 d

    200 q8h, 4 d

    22

    ￪ 12%

    (2, 23%)

    ￪ 15%

    (2, 28%)

    ￪14%

    (-3, 36%)

    Didanosine

    200 q12h, 4 d

    600 q12h, 4 d

    12

    ↔

    ↔

    ↔

    Fluconazole

    400 single dose, day 1; 200 daily, 4 d

    200 q6h, 4 d

    8

    ￪ 12%

    (5, 20%)

    ￪ 15%
    (7, 22%)

    ￪ 14%
    (0, 26%)

    Fluoxetine

    30 q12h, 8 d

    600 single dose,

    1 d

    16

    ￪ 19%

    (7, 34%)

    ↔

    ND

    Ketoconazole

    200 daily, 7 d

    500 q12h, 10 d

    12

    ￪ 18%

    (-3, 52%)

    ￪ 10%

    (-11, 36%)

    ND

    Rifampin

    600 or 300 daily, 10 d

    500 q12h, 20 d

    7,

    9*

    ￬ 35%

    (7, 55%)

    ￬ 25%

    (-5, 46%)

    ￬ 49%

    (-14, 91%)

    Voriconazole

    400 q12h, 1 d; then 200 q12h, 8 d

    400 q12h, 9 d

    ↔

    ↔

    ND

    Zidovudine

    200 q8h, 4 d

    300 q6h, 4 d

    10

    ↔

    ↔

    ↔

    ND = not determined

    Table 7. Drug Interactions - Pharmacokinetic Parameters for Co-administered Drug in the Presence of Ritonavir

  • * For the reference arm: n=14 for Cmax and AUC(0-inf), and for the test arm: n=13 for Cmax and n=4 for AUC(0-inf).
  • † This significant increase in plasma fluticasone propionate exposure resulted in a significant decrease (86%) in plasma cortisol AUC.
  • ‡ Ritonavir and indinavir were co-administered for 15 days; Day 14 doses were administered after a 15%-fat breakfast (757 Kcal) and 9%-fat evening snack (236 Kcal), and Day 15 doses were administered after a 15%-fat breakfast (757 Kcal) and 32%-fat dinner (815 Kcal). Indinavir Cmin was also increased 4-fold. Effects were assessed relative to an indinavir 800 mg q8h regimen under fasting conditions.
  • § Effects were assessed on a dose-normalized comparison to a methadone 20 mg single dose.
  • 90% CI presented for rivaroxaban
  • # Parallel group design; entries are subjects receiving combination and control regimens, respectively.
  • Þ 90% CI presented for simeprevir (change in exposure presented as percentage increase)
  • ß Sulfamethoxazole and trimethoprim taken as single combination tablet.
  • à 90% CI presented for R- and S-warfarin AUC and Cmax ratios.
    ↑ Indicates increase, ↓ indicates decrease, ↔ indicates no change.
    ND = not determined
    		•

    Co-administered Drug

    •   Dose of
    •   Co-administered Drug (mg)

    Dose of Ritonavir (mg)

    N

    AUC %

    (95% CI)

    Cmax

    (95% CI)

    Cmin

    (95% CI)

    Alprazolam

    1, single dose

    500 q12h,

    10 d

    12

    ￬ 12%

    (-5, 30%)

    ￬ 16%

    (5, 27%)

    ND

    Avanafil

    50, single dose

    600 q12h

    14*

    ￪ 13-fold

    ￪ 2.4-fold

    ND

    Clarithromycin

    500 q12h,

    4 d

    200 q8h,

    4 d

    22

    ￪ 77%

    (56, 103%)

    ￪ 31%

    (15, 51%)

    ￪ 2.8-fold

    (2.4, 3.3X)

    14-OH clarithromycin metabolite

    ￬ 100%

    ￬ 99%

    ￬ 100%

    Desipramine

    100, single dose

    500 q12h,

    12 d

    14

    ￪ 145%

    (103, 211%)

    ￪ 22%

    (12, 35%)

    ND

    2-OH desipramine metabolite

    ￬ 15%

    (3, 26%)

    ￬ 67%

    (62, 72%)

    ND

    Didanosine

    200 q12h,

    4 d

    600 q12h,

    4 d

    12

    ￬ 13%

    (0, 23%)

    ￬ 16%

    (5, 26%)

    ↔

    Ethinyl estradiol

    50 µg single dose

    500 q12h,

    16 d

    23

    ￬ 40%

    (31, 49%)

    ￬ 32%

    (24, 39%)

    ND

    Fluticasone propionate aqueous nasal spray

    200 mcg qd, 7 d

    100 mg q12h, 7 d

    18

    ￪ approximately 350-fold†

    ￪ approximately

    25-fold†

    Indinavir‡

    Day 14

    400 q12h, 15 d

    400 q12h,

    15 d

    10

    ￪ 6%

    (-14, 29%)

    ￬ 51%

    (40, 61%)

    ￪ 4-fold

    (2.8, 6.8x)

    Day 15

    ￬ 7%

    (-22, 28%)

    ￬ 62%

    (52, 70%)

    ￪ 4-fold

    (2.5, 6.5x)

    Ketoconazole

    200 daily,

    7 d

    500 q12h,

    10 d

    12

    ￪ 3.4-fold

    (2.8, 4.3x)

    ￪ 55%

    (40, 72%)

    ND

    Meperidine

    50 oral single dose

    500 q12h,

    10 d

    8

    ￬ 62%

    (59, 65%)

    ￬ 59%

    (42, 72%)

    ND

    Normeperidine metabolite

    6

    ￪ 47%

    (-24, 345%)

    ￪ 87%

    (42, 147%)

    ND

    Methadone§

    5, single dose

    500 q12h,

    15 d

    11

    ￬ 36%

    (16, 52%)

    ￬ 38%

    (28, 46%)

    ND

    Raltegravir

    400, single dose

    100 q12h,

    16 d

    10

    ￬ 16%

    (-30, 1%)

    ￬ 24%

    (-45, 4%)

    ￬ 1%

    (-30, 40%)

    Rivaroxaban

    10, single dose

    (days 0 and 7)

    600 q12h

    (days 2 to 7)

    12

    ￪ 150%

    (130 to 170%)

    ￪ 60%

    (40 to 70%)

    ND

    Rifabutin

    25-O-desacetyl

    150 daily,

    16 d

    500 q12h, 10 d

    5,

    ￪ 4-fold

    (2.8, 6.1x)

    ￪ 2.5-fold

    (1.9, 3.4x)

    ￪ 6-fold

    (3.5, 18.3x)

    rifabutin metabolite

    11#

    ￪ 38-fold

    (28, 56x)

    ￪ 16-fold

    (13, 20x)

    ￪ 181-fold (ND)

    Sildenafil

    100, single dose

    500 twice daily, 8 d

    28

    ￪ 11-fold

    ￪ 4-fold

    ND

    Simeprevir

    200 mg qd,

    7 d

    100 mg bid, 15 d

    12

    ￪ 618%

    (463% to 815%)Þ

    ￪ 370%

    (284% to 476%)Þ

    ￪ 1335%

    (929% to 1901%)Þ

    Sulfamethoxazoleß

    800, single dose

    500 q12h, 12 d

    15

    ￬ 20%

    (16, 23%)

    ↔

    ND

    Tadalafil

    20 mg, single dose

    200 mg q12h

    ￪ 124%

    ↔

    ND

    Theophylline

    3 mg/kg q8h, 15 d

    500 q12h, 10 d

    13,

    11#

    ￬ 43%

    (42, 45%)

    ￬ 32%

    (29, 34%)

    ￬ 57%

    (55, 59%)

    Trazodone

    50 mg, single dose

    200 mg q12h, 4 doses

    10

    ￪ 2.4-fold

    ￪ 34%

    Trimethoprimß

    160, single dose

    500 q12h, 12 d

    15

    ￪ 20%

    (3, 43%)

    ↔

    ND

    Vardenafil

    5 mg

    600 q12h

    ￪ 49-fold

    ￪ 13-fold

    ND

    Voriconazole

    400 q12h, 1 d; then 200 q12h, 8 d

    400 q12h,

    9 d

    ￬ 82%

    ￬ 66%

    400 q12h, 1 d; then 200 q12h, 8 d

    100 q12h,

    9 d

    ￬ 39%

    ￬ 24%

    Warfarin
    S-Warfarin

    5, single dose

    400 q12h,

    12 d

    12

    ￪ 9%

    (-17, 44%)à

    ￬ 9%

    (-16, -2%)à


    ND

    R-Warfarin

    ￬33%

    •   (-38, -27%)à

    ↔

    ND

    Zidovudine

    200 q8h,

    4 d

    300 q6h,

    4 d

    9

    ￬ 25%

    (15, 34%)

    ￬ 27%

    (4, 45%)

    ND

    12.4 Microbiology

    Mechanism of Action:

    Ritonavir is a peptidomimetic inhibitor of the HIV-1 protease. Inhibition of HIV protease renders the enzyme incapable of processing the Gag-Pol polyprotein precursor which leads to production of non-infectious immature HIV particles.

    Antiviral Activity in Cell Culture:

    The activity of ritonavir was assessed in acutely infected lymphoblastoid cell lines and in peripheral blood lymphocytes. The concentration of drug that inhibits 50% (EC50) value of viral replication ranged from 3.8 to 153 nM depending upon the HIV-1 isolate and the cells employed. The average EC50 value for low passage clinical isolates was 22 nM (n=13). In MT4 cells, ritonavir demonstrated additive effects against HIV-1 in combination with either didanosine (ddI) or zidovudine (ZDV). Studies which measured cytotoxicity of ritonavir on several cell lines showed that greater than 20 microM was required to inhibit cellular growth by 50% resulting in a cell culture therapeutic index of at least 1,000.

    Resistance:

    HIV-1 isolates with reduced susceptibility to ritonavir have been selected in cell culture. Genotypic analysis of these isolates showed mutations in the HIV-1 protease gene leading to amino acid substitutions I84V, V82F, A71V, and M46I. Phenotypic (n=18) and genotypic (n=48) changes in HIV-1 isolates from selected patients treated with ritonavir were monitored in phase I/II trials over a period of 3 to 32 weeks. Substitutions associated with the HIV–1 viral protease in isolates obtained from 43 patients appeared to occur in a stepwise and ordered fashion at positions V82A/F/T/S, I54V, A71V/T, and I36L, followed by combinations of substitutions at an additional 5 specific amino acid positions (M46I/L, K20R, I84V, L33F and L90M). Of 18 patients for whom both phenotypic and genotypic analysis were performed on free virus isolated from plasma, 12 showed reduced susceptibility to ritonavir in cell culture. All 18 patients possessed one or more substitutions in the viral protease gene. The V82A/F substitution appeared to be necessary but not sufficient to confer phenotypic resistance. Phenotypic resistance was defined as a greater than or equal to 5-fold decrease in viral sensitivity in cell culture from baseline.

    Cross-Resistance to Other Antiretrovirals:

    Among protease inhibitors variable cross-resistance has been recognized. Serial HIV-1 isolates obtained from six patients during ritonavir therapy showed a decrease in ritonavir susceptibility in cell culture but did not demonstrate a concordant decrease in susceptibility to saquinavir in cell culture when compared to matched baseline isolates. However, isolates from two of these patients demonstrated decreased susceptibility to indinavir in cell culture (8-fold). Isolates from 5 patients were also tested for cross-resistance to amprenavir and nelfinavir; isolates from 3 patients had a decrease in susceptibility to nelfinavir (6- to 14-fold), and none to amprenavir. Cross-resistance between ritonavir and reverse transcriptase inhibitors is unlikely because of the different enzyme targets involved. One ZDV-resistant HIV-1 isolate tested in cell culture retained full susceptibility to ritonavir.

  • 13 NONCLINICAL TOXICOLOGY

    13.1 Carcinogenesis, Mutagenesis, Impairment of Fertility

    Carcinogenesis:

    Carcinogenicity studies in mice and rats have been carried out on ritonavir. In male mice, at levels of 50, 100 or 200 mg per kg per day, there was a dose dependent increase in the incidence of both adenomas and combined adenomas and carcinomas in the liver. Based on AUC measurements, the exposure at the high dose was approximately 0.3-fold for males that of the exposure in humans with the recommended therapeutic dose (600 mg twice-daily). There were no carcinogenic effects seen in females at the dosages tested. The exposure at the high dose was approximately 0.6-fold for the females that of the exposure in humans. In rats dosed at levels of 7, 15 or 30 mg per kg per day there were no carcinogenic effects. In this study, the exposure at the high dose was approximately 6% that of the exposure in humans with the recommended therapeutic dose. Based on the exposures achieved in the animal studies, the significance of the observed effects is not known.

    Mutagenesis:

    However, ritonavir was found to be negative for mutagenic or clastogenic activity in a battery of in vitro and in vivo assays including the Ames bacterial reverse mutation assay using S. typhimurium and E. coli, the mouse lymphoma assay, the mouse micronucleus test and chromosomal aberration assays in human lymphocytes.

    Impairment of Fertility:

    Ritonavir produced no effects on fertility in rats at drug exposures approximately 40% (male) and 60% (female) of that achieved with the proposed therapeutic dose. Higher dosages were not feasible due to hepatic toxicity.

  • 14 CLINICAL STUDIES

    The activity of ritonavir as monotherapy or in combination with nucleoside reverse transcriptase inhibitors has been evaluated in 1,446 patients enrolled in two double-blind, randomized trials.

    14.1 Advanced Patients with Prior Antiretroviral Therapy

    Study 247 was a randomized, double-blind trial (with open-label follow-up) conducted in HIV-infected patients with at least nine months of prior antiretroviral therapy and baseline CD4 cell counts less than or equal to 100 cells per µL. Ritonavir 600 mg twice-daily or placebo was added to each patient's baseline antiretroviral therapy regimen, which could have consisted of up to two approved antiretroviral agents. The study accrued 1,090 patients, with mean baseline CD4 cell count at study entry of 32 cells per µL. After the clinical benefit of ritonavir therapy was demonstrated, all patients were eligible to switch to open-label ritonavir for the duration of the follow-up period. Median duration of double-blind therapy with ritonavir and placebo was 6 months. The median duration of follow-up through the end of the open-label phase was 13.5 months for patients randomized to ritonavir and 14 months for patients randomized to placebo.

    The cumulative incidence of clinical disease progression or death during the double-blind phase of Study 247 was 26% for patients initially randomized to ritonavir compared to 42% for patients initially randomized to placebo. This difference in rates was statistically significant.

    Cumulative mortality through the end of the open-label follow-up phase for patients enrolled in Study 247 was 18% (99/543) for patients initially randomized to ritonavir compared to 26% (142/547) for patients initially randomized to placebo. This difference in rates was statistically significant. However, since the analysis at the end of the open-label phase includes patients in the placebo arm who were switched from placebo to ritonavir therapy, the survival benefit of ritonavir cannot be precisely estimated.

    During the double-blind phase of Study 247, CD4 cell counts increases from baseline for patients randomized to ritonavir at Week 2 and Week 4 were observed. From Week 4 and through Week 24, mean CD4 cell counts for patients randomized to ritonavir appeared to plateau. In contrast, there was no apparent change in mean CD4 cell counts for patients randomized to placebo at any visit between baseline and Week 24 of the double-blind phase of Study 247.

    14.2 Patients without Prior Antiretroviral Therapy

    In Study 245, 356 antiretroviral-naive HIV-infected patients (mean baseline CD4 = 364 cells per µL) were randomized to receive either ritonavir 600 mg twice-daily, zidovudine 200 mg three-times-daily, or a combination of these drugs.

    During the double-blind phase of study 245, greater mean CD4 cell count increases were observed from baseline to Week 12 in the ritonavir-containing arms compared to the zidovudine arms. Mean CD4 cell count changes subsequently appeared to plateau through Week 24 in the ritonavir arm, whereas mean CD4 cell counts gradually diminished through Week 24 in the zidovudine and ritonavir plus zidovudine arms.

    Greater mean reductions in plasma HIV-1 RNA levels were observed from baseline to Week 2 for the ritonavir-containing arms compared to the zidovudine arm. After Week 2 and through Week 24, mean plasma HIV-1 RNA levels either remained stable in the ritonavir and zidovudine arms or gradually rebounded toward baseline in the ritonavir plus zidovudine arm.

  • 15 REFERENCES

    • 1. Sewester CS. Calculations. In: Drug Facts and Comparisons. St. Louis, MO: J.B. Lippincott Co; January, 1997:xix.
  • 16 HOW SUPPLIED/STORAGE AND HANDLING

    Ritonavir Tablets USP

    100 mg tablet is supplied as a white-colored, oval shaped, shallow, film coated tablet with “54” debossed on one side and “247” debossed on the other side.

    0054-0407-13: Bottle of 30 Tablets

    0054-0407-23: Bottle of 120 Tablets

    Recommended Storage

    Store at or below 30°C (86°F). Exposure to temperatures up to 50°C (122°F) for seven days permitted. For patient use: exposure of this product to high humidity outside the original or USP equivalent tight container (60 mL or less) for longer than 2 weeks is not recommended. Dispense in original container or USP equivalent tight container (60 mL or less).

  • 17 PATIENT COUNSELING INFORMATION

    Advise the patient to read the FDA-approved patient labeling (Patient Information)

    General Administration Information [see Dosage and Administration (2)]:

    • Advise patients and caregivers to pay special attention to accurate preparation and administration of their dose to minimize the risk of accidental overdose or underdose of ritonavir.
    • Advise caregivers to inform their healthcare provider if their child’s weight changes in order to make sure that the child’s ritonavir dose is adjusted as needed.
    • Advise patients to take ritonavir with meals.
    • For adult patients taking ritonavir tablets, the maximum dose of 600 mg twice daily by mouth with meals should not be exceeded.
    • Advise patients to remain under the care of a physician while using ritonavir and to take ritonavir and other concomitant antiretroviral therapy every day as prescribed. Ritonavir must always be used in combination with other antiretroviral drugs. Advise patients not to alter the dose or discontinue therapy without consulting with their healthcare provider. If a dose of ritonavir is missed patients should take the dose as soon as possible and then return to their normal schedule. However, if a dose is skipped the patient should not double the next dose.
    • Continued ritonavir therapy at a dose of 600 mg twice daily following loss of viral suppression may increase the likelihood of cross-resistance to other protease inhibitors.
    • Ritonavir is not a cure for HIV-1 infection and patients may continue to experience illnesses associated with HIV-1 infection, including opportunistic infections. Patients should remain under the care of a physician when using ritonavir.

    Drug Interactions:

    • Ritonavir may interact with some drugs; therefore, patients should be advised to report to their doctor the use of any other prescription, non-prescription medication or herbal products, particularly St. John's Wort.
    • Instruct patients receiving combined hormonal contraception to use an effective alternative contraceptive method or an additional barrier method during therapy with ritonavir because hormonal levels may decrease [see Drug Interactions (7.2), Use in Specific Populations (8.3)].

    Hepatotoxicity:

    Pre-existing liver disease including Hepatitis B or C can worsen with use of ritonavir. This can be seen as worsening of transaminase elevations or hepatic decompensation. Advise patients that their liver function tests will need to be monitored closely especially during the first several months of ritonavir treatment and that they should notify their healthcare provider if they develop the signs and symptoms of worsening liver disease including loss of appetite, abdominal pain, jaundice, and itchy skin [see Warnings and Precautions (5.3)].

    Pancreatitis:

    Pancreatitis, including some fatalities, has been observed in patients receiving ritonavir therapy. Advise patients to notify their healthcare provider of signs and symptoms (nausea, vomiting, and abdominal pain) that might be suggestive of pancreatitis [see Warnings and Precautions (5.4)].

    Allergic Reactions/Hypersensitivity:

    Skin rashes ranging in severity from mild to Stevens-Johnson syndrome have been reported in patients receiving ritonavir. Advise patients to contact their healthcare provider if they develop a rash while taking ritonavir [see Warnings and Precautions (5.5)].

    PR Interval Prolongation:

    Ritonavir may produce changes in the electrocardiogram (e.g., PR prolongation). Advise patients to consult their healthcare provider if they experience symptoms such as dizziness, lightheadedness, abnormal heart rhythm or loss of consciousness [see Warnings and Precautions (5.6)].

    Lipid Disorders:

    Advise patients that treatment with ritonavir therapy can result in substantial increases in the concentration of total cholesterol and triglycerides [see Warnings and Precautions (5.7)].

    Diabetes Mellitus/Hyperglycemia:

    Advise patients that new onset of diabetes or exacerbation of pre-existing diabetes mellitus, and hyperglycemia have been reported and to notify their healthcare provider if they develop the signs and symptoms of diabetes mellitus including frequent urination, excessive thirst, extreme hunger or unusual weight loss and/or an increased blood sugar while on ritonavir as they may require a change in their diabetes treatment or new treatment [see Warnings and Precautions (5.8)].

    Immune Reconstitution Syndrome:

    Advise patients that immune reconstitution syndrome has been reported in HIV-infected patients treated with combination antiretroviral therapy, including ritonavir [see Warnings and Precautions (5.9)].

    Fat Redistribution:

    Advise patients that redistribution or accumulation of body fat may occur in patients receiving antiretroviral therapy and that the cause and long term health effects of these conditions are not known at this time [see Warnings and Precautions (5.10)].

    Patients with Hemophilia:

    Advise patients with hemophilia that they may experience increased bleeding when treated with protease inhibitors such as ritonavir [see Warnings and Precautions (5.11)].

    Ritonavir Oral Solution Not Recommended During Pregnancy:

    Advise pregnant women that use of ritonavir oral solution during pregnancy is not recommended due to its ethanol content [see Dosage and Administration (2.3) and Use in Specific Population (8.1)].

    Pregnancy Exposure Registry:

    Inform patients that there is an antiretroviral pregnancy registry that monitors fetal outcomes of pregnant women exposed to ritonavir [see Use in Specific Populations (8.1)].

    Lactation:

    Instruct women with HIV-1 infection not to breastfeed because HIV-1 can be passed to the baby in breast milk [see Use in Specific Populations (8.2)].

    Manufactured by:

    Cipla Limited,

    Patalganga,

    Maharashtra, India

    Manufactured for: West-Ward

    Pharmaceuticals Corp.

    Eatontown, NJ 07724

    21082015

    Revised January 2020

  • PATIENT INFORMATION

    Ritonavir Tablets USP

    (ri ton’ na vir)

    Rx only

    What is the most important information I should know about ritonavir?

    • Ritonavir can interact with other medicines and cause serious side effects. It is important to know the medicines that should not be taken with ritonavir. See the section “Who should not take ritonavir?”

    What is ritonavir?

    • Ritonavir tablets are a prescription medicine that is used with other antiviral medicines to treat people with human immunodeficiency virus (HIV-1) infection.

    HIV-1 is the virus that causes AIDS (Acquired Immune Deficiency Syndrome).

    Do not take ritonavir if you or your child:

    • are allergic to ritonavir or any of the ingredients in ritonavir tablets. See the end of this leaflet for a complete list of ingredients in ritonavir tablets.
    • If you take any of the following medicines:
      • o alfuzosin
      • o apalutamide
      • o ranolazine
      • o dronedarone
      • o colchicine, if you have kidney or liver problems.
      • o lurasidone
      • o pimozide
      • o amiodarone
      • o ergot-containing medicines including:
        • ▪ dihydroergotamine mesylate
        • ▪ ergotamine tartrate
        • ▪ methylergonovine maleate
      • o cisapride
      • o flecainide
      • o lovastatin
      • o simvastatin
      • o lomitapide
      • o sildenafil (REVATIO®) only when used for treating the lung problem, pulmonary arterial hypertension (PAH)
      • o triazolam
      • o midazolam, when taken by mouth
      • o propafenone
      • o quinidine
      • o St. John’s Wort (Hypericum perforatum) or a product that contains St. John’s wort
      • o voriconazole if your ritonavir dose is 400 mg every 12 hours or greater

    Serious problems can happen if you or your child takes any of these medicines with Ritonavir Tablets.

    Before taking ritonavir, tell your healthcare provider about all of your medical conditions, including if you or your child:

    • have liver problems, including Hepatitis B or Hepatitis C
    • have heart problems
    • have high blood sugar (diabetes)
    • have bleeding problems or hemophilia
    • are pregnant or plan to become pregnant.
      • o Ritonavir oral solution contains alcohol. You should not take ritonavir oral solution during pregnancy because there is no known safe level of alcohol exposure during pregnancy. Tell your healthcare provider if you become pregnant during treatment with Ritonavir oral solution.
      • o Ritonavir may reduce how well hormonal birth control works. Females who may become pregnant should use another effective form of birth control or an additional barrier method of birth control during treatment with ritonavir.
      • o Pregnancy Registry: There is a pregnancy registry for women who take antiviral medicines during pregnancy. The purpose of the registry is to collect information about the health of you and your baby. Talk to your healthcare provider about how you can take part in this registry.
    • are breastfeeding or plan to breastfeed. Do not breastfeed if you take ritonavir.
      • o You should not breastfeed if you have HIV-1 because of the risk of passing HIV-1 to your baby.
      • o Ritonavir may pass into your breastmilk.
      • o Talk to your healthcare provider about the best way to feed your baby.

    Tell your healthcare provider about all the medicines you take including prescription and over-the-counter medicines, vitamins, and herbal supplements. Some medicines interact with ritonavir. Keep a list of your medicines to show your healthcare provider and pharmacist.

    • You can ask your healthcare provider or pharmacist for a list of medicines that interact with ritonavir.
    • Do not start taking a new medicine without telling your healthcare provider. Your healthcare provider can tell you if it is safe to take ritonavir with other medicines.

    How should I take ritonavir?

    • Take ritonavir exactly as your healthcare provider tells you to take it.
    • You should stay under a healthcare provider's care during treatment with ritonavir. Do not change your dose of ritonavir or stop your treatment without talking with your healthcare provider first.
    • If your child is taking ritonavir, your child’s healthcare provider will decide the right dose based on your child's height and weight. Tell your healthcare provider if your child’s weight changes. If your child does not tolerate ritonavir oral solution or ritonavir oral powder, ask your child’s healthcare provider for advice.
    • Swallow ritonavir tablets whole. Do not chew, break, or crush tablets before swallowing. If you cannot swallow ritonavir tablets whole, tell your healthcare provider. You may need a different medicine.
    • Take ritonavir with meals.
    • Do not run out of ritonavir. Get your ritonavir prescription refilled from your healthcare provider or pharmacy before you run out.
    • If you miss a dose of ritonavir, take it as soon as possible and then take your next scheduled dose at its regular time. If it is almost time for your next dose, wait and take the next dose at the regular time. Do not double the next dose.
    • If you take too much ritonavir, call your local poison control center or go to the nearest hospital emergency room right away.

    What are the possible side effects of ritonavir?

    Ritonavir can cause serious side effects including:

    • See “What is the most important information I should know about ritonavir?”
    • Liver problems. Some people taking ritonavir in combination with other antiviral medicines have developed liver problems which may be life-threatening. Your healthcare provider should do regular blood tests during your combination treatment with ritonavir. If you have chronic hepatitis B or C infection, your healthcare provider should check your blood tests more often because you have an increased chance of developing liver problems. Tell your healthcare provider right away if you get any of the following signs and symptoms of liver problems:
    • o loss of appetite
    • o pain or tenderness on your right side below your ribs
    • o yellowing of your skin or whites of your eyes
    • o itchy skin
    • Inflammation of your pancreas (pancreatitis). Ritonavir can cause serious pancreas problems, which may lead to death. Tell your healthcare provider right away if you have signs or symptoms of pancreatitis such as:
    • o nausea
    • o stomach (abdomen) pain
    • o vomiting
    • Allergic reactions. Sometimes these allergic reactions can become severe and require treatment in a hospital. Call your healthcare provider right away if you develop a rash. Stop taking Ritonavir Tablets and get medical help right away if you have any of the following symptoms of a severe allergic reaction:
    • o trouble breathing
    • o wheezing
    • o dizziness or fainting
    • o throat tightness or hoarseness
    • o fast heartbeat or pounding in your chest (tachycardia)
    • o sweating
    • o swelling of your face, lips or tongue
    • o muscle or joint pain
    • o blisters or skin lesions
    • o mouth sores or ulcers

    Changes in the electrical activity of your heart called PR prolongation. PR prolongation can cause irregular heartbeats. Tell your healthcare provider right away if you have symptoms such as:
    • o dizziness
    • o lightheadedness
    • feel faint or pass out
    • abnormal heart beat
    • Increase in cholesterol and triglyceride levels. Treatment with ritonavir may increase your blood levels of cholesterol and triglycerides. Your healthcare provider should do blood tests before you start your treatment with ritonavir and regularly to check for an increase in your cholesterol and triglycerides levels.
    • Diabetes and high blood sugar (hyperglycemia). Some people who take protease inhibitors including ritonavir can get high blood sugar, develop diabetes, or your diabetes can get worse. Tell your healthcare provider if you notice an increase in thirst or urinate often during treatment with ritonavir.
    • Changes in your immune system (Immune Reconstitution Syndrome) can happen when you start taking HIV-1 medicines. Your immune system may get stronger and begin to fight infections that have been hidden in your body for a long time. Call your healthcare provider right away if you start having new symptoms after starting your HIV-1 medicine.
    • Change in body fat can happen in some people who taking HIV-1 medicines. These changes may include an increased amount of fat in the upper back and neck (“buffalo hump”), breast, and around the middle part of your body (trunk). Loss of fat from the legs, arms, and face may also happen. The exact cause and long-term health effects of these conditions are not known.
    • Increased bleeding for hemophiliacs. Some people with hemophilia have increased bleeding with protease inhibitors including ritonavir.

    The most common side effects of ritonavir include:

    • diarrhea
    • nausea
    • vomiting
    • upper and lower stomach (abdominal) pain
    • tingling feeling or numbness in hands or feet or around the lips
    • rash
    • feeling weak or tired

    Ritonavir oral solution contains a large amount of alcohol. If a toddler or young child accidentally drinks more than the recommended dose of ritonavir oral solution, it could make him/her sick from too much alcohol. Go to the nearest emergency room right away if this happens.

    These are not all of the possible side effects of ritonavir. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

    How should I store Ritonavir Tablets USP?

    • Store Ritonavir Tablets USP in the original container given to you by the pharmacist.
    • Use Ritonavir Tablets USP by the expiration date.

    Store Ritonavir Tablets USP:

    • Store below 30°C (86°F). Exposure to temperatures up to 50°C (122°F) for seven days permitted.
    • Exposure to high humidity outside the original container for longer than 2 weeks is not recommended.

    Keep Ritonavir Tablets and all medicines out of the reach of children.

    General information about the safe and effective use of ritonavir

    Medicines are sometimes prescribed for purposes other than those listed in a Patient Information Leaflet.

    Do not use ritonavir for a condition for which it was not prescribed. Do not give ritonavir to other people, even if they have the same symptoms that you have. It may harm them. You can ask your pharmacist or healthcare provider for information about ritonavir that is written for healthcare professionals.

    What are the ingredients in Ritonavir Tablets USP?

    Active ingredient: ritonavir USP

    Inactive ingredients: anhydrous dibasic calcium phosphate, colloidal silicon dioxide, copovidone, hypromellose, isopropyl alcohol, polysorbate 80, polyethylene glycol, purified water, sodium stearyl fumarate, sorbitan monolaurate and titanium dioxide.

    The brands listed are trademarks of their respective owners and are not trademarks of West-Ward Pharmaceuticals Corp. The makers of these brands are not affiliated with and do not endorse West-Ward Pharmaceuticals Corp. or its products.

    This Patient Information has been approved by the U.S. Food and Drug Administration.

    Manufactured by:

    Cipla Limited,

    Patalganga,

    Maharashtra, India

    Manufactured for: West-Ward

    Pharmaceuticals Corp.

    Eatontown, NJ 07724

    21082015

    Revised January 2020

  • PACKAGE/LABEL PRINCIPAL DISPLAY PANEL

    Ritonavir Tablets USP, 100 mg

    0054-0407-13

    Rx only

    label-100mg-30tabs-01.jpg
  • INGREDIENTS AND APPEARANCE
    RITONAVIR 
    ritonavir tablet, film coated
    Product Information
    Product TypeHUMAN PRESCRIPTION DRUGItem Code (Source)NDC: 0054-0407
    Route of AdministrationORAL
    Active Ingredient/Active Moiety
    Ingredient NameBasis of StrengthStrength
    RITONAVIR (UNII: O3J8G9O825) (RITONAVIR - UNII:O3J8G9O825) RITONAVIR100 mg
    Inactive Ingredients
    Ingredient NameStrength
    ANHYDROUS DIBASIC CALCIUM PHOSPHATE (UNII: L11K75P92J)  
    SILICON DIOXIDE (UNII: ETJ7Z6XBU4)  
    COPOVIDONE K25-31 (UNII: D9C330MD8B)  
    HYPROMELLOSE, UNSPECIFIED (UNII: 3NXW29V3WO)  
    ISOPROPYL ALCOHOL (UNII: ND2M416302)  
    POLYSORBATE 80 (UNII: 6OZP39ZG8H)  
    POLYETHYLENE GLYCOL, UNSPECIFIED (UNII: 3WJQ0SDW1A)  
    WATER (UNII: 059QF0KO0R)  
    SODIUM STEARYL FUMARATE (UNII: 7CV7WJK4UI)  
    SORBITAN MONOLAURATE (UNII: 6W9PS8B71J)  
    TITANIUM DIOXIDE (UNII: 15FIX9V2JP)  
    Product Characteristics
    ColorWHITEScoreno score
    ShapeOVALSize17mm
    FlavorImprint Code 54;247
    Contains    
    Packaging
    #Item CodePackage DescriptionMarketing Start DateMarketing End Date
    1NDC: 0054-0407-1330 in 1 BOTTLE; Type 0: Not a Combination Product03/20/2018
    2NDC: 0054-0407-23120 in 1 BOTTLE; Type 0: Not a Combination Product01/31/2050
    Marketing Information
    Marketing CategoryApplication Number or Monograph CitationMarketing Start DateMarketing End Date
    ANDAANDA20257303/20/2018
    Labeler - West-Ward Pharmaceuticals Corp. (080189610)
    Establishment
    NameAddressID/FEIBusiness Operations
    Cipla Limited916940208MANUFACTURE(0054-0407)
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