TADALAFIL tablet, film coated

Tadalafil by

Drug Labeling and Warnings

Tadalafil by is a Prescription medication manufactured, distributed, or labeled by Dr.Reddys Laboratories Inc, Dr. Reddys Laboratories Limited (SEZ UNIT). Drug facts, warnings, and ingredients follow.

Drug Details [pdf]

  • 1 INDICATIONS AND USAGE

    1.1 Pulmonary Arterial Hypertension

    Tadalafil tablets are indicated for the treatment of pulmonary arterial hypertension (PAH) (WHO Group 1) to improve exercise ability. Studies establishing effectiveness included predominately patients with NYHA Functional Class II to III symptoms and etiologies of idiopathic or heritable PAH (61%) or PAH associated with connective tissue diseases (23%).

  • 2 DOSAGE AND ADMINISTRATION

    2.1 Pulmonary Arterial Hypertension

    The recommended dose of tadalafil is 40 mg (two 20 mg tablets) taken once daily with or without food. Dividing the dose (40 mg) over the course of the day is not recommended.

    2.2 Use in Special Populations

    Renal Impairment

    Mild (creatinine clearance 51 to 80 mL/min) or moderate (creatinine clearance 31 to 50 mL/min): Start dosing at 20 mg once daily. Increase to 40 mg once daily based on individual tolerability.

    Severe (creatinine clearance <30 mL/min and on hemodialysis): Avoid use of tadalafil because of increased tadalafil exposure (AUC), limited clinical experience, and the lack of ability to influence clearance by dialysis [see Warnings and Precautions (5.3) and Use in Specific Populations (8.6)].  

    Hepatic Impairment

    Mild or moderate (Child Pugh Class A or B): Because of limited clinical experience in patients with mild to moderate hepatic cirrhosis, consider a starting dose of 20 mg once per day.

    Severe (Child Pugh Class C): Patients with severe hepatic cirrhosis have not been studied. Avoid use of tadalafil [see Warnings and Precautions (5.4) and Use in Specific Populations (8.7)].  

    Geriatric Patients

    No dose adjustment is required in patients >65 years of age without renal impairment or hepatic impairment.

    2.3 Use with Ritonavir

    Co-administration of Tadalafil in Patients on Ritonavir

    In patients receiving ritonavir for at least one week, start tadalafil at 20 mg once daily. Increase to 40 mg once daily based upon individual tolerability [see Warnings and Precautions (5.2), Drug Interactions (7.2) and Clinical Pharmacology (12.3)].

    Co-administration of Ritonavir in Patients on Tadalafil

    Avoid use of tadalafil during the initiation of ritonavir. Stop tadalafil at least 24 hours prior to starting ritonavir. After at least one week following the initiation of ritonavir, resume tadalafil at 20 mg once daily. Increase to 40 mg once daily based upon individual tolerability [see Warnings and Precautions (5.2), Drug Interactions (7.2) and Clinical Pharmacology (12.3)].

  • 3 DOSAGE FORMS AND STRENGTHS

    20 mg, oval shaped, biconvex, yellow colored, film-coated tablet, debossed with image2on one side and plain on other side.

  • 4 CONTRAINDICATIONS

    4.1 Concomitant Organic Nitrates

    Do not use tadalafil tablets in patients who are using any form of organic nitrate, either regularly or intermittently. Tadalafil potentiates the hypotensive effect of nitrates. This potentiation is thought to result from the combined effects of nitrates and tadalafil on the nitric oxide/cGMP pathway [see Clinical Pharmacology (12.2)].

    4.2 Concomitant Guanylate Cyclase (GC) Stimulators

    Do not use tadalafil tablets in patients who are using a GC stimulator, such as riociguat. Tadalafil may potentiate the hypotensive effects of GC stimulators.

    4.3 Hypersensitivity Reactions

    Tadalafil tablets are contraindicated in patients with a known serious hypersensitivity to tadalafil (tadalafil tablets or CIALIS). Hypersensitivity reactions have been reported, including Stevens-Johnson syndrome and exfoliative dermatitis [see Adverse Reactions (6.2)].

  • 5 WARNINGS AND PRECAUTIONS

    5.1 Cardiovascular Effects

    Discuss with patients the appropriate action to take in the event that they experience anginal chest pain requiring nitroglycerin following intake of tadalafil. At least 48 hours should elapse after the last dose of tadalafil before taking nitrates. If a patient has taken tadalafil within 48 hours, administer nitrates under close medical supervision with appropriate hemodynamic monitoring. Patients who experience anginal chest pain after taking tadalafil should seek immediate medical attention.  

    PDE5 inhibitors, including tadalafil, have mild systemic vasodilatory properties that may result in transient decreases in blood pressure. Prior to prescribing tadalafil, carefully consider whether patients with underlying cardiovascular disease could be affected adversely by such vasodilatory effects. Patients with severely impaired autonomic control of blood pressure or with left ventricular outflow obstruction, (e.g., aortic stenosis and idiopathic hypertrophic subaortic stenosis) may be particularly sensitive to the actions of vasodilators, including PDE5 inhibitors.

    Pulmonary vasodilators may significantly worsen the cardiovascular status of patients with pulmonary venoocclusive disease (PVOD). Since there are no clinical data on administration of tadalafil to patients with veno-occlusive disease, administration of tadalafil to such patients is not recommended. Should signs of pulmonary edema occur when tadalafil is administered, the possibility of associated PVOD should be considered.  

    There is a lack of data on safety and efficacy in the following groups who were specifically excluded from the PAH clinical trials:

    Patients with clinically significant aortic and mitral valve disease

    Patients with pericardial constriction

    Patients with restrictive or congestive cardiomyopathy

    Patients with significant left ventricular dysfunction

    Patients with life-threatening arrhythmias

    Patients with symptomatic coronary artery disease

    Patients with hypotension (<90/50 mm Hg) or uncontrolled hypertension  

    Use with Alpha Blockers and Antihypertensives

    PDE5 inhibitors, including tadalafil, and alpha–adrenergic blocking agents are vasodilators with blood pressure– lowering effects. When vasodilators are used in combination, an additive effect on blood pressure may be anticipated. In some patients, concomitant use of these two drug classes can lower blood pressure significantly [see Drug Interactions (7.1) and Clinical Pharmacology (12.2)], which may lead to symptomatic hypotension (e.g., fainting). Safety of combined use of PDE5 inhibitors and alpha blockers may be affected by other variables, including intravascular volume depletion and use of other antihypertensive drugs [see Drug Interactions (7.1)].  

    Use with Alcohol

    Both alcohol and tadalafil are mild vasodilators. When mild vasodilators are taken in combination, blood pressure-lowering effects are increased [see Drug Interactions (7.1) and Clinical Pharmacology (12.2)].

    5.2 Use with Potent CYP3A Inhibitors or Inducers

    Co-administration of Tadalafil in Patients on Ritonavir

    In patients receiving ritonavir for at least one week, start tadalafil at 20 mg once daily. Increase to 40 mg once daily based upon individual tolerability [see Dosage and Administration (2.3), Drug Interactions (7.2) and Clinical Pharmacology (12.3)].  

    Co-administration of Ritonavir in Patients on Tadalafil

    Avoid use of tadalafil tablets during the initiation of ritonavir. Stop tadalafil tablets at least 24 hours prior to starting ritonavir. After at least one week following the initiation of ritonavir, resume tadalafil at 20 mg once daily. Increase to 40 mg once daily based upon individual tolerability [see Dosage and Administration (2.3), Drug Interactions (7.2) and Clinical Pharmacology (12.3)].

    Other Potent Inhibitors of CYP3A

    Tadalafil is metabolized predominantly by CYP3A in the liver. In patients taking potent inhibitors of CYP3A such as ketoconazole and itraconazole, avoid use of tadalafil [see Drug Interactions (7.2) and Clinical Pharmacology (12.3)].  

    Potent Inducers of CYP3A

    For patients chronically taking potent inducers of CYP3A, such as rifampin, avoid use of tadalafil [see Drug Interactions (7.2) and Clinical Pharmacology (12.3)].

    5.3 Use in Renal Impairment

    In patients with mild or moderate renal impairment

    Start dosing at 20 mg once daily. Increase the dose to 40 mg once daily based upon individual tolerability [see Dosage and Administration (2.2) and Clinical Pharmacology (12.3)].  

    In patients with severe renal impairment

    Avoid use of tadalafil because of increased tadalafil exposure (AUC), limited clinical experience, and the lack of ability to influence clearance by dialysis [see Dosage and Administration (2.2) and Clinical Pharmacology (12.3)].

    5.4 Use in Hepatic Impairment

    In patients with mild to moderate hepatic cirrhosis (Child-Pugh Class A and B)

    Because of limited clinical experience in patients with mild to moderate hepatic cirrhosis, consider a starting dose of 20 mg once daily tadalafil [see Dosage and Administration (2.2) and Clinical Pharmacology (12.3)].  

    In patients with severe hepatic cirrhosis (Child-Pugh Class C)

    Patients with severe hepatic cirrhosis have not been studied. Avoid use of tadalafil [see Dosage and Administration (2.2) and Clinical Pharmacology (12.3)].

    5.5 Visual Loss

    Physicians should advise patients to seek immediate medical attention in the event of a sudden loss of vision in one or both eyes. Such an event may be a sign of non–arteritic anterior ischemic optic neuropathy (NAION), a cause of decreased vision, including permanent loss of vision, that has been reported postmarketing in temporal association with the use of all PDE5 inhibitors. Most, but not all, of these patients had underlying anatomic or vascular risk factors for development of NAION, including but not necessarily limited to: low cup to disc ratio (“crowded disc”), age over 50, diabetes, hypertension, coronary artery disease, hyperlipidemia, and smoking. Based on published literature, the annual incidence of NAION is 2.5 to 11.8 cases per 100,000 in males aged ≥50 in the general population. An observational case-crossover study evaluated the risk of NAION when PDE5 inhibitor use, as a class, typical of erectile dysfunction treatment, occurred immediately before NAION onset (within 5 half-lives), compared to PDE5 inhibitor use in a prior time period. The results suggest an approximate 2-fold increase in the risk of NAION, with a risk estimate of 2.15 (95% CI 1.06, 4.34). A similar study reported a consistent result, with a risk estimate of 2.27 (95% CI 0.99, 5.20). Other risk factors for NAION, such as the presence of “crowded” optic disc, may have contributed to the occurrence of NAION in these studies. 

    Neither the rare postmarketing reports, nor the association of PDE5 inhibitor use and NAION in the observational studies, substantiate a causal relationship between PDE5 inhibitor use and NAION [see Adverse Reactions (6.2)]. 

    Physicians should also discuss with patients the increased risk of NAION in individuals who have already experienced NAION in one eye, including whether such individuals could be adversely affected by use of vasodilators such as PDE5 inhibitors.  

    Patients with known hereditary degenerative retinal disorders, including retinitis pigmentosa, were not included in the clinical trials, and use in these patients is not recommended.

    5.6 Hearing Impairment

    Physicians should advise patients to seek immediate medical attention in the event of sudden decrease or loss of hearing. These events, which may be accompanied by tinnitus and dizziness, have been reported in temporal association to the intake of PDE5 inhibitors, including tadalafil. It is not possible to determine whether these events are related directly to the use of PDE5 inhibitors or to other factors [see Adverse Reactions (6.2)].

    5.7 Combination with Other PDE5 Inhibitors

    Tadalafil is also marketed as CIALIS. The safety and efficacy of taking tadalafil tablets together with CIALIS or other PDE5 inhibitors have not been studied. Inform patients taking tadalafil tablets not to take CIALIS or other PDE5 inhibitors.

    5.8 Prolonged Erection

    There have been rare reports of prolonged erections greater than 4 hours and priapism (painful erections greater than 6 hours in duration) for this class of compounds. Priapism, if not treated promptly, can result in irreversible damage to the erectile tissue. Patients who have an erection lasting greater than 4 hours, whether painful or not, should seek emergency medical attention.  

    Tadalafil should be used with caution in patients who have conditions that might predispose them to priapism (such as sickle cell anemia, multiple myeloma, or leukemia), or in patients with anatomical deformation of the penis (such as angulation, cavernosal fibrosis, or Peyronie’s disease).

    5.9 Effects on Bleeding

    PDE5 is found in platelets. When administered in combination with aspirin, tadalafil 20 mg did not prolong bleeding time, relative to aspirin alone. Tadalafil has not been administered to patients with bleeding disorders or significant active peptic ulceration. Although tadalafil has not been shown to increase bleeding times in healthy subjects, use in patients with bleeding disorders or significant active peptic ulceration should be based upon a careful risk-benefit assessment.

  • 6 ADVERSE REACTIONS

    The following serious adverse reactions are discussed elsewhere in the labeling:

    Hypotension [see Warnings and Precautions (5.1)]

    Visual Loss [see Warnings and Precautions (5.5) and Patient Counseling Information (17)]

    Hearing loss [see Warnings and Precautions (5.6)]

    Priapism [see Warnings and Precautions (5.8)]

    6.1 Clinical Trials Experience

    Because clinical trials are conducted under widely varying conditions, adverse reaction 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.  

    Tadalafil was administered to 398 patients with PAH during clinical trials worldwide. In trials of tadalafil, a total of 311 and 251 subjects have been treated for at least 182 days and 360 days, respectively. The overall rates of discontinuation because of an adverse event (AE) in the placebo-controlled trial were 9% for tadalafil 40 mg and 15% for placebo. The rates of discontinuation because of AEs, other than those related to worsening of PAH, in patients treated with tadalafil 40 mg was 4% compared to 5% in placebo-treated patients.  

    In the placebo-controlled study, the most common AEs were generally transient and mild to moderate in intensity. Table 1 presents treatment-emergent adverse events reported by ≥9% of patients in the tadalafil 40 mg group and occurring more frequently than with placebo.

    Table 1: Treatment-Emergent Adverse Events Reported by ≥9% of Patients in Tadalafil and More Frequent than Placebo by 2%

    EVENT Placebo (%)
    (N=82)    		Tadalafil 20 mg (%)
    (N=82)    		Tadalafil 40 mg (%)
    (N=79)
    Headache 15 32 42
    Myalgia 4 9 14
    Nasopharyngitis 7 2 13
    Flushing 2 6 13
    Respiratory Tract Infection
    (Upper and Lower)     		6 7 13
    Pain in Extremity 2 5 11
    Nausea 6 10 11
    Back Pain 6 12 10
    Dyspepsia 2 13 10
    Nasal Congestion
    (Including sinus congestion)     		1 0 9

    6.2 Postmarketing Experience

    The following adverse reactions have been identified during post-approval use of tadalafil. These events have been chosen for inclusion either because of their seriousness, reporting frequency, lack of clear alternative causation, or a combination of these factors. Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to estimate reliably their frequency or establish a causal relationship to drug exposure. The list does not include adverse events that are reported from clinical trials and that are listed elsewhere in this section.  

    Cardiovascular and cerebrovascular — Serious cardiovascular events, including myocardial infarction, sudden cardiac death, stroke, chest pain, palpitations, and tachycardia, have been reported postmarketing in temporal association with the use of tadalafil. Most, but not all, of these patients had preexisting cardiovascular risk factors. Many of these events were reported to occur during or shortly after sexual activity, and a few were reported to occur shortly after the use of tadalafil without sexual activity. Others were reported to have occurred hours to days after the use of tadalafil and sexual activity. It is not possible to determine whether these events are related directly to tadalafil, to sexual activity, to the patient’s underlying cardiovascular disease, to a combination of these factors, or to other factors [see Warnings and Precautions (5.1)].  

    Body as a whole — Hypersensitivity reactions including urticaria, Stevens–Johnson syndrome, and exfoliative dermatitis  

    Nervous — Migraine, seizure and seizure recurrence, and transient global amnesia  

    Ophthalmologic — Visual field defect, retinal vein occlusion, retinal artery occlusion, and NAION [see Warnings and Precautions (5.5) and Patient Counseling Information (17)].  

    Otologic — Cases of sudden decrease or loss of hearing have been reported postmarketing in temporal association with the use of PDE5 inhibitors, including tadalafil. In some of the cases, medical conditions and other factors were reported that may have also played a role in the otologic adverse events. In many cases, medical follow-up information was limited. It is not possible to determine whether these reported events are related directly to the use of tadalafil, to the patient’s underlying risk factors for hearing loss, a combination of these factors, or to other factors [see Warnings and Precautions (5.6) and Patient Counseling Information (17)].  

    Urogenital — Priapism [see Warnings and Precautions (5.8)].

  • 7 DRUG INTERACTIONS

    7.1 Potential for Pharmacodynamic Interactions with Tadalafil

    Nitrates

    Do not use tadalafil in patients who are using any form of organic nitrate [see Contraindications (4.1)]. In clinical pharmacology studies tadalafil potentiated the hypotensive effect of nitrates [see Clinical Pharmacology (12.2)]. In a patient who has taken tadalafil, where nitrate administration is deemed medically necessary in a life–threatening situation, at least 48 hours should elapse after the last dose of tadalafil before nitrate administration is considered. In such circumstances, nitrates should still only be administered under close medical supervision with appropriate hemodynamic monitoring.  

    Alpha-Blockers

    PDE5 inhibitors, including tadalafil, and alpha–adrenergic blocking agents are both vasodilators with blood-pressure-lowering effects. When vasodilators are used in combination, an additive effect on blood pressure may be anticipated. Clinical pharmacology studies have been conducted with coadministration of tadalafil with doxazosin, alfuzosin or tamsulosin [see Warnings and Precautions (5.1) and Clinical Pharmacology (12.2)].  

    Antihypertensives

    PDE5 inhibitors, including tadalafil, are mild systemic vasodilators. Clinical pharmacology studies were conducted to assess the effect of tadalafil on the potentiation of the blood–pressure–lowering effects of selected antihypertensive medications (amlodipine, angiotensin II receptor blockers, bendroflumethiazide, enalapril, and metoprolol). Small reductions in blood pressure occurred following coadministration of tadalafil with these agents compared with placebo [see Warnings and Precautions (5.1) and Clinical Pharmacology (12.2)].  

    Alcohol

    Both alcohol and tadalafil, a PDE5 inhibitor, act as mild vasodilators. When mild vasodilators are taken in combination, blood pressure–lowering effects of each individual compound may be increased. Substantial consumption of alcohol (e.g., 5 units or greater) in combination with tadalafil can increase the potential for orthostatic signs and symptoms, including increase in heart rate, decrease in standing blood pressure, dizziness, and headache. Tadalafil (10 mg or 20 mg) did not affect alcohol plasma concentrations and alcohol did not affect tadalafil plasma concentrations. [See Warnings and Precautions (5.1) and Clinical Pharmacology (12.2)].

    7.2 Potential for Other Drugs to Affect Tadalafil

    Ritonavir

    Ritonavir initially inhibits and later induces CYP3A, the enzyme involved in the metabolism of tadalafil. At steady state of ritonavir (about 1 week), the exposure to tadalafil is similar as in the absence of ritonavir [see Dosage and Administration (2.3), Warnings and Precautions (5.2), and Clinical Pharmacology (12.3)].  

    Other Potent Inhibitors of CYP3A

    Tadalafil is metabolized predominantly by CYP3A in the liver. In patients taking potent inhibitors of CYP3A such as ketoconazole, and itraconazole, avoid use of tadalafil [see Warnings and Precautions (5.2) and Clinical Pharmacology (12.3)].  

    Potent Inducers of CYP3A

    For patients chronically taking potent inducers of CYP3A, such as rifampin, avoid use of tadalafil [see Warnings and Precautions (5.2) and Clinical Pharmacology (12.3)].

    7.3 Potential for Tadalafil to Affect Other Drugs

    Cytochrome P450 Substrates

    Tadalafil is not expected to cause clinically significant inhibition or induction of the clearance of drugs metabolized by cytochrome P450 (CYP) isoforms (e.g., theophylline, warfarin, midazolam, lovastatin, bosentan) [see Clinical Pharmacology (12.3)].  

    Aspirin

    Tadalafil (10 mg and 20 mg once daily) does not potentiate the increase in bleeding time caused by aspirin [see Clinical Pharmacology (12.3)].  

    P-glycoprotein (e.g., digoxin)

    Coadministration of tadalafil (40 mg once daily) for 10 days did not significantly alter digoxin pharmacokinetics in healthy subjects [see Clinical Pharmacology (12.3)].

  • 8 USE IN SPECIFIC POPULATIONS

    8.1 Pregnancy

    Pregnancy Category B

    Animal reproduction studies in rats and mice revealed no evidence of fetal harm. There are, however, no adequate and well-controlled studies of tadalafil in pregnant women. Because animal reproduction studies are not always predictive of human response, tadalafil should be used during pregnancy only if clearly needed.  

    Non–teratogenic effects

    Animal reproduction studies showed no evidence of teratogenicity, embryotoxicity, or fetotoxicity when tadalafil was given to pregnant rats or mice at unbound tadalafil exposures up to 7 times the maximum recommended human dose (MRHD) of 40 mg/day during organogenesis. In one of two perinatal/postnatal developmental studies in rats, postnatal pup survival decreased following maternal exposure to unbound tadalafil concentrations greater than 5 times the MRHD based on AUC. Signs of maternal toxicity occurred at doses greater than 8 times the MRHD based on AUC. Surviving offspring had normal development and reproductive performance [see Nonclinical Toxicology (13.3)].

    8.3 Nursing Mothers

    It is not known whether tadalafil is excreted into human milk. While tadalafil or some metabolite of tadalafil was excreted into rat milk, drug levels in animal breast milk may not accurately predict levels of drug in human breast milk. Because many drugs are excreted in human milk, caution should be exercised when tadalafil is administered to a nursing woman.

    8.4 Pediatric Use

    Safety and effectiveness of tadalafil tablets in pediatric patients have not been established.

    8.5 Geriatric Use

    Of the total number of subjects in the clinical study of tadalafil for pulmonary arterial hypertension, 28 percent were 65 and over, while 8 percent were 75 and over. No overall differences in safety were observed between subjects over 65 years of age compared to younger subjects or those over 75 years of age. No dose adjustment is warranted based on age alone; however, a greater sensitivity to medications in some older individuals should be considered. [See Dosage and Administration (2.2) and Clinical Pharmacology (12.3)].

    8.6 Renal Impairment

    For patients with mild or moderate renal impairment, start tadalafil at 20 mg once daily. Increase the dose to 40 mg once daily based upon individual tolerability [see Dosage and Administration (2.2), Warnings and Precautions (5.3) and Clinical Pharmacology (12.3)].  

    In patients with severe renal impairment, avoid use of tadalafil because of increased tadalafil exposure (AUC), limited clinical experience, and the lack of ability to influence clearance by dialysis [see Warnings and Precautions (5.3) and Clinical Pharmacology (12.3)].

    8.7 Hepatic Impairment

    Because of limited clinical experience in patients with mild to moderate hepatic cirrhosis (Child-Pugh Class A or B), consider a starting dose of tadalafil 20 mg once daily. Patients with severe hepatic cirrhosis (Child-Pugh Class C) have not been studied, thus avoid use of tadalafil in such patients [see Dosage and Administration (2.2), Warnings and Precautions (5.4) and Clinical Pharmacology (12.3)].

  • 10 OVERDOSAGE

    Single doses up to 500 mg have been given to healthy male subjects, and multiple daily doses up to 100 mg have been given to male patients with erectile dysfunction. Adverse reactions were similar to those seen at lower doses. Doses greater than 40 mg have not been studied in patients with pulmonary arterial hypertension. In cases of overdose, standard supportive measures should be adopted as needed. Hemodialysis contributes negligibly to tadalafil elimination.

  • 11 DESCRIPTION

    Tadalafil USP, an oral treatment for pulmonary arterial hypertension, is a selective inhibitor of cyclic guanosine monophosphate (cGMP)–specific phosphodiesterase type 5 (PDE5). Tadalafil USP has the molecular formula C22H19N3O4 representing a molecular weight of 389.41. The structural formula is:

    structure

    The chemical designation is pyrazino[1´,2´:1,6]pyrido[3,4–b]indole-1,4-dione, 6-(1,3-benzodioxol-5-yl)2,3,6,7,12,12a-hexahydro-2-methyl-, (6R,12aR)-. It is white to almost white powder that is freely soluble in dimethylsulfoxide, slightly soluble in methylene chloride and practically insoluble in water.

    Tadalafil tablets, USP are available as oval shaped, biconvex, yellow colored, film-coated tablet for oral administration. Each tablet contains 20 mg of tadalafil USP and the following inactive ingredients: anhydrous lactose, croscarmellose sodium, hypromellose, iron oxide yellow, magnesium stearate, microcrystalline cellulose, poloxamer, sodium lauryl sulfate, talc, titanium dioxide, and triacetin.

    USP Dissolution Test Pending.

  • 12 CLINICAL PHARMACOLOGY

    12.1 Mechanism of Action

    Tadalafil is an inhibitor of phosphodiesterase type 5 (PDE5), the enzyme responsible for the degradation of cyclic guanosine monophosphate (cGMP). Pulmonary arterial hypertension is associated with impaired release of nitric oxide by the vascular endothelium and consequent reduction of cGMP concentrations in the pulmonary vascular smooth muscle. PDE5 is the predominant phosphodiesterase in the pulmonary vasculature. Inhibition of PDE5 by tadalafil increases the concentrations of cGMP resulting in relaxation of pulmonary vascular smooth muscle cells and vasodilation of the pulmonary vascular bed.  

    Studies in vitro have demonstrated that tadalafil is a selective inhibitor of PDE5. PDE5 is found in pulmonary vascular smooth muscle, visceral smooth muscle, corpus cavernosum, skeletal muscle, platelets, kidney, lung, cerebellum, and pancreas.  

    In vitro studies have shown that the effect of tadalafil is more potent on PDE5 than on other phosphodiesterases. These studies have shown that tadalafil is >10,000–fold more potent for PDE5 than for PDE1, PDE2, PDE4, and PDE7 enzymes, which are found in the heart, brain, blood vessels, liver, leukocytes, skeletal muscle, and other organs. Tadalafil is >10,000–fold more potent for PDE5 than for PDE3, an enzyme found in the heart and blood vessels. Additionally, tadalafil is 700–fold more potent for PDE5 than for PDE6, which is found in the retina and is responsible for phototransduction. Tadalafil is >9,000-fold more potent for PDE5 than for PDE8, PDE9, and PDE10. Tadalafil is 14–fold more potent for PDE5 than for PDE11A1 and 40–fold more potent for PDE5 than for PDE11A4, two of the four known forms of PDE11. PDE11 is an enzyme found in human prostate, testes, skeletal muscle and in other tissues. In vitro, tadalafil inhibits human recombinant PDE11A1 and, to a lesser degree, PDE11A4 activities at concentrations within the therapeutic range. The physiological role and clinical consequence of PDE11 inhibition in humans have not been defined.

    12.2 Pharmacodynamics

    Effects on Blood Pressure When Administered with Nitrates

    In clinical pharmacology studies, tadalafil (5 to 20 mg) was shown to potentiate the hypotensive effect of nitrates. Do not use tadalafil in patients taking any form of nitrates [see Contraindications (4.1)].  

    A double–blind, placebo–controlled, crossover study in 150 male subjects at least 40 years of age (including subjects with diabetes mellitus and/or controlled hypertension) assessed the interaction between nitroglycerin and tadalafil. Subjects received daily doses of tadalafil 20 mg or matching placebo for 7 days and then were given a single dose of 0.4 mg sublingual nitroglycerin (NTG) at pre–specified timepoints following their last dose of tadalafil (2, 4, 8, 24, 48, 72, and 96 hours after tadalafil). A significant interaction between tadalafil and NTG was observed at each timepoint up to and including 24 hours. At 48 hours, by most hemodynamic measures, the interaction between tadalafil and NTG was not observed, although a few more tadalafil subjects compared to placebo experienced greater blood–pressure lowering effects at this timepoint. After 48 hours, the interaction was not detectable. [See Contraindications (4.1) and Warnings and Precautions (5.1)].

    Effects on Blood Pressure

    Tadalafil 20 mg administered to healthy male subjects produced no significant difference compared to placebo in supine systolic and diastolic blood pressure (difference in the mean maximal decrease of 1.6/0.8 mm Hg, respectively) and in standing systolic and diastolic blood pressure (difference in the mean maximal decrease of 0.2/4.6 mm Hg, respectively). In addition, there was no significant effect on heart rate.  

    Effects on Blood Pressure When Administered with Antihypertensives

    Amlodipine — A study assessed the interaction between amlodipine (5 mg daily) and tadalafil 10 mg. There was no effect of tadalafil on amlodipine blood levels and no effect of amlodipine on tadalafil blood levels. The mean reduction in supine systolic/diastolic blood pressure because of tadalafil 10 mg in subjects taking amlodipine was 3/2 mm Hg, compared to placebo. In a similar study using tadalafil 20 mg, there were no clinically significant differences between tadalafil and placebo in subjects taking amlodipine.  

    Angiotensin II receptor blockers (with and without other antihypertensives) — A study assessed the interaction between angiotensin II receptor blockers and tadalafil 20 mg. Subjects in the study were taking any marketed angiotensin II receptor blocker, either alone, as a component of a combination product, or as part of a multiple antihypertensive regimen. Following dosing, ambulatory measurements of blood pressure revealed differences between tadalafil and placebo of 8/4 mm Hg in systolic/diastolic blood pressure.  

    Bendroflumethiazide — A study assessed the interaction between bendroflumethiazide (2.5 mg daily) and tadalafil 10 mg. Following dosing, the mean reduction in supine systolic/diastolic blood pressure because of tadalafil 10 mg in subjects taking bendroflumethiazide was 6/4 mm Hg, compared to placebo.  

    Enalapril — A study assessed the interaction between enalapril (10 to 20 mg daily) and tadalafil 10 mg. Following dosing, the mean reduction in supine systolic/diastolic blood pressure because of tadalafil 10 mg in subjects taking enalapril was 4/1 mm Hg, compared to placebo.  

    Metoprolol — A study assessed the interaction between sustained–release metoprolol (25 to 200 mg daily) and tadalafil 10 mg. Following dosing, the mean reduction in supine systolic/diastolic blood pressure because of tadalafil 10 mg in subjects taking metoprolol was 5/3 mm Hg, compared to placebo.  

    Effects on Blood Pressure When Administered with Alcohol

    Alcohol and PDE5 inhibitors, including tadalafil, are mild systemic vasodilators. The interaction of tadalafil with alcohol was evaluated in three clinical pharmacology studies. In two of these, alcohol was administered at a dose of 0.7 grams/kg, which is equivalent to approximately 6 ounces of 80–proof vodka in an 80 kg male, and tadalafil was administered at a dose of 10 mg in one study and 20 mg in another. In both these studies, all patients imbibed the entire alcohol dose within 10 minutes of starting. In one of these two studies, blood alcohol levels of 0.08% were confirmed. In these two studies, more patients had clinically significant decreases in blood pressure on the combination of tadalafil and alcohol as compared to alcohol alone. Some subjects reported postural dizziness, and orthostatic hypotension was observed in some subjects. When tadalafil 20 mg was administered with a lower dose of alcohol (0.6 grams/kg, which is equivalent to approximately 4 ounces of 80–proof vodka, administered in less than 10 minutes), orthostatic hypotension was not observed, dizziness occurred with similar frequency to alcohol alone, and the hypotensive effects of alcohol were not potentiated.  

    Tadalafil did not affect alcohol plasma concentrations and alcohol did not affect tadalafil plasma concentrations.  

    Effects on Blood Pressure When Administered with Alpha-Blockers

    Alpha-blockers and PDE5 inhibitors, including tadalafil, are systemic vasodilators. In subjects receiving concomitant tadalafil (20 mg single dose) and doxazosin (8 mg daily), an alpha-1 adrenergic receptor blocker, there was an augmentation of the blood pressure–lowering effect of doxazosin. This effect was still present at 12 hours postdose and had generally disappeared at 24 hours. The number of subjects with potentially clinically significant standing–blood– pressure decreases was greater for the combination.  

    An additional study was performed with tadalafil (20 mg single dose) and doxazosin (4 and 8 mg daily) using ambulatory blood pressure monitoring. The augmentation appeared unrelated to dosing times and resulted in a greater number of outliers for the combination than had been observed in the previous study. Both of these studies had some symptomatology associated with these blood pressure changes.  

    A further study was carried out with doxazosin (up to 4 mg daily) added to tadalafil (5 mg daily) and there was again an augmentation of response. In this clinical pharmacology study there were symptoms associated with the decrease in blood pressure, including syncope.  

    An interaction study with tadalafil (20 mg single dose) and alfuzosin, also an alpha-1 adrenergic receptor blocker, showed no clinically significant effect on blood pressure.  

    In two clinical pharmacology studies in healthy volunteers, tadalafil (5 mg daily, and 10 mg and 20 mg single dose) had no clinically significant effect on blood pressure changes because of tamsulosin, a selective alpha-1a adrenergic receptor blocking agent.  

    Effects on Cardiac Electrophysiology

    The effect of a single 100 mg dose of tadalafil (2.5 times the recommended dose) on the QT interval was evaluated at the time of peak tadalafil concentration in a randomized, double–blinded, placebo, and active–controlled (intravenous ibutilide) crossover study in 90 healthy males aged 18 to 53 years. The mean change in QTc (Fridericia QT correction) for tadalafil, relative to placebo, was 3.5 milliseconds (two–sided 90% CI=1.9, 5.1). The mean change in QTc (Individual QT correction) for tadalafil, relative to placebo, was 2.8 milliseconds (two–sided 90% CI=1.2, 4.4). In this study, the mean increase in heart rate associated with a 100 mg dose of tadalafil compared to placebo was 3.1 beats per minute.  

    Effects on Exercise Stress Testing

    The effects of tadalafil on cardiac function, hemodynamics, and exercise tolerance were investigated in a single clinical pharmacology study. In this blinded crossover trial, 23 subjects with stable coronary artery disease and evidence of exercise–induced cardiac ischemia were enrolled. The primary endpoint was time to cardiac ischemia. The mean difference in total exercise time was 3 seconds (tadalafil 10 mg minus placebo), which represented no clinically meaningful difference. Further statistical analysis demonstrated that tadalafil was similar to placebo with respect to time to ischemia. Of note, in this study, in some subjects who received tadalafil followed by sublingual nitroglycerin in the post– exercise period, clinically significant reductions in blood pressure were observed, consistent with the augmentation by tadalafil of the blood–pressure–lowering effects of nitrates.  

    Effects on Vision

    Single oral doses of PDE inhibitors have demonstrated transient dose-related impairment of color discrimination (blue/green), using the Farnsworth–Munsell 100–hue test, with peak effects near the time of peak plasma levels. This finding is consistent with the inhibition of PDE6, which is involved in phototransduction in the retina. In a study to assess the effects of a single dose of tadalafil 40 mg on vision (N=59), no effects were observed on visual acuity, intraocular pressure, or pupillometry. Across all clinical studies with tadalafil, reports of changes in color vision were rare (<0.1% of patients).  

    Effects on Sperm Characteristics

    Three studies were conducted in men to assess the potential effect on sperm characteristics of tadalafil 10 mg (one 6-month study) and 20 mg (one 6-month and one 9-month study) administered daily. There were no adverse effects on sperm morphology or sperm motility in any of the three studies. In the study of 10 mg tadalafil for 6 months and the study of 20 mg tadalafil for 9 months, results showed a decrease in mean sperm concentrations relative to placebo, although these differences were not clinically meaningful. This effect was not seen in the study of 20 mg tadalafil taken for 6 months. In addition there was no adverse effect on mean concentrations of reproductive hormones, testosterone, luteinizing hormone or follicle stimulating hormone with either 10 or 20 mg of tadalafil compared to placebo.  

    Dose-Response Relationship

    Dose-response relationships, between 20 mg and 40 mg, were not observed for 6-minute walk distance or pulmonary vascular resistance (PVR) in subjects with PAH in the placebo-controlled study. Median change from baseline in 6-minute walk distance was 32 meters and 35 meters at 16 weeks in subjects receiving 20 mg and 40 mg daily, respectively. Mean change from baseline PVR was -254 dynes*sec*cm-5 and -209 dynes*sec*cm-5 at 16 weeks in patients receiving 20 mg and 40 mg daily, respectively.

    12.3 Pharmacokinetics

    Over a dose range of 2.5 to 20 mg, tadalafil exposure (AUC) increases proportionally with dose in healthy subjects. In PAH patients administered between 20 and 40 mg of tadalafil, an approximately 1.5-fold greater AUC was observed indicating a less than proportional increase in exposure over the entire dose range of 2.5 to 40 mg. During tadalafil 20 and 40 mg once daily dosing, steady-state plasma concentrations were attained within 5 days, and exposure was approximately 1.3-fold higher than after a single dose.

    Absorption — After single oral-dose administration, the maximum observed plasma concentration (Cmax) of tadalafil is achieved between 2 and 8 hours (median time of 4 hours). Absolute bioavailability of tadalafil following oral dosing has not been determined.  

    The rate and extent of absorption of tadalafil are not influenced by food; thus tadalafil may be taken with or without food.  

    Distribution — The mean apparent volume of distribution following oral administration is approximately 77 L, indicating that tadalafil is distributed into tissues. At therapeutic concentrations, 94% of tadalafil in plasma is bound to proteins.  

    Metabolism — Tadalafil is predominantly metabolized by CYP3A to a catechol metabolite. The catechol metabolite undergoes extensive methylation and glucuronidation to form the methylcatechol and methylcatechol glucuronide conjugate, respectively. The major circulating metabolite is the methylcatechol glucuronide. Methylcatechol concentrations are less than 10% of glucuronide concentrations. In vitro data suggests that metabolites are not expected to be pharmacologically active at observed metabolite concentrations.  

    Elimination — Following 40 mg, the mean oral clearance for tadalafil is 3.4 L/hr and the mean terminal half-life is 15 hours in healthy subjects. In patients with pulmonary hypertension not receiving concomitant bosentan, the mean oral clearance for tadalafil is 1.6 L/hr, and the mean terminal half-life is 35 hours. Tadalafil is excreted predominantly as metabolites, mainly in the feces (approximately 61% of the dose) and to a lesser extent in the urine (approximately 36% of the dose).  

    Population pharmacokinetics — In patients with pulmonary hypertension not receiving concomitant bosentan, the average tadalafil exposure at steady-state following 40 mg was 26% higher when compared to those of healthy volunteers. The results suggest a lower clearance of tadalafil in patients with pulmonary hypertension compared to healthy volunteers.  

    Geriatric patients

    In healthy male elderly subjects (65 years or over) after a 10 mg dose, a lower oral clearance of tadalafil, resulting in 25% higher exposure (AUC) with no effect on Cmax was observed relative to that in healthy subjects 19 to 45 years of age.  

    Renal impairment

    In clinical pharmacology studies using single-dose tadalafil (5 to 10 mg), tadalafil exposure (AUC) doubled in subjects with mild (creatinine clearance 51 to 80 mL/min) or moderate (creatinine clearance 31 to 50 mL/min) renal impairment. In subjects with end-stage renal disease on hemodialysis, there was a two-fold increase in Cmax and 2.7- to 4.1-fold increase in AUC following single-dose administration of 10 or 20 mg tadalafil, respectively. Exposure to total methylcatechol (unconjugated plus glucuronide) was 2- to 4-fold higher in subjects with renal impairment, compared to those with normal renal function. Hemodialysis (performed between 24 and 30 hours post-dose) contributed negligibly to tadalafil or metabolite elimination [see Dosage and Administration (2.2) and Warnings and Precautions (5.3)].

    Hepatic impairment

    In clinical pharmacology studies, tadalafil exposure (AUC) in subjects with mild or moderate hepatic impairment (Child-Pugh Class A or B) was comparable to exposure in healthy subjects when a dose of 10 mg was administered. There are no available data for doses higher than 10 mg of tadalafil in patients with hepatic impairment. Insufficient data are available for subjects with severe hepatic impairment (Child-Pugh Class C) [see Dosage and Administration (2.2) and Warnings and Precautions (5.4)].  

    Patients with diabetes mellitus

    In male patients with diabetes mellitus after a 10 mg tadalafil dose, exposure (AUC) was reduced approximately 19% and Cmax was 5% lower than that observed in healthy subjects. No dose adjustment is warranted.  

    Race

    Pharmacokinetic studies have included subjects from different ethnic groups, and no differences in the typical exposure to tadalafil have been identified. No dose adjustment is warranted.  

    Gender

    In healthy female and male subjects following single and multiple-doses of tadalafil, no clinically relevant differences in exposure (AUC and Cmax) were observed. No dose adjustment is warranted.  

    Drug interaction studies

    Tadalafil is a substrate of and predominantly metabolized by CYP3A. Drugs that inhibit CYP3A can increase tadalafil exposure.  

    Ritonavir

    Ritonavir (500 mg or 600 mg twice daily at steady state), an inhibitor of CYP3A, CYP2C9, CYP2C19, and CYP2D6, increased tadalafil 20 mg single-dose exposure (AUC) by 32% with a 30% reduction in Cmax, relative to the values for tadalafil 20 mg alone. Ritonavir (200 mg twice daily), increased tadalafil 20 mg single-dose exposure (AUC) by 124% with no change in Cmax, relative to the values for tadalafil 20 mg alone. Ritonavir inhibits and induces CYP3A, the enzyme involved in the metabolism of tadalafil, in a time-dependent manner. The results suggest the initial inhibitory effect of ritonavir on CYP3A may be mitigated by a more slowly evolving induction effect so that after about 1 week of ritonavir twice daily, the exposure of tadalafil is similar in the presence of and absence of ritonavir [see Dosage and Administration (2.3), Warnings and Precautions (5.2), and Drug Interactions (7.2)]. Although specific interactions have not been studied, other HIV protease inhibitors would likely increase tadalafil exposure.  

    Other Cytochrome P450 inhibitors

    CYP3A (e.g., ketoconazole) — Ketoconazole (400 mg daily), a selective and potent inhibitor of CYP3A, increased tadalafil 20 mg single-dose exposure (AUC) by 312% and Cmax by 22%, relative to the values for tadalafil 20 mg alone. Ketoconazole (200 mg daily) increased tadalafil 10–mg single-dose exposure (AUC) by 107% and Cmax by 15%, relative to the values for tadalafil 10 mg alone.

    Although specific interactions have not been studied, other CYP3A inhibitors, such as erythromycin, itraconazole, and grapefruit juice, would likely increase tadalafil exposure.  

    Cytochrome P450 inducers

    CYP3A (e.g., rifampin, bosentan) — Rifampin (600 mg daily), a CYP3A inducer, reduced tadalafil 10 mg single– dose exposure (AUC) by 88% and Cmax by 46%, relative to the values for tadalafil 10 mg alone.  

    Bosentan (125 mg twice daily), a substrate of CYP2C9 and CYP3A and a moderate inducer of CYP3A, CYP2C9 and possibly CYP2C19, reduced tadalafil (40 mg once per day) systemic exposure by 42% and Cmax by 27% following multiple-dose co-administration.  

    Although specific interactions have not been studied, other CYP3A inducers, such as carbamazepine, phenytoin, and phenobarbital, would likely decrease tadalafil exposure.  

    Cytochrome P450 substrates — Tadalafil is not expected to cause clinically significant inhibition or induction of the clearance of drugs metabolized by cytochrome P450 (CYP) isoforms.  

    CYP1A2 (e.g., theophylline) — Tadalafil (10 mg once per day) had no significant effect on the pharmacokinetics of theophylline. When tadalafil was administered to subjects taking theophylline, a small augmentation (3 beats per minute) of the increase in heart rate associated with theophylline was observed.  

    CYP2C9 (e.g., warfarin) — Tadalafil (10 mg and 20 mg once per day) had no significant effect on exposure (AUC) to S–warfarin or R–warfarin, nor did tadalafil affect changes in prothrombin time induced by warfarin.  

    CYP3A (e.g., midazolam, lovastatin or bosentan) — Tadalafil (10 mg and 20 mg once per day) had no significant effect on exposure (AUC) to midazolam or lovastatin. Tadalafil (40 mg once per day) had no clinically significant effect on exposure (AUC and Cmax) of bosentan, a substrate of CYP2C9 and CYP3A, or its metabolites.  

    Aspirin — Tadalafil (10 mg and 20 mg once per day) did not potentiate the increase in bleeding time caused by aspirin.  

    P-glycoprotein (e.g., digoxin) — Coadministration of tadalafil (40 mg once per day) for 10 days did not have a significant effect on the steady-state pharmacokinetics of digoxin (0.25 mg/day) in healthy subjects.  

    Combined oral contraceptives — At steady-state, tadalafil (40 mg once per day) increased ethinyl estradiol exposure (AUC) by 26% and Cmax by 70% relative to oral contraceptive administered with placebo. There was no significant effect of tadalafil on levonorgestrel.  

    Antacids — Simultaneous administration of an antacid (magnesium hydroxide/aluminum hydroxide) and tadalafil (10 mg) reduced the apparent rate of absorption of tadalafil without altering exposure (AUC) to tadalafil.

    H2 antagonists (e.g., nizatidine) — An increase in gastric pH resulting from administration of nizatidine had no significant effect on tadalafil (10 mg) pharmacokinetics.

  • 13 NONCLINICAL TOXICOLOGY

    13.1 Carcinogenesis, Mutagenesis, Impairment Of Fertility

    Carcinogenesis — Tadalafil was not carcinogenic to rats or mice when administered daily for 2 years at doses up to 400 mg/kg/day. Systemic drug exposures, as measured by AUC of unbound tadalafil, were approximately 5–fold for mice, and 7– and 14–fold for male and female rats, respectively, the exposures at the maximum recommended human dose (MRHD) of 40 mg.  

    Mutagenesis — Tadalafil was not mutagenic in the in vitro bacterial Ames assays or the forward mutation test in mouse lymphoma cells. Tadalafil was not clastogenic in the in vitro chromosomal aberration test in human lymphocytes or the in vivo rat micronucleus assays.  

    Impairment of Fertility — There were no effects on fertility, reproductive performance or reproductive organ morphology in male or female rats given oral doses of tadalafil up to 400 mg/kg/day, a dose producing AUCs for unbound tadalafil of 6–fold for males or 17–fold for females the exposures at the MRHD of 40 mg. In beagle dogs given tadalafil daily for 3 to 12 months, there was treatment–related non–reversible degeneration and atrophy of the seminiferous tubular epithelium in the testes in 20 to 100% of the dogs that resulted in a decrease in spermatogenesis in 40 to 75% of the dogs at doses of ≥10 mg/kg/day. Systemic exposure (based on AUC) at no–observed–adverse-effect–level (NOAEL) (10 mg/kg/day) for unbound tadalafil was similar to that expected in humans at the MRHD of 40 mg.  

    There were no treatment–related testicular findings in rats or mice treated with doses up to 400 mg/kg/day for 2 years.

    13.2 Animal Pharmacology and/or Toxicology

    Animal studies showed vascular inflammation in tadalafil–treated mice, rats, and dogs. In mice and rats, lymphoid necrosis and hemorrhage were seen in the spleen, thymus, and mesenteric lymph nodes at unbound tadalafil exposure of 1– to 17–fold the human exposure (AUCs) at the MRHD of 40 mg. In dogs, an increased incidence of disseminated arteritis was observed in 1– and 6-month studies at unbound tadalafil exposure of 0.5– to 38–fold the human exposure (AUC) at the MRHD of 40 mg. In a 12–month dog study, no disseminated arteritis was observed, but 2 dogs exhibited marked decreases in white blood cells (neutrophils) and moderate decreases in platelets with inflammatory signs at unbound tadalafil exposures of approximately 4– to 10–fold the human exposure at the MRHD of 40 mg. The abnormal blood–cell findings were reversible within 2 weeks upon removal of the drug.

    13.3 Reproductive Toxicology Studies

    Reproduction studies have been performed in rats and mice at exposures up to 17 times the MRHD of 40 mg and have revealed no evidence of impaired fertility or harm to the fetus because of tadalafil. In addition, there was no evidence of teratogenicity, embryotoxicity, or fetotoxicity when tadalafil was given to pregnant rats or mice at exposures up to 7 times the MRHD during the period of major organ development.

    In a rat prenatal and postnatal development study at doses of 60, 200, and 1,000 mg/kg, a reduction in postnatal survival of pups was observed. The no-observed-effect-level (NOEL) for maternal toxicity was 200 mg/kg/day and for developmental toxicity was 30 mg/kg/day. This gives approximately 8- and 5-fold exposure multiples, respectively, of the human AUC for the MRHD of 40 mg. Tadalafil and/or its metabolites cross the placenta, resulting in fetal exposure in rats.  

    Tadalafil and/or its metabolites were secreted into the milk in lactating rats at concentrations approximately 2.4– fold greater than found in the plasma.

  • 14 CLINICAL STUDIES

    14.1 Tadalafil for Pulmonary Arterial Hypertension

    A randomized, double-blind, 16 week placebo-controlled study was conducted in 405 patients with pulmonary arterial hypertension, defined as a resting mean pulmonary artery pressure (mPAP) ≥25 mm Hg, pulmonary capillary wedge pressure (PCWP) ≤15 mm Hg, and pulmonary vascular resistance (PVR) ≥3 Wood units via right heart catheterization. Allowed background therapy included bosentan (maintenance dosing up to 125 mg twice daily) and chronic anticoagulation. The use of prostacyclin or analogue, L–arginine, phosphodiesterase inhibitor, or other chronic PAH medications were not permitted.  

    Subjects were randomly assigned to 1 of 5 treatment groups (tadalafil 2.5, 10, 20, 40 mg, or placebo) in a 1:1:1:1:1 ratio. Subjects had to be at least 12 years of age and had a diagnosis of PAH that was idiopathic, heritable, related to connective tissue disease, anorexigen use, human immunodeficiency virus (HIV) infection, associated with an atrial-septal defect, or associated with surgical repair of a congenital systemic-to-pulmonary shunt of least 1 year in duration (for example, ventricular septal defect, patent ductus arteriosus). Patients with a history of left-sided heart disease, severe renal insufficiency, or pulmonary hypertension related to conditions other than specified in the inclusion criteria were not eligible for enrollment.  

    The mean age of all subjects was 54 years (range 14 to 90 years) with the majority of subjects being Caucasian (81%) and female (78%). PAH etiologies were predominantly idiopathic or heritable PAH (61%) and related to connective tissue disease (23%). More than half (53%) of the subjects in the study were receiving concomitant bosentan therapy. The majority of subjects had a World Health Organization (WHO) Functional Class III (65%) or II (32%). The mean baseline 6 minute walk distance (6-MWD) was 343 meters. Of the 405 subjects, 341 completed the study. The primary efficacy endpoint was the change from baseline at week 16 in 6-MWD (see Figure 1). In the tadalafil 40 mg treatment group, the placebo-adjusted mean change increase in 6-MWD was 33 meters (95% C.I. 15 to 50 meters; p=0.0004). The improvement in 6-MWD was apparent at 8 weeks of treatment and then maintained at week 12 and week 16.

    figure1

    Figure 1: 6-Minute Walk Distance (meters) Mean Change from Baseline, with 95% Confidence Intervals

    Placebo-adjusted changes in 6-MWD at 16 weeks were evaluated in subgroups (see Figure 2). In patients taking only tadalafil 40 mg (i.e., without concomitant bosentan), the placebo-adjusted mean change in 6-MWD was 44 meters. In patients taking tadalafil 40 mg and concomitant bosentan therapy, the placebo adjusted mean change in 6-MWD was 23 meters.

    figure2

    * Placebo-adjusted Mean Change in 6 Minute Walk Distance (meters) of Tadalafil 40 mg with 95% Confidence Intervals  

    Repaired S-P Shunts=Repaired Congenital systemic-to-pulmonary shunt.

    Figure 2: Placebo-adjusted Mean Change in 6-Minute Walk Distance (meters) of Tadalafil 40 mg, with 95% Confidence Intervals

    There was less clinical worsening (defined as death, lung transplantation, atrial septostomy, hospitalization because of worsening PAH, initiation of new PAH therapy [prostacyclin or analog, endothelin receptor antagonist, PDE5inhibitor], or worsening WHO functional class) in the tadalafil 40 mg group compared to the placebo group and the groups that used lower doses of tadalafil.

    Table 2: Number (percent) with Clinical Worseninga

        Tadalafil      
      Placebo
    N=82    		2.5 mg
    N=82    		10 mg
    N=80    		20 mg
    N=82    		40 mg
    N=79
    Total with clinical worsening 13 (16) 10 (12) 7 (9) 8 (10) 4 (5)
    Death 1 0 1 0 0
    Hospitalization for worsening PAH 2 2 3 0 1
    New PAH therapy 0 1 0 2 1
    Worsening WHO class 11 10 6 6 3

    a Subjects may be counted in more than one category   The Kaplan-Meier plot of times to clinical worsening is shown below in

    Figure 3.

    figure3

    Figure 3: Kaplan-Meier Plot of Time to Clinical Worsening

    14.2 Long-Term Treatment of Pulmonary Arterial Hypertension

    Patients (N=357) from the placebo-controlled study entered a long-term extension study. Of these, 311 patients have been treated with tadalafil for at least 6 months and 182 for 1 year (median exposure 356 days; range 2 days to 415 days). The survival rate in the extension study was 96.5 per 100 patient years. Without a control group, these data must be interpreted cautiously.

  • 16 HOW SUPPLIED/STORAGE AND HANDLING

    16.1 How Supplied

    Tadalafil tablets, USP are supplied as follows: 20 mg, oval shaped, biconvex, yellow colored, film-coated tablet, debossed with image2 on one side and plain on other side.

    Bottles of 30 NDC: 43598-578-30

    Bottles of 60 NDC: 43598-578-60

    16.2 Storage

    Store at 20ºC to 25ºC (68ºF to 77ºF); [See USP Controlled Room Temperature]. Keep out of reach of children.

  • 17 PATIENT COUNSELING INFORMATION

    See FDA-Approved Patient Labeling (Patient Information)  

    Inform patients of contraindication of tadalafil with any use of organic nitrates or GC stimulators.

    Inform patients that tadalafil is also marketed as CIALIS for erectile dysfunction (ED) and for the signs and symptoms of benign prostatic hyperplasia (BPH). Advise patients taking tadalafil tablets not to take CIALIS or other PDE5 inhibitors.

    Advise patients to seek immediate medical attention in the event of a sudden loss of vision in one or both eyes while taking tadalafil. Such an event may be a sign of NAION.

    Advise patients to seek prompt medical attention in the event of sudden decrease or loss of hearing while taking tadalafil. These events may be accompanied by tinnitus and dizziness.  

    Rx Only  

    Distributor:

    Dr. Reddy’s Laboratories Inc.,

    Princeton, NJ 08540  

    Made in India 

  • PATIENT INFORMATION

    Tadalafil Tablets, USP

    (ta DAL a fil)

    Read this patient information before you start taking tadalafil tablets and each time you get a refill. There may be new information. This information does not take the place of talking with your healthcare provider about your medical condition or treatment.

    What is the most important information I should know about tadalafil tablets? 

    Never take tadalafil tablets with any nitrate or guanylate cyclase stimulator medicines:

    Your blood pressure could drop quickly to an unsafe level

    You could get dizzy, faint and even have a heart attack or stroke.

    Nitrates include:

    Medicines that treat chest pain (angina)

    Nitroglycerin in any form including tablets, patches, sprays, and ointments

    Other nitrate medicines (isosorbide mononitrate or dinitrate)

    Street drugs that are inhaled, called “poppers” (amyl nitrate, butyl nitrate or nitrite)

    Guanylate cyclase stimulators include:

    Riociguat (Adempas®) a medicine that treats pulmonary arterial hypertension and chronic-thromboembolic pulmonary hypertension

    Ask your healthcare provider or pharmacist if you are not sure if you take a nitrate or guanylate cyclase stimulator medicine.

    What is tadalafil?

    Tadalafil is a prescription medicine used to treat pulmonary arterial hypertension (PAH, high blood pressure in your lungs) to improve your ability to exercise.

    It is not known if tadalafil tablets are safe or effective in children.

    Who should not take tadalafil tablets? Do not take tadalafil tablets if you

    take any medicines called nitrates.

    use recreational drugs called “poppers” like amyl nitrate, butyl nitrate or nitrite.

    take any medicines called guanylate cyclase stimulators

    are allergic to tadalafil or any other ingredient in tadalafil tablets. See “What are the ingredients in tadalafil tablets?” at the end of this leaflet.

    See “What is the most important information I should know about tadalafil tablets?”  

    What should I tell my healthcare provider before taking tadalafil tablets?

    Before taking tadalafil tablets, tell your healthcare provider about all of your medical conditions, including if you:

    are allergic to tadalafil tablets or CIALIS or any of its ingredients. See the end of this leaflet for a complete list of ingredients in tadalafil tablets.

    have pulmonary veno-occlusive disease (PVOD)

    have heart problems such as angina (chest pain), heart failure, irregular heartbeats, or have had a heart attack

    have low blood pressure or high blood pressure that is not controlled

    have had a stroke

    have liver problems

    have kidney problems or get dialysis

    have stomach ulcers

    have retinitis pigmentosa, a rare genetic eye disease

    have ever had any sudden vision loss, including any damage to your optic nerve or NAION.

    have ever had hearing problems such as ringing in the ears, dizziness, or loss of hearing

    have a deformed penis shape or Peyronie’s disease

    have had an erection that lasted more than 4 hours

    have blood cell problems such as sickle cell anemia, multiple myeloma, or leukemia

    are pregnant or planning to become pregnant. It is not known if tadalafil will harm your unborn baby. Talk to your healthcare provider if you are pregnant or plan to become pregnant.

    are breastfeeding or plan to breast feed. It is not known if tadalafil passes into your breast milk. You and your healthcare provider should decide if you will take tadalafil or breastfeed. You should not do both.

    Tell your healthcare provider about all the medicines you take, including prescription and non-prescription medicines, vitamins, and herbal supplements. Tadalafil and other medicines may affect each other.

    Especially tell your healthcare provider if you take any of these medicines*:

    nitrates or guanylate cyclase stimulators (see “What is the most important information I should know about tadalafil tablets?”)

    anti-hypertensives, used to treat high blood pressure. Your blood pressure could suddenly drop. You could get dizzy or faint.

    alpha blockers, used to treat prostate disease and high blood pressure. Your blood pressure could suddenly drop. You could get dizzy or faint.

    protease inhibitors, used to treat HIV infection, such as ritonavir (Norvir®, Kaletra®)

    ketoconazole (Extina®, Xolegel®, Ketozole®, Nizoral A-D®, Nizoral®) itraconazole (Sporanox®)

    erythromycin (several brand names exist. Please consult your healthcare provider to determine if you are taking this medicine)

    rifampin (Rifadin®, Rifamate®, Rifater®, Rimactane®)

    bosentan (Tracleer®)

    phenobarbital, phenytoin (Dilantin®), carbamazepine (Tegretol®)

    CIALIS® or other medicines or treatments for erectile dysfunction (impotence).

    Tadalafil tablets are also marketed as CIALIS for the treatment of male erectile dysfunction (ED, impotence) and for the signs and symptoms of benign prostatic hyperplasia (BPH, enlarged prostate). Do not take both tadalafil tablets and CIALIS. Do not take tadalafil tablets and other medicines or treatments for erectile dysfunction.

    Ask your healthcare provider or pharmacist for a list of these medicines, if you are not sure.

    Know the medicines you take. Keep a list of them and show it to your healthcare provider and pharmacist when you get a new medicine.

    How should I take tadalafil tablets?

    Take tadalafil tablets exactly as your healthcare provider tells you.

    Take tadalafil tablets at the same time every day. You should take both tablets at the same time, one after the other, every day. Do not split your dose.

    Tadalafil tablets can be taken with or without food.

    Do not change your dose or stop taking tadalafil tablets without speaking to your healthcare provider.

    If you take too much tadalafil tablets, call your healthcare provider or go to an emergency department right away.

    What should I avoid while taking tadalafil tablets?

    Do not have more than 4 alcohol-containing drinks in a short period of time while you take tadalafil tablets. Drinking too much alcohol can lower your blood pressure. You could get dizzy or faint.  

    What are the possible side effects of tadalafil tablets?  

    The following side effects were reported rarely in patients taking tadalafil tablets:

    Decreased eyesight or loss of vision in one or both eyes (NAION). If you notice a sudden decrease or loss of vision in one or both eyes, contact a healthcare provider right away.

    Sudden decrease or loss of hearing, sometimes with ringing in the ears and dizziness. If you notice a sudden decrease or loss of hearing, contact a healthcare provider right away.

    In men, an erection that lasts more than 4 hours (with or without pain). Talk to your healthcare provider or go to the emergency department right away. An erection that lasts more than 4 hours must be treated as soon as possible or you can have lasting damage to your penis, including the inability to have erections.

    See “What is the most important information I should know about tadalafil tablets?”  

    The most common side effects with tadalafil include:

    headache

    muscle pain

    getting red or hot in the face (flushing)

    nausea

    pain in the arms, legs, or back

    upset stomach

    stuffy or congested nose

    Tell your healthcare provider about any side effect that bothers you or does not go away.

    These are not all the possible side effects of tadalafil tablets. For more information, ask your healthcare provider or pharmacist. 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 tadalafil tablets?

    Store tadalafil tablets at room temperature between 20ºC to 25ºC (68ºF to 77ºF).

    Keep tadalafil tablets and all medicines out of the reach of children. 

    General Information about the safe and effective use of tadalafil tablets

    Medicines are sometimes prescribed for conditions that are not mentioned in patient information leaflets. Do not use tadalafil for a condition for which it was not prescribed. Do not give tadalafil tablets to other people, even if they have the same symptoms you have. It may harm them.

    This patient information leaflet summarizes the most important information about tadalafil. If you would like more information, talk with your healthcare provider. You can ask your healthcare provider or pharmacist for information about tadalafil that is written for healthcare professionals. For more information, call Dr. Reddy’s Laboratories, Inc. at 1-888-375-3784.

    What Are The Ingredients In tadalafil tablets?

    Active Ingredient: tadalafil

    Inactive Ingredients: anhydrous lactose, croscarmellose sodium, hypromellose, iron oxide yellow, magnesium stearate, microcrystalline cellulose, poloxamer, sodium lauryl sulfate, talc, titanium dioxide, and triacetin.

    *The brands listed are trademarks of their respective owners and are not trademarks of Dr. Reddys Laboratories Limited. The makers of these brands are not affiliated with and do not endorse Dr. Reddys Laboratories Limited or its products.

    To reorder additional Patient Information sheets, contact Dr. Reddy’s Customer Service at 1-866-733-3952.

    Rx Only

    Distributor:

    Dr. Reddy’s Laboratories Inc.,

    Princeton, NJ 08540

    Made in India

  • PACKAGE LABEL PRINCIPAL DISPLAY PANEL SECTION

    Tadalafil Tablets USP, 20 mg - Container Label 60's Count

    Unvarnished Area consists of: 2D Barcode, Lot Number, Expiry Date and Serial Number.

    container

  • INGREDIENTS AND APPEARANCE
    TADALAFIL 
    tadalafil tablet, film coated
    Product Information
    Product TypeHUMAN PRESCRIPTION DRUGItem Code (Source)NDC: 43598-578
    Route of AdministrationORAL
    Active Ingredient/Active Moiety
    Ingredient NameBasis of StrengthStrength
    Tadalafil (UNII: 742SXX0ICT) (Tadalafil - UNII:742SXX0ICT) Tadalafil20 mg
    Inactive Ingredients
    Ingredient NameStrength
    Anhydrous Lactose (UNII: 3SY5LH9PMK)  
    Croscarmellose Sodium (UNII: M28OL1HH48)  
    Hypromellose 2910 (15000 Mpa.S) (UNII: 288VBX44JC)  
    Ferric Oxide Yellow (UNII: EX438O2MRT)  
    Magnesium Stearate (UNII: 70097M6I30)  
    Cellulose, Microcrystalline (UNII: OP1R32D61U)  
    Poloxamer 188 (UNII: LQA7B6G8JG)  
    Sodium Lauryl Sulfate (UNII: 368GB5141J)  
    Talc (UNII: 7SEV7J4R1U)  
    Titanium Dioxide (UNII: 15FIX9V2JP)  
    Triacetin (UNII: XHX3C3X673)  
    Product Characteristics
    ColorYELLOWScoreno score
    ShapeOVAL (oval shaped biconvex) Size13mm
    FlavorImprint Code RDY;20
    Contains    
    Packaging
    #Item CodePackage DescriptionMarketing Start DateMarketing End Date
    1NDC: 43598-578-3030 in 1 BOTTLE; Type 0: Not a Combination Product02/05/2019
    2NDC: 43598-578-6060 in 1 BOTTLE; Type 0: Not a Combination Product02/05/2019
    Marketing Information
    Marketing CategoryApplication Number or Monograph CitationMarketing Start DateMarketing End Date
    ANDAANDA21014502/05/2019
    Labeler - Dr.Reddys Laboratories Inc (802315887)
    Establishment
    NameAddressID/FEIBusiness Operations
    Dr. Reddys Laboratories Limited (SEZ UNIT)860037244analysis(43598-578) , manufacture(43598-578)
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