Gabapentin by Proficient Rx LP GABAPENTIN tablet

Gabapentin by

Drug Labeling and Warnings

Gabapentin by is a Prescription medication manufactured, distributed, or labeled by Proficient Rx LP. Drug facts, warnings, and ingredients follow.

Drug Details [pdf]

  • 1 INDICATIONS AND USAGE

    Gabapentin tablets USP are indicated for:

    • Management of postherpetic neuralgia in adults
    • Adjunctive therapy in the treatment of partial onset seizures, with and without secondary generalization, in adults and pediatric patients 3 years and older with epilepsy
  • 2 DOSAGE AND ADMINISTRATION

    Gabapentin tablets are given orally with or without food. Patients should be informed that, should they break the scored 600 mg or 800 mg tablet in order to administer a half-tablet, they should take the unused half-tablet as the next dose. Half-tablets not used within 28 days of breaking the scored tablet should be discarded.

    If gabapentin tablets dose is reduced, discontinued, or substituted with an alternative medication, this should be done gradually over a minimum of 1 week (a longer period may be needed at the discretion of the prescriber).

    2.1 Postherpetic Neuralgia

    In adults with postherpetic neuralgia, gabapentin tablets therapy may be initiated on Day 1 as a single 300 mg dose, on Day 2 as 600 mg/day (300 mg two times a day), and on Day 3 as 900 mg/day (300 mg three times a day). The dose can subsequently be titrated up as needed for pain relief to a dose of 1800 mg/day (600 mg three times a day). In clinical studies, efficacy was demonstrated over a range of doses from 1800 mg/day to 3600 mg/day with comparable effects across the dose range; however, in these clinical studies, the additional benefit of using doses greater than 1800 mg/day was not demonstrated.

    2.2 Epilepsy with Partial Onset Seizures

    Gabapentin tablets are recommended for add-on therapy in patients 3 years of age and older. Effectiveness in pediatric patients below the age of 3 years has not been established.

    Patients 12 years of age and above: The starting dose is 300 mg three times a day. The effective dose of gabapentin tablets is 300 mg to 600 mg three times a day. Dosages up to 2400 mg/day have been well tolerated in long-term clinical studies. Doses of 3600 mg/day have also been administered to a small number of patients for a relatively short duration, and have been well tolerated. Gabapentin tablets should be administered three times a day using 600 mg or 800 mg tablets. The maximum time between doses should not exceed 12 hours.

    Pediatric Patients Age 3 to 11 years: The starting dose range is 10 mg/kg/day to 15 mg/kg/day, given in three divided doses, and the effective dose reached by upward titration over a period of approximately 3 days. The effective dose of gabapentin tablets in patients 3 to 4 years of age is 40 mg/kg/day, given in three divided doses. The effective dose of gabapentin tablets in patients 5 to 11 years of age is 25 mg/kg/day to 35 mg/kg/day, given in three divided doses. Dosages up to 50 mg/kg/day have been well tolerated in a long-term clinical study. The maximum time interval between doses should not exceed 12 hours.

    It is not necessary to monitor gabapentin plasma concentrations to optimize gabapentin tablets therapy. Further, because there are no significant pharmacokinetic interactions among gabapentin tablets and other commonly used antiepileptic drugs, the addition of gabapentin tablets does not alter the plasma levels of these drugs appreciably.

    If gabapentin tablets are discontinued and/or an alternate anticonvulsant medication is added to the therapy, this should be done gradually over a minimum of 1 week.

    2.3 Patients with Renal Impairment

    Dosage adjustment in patients 12 years of age and older with compromised renal function or undergoing hemodialysis is recommended, as follows (see dosing recommendations above for effective doses in each indication):

    TABLE 1. Gabapentin Tablets Dosage Based on Renal Function

    Renal Function Creatinine Clearance

    (mL/min)

    Total Daily Dose Range

    (mg/day)

    Dose Regimen

    (mg)

    ≥60

    900-3600

    300 TID

    400 TID

    600 TID

    800 TID

    1200 TID

    >30-59

    400-1400

    200 BID

    300 BID

    400 BID

    500 BID

    700 BID

    >15-29

    200-700

    200 QD

    300 QD

    400 QD

    500 QD

    700 QD

    15a

    100-300

    100 QD

    125 QD

    150 QD

    200 QD

    300 QD

    Post-Hemodialysis Supplemental Dose (mg)b

    Hemodialysis

    125b

    150b

    200b

    250b

    350b

    TID = Three times a day; BID = Two times a day; QD = Single daily dose

    a For patients with creatinine clearance <15 mL/min, reduce daily dose in proportion to creatinine clearance (e.g., patients with a creatinine clearance of 7.5 mL/min should receive one-half the daily dose that patients with a creatinine clearance of 15 mL/min receive).

    b Patients on hemodialysis should receive maintenance doses based on estimates of creatinine clearance as indicated in the upper portion of the table and a supplemental post-hemodialysis dose administered after each 4 hours of hemodialysis as indicated in the lower portion of the table.

    Creatinine clearance (CLCr) is difficult to measure in outpatients. In patients with stable renal function, creatinine clearance can be reasonably well estimated using the equation of Cockcroft and Gault:

    Equation 1

    The use of gabapentin tablets in patients less than 12 years of age with compromised renal function has not been studied.

    2.4 Dosage in Elderly

    Because elderly patients are more likely to have decreased renal function, care should be taken in dose selection, and dose should be adjusted based on creatinine clearance values in these patients.

  • 3 DOSAGE FORMS AND STRENGTHS

    Gabapentin Tablets, USP 600 mg: White colored film coated, Modified Capsule shaped,

    biconvex tablets debossed with '1' on the left side of the bisect and '2' on the right side of the bisect on one side and bisect on other.

    Gabapentin Tablets, USP 800 mg: White colored film coated, Modified Capsule shaped,

    biconvex tablets de-bossed with '1' on the left side of the bisect and '3' on the right side of the bisect on one side and bisect on other.

  • 4 CONTRAINDICATIONS

    Gabapentin is contraindicated in patients who have demonstrated hypersensitivity to the drug or its ingredients.

  • 5 WARNINGS AND PRECAUTIONS

    5.1 Drug Reaction with Eosinophilia and Systemic Symptoms (DRESS)/Multiorgan Hypersensitivity

    Drug Reaction with Eosinophilia and Systemic Symptoms (DRESS), also known as multiorgan hypersensitivity, has occurred with gabapentin. Some of these reactions have been fatal or life-threatening. DRESS typically, although not exclusively, presents with fever, rash, and/or lymphadenopathy, in association with other organ system involvement, such as hepatitis, nephritis, hematological abnormalities, myocarditis, or myositis sometimes resembling an acute viral infection. Eosinophilia is often present. This disorder is variable in its expression, and other organ systems not noted here may be involved.

    It is important to note that early manifestations of hypersensitivity, such as fever or lymphadenopathy, may be present even though rash is not evident. If such signs or symptoms are present, the patient should be evaluated immediately. Gabapentin should be discontinued if an alternative etiology for the signs or symptoms cannot be established.

    5.2 Effects on Driving and Operating Heavy Machinery

    Patients taking gabapentin should not drive until they have gained sufficient experience to assess whether gabapentin impairs their ability to drive. Driving performance studies conducted with a prodrug of gabapentin (gabapentin enacarbil tablet, extended release) indicate that gabapentin may cause significant driving impairment. Prescribers and patients should be aware that patients' ability to assess their own driving competence, as well as their ability to assess the degree of somnolence caused by gabapentin, can be imperfect. The duration of driving impairment after starting therapy with gabapentin is unknown. Whether the impairment is related to somnolence [see Warnings and Precautions (5.3)] or other effects of gabapentin is unknown.

    Moreover, because gabapentin causes somnolence and dizziness [see Warnings and Precautions (5.3)], patients should be advised not to operate complex machinery until they have gained sufficient experience on gabapentin to assess whether gabapentin impairs their ability to perform such tasks.

    5.3 Somnolence/Sedation and Dizziness

    During the controlled epilepsy trials in patients older than 12 years of age receiving doses of gabapentin up to 1800 mg daily, somnolence, dizziness, and ataxia were reported at a greater rate in patients receiving gabapentin compared to placebo: i.e., 19% in drug versus 9% in placebo for somnolence, 17% in drug versus 7% in placebo for dizziness, and 13% in drug versus 6% in placebo for ataxia. In these trials somnolence, ataxia and fatigue were common adverse reactions leading to discontinuation of gabapentin in patients older than 12 years of age, with 1.2%, 0.8% and 0.6% discontinuing for these events, respectively.

    During the controlled trials in patients with post-herpetic neuralgia, somnolence and dizziness were reported at a greater rate compared to placebo in patients receiving gabapentin, in dosages up to 3600 mg per day: i.e., 21% in gabapentin-treated patients versus 5% in placebo-treated patients for somnolence and 28% in gabapentin-treated patients versus 8% in placebo-treated patients for dizziness. Dizziness and somnolence were among the most common adverse reactions leading to discontinuation of gabapentin.

    5.4 Withdrawal Precipitated Seizure, Status Epilepticus

    Antiepileptic drugs should not be abruptly discontinued because of the possibility of increasing seizure frequency.

    In the placebo-controlled epilepsy studies in patients >12 years of age, the incidence of status epilepticus in patients receiving gabapentin was 0.6% (3 of 543) vs. 0.5% in patients receiving placebo (2 of 378). Among the 2074 patients >12 years of age treated with gabapentin across all epilepsy studies (controlled and uncontrolled), 31 (1.5%) had status epilepticus. Of these, 14 patients had no prior history of status epilepticus either before treatment or while on other medications. Because adequate historical data are not available, it is impossible to say whether or not treatment with gabapentin is associated with a higher or lower rate of status epilepticus than would be expected to occur in a similar population not treated with gabapentin.

    5.5 Suicidal Behavior and Ideation

    Antiepileptic drugs (AEDs), including gabapentin, increase the risk of suicidal thoughts or behavior in patients taking these drugs for any indication. Patients treated with any AED for any indication should be monitored for the emergence or worsening of depression, suicidal thoughts or behavior, and/or any unusual changes in mood or behavior.

    Pooled analyses of 199 placebo-controlled clinical trials (mono- and adjunctive therapy) of 11 different AEDs showed that patients randomized to one of the AEDs had approximately twice the risk (adjusted Relative Risk 1.8, 95% CI:1.2, 2.7) of suicidal thinking or behavior compared to patients randomized to placebo. In these trials, which had a median treatment duration of 12 weeks, the estimated incidence rate of suicidal behavior or ideation among 27,863 AED-treated patients was 0.43%, compared to 0.24% among 16,029 placebo-treated patients, representing an increase of approximately one case of suicidal thinking or behavior for every 530 patients treated. There were four suicides in drug-treated patients in the trials and none in placebo-treated patients, but the number is too small to allow any conclusion about drug effect on suicide.

    The increased risk of suicidal thoughts or behavior with AEDs was observed as early as one week after starting drug treatment with AEDs and persisted for the duration of treatment assessed. Because most trials included in the analysis did not extend beyond 24 weeks, the risk of suicidal thoughts or behavior beyond 24 weeks could not be assessed.

    The risk of suicidal thoughts or behavior was generally consistent among drugs in the data analyzed. The finding of increased risk with AEDs of varying mechanisms of action and across a range of indications suggests that the risk applies to all AEDs used for any indication. The risk did not vary substantially by age (5–100 years) in the clinical trials analyzed. Table 2 shows absolute and relative risk by indication for all evaluated AEDs.

    TABLE 2.Risk by indication for antiepileptic drugs in the pooled analysis

    Indication

    Placebo Patients with Events Per

    1000 Patients

    Drug Patients

    with Events Per

    1000 Patients

    Relative Risk:

    Incidence of

    Events in Drug

    Patients/Incidence

    in Placebo

    Patients

    Risk Difference:

    Additional Drug

    Patients with

    Events Per 1000

    Patients

    Epilepsy

    1.0

    3.4

    3.5

    2.4

    Psychiatric

    5.7

    8.5

    1.5

    2.9

    Other

    1.0

    1.8

    1.9

    0.9

    Total

    2.4

    4.3

    1.8

    1.9

    The relative risk for suicidal thoughts or behavior was higher in clinical trials for epilepsy than in clinical trials for psychiatric or other conditions, but the absolute risk differences were similar for the epilepsy and psychiatric indications.

    Anyone considering prescribing gabapentin or any other AED must balance the risk of suicidal thoughts or behavior with the risk of untreated illness. Epilepsy and many other illnesses for which AEDs are prescribed are themselves associated with morbidity and mortality and an increased risk of suicidal thoughts and behavior. Should suicidal thoughts and behavior emerge during treatment, the prescriber needs to consider whether the emergence of these symptoms in any given patient may be related to the illness being treated.

    Patients, their caregivers, and families should be informed that AEDs increase the risk of suicidal thoughts and behavior and should be advised of the need to be alert for the emergence or worsening of

    the signs and symptoms of depression, any unusual changes in mood or behavior, or the emergence of suicidal thoughts, behavior, or thoughts about self-harm. Behaviors of concern should be reported immediately to healthcare providers.

    5.6 Neuropsychiatric Adverse Reactions (Pediatric Patients 3–12 Years of Age)

    Gabapentin use in pediatric patients with epilepsy 3–12 years of age is associated with the occurrence of central nervous system related adverse reactions. The most significant of these can be classified into

    the following categories: 1) emotional lability (primarily behavioral problems), 2) hostility, including aggressive behaviors, 3) thought disorder, including concentration problems and change in school

    performance, and 4) hyperkinesia (primarily restlessness and hyperactivity). Among the gabapentin-treated patients, most of the reactions were mild to moderate in intensity.

    In controlled clinical epilepsy trials in pediatric patients 3–12 years of age, the incidence of these adverse reactions was: emotional lability 6% (gabapentin-treated patients) vs. 1.3% (placebo-treated

    patients); hostility 5.2% vs. 1.3%; hyperkinesia 4.7% vs. 2.9%; and thought disorder 1.7% vs. 0%. One of these reactions, a report of hostility, was considered serious. Discontinuation of gabapentin treatment occurred in 1.3% of patients reporting emotional lability and hyperkinesia and 0.9% of gabapentin-treated patients reporting hostility and thought disorder. One placebo-treated patient (0.4%) withdrew due to emotional lability.

    5.7 Tumorigenic Potential

    In an oral carcinogenicity study, gabapentin increased the incidence of pancreatic acinar cell tumors in rats [see Nonclinical Toxicology (13.1)]. The clinical significance of this finding is unknown. Clinical experience during gabapentin's premarketing development provides no direct means to assess its potential for inducing tumors in humans.

    In clinical studies in adjunctive therapy in epilepsy comprising 2085 patient-years of exposure in patients >12 years of age, new tumors were reported in 10 patients (2 breast, 3 brain, 2 lung, 1 adrenal, 1 non-Hodgkin's lymphoma, 1 endometrial carcinoma in situ), and preexisting tumors worsened in 11 patients (9 brain, 1 breast, 1 prostate) during or up to 2 years following discontinuation of gabapentin. Without knowledge of the background incidence and recurrence in a similar population not treated with gabapentin, it is impossible to know whether the incidence seen in this cohort is or is not affected by treatment.

    5.8 Sudden and Unexplained Death in Patients with Epilepsy

    During the course of premarketing development of gabapentin, 8 sudden and unexplained deaths were recorded among a cohort of 2203 epilepsy patients treated (2103 patient-years of exposure) with gabapentin.

    Some of these could represent seizure-related deaths in which the seizure was not observed, e.g., at night. This represents an incidence of 0.0038 deaths per patient-year. Although this rate exceeds that

    expected in a healthy population matched for age and sex, it is within the range of estimates for the incidence of sudden unexplained deaths in patients with epilepsy not receiving gabapentin (ranging from 0.0005 for the general population of epileptics to 0.003 for a clinical trial population similar to that in the gabapentin program, to 0.005 for patients with refractory epilepsy). Consequently, whether these figures are reassuring or raise further concern depends on comparability of the populations reported upon to the gabapentin cohort and the accuracy of the estimates provided.

    5.9 Laboratory Tests

    Clinical trials data do not indicate that routine monitoring of clinical laboratory parameters is necessary for the safe use of gabapentin. The value of monitoring gabapentin blood concentrations has not been established. Gabapentin may be used in combination with other antiepileptic drugs without concern for alteration of the blood concentrations of gabapentin or of other antiepileptic drugs.

  • 6 ADVERSE REACTIONS

    The following serious adverse reactions are discussed in greater detail in other sections:

    • Drug Reaction with Eosinophilia and Systemic Symptoms (DRESS)/Multiorgan Hypersensitivity [see Warnings and Precautions (5.1)]
    • Somnolence/Sedation and Dizziness [see Warnings and Precautions (5.3)]
    • Withdrawal Precipitated Seizure, Status Epilepticus [see Warnings and Precautions (5.4)]
    • Suicidal Behavior and Ideation [see Warnings and Precautions (5.5)]
    • Neuropsychiatric Adverse Reactions (Pediatric Patients 3–12 Years of Age) [see Warnings and Precautions (5.5)]
    • Sudden and Unexplained Death in Patients with Epilepsy [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.

    Postherpetic Neuralgia

    The most commonly observed adverse reactions associated with the use of gabapentin in adults, not seen at an equivalent frequency among placebo-treated patients, were dizziness, somnolence, and peripheral edema.

    In the 2 controlled studies in postherpetic neuralgia, 16% of the 336 patients who received gabapentin and 9% of the 227 patients who received placebo discontinued treatment because of an adverse reaction. The adverse reactions that most frequently led to withdrawal in gabapentin-treated patients were dizziness, somnolence, and nausea.

    Incidence in Controlled Clinical Trials

    Table 3 lists treatment-emergent signs and symptoms that occurred in at least 1% of gabapentin-treated patients with postherpetic neuralgia participating in placebo-controlled trials and that were numerically more frequent in the gabapentin group than in the placebo group. Adverse reactions were usually mild to moderate in intensity.

    TABLE 3. Treatment-Emergent Adverse Reaction Incidence in Controlled Trials in Postherpetic Neuralgia (Reactions in at least 1% of Gabapentin-Treated Patients and Numerically More Frequent Than in the Placebo Group)

    Body System/ Preferred Term

    Gabapentina

    N=336

    %

    Placebo

    N=227

    %

    Body as a Whole

    Asthenia

    6

    5

    Infection

    5

    4

    Accidental injury

    3

    1

    Digestive System

    Diarrhea

    6

    3

    Dry mouth

    5

    1

    Constipation

    4

    2

    Nausea

    4

    3

    Vomiting

    3

    2

    Metabolic and Nutritional Disorders

    Peripheral edema

    8

    2

    Weight gain

    2

    0

    Hyperglycemia

    1

    0

    Nervous System

    Dizziness

    28

    8

    Somnolence

    21

    5

    Ataxia

    3

    0

    Thinking abnormal

    3

    0

    Abnormal gait

    2

    0

    Incoordination

    2

    0

    Respiratory System

    Pharyngitis

    1

    0

    Special Senses

    Amblyopiaa

    3

    1

    Conjunctivitis

    1

    0

    Diplopia

    1

    0

    Otitis media

    1

    0

    a Reported as blurred vision

    Other reactions in more than 1% of patients but equally or more frequent in the placebo group included pain, tremor, neuralgia, back pain, dyspepsia, dyspnea, and flu syndrome.

    There were no clinically important differences between men and women in the types and incidence of adverse reactions. Because there were few patients whose race was reported as other than white, there are insufficient data to support a statement regarding the distribution of adverse reactions by race.

    Epilepsy

    The most commonly observed adverse reactions associated with the use of gabapentin in combination with other antiepileptic drugs in patients >12 years of age, not seen at an equivalent frequency among placebo-treated patients, were somnolence, dizziness, ataxia, fatigue, and nystagmus. The most commonly observed adverse reactions reported with the use of gabapentin in combination with other antiepileptic drugs in pediatric patients 3 to 12 years of age, not seen at an equal frequency among placebo-treated patients, were viral infection, fever, nausea and/or vomiting, somnolence, and hostility [see Warnings and Precautions (5.4)].

    Approximately 7% of the 2074 patients >12 years of age and approximately 7% of the 449 pediatric patients 3 to 12 years of age who received gabapentin in premarketing clinical trials discontinued treatment because of an adverse reaction. The adverse reactions most commonly associated with withdrawal in patients >12 years of age were somnolence (1.2%), ataxia (0.8%), fatigue (0.6%), nausea and/or vomiting (0.6%), and dizziness (0.6%). The adverse reactions most commonly associated with withdrawal in pediatric patients were emotional lability (1.6%), hostility (1.3%), and hyperkinesia (1.1%).

    Incidence in Controlled Adjunctive Clinical Trials

    Table 4 lists treatment-emergent signs and symptoms that occurred in at least 1% of gabapentin-treated patients >12 years of age with epilepsy participating in placebo-controlled trials and were numerically more common in the gabapentin group. In these studies, either gabapentin or placebo was added to the patient's current antiepileptic drug therapy. Adverse reactions were usually mild to moderate in intensity.

    TABLE 4. Treatment-Emergent Advers e Reaction Incidence in Controlled Add-On Trials In Patients >12 years of age (Reactions in at least 1% of Gabapentin patients and numerically more frequent than in the placebo group)

    Body System/ Adverse Event

    GabapentinaN=543 %

    Placeboa N=378 %

    Body As A Whole

    Fatigue

    11

    5

    Weight Increase

    3

    2

    Back Pain

    2

    1

    Peripheral Edema

    2

    1

    Cardiovascular

    Vasodilatation

    1

    0

    Digestive System

    Dyspepsia

    2

    1

    Mouth or Throat Dry

    2

    1

    Constipation

    2

    1

    Dental Abnormalities

    2

    0

    Nervous System

    Somnolence

    19

    9

    Dizziness

    17

    7

    Ataxia

    13

    6

    Nystagmus

    8

    4

    Tremor

    7

    3

    Dysarthria

    2

    1

    Amnesia

    2

    0

    Depression

    2

    1

    Thinking Abnormal

    2

    1

    Coordination Abnormal

    1

    0

    Respiratory System

    Pharyngitis

    3

    2

    Coughing

    2

    1

    Skin and Appendages

    Abrasion

    1

    0

    Urogenital System

    Impotence

    2

    1

    Special Senses

    Diplopia

    6

    2

    Amblyopiab

    4

    1

    aPlus background antiepileptic drug therapy

    bAmblyopia was often described as blurred vision.

    Among the treatment-emergent adverse reactions occurring at an incidence of at least 10% in gabapentin-treated patients, somnolence and ataxia appeared to exhibit a positive dose-response relationship.

    The overall incidence of adverse reactions and the types of adverse reactions seen were similar among men and women treated with gabapentin. The incidence of adverse reactions increased slightly with increasing age in patients treated with either gabapentin or placebo. Because only 3% of patients (28/921) in placebo-controlled studies were identified as nonwhite (black or other), there are insufficient data to support a statement regarding the distribution of adverse reactions by race.

    Table 5 lists treatment-emergent signs and symptoms that occurred in at least 2% of gabapentin-treated patients, age 3 to 12 years of age with epilepsy participating in placebo-controlled trials, and which were numerically more common in the gabapentin group. Adverse reactions were usually mild to moderate in intensity.

    TABLE 5. Treatment-Emergent Adverse Reaction Incidence in Pediatric Patients Age 3 to 12 Years in a Controlled Add-On Trial (Reactions in at least 2% of Gabapentin patients and numerically more frequent than in the placebo group)

    Body System/ Adverse Reaction

    Gabapentina

    N=119%

    Placeboa

    N=128%

    Body As A Whole

    Viral Infection

    11

    3

    Fever

    10

    3

    Weight Increase

    3

    1

    Fatigue

    3

    2

    Digestive System

    Nausea and/or Vomiting

    8

    7

    Nervous System

    Somnolence

    8

    5

    Hostility

    8

    2

    Emotional Lability

    4

    2

    Dizziness

    3

    2

    Hyperkinesia

    3

    1

    Respiratory System

    Bronchitis

    3

    1

    Respiratory Infection

    3

    1

    a Plus background antiepileptic drug therapy

    Other reactions in more than 2% of pediatric patients 3 to 12 years of age but equally or more frequent in the placebo group included: pharyngitis, upper respiratory infection, headache, rhinitis, convulsions, diarrhea, anorexia, coughing, and otitis media.

    6.2 Postmarketing Experience

    The following adverse reactions have been identified during postmarketing use of gabapentin. Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure.

    General disorders and administration site conditions: fever

    Hepatobiliary disorders: jaundice

    Investigations: blood glucose fluctuation, elevated creatine kinase, elevated liver function tests

    Metabolism and nutrition disorders: hyponatremia

    Nervous system disorders: movement disorder

    Musculoskeletal and connective tissue disorders: rhabdomyolysis

    Reproductive system and breast disorders: breast enlargement

    Skin and subcutaneous tissue disorders: angioedema, erythema multiforme, Stevens-Johnson syndrome.

    Adverse reactions following the abrupt discontinuation of gabapentin have also been reported. The most frequently reported reactions were anxiety, insomnia, nausea, pain, and sweating.

  • 7 DRUG INTERACTIONS

    7.1 Other Antiepileptic Drugs

    Gabapentin is not appreciably metabolized nor does it interfere with the metabolism of commonly coadministered antiepileptic drugs [see Clinical Pharmacology (12.3)].

    7.2 Hydrocodone

    Coadministration of gabapentin (125 to 500 mg) decreases hydrocodone Cmax and AUC values in a dose-dependent manner. The Cmax and AUC values are 3% to 4% lower, respectively, after administration of 125 mg Neurontin and 21% to 22% lower, respectively, after administration of 500 mg gabapentin. Hydrocodone increases gabapentin AUC values by 14% [see Clinical Pharmacology (12.3)].

    7.3 Morphine

    A literature article reported that when a 60 mg controlled-release morphine capsule was administered 2 hours prior to a 600 mg gabapentin capsule (N=12), mean gabapentin AUC increased by 44% compared to gabapentin administered without morphine [see Patient Counseling Information (17)]. Morphine pharmacokinetic parameter values were not affected by administration of gabapentin 2 hours after morphine. The magnitude of interaction at other doses is not known.

    7.4 Maalox® (aluminum hydroxide, magnesium hydroxide)

    The mean bioavailability of gabapentin was reduced by about 20% with concomitant use of antacid (Maalox®) containing magnesium and aluminum hydroxides. It is recommended that gabapentin be taken at least 2 hours following Maalox administration [see Clinical Pharmacology (12.3)].

    7.5 Drug/Laboratory Test Interactions

    Because false positive readings were reported with the Ames N-Multistix SG dipstick test for urinary protein when gabapentin was added to other antiepileptic drugs, the more specific sulfosalicylic acid precipitation procedure is recommended to determine the presence of urine protein.

  • 8 USE IN SPECIFIC POPULATIONS

    8.1 Pregnancy

    Pregnancy Category C: There are no adequate and well-controlled studies in pregnant women. In nonclinical studies in mice, rats, and rabbits, gabapentin was developmentally toxic when administered to pregnant animals at doses similar to or lower than those used clinically. Gabapentin should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus.

    When pregnant mice received oral doses of gabapentin (500, 1000, or 3000 mg/kg/day) during the period of organogenesis, embryo-fetal toxicity (increased incidences of skeletal variations) was observed at the two highest doses. The no-effect dose for embryo-fetal developmental toxicity in mice was 500 mg/kg/day or approximately ½ of the maximum recommended human dose (MRHD) of 3600 mg/kg on a body surface area (mg/m2) basis.

    In studies in which rats received oral doses of gabapentin (500 to 2000 mg/kg/day), during pregnancy, adverse effect on offspring development (increased incidences of hydroureter and/or hydronephrosis) were observed at all doses. The lowest effect dose for developmental toxicity in rats is approximately equal to the MRHD on a mg/m2 basis.

    When pregnant rabbits were treated with gabapentin during the period of organogenesis, an increase in embryo-fetal mortality was observed at all doses tested (60, 300, or 1500 mg/kg). The lowest effect dose for embryo-fetal developmental toxicity in rabbits is less than the MRHD on a mg/m basis.

    In a published study, gabapentin (400 mg/kg/day) was administered by intraperitoneal injection to neonatal mice during the first postnatal week, a period of synaptogenesis in rodents (corresponding to the last trimester of pregnancy in humans). Gabapentin caused a marked decrease in neuronal synapse formation in brains of intact mice and abnormal neuronal synapse formation in a mouse model of synaptic repair. Gabapentin has been shown in vitro to interfere with activity of the α2δ subunit of voltage-activated calcium channels, a receptor involved in neuronal synaptogenesis. The clinical significance of these findings is unknown.

    To provide information regarding the effects of in utero exposure to Gabapentin, physicians are advised to recommend that pregnant patients taking gabapentin enroll in the North American Antiepileptic Drug (NAAED) Pregnancy Registry. This can be done by calling the toll free number 1-888-233-2334, and must be done by patients themselves. Information on the registry can also be found at the website http://www.aedpregnancyregistry.org/.

    8.3 Nursing Mothers

    Gabapentin is secreted into human milk following oral administration. A nursed infant could be exposed to a maximum dose of approximately 1 mg/kg/day of gabapentin. Because the effect on the nursing infant is unknown, Gabapentin should be used in women who are nursing only if the benefits clearly outweigh the risks.

    8.4 Pediatric Use

    Safety and effectiveness of gabapentin in the management of postherpetic neuralgia in pediatric patients have not been established.

    Effectiveness as adjunctive therapy in the treatment of partial seizures in pediatric patients below the age of 3 years has not been established [see Clinical Studies (14.2)].

    8.5 Geriatric Use

    The total number of patients treated with gabapentin in controlled clinical trials in patients with postherpetic neuralgia was 336, of which 102 (30%) were 65 to 74 years of age, and 168 (50%) were 75 years of age and older. There was a larger treatment effect in patients 75 years of age and older compared with younger patients who received the same dosage. Since gabapentin is almost exclusively eliminated by renal excretion, the larger treatment effect observed in patients ≥75 years may be a consequence of increased gabapentin exposure for a given dose that results from an age-related decrease in renal function. However, other factors cannot be excluded. The types and incidence of adverse reactions were similar across age groups except for peripheral edema and ataxia, which tended to increase in incidence with age.

    Clinical studies of gabapentin in epilepsy did not include sufficient numbers of subjects aged 65 and over to determine whether they responded differently from younger subjects. Other reported clinical experience has not identified differences in responses between the elderly and younger patients. 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.

    This drug is known to be substantially excreted by the kidney, and the risk of toxic reactions to this drug may be greater in patients with impaired renal function. Because elderly patients are more likely to have decreased renal function, care should be taken in dose selection, and dose should be adjusted based on creatinine clearance values in these patients [see Dosage and Administration (2.4), Adverse Reactions (6), and Clinical Pharmacology (12.3)].

    8.6 Renal Impairment

    Dosage adjustment in adult patients with compromised renal function is necessary [see Dosage and Administration (2.3) and Clinical Pharmacology (12.3)]. Pediatric patients with renal insufficiency have not been studied.

    Dosage adjustment in patients undergoing hemodialysis is necessary [see Dosage and Administration (2.3) and Clinical Pharmacology (12.3)].

  • 9 DRUG ABUSE AND DEPENDENCE

    9.1 Controlled Substance

    Gabapentin is not a scheduled drug.

    9.2 Abuse

    Gabapentin does not exhibit affinity for benzodiazepine, opiate (mu, delta or kappa), or cannabinoid 1 receptor sites. A small number of postmarketing cases report gabapentin misuse and abuse. These individuals were taking higher than recommended doses of gabapentin for unapproved uses. Most of the individuals described in these reports had a history of poly-substance abuse or used gabapentin to relieve symptoms of withdrawal from other substances. When prescribing gabapentin carefully evaluate patients for a history of drug abuse and observe them for signs and symptoms of gabapentin misuse or abuse (e.g. development of tolerance, self-dose escalation, and drug-seeking behavior).

    9.3 Dependence

    There are rare postmarketing reports of individuals experiencing withdrawal symptoms shortly after discontinuing higher than recommended doses of gabapentin used to treat illnesses for which the drug is not approved. Such symptoms included agitation, disorientation and confusion after suddenly discontinuing gabapentin that resolved after restarting gabapentin. Most of these individuals had a history of poly-substance abuse or used gabapentin to relieve symptoms of withdrawal from other substances. The dependence and abuse potential of gabapentin has not been evaluated in human studies.

  • 10 OVERDOSAGE

    A lethal dose of gabapentin was not identified in mice and rats receiving single oral doses as high as 8000 mg/kg. Signs of acute toxicity in animals included ataxia, labored breathing, ptosis, sedation, hypoactivity, or excitation.

    Acute oral overdoses of gabapentin up to 49 grams have been reported. In these cases, double vision, slurred speech, drowsiness, lethargy and diarrhea, were observed. All patients recovered with supportive care.

    Gabapentin can be removed by hemodialysis. Although hemodialysis has not been performed in the few overdose cases reported, it may be indicated by the patient's clinical state or in patients with significant renal impairment.

    If overexposure occurs, call your poison control center at 1-800-222-1222.

  • 11 DESCRIPTION

    The active ingredient in gabapentin tablets USP is gabapentin USP, which has the chemical name 1-(aminomethyl) cyclohexaneacetic acid.

    The molecular formula of gabapentin USP is C9H17NO2 and the molecular weight is 171.24. The structural formula of gabapentin is:

    Structure

    Gabapentin, USP is a white to off-white crystalline solid with a pKa1 of 3.7 and a pKa2 of 10.7. It is freely soluble in water and both basic and acidic aqueous solutions. The log of the partition coefficient (n-octanol/0.05M phosphate buffer) at pH 7.4 is –1.25.

    Gabapentin tablets, USP are white colored film coated, modified capsule shaped biconvex tablets containing 600 mg and 800 mg of gabapentin, USP.

    The inactive ingredients are mannitol, Hydroxypropyl Cellulose, Crospovidone, Talc, Magnesium stearate and aquarius® BP18114 Cool Vanilla.

  • 12 CLINICAL PHARMACOLOGY

    12.1 Mechanism of Action

    The precise mechanisms by which gabapentin produces its analgesic and antiepileptic actions are unknown.

    In animal models of analgesia, gabapentin prevents allodynia (pain-related behavior in response to a normally innocuous stimulus) and hyperalgesia (exaggerated response to painful stimuli). Gabapentin prevents pain-related responses in several models of neuropathic pain in rats and mice (e.g., spinal nerve ligation models, spinal cord injury model, acute herpes zoster infection model). Gabapentin also decreases pain-related responses after peripheral inflammation (carrageenan footpad test, late phase of formalin test), but does not alter immediate pain-related behaviors (rat tail flick test, formalin footpad acute phase). The relevance of these models to human pain is not known.

    Gabapentin exhibits antiseizure activity in mice and rats in both the maximal electroshock and pentylenetetrazole seizure models and other preclinical models (e.g., strains with genetic epilepsy, etc.). The relevance of these models to human epilepsy is not known.

    Gabapentin is structurally related to the neurotransmitter gamma-aminobutyric acid (GABA) but has no effect on GABA binding, uptake or degradation. Gabapentin did not exhibit affinity for a number of other common receptor ion channel, or transporter proteins. In vitro studies have shown that gabapentin binds with high-affinity to the α2δ subunit of voltage-activated calcium channels; however, the relationship of this binding to the therapeutic effects of gabapentin is unknown.

    12.3 Pharmacokinetics

    All pharmacological actions following gabapentin administration are due to the activity of the parent compound; gabapentin is not appreciably metabolized in humans.

    Oral Bioavailability

    Gabapentin bioavailability is not dose proportional; i.e., as dose is increased, bioavailability decreases. Bioavailability of gabapentin is approximately 60%, 47%, 34%, 33%, and 27% following 900, 1200, 2400, 3600, and 4800 mg/day given in 3 divided doses, respectively. Food has only a slight effect on the rate and extent of absorption of gabapentin (14% increase in AUC and Cmax).

    Distribution

    Less than 3% of gabapentin circulates bound to plasma protein. The apparent volume of distribution of gabapentin after 150 mg intravenous administration is 58±6 L (mean ±SD). In patients with epilepsy,steady-state predose (Cmin ) concentrations of gabapentin in cerebrospinal fluid were approximately 20% of the corresponding plasma concentrations.

    Elimination

    Gabapentin is eliminated from the systemic circulation by renal excretion as unchanged drug. Gabapentin is not appreciably metabolized in humans.

    Gabapentin elimination half-life is 5 to 7 hours and is unaltered by dose or following multiple dosing. Gabapentin elimination rate constant, plasma clearance, and renal clearance are directly proportional to creatinine clearance. In elderly patients, and in patients with impaired renal function, gabapentin plasma clearance is reduced. Gabapentin can be removed from plasma by hemodialysis.

    Special Populations

    Adult Patients With Renal Insufficiency

    Subjects (N=60) with renal insufficiency (mean creatinine clearance ranging from 13–114 mL/min) were administered single 400 mg oral doses of gabapentin. The mean gabapentin half-life ranged from about 6.5 hours (patients with creatinine clearance >60 mL/min) to 52 hours (creatinine clearance <30 mL/min) and gabapentin renal clearance from about 90 mL/min (>60 mL/min group) to about 10 mL/min (<30 mL/min). Mean plasma clearance (CL/F) decreased from approximately 190 mL/min to 20 mL/min.

    Dosage adjustment in adult patients with compromised renal function is necessary [see Dosage and Administration (2.3) and Use in Specific Populations (8.6)]. Pediatric patients with renal insufficiency have not been studied.

    Hemodialysis

    In a study in anuric adult subjects (N=11), the apparent elimination half-life of gabapentin on nondialysis days was about 132 hours; during dialysis the apparent half-life of gabapentin was reduced to 3.8 hours. Hemodialysis thus has a significant effect on gabapentin elimination in anuric subjects.

    Dosage adjustment in patients undergoing hemodialysis is necessary [see Dosage and Administration (2.3) and Use in Specific Populations (8.6)].

    Hepatic Disease

    Because gabapentin is not metabolized, no study was performed in patients with hepatic impairment.

    Age

    The effect of age was studied in subjects 20–80 years of age. Apparent oral clearance (CL/F) of gabapentin decreased as age increased, from about 225 mL/min in those under 30 years of age to about 125 mL/min in those over 70 years of age. Renal clearance (CLr) and CLr adjusted for body surface area also declined with age; however, the decline in the renal clearance of gabapentin with age can largely be explained by the decline in renal function. Reduction of gabapentin dose may be required in patients who have age related compromised renal function. [see Dosage and Administration (2.3) and Use in Specific Populations (8.4)]

    Pediatric

    Gabapentin pharmacokinetics were determined in 48 pediatric subjects between the ages of 1 month and 12 years following a dose of approximately 10 mg/kg. Peak plasma concentrations were similar across the entire age group and occurred 2 to 3 hours postdose. In general, pediatric subjects between 1 month and <5 years of age achieved approximately 30% lower exposure (AUC) than that observed in those 5 years of age and older. Accordingly, oral clearance normalized per body weight was higher in the younger children. Apparent oral clearance of gabapentin was directly proportional to creatinine clearance. Gabapentin elimination half-life averaged 4.7 hours and was similar across the age groups studied.

    A population pharmacokinetic analysis was performed in 253 pediatric subjects between 1 month and 13 years of age. Patients received 10 to 65 mg/kg/day given three times a day. Apparent oral clearance (CL/F) was directly proportional to creatinine clearance and this relationship was similar following a single dose and at steady state. Higher oral clearance values were observed in children <5 years of age compared to those observed in children 5 years of age and older, when normalized per body weight. The clearance was highly variable in infants <1 year of age. The normalized CL/F values observed in pediatric patients 5 years of age and older were consistent with values observed in adults after a single dose. The oral volume of distribution normalized per body weight was constant across the age range.

    These pharmacokinetic data indicate that the effective daily dose in pediatric patients with epilepsy ages 3 and 4 years should be 40 mg/kg/day to achieve average plasma concentrations similar to those achieved in patients 5 years of age and older receiving gabapentin at 30 mg/kg/day [see Dosage and Administration (2.2)].

    Gender

    Although no formal study has been conducted to compare the pharmacokinetics of gabapentin in men and women, it appears that the pharmacokinetic parameters for males and females are similar and there are no significant gender differences.

    Race

    Pharmacokinetic differences due to race have not been studied. Because gabapentin is primarily renally excreted and there are no important racial differences in creatinine clearance, pharmacokinetic differences due to race are not expected.

    Drug Interactions

    In Vitro Studies

    In vitro studies were conducted to investigate the potential of gabapentin to inhibit the major cytochrome P450 enzymes (CYP1A2, CYP2A6, CYP2C9, CYP2C19, CYP2D6, CYP2E1, and CYP3A4) that mediate drug and xenobiotic metabolism using isoform selective marker substrates and human liver microsomal preparations. Only at the highest concentration tested (171 mcg/mL; 1 mM) was a slight degree of inhibition (14%–30%) of isoform CYP2A6 observed. No inhibition of any of the other isoforms tested was observed at gabapentin concentrations up to 171 mcg/mL (approximately 15 times the Cmax at 3600 mg/day).

    In Vivo Studies

    The drug interaction data described in this section were obtained from studies involving healthy adults and adult patients with epilepsy.

    Phenytoin

    In a single (400 mg) and multiple dose (400 mg three times a day) study of gabapentin in epileptic patients (N=8) maintained on phenytoin monotherapy for at least 2 months, gabapentin had no effect on the steady-state trough plasma concentrations of phenytoin and phenytoin had no effect on gabapentin pharmacokinetics.

    Carbamazepine

    Steady-state trough plasma carbamazepine and carbamazepine 10, 11 epoxide concentrations were not affected by concomitant gabapentin (400 mg three times a day; N=12) administration. Likewise, gabapentin pharmacokinetics were unaltered by carbamazepine administration.

    Valproic Acid

    The mean steady-state trough serum valproic acid concentrations prior to and during concomitant gabapentin administration (400 mg three times a day; N=17) were not different and neither were gabapentin pharmacokinetic parameters affected by valproic acid.

    Phenobarbital

    Estimates of steady-state pharmacokinetic parameters for phenobarbital or gabapentin (300 mg three times a day; N=12) are identical whether the drugs are administered alone or together.

    Naproxen

    Coadministration (N=18) of naproxen sodium capsules (250 mg) with NEURONTIN (125 mg) appears to increase the amount of gabapentin absorbed by 12% to 15%. Gabapentin had no effect on naproxen pharmacokinetic parameters. These doses are lower than the therapeutic doses for both drugs. The magnitude of interaction within the recommended dose ranges of either drug is not known.

    Hydrocodone

    Coadministration of gabapentin (125 to 500 mg; N=48) decreases hydrocodone (10 mg; N=50) C and AUC values in a dose-dependent manner relative to administration of hydrocodone alone; Cmax and AUC values are 3% to 4% lower, respectively, after administration of 125 mg gabapentin and 21% to 22% lower, respectively, after administration of 500 mg gabapentin. The mechanism for this interaction is unknown. Hydrocodone increases gabapentin AUC values by 14%. The magnitude of interaction at other doses is not known.

    Morphine

    A literature article reported that when a 60 mg controlled-release morphine capsule was administered 2 hours prior to a 600 mg gabapentin capsule (N=12), mean gabapentin AUC increased by 44% compared to gabapentin administered without morphine. Morphine pharmacokinetic parameter values were not affected by administration of gabapentin 2 hours after morphine. The magnitude of interaction at other doses is not known.

    Cimetidine

    In the presence of cimetidine at 300 mg QID (N=12), the mean apparent oral clearance of gabapentin fell by 14% and creatinine clearance fell by 10%. Thus, cimetidine appeared to alter the renal excretion of both gabapentin and creatinine, an endogenous marker of renal function. This small decrease in excretion of gabapentin by cimetidine is not expected to be of clinical importance. The effect of gabapentin on cimetidine was not evaluated.

    Oral Contraceptive

    Based on AUC and half-life, multiple-dose pharmacokinetic profiles of norethindrone and ethinyl estradiol following administration of tablets containing 2.5 mg of norethindrone acetate and 50 mcg of ethinyl estradiol were similar with and without coadministration of gabapentin (400 mg three times a day; N=13). The Cmax of norethindrone was 13% higher when it was coadministered with gabapentin; this interaction is not expected to be of clinical importance.

    Antacid (Maalox®) (aluminum hydroxide, magnesium hydroxide)

    Antacid (Maalox®) containing magnesium and aluminum hydroxides reduced the mean bioavailability of gabapentin (N=16) by about 20%. This decrease in bioavailability was about 10% when gabapentin was administered 2 hours after Maalox. It is recommended that gabapentin be taken at least 2 hours following Maalox administration.

    Probenecid

    Probenecid is a blocker of renal tubular secretion. Gabapentin pharmacokinetic parameters without and with probenecid were comparable. This indicates that gabapentin does not undergo renal tubular secretion by the pathway that is blocked by probenecid.

  • 13 NONCLINICAL TOXICOLOGY

    13.1 Carcinogenesis, Mutagenesis, Impairment of Fertility

    Gabapentin was administered orally to mice and rats in 2-year carcinogenicity studies. No evidence of drug-related carcinogenicity was observed in mice treated at doses up to 2000 mg/kg/day. At 2000 mg/kg, the plasma gabapentin exposure (AUC) in mice is approximately 2 times that in humans at the MRHD of 3600 mg/day. In rats, increases in the incidence of pancreatic acinar cell adenoma and carcinoma were found in male rats receiving the highest dose (2000 mg/kg), but not at doses of 250 or 1000 mg/kg/day. At 1000 mg/kg, the plasma gabapentin exposure (AUC) in rats is approximately 5 times that in humans at the MRHD.

    Studies designed to investigate the mechanism of gabapentin-induced pancreatic carcinogenesis in rats indicate that gabapentin stimulates DNA synthesis in rat pancreatic acinar cells in vitro and, thus, may be acting as a tumor promoter by enhancing mitogenic activity. It is not known whether gabapentin has the ability to increase cell proliferation in other cell types or in other species, including humans.

    Gabapentin did not demonstrate mutagenic or genotoxic potential in three in vitro and four in vivo assays. It was negative in the Ames test and the in vitro HGPRT forward mutation assay in Chinese hamster lung cells; it did not produce significant increases in chromosomal aberrations in the in vitro Chinese hamster lung cell assay; it was negative in the in vivo chromosomal aberration assay and in the in vivo micronucleus test in Chinese hamster bone marrow; it was negative in the in vivo mouse micronucleus assay; and it did not induce unscheduled DNA synthesis in hepatocytes from rats given gabapentin.

    No adverse effects on fertility or reproduction were observed in rats at doses up to 2000 mg/kg. At 2000 mg/kg, the plasma gabapentin exposure (AUC) in rats is approximately 8 times that in humans at the MRHD.

  • 14 CLINICAL STUDIES

    14.1 Postherpetic Neuralgia

    Gabapentin was evaluated for the management of postherpetic neuralgia (PHN) in two randomized, double-blind, placebo-controlled, multicenter studies. The intent-to-treat (ITT) population consisted of a total of 563 patients with pain for more than 3 months after healing of the herpes zoster skin rash (Table 6).

    TABLE 6. Controlled PHN Studies: Duration, Dosages, and Number of Patients

    Study

    Study Duration

    Gabapentin (mg/day)a

    Target Dose

    Patients Receiving Gabapentin

    Patients Receiving Placebo

    1

    8 weeks

    3600

    113

    116

    2

    7 weeks

    1800, 2400

    223

    111

    Total

    336

    227

    aGiven in 3 divided doses (TID)

    Each study included a 7- or 8-week double-blind phase (3 or 4 weeks of titration and 4 weeks of fixed dose). Patients initiated treatment with titration to a maximum of 900 mg/day gabapentin over 3 days. Dosages were then to be titrated in 600 to 1200 mg/day increments at 3- to 7-day intervals to the target dose over 3 to 4 weeks. Patients. recorded their pain in a daily diary using an 11-point numeric pain rating scale ranging from 0 (no pain) to 10 (worst possible pain). A mean pain score during baseline of at least 4 was required for randomization. Analyses were conducted using the ITT population (all randomized patients who received at least one dose of study medication).

    Both studies demonstrated efficacy compared to placebo at all doses tested.

    The reduction in weekly mean pain scores was seen by Week 1 in both studies, and was maintained to the end of treatment. Comparable treatment effects were observed in all active treatment arms. Pharmacokinetic/pharmacodynamic modeling provided confirmatory evidence of efficacy across all doses. Figures 1 and 2 show pain intensity scores over time for Studies 1 and 2.

    Figure 1. Weekly Mean Pain Scores (Observed Cases in ITT Population): Study 1

    Figure 2. Weekly Mean Pain Scores (Observed Cases in ITT Population): Study 2

    The proportion of responders (those patients reporting at least 50% improvement in endpoint pain score compared with baseline) was calculated for each study (Figure 3).

    Figure 3. Proportion of Responders (patients with ≥50% reduction in pain score) at Endpoint: Controlled PHN Studies

    14.2 Epilepsy

    The effectiveness of gabapentin as adjunctive therapy (added to other antiepileptic drugs) was established in multicenter placebo-controlled, double-blind, parallel-group clinical trials in adult and pediatric patients (3 years and older) with refractory partial seizures.

    Evidence of effectiveness was obtained in three trials conducted in 705 patients (age 12 years and above) and one trial conducted in 247 pediatric patients (3 to 12 years of age). The patients enrolled had a history of at least 4 partial seizures per month in spite of receiving one or more antiepileptic drugs at therapeutic levels and were observed on their established antiepileptic drug regimen during a 12-week baseline period (6 weeks in the study of pediatric patients). In patients continuing to have at least 2 (or 4 in some studies) seizures per month, gabapentin or placebo was then added on to the existing therapy during a 12-week treatment period. Effectiveness was assessed primarily on the basis of the percent of patients with a 50% or greater reduction in seizure frequency from baseline to treatment (the "responder rate") and a derived measure called response ratio, a measure of change defined as (T - B) / (T + B), in which B is the patient's baseline seizure frequency and T is the patient's seizure frequency during treatment. Response ratio is distributed within the range -1 to +1. A zero value indicates no change while complete elimination of seizures would give a value of -1; increased seizure rates would give positive values. A response ratio of -0.33 corresponds to a 50% reduction in seizure frequency. The results given below are for all partial seizures in the intent-to-treat (all patients who received any doses of treatment) population in each study, unless otherwise indicated.

    One study compared gabapentin 1200 mg/day, in three divided doses with placebo. Responder rate was 23% (14/61) in the gabapentin group and 9% (6/66) in the placebo group; the difference between groups was statistically significant. Response ratio was also better in the gabapentin group (-0.199) than in the placebo group (-0.044), a difference that also achieved statistical significance.

    A second study compared primarily gabapentin 1200 mg/day, in three divided doses (N=101), with placebo (N=98). Additional smaller gabapentin dosage groups (600 mg/day, N=53; 1800 mg/day, N=54) were also studied for information regarding dose response. Responder rate was higher in the gabapentin 1200 mg/day group (16%) than in the placebo group (8%), but the difference was not statistically significant. The responder rate at 600 mg (17%) was also not significantly higher than in the placebo, but the responder rate in the 1800 mg group (26%) was statistically significantly superior to the placebo rate. Response ratio was better in the gabapentin 1200 mg/day group (-0.103) than in the placebo group (-0.022); but this difference was also not statistically significant (p = 0.224). A better response was seen in the gabapentin 600 mg/day group (-0.105) and 1800 mg/day group (-0.222) than in the 1200 mg/day group, with the 1800 mg/day group achieving statistical significance compared to the placebo group.

    A third study compared gabapentin 900 mg/day, in three divided doses (N=111), and placebo (N=109). An additional gabapentin 1200 mg/day dosage group (N=52) provided dose-response data. A statistically significant difference in responder rate was seen in the gabapentin 900 mg/day group (22%) compared to that in the placebo group (10%). Response ratio was also statistically significantly superior in the gabapentin 900 mg/day group (-0.119) compared to that in the placebo group (-0.027), as was response ratio in 1200 mg/day gabapentin (-0.184) compared to placebo.

    Analyses were also performed in each study to examine the effect of gabapentin on preventing secondarily generalized tonic-clonic seizures. Patients who experienced a secondarily generalized tonic-clonic seizure in either the baseline or in the treatment period in all three placebo-controlled studies were included in these analyses. There were several response ratio comparisons that showed a statistically significant advantage for gabapentin compared to placebo and favorable trends for almost all comparisons.

    Analysis of responder rate using combined data from all three studies and all doses (N=162, gabapentin; N=89, placebo) also showed a significant advantage for gabapentin over placebo in reducing the frequency of secondarily generalized tonic-clonic seizures.

    In two of the three controlled studies, more than one dose of gabapentin was used. Within each study, the results did not show a consistently increased response to dose. However, looking across studies, a trend toward increasing efficacy with increasing dose is evident (see Figure 4).

    Figure 4. Responder Rate in Patients Receiving Gabapentin Expressed as a Difference from Placebo by Dose and Study: Adjunctive Therapy Studies in Patients ≥12 Years of Age with Partial Seizures

    In the figure, treatment effect magnitude, measured on the Y axis in terms of the difference in the proportion of gabapentin and placebo-assigned patients attaining a 50% or greater reduction in seizure frequency from baseline, is plotted against the daily dose of gabapentin administered (X axis).

    Although no formal analysis by gender has been performed, estimates of response (Response Ratio) derived from clinical trials (398 men, 307 women) indicate no important gender differences exist. There was no consistent pattern indicating that age had any effect on the response to gabapentin. There were insufficient numbers of patients of races other than Caucasian to permit a comparison of efficacy among racial groups.

    A fourth study in pediatric patients age 3 to 12 years compared 25 – 35 mg/kg/day gabapentin (N=118) with placebo (N=127). For all partial seizures in the intent-to-treat population, the response ratio was statistically significantly better for the gabapentin group (-0.146) than for the placebo group (-0.079). For the same population, the responder rate for gabapentin (21%) was not significantly different from placebo (18%).

    A study in pediatric patients age 1 month to 3 years compared 40 mg/kg/day gabapentin (N=38) with placebo (N=38) in patients who were receiving at least one marketed antiepileptic drug and had at least one partial seizure during the screening period (within 2 weeks prior to baseline). Patients had up to 48 hours of baseline and up to 72 hours of double-blind video EEG monitoring to record and count the occurrence of seizures. There were no statistically significant differences between treatments in either the response ratio or responder rate.

  • 16 HOW SUPPLIED/STORAGE AND HANDLING

    Gabapentin Tablets, USP are supplied as follows:

    Gabapentin Tablets, USP 800 mg: White colored film coated, Modified Capsule shaped, biconvex tablets de-bossed with '1' on the left side of the bisect and '3' on the right side of the bisect on one side and bisect on other.

    Bottles of 30's count: (NDC: 63187-231-30)

    Bottles of 60’s count: (NDC: 63187-231-60)

    Bottles of 90's count: (NDC: 63187-231-90)

    Bottles of 100's count: (NDC: 63187-231-00)

    Bottles of 120's count: (NDC: 63187-231-72)

    Bottles of 180's count: (NDC: 63187-231-78)

    Store at 20°C to 25°C (68° to 77°F). [see USP Controlled Room Temperature].

    Manufactured by:

    InvaGen Pharmceuticals, Inc. for Camber Pharmaceuicals

    Repackaged by:

    Proficient Rx LP

    Thousand Oaks, CA 91320

  • Medication Guide

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

    What is the most important information I should know about gabapentin tablets? 
    Do not stop taking gabapentin tablets without first talking to your healthcare provider.

    Stopping gabapentin tablets suddenly can cause serious problems.

    Gabapentin tablets can cause serious side effects including:

    1.          Suicidal Thoughts. Like other antiepileptic drugs, gabapentin tablets may cause suicidal thoughts or actions in a very small number of people, about 1 in 500.

    Call a healthcare provider right away if you have any of these symptoms, especially if they are new, worse, or worry you:

    • thoughts about suicide or dying
    • attempts to commit suicide
    • new or worse depression
    • new or worse anxiety
    • feeling agitated or restless
    • panic attacks
    • trouble sleeping (insomnia)
    • new or worse irritability
    • acting aggressive, being angry, or violent
    • acting on dangerous impulses
    • an extreme increase in activity and talking (mania)
    • other unusual changes in behavior or mood

    How can I watch for early symptoms of suicidal thoughts and actions?

    • Pay attention to any changes, especially sudden changes, in mood, behaviors, thoughts, or feelings.
    • Keep all follow-up visits with your healthcare provider as scheduled.

    Call your healthcare provider between visits as needed, especially if you are worried about symptoms.

    Do not stop taking gabapentin tablets without first talking to a healthcare provider.

    • Stopping gabapentin tablets suddenly can cause serious problems. Stopping a seizure medicine suddenly in a patient who has epilepsy can cause seizures that will not stop (status epilepticus).
    • Suicidal thoughts or actions can be caused by things other than medicines. If you have suicidal thoughts or actions, your healthcare provider may check for other causes. 
      2.       Changes in behavior and thinking - Using gabapentin tablets in children 3 to 12 years of age can cause emotional changes, aggressive behavior, problems with concentration, restlessness, changes in school performance, and hyperactivity.

    3.       Gabapentin tablets may cause serious or life-threatening allergic reactionsthat may affect your skin or other parts of your body such as your liver or blood cells. This may cause you to be hospitalized or to stop gabapentin tablets. You may or may not have a rash with an allergic reaction caused by gabapentin tablets. Call a healthcare provider right away if you have any of the following symptoms:

    • skin rash
    • hives
    • difficulty breathing
    • fever
    • swollen glands that do not go away
    • swelling of your face, lips, throat, or tongue
    • yellowing of your skin or of the whites of the eyes
    • unusual bruising or bleeding
    • severe fatigue or weakness
    • unexpected muscle pain
    • frequent infections

    These symptoms may be the first signs of a serious reaction. A healthcare provider should examine you to decide if you should continue taking gabapentin tablets.

    What are gabapentin tablets?

    Gabapentin tablets are a prescription medicine used to treat:

    • Pain from damaged nerves (postherpetic pain) that follows healing of shingles (a painful rash that comes after a herpes zoster infection) in adults.
    • Partial seizures when taken together with other medicines in adults and children 3 years of age and older with seizures.

    Who should not take gabapentin tablets?

    Do not take gabapentin tablets if you are allergic to gabapentin or any of the other ingredients in gabapentin tablets. See the end of this Medication Guide for a complete list of ingredients in gabapentin tablets.

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

    Before taking gabapentin tablets, tell your healthcare provider if you:

    • have or have had kidney problems or are on hemodialysis
    • have or have had depression, mood problems, or suicidal thoughts or behavior
    • have diabetes
    • are pregnant or plan to become pregnant. It is not known if gabapentin tablets can harm your unborn baby. Tell your healthcare provider right away if you become pregnant while taking gabapentin tablets. You and your healthcare provider will decide if you should take gabapentin tablets while you are pregnant.
    • If you become pregnant while taking gabapentin tablets, talk to your healthcare provider about registering with the North American Antiepileptic Drug (NAAED) Pregnancy Registry. The purpose of this registry is to collect information about the safety of antiepileptic drugs during pregnancy. You can enroll in this registry by calling 1-888-233-2334.
    • are breast-feeding or plan to breast-feed. Gabapentin can pass into breast milk. You and your healthcare provider should decide how you will feed your baby while you take gabapentin.

    Tell your healthcare provider about all the medicines you take, including prescription and over-the-counter medicines, vitamins, and herbal supplements.

    Taking gabapentin tablets with certain other medicines can cause side effects or affect how well they work. Do not start or stop other medicines without talking to your healthcare provider.

    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 gabapentin tablets?

    • Take gabapentin tablets exactly as prescribed. Your healthcare provider will tell you how much gabapentin tablets to take.
    • Do not change your dose of gabapentin tablets without talking to your healthcare provider.
    • If you take gabapentin tablets and break a tablet in half, the unused half of the tablet should be taken at your next scheduled dose. Half tablets not used within 28 days of breaking should be thrown away
    • Gabapentin tablets can be taken with or without food. If you take an antacid containing aluminum and magnesium, such as Maalox®, Mylanta®, Gelusil®, Gaviscon®, or Di-Gel®, you should wait at least 2 hours before taking your next dose of gabapentin tablets.

    If you take too much gabapentin tablets, call your healthcare provider or your local Poison Control Center right away at 1-800-222-1222.

    What should I avoid while taking gabapentin tablets?

    • Do not drink alcohol or take other medicines that make you sleepy or dizzy while taking gabapentin tablets without first talking with your healthcare provider. Taking gabapentin tablets with alcohol or drugs that cause sleepiness or dizziness may make your sleepiness or dizziness worse.
    • Do not drive, operate heavy machinery, or do other dangerous activities until you know how gabapentin tablets affects you. Gabapentin tablets can slow your thinking and motor skills.

    What are the possible side effects of gabapentin tablets?

    Gabapentin may cause serious side effects including:

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

    • problems driving while using gabapentin tablets. See “What I should avoid while taking gabapentin tablets?”
    • sleepiness and dizziness, which could increase the occurrence of accidental injury, including falls
    • The most common side effects of gabapentin tablets include:
      • o lack of coordination
      • o viral infection
      • o feeling drowsy
      • o nausea and vomiting
      • o difficulty with speaking
      • o tremor
      • o swelling, usually of legs and feet
      • o feeling tired
      • o fever
    • jerky movements
    • difficulty with coordination
      • o double vision
      • o unusual eye movement

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

    These are not all the possible side effects of gabapentin 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 gabapentin tablets?

    Store gabapentin tablets at 20° to 25°C (68° to 77°F). [see USP controlled room temperature].

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

    General information about the safe and effective use of gabapentin tablets

    Medicines are sometimes prescribed for purposes other than those listed in a Medication Guide. Do not use gabapentin tablets for a condition for which it was not prescribed. Do not give gabapentin tablets to other people, even if they have the same symptoms that you have. It may harm them.

    This Medication Guide summarizes the most important information about gabapentin tablets. If you would like more information, talk with your healthcare provider. You can ask your healthcare provider or pharmacist for information about gabapentin tablets that was written for healthcare professionals.

    For more information about gabapentin tablets, or to report side effects regarding gabapentin tablets, please call Camber Pharmaceuticals, Inc. at 1-866-495-8330.

    What are the ingredients in gabapentin tablets, USP?

    Active ingredient: Gabapentin, USP

    Inactive ingredients: Mannitol, Hydroxypropyl Cellulose, Crospovidone, Talc, Magnesium Stearate and Aquarius® BP18114 Cool Vanilla.

    This Medication Guide has been approved by the U.S. Food and Drug Administration.

    All brand names listed are the registered trademarks of their respective owners and are not trademarks of Camber Pharmaceuticals, Inc.

  • PACKAGE/LABEL PRINCIPAL DISPLAY PANEL

    Gabapentin Tablets, USP
    800 mg

    63187-231-90
  • INGREDIENTS AND APPEARANCE
    GABAPENTIN 
    gabapentin tablet
    Product Information
    Product TypeHUMAN PRESCRIPTION DRUGItem Code (Source)NDC: 63187-231(NDC:31722-406)
    Route of AdministrationORAL
    Active Ingredient/Active Moiety
    Ingredient NameBasis of StrengthStrength
    GABAPENTIN (UNII: 6CW7F3G59X) (GABAPENTIN - UNII:6CW7F3G59X) GABAPENTIN800 mg
    Inactive Ingredients
    Ingredient NameStrength
    MANNITOL (UNII: 3OWL53L36A)  
    HYDROXYPROPYL CELLULOSE (1600000 WAMW) (UNII: RFW2ET671P)  
    CROSPOVIDONE (15 MPA.S AT 5%) (UNII: 68401960MK)  
    TALC (UNII: 7SEV7J4R1U)  
    MAGNESIUM STEARATE (UNII: 70097M6I30)  
    HYPROMELLOSE, UNSPECIFIED (UNII: 3NXW29V3WO)  
    TITANIUM DIOXIDE (UNII: 15FIX9V2JP)  
    POLYETHYLENE GLYCOL, UNSPECIFIED (UNII: 3WJQ0SDW1A)  
    POLYSORBATE 80 (UNII: 6OZP39ZG8H)  
    Product Characteristics
    ColorWHITEScore2 pieces
    ShapeCAPSULE (modified-capsule shape, biconvex) Size9mm
    FlavorImprint Code 1;3
    Contains    
    Packaging
    #Item CodePackage DescriptionMarketing Start DateMarketing End Date
    1NDC: 63187-231-3030 in 1 BOTTLE; Type 0: Not a Combination Product12/01/2018
    2NDC: 63187-231-6060 in 1 BOTTLE; Type 0: Not a Combination Product12/01/2018
    3NDC: 63187-231-9090 in 1 BOTTLE; Type 0: Not a Combination Product12/01/2018
    4NDC: 63187-231-00100 in 1 BOTTLE; Type 0: Not a Combination Product12/01/2018
    5NDC: 63187-231-72120 in 1 BOTTLE; Type 0: Not a Combination Product12/01/2018
    6NDC: 63187-231-78180 in 1 BOTTLE; Type 0: Not a Combination Product12/01/2018
    Marketing Information
    Marketing CategoryApplication Number or Monograph CitationMarketing Start DateMarketing End Date
    ANDAANDA20276410/29/2012
    Labeler - Proficient Rx LP (079196022)
    Establishment
    NameAddressID/FEIBusiness Operations
    Proficient Rx LP079502574REPACK(63187-231) , RELABEL(63187-231)
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