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Uses
Topiramate is indicated for:
- Monotherapy epilepsy: Initial monotherapy in patients ≥ 2 years of age with partial onset or primary generalized tonic-clonic seizures (1.1)
- Adjunctive therapy epilepsy: Adjunctive therapy for adults and pediatric patients (2 to 16 years of age) with partial onset seizures or primary generalized tonic-clonic seizures, and in patients ≥ 2 years of age with seizures associated with Lennox-Gastaut syndrome (LGS) (1.2)
Topiramate tablets, USP and topiramate capsules (sprinkle) are indicated as initial monotherapy in patients 2 years of age and older with partial onset or primary generalized tonic-clonic seizures. Safety and effectiveness in patients who were converted to monotherapy from a previous regimen of other anticonvulsant drugs have not been established in controlled trials [see CLINICAL STUDIES (14.1)].
Topiramate tablets, USP and topiramate capsules (sprinkle) are indicated as adjunctive therapy for adults and pediatric patients ages 2 to 16 years with partial onset seizures or primary generalized tonic-clonic seizures, and in patients 2 years of age and older with seizures associated with Lennox-Gastaut syndrome [see CLINICAL STUDIES (14.2)].
History
There is currently no drug history available for this drug.
Other Information
Topiramate is a sulfamate-substituted monosaccharide. Topiramate tablets, USP are available as 25 mg, 50 mg, 100 mg, and 200 mg round tablets for oral administration. Topiramate capsules (sprinkle) are available as 15 mg and 25 mg sprinkle capsules for oral administration as whole capsules or opened and sprinkled onto soft food.
Topiramate, USP is a white to off-white crystalline powder with bitter taste. It is freely soluble in dichloromethane. Topiramate has the molecular formula C12H21NO8S and a molecular weight of 339.36. Topiramate is designated chemically as 2,3:4,5-Di-O-isopropylidene-β-D-fructopyranose sulfamate and has the following structural formula:
Each topiramate tablet intended for oral administration contains 25 mg or 50 mg or 100 mg or 200 mg of topiramate. In addition, each tablet contains the following inactive ingredients: colloidal silicon dioxide, hypromellose, lactose anhydrous, magnesium stearate, microcrystalline cellulose, polyethylene glycol, sodium starch glycolate, talc and titanium dioxide.
Each topiramate capsule (sprinkle) intended for oral administration contains 15 mg or 25 mg of topiramate. In addition, each capsule contains the following inactive ingredients: cellulose acetate, gelatin, hypromellose, povidone, sodium lauryl sulfate, sugar spheres, talc and titanium dioxide. Each capsule is printed with black pharmaceutical ink.
Sources
Post Treatment Balm Manufacturers
-
Allure Labs, Inc
Post Treatment Balm | Remedyrepack Inc.
See DOSAGE AND ADMINISTRATION, Epilepsy: Monotherapy and Adjunctive Therapy Use for additional details (2.1)
Initial Dose
Titration
Recommended Dose
Epilepsy
monotherapy:
children 2 to < 10
years (2.1)
25 mg/day
administered
nightly for the
first week
The dosage should be titrated over 5 to 7 weeks
Daily doses in
two divided doses based on weight (Table 2)
Epilepsy
monotherapy:
adults and
pediatric patients
≥ 10 years (2.1)
50 mg/day
in two
divided
doses
The dosage should be increased weekly by increments of 50 mg for the first 4 weeks then 100 mg for weeks 5 to 6.
400 mg/day in
two divided
doses
Epilepsy
adjunctive
therapy: adults
with partial onset
seizures or LGS
(2.1)
25 to 50
mg/day
The dosage should be increased weekly to an effective dose by increments of 25 to 50 mg.
200 to 400
mg/day in two
divided doses
Epilepsy
adjunctive
therapy: adults
with primary
generalized
tonic-clonic
seizures (2.1)
25 to 50
mg/day
The dosage should be increased weekly to an effective dose by increments of 25 to 50 mg.
400 mg/day in
two divided
doses
Epilepsy adjunctive
therapy: pediatric
patients with
partial onset
seizures, primary
generalized tonic-clonic seizures or LGS (2.1)
25 mg/day (or less,
based on a range of 1 to 3 mg/kg/day)
nightly for the first
week.
The dosage should be increased at 1 or 2 week intervals by increments of 1 to 3 mg/kg/day (administered in two
divided doses). Dose titration should be guided
by clinical outcome.
5 to 9
mg/kg/day in
two divided
doses
It is not necessary to monitor topiramate plasma concentrations to optimize topiramate therapy.
On occasion, the addition of topiramate to phenytoin may require an adjustment of the dose of phenytoin to achieve optimal clinical outcome. Addition or withdrawal of phenytoin and/or carbamazepine during adjunctive therapy with topiramate may require adjustment of the dose of topiramate .
Because of the bitter taste, tablets should not be broken.
Topiramate can be taken without regard to meals.
Monotherapy Use
Adults and Pediatric Patients 10 Years and Older
The recommended dose for topiramate monotherapy in adults and pediatric patients 10 years of age and older is 400 mg/day in two divided doses. Approximately 58 % of patients randomized to 400 mg/day achieved this maximal dose in the monotherapy controlled trial; the mean dose achieved in the trial was 275 mg/day. The dose should be achieved by titration according to the following schedule (Table 1):
Morning Dose
Evening Dose
Week 1
25 mg
25 mg
Week 2
50 mg
50 mg
Week 3
75 mg
75 mg
Week 4
100 mg
100 mg
Week 5
150 mg
150 mg
Week 6
200 mg
200 mg
Children Ages 2 to < 10 Years
Dosing of topiramate as initial monotherapy in children 2 to < 10 years of age with partial onset or primary generalized tonic-clonic seizures was based on a pharmacometric bridging approach [see Clinical Studies (14.1)].
Dosing in patients 2 to < 10 years is based on weight. During the titration period, the initial dose of topiramate should be 25 mg/day administered nightly for the first week. Based upon tolerability, the dosage can be increased to 50 mg/day (25 mg twice daily) in the second week. Dosage can be increased by 25 to 50 mg/day each subsequent week as tolerated. Titration to the minimum maintenance dose should be attempted over 5 to 7 weeks of the total titration period. Based upon tolerability and clinical response, additional titration to a higher dose (up to the maximum maintenance dose) can be attempted at 25 to 50 mg/day weekly increments. The total daily dose should not exceed the maximum maintenance dose for each range of body weight (Table 2)
Table 2Monotherapy Target Total Daily Maintenance Dosing for Patients 2 to < 10 Years
Weight (kg)
Total Daily Dose (mg/day)*
Minimum Maintenance Dose
Total Daily Dose (mg/day)*
Maximum Maintenance Dose
Up to 11
150
250
12 to 22
200
300
23 to 31
200
350
32 to 38
250
350
Greater than 38
250
400
* Administered in two equally divided doses
Adults 17 Years of Age and Over - Partial Onset Seizures, Primary Generalized Tonic-Clonic Seizures, or Lennox-Gastaut Syndrome
The recommended total daily dose of topiramate as adjunctive therapy in adults with partial onset seizures is 200 to 400 mg/day in two divided doses, and 400 mg/day in two divided doses as adjunctive treatment in adults with primary generalized tonic-clonic seizures. It is recommended that therapy be initiated at 25 to 50 mg/day followed by titration to an effective dose in increments of 25 to 50 mg/day every week. Titrating in increments of 25 mg/day every week may delay the time to reach an effective dose. Doses above 400 mg/day (600, 800 or 1,000 mg/day) have not been shown to improve responses in dose-response studies in adults with partial onset seizures. Daily doses above 1,600 mg have not been studied.
In the study of primary generalized tonic-clonic seizures the initial titration rate was slower than in previous studies; the assigned dose was reached at the end of 8 weeks [see CLINICAL STUDIES (14.1)].
Pediatric Patients Ages 2 to 16 Years – Partial Onset Seizures, Primary Generalized Tonic-Clonic Seizures, or Lennox-Gastaut Syndrome
The recommended total daily dose of topiramate as adjunctive therapy for pediatric patients with partial onset seizures, primary generalized tonic-clonic seizures, or seizures associated with Lennox-Gastaut syndrome is approximately 5 to 9 mg/kg/day in two divided doses. Titration should begin at 25 mg/day (or less, based on a range of 1 to 3 mg/kg/day) nightly for the first week. The dosage should then be increased at 1- or 2-week intervals by increments of 1 to 3 mg/kg/day (administered in two divided doses), to achieve optimal clinical response. Dose titration should be guided by clinical outcome.
In the study of primary generalized tonic-clonic seizures, the initial titration rate was slower than in previous studies; the assigned dose of 6 mg/kg/day was reached at the end of 8 weeks [see CLINICAL STUDIES (14.1)].
Topiramate capsules (sprinkle) may be swallowed whole or may be administered by carefully opening the capsule and sprinkling the entire contents on a small amount (teaspoon) of soft food. This drug/food mixture should be swallowed immediately and not chewed. It should not be stored for future use.
In renally impaired subjects (creatinine clearance less than 70 mL/min/1.73 m2), one-half of the usual adult dose is recommended. Such patients will require a longer time to reach steady-state at each dose.
Dosage adjustment may be indicated in the elderly patient when impaired renal function (creatinine clearance rate < 70 mL/min/1.73 m2) is evident [see CLINICAL PHARMACOLOGY (12.3)].
Topiramate is cleared by hemodialysis at a rate that is 4 to 6 times greater than a normal individual. Accordingly, a prolonged period of dialysis may cause topiramate concentration to fall below that required to maintain an anti-seizure effect. To avoid rapid drops in topiramate plasma concentration during hemodialysis, a supplemental dose of topiramate may be required. The actual adjustment should take into account 1) the duration of dialysis period, 2) the clearance rate of the dialysis system being used, and 3) the effective renal clearance of topiramate in the patient being dialyzed.
In hepatically impaired patients, topiramate plasma concentrations may be increased. The mechanism is not well understood.
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