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Topamax Dosage

Generic name: topiramate 25mg
Dosage form: tablet, coated; capsule, coated pellets

The information at Drugs.com is not a substitute for medical advice. Always consult your doctor or pharmacist.

Dosing in Monotherapy Epilepsy

Adults and Pediatric Patients 10 Years of Age and Older

The recommended dose for TOPAMAX® monotherapy in adults and pediatric patients 10 years of age and older is 400 mg/day in two divided doses. The dose should be achieved by titration according to the following schedule (Table 1):

Table 1: Monotherapy Titration Schedule for Adults and Pediatric Patients 10 years and older
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

Pediatric Patients 2 to 9 Years of Age

Dosing in patients 2 to 9 years of age is based on weight. During the titration period, the initial dose of TOPAMAX® is 25 mg/day 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 25–50 mg/day each subsequent week as tolerated. Titration to the minimum maintenance dose should be attempted over 5–7 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 25–50 mg/day weekly increments. The total daily dose should not exceed the maximum maintenance dose for each range of body weight (Table 2).

Table 2: Monotherapy Target Total Daily Maintenance Dosing for Patients 2 to 9 Years of Age
Weight (kg) Total Daily Dose (mg/day)* Minimum Maintenance Dose Total Daily Dose (mg/day)* Maximum Maintenance Dose
*
Administered in two equally divided doses
Up to 11 150 250
12 – 22 200 300
23 – 31 200 350
32 – 38 250 350
Greater than 38 250 400

Dosing in Adjunctive Therapy Epilepsy

Adults (17 Years of Age and Over)

The recommended total daily dose of TOPAMAX® as adjunctive therapy in adults with partial onset seizures or Lennox-Gastaut Syndrome 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. TOPAMAX® should 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 have not been shown to improve responses in adults with partial onset seizures.

Pediatric Patients 2 to 16 Years of Age

The recommended total daily dose of TOPAMAX® as adjunctive therapy for pediatric patients 2 to 16 years of age 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. The total daily dose should not exceed 400 mg/day.

Dosing in Migraine Prophylaxis

The recommended total daily dose of TOPAMAX® as treatment for patients 12 years of age and older for prophylaxis of migraine headache is 100 mg/day administered in two divided doses (Table 3). The recommended titration rate for TOPAMAX® for migraine prophylaxis is as follows:

Table 3: Migraine Prophylaxis Titration Schedule for Patients 12 Years of Age and Older
Morning Dose Evening Dose
Week 1 None 25 mg
Week 2 25 mg 25 mg
Week 3 25 mg 50 mg
Week 4 50 mg 50 mg

Dose and titration rate should be guided by clinical outcome. If required, longer intervals between dose adjustments can be used.

Administration Information

TOPAMAX® can be taken without regard to meals.

TOPAMAX® Tablets

Because of the bitter taste, tablets should not be broken.

TOPAMAX® Sprinkle Capsules

TOPAMAX® Sprinkle Capsules 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.

Dosing in Patients with Renal Impairment

In patients with renal impairment (creatinine clearance less than 70 mL/min/1.73 m2), one-half of the usual adult dose of TOPAMAX® is recommended [see Use in Specific Populations (8.5, 8.6), Clinical Pharmacology (12.3)].

Dosing in Patients Undergoing Hemodialysis

To avoid rapid drops in topiramate plasma concentration during hemodialysis, a supplemental dose of TOPAMAX® 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 [see Use in Specific Populations (8.7), Clinical Pharmacology (12.3)].

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