Conditions: Epilepsy
Allocation: RANDOMIZED | Intervention model: PARALLEL
Enrollment: 21
Healthy volunteers: no

Brief summary:
Zonisamide is already marketed for the treatment of partial seizures in epilepsy. This study is intended to provide evidence that zonisamide is safe and effective in the treatment of primary generalised tonic-clonic seizures. The total trial duration will be 5.5-6.5 months. After that subjects who have completed the study will be eligible to enrol in an open-label extension study until zonisamide is marketed for this indication or further development in this indication stops. This extension study will be described in a separate protocol (E2090-E044-316).

Detailed description:

Arms:
arm 1: None arm 2: None

Interventions: intervention 1: Zonisamide intervention 2: Placebo
Intervention descriptions: intervention 1: 25-400 mg capsules orally once daily in the evening.

Maximum study duration of 28 weeks comprising:

Baseline Period (Week-8/-4 to Week 0) no treatment

Titration Period (Week 0 to Week 4) \<12 years old: 1 mg/kg; \>= 12 years old: 50 mg daily titrated weekly until a dose of 5 mg/kg or 300 mg was reached by Week 4

Maintenance Period (Week 4 to Week 16) dose from Week 4 to be maintained (4 mg/kg or 200 mg in the event of dose limiting adverse events)

Down Titration Period (4 weeks) intervention 2: 25-400 mg Zonisamide Placebo capsules orally once daily in the evening.

Maximum study duration of 28 weeks comprising:

Baseline Period (Week-8/-4 to Week 0) no treatment

Titration Period (Week 0 to Week 4) \<12 years old: 1 mg/kg Zonisamide Placebo; \>= 12 years old: 50 mg Zonisamide Placebo capsules daily titrated weekly until a dose of 5 mg/kg or 300 mg was reached by Week 4

Maintenance Period (Week 4 to Week 16) dose from Week 4 to be maintained (4 mg/kg or 200 mg in the event of dose limiting adverse events)

Down Titration Period (4 weeks)

Protocol document: