For adults, Vimpat is usually started at 50 milligrams (mg) twice daily. The dosage can be increased to 100 mg twice a day after a week, then 150 mg twice a day for a week, then 200 mg twice a day. Dosage usually would be continued at 200 mg twice a day (400 mg per day total). For people who are particularly prone to medication side effects, the initiation may start more slowly. On the other hand, some patients with an urgent need to control seizures quickly might increase dosage faster than usual. You should plan the medication schedule with your doctor.