В тях Keppra при дози 1000, 2000 или 3000 mg дневно е сравнен с плацебо (сляпо лечение) в продължение на 12 до 14 седмици.
In these studies, Keppra at doses of 1,000, 2,000 or 3,000 mg per day, was compared with placebo (a dummy treatment) over 12 to 14 weeks.