Efficacy and Safety of Lacosamide as Adjunctive Therapy in Subjects ≥1 Month to <4 Years With Partial-onset Seizures

The trial consists of a 7-day Baseline Period, a 20-day Titration Period, a 7-day Maintenance Period, and a 12-day Transition Period for subjects who complete the study and choose to enter the extension study. Subjects who will not enter the extension study will continue after the Maintenance Period with a 16-day Taper Period followed by a 30-day Safety Follow-Up Period. The Taper Period and Safety Follow-Up are also applicable for subjects not eligible for continuation and therefore ending the study earlier. If subjects meet the eligibility criteria, they will be randomized to receive either lacosamide 8 mg/kg/day to 12 mg/kg/day, or placebo during the Maintenance Phase. The dose of lacosamide will be titrated from 4 mg/kg/day at study start to maximum of 12 mg/kg/day at 4-day intervals of 1-2 mg/kg/day. All subjects who complete the 20-day Titration Period will enter the 7-day Maintenance Period. No dose adjustment is allowed during the Maintenance Phase. The Treatment Phase is defined as the combined Titration and Maintenance Phases.