A Double-blind, Randomized Conversion to Monotherapy Study to Evaluate the Efficacy and Safety of Brivaracetam in Subjects (≥ 16 to 75 Years Old) With Partial Onset Seizures

Inclusion Criteria: * Subjects from 16 to 75 years, both inclusive * Well-characterized focal epilepsy or epileptic syndrome * Subjects having at least 2 but not exceeding 40 partial onset seizures, whether or not secondarily generalized per 4 weeks during the 8-week Baseline Period * Subjects on a stable dose of at least 1 but no more than 2 concomitant Antiepileptic Drugs (AEDs) with the second AED ≤ 50 % of the minimum recommended maintenance dose Exclusion Criteria: * Seizure type IA non-motor as only seizure type * History or presence of seizures occurring too frequently or indistinctly separated to be reliably counted during the 6 months preceding Visit 1 or during Baseline * Other serious uncontrolled disease