- To be enrolled, patient must have averaged at least 4 partial seizures per month, with no 21-day seizure-free period during the 2 months preceding randomization. To be randomized, the patient must have had at least 3 seizures during the prospective Baseline Phase (28 days), with no 21-day seizure-free period. This should be documented in the form of medical history, medical records, or photocopied records of the patient diary/patient chart. Simple partial seizures without motor signs will not be counted towards this inclusion criterion.