 Part A Following establishment of initial eligibility and baseline measurements, patients will enter Part A at Visit 1 and will begin the two month baseline observation period. Patients will record their number of convulsive seizures, and of other seizures, using an IVRS telephone diary system recorded twice each day. Each call will take approximately five minutes to complete. Patients will return to the clinic at Visit 2 and the investigator will assess the patients daily number of convulsive seizures from the patients IVRS data. Patients who have experienced at least four convulsive seizures tonic-clonic seizures andor drop attacks per month for each of the previous two months and who meet all of the other inclusion exclusion criteria will be eligible to continue in the study. Patients will be asked for information regarding AEs, concomitant medications andor changes to their medication. 