Sabril for Complex Partial Seizures in Adult Tolerability Study (TS) Patients

Inclusion Criteria: * The patient or patient's legally authorized representative must sign and date the Institutional Review Board approved Informed Consent and HIPPA Authorization Form. * Male and female patients 18+ years of age with a clinical diagnosis of Tuberous Sclerosis who experience an average of at least three partial seizures every two months, of which one must be a complex partial seizure * Patient must be on at least one and a maximum of four AEDs. Patient must be on a stable AED dose regimen for at least 30 days prior to screening. Neither a Vagal Nerve Stimulator (VNS) nor the ketogenic diet will count as an AED * In the investigator's opinion, the patient or caregiver must be able to keep a seizure diary * An MRI in the last 5 years, or willingness to undergo an MRI as part of the screening process Exclusion Criteria: * Cause of patient's seizures is a neurologic disease that is not Tuberous Sclerosis * Current, clinical diagnosis of a major depressive episode or suicidal ideation * Patient is taking more than four concurrent AEDs. Note: VNS or ketogenic diet is allowed and will not be counted in the four allowed AEDs * Patient has a progressive CNS lesion confirmed by magnetic resonance imaging (MRI) or computed tomography (CT) scan * Patient is currently abusing drugs or alcohol