Study Evaluating LAMICTAL Extended-Release Therapy Added To Current Seizure Treatments In Patients With Partial Seizures

Inclusion criteria: * Diagnosis of epilepsy with partial seizures for more than 24 weeks. * Must experience at least 8 partial seizures during an 8-week Baseline Phase. * Must currently be receiving treatment with a stable regimen of one or two antiepileptic drugs for at least four weeks. * Patient or parent/caregiver must be willing and able to maintain a written daily seizure diary. Exclusion criteria: * Previous treatment with lamotrigine. * Exhibits any primary generalized seizures. * Receiving treatment with felbamate or currently following the ketogenic diet. * Pregnant, breastfeeding, or planning to become pregnant.