The study is a 63-month, randomized, double-blind trial of three antiepileptic drugs: carbamazepine, gabapentin, and lamotrigine. Patient recruitment occured during the first 51 months with each patient being followed for at least one year. There were 593 patients enrolled from 18 VA medical centers. Patients are veterans 60 years of age or older who have new onset, unprovoked seizures of focal onset, with or without secondary generalization. Patients with seizures secondary to toxic-metabolic causes, acute medical or neurological conditions or progressive diseases of the brain such as brain tumors are excluded. A double-dummy design is being employed to preserve the blind. Target doses for the study medications are: carbamazepine-600 mg., gabapentin-1500 mg., and lamotrigine-150 mg. Patients are assessed biweekly during the first 8 weeks, every 4 weeks until week 24 and every 8 weeks until week 52. Patients wishing to continue on their study drug after 52 weeks are seen quarterly for an additional year.