• A Beydoun, J Fischer, D R Labar, C Harden, D Cantrell, B M Uthman, J C Sackellares, B Abou-Khalil, R E Ramsay, A Hayes, M Greiner, E Garofalo, and M Pierce.
• Department of Neurology, University of Michigan Medical Center, Ann Arbor, USA.
• Neurology. 1997 Sep 1;49(3):746-52.

AbstractThis study evaluated gabapentin monotherapy in 275 patients with medically refractory complex partial or secondarily generalized seizures who were taking one or two antiepileptic drugs (AEDs). Following an 8-week baseline, patients received randomized dosages of gabapentin (600, 1,200, or 2,400 mg/d) during a 26-week double-blind phase comprising 2 weeks gabapentin add-on therapy, an 8-week AED taper, and a 16-week gabapentin monotherapy period. Patients exited the study if they experienced a protocol-defined exit event. Results of outcome measures, including time to exit, completion rate, and mean time on monotherapy, showed no significant differences among dosage groups. Possible reasons for this lack of a dose-response relationship include withdrawal seizures and the limited range of gabapentin dosages studied. Overall, 20% of patients completed the study. Completion rates were higher among patients who had discontinued one AED (23%) than two AEDs (14%), and higher among patients who were not withdrawn from carbamazepine (27%) than among those who were (16%).

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