We wish to evaluate the efficacy of lamotrigine and gabapentin in the refractory mood disorders. We also wish to examine the neurobiology and phenomenology of lamotrigine and gabapentin responders and nonresponders to ascertain potential predictors and concomitants of response to these medications. This study may lead to improvement in the treatment and understanding of mood disorders by providing controlled data on efficacy of these potential new treatments, potential predictors of response, and further insights into the pathophysiology of mood disorders.