Lamotrigine, marketed in the US as Lamictal by GlaxoSmithKline, is an anticonvulsant drug used in the treatment of epilepsy and bipolar disorder. It is also used as an adjunct in treating depression, though this is considered off-label usage. For epilepsy, it is used to treat partial seizures, primary and secondary tonic-clonic seizures, and seizures associated with Lennox-Gastaut syndrome. Like many other anticonvulsant medications, Lamotrigine also seems to act as an effective mood stabilizer, and in fact has been the only U.S. Food and Drug Administration (FDA)-approved drug for this purpose since lithium, a drug approved almost 30 years earlier...