Multiorgan system failure caused by valproic acid toxicity.

Valproic acid is an effective antiseizure medication that is also used for other indications such as migraine prophylaxis. It is known to sometimes cause hepatic injury, both a mild dose-related form and an idiosyncratic, fulminant, usually fatal type. A case is reported of multiorgan failure caused by valproic acid toxicity in an adult who survived. Such multisystem toxicity has not been previously reported.