Vigabatrin and multifocal myoclonus in adults with partial seizures.

We report the appearance of multifocal myoclonus in two adult patients treated with vigabatrin as an add-on drug for complex partial seizures. The myoclonus subsided after dose reduction or discontinuation of the drug. There were no electroencephalogram correlates during the myoclonic jerks. This phenomenon may represent a apparently dose-related rare adverse drug event, similar to that seen occasionally with other anticonvulsants.