Posthypoxic and postencephalitic myoclonus is often poorly controlled with
current treatments. The authors successfully treated three patients with po
sthypoxic and postencephalitic myoclonus by using levetiracetam, a new anti
epileptic drug. Levetiracetam appears to be a promising agent for treating
action myoclonus caused by hypoxic and encephalitic brain injury-the degree
of functional improvement may depend on the severity of associated motor d
ysfunction.