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Postictal psychosis with forced normalization.

A 22-year-old female patient with epilepsy for more than six years who had prominent psychiatric manifestations, including paranoia, delusions and hallucinations, after a series of major seizure attacks caused by sudden withdrawal of anticonvulsant medication was monitored. This reported episode of psychosis occurred eight hours after the last seizure attack and lasted for two weeks. The psychosis gradually disappeared after administration of lorazepam. The electroencephalogram (EEG) performed during the period of psychosis showed intermittent slow activity in the bilateral frontal regions of the brain. There were active bisynchronous epileptiform discharges bisynchronously in both frontotemporal regions after the resolution of the psychotic episode. The clinical picture and course were consistent with the diagnosis of "postictal psychosis", and the transient near normal EEG during psychosis was most likely a phenomenon known as "forced normalization". The patient has not had a similar psychotic attack since the one reported here.