[A case of steroid psychosis associated with betamethasone].

Psychotic side effects of steroids have been observed at relatively high frequency if mild cases, such as euphoria, are included, while it has been said that incidences differ among kinds of steroids. We reported a case developing severe schizophrenia-like symptoms following the treatment with betamethasone although this drug is believed to be rarely involved in steroid-induced psychosis, and its psychotic side effects have been rarely reported. When betamethasone was administered for progressive peripheral facial paralysis at a mean daily dose of 7mg, psychotic symptoms appeared from the 15th treatment day. Psychosis began with interrupted appearance of excitation, autism, and misanthropia. Although the steroid was gradually decreased in dose because of abatement of facial paralysis, not only psychotic symptoms were aggravated, but also appeared hallucination. Thus the steroid was withdrawn before the scheduled date while its dose was gradually decreased, and haloperidol was administered. Psychotic symptoms were gradually eliminated and completely disappeared about 40 days after onset.