Acute high-dose parenteral haloperidol treatment of psychosis.

After 2 days of drug-free observation, 20 newly admitted psychotic patients received 20-35 mg of haloperidol intravenously and 20 patients received 30-40 mg of diazepam intravenously. Posttreatment ratings at 4 and 24 hours with the Brief Psychiatric Rating Scale and the Clinical Global Impressions revealed significant improvement in both groups but no significant differences between the two treatments.