The authors conducted an open clinical trial of high doses of parenteral haloperidol in the treatment of 40 acutely excited psychotic inpatients. Their preliminary results suggest that intramuscular haloperidol in doses up to 60 mg. a day is safe, effective, and well tolerated in the management of such patients. Adverse reactions, which were infrequent, included extrapyramidal symptoms, lethargy, and, in one patient, transient hypotension.Abstract Teaser