Using a double-blind experimental design, two dosage regimens of haloperidol were compared in acutely decompensated, newly admitted schizophrenic patients. Patients in group A (n = 21) received 5 mg haloperidol tablets, patients in group B (n = 20) 15 mg haloperidol tablets. The number of tablets did not exceed six a day but could be varied according to the condition of each patient. On the average patients of group A were prescribed 4.0 tablets, corresponding to 20.0 mg haloperidol a day, and patients of group B 3.9 tablets, corresponding to 58.0 mg haloperidol a day. A significant amelioration of the psychopathology as measured by BPRS were observed in both groups. Between both groups investigated, no differences were found neither with regard to therapeutic efficacy nor to the tolerance of the treatment. Administration of higher oral haloperidol doses cannot be recommended as a standard procedure.

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