Combination drug therapy for the psychogeriatric patient: comparison of dosage levels of the same psychotropic drugs, used singly and in combination.

The dosage levels for a number of frequently prescribed psychotropic drugs, used singly or in combination, were determined in 902 long-term psychogeriatric hospital patients. The data failed to support the hypothesis that physicians prescribe lower dosages when combination therapy is used. Rather, the tendency was toward higher dosages under these circumstances.