Abstract
Biochemical studies on the urine of schizophrenic in-patients and out-patients have shown the drug rejection rate to vary from 5 per cent. to 32 per cent. in the U.K., U.S.A., and U.S.S.R. (3, 4, 8, 9, 11, 12). Even higher rejection rates (70 per cent.) were found with depressed out-patients (12), and high rejection rates have been found in antenatal patients prescribed ferrous sulphate, out-patients supposedly taking P.A.S. for their tuberculosis, and patients on drugs for rheumatoid arthritis (1, 2, 5, 6, 7).