A note on the effects of 2, 4-diamino-5-phenylthiazole and 1, 2, 3, 4-tetrahydro-9-aminoacridine on morphine metabolism

Abstract
Chromatographs of extracts of urine from patients receiving mixtures of morphine plus amiphenazole or morphine plus 1, 2, 3, 4-tetrahydro-9-aminoacridine (tha) have a spot which is due to a substance with properties similar to morphine-N-oxide. This spot was not present in urine of patients given morphine, amiphenazole or tha alone. Morphine-N-oxide may be a metabolite of morphine, and amiphenazole and tha may inhibit the further metabolism of morphine-N-oxide.