RT Journal Article SR Electronic T1 STUDIES ON THE ENZYMATIC N-AND O-DEMETHYLATION OF NARCOTIC ANALGESICS AND EVIDENCE FOR THE FORMATION OF CODEINE FROM MORPHINE IN RATS AND DOGS JF Journal of Pharmacology and Experimental Therapeutics JO J Pharmacol Exp Ther FD American Society for Pharmacology and Experimental Therapeutics SP 265 OP 275 VO 144 IS 2 A1 Christian Elison A1 Henry W. Elliott YR 1964 UL http://jpet.aspetjournals.org/content/144/2/265.abstract AB Graphical analysis of the kinetics of demethylations of codeine and dextromethorphan suggests that there exist in the rat liver different enzymes which are involved in the N- and O-demethylations of these drugs. Experimental evidence is presented for the formation of codeine from morphine in vito and in vitro. The Williams & Wilkins Company