title: New observations in the metabolism of morphine. The formation of codeine from morphine in man.
mesh_terms: D000284:Administration, Oral; D003061:Codeine / Q000096:biosynthesis* / Q000652:urine; D004361:Drug Tolerance; D006556:Heroin Dependence / Q000378:metabolism / Q000652:urine; D006801:Humans; D007275:Injections, Intravenous; D008297:Male; D009020:Morphine / Q000008:administration & dosage / Q000378:metabolism*
chemical_list: D009020:Morphine; D003061:Codeine