title: Levomethadyl acetate: prolonged duration of opioid effects, including cross tolerance to heroin, in man. 1973 [proceedings].
mesh_terms: D000328:Adult; D004361:Drug Tolerance; D003932:Heroin / Q000037:antagonists & inhibitors*; D006556:Heroin Dependence / Q000503:physiopathology; D006801:Humans; D008297:Male; D008691:Methadone / Q000031:analogs & derivatives*; D008692:Methadyl Acetate / Q000494:pharmacology*; D008875:Middle Aged; D009294:Narcotics; D013375:Substance Withdrawal Syndrome; D013997:Time Factors
chemical_list: D009294:Narcotics; D003932:Heroin; D008692:Methadyl Acetate; D008691:Methadone