title: The increased efficacy of narcotic antagonists induced by various narcotic analgesics.
mesh_terms: D000700:Analgesics / Q000494:pharmacology*; D000818:Animals; D003521:Cyclopropanes / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D004357:Drug Synergism; D007981:Levorphanol / Q000494:pharmacology; D008297:Male; D008691:Methadone / Q000494:pharmacology; D051379:Mice; D009019:Morphinans / Q000494:pharmacology; D009020:Morphine / Q000494:pharmacology; D009269:Nalorphine / Q000494:pharmacology; D009270:Naloxone / Q000494:pharmacology; D009292:Narcotic Antagonists / Q000494:pharmacology*; D009294:Narcotics / Q000494:pharmacology*; D011930:Reaction Time; D013997:Time Factors
chemical_list: D000700:Analgesics; D003521:Cyclopropanes; D009019:Morphinans; D009292:Narcotic Antagonists; D009294:Narcotics; D007981:Levorphanol; D009270:Naloxone; D009020:Morphine; D009269:Nalorphine; D008691:Methadone