title: Narcotic analgesics and antagonists.
mesh_terms: D000470:Alkaloids / Q000627:therapeutic use; D000700:Analgesics / Q000494:pharmacology*; D000818:Animals; D004361:Drug Tolerance; D003932:Heroin; D006801:Humans; D008956:Models, Chemical; D009019:Morphinans / Q000627:therapeutic use; D009292:Narcotic Antagonists / Q000494:pharmacology*; D010880:Piperidines / Q000627:therapeutic use; D011759:Pyrrolidines / Q000627:therapeutic use; D013329:Structure-Activity Relationship; D019966:Substance-Related Disorders / Q000188:drug therapy*
chemical_list: D000470:Alkaloids; D000700:Analgesics; D009019:Morphinans; D009292:Narcotic Antagonists; D010880:Piperidines; D011759:Pyrrolidines; D003932:Heroin