title: Emerging concepts concerning drug abuse.
mesh_terms: D000293:Adolescent; D000328:Adult; D000818:Animals; D002415:Cats; D003213:Conditioning, Psychological / Q000187:drug effects; D003496:Cyclazocine / Q000494:pharmacology; D004285:Dogs; D005059:Euphoria / Q000187:drug effects; D006168:Guinea Pigs; D006706:Homeostasis / Q000187:drug effects; D006801:Humans; D008954:Models, Biological; D019964:Mood Disorders / Q000523:psychology; D009021:Morphine Dependence / Q000209:etiology; D009271:Naltrexone / Q000627:therapeutic use; D051381:Rats; D011957:Receptors, Opioid / Q000187:drug effects; D019966:Substance-Related Disorders / Q000188:drug therapy / Q000209:etiology*
chemical_list: D011957:Receptors, Opioid; D009271:Naltrexone; D003496:Cyclazocine