title: Narcotic analgesia--ceiling effect.
authors.forename: B
authors.initials: B
authors.lastname: Kay
mesh_terms: D000701:Analgesics, Opioid / Q000494:pharmacology*; D000758:Anesthesia; D000818:Animals; D004285:Dogs; D004305:Dose-Response Relationship, Drug; D006801:Humans; D011957:Receptors, Opioid / Q000187:drug effects*; D017473:Receptors, Opioid, kappa
chemical_list: D000701:Analgesics, Opioid; D011957:Receptors, Opioid; D017473:Receptors, Opioid, kappa