title: Evaluation of fentanyl citrate, etorphine hydrochloride, and naloxone hydrochloride in captive polar bears.
mesh_terms: D000758:Anesthesia / Q000662:veterinary*; D000818:Animals; D002335:Carnivora; D005048:Etorphine / Q000494:pharmacology*; D005260:Female; D005283:Fentanyl / Q000494:pharmacology*; D007103:Immobilization; D008297:Male; D009019:Morphinans / Q000494:pharmacology*; D009270:Naloxone / Q000494:pharmacology*; D001503:Ursidae
chemical_list: D009019:Morphinans; D009270:Naloxone; D005048:Etorphine; D005283:Fentanyl