title: Analgesics and their antagonists: recent developments.
mesh_terms: D000700:Analgesics / Q000037:antagonists & inhibitors; D000818:Animals; D001575:Benzomorphans / Q000494:pharmacology; D005283:Fentanyl / Q000494:pharmacology; D006801:Humans; D009019:Morphinans / Q000494:pharmacology; D009022:Morphine Derivatives / Q000494:pharmacology; D010455:Peptides / Q000494:pharmacology; D010880:Piperidines / Q000494:pharmacology; D011437:Propylamines / Q000494:pharmacology
chemical_list: D000700:Analgesics; D001575:Benzomorphans; D009019:Morphinans; D009022:Morphine Derivatives; D010455:Peptides; D010880:Piperidines; D011437:Propylamines; D005283:Fentanyl