title: Analgesic development: a brief history and perspective.
mesh_terms: D000700:Analgesics / Q000266:history*; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000266:history; D001241:Aspirin / Q000266:history; D049673:History, 20th Century; D008614:Meperidine / Q000266:history; D009020:Morphine / Q000266:history; D009269:Nalorphine / Q000266:history; D010423:Pentazocine / Q000266:history
chemical_list: D000700:Analgesics; D000894:Anti-Inflammatory Agents, Non-Steroidal; D009020:Morphine; D008614:Meperidine; D001241:Aspirin; D010423:Pentazocine; D009269:Nalorphine