title: What is analgesia?
mesh_terms: D000698:Analgesia; D000700:Analgesics / Q000494:pharmacology; D000818:Animals; D001241:Aspirin / Q000494:pharmacology; D001463:Barbiturates / Q000494:pharmacology; D001522:Behavior, Animal / Q000187:drug effects; D003216:Conditioning, Operant / Q000187:drug effects; D004285:Dogs; D006801:Humans; D008954:Models, Biological; D009020:Morphine / Q000494:pharmacology* / Q000627:therapeutic use; D009411:Nerve Endings / Q000187:drug effects; D010146:Pain / Q000188:drug therapy; D051381:Rats; D011984:Sensory Receptor Cells / Q000187:drug effects / Q000502:physiology; D009435:Synaptic Transmission / Q000187:drug effects
chemical_list: D000700:Analgesics; D001463:Barbiturates; D009020:Morphine; D001241:Aspirin