title: Importance of initial pain in post-operative assessment of analgesic drugs.
mesh_terms: D000328:Adult; D000368:Aged; D000700:Analgesics / Q000009:adverse effects / Q000627:therapeutic use*; D000983:Antipyrine / Q000627:therapeutic use; D001241:Aspirin / Q000627:therapeutic use; D002110:Caffeine / Q000627:therapeutic use; D002986:Clinical Trials as Topic; D003061:Codeine / Q000627:therapeutic use; D005260:Female; D006801:Humans; D008614:Meperidine / Q000627:therapeutic use; D008875:Middle Aged; D010146:Pain / Q000188:drug therapy*; D010615:Phenacetin / Q000627:therapeutic use; D010919:Placebos; D011183:Postoperative Complications
chemical_list: D000700:Analgesics; D010919:Placebos; D002110:Caffeine; D008614:Meperidine; D010615:Phenacetin; D001241:Aspirin; D000983:Antipyrine; D003061:Codeine