title: The analgesic activity of propoxyphene napsylate with and without aspirin.
mesh_terms: D000698:Analgesia; D000704:Analysis of Variance; D001241:Aspirin / Q000008:administration & dosage / Q000627:therapeutic use*; D002986:Clinical Trials as Topic; D011431:Dextropropoxyphene / Q000008:administration & dosage / Q000627:therapeutic use*; D004357:Drug Synergism; D006801:Humans; D009281:Naphthalenes; D010146:Pain / Q000188:drug therapy*; D010919:Placebos; D013451:Sulfonic Acids
chemical_list: D009281:Naphthalenes; D010919:Placebos; D013451:Sulfonic Acids; D001241:Aspirin; D011431:Dextropropoxyphene