title: On-demand analgesia. A double-blind comparison of on-demand intravenous fentanyl with regular intramuscular morphine.
mesh_terms: D000328:Adult; D002986:Clinical Trials as Topic; D004311:Double-Blind Method; D005283:Fentanyl / Q000008:administration & dosage* / Q000009:adverse effects; D006801:Humans; D007273:Injections, Intramuscular; D007275:Injections, Intravenous; D008875:Middle Aged; D009020:Morphine / Q000008:administration & dosage* / Q000009:adverse effects; D009325:Nausea / Q000139:chemically induced; D010149:Postoperative Pain / Q000517:prevention & control*; D011897:Random Allocation; D012129:Respiratory Function Tests; D013997:Time Factors
chemical_list: D009020:Morphine; D005283:Fentanyl