Intravenous Paracetamol or Morphine for the Treatment of Acute Flank Pain

STUDY OBJECTIVE: This randomized, controlled trial evaluates the analgesic efficacy and safety of intravenous single-dose paracetamol and morphine for the treatment of acute flank pain. METHODS: The investigators conducted a randomized, double-blind, controlled clinical trial comparing single intravenous doses of paracetamol (1 g) and morphine (0.1 mg/kg) for patients presenting to the emergency department (ED) with acute flank pain. Subjects with inadequate pain relief at 30 minutes received rescue fentanyl (0.75 microg/kg).