Efficacy and Safety of Tramadol Versus Morphine for Moderate and Severe Postoperative Pain With Special Regard to Respiratory Depression

The analgesic efficacy and safety of tramadol and morphine were compared in a double-blind, randomized study of 150 female patients after gynecologic surgery. As required, patients could receive up to three intravenous doses of either 50 mg of tramadol or 5 mg of morphine within a period of 6 h. Pai...

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