Epidural morphine has been used for postoperative analgesia. However, many side effects such as nausea, vomiting, pruritus, urinary retention, and delayed respiratory depression have been reported. 1-6 Although rare, delayed resporatory depression is the most serious complication and may occur several hours after the administration of epidural morphine.One(m-methylphenyl)-2-(dimethylaminoethyl)-cyclohexan-l-01(tramadol; Tramal*) 7 is a new synthetic opioid CAN J ANAESTH 1993 / 40:4 / pp 308-13

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