A 48-year-old woman received epidural anesthesia for vaginal hysterectomy. A fentanyl infusion was begun epidurally for relief of postoperative pain. About six hours later, she began to complain of nausea and had two episodes of vomiting.

How could the nausea and vomiting best be relieved? (Answer is posted in the comment section below!) *This patient case is from the Docplexus Editorial Team for educative purposes only.