In the postoperative anesthesia care unit, dimenhydrinate 25-50 mg, prochlorperazine 10 mg will be used should nausea, vomiting, or retching occur. Pain will be controlled by rectal acetaminophen 325mg-1.3 g. Patient controlled analgesia fentanyl will be administered to all patients at a lockout interval of 7 minutes. In the gynaecological ward, dimenhydrinate will be used to control nausea and vomiting.