Before induction of anesthesia , patients were randomly allocated to receive intravenously dexamethasone ( 8 mg ) in group D , ondansetron ( 4 mg ) in group O , metoclopramide ( 10 mg ) in group M , and saline ( 2 mL ) in group P. Total incidence of nausea and vomiting , rescue antiemetic requirement , pain scores , and any adverse effects were recorded at 3 observational periods ( 0-2 hours , 2-12 hours , and 12-24 hours ) .
