BACKGROUND: Ketorolac has been used to inhibit some types of postoperative pain and reduce opioids requirement. The purpose of this study is to determine if the intravenous administration of ketorolac immediately before surgery would reduce pain in the immediately postoperative period. METHODS: The children were divided into three groups randomly. Two groups were anesthetized with propofol and fentanyl. The children of one of these group (group 2) received ketorolac 1 mg/kg during the induction of anesthesia. The children of third group received ketorolac 1 mg/kg during the induction of anesthesia and anesthetized with enflurane. Pain was assessed on the arrival in the recovery room and 15minute, 30minute and 60minute thereafter. RESULTS: Pain behavior score (PBS) and faces scale (FS) on the arrival in the recovery room in group 2 were lower than those of group 1 significantly. PBS and FS at 15 min, 30 min and 60 min after arrival in the recovery room in group 3 were higher than those of group 2. CONCLUSIONS: Intravenous administration of ketorolac during anesthetic induction has postoperative analgesia after tonsillectomy and adenoidectomy in 87 children.