We evaluated the effects of suppositories of buprenorphine (BN) or NSAID (supp.) preoperatively administered for postoperative pain relief in patients who underwent elective gynecological surgeries. Fifty six patients were randomized into four groups: group B; 0.4 mg BN supp., group B+I; 0.4 mg BN supp. and 50 mg indomethacine (IND) supp., group B+D; 0.4 mg BN supp. and 50 mg diclofenac supp., group C; no supp. given as control. They were administered rectally after induction of general anesthesia. In all the supp. groups the patients had good pain relief during the first 24 hrs after the administration of supp. Group B+I seemed to have better pain relief, but, there was no statistical significance among the 3 groups. Nausea and vomiting were observed more frequently in group B and in control group C than in NSAIDs combined groups. The difference in the incidence rates was not significant. In conclusion, the simultaneous administration of BN and IND supp. was considered to be useful for postoperative pain relief without producing major side effects.