Sulbactam cefoperazone (SBT/CPZ), a combination drug of SBT and CPZ, was administered to 5 cases with obstetrical and gynecological infections in a daily dose of 2-6 g for 3-5 days. Clinical efficacy was good in 4 cases and poor in 1 case with adnexitis. Bacteriologically, organisms were detected in 2 out of 5 cases, beta-lactamase producing P. aeruginosa was detected in 1 case, but, their bacteriological responses were not clarified. Neither side effect nor abnormal laboratory findings due to this drug were observed. From the results we concluded that SBT/CPZ was an effective and safe antibiotic in the field of obstetrics and gynecology.