The study was done to evaluate the usefulness of sulbactam/cefoperazone (SBT/CPZ) injection for the treatment of infections in the field of obstetrics and gynecology. Fundamental and clinical studies were made and the following results were obtained. In the clinical studies, SBT/CPZ was given to 19 cases with female genital organ infections. As for the clinical effects, responses were excellent in 4 cases, good in 15 cases among 19 cases in total. The efficacy rate was 100%. The efficacy rate on disease was 100% in all cases (9 cases of puerperal uterine infection, 1 case of endometritis, 1 case of pyometra, 5 cases of adnexitis, 2 cases of pelveoperitonitis and 1 case of abscess of vulva). As for causative bacteria, the efficacy rate was 100% for all infections due to single or mixed infection, due to aerobic Gram-negative, -positive or anaerobic bacteria. Side effect was observed in 1 case with diarrhea. SBT/CPZ showed a satisfactory clinical efficacy and a potent bacteriological effect in treatment of the infection in the field of obstetrics and gynecology, and it has been concluded that SBT/CPZ will be a useful addition to the antibiotics for the therapy of these infections.