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Objective To evaluate the impacts of rosiglitazone and metformin on ovarian response, hirsutism and insulin action in women with polycystic ovary syndrome (PCOS). Methods Ninety women resistant to clomiphene citrate with PCOS were randomized, 40 cases to rosiglitazone group, 50 cases to meformin group. Rosiglitazone and metformon were administered for 6 months in combination with clomiphene citrate on cycle day 5th to 9th, respectively. The clinical evaluations were performed monthly. Reproductive hormone, serum glucose and insulin levels were observed before and after treatment. The data were analyzed using repeated analysis of variance (ANOVA). Results There were significant changes in reducing hirsutism score, serum testosterone level, LH/FSH ratio, and restoration of ovarian ovulation after metformin or rosiglitazone administration respectively (P