The purpose of this study was to determine whether combined treatment with liraglutide and metformin is more effective than liraglutide or metformin as monotherapy in the treatment of obese women with polycystic ovary syndrome (PCOS) who had been previously poor responders regarding weight reduction on metformin monotherapy. We anticipated greater changes in body weight in patients on combined treatment than in those on monotherapy with liraglutide or metformin.