Systematic review: Metformin vs. the combined oral contraceptive pill for hirsutism, acne, and menstrual pattern in polycystic ovary syndrome 16 Aug, 2020 | 22:11h | UTC Metformin versus the combined oral contraceptive pill for hirsutism, acne, and menstrual pattern in polycystic ovary syndrome – Cochrane Library Summary: Metformin versus the combined oral contraceptive pill for excessive facial/body hair, acne, and menstrual disorders in polycystic ovary syndrome – Cochrane Library