Used to treat PCOS symptoms such as acne, excessive hair growth (hirsutism), and irregular periods. Cyproterone works by blocking a male hormone named androgen overproduction in the ovaries and reducing unwanted facial hair growth and acne. Ethinylestradiol. On the other hand, acts as an enhancer. It enhances the effect of cyproterone by reducing the amount of androgens in the blood. Collectively, they both effectively treat the symptoms of PCOS.