Cyproterone acetate

Cyproterone acetate (abbreviated as CPA), also sold under brand names such as Androcur among others, is a synthetic, steroidal antiandrogen, progestin, and antigonadotropin. It is primarily used in the treatment of androgen-related conditions by virtue of its ability to suppress androgenic activity in the body, an effect which it mediates by preventing endogenous androgens from interacting with the androgen receptor and by suppressing androgen biosynthesis. CPA is also used for its progestogenic effects, for instance, as a component of some combined oral contraceptive pills in combination with ethinyl estradiol, such as in Diane-35 among others.