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Cyproterone acetate is an antiandrogen i.e., it suppresses the actions of testosterone (and its metabolite dihydrotestosterone on tissues). It acts by blocking androgen receptors which prevents androgens from binding to them and suppresses luteinizing hormone (which in turn reduces testosterone levels). Its main indications are prostate cancer, benign prostatic hyperplasia, priapism, hypersexuality and other conditions in which androgen action maintains the disease process.