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Estradiol valerate/cyproterone acetate , sold under the brand names Climen and Femilar among others, is a combination product of estradiol valerate , an estrogen, and cyproterone acetate , a progestogen, which is used in menopausal hormone therapy and as a birth control pill to prevent pregnancy in women. It is taken by mouth. Climen, which is used in menopausal hormone therapy, is a sequential preparation that contains 2 mg estradiol valerate and 1 mg CPA. It was the first product for use in menopausal hormone therapy containing CPA to be marketed and is available in more than 40 countries. Femilar, which is an estradiol-containing birth control pill, contains 1 to 2 mg estradiol valerate and 1 to 2 mg CPA, and has been approved for use in Finland since 1993.
CPA alone has been found to suppress ovulation in 3 of 5 women at a dose of 0.5 mg/day and in 5 of 5 women at a dose of 1 mg/day. Ovulation inhibition with Femilar occurred in 94.4% of 108 women during the third treatment cycle in one study and in almost 100% of 26 women over 12 treatment cycles in another study.