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Estramustine phosphate , also known as estradiol normustine phosphate and sold under the brand names Emcyt and Estracyt, is a dual estrogen and chemotherapy medication which is used in the treatment of prostate cancer in men. It is taken multiple times a day by mouth or by injection into a vein.
Side effects of EMP include nausea, vomiting, gynecomastia, feminization, demasculinization, sexual dysfunction, blood clots, and cardiovascular complications. EMP is a dual cytostatic and hence chemotherapeutic agent and a hormonal anticancer agent of the estrogen type. It is a prodrug of estramustine and estromustine in terms of its cytostatic effects and a prodrug of estradiol in relation to its estrogenic effects. EMP has strong estrogenic effects at typical clinical dosages, and consequently has marked antigonadotropic and functional antiandrogenic effects.
EMP was introduced for medical use in the early 1970s. It is available in the United States, Canada, the United Kingdom, other European countries, and elsewhere in the world.