<unk>  (EU), also known as estradiol undecanoate and formerly sold under the brand names Delestrec and Progynon Depot 100 among others, is an estrogen medication which has been used in the treatment of prostate cancer in men. It has also been used as a part of hormone therapy for transgender women. Although<unk>  has been used in the past, it was discontinued and hence is no longer available. The medication has been given by injection into muscle usually once a month. Side effects of<unk>  in men may include breast tenderness, breast development, feminization, sexual dysfunction, infertility, fluid retention, and cardiovascular issues.<unk>  is a synthetic estrogen and hence is an agonist of the estrogen receptor, the biological target of estrogens like estradiol. It is an estrogen ester and a very long-lasting prodrug of estradiol in the body. Because of this, it is considered to be a natural and bioidentical form of estrogen. An injection of<unk>  has a duration of about 1 to 4 months.<unk>  was first described in 1953 and was introduced for medical use by 1956. It has been used in Europe as a parenteral estrogen to treat prostate cancer in men, although not as often as polyestradiol phosphate.
Estradiol undecylate
Estradiol dienantate
Estradiol enantate
Estradiol furoate
Estradiol valerate
Estradiol hemisuccinate
Estradiol diundecylenate
Estradiol dipropionate