<unk>  (EA), sold under the brand names Femtrace, Femring, and Menoring, is an estrogen medication which is used in hormone therapy for the treatment of menopausal symptoms in women. It is taken by mouth once daily or given as a vaginal ring once every three months. Side effects of<unk>  include breast tenderness, breast enlargement, nausea, headache, and fluid retention.<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 prodrug of estradiol in the body. Because of this, it is considered to be a natural and bioidentical form of estrogen.<unk>  was introduced for medical use in 2001. It is available in the United States and the United Kingdom. The formulation for use by mouth has been discontinued in the United States.
Estradiol acetate
Alfatradiol
Estradiol sulfate
Estradiol palmitate
Estradiol diundecylate
Estradiol valerate
Estradiol dipropionate
Estradiol dienantate