Estriol is used as estrogen drugs. Estriol is used for neutropenia, a variety of menstrual, senile vaginitis, menopausal syndrome.
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Estriol (E3), also spelled oestriol, is a steroid, a weak estrogen, and a minor female sex hormone. It is one of three major endogenous estrogens, the others being estradiol and estrone. Levels of estriol in women who are not pregnant are almost undetectable