Fenbuterol Red Tablets are estrogenic drugs that replenish estrogen and progesterone in the female body and promote the proliferation and secretory response of the endometrium. This drug contains estradiol 1mg and dydrogesterone 10mg. Estradiol, also known as kinetin and courtship hormone, has a strong sex hormone effect and is the most important sex hormone secreted by the ovaries to induce cellular synthesis of DNA, RNA and various different proteins in the corresponding tissues. Dydrogesterone is a progestin that brings the endometrium into full secretory phase, thus preventing the risk of estrogen-induced endometrial hyperplasia and carcinogenesis. The combination of these two components is mainly used for the treatment of clinical symptoms caused by perimenopausal hormone level disorders due to relatively low estrogen and progesterone and ovarian hypofunction.