Lack of menstrual flow can be caused by a variety of reasons, such as anovulatory abnormal uterine bleeding, uterine fibroids, and endometrial polyps, etc. Oral dydrogesterone stops the bleeding of anovulatory abnormal uterine bleeding within about 1 week, but oral dydrogesterone may not be effective for bleeding caused by uterine fibroids and endometrial polyps. Anovulatory abnormal uterine bleeding is caused by abnormal ovulation, high estrogen and low progesterone. Deferiprone is a progestin, which can stop the bleeding by converting the endometrium, which continues to proliferate under the action of estrogen, into a secretory phase. Most patients oral about 3 days bleeding significantly reduced, some people 4 ~ 5 days blood stop, usually not more than 1 week. Uterine fibroids or endometrial polyps belong to the occupying lesions, the reason why cause bleeding may be related to affect the uterine contraction or stimulate the endometrium irregular shedding, but not related to the endometrium continues to proliferate, so the oral treatment of dexmedroxyprogesterone is ineffective even if more than 1 week may still have irregular bleeding. The cause of bleeding must be identified before taking oral dextroprogesterone before taking the drug, and the drug should be used under the supervision of a doctor, even if the diagnosis of anovulatory abnormal uterine bleeding is confirmed, but hemoglobin is less than 80g/L, vital signs are not stable is not recommended to take orally, so as not to aggravate the anemia after stopping the withdrawal bleeding.