The recovery of menstruation in women after Dafylline injection is related to the time of drug use, it will resume in about 2-4 weeks, or there may be a delay is normal, the effect of Dafylline on the uterus is to inhibit the growth of the endometrium, inhibit ovarian function, that is, after the use of Dafylline endometrial growth rate will be inhibited to a certain extent. The essence of women’s menstruation is caused by the shedding of the endometrial lining, which normally needs to reach a thickness of 1.1 cm or more before menstruation can occur, and the growth of the endometrial lining is significantly slowed down after Dafylline injection. Normally, the menstrual cycle is regular at about 4 weeks of menstruation, and after the drug is administered, it may take 3-4 weeks to get a period, which means that the drug will cause a delay in menstruation, but the specific arrival time cannot be determined.