If menstruation is delayed for more than 7 days, under the premise of ruling out pregnancy, you can use dydrogesterone tablets to induce menstruation, and most of them will have menstruation 3-7 days after stopping the medicine. If after stopping the drug still did not come to menstruation, it is recommended to observe for another 2 days, if the 9th day after stopping the drug still did not come to menstruation, you need to go to the hospital for further examination, mainly to exclude the possibility of premature failure of the ovarian function, once the ovarian function declines, even if the use of dydrogesterone tablets to promote menstruation, will not come to menstruation, to draw blood in a timely manner for the examination of sex hormone six, to understand the follicle stimulating hormone whether there is an abnormality of the increase, according to the results of the decision of the next step in the treatment. The next step should be decided according to the result. In addition, if you have normal menstrual periods and then suddenly experience menopause, it is recommended to rule out the possibility of pregnancy first. Pregnancy can cause delayed menstruation, and endocrine disorders can also cause delayed menstruation, so check the cause before using medication.