Didrogestrel is a progestin, its role is to make the uterine lining shed. In the case of amenorrhea, if you take didrogestrel, you will get your period normally after 3-7 days of stopping the medication. However, if you take regional progesterone and do not have a period, it may be due to the following circumstances: i. Pregnancy. If you take drospirenone to protect your fetus after pregnancy, you will not have a period. Second, menopause may be imminent, with low ovarian function and reduced estrogen, so taking drospirenone will not work and you will not get your period. Third, if the endometrium is injured, if the endometrium is very thin or has adhesions, or if the endometrium has adhesions after multiple abortions, curettage or hysteroscopic surgery, you will not get your period even if you take dydrogesterone. So you should also look for the specific cause of non-menstruation after taking the medicine, to see which cause is caused, and treat the cause according to the symptoms.