The timing of taking the medication depends on the disease being treated, mainly: 1. To protect the fetus, the symptoms of vaginal bleeding and abdominal pain in early pregnancy, such as pre-eclampsia, are mostly caused by luteal hypoplasia, at this time, the use of drospirenone tablets has a very good effect on preserving the fetus. It can be taken on the 10th day of the menstrual cycle for 12 days to adjust the menstrual cycle and protect the endometrium for 3 consecutive cycles. 3. for the treatment of endometrial polyps and endometrial hyperplasia for 3-6 months. 4. to induce menstruation, it can be taken orally for 3-5 days during the second half of the menstrual cycle to bring forward the menstruation.