Dayin 35 refers to ethinyl estradiol cyproterone tablets, which are to be taken from day 2-5 or day 1 of menstruation. Generally, ethinyl estradiol cyproterone tablets need to be taken at the same time every day in the direction indicated on the package, once a day for 21 days as a course of treatment. Generally, after one course of treatment, menstruation will occur in about 7 days after stopping the medication, and the second course of treatment will be started on the 1st day or the 2nd-5th day of the next menstruation. Because ethinyl estradiol cyproterone tablets can inhibit ovulation, they can also be used as a contraceptive during use. It should be noted that the medication should not be interrupted and should be taken regularly to avoid contraceptive failure or abnormal vaginal bleeding. It is recommended that patients who need to use the drug, under the guidance of a doctor to use, do not buy their own private take.