Ursine can be taken on the 5th-7th day of menstruation and once a day for 21 days, then it has contraceptive effect in clinical practice. Its contraceptive mechanism is to inhibit the normal ovulation of the ovaries and to make the endometrium thinner, which will prevent the fertilized egg from being laid, so it will achieve the purpose of contraception. After 21 days of continuous use, you will have your period 3-7 days after stopping the pill, and if you need to give birth control again on the 5th-7th day after your period, you need to take Eusebio. For example, if you have breast enlargement, tendency of blood clot, or high blood pressure, diabetes, or uterine fibroids, you should not take Eusebio to give contraception or do the corresponding treatment, because it may aggravate the symptoms of the original disease.