If you use Yosmin for contraception, a course of treatment is 21 days, often within 21 days of oral Yosmin, can inhibit ovarian ovulation and can change the thickness of the endometrium, thus preventing the fertilized egg will achieve the effect of contraception, but contraception time is only 1 month, if you want to continue to contraception in the next month you have to continue to take Yosmin. If you use Yosmin to treat menstrual disorders, you have to take it for 3 menstrual cycles and then stop taking it to make the ovaries restore the normal endocrine function and make the menstruation return to normal. It is recommended to take Yosmin for 3 consecutive menstrual cycles if you are treating menstrual disorders to achieve a better therapeutic effect accordingly.