Yosmin, or drospirenone ethinyl estradiol tablets, can be taken in one box if it is for contraception; however, if it is for regulating the menstrual cycle, taking only one box will not usually achieve the desired effect. Drospirenone ethinyl estradiol tablets, generally one box is a course of treatment, if it is for contraception, then eat a box can play a role in contraception. However, if you take drospirenone ethinyl estradiol tablets to adjust the menstrual cycle, you generally need to take about 3 courses of treatment, only one box is generally not enough. It should be noted that drospirenone ethinyl estradiol tablets may cause adverse reactions such as nausea, dizziness and breast tenderness. It is prohibited for patients with abnormal endometrial hyperplasia, unexplained vaginal bleeding and so on. The medication should be used under the guidance of a doctor, and should not be used blindly.