The main reason for taking birth control pills for menstrual disorders is that they are caused by endocrine disorders, and birth control pills are a combination of estrogen and progestin. Applying birth control pills during endocrine disorders will increase exogenous estrogen and progestin and restore the menstrual cycle to a normal state. The vast majority of birth control pills are taken from the 5th day of menstruation, once a day for 21 days, to effectively regulate the endocrine situation. If you are treating irregular menstruation, you should take the pill for 3 consecutive menstrual cycles, which will effectively regulate your menstruation. In the process of taking the medicine, you must pay attention not to miss the dose. Before taking the medicine, you must go to the hospital and take the medicine under the guidance of the doctor to exclude the contraindication before taking the medicine.