If the pill expires, it will not work, it will not be clinically effective, and it may lead to other consequences, so it is important not to take the pill when it expires. It is also clinically recommended that if you have a history of hypertension or a tendency to blood clots, or are allergic to birth control pills, you should not take oral contraceptives, but take other methods of contraception. For example, you can get an IUD or use a condom during intercourse, which can also achieve good contraceptive effect. In the clinical oral contraceptive pill must be noted, if it is a short-acting contraceptive pill, start taking it on the fifth day of menstruation, and take it for twenty-one days continuously, in order to achieve the purpose of contraception in the clinical, and can only contraceptive take the pill this month. If it is an emergency contraceptive pill, it is taken within seventy-two hours after intercourse.