45-year-old women after the incident to prevent pregnancy available emergency contraceptive pills, this drug can not be used regularly, the body is very damaging. Emergency contraceptive pill, also known as morning-after pill, refers to the failure of contraceptive measures or contraceptive measures taken in a timely manner, in order to contraceptives used within 72 hours after intercourse and a class of drugs. It contains a large dose of progesterone, which can make the uterine lining thicken rapidly after taking it, thus blocking the embryo’s implantation process and achieving the contraceptive effect. Regular use of emergency contraceptive pills may interfere with the menstrual cycle and lead to menstrual disorders. Emergency contraceptive pills are generally not recommended as a regular method of contraception. Patients are advised to use emergency contraceptive pills under the supervision of a doctor and not to use them privately.