Emergency contraceptive pills should be taken once in a month, or preferably no more than three times in a year, and should not be taken again for a short period of time. The main ingredients of emergency contraceptive drugs are estrogen and progestin, and the content is relatively large. If taken continuously within a short period of time, it may lead to endocrine disorders and menstrual disorders, and in serious cases, it may even affect future pregnancies. If you need to use contraception for a long time, you should take a practical and reliable contraceptive method. The female partner can take the measure of intrauterine device, which is safer and more convenient. Emergency contraceptive drugs are only occasionally used, mostly for unexpected sexual intercourse, afterwards for emergency contraception, because they can interfere with the fertilization of the egg and play a contraceptive role.