Antin is an emergency contraceptive, Antin is the trade name and generic name is levonorgestrel tablets. It is taken orally, with the first tablet taken within 72 hours of intercourse and the second tablet taken 12 hours later, to prevent or delay ovulation, interfere with fertilization or prevent implantation. Emergency contraceptive pills are only effective as contraception for the current intercourse and reliable contraception should be used after taking the pills until the next menstrual period. Nausea, vomiting, and irregular vaginal bleeding may occur, and regular use can lead to menorrhagia and premature ovarian failure. Because it contains a large amount of hormones, it is only used as an emergency remedy for contraceptive errors and should not be used frequently as a regular method of contraception. If overdose and frequent use, it will easily lead to menstrual disorders and irregular bleeding. Try to use other contraceptive methods, do not take emergency contraceptive pills, and if you must take them, do not take them more than 3 times in a year, or more than 2 times in a month.