It can be taken about 2 hours after a meal, no food or water for 2 hours before and after taking it or about 4 hours after a meal, and reduce the amount of water you drink after taking it, so as not to dilute the effect of the drug. Emergency contraceptive pill side effects are relatively large, and is not recommended for long-term use, do not exceed 3 times a year, the use of too much easy to cause amenorrhea and endocrine disorders and other conditions, and even the possibility of infertility. Daily contraception can choose condoms, effective contraceptive rate of more than 95%, for women without physical harm, if allergic to condoms, can also choose short-acting contraceptive pills or wear the IUD and other methods. If there is a need to have children, it is not recommended to use IUD as it may cause damage to the uterine cavity.