Emergency contraceptive pills are not just for one coitus, they are effective for multiple coitus within 72 hours of coitus.
Emergency contraceptive pills are highly effective progestin drugs, mainly through the inhibition of ovulation, disrupting the normal endocrine state and normal endometrial morphology, thus not conducive to the fertilization of the egg to bed, to achieve the purpose of contraception.
Generally, emergency contraceptive pills can play a contraceptive role for one or more times of sexual life within 72 hours, as long as the emergency contraceptive pills are taken in time within 72 hours after coitus, the effective contraceptive rate can reach 99%. However, if you take the emergency contraceptive pill and then have intercourse without contraceptive measures, it will not be able to play a contraceptive effect.
Emergency contraceptive pills have a lot of side effects, it is recommended not to take them frequently, you can use condoms and other methods of contraception.