The success rate of emergency contraceptive pill can only reach 85%-90%, and the earlier you take it, the better the effect. If some people are not sensitive to this drug or take the pill when it affects the absorption of the drug, it may also increase the rate of contraceptive failure. So it is best to take it on an empty stomach and eat and drink 2 hours afterwards to avoid reducing the efficacy of the drug. The emergency contraceptive pill works within 72 hours after the sex roll, but it doesn’t work if you take it more than 72 hours later, and it doesn’t work if you have sex again after taking this pill.