Not fasting before and after taking the emergency contraceptive pill may affect the effect of the drug. When taking the emergency contraceptive pill, it is usually best to fast for two hours before and after taking the pill, in order to increase the absorption rate of the pill and to improve its effectiveness. Another point that we need to pay attention to is to take the pill within 72 hours after unprotected sex, the earlier the pill is taken the better the effect is. The last point is that if you have vomiting two hours after taking the pill, it is best to take an additional pill. When taking this type of emergency contraceptive pill, there are some female diseases that are not suitable for taking this drug, such as those older than 40 years old, those with high blood pressure, diabetes and hyperlipidemia, and those with impaired liver and kidney function, the above people are not recommended to take the emergency contraceptive pill.