There are short-acting oral contraceptive pills and emergency contraceptive pills. Short-acting oral contraceptive pills are usually taken before going to bed, which is basically a fasting state at this time, because this pill needs to be taken every night, so it is more regular to take it before going to bed. However, if it is an emergency contraceptive pill, it is best to take it on an empty stomach. If you do not have an empty stomach at that time, you should take this pill two hours after the meal, and do not eat or drink water within two hours after taking the pill, if you eat or drink water, it will affect the absorption of the drug and may reduce the efficacy, because the success rate of the emergency contraceptive pill itself can only reach 85%-90%, so it is not completely able to play the role of contraception Therefore, it is not completely effective. If the efficacy is reduced, the incidence of contraceptive failure will increase even more.