Contraceptive pills are required to be taken on an empty stomach or 2 hours after a meal, the effect is better. Because the emergency contraceptive pill belongs to a kind of estrogen and progesterone composition of the drug, when the drug in the entry, the stomach needs a space, need to be quickly absorbed, so fasting or 2 hours after the meal to take is better. If you take emergency contraceptive pills immediately after eating, because the contraceptive pill in the stomach stays a long time, and is not conducive to absorption, but also easy to be wrapped up by the food residue in the stomach, resulting in incomplete absorption, easy to be affected by the food each other, reducing the effect of contraceptive pills. Therefore, the contraceptive pill is generally required to need an empty stomach or 2 hours after meals, can be taken orally, so as to avoid reducing the effect.