Oral contraceptives can not drink alcohol, because contraceptives belong to the hormone drugs, in the 2 hours after the drug can not eat any food and water, and can not eat spicy and stimulating food, including alcohol, so as not to reduce the effect of emergency contraceptives, short-acting contraceptives. Because after taking oral contraceptives, it will have gastrointestinal disorders. If you drink alcohol at this time, it will accelerate the upset stomach, will cause vomiting, and may even help to reduce the effectiveness of the drug to a very low level, there may be ineffective. Therefore, it is important to pay attention to your diet and drink hot water, including hot porridge, two hours after taking the pill to avoid vomiting due to stomach discomfort, which can also affect the effectiveness of the pill. Contraceptive pills are not 100% contraceptive, it will have a certain chance of failure, as far as possible is 12 days after intercourse, take a test to rule out whether there is pregnancy.