Precautions for taking birth control pills: 1. Drinking and eating is prohibited within two hours after taking the pill to avoid affecting the absorption of the drug and not achieving the contraceptive effect. 2. Do not drink alcohol, coffee, strong tea, etc., which can affect the absorption and metabolism of the contraceptive drug. 3. Taking the pill has nausea, vomiting and other gastrointestinal reactions, such as eating cold, spicy and irritating food can aggravate gastrointestinal discomfort. 4. 5.Emergency contraceptive pills have a lot of side effects and can cause abnormal vaginal bleeding and endocrine disorders, so they should not be used routinely.