There are more types of birth control pills, and different types of pills are taken at different intervals. In the case of compounded short-acting contraceptives, the pill is taken once a day from the first 1-5 days of menstruation and 21 or 28 tablets are taken continuously for one cycle, and then the next cycle can be carried out when menstruation comes, without any interval in between. If it is an emergency contraceptive pill, patients are advised to take it at most three times a year and not more than twice a month, because emergency contraceptive pills are mostly highly effective hormones that can easily cause endocrine and menstrual disorders, which are more harmful to the body and are not recommended to be taken frequently. If it is a long-acting contraceptive pill, the method of taking it is once a month. If it is a visiting pill, it is only suitable for couples visiting relatives for a short time because of the large hormone content and side effects. In the early stage of taking the pill, some people may experience dizziness, headache, weakness, drowsiness, loss of appetite, nausea and vomiting, which are normal. If intolerant, they need to seek medical attention and change the contraceptive method.