The 21-day short-acting oral contraceptive pill, the first box of pills to take more than 10 days in a row to have a contraceptive effect, more than 10 days every time you have intercourse has a contraceptive effect, its stop within 7 days also has a contraceptive effect. As long as you don’t miss it, you have to take 1 tablet every day for 21 days, stop for 7 days, start taking the second box on the 8th day, and so on according to this method of taking the pill, you don’t need to take extra condoms for contraception during intercourse. You must exclude contraindications to this drug, smoking, breast cancer or thrombosis, high blood pressure, liver function, kidney function abnormalities can not be eaten, annual review, abnormal conditions need to stop the drug, you can take the drug continuously, continuous eating until the age of 40.