Short-term contraceptives need to be taken every day because their mechanism of action is to inhibit the function of the endocrine axis at low doses for a long period of time. Short-term contraceptives usually have a short duration of effective blood concentration, and often need to be taken continuously in order to maintain a stable blood concentration for a period of time, in order to achieve interference with the pituitary ovary and other functions to inhibit ovulation, change the nature of cervical mucus, change the nature of the uterine lining, and other physiological changes, to achieve contraception. It should be noted that if cerebrovascular accident, myocardial infarction and other thrombotic diseases occur after taking the drug, the drug must be stopped immediately. The use of the drug is prohibited in the presence of thrombotic diseases, high risk of thrombosis, pregnancy, lactation, severe hepatic and renal dysfunction, severe hypertension. Short-term contraceptives need to be used under the guidance of a clinician, and should not be used without authorization.