Contraceptive pills can cause contraceptive failure, mainly due to lack of regular use of the pill and missed doses. If the pill is used correctly, the success rate of contraception is up to 100%. The main types of contraceptive drugs are oral contraceptives, short-acting tablets, long-acting tablets and visiting tablets, long-acting contraceptive injections, combination contraceptive injections, monopregnant contraceptive injections, extended-release contraceptives, subcutaneous implants, and vaginal contraceptive rings. Contraceptive drugs mainly inhibit ovulation of the ovaries and are mainly steroidal hormonal contraceptives. The most common side effects are mainly early pregnancy-like reactions, irregular vaginal bleeding, amenorrhea, weight gain, skin pigmentation, headache, diplopia, breast tenderness and other discomforts, most of which do not require treatment.