The expiration date of different contraceptives is not the same, some contraceptives are valid for three years, some contraceptives are valid for sixty months, depending on the expiration date specified in the instructions of the drug, the drug in the expiration date, as long as the preservation method is appropriate, there will not be a drug deterioration and expiration of the drug, the contraceptive pill in the expiration date in order to play the role of contraception. If the expiration date is exceeded, the contraceptive effect will be reduced, and there may be drug failure, in the use of drugs need to pay attention to the expiration date of the drug, if the expiration date has passed, do not take it, in order to avoid contraceptive failure. Different contraceptive pills are taken in different ways, some can be taken once, some need to be taken for a period of time, the drug should be taken according to the instructions.