The 72-hour pill does not last for several days, it is a kind of emergency contraceptive pill, usually taken within 72 hours after sexual intercourse, the sooner you take it, the better the effect, only for this unprotected intercourse, not as a regular contraceptive measure to use. It is a remedy to prevent unintended conception in case of failure of contraceptive measures. It is a hormonal drug that can cause endocrine disorders in the body and lead to menstrual disorders, so it should not be taken regularly. It is not suitable for everyone and must be used under the guidance of a doctor. Do not abuse the drug, it will not only cause contraceptive failure, but also affect your health. It is recommended to use other safer forms of contraception, such as with condoms or IUDs.