There is no uniform definition of the time when a drug can be used for breastfeeding. According to the theory of drug clearance in the body, each drug has a half-life, which is the time required for the maximum concentration of the drug in the blood to be reduced by half, and it is usually believed that the drug can be completely cleared from the body after about 5 half-lives. If the half-life of a drug is about 6h, breastfeeding can be resumed after 30h. Lactating mothers should try to avoid taking drugs orally during breastfeeding, as more drugs can be metabolized through breast milk and have some effect on the development of the baby. How long you can continue breastfeeding after taking a drug during breastfeeding depends on the drug you are taking. Some medications have a low impact on the baby and can be nursed normally. However, it is better to stop breastfeeding for 1-2 days if the dose of the drug used is too high, which can cause infection of non-sensitive bacteria in the infant. For aminoglycosides and tetracyclines, antibiotics can have a greater impact on the child and breastfeeding should be strictly stopped until the drug is completely metabolized in the body before continuing. In addition, if the mother is sick, the child also needs to be protected to prevent infection.