There is no fixed time when you can breastfeed after using medication during breastfeeding, how long you can breastfeed is related to the specific medication used. If a breastfeeding woman uses quinolone antibiotics, commonly used norfloxacin, levofloxacin, etc., such drugs can be secreted through breast milk to further affect the child’s bone development, the drug’s half-life of 3 to 4 hours, after 5 half-life can continue to breastfeed, that is, stopping the drug more than 20 hours can be breastfeeding. If a breastfeeding woman uses gentamicin, the drug can lead to ototoxicity and nephrotoxicity after being secreted through breast milk, and there is a risk that the child will become deaf and have decreased renal function, generally after 24 hours, 50% to 90% of the drug will be excreted through the kidneys, and at this time, it is generally recommended to discontinue the drug for 48 hours before breastfeeding is safer. Clinically, if lactating women have the need for medication, should be carried out under the guidance of a professional physician, so as not to blindly use the drug, resulting in adverse consequences, the specific how long can breastfeeding is recommended to follow the doctor’s advice.