Breastfeeding women generally cannot take metronidazole because it may have adverse effects on the infant, such as adverse gastrointestinal reactions, allergies, and affect the baby’s liver function: 1. Adverse gastrointestinal reactions: metronidazole is an antibiotic drug for the treatment of anaerobic bacterial infections, with large side effects, and after a breastfeeding woman takes metronidazole, the drug can enter the infant’s body through breast milk. However, the infant’s own digestive system is not well developed, and the absorption of metronidazole can lead to gastrointestinal reactions, such as diarrhea, abdominal pain and other symptoms, and in serious cases, abdominal cramps; 2. The metabolism of metronidazole into the body can also affect the liver health of the baby. Breastfeeding women are a special group and the effects on the baby need to be taken into account when administering medication. If anti-inflammatory treatment is needed, the choice of medication should be made under the guidance of a medical professional. If special circumstances require the use of metronidazole, breastfeeding should be stopped to avoid adverse effects on the infant.