Metronidazole is not recommended in pregnancy because it can cross the blood-brain barrier and the placental barrier and can reach a certain level in breast milk and amniotic fluid. Clinically, if metronidazole enters the fetus through the placenta or in early pregnancy, it can have certain effects on the fetus, such as causing severe jaundice at birth or causing fetal developmental malformations. Try not to take metronidazole during pregnancy. In case of other discomfort during pregnancy, medication should be used only under the guidance of a doctor, because some drugs may have serious effects on the growth and development of the fetus, so care must be taken when using medication during pregnancy. In addition, not all drugs can be used after pregnancy, some drugs can still be applied, so be sure to consult your doctor before using them.