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Pregnancy: Studies have not been done in humans. Metronidazole has not been shown to cause birth defects in animal studies; however, use is not recommended during the first trimester of pregnancy.
Breast-feeding: Use is not recommended in nursing mothers since metronidazole passes into the breast milk and may cause unwanted effects in the baby. However, in some infections the doctor may want the patient to stop breast-feeding and take this medicine for a short time. During this time the breast milk should be squeezed out or sucked out with a breast pump and thrown away. One or two days after the patient finish taking this medicine, the patient may go back to breast-feeding.
