What do preclinical studies show about the excretion of moxifloxacin into breast milk?

Preclinical data indicate that small amounts of moxifloxacin are secreted in milk; human lactation data are unavailable, and breastfeeding is contraindicated during moxifloxacin therapy because of this absence and the experimental risk of fluoroquinolone damage to immature animals’ weight-bearing cartilage.