Miralax Breastfeeding Safety. Still, be sure to talk to your doctor before taking any drugs, including miralax, while you're breastfeeding. Miralax is considered safe to take if you're breastfeeding.

Stool softeners are safe because they are not absorbed through the intestines to any extent, and therefore are not found in breast milk. But is miralax safe while breastfeeding? Miralax may also be used for purposes not listed in this medication guide.