Yes, you can take Alka-Seltzer while breastfeeding, but it's recommended to proceed with caution. Alka-Seltzer is a combination of aspirin, sodium bicarbonate and citric acid. Aspirin, which is found in Alka-Seltzer, can pass into breast milk in small amounts and may present potential risks 1 to nursing babies.
While the amounts of aspirin transmitted through breast milk are minimal, some research advises to steer clear, if possible. The American Academy of Pediatrics 2 , for instance, suggests avoiding aspirin during breastfeeding due to the risk, albeit very low, of Reye's syndrome in infants, a rare condition that can affect all organs of the body and could have serious implications.
The other ingredients, sodium bicarbonate and citric acid, aren't known to pose any direct risks to breastfed infants, but it's recommended to keep intake moderate.
In light of this, it's always best to speak with your healthcare provider about the safest options for relief from symptoms like heartburn, indigestion or headaches while breastfeeding.