some antacids may pass into breast milk. however no evidence exists that indicates that the ingestion of antacids through breast milk causes problems for nursing babies whose mothers use antacids occasionally. it is important that you check with your pharmacist about any possible interactions prior to taking an antacid. without knowing the name of a specific antacid it is difficult to say it is safe.
is there a safe over-the-counter antacid to use while nursing?