You do not mention the name of the medication, I think, unless my eyes have disconnected. However, the mother does *not* have to stop for most ulcer medication. Famotidine (available without prescription) Hale says is fine. From his information, I would say omperazole is fine too. Ranitidine is fine. Antacids are fine. The mother should take her medication and continue breastfeeding, or if it is not one of the drugs above, get it changed to one of the above. Jack Newman, MD, FRCPC