If the physician didn't have any information about this drug, why did he prescribe it? Why not an alternative? Ranitidine is acceptable for breastfeeding mothers for ulcer therapy. Is the physician playing it safe? No, if he were playing it safe, he would ask the mother to continue breastfeeding. There is very little information that I have, about this drug. But like most, it comes out in the milk in only tiny amounts. Play it safe! Continue breastfeeding. The risks of formula are definite, the risks of this drug in tiny amounts in the milk are not. Jack Newman, MD, FRCPC