What can i take for upset stomach and diarrhea while breastfeeding?

Diarrhea/breastfeed: Women who are breast-feeding should avoid drugs that contain bismuth, such as pepto-bismol. Imodium (loperamide) is probably safe. for mild upset stomach and diarrhea, the best approach is to keep drinking water and eat simple easy-to-digest foods such as the brat diet (bananas, rice, applesauce, toast). See a doctor if you are vomiting, having bloody diarrhea, fever or chills.