Has anyone ever heard of a mother experiencing diarrhea every time she breastfeeds her baby? Care Northwest (information line for drugs during pregnancy and lactation, serving the Pacific Northwest) received a call today about the safety of antidiarrhea medication during lactation. The mother, a 3-week post-cesarean multip, gets diarrhea with each nursing session. Sounds like a response to oxytocin to me (contractions of the muscles lining the colon?) but I couldn't find anything in the texts.