QA51: What can I do to stop the diarrhea that happens when my child is on antibiotics?
There is really nothing that can be done to STOP that diarrhea, though sometimes you can lessen it with lactobacillus, which is an over-the-counter probiotic. But really the best thing would be to start lactobacillus when you start the antibiotics if your child is prone to getting diarrhea when they take an antibiotic. Taking lactobacillus does NOT effect the antibiotic at all and it is totally safe. – Steve Mendes, MD, MPH