This condition, typically spurred by parasites, viruses or migrating strains of nasty bacteria like E. coli orSalmonella, can cause dehydration, so experts say sufferers should strive to replace the fluids that are lost. One way to help: Give your child Pedialyte or other clear fluids to keep her hydrated. Let her eat small amounts of food if she’s hungry and not vomiting, but avoid milk or other dairy products. Anti-diarrheal drugs are not recommended for kids because they don’t seem to be effective, says Gardner. However, adults with diarrhea should stay hydrated with clear fluids and use an over-the-counter anti-diarrheal such as Imodium to head off problems. If either you or your child develop a fever, abdominal pain or blood in the stool, call your doctor, as this may signal a more serious condition.