“What medications help a dog with diarrhea?”

Imodium is an anti-diarrheal drug that may help with symptoms; however, this may not treat the underlying cause. Some causes of diarrhea include change in diet, parasites, infectious or immune-mediated disease. Bringing your dog to their primary care doctor is recommended to perform a fecal flotation (to rule out parasites) and bloodwork (to see if there's any concern for an infectious process).