Hi, I had gone through your question and understand your concerns. In this age, in most cases, diarrheas are caused by dietary causes or infectious ones. If this is caused by diet then he should try to rest more and switch to a diet of clear liquids. She should drink water, juice, bouillon and weak tea to avoid becoming dehydrated. Replace lost fluids and electrolytes with sports drinks. Avoid coffee or soft drinks that contain caffeine, since caffeine increases the loss of water and salt. If she has nausea in addition to diarrhea, take very small sips of fluid frequently and suck on ice chips. She also may consider over-the-counter medications such as bismuth subsalicylate (Pepto-Bismol) or loperamide (Imodium).In cases of infectious diarrheas, you should do microbiologist testing of stool and see the exact microbe and then antibiotics can be used additionaly. Hope this answers your question. If you have additional questions or follow up questions then please do not hesitate in writing to us. I will be happy to answer your questions. Wishing you good health.