L.L.
You need to find the root cause of the diaherra. He might have gastro intestinal issues that need to be looked at or an allergy of some kind. Lactose intolerance can cause this too. In the meantime rice and bananas are known to be binding. Yogurt is good as well since it contains good bacteria. I would also ask the doctor about pedialyte as this replaces important potassium and electrolytes lost from diaherra.