There is no most effective medicine for diarrhea in young children. Young children diarrhea can be seen in acute enteritis, inflammatory bowel disease, etc., commonly used intestinal mucosal protective agents, anti-secretory drugs, microecological agents, etc., at the same time, pay attention to adjust the diet. 1. Acute enteritis: commonly used drugs include intestinal mucosal protectants (such as montelukast), anti-secretory drugs (such as elimination of cathartic), microecological agents (such as bifidobacteria) and so on. If it is caused by bacterial infection, take antibacterial drugs (such as cefixime) and so on. 2. Inflammatory bowel disease: Commonly used drugs include aminosalicylic acid drugs such as mesalazine, which can control the inflammatory response. Diarrhea symptoms are severe, can take antidiarrheal drugs to relieve, such as montelukast. In addition, in the diet to drink more water, to ensure adequate water intake, eat more light, easy to digest food, avoid eating stimulating food. It is recommended that young children with diarrhea seek medical attention and active treatment in a timely manner. The above medication should be used under the guidance of a doctor.