There is no drug of choice for the treatment of functional diarrhea, and probiotics and antidiarrheal agents can be selected for treatment according to the condition, such as Bifidobacterium tetragonum tablets and Montelukast. Functional diarrhea refers to diarrhea without organic lesions and unknown causes. Because functional diarrhea has a lot to do with poor life and diet, such as irregular diet, eating stimulating food, cold, emotional fluctuations, etc., so patients with functional diarrhea should pay attention to the regulation of diet and lifestyle habits. Functional diarrhea can be treated with microecological agents to regulate the intestinal flora, such as Bifidobacterium bifidum quadruple live bacterial tablets, Bacillus licheniformis capsules, etc.; antidiarrheal drugs such as montmorillonite powder, compound Huanglianxin tablets, etc.; can also be used to gastrointestinal dynamics of the drugs such as Trimetoprim maleate, etc., which can be able to restore normal peristalsis function of the intestine, to achieve the purpose of alleviating the diarrhea. The above drugs should be used under the guidance of professional physicians. Functional diarrhea patients are recommended to seek timely medical treatment under the guidance of a professional physician.