Adult diarrhea is mostly due to enteritis, indigestion, irritable bowel syndrome, etc. It can be treated by oral antidiarrheal drugs, and should be treated for the cause as well as other symptomatic treatments. 1. Oral antidiarrheal drugs: you can choose montelukast, loperamide capsules and other drugs, with the adsorption of antidiarrheal effect, so as to alleviate the symptoms of diarrhea. 2. Treatment of the cause: if there is acute inflammation of the gastrointestinal tract should be selected according to the cause of the drug, if it is a bacterial infection, you can choose levofloxacin, ciprofloxacin and other antibiotics for treatment; if it is a bacterial imbalance, you can choose bifidobacterium triphylium enteric capsule, probiotic and other conditioning. 3. Symptomatic treatment: patients with abdominal pain can be combined with belladonna tablets to relieve intestinal spasms, and at the same time, if there are symptoms of dehydration, it should also be timely rehydration to prevent dehydration. Adults with diarrhea need to seek medical attention in a timely manner, and all medications need to be used under the guidance of a professional doctor to avoid abusing medications on their own.