Omeprazole capsule is not able to treat diarrhea, it is a proton pump inhibitor, mainly used to inhibit gastric acid secretion and protect gastric mucosa. It is widely used clinically for the treatment of reflux esophageal gastritis, acute erosive gastritis, gastric ulcer and even gastric cancer with excessive secretion of gastric acid. It is sometimes used in combination with antibiotics and pectin secretagogues to treat H. pylori infection. Diarrhea is usually caused by acute gastroenteritis, enteritis or irritable bowel syndrome, etc. It is mainly used to protect the mucous membrane as well as astringent and antidiarrheal drugs such as montelukast and enteritis nervosa. In addition, during diarrhea, pay attention to diet, do not eat spicy, stimulating and cold, greasy food.