Orlistat is not recommended for stomach problems. Orlistat mainly works to reduce fat absorption by inhibiting lipase activity and reducing the hydrolysis of fats (i.e. triglycerides) in food. And its adverse gastrointestinal reactions include increased gastrointestinal gas, steatorrhea, increased frequency of bowel movements, and abdominal pain. In patients with gastric ulcer and chronic gastritis, orlistat may aggravate abdominal pain symptoms. In patients with symptoms of dyspepsia, taking orlistat may cause more severe cases of steatorrhea, as well as potentially worsening abdominal bloating. If you need to use the drug, it is recommended to use the drug under the guidance of a doctor, not blindly self-medication to avoid adverse effects.