The oils excreted with Orlistat are usually oils from food that have not been absorbed into the gastrointestinal tract. Orlistat is a specific gastrointestinal lipase inhibitor, which can inactivate gastric lipase and pancreatic lipase in the lumen of the stomach and small intestine, thus inhibiting pancreatic lipase, which helps to break down fats in the body, so that the fats contained in food can not be broken down and absorbed, and excreted through the stool. As a result, the oil excreted in orlistat capsules is usually the oil in the food that is not absorbed by the gastrointestinal tract. Orlistat is therefore functionally used as the main ingredient in weight-loss drugs, and long-term use can cause gastrointestinal reactions such as nausea, vomiting, loss of appetite, and uncontrollable bowel movements, so long-term use is not recommended. Contraindications for Orlistat include pregnant women, people who are allergic to the components of the drug, patients with chronic malabsorption syndrome, patients with cholestasis, and so on. Be sure to follow the doctor’s instructions to use the drug, not blindly on their own. If you need to take orlistat, it is recommended to follow the doctor’s instructions, and it is not recommended to take it blindly.