The main harmful effects of Orlistat are gastrointestinal adverse reactions such as flatulence and steatorrhea, which may rebound. It is recommended to take the medication on the advice of your doctor. Orlistat is a lipase inhibitor and is mainly used for the treatment of obese or overweight patients (body mass index ≥ 24). Common side effects include flatulence, urgency of stool, fatty stool, steatorrhea, increased frequency of bowel movements, fecal incontinence, etc. Liver impairment and menstrual disorders may also occur. Please take it according to the recommended dosage and do not increase the dosage without authorization. Continuous treatment to target weight can be combined with low calorie, low fat diet and exercise. If you stop taking Orlistat, you still need to continue to control diet and exercise. If weight regain occurs after discontinuing Orlistat, it can be continued in combination with diet and exercise. Orlistat should be taken under the supervision of a doctor and should not be taken on its own.