Taking orlistat with oily stools is a common adverse reaction to the drug. Orlistat is a weight loss product commonly used by obese patients. It acts only on the gastrointestinal tract, mainly by inhibiting lipase in the gastrointestinal tract, reducing the absorption of fat in the diet by the intestinal mucosa and promoting the elimination of fat from the body to achieve the effect of weight loss. Eating orlistat stool oil is a normal phenomenon, in addition to other adverse reactions can also lead to. Adverse reactions 1, common adverse reactions: oily stool spots, increased gastrointestinal exhaust, stool emergency, fatty stool, fatty diarrhea, increased number of stools, fecal incontinence, abdominal pain, watery stools, soft stools, rectal discomfort, etc.; 2, rare adverse reactions: influenza, headache, menstrual disorders, anxiety, fatigue, etc.; 3, rare adverse reactions: hypersensitivity reactions, such as itching, rash, urticaria, angio neuroedema, liver failure, etc. Precautions 1, the emergence of severe or persistent abdominal pain, loss of appetite, itching, jaundice, dark urine and other symptoms, should immediately stop the drug, go to the hospital; 2, the use of drugs to lose weight may cause damage to the body, the current more scientific approach to weight loss is a combination of diet and exercise therapy, should eat fewer meals, less high-fat, high-sugar food, more aerobic exercise, such as running, rope skipping, etc..