Magnesium stearate is an organic compound commonly used as an additive in pharmaceuticals and in the production of pharmaceutical film coats, with lubricating, anti-adhesive, and flow-assisting effects, but no therapeutic efficacy; side effects include allergies, damage to the immune system, and gastrointestinal tract irritation. Effects of magnesium stearate: lubricating effect, tablets with magnesium stearate can pass through the esophagus into the stomach smoothly. Anti-adhesion effect, powdered or granular medicines have anti-adhesion effect after adding magnesium stearate. Aid to flow: liquid medicines have good flow when magnesium stearate is added, but have no therapeutic benefits. Side effects of magnesium stearate include allergic reactions, impairment of the immune system, and gastrointestinal irritation reactions. 1. Allergy: for patients with allergic body, allergic reactions such as chest tightness, itchy skin, and difficulty in breathing will occur after use. 2. Damage to the immune system: large amounts of magnesium stearate will affect the T-cell function, which will reduce the function of the human immune system. 3. Gastrointestinal tract irritation: taking a large amount of magnesium stearate will irritate the mucous membrane of the gastrointestinal tract and cause mucous membrane damage, which will lead to nausea, vomiting, diarrhea and other side effects. After the use of magnesium stearate, the occurrence of the above side effects, you need to stop using it immediately, go to the hospital in time for relevant examinations, and actively treat the symptoms.