Dexamethasone is a glucocorticoid commonly used in clinical practice, with anti-inflammatory, anti-toxic, anti-allergic and anti-rheumatic effects, and is widely used in clinical practice, mainly for the treatment of allergic and autoimmune inflammatory diseases. Dexamethasone has anti-inflammatory and immunosuppressive effects, commonly used in the treatment of allergic and autoimmune inflammatory diseases. Such as connective tissue disease, severe bronchial asthma, dermatitis and other allergic diseases, ulcerative colitis, acute leukemia malignant lymphoma. It is also used in dexamethasone suppression tests. The use of the drug can cause infections, diabetes mellitus, Cushing-like syndrome and other adverse reactions. It is contraindicated in patients with a history of hypersensitivity to this product and adrenocorticotropic hormone analogs. It is contraindicated in patients with hypertension, thrombosis, gastric and duodenal ulcers, and glaucoma. Use with caution in pregnant and lactating women. Pay attention to the control of infection during the use of the drug, after long-term use of the drug, gradually reduce the dosage before stopping the drug. It is recommended that patients use it under the guidance of a doctor, and should not take it on their own to avoid adverse consequences.