Dexamethasone sodium phosphate is a glucocorticoid drug that has anti-inflammatory, anti-allergic, anti-rheumatic and immunosuppressive properties. It reduces and prevents the tissue response to inflammation, thus reducing the manifestation of inflammation, and is able to inhibit inflammatory cells, thus providing a combined anti-inflammatory effect. In immunology, it prevents and inhibits cell-mediated immune responses, delays immune responses, reduces the production of immune-related cells such as lymphocytes and monocytes, and decreases immune responses, thus acting as an immunosuppressive agent. The drugs are mainly used for anti-allergy, anti-shock, anti-rheumatism, etc., which have immunosuppressive effects. Glucocorticoids have adverse reactions, such as dexamethasone, which are consistent with the common reactions of glucocorticoids, mainly including the following: 1. They can cause changes in glucose and lipid metabolism, and the use of glucocorticoids can easily lead to obesity, especially centripetal obesity. For example, obesity of the face and back.2. It can also lead to gastrointestinal reactions, which can induce peptic ulcers.3. Long-term or high-dose use of glucocorticoids can also easily lead to bone shrinkage, which may lead to severe femoral necrosis, which is also an irreversible reaction of glucocorticoids, that is, femoral necrosis. In conclusion, dexamethasone is a glucocorticoid drug, which usually has no obvious adverse reactions at physiological doses, but is prone to adverse reactions at pharmacological doses, i.e. at relatively high doses, which may involve multiple systems and organs, and the adverse reactions are closely related to the course and dose of the drug.