Dexamethasone is a glucocorticoid drug, which is a long-acting hormone drug and can treat many diseases, but long-term use is not recommended. It can treat rheumatoid arthritis, ankylosing spondylitis, systemic lupus erythematosus, leukemia, allergic diseases, infectious diseases, toxic diseases, skin mucosal diseases, etc. Dexamethasone has a wide range of use and can be used for infections in all systems of the body, such as conjunctivitis, pharyngitis, pneumonia, bronchitis, etc. Glomerulonephritis, nephrotic syndrome, etc. require dexamethasone treatment. Hormonal drugs should not be used for a long time, and long-term use can lead to many adverse reactions. However, for chronic diseases that require long-term users, they must be used under the guidance of a professional physician, and they should not be reduced or increased on their own, so as not to lead to withdrawal reactions.