Dexamethasone Injection 30 ML is used to treat severe allergic responses. Certain types of edoema, gastrointestinal disorders, and certain types of arthritis are treated with it. It reduces symptoms including edema and allergic responses by lowering your immune system's response to numerous infections. This is very effective and safe to use. It is also used as a test for Cushing's syndrome, an adrenal gland condition. Arthritis, blood/hormone issues, allergic reactions, skin diseases, cancer, and immune system disorders are all treated with dexamethasone.