Dexamethasone Injection 20 ml contains dexamethasone, which is used to treat severe allergic conditions, collagen diseases, pulmonary disorders, blood disorders, rheumatic diseases, skin diseases, gastrointestinal disorders, etc. This medicine belongs to the corticosteroid class, which works by inhibiting the production of certain chemical messengers in the body that cause inflammation. Thus, it helps reduce swelling, redness, and itching.