Dexamethasone is a prescription corticosteroid medication used to reduce inflammation and suppress an overactive immune response. It works by decreasing the production and activity of substances in the body that contribute to inflammation. Dexamethasone may be prescribed for a variety of conditions, including certain allergic, inflammatory, respiratory, and immune-related disorders, depending on the patient’s specific needs. Benefits Helps reduce inflammation, swelling, and redness May relieve symptoms associated with certain severe allergic reactions Helps control inflammation associated with certain respiratory and inflammatory conditions Suppresses excessive immune system activity when medically appropriate Can provide relief from symptoms associated with a variety of corticosteroid-responsive conditions