Deflazacort is a corticosteroid used primarily in the treatment of various inflammatory conditions, including autoimmune diseases, allergic reactions, and some types of arthritis. It is also commonly prescribed for Duchenne muscular dystrophy (DMD) to help improve muscle strength and function. Deflazacort works by reducing inflammation and suppressing the immune system's overactive response. It is known to have a lower risk of certain side effects, such as weight gain and bone thinning, compared to other corticosteroids like prednisone. This makes it a preferred option in some chronic conditions where long-term steroid use is required.