Deflazacort is used in the treatment of Inflammatory conditions, Autoimmune conditions, Cancer. View Deflazacort ’s uses , side-effects, drug interactions, expert advice and user FAQs only on 1mg.com. Deflazacort is a steroid that is used to treat Duchenne muscular dystrophy in adults and children at least 2 years old. Deflazacort is not a cure for muscular dystrophy, but deflazacort may improve muscle strength and slow the progression of disability. Deflazacort is a synthetic glucocorticoid with immunosuppressive and anti-inflammatory properties. It is widely used in the treatment of various autoimmune, inflammatory, and allergic conditions. Deflazacort (Emflaza) is used to treat Duchenne muscular dystrophy (DMD). Learn about side effects, drug interactions, warnings, and more.