Deflazacort (trade name Calcort among others) is a glucocorticoid belonging to acetonides or O-isopropylidene derivative. It is used as an anti-inflammatory and was patented in 1969 and approved for medical use in 1985. The U.S. Food and Drug Administration (FDA) considers it to be a first-in-class medication for Duchenne Muscular Dystrophy.