Defrol 20000 IU is a high-dose formulation of Deflazacort, a corticosteroid used to manage conditions involving inflammation, autoimmune diseases, and certain muscle disorders like Duchenne muscular dystrophy (DMD). The 20000 IU strength refers to the concentration or dosage unit, indicating a more potent or specific dose of the medication. Deflazacort helps to reduce inflammation and modulate the immune system by suppressing excessive immune responses. While effective in managing chronic conditions like rheumatoid arthritis, lupus, and DMD, it is typically favored over other corticosteroids due to its relatively lower risk of causing weight gain, osteoporosis, and other side effects commonly associated with long-term steroid use. However, high doses like the 20000 IU formulation should be used cautiously under medical supervision to avoid potential adverse effects.