MIFEPRISTONE treats high blood sugar (glucose) in people with Cushing Syndrome, a condition that occurs when the body releases too much of the hormone cortisol. Cortisol helps your body respond to stress in many ways, including by telling your body to release more sugar into the body for energy. This medication works by reducing the effects of cortisol in your body, which decreases your blood sugar. Get Mifepristone for as low as $4,977.29, which is 81% off the average retail price of $26,335.52 for the most common version, by using a GoodRx coupon.