Novartis has secured approval in the US for Isturisa (osilodrostat), a new treatment for Cushing’s disease, a rare disorder in which the adrenal glands make too much of the cortisol hormone. Announcing the decision on 7 March, the Food and Drug Administration said that Isturisa is the first drug to directly address this cortisol overproduction by blocking the enzyme 11-beta-hydroxylase and preventing cortisol synthesis.