Tildacerfont is a CRF1 receptor antagonist designed to potentially offer markedly improved disease control and reduced steroid burden in patients with classic congenital adrenal hyperplasia (CAH) and other diseases characterized by elevated levels of adrenocorticotropic hormone (ACTH). Tildacerfont binds to CRF1 receptors on the pituitary gland, inhibiting excessive production of ACTH, and ultimately limiting the production of adrenal androgens such as androstenedione, a precursor to testosterone.