Maralixibat (SHP625; formerly LUM001 or lopixibat) is a potent, apical, sodium‐dependent, bile acid transporter competitive inhibitor with minimal systemic absorption. Maralixibat works by reducing systemic levels of bile acids. In animal models of cholestasis, maralixibat blocked reabsorption of bile acids in the terminal ileum, thereby reducing enterohepatic recirculation to the liver and increasing fecal excretion of bile acids. Maralixibat is being evaluated as a treatment for children with rare cholestatic liver diseases, including Alagille syndrome (ALGS) and progressive familial intrahepatic cholestasis (PFIC).