AstraZeneca’s rare disease arm Alexion agreed to resolve all patent disputes with Chugai Pharmaceutical regarding the prescription drug Ultomiris (ravulizumab) by signing a settlement agreement that will involve a one-time payment of $775 million. 

The U.S. Food and Drug Administration approved Alexion Pharmaceuticals Inc.’s Ultomiris for the treatment of atypical hemolytic uremic syndrome (aHUS) to inhibit complement-mediated thrombotic microangiopathy for adult and pediatric patients.