<B>Ravulizumab-cwvz (Ultomiris</B><SUP><B> </B></SUP><B>):</B> This is another drug approved by the FDA to treat PNH. It modifies the immune system so fewer red blood cells are broken down. It may raise your risk of infection. If you are taking Ultomiris, ask your health care provider for a patient safety card. This card will explain what to do if you have serious side effects.