A 38 year-old presents to your office and reports that she was frightened this morning when she used the bathroom because ‘ she passed blood instead of urine’. Further questioning reveals she passed reddish-brown urine. For the last few weeks she has been experiencing headaches, trouble breathing, back pain, and palpitations. On physical examination, she appears somewhat pale, with normal vital signs.You ordered some laboratory tests to find the source of her symptoms. Her white blood cells and platelet counts are decreased and serum LDH is elevated. Peripheral blood film showed anisocytosis, anisochromia and poikilocytosis with notable ovalocytosis and spherocytosis. Bone marrow studies revealed cellular activity with increased erythropoiesis and marrow macrophages laden with iron-laden particles. Urinary sediment stained with Prussian blue showed intensely positive reactions reflecting urinary iron loss as a result of intravascular hemolysis. You suspected paroxysmal nocturnal hemoglobinuria in this patient and decided to use eculizumab. Of the following, which is true regarding eculizumab?
