300 MG Eculizumab Injection is a medication used to treat certain rare and serious disorders of the immune system, specifically paroxysmal nocturnal hemoglobinuria (PNH) and atypical hemolytic uremic syndrome (aHUS). This works by blocking the complement system, which helps to prevent the destruction of red blood cells (hemolysis) and reduce the risk of blood clots. It is a monoclonal antibody that targets and inhibits the complement system, which is part of the bodys immune response. In aHUS, 300 MG Eculizumab Injection helps to prevent abnormal activation of the complement system, which can lead to damage to blood vessels and organs, particularly the kidneys.