It is often sold as Soliris 300mg in the market to treat certian diseases like peroxysmal noctural hemoglobinuria and Haemolytic uremic syndrome. Before administrating Eculizumab 300mg injection meningococcal vaccination should be given. Certain symptoms may appear which include rash, fever, chills, fatigue, UTI's.  Most side side effects do not need any medical attention, consult your doctor if the symptoms don't disapper with time.