About

Multiple sclerosis is an autoimmune disease in which the immune system attacks myelin, the protective insulation around nerve cells, disrupting how the central nervous system transmits signals and causing symptoms such as vision loss, muscle weakness, and problems with sensation and coordination. Ocrevus is an antibody given by infusion that binds to CD20, a protein on the surface of certain immune B cells, and removes them from circulation. Because those B cells are thought to drive the myelin attack, depleting them may reduce relapses and slow the nerve damage that builds up over time.