Ocrelizumab is used to treat relapsing-remitting and primary progressive multiple sclerosis (MS).
MS is caused by your immune system mistakenly attacking the myelin sheath in your brain and spinal cord. It is thought that specific types of B cells and T cells in your body are involved in the attack. Ocrelizumab sticks to the B cells and helps kill them. This stops them getting into your brain and spinal cord where they would attack the myelin covering around your nerves. This stops inflammation and damage to the nerve, reduces the chance of a flare-up and slows the progression of your disease. Read more about multiple sclerosis.