Rebif is used to treat certain cases of multiple sclerosis, a chronic disease that affects the central nervous system, including the brain and spinal cord. Rebif is usually given to reduce the frequency of multiple sclerosis attacks and slow the progression of symptoms of the disease. It helps reduce the abnormal immune system activity that causes nerve damage.
Rebif is classified as one of the drugs belonging to the interferon beta group, which works to modify the immune system's response and reduce inflammation that occurs as a result of antibodies attacking nerve tissue.