Treating relapsing forms of multiple sclerosis (MS) to reduce the number of flare-ups and slow down the development of physical disability associated with MS. Rebif is a protein identical to one found in the body. How Rebif works is not fully understood. It is thought to interfere with other chemicals in the body that cause flare-ups of MS.
Rebif contains synthetic interferons that help treat people who are relapsing with multiple sclerosis. While it does not cure MS, it may decrease a number of its symptoms.