COMMON USES: This medicine is a monoclonal antibody used to treat certain forms of multiple sclerosis (MS).  It is used to slow the worsening of physical disability and to reduce the number of symptom flare-ups.  This medicine is usually given to patients who cannot use other MS treatments or for whom other MS treatments do not work.  This medicine is also used to treat moderate to severe Crohn disease.  It may also be used to treat other conditions as determined by your doctor.