Tysabri is an injectable prescription medication for adult patients with relapsing forms of Multiple Sclerosis
. It is proven to slow the worsening of physical disability, decrease the number of flare-ups, and reduce the number of brain lesions. Because it raises your risk of contracting a serious brain infection, Tysabri is generally recommended for patients who have not seen compelling results from, or cannot tolerate, other MS treatments. Tysabri is administered once every four weeks through intravenous infusion. In clinical studies, common side effects included headache, urinary tract infection, lung infection, pain in limbs, vaginitis, stomach area pain, fatigue, joint pain, depression, diarrhea, and rash. Your doctor should discuss other rare but potentially serious side effects and potential drug interactions with you prior to treatment.