Tysabri (natalizumab) is a brand-name intravenous (IV) infusion that’s prescribed for multiple sclerosis. This article covers topics such as side effects, dosage, and how Tysabri works.

Tysabri (natalizumab) helps treat forms of multiple sclerosis and Crohn’s disease. The drug comes as an infusion solution. Tysabri is not safe to receive in pregnancy and may not be safe to ...