Tysabri is a brand-name prescription drug. It?s used in adults to treat:
- Relapsing forms of multiple sclerosis (MS). MS is an illness in which your immune system (your body?s defense against disease) attacks your central nervous system.
- Moderately to severely active Crohn?s disease if other treatments haven?t worked for you. Crohn?s disease is a kind of inflammatory bowel disease in which you have swelling in your digestive tract. And ?active? means that you currently have symptoms.
Tysabri contains the active drug natalizumab. This is a type of biologic drug (made from parts of living organisms) called an integrin receptor antagonist. Tysabri is an immunosuppressant drug. It lowers the activity of your immune system.