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About this Medication
  • Brand Name: Tysabri ® (formerly called Antegren)
  • Chemical Name: natalizumab (na-ta- lie -zoo-mab)
  • Usage in MS: Disease-Modifying Agent
  • Generic Available: No

This medication is given by IV infusion.


Tysabri® is a laboratory-produced monoclonal antibody. It is designed to hamper movement of potentially damaging immune cells from the bloodstream, across the “blood-brain barrier” into the brain and spinal cord.

Tysabri is approved by the U.S. Food and Drug Administration (FDA) as a monotherapy (not to be used in combination with other disease-modifying therapies) to treat relapsing forms of MS.

Click here to read the Tysabri Prescribing Information for healthcare professionals.

Click here to read the Tysabri Medication Guide for patients.


Above MS

Infusion Centers

Additional information about PML:

The PML Consortium

PML Registry

Financial Assistance Program

Above MS

Additional Resource

National Infusion Center Association - non-profit patient advocacy organization which offers an online Infusion Center Finder to locate centers throughout the U.S.