Explore Biogen treatments
Paying for treatment
Biogen Support Services
Your healthcare provider is your best source of information, especially when choosing treatment. Together, you decide what treatment may work best for you. Download these questions to help get the conversation started at your next appointment.
Prescribing Information, including Boxed
Warning and Medication Guide
Prescribing Information, including Boxed Warning and Medication Guide
TYSABRI is a prescription medicine used to treat relapsing forms of multiple sclerosis (MS), to include clinically isolated syndrome, relapsing-remitting disease, and active secondary progressive disease. TYSABRI increases the risk of progressive multifocal leukoencephalopathy (PML). When starting and continuing treatment with TYSABRI, it is important to discuss with your doctor whether the expected benefit of TYSABRI is enough to outweigh this risk.
It is not known if TYSABRI is safe and effective in children under 18 years of age.
See how TYSABRI was shown in clinical studies to impact:
Do not receive TYSABRI if you have PML or are allergic to natalizumab or any of the ingredients in TYSABRI.
Find out more about TYSABRI >
Learn more about how TYSABRI has been shown to treat relapsing MS.
Start a conversation with your doctor about your relapsing MS treatment.
Get TYSABRI tips and testimonials.
Before taking any treatment, it’s important to understand as much about it as possible. The Important Safety Information for a treatment describes possible side effects you may experience. It also tells you what information you need to share with your doctor before starting treatment.
On this website, the Important Safety Information appears on each specific treatment page. You'll also find the Indication, which explains the specific condition that the medication was approved to treat by the FDA.