Relapsing MS Facts

Learn more about Relapsing MS

Relapsing multiple sclerosis (MS) is a disease that affects the central nervous system (CNS), which consists of the brain and spinal cord. It is sometimes mistaken for other illnesses and can take time to reach a proper diagnosis. However, an early diagnosis can help with managing symptoms and the impact of the disease. It's important to learn all you can about relapsing MS, its symptoms, and the treatment options that are available.

What is Relapsing MS?

Learn how MS affects people around the world and how the disease is affecting the body even in the absence of symptoms. What is MS?

Relapsing MS Signs and Symptoms

There are multiple symptoms of MS. Understand them, and see why your neurologist takes magnetic resonance imaging (MRI) scans to find out more about what's happening in the central nervous system. Relapsing MS Signs and Symptoms

Relapsing MS Treatment Options

From injections and infusions to oral medications, there are many treatment options available for relapsing forms of MS. To see which one might be right for you, talk with your healthcare provider. Relapsing MS Treatment Options

Relapsing MS Glossary

There are some common terms and phrases used with MS. To learn more about them, check out the relapsing MS glossary. Relapsing MS Glossary


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TYSABRI® (natalizumab) is a prescription medicine used to treat adults with relapsing forms of multiple sclerosis (MS) to slow the worsening of symptoms common in people with MS and to decrease the number of flare-ups (relapses). 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.

Important Safety Information

TYSABRI increases your risk of getting a rare brain infection—called progressive multifocal leukoencephalopathy (PML)—that usually leads to death or severe disability.

Before receiving TYSABRI, it is important to tell your doctor:
TYSABRI can cause serious side effects. If you have any of the symptoms listed below, call your doctor right away:
The most common side effects of TYSABRI are:
These are not all of the possible side effects of TYSABRI. For more information, ask your doctor. To report side effects to FDA, please call 1-800-FDA-1088.

Please see Full Prescribing Information (PDF) including Boxed Warning and Patient Medication Guide (PDF).

This information is not intended to replace discussions with your healthcare provider.