How TYSABRI Works

How TYSABRI Works: Mechanism of Action

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The exact way TYSABRI works is not fully understood but, TYSABRI is different and appears to work differently.

TYSABRI is an antibody, not an interferon (AVONEX^® (interferon beta-1a), Betaseron^® (interferon beta-1b), Extavia^® (interferon beta-1b), Rebif^® (interferon beta-1a)* or glatiramer acetate (Copaxone^®))*
TYSABRI is thought to inhibit white blood cells from getting into the brain and attacking nerves
Keeping these cells from attacking nerves is believed to result in fewer brain lesions that cause MS symptoms

*AVONEX is a registered trademark of Biogen Idec. All other trademarks are the property of their respective owners.

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