www.fdanews.com/articles/122038-new-label-says-tysabri-risks-increase-over-time
New Label Says Tysabri Risks Increase Over Time
November 9, 2009
A brain infection linked to Biogen Idec Inc. and Elan Corp.’s Tysabri is more likely
to occur the longer patients use the multiple sclerosis drug, new prescribing information says.
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