February 6, 2010
WASHINGTON (Reuters) - The risk of a potentially fatal brain disorder with Biogen Idec Inc's multiple sclerosis drug Tysabri increases as patients receive more infusions, U.S. health officials warned on Friday.
The prescribing instructions for Tysabri will be updated to warn of the higher risk with more treatment, the Food and Drug Administration said. Elan Corp co-markets the drug.
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