Avonex Pharmaceutical Injury Lawyers

Biogen Idec Inc. and the U.S. Food and Drug Administration have announced that the multiple sclerosis drug Avonex may cause liver failure. The warning was issued on March 16, 2005.

Severe liver injury, including liver failure, was reported in rare cases among patients using Avonex, an MS drug that has been on the market since 1996 and has been used by about 130,000 patients.

Its manufacturer, Biogen, has not removed Avonex from the market but changed its label to carry a “warning” about possible liver damage. The Avonex label previously bore a milder advisory about liver damage.

The announcement about Avonex came just weeks after Biogen announced that it was suspending its more recently marketed multiple sclerosis drug Tysabri from the market following reports the medication may have caused a rare brain disease in two patients, one of whom died.

Biogen and its partner, Elan Corp., agreed to suspend Tysabri (formerly known as Antegren during clinical trials), while the FDA issued a public health advisory on Feb. 28, 2005 to inform patients and doctors about the potential problem with the prescription drug.

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This page was last updated on January 31, 2007.