Dear Healthcare Professional, Biogen ldec and Elan are writing to inform you of new safety information regarding TYSABRI" (natalizumab). The full Prescribing Information has been revised to add to the   more »

A letter posted to the Food and Drug Administration's Web site says that patients taking Tysabri, which is manufactured at a facility in Research Triangle Park, have developed signs of liver injury as soon as six days after taking their first dose.   more »