Multiple Sclerosis Drug Tysabri May Cause Rare Brain Disease. Yesterday, we reported that the FDA had been informed by Biogen Idec Inc. that a fourth person may have died from a rare and often fatal brain disease known as progressive multifocal leukoencephalopathy (PML).
embattled multiple sclerosis MS drug
After short-term treatment with its embattled ‘multiple sclerosis drug’ Tysabri.
Actually, that person remains alive and is currently being treated for the disease. Fatal brain disease known as progressive multifocal leukoencephalopathy (PML).
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