WASHINGTON (CNN) -- The government is warning that taking the psoriasis drug Raptiva could result in serious brain infection and even death. Raptiva may cause a serious brain infection called progressive multifocal leukoencephalopathy. The Food and Drug Administration cited three confirmed cases, and a possible fourth, of people diagnosed with progressive multifocal leukoencephalopathy (PML) after being treated with Raptiva. "Three of those patients have died," the FDA said in a public health advisory. "All four patients were treated with the drug for more than three years." None was receiving other treatments that suppress the immune system. Raptiva's product labeling was revised in October to highlight a boxed warning about the risks of life-threatening infections, including PML.
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NEW: European Medicines Agency discourages new Raptiva prescriptions
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Raptiva's product labeling was revised in October to highlight risks
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Raptiva is an injection for adults with moderate to severe plaque psoriasis
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The drug suppresses T-cells, which makes it decrease immune system function
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