In June 2009, Genentech, Inc. withdrew the psoriasis drug Raptiva from the market after it was linked to deaths of at least three patients from a rare but often fatal brain disease, progressive multifocal leukoencephalopathy (PML). Although 80% of people are said to harbor the virus that causes PML, the disease occurs almost exclusively in people with severely weakened immune systems. Raptiva is an immunosuppressant, as are many conventional drugs aimed at treating psoriaisis.
One more reason to try homeopathy first!
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