Yesterday, I noted that Biogen and Elan had taken their joint blockbuster drug, Tysabri, which treats MS, off the market temporarily because 2 patients had developed progressive multifocal leukoencephalophathy (PML). Each of these patients were taking another drug, and one of them has died from the condition.
Tysabri had been approved under the FDA's "fast-track" approval system, and some articles are now saying that this recent series of events may bring about another bout of hysteria about drug safety and call the FDA's fast-track system into question (this last link is to a WSJ article and requires a subscription). I say "poppycock" to that.
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