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Shares of ViroPharma (VPHM) sink 18.4% premarket after rivals Watson Pharmaceuticals and Akorn...

Shares of ViroPharma (VPHM) sink 18.4% premarket after rivals Watson Pharmaceuticals and Akorn (AKRX) both launch generic versions of Vancocin. The company says that it intends to file a complaint seeking an injunction to set aside the FDA approvals on the drugs and restore its exclusivity.
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