The company hired Paul Bisaro, former chairman at Allergan, to become CEO as Morgan Stanley helps explore alternatives, including a sale.
Paratek Pharmaceuticals soared while Foamix floundered ahead of market's open.
Chuck Grassley is hammering the privately held drug company on its $4,500 EpiPen competitor.
Impax Laboratories, Clearside Biomedical and Mylan were among the biotech stock movers in premarket trading Wednesday.
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