BUZZ-Valeant Pharmaceuticals International Inc: Hits over 2-year low
** Beleaguered drugmaker's shares down 16 pct at $77.67 after briefly hitting over 2-year low
** A U.S. Senate panel launched on Wednesday a bipartisan probe into pharmaceutical pricing, seeking documents from 4 drugmakers including Valeant and Turing Pharmaceuticals, companies embroiled in controversy over price hikes on lifesaving drugs
** Valeant shareholder Bill Ackman said he told a company board member that longtime CEO Michael Pearson may have to go, Wall Street Journal reported (on.wsj.com/1Wxfmfd)
** Graphic: link.reuters.com/rup85w
** Up to Wednesday's close, Valeant had lost nearly two-thirds of its market value since its stock hit year-high on Aug. 6
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