BUZZ-Valeant Pharmaceuticals International Inc: Appoints interim CEO
** Canadian drugmaker's U.S.-listed shares down 3 pct at $97.90 premarket
** Company appoints Howard Schiller interim chief executive, effective immediately
** Schiller steps in for Michael Pearson, who remains hospitalized with severe bout of pneumonia
** Valeant also appoints Robert Ingram interim chairman
** Company says timing of Pearson's return is uncertain and he will be on medical leave until further notice
** Up to Tuesday's close, stock had fallen about 11 pct since Dec. 24, last trading day before company announced its interim management team
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