BUZZ-Valeant Pharmaceuticals: Up for third straight session
** Canadian drugmaker's U.S.-listed shares up 4.3 pct at $28.21; third straight session of gains
** U.S. shares closed up about 4 pct on Monday
** Short seller Andrew Left tells CNBC on Monday he is long on Valeant; Left in October equated Valeant with Enron, sending the stock plummeting (cnb.cx/1XicBN5)
** Company says on Monday will increase discounts to hospitals on heart drugs, Nitropress and Isuprel
** Toronto-listed stock up 4.9 pct at C$36.60, also third consecutive session of gains
** Up to Monday's close, U.S. shares had fallen 73 pct this year
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