RALEIGH, N.C.--(BUSINESS WIRE)--Salix Pharmaceuticals, Ltd. (NASDAQ:SLXP) today announced that it has entered into an agreement to sell $300 million aggregate principal amount of its 2.75% convertible senior notes due 2015. In addition, Salix has granted the underwriters an overallotment option to purchase up to an additional $45 million aggregate principal amount of notes on the same terms and conditions.