LEXINGTON, Mass.--(BUSINESS WIRE)--June 28, 2006--Cubist Pharmaceuticals, Inc. (Nasdaq: CBST - News) today announced that the company has repaid the outstanding principle and interest on its 5 1/2 % Convertible Subordinated Notes due 2008 (the "Notes") in accordance with the terms of the indenture governing the Notes. The $165.0 million principal amount outstanding was redeemed at $1,032.28 per $1,000 principal amount of Notes. The total payment was approximately $170.3 million, which includes principal, accrued interest and a prepayment penalty.