Valeant Pharmaceuticals International 10-Q 2008 Q2 Quarterly report

Exhibit 32.1

Certification pursuant to 18 U.S.C. Section 1350,

As adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Pursuant to 18 U.S.C. Section 1350, each of the undersigned officers of Valeant Pharmaceuticals International hereby certifies, to the best of such officer’s knowledge, that:

1. The Registrant’s quarterly report onForm 10-Q for the quarter ended June 30, 2008 (the “Report”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended, and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of Registrant as of and for the periods presented in the Report.

/s/  J. Michael Pearson

J. Michael Pearson

Chairman and Chief Executive Officer

Date: August 11, 2008

/s/  Peter J. Blott

Peter J. Blott

Executive Vice President and Chief

Financial Officer

Date: August 11, 2008

A signed original of this written statement required by Section 906 has been provided to Valeant Pharmaceuticals International and will be furnished to the Securities and Exchange Commission or its staff upon request.