Medco Health Solutions (MHS) 10-Q 2003 Q2 Quarterly report

Exhibit 32.1

CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER

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, the undersigned officer of Medco Health Solutions, Inc. (the “Company”), hereby certifies that the Company’s Quarterly Report on Form 10-Q for the quarter ended June 28, 2003 (the “Report”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: September 19, 2003	By:	/s/ David B. Snow, Jr.
	Name:	David B. Snow, Jr.
	Title:	Chairman, President and Chief Executive Officer