EXHIBIT 32.1
CERTIFICATIONS
OF
PRINCIPAL EXECUTIVE OFFICER
Pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, the undersigned officer of Manhattan Pharmaceuticals, Inc. does hereby certify that, to the best of his knowledge:
(a) the Quarterly Report on Form 10-Q of Manhattan Pharmaceuticals, Inc. for the quarter ended June 30, 2011 (the “Report”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and
(b) information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of Manhattan Pharmaceuticals, Inc.
| Dated: August 15, 2011 | /s/ Michael G. McGuinness | |
| Michael G. McGuinness | ||
| Principal Executive and Financial Officer |