TG Therapeutics (TGTX) 10-Q 2008 Q2 Quarterly report

EXHIBIT 32.1

CERTIFICATION

OF

CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL OFFICER

Pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, each of the undersigned officers of Manhattan Pharmaceuticals, Inc. do hereby certify that, to the best of their knowledge:

(a)the Quarterly Report on Form 10-Q of Manhattan Pharmaceuticals, Inc. 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; 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 19, 2008	/s/ Douglas Abel
	Douglas Abel
	President and Chief Executive Officer
Dated: August 19, 2008	/s/ Michael G. McGuinness
	Michael G. McGuinness
	Chief Operating and Financial Officer