POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints DAVID PLATT, PH.D., and MAUREEN FOLEY, and each of them, his true and
lawful attorneys-in-fact and agents with full power to sign for him and in his
name, place and stead, in any and all capacities, any report required to be
filed by the undersigned with the Securities and Exchange Commission pursuant to
Section 16(a) of the Securities Exchange Act of 1934 (and any successor or
alternate provisions thereto) concerning changes in beneficial ownership of
securities of Pro-Pharmaceuticals, Inc. (on Form 4 or any other such form or
forms as may be designated by the Securities and Exchange Commission for such
purpose) and any and all amendments thereto and any and all exhibits and other
documents necessary or incidental in connection therewith, and to file the same
with the Securities and Exchange Commission, hereby granting to said
attorneys-in-fact and agents, and each of them, full power of substitution and
revocation in the premises, and generally to do and perform each and every act
and thing which they, or any of them, may deem necessary or advisable to
facilitate compliance by the undersigned with the provisions of said Section
16(a) of the Securities Exchange Act of 1934 (and any successor or alternate
provisions thereto), and all regulations of the Securities and Exchange
Commission thereunder, as fully and to all intents and purposes as he might or
could do in person, hereby ratifying and confirming all that said
attorneys-in-fact and agents or any of them, or any substitute or substitutes
for any or all of them, may do or cause to be done by virtue of these presents.

     IN WITNESS WHEREOF, the undersigned has hereunto executed this Power of
Attorney this 17th day of October, 2002.

                               /s/ Dale H. Conaway
                               Dale H. Conaway