EXHIBIT 99.4


                            CERTIFICATION PURSUANT TO
            SECTION 1350, CHAPTER 63 OF TITLE 18, UNITED STATES CODE,
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

      Pursuant to Section 1350, Chapter 63 of Title 18, United States Code, as
adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, the
undersigned officer of Boston Life Sciences, Inc. (the "Company"), does hereby
certify that to his knowledge:

            1) the Company's Annual Report on Form 10-K for the period ended
      December 31, 2002 fully complies with the requirements of Section 13(a) or
      15(d) of the Securities Exchange Act of 1934; and

            2) the information contained in the Company's Annual Report on Form
      10-K for the period ended December 31, 2002 fairly presents, in all
      material respects, the financial condition and results of operations of
      the Company.

DATE: April 30, 2003                  /s/  Joseph P. Hernon
                                      -----------------------------------------
                                      Joseph P. Hernon, CPA
                                      Executive Vice President, Chief Financial
                                        Officer and Secretary