EXHIBIT 32.1

     CERTIFICATION PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002
        (SUBSECTIONS (a) AND (b) OF SECTION 1350, CHAPTER 63 OF TITLE 18,
                               UNITED STATES CODE)

     Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (Subsections (a)
and (b) of Section 1350, Chapter 63 of Title 18, United States Code), each of
the undersigned officers of Alteon Inc. a Delaware corporation (the "Company"),
certifies, to the best of his or her knowledge, that the Company's Annual Report
on Form 10-K for the year ended December 31, 2005 (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.


Dated: March 30, 2006                   /s/ Kenneth I. Moch
                                        ----------------------------------------
                                        Kenneth I. Moch
                                        President and Chief Executive Officer


Dated: March 30, 2006                   /s/ Mary T. Phelan
                                        ----------------------------------------
                                        Mary T. Phelan
                                        Director of Finance and Financial
                                        Reporting

A signed original of this written statement required by Section 906 has been
provided to the Company and will be retained by the Company and furnished to the
Securities and Exchange Commission or its staff upon request.