|Exhibit 99.1


CERTIFICATION OF CEO
PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE
SARBANES-OXLEY ACT OF 2002


In connection with the Quarterly
Report on Form 10-Q of Dendrite International, Inc. (the Company) for the
quarterly period ended March 31, 2003 as filed with the Securities and Exchange Commission
on the date hereof (the Report), John E. Bailye, as Chief Executive Officer of
the Company hereby certifies, pursuant to 18 U.S.C. §1350, as adopted pursuant to
§906 of the Sarbanes-Oxley Act of 2002, that, to the best of his knowledge:


     (1)    
          The Report 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 Report fairly presents, in all material
          respects, the financial condition and results of operations of the Company.
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|JOHN E. BAILYE
Name:  John E. Bailye
Title:    Chairman of the Board and         
    Chief Executive Officer
Date:    May 15, 2003 |  | 
|------------------------------------------------------------------------------------------------------------------------------------------------- |  | 

|This certification accompanies the
Report pursuant to §906 of the Sarbanes-Oxley Act of 2002 and shall not, except to
the extent required by the Sarbanes-Oxley Act of 2002, be deemed filed by the Company for
purposes of §18 of the Securities Exchange Act of 1934, as amended.


A signed original of this written
statement required by §906 has been provided to the Company and will be retained by
the Company.
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

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|CERTIFICATION OF CFO
PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE
SARBANES-OXLEY ACT OF 2002


In connection with the Quarterly
Report on Form 10-Q of Dendrite International, Inc. (the Company) for the
quarterly period ended March 31, 2003 as filed with the Securities and Exchange Commission
on the date hereof (the Report), Kathleen E. Donovan, as Chief Financial
Officer of the Company, hereby certifies, pursuant to 18 U.S.C. §1350, as adopted
pursuant to §906 of the Sarbanes-Oxley Act of 2002, that, to the best of her
knowledge:


     (1)    
          The Report 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 Report fairly presents, in all material
          respects, the financial condition and results of operations of the Company.
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|KATHLEEN E. DONOVAN
Name:  Kathleen E. Donovan
Title:    Senior Vice President and Chief Financial Officer
Date:    May 15, 2003 |  | 
|---------------------------------------------------------------------------------------------------------------------------------------------- |  | 

|This certification accompanies the
Report pursuant to §906 of the Sarbanes-Oxley Act of 2002 and shall not, except to
the extent required by the Sarbanes-Oxley Act of 2002, be deemed filed by the Company for
purposes of §18 of the Securities Exchange Act of 1934, as amended.


A signed original of this written
statement required by §906 has been provided to the Company and will be retained by
the Company.
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------