EXHIBIT 99.1

                                 CIMA LABS INC.

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

         In connection with Amendment No. 1 on Form 10-K/A to the Annual Report
of CIMA LABS INC. (the "Company") for the fiscal year ended December 31, 2001
filed with the Securities and Exchange Commission on the date hereof (the
"Report"), I, John M. Siebert, President and Chief Executive Officer of the
Company, certify, pursuant to 18 U.S.C. ss. 1350, as adopted pursuant to ss. 906
of the Sarbanes-Oxley Act of 2002, that:

         (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.


                                          /s/ John M. Siebert
                                          -------------------------------------
                                          John M. Siebert,
                                          President and Chief Executive Officer
                                          (Principal Executive Officer)