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                                                                     Exhibit 4.4

                            STOCK PURCHASE AGREEMENT

CIMA Labs Inc.
10000 Valley View Road
Eden Prairie, Minnesota  55344

The undersigned (the "Investor"), hereby confirms its agreement with you as
follows:

1.   This Stock Purchase Agreement (the "Agreement") is made as of the date set
     forth below between CIMA Labs, Inc., a Delaware corporation (the
     "Company"), and the Investor.

2.   The Company has authorized the sale and issuance of up to 1,200,000 shares
     (the "Shares") of common stock of the Company, $.01 par value per share
     (the "Common Stock"), subject to adjustment by the Company's Board of
     Directors, to certain investors in a private placement (the "Offering").

3.   The Company and the Investor agree that the Investor will purchase from the
     Company and the Company will issue and sell to the Investor 108,900 shares,
     for a purchase price of $19.00 per share, or an aggregate purchase price of
     $2,069,100, pursuant to the Terms and Conditions for Purchase of Shares
     attached hereto as Annex I and incorporated herein by this reference as if
     fully set forth herein. Unless otherwise requested by the Investor,
     certificates representing the Shares purchased by the Investor will be
     registered in the Investor's name and address as set forth below.

4.   The Investor represents that, except as set forth below, (a) it has had no
     position, office or other material relationship within the past three years
     with the Company or its affiliates, (b) neither it, nor any group of which
     it is a member or to which it is related, beneficially owns (including the
     right to acquire or vote) any securities of the Company and (c) it has no
     direct or indirect affiliation or association with any NASD member.
     Exceptions: The Investor currently beneficially owns 189,200 shares of
     common stock of the Company. Delaware Distributors, L.P., a limited purpose
     broker-dealer, is the Investor's distributor and an NASD member.

Please confirm that the foregoing correctly sets forth the agreement between us
by signing in the space provided below for that purpose.

                                  DATED AS OF:  March 13, 2000

                                  Delaware Group Equity Funds III, on behalf
                                  of its Delaware Trend Fund

                                  By:   /s/ Gerald S. Frey
                                     ---------------------
                                  Print Name:  Gerald S. Frey
                                  Title:  Senior Vice President
                                  Address:  1818 Market Street, Philadelphia,
                                  Pennsylvania  19103

AGREED AND ACCEPTED:
CIMA LABS INC.

By:     /s/ John M. Siebert
        -------------------
        John M. Siebert

Title:  President and Chief Executive Officer<PAGE>   1

                                                                     Exhibit 4.5

                            STOCK PURCHASE AGREEMENT

CIMA Labs Inc.
10000 Valley View Road
Eden Prairie, Minnesota  55344

The undersigned (the "Investor"), hereby confirms its agreement with you as
follows:

1.   This Stock Purchase Agreement (the "Agreement") is made as of the date set
     forth below between CIMA Labs, Inc., a Delaware corporation (the
     "Company"), and the Investor.

2.   The Company has authorized the sale and issuance of up to 1,200,000 shares
     (the "Shares") of common stock of the Company, $.01 par value per share
     (the "Common Stock"), subject to adjustment by the Company's Board of
     Directors, to certain investors in a private placement (the "Offering").

3.   The Company and the Investor agree that the Investor will purchase from the
     Company and the Company will issue and sell to the Investor 60,600 shares,
     for a purchase price of $19.00 per share, or an aggregate purchase price of
     $1,151,400, pursuant to the Terms and Conditions for Purchase of Shares
     attached hereto as Annex I and incorporated herein by this reference as if
     fully set forth herein. Unless otherwise requested by the Investor,
     certificates representing the Shares purchased by the Investor will be
     registered in the Investor's name and address as set forth below.

4.   The Investor represents that, except as set forth below, (a) it has had no
     position, office or other material relationship within the past three years
     with the Company or its affiliates, (b) neither it, nor any group of which
     it is a member or to which it is related, beneficially owns (including the
     right to acquire or vote) any securities of the Company and (c) it has no
     direct or indirect affiliation or association with any NASD member.
     Exceptions: The Investor currently beneficially owns 100,000 shares of
     common stock of the Company. Delaware Distributors, L.P., a limited purpose
     broker-dealer, is the Investor's distributor and an NASD member.

Please confirm that the foregoing correctly sets forth the agreement between us
by signing in the space provided below for that purpose.

                                     DATED AS OF:  March 13, 2000

         Delaware Group Premium Fund, on behalf of its Trend Series

                                     By:    /s/ Gerald S. Frey
                                          -------------------------------------
                                     Print Name:  Gerald S. Frey
                                     Title:  Senior Vice President
                                     Address:  1818 Market Street, Philadelphia,
                                     Pennsylvania  19103
AGREED AND ACCEPTED:
CIMA LABS INC.

By:    /s/ John M. Siebert
       -------------------
       John M. Siebert

Title: President and Chief Executive Officer<PAGE>   1

                                                                     Exhibit 4.6

                            STOCK PURCHASE AGREEMENT

CIMA Labs Inc.
10000 Valley View Road
Eden Prairie, Minnesota  55344

The undersigned (the "Investor"), hereby confirms its agreement with you as
follows:

1.   This Stock Purchase Agreement (the "Agreement") is made as of the date set
     forth below between CIMA Labs, Inc., a Delaware corporation (the
     "Company"), and the Investor.

2.   The Company has authorized the sale and issuance of up to 1,200,000 shares
     (the "Shares") of common stock of the Company, $.01 par value per share
     (the "Common Stock"), subject to adjustment by the Company's Board of
     Directors, to certain investors in a private placement (the "Offering").

3.   The Company and the Investor agree that the Investor will purchase from the
     Company and the Company will issue and sell to the Investor 29,400 shares,
     for a purchase price of $19.00 per share, or an aggregate purchase price of
     $558,600, pursuant to the Terms and Conditions for Purchase of Shares
     attached hereto as Annex I and incorporated herein by this reference as if
     fully set forth herein. Unless otherwise requested by the Investor,
     certificates representing the Shares purchased by the Investor will be
     registered in the Investor's name and address as set forth below.

4.   The Investor represents that, except as set forth below, (a) it has had no
     position, office or other material relationship within the past three years
     with the Company or its affiliates, (b) neither it, nor any group of which
     it is a member or to which it is related, beneficially owns (including the
     right to acquire or vote) any securities of the Company and (c) it has no
     direct or indirect affiliation or association with any NASD member.
     Exceptions: The Investor currently beneficially owns 53,300 shares of
     common stock of the Company. Mitchell Hutchins Asset Management Inc.
     (MHAM), the Investor's manager is an NASD member. MHAM is a wholly-owned
     subsidiary of PaineWebber Incorporated, which is also an NASD member.

Please confirm that the foregoing correctly sets forth the agreement between us
by signing in the space provided below for that purpose.

                                     DATED AS OF:  March 13, 2000

                  Delaware Management Company, sub-investment adviser on behalf
of PACE Small/Medium Company Growth Equity Investments

                                     INVESTOR

                                     By:    /s/ Robert J. DiBraccio
                                     Print Name:  Robert J. DiBraccio
                                     Title:  Senior Vice President
                                     Address:  1818 Market Street, Philadelphia,
                                     Pennsylvania  19103

AGREED AND ACCEPTED:
CIMA LABS INC.

By:    /s/ John M. Siebert
       -------------------
       John M. Siebert

Title: President and Chief Executive Officer<PAGE>   1

                                                                     Exhibit 4.7

                            STOCK PURCHASE AGREEMENT

CIMA Labs Inc.
10000 Valley View Road
Eden Prairie, Minnesota  55344

The undersigned (the "Investor"), hereby confirms its agreement with you as
follows:

1.   This Stock Purchase Agreement (the "Agreement") is made as of the date set
     forth below between CIMA Labs, Inc., a Delaware corporation (the
     "Company"), and the Investor.

2.   The Company has authorized the sale and issuance of up to 1,200,000 shares
     (the "Shares") of common stock of the Company, $.01 par value per share
     (the "Common Stock"), subject to adjustment by the Company's Board of
     Directors, to certain investors in a private placement (the "Offering").

3.   The Company and the Investor agree that the Investor will purchase from the
     Company and the Company will issue and sell to the Investor 1,100 shares,
     for a purchase price of $19.00 per share, or an aggregate purchase price of
     $20,900, pursuant to the Terms and Conditions for Purchase of Shares
     attached hereto as Annex I and incorporated herein by this reference as if
     fully set forth herein. Unless otherwise requested by the Investor,
     certificates representing the Shares purchased by the Investor will be
     registered in the Investor's name and address as set forth below.

4.   The Investor represents that, except as set forth below, (a) it has had no
     position, office or other material relationship within the past three years
     with the Company or its affiliates, (b) neither it, nor any group of which
     it is a member or to which it is related, beneficially owns (including the
     right to acquire or vote) any securities of the Company and (c) it has no
     direct or indirect affiliation or association with any NASD member.
     Exceptions: The Investor currently beneficially owns 1,400 shares of common
     stock of the Company. Delaware Distributors, L.P., a limited purpose
     broker-dealer, is the Investor's distributor and an NASD member.

   Please confirm that the foregoing correctly sets forth the agreement between
us by signing in the space provided below for that purpose.

                                    DATED AS OF:  March 13, 2000

                                    Delaware Pooled Trust, on behalf of its The
                                    Small-Cap Growth Equity Portfolio

                                    By:    /s/ Gerald S. Frey
                                         --------------------
                                    Print Name:  Gerald S. Frey
                                    Title:  Senior Vice President
                                    Address:  1818 Market Street, Philadelphia
                                    Pennsylvania  19103

AGREED AND ACCEPTED:
CIMA LABS INC.

By:    /s/ John M. Siebert
       -------------------
       John M. Siebert
Title: President and Chief Executive Officer

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