<PAGE>
                                                                    Exhibit 4.10

      NUMBER                                                       SHARES
IDD _____________                                               _____________

                     INNOVATIVE DRUG DELIVERY SYSTEMS, INC.

INCORPORATED UNDER THE LAWS                                  SEE REVERSE SIDE
 OF THE STATE OF DELAWARE                                   CERTAIN DEFINITIONS

THIS IS TO CERTIFY THAT                                        CUSIP 45771B 10 7




is the owner of

FULLY PAID AND NON-ASSESSABLE SHARES OF THE COMMON STOCK OF THE PAR VALUE OF
$.001 PER SHARE OF

                     INNOVATIVE DRUG DELIVERY SYSTEMS, INC.

transferable upon the books of the Corporation by the holder hereof in person or
by duly authorized attorney upon surrender of this Certificate properly
endorsed. This Certificate is not valid unless countersigned and registered by
the Transfer Agent and Registrar.
     Witness the facsimile seal of the Corporation and the facsimile signatures
of its duly authorized officers.

Dated:

/s/ Fred Mermelstein                                    /s/ Leonard Firestone
-----------------------------                           ------------------------
SECRETARY                                               CHIEF EXECUTIVE OFFICER

                     --------------------------------------
                     INNOVATIVE DRUG DELIVERY SYSTEMS, INC.
                                 CORPORATE SEAL
                                      1999
                                    DELAWARE
                     --------------------------------------

COUNTERSIGNED AND REGISTERED:
     AMERICAN STOCK TRANSFER & TRUST COMPANY
              (NEW YORK)
                              TRANSER AGENT
                              AND REGISTRAR
BY

                       AUTHORIZED SIGNATURE

<PAGE>
         The Corporation will furnish without charge to each stockholder who so
requests a statement of the designations, relative rights, preferences, and
limitations applicable to each class of shares and the variations in rights,
preferences, and limitations determined for each series thereof (and the
authority of the Board of Directors to determine variations for future series).
Such request may be addressed to the Secretary of the Corporation or to the
Transfer Agent and Registrar named on the face of the Certificate.


         The following abbreviations, when used in the inscription on the face
of this certificate, shall be construed as though they were written out in full
according to applicable laws or regulations:

TEN COM - as tenants in common
TEN ENT - as tenants by the entireties
JT TEN  - as joint tenants with right of
          survivorship and not as tenants
          in common

UNIF GIFT MIN ACT- __________ Custodian _____________
                    (Cust)                 (Minor)

                    under Uniform Gifts to Minors
                    Act __________________
                             (State)

Additional abbreviations may also be used though not in the above list.

For value received, __________________________ hereby sell, assign and transfer
unto

PLEASE INSERT SOCIAL SECURITY OR OTHER
   IDENTIFYING NUMBER OF ASSIGNEE

--------------------------------------
|                                    |
--------------------------------------

--------------------------------------------------------------------------------
  (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE)

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------

------------------------------------------------------------------------ shares

of the capital stock represented by the within Certificate and do hereby
irrevocably constitute and appoint

----------------------------------------------------------------------- Attorney
to transfer the said stock on the books of the within named Corporation with
full power of substitution in the premises.

Dated:_______________________


                 _______________________________________________________________
                 NOTICE:  THE SIGNATURE TO THIS ASSIGNMENT MUST CORRESPOND WITH
                          THE NAME AS WRITTEN UPON THE FACE OF THE CERTIFICATE
                          IN EVERY PARTICULAR, WITHOUT ALTERATION OR
                          ENLARGEMENT OR ANY CHANGE WHATEVER.


Signature(s) Guaranteed:

_______________________________________________________________
THE SIGNATURE(S) SHOULD BE GUARANTEED BY AN ELIGIBLE GUARANTOR
INSTITUTION (BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS
AND CREDIT UNIONS WITH MEMBERSHIP IN AN APPROVED SIGNATURE
GUARANTEE MEDALLION PROGRAM), PURSUANT TO S.E.C. RULE 17Ad-15.