Document:

Exhibit 4.1

                            SPECIMEN UNIT CERTIFICATE

     NUMBER                                                                UNITS
U-___________

SEE REVERSE FOR
   CERTAIN
 DEFINITIONS

                      PHARMAMATRIX ACQUISITION CORPORATION

                                                                           CUSIP

         UNITS CONSISTING OF ONE SHARE OF COMMON STOCK AND TWO WARRANTS
                   EACH TO PURCHASE ONE SHARE OF COMMON STOCK

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

THIS CERTIFIES
THAT
-------------------- -----------------------------------------------------------
is the owner
of                                                                        Units.
-------------------- -----------------------------------------------------------

Each Unit ("Unit") consists of one (1) share of common stock, par value $.0001
per share ("Common Stock"), of Pharmamatrix Acquisition Corporation, a Delaware
corporation (the "Company"), and two warrants (the "Warrants"). Each Warrant
entitles the holder to purchase one (1) share of Common Stock for $5.00 per
share (subject to adjustment). Each Warrant will become exercisable on the later
of (i) the Company's completion of a merger, capital stock exchange, asset
acquisition or other similar business combination or (ii) ______________, 2006
and will expire unless exercised before 5:00 p.m., New York City Time, on
____________, 2009, or earlier upon redemption (the "Expiration Date"). The
Common Stock and Warrants comprising the Units represented by this certificate
are not transferable separately prior to __________, 2005, subject to earlier
separation in the discretion of Jesup & Lamont Securities Corporation. The terms
of the Warrants are governed by a Warrant Agreement, dated as of _______, 2005,
between the Company and Continental Stock Transfer & Trust Company, as Warrant
Agent, and are subject to the terms and provisions contained therein, all of
which terms and provisions the holder of this certificate consents to by
acceptance hereof. Copies of the Warrant Agreement are on file at the office of
the Warrant Agent at 17 Battery Place, New York, New York 10004, and are
available to any Warrant holder on written request and without cost. This
certificate is not valid unless countersigned by the Transfer Agent and
Registrar of the Company.

Witness the facsimile seal of the Company and the facsimile signature of its
duly authorized officers.

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

By
-------- --------------------------------------------- -------------------------

-------- --------------------------------------------- -------------------------
                       Chairman of the Board           Secretary
-------- --------------------------------------------- -------------------------

<PAGE>

                      PHARMAMATRIX ACQUISITION CORPORATION
                                    CORPORATE
                                      SEAL
                                      2005
                                    DELAWARE

                      PHARMAMATRIX ACQUISITION CORPORATION

         The Company will furnish without charge to each stockholder who so
requests, a statement of the powers, designations, preferences and relative,
participating, optional or other special rights of each class of stock or series
thereof of the Company and the qualifications, limitations, or restrictions of
such preferences and/or rights.

         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)
--------------------------------------------------------------------------------

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

--------------------------------------------------------------------------------
                                                                           Units
--------------------------------------------------------------------------
represented by the within Certificate, and do hereby irrevocably constitute and
appoint

                                       2
<PAGE>

_______________________________________________________________________ Attorney

to transfer the said Units on the books of the within named Company will 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.

                                       3
<PAGE>

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).

                                       4Exhibit 4.2

                       SPECIMEN COMMON STOCK CERTIFICATE

NUMBER                                                                    SHARES
_________C

                      PHARMAMATRIX ACQUISITION CORPORATION

              INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE

                                  COMMON STOCK

                                                                 SEE REVERSE FOR
                                                             CERTAIN DEFINITIONS

THIS CERTIFIES THAT                                          CUSIP

IS THE OWNER OF

            FULLY PAID AND NON-ASSESSABLE SHARES OF THE PAR VALUE OF
                       $.0001 EACH OF THE COMMON STOCK OF

                      PHARMAMATRIX ACQUISITION CORPORATION

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

    Dated:

--------------------------------------    --------------------------------------
CHAIRMAN                                  SECRETARY

                      PHARMAMATRIX ACQUISITION CORPORATION
                                    CORPORATE
                                    SEAL 2005
                                    DELAWARE

         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

<PAGE>

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.

                      PHARMAMATRIX ACQUISITION CORPORATION

         The Corporation will furnish without charge to each stockholder who so
requests the powers, designations, preferences and relative, participating,
optional or other special rights of each class of stock or series thereof of the
Corporation and the qualifications, limitations, or restrictions of such
preferences and/or rights. This certificate and the shares represented thereby
are issued and shall be held subject to all the provisions of the Certificate of
Incorporation and all amendments thereto and resolutions of the Board of
Directors providing for the issue of shares of Preferred Stock (copies of which
may be obtained from the secretary of the Corporation), to all of which the
holder of this certificate by acceptance hereof assents.

         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 will
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.

                                       2
<PAGE>

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).

The holder of this certificate shall be entitled to receive funds from the trust
fund only in the event of the Company's liquidation or if the holder seeks to
convert his respective shares into cash upon a business combination which he
voted against and which is actually completed by the Company. In no other
circumstances shall the holder have any right or interest of any kind in or to
the trust fund.

                                       3

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