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                                                                    Exhibit 4.12

                                                                     NO. _______

THE SECURITIES UNDERLYING THIS WARRANT HAVE NOT BEEN REGISTERED UNDER THE
SECURITIES ACT OF 1933, AS AMENDED (THE "ACT"), NOR QUALIFIED UNDER THE
SECURITIES LAWS OF ANY STATE, AND MAY NOT BE SOLD, ASSIGNED, TRANSFERRED,
PLEDGED, HYPOTHECATED OR OTHERWISE DISPOSED OF IN THE ABSENCE OF AN EFFECTIVE
REGISTRATION STATEMENT UNDER THE ACT AND QUALIFICATION UNDER APPLICABLE STATE
SECURITIES LAWS, OR AN OPINION OF COUNSEL SATISFACTORY IN FORM AND SUBSTANCE TO
THE COMPANY TO THE EFFECT THAT SUCH REGISTRATION AND QUALIFICATION ARE NOT
REQUIRED.

                     WARRANT TO PURCHASE ________ SHARES OF

                                 COMMON STOCK OF

                               ENDOREX CORPORATION

          (VOID AFTER 5:00 P.M., NEW YORK CITY TIME, NOVEMBER 8, 2008)

         This certifies that __________________ or its duly and validly
registered assigns (the "HOLDER"), for value received, is entitled to purchase
from Endorex Corporation, a Delaware corporation (the "COMPANY"), a maximum of
___________ shares of the Company's Common Stock, par value $.001 per share
("COMMON STOCK") for cash at a price of eight dollars and eleven cents ($8.11)
per share (the "STOCK PURCHASE PRICE"), at any time prior to 5:00 p.m. (New York
City Time) on November 8, 2008 (the "EXPIRATION DATE"), upon surrender to the
Company at its principal office (or at such other location as the Company may
advise the Holder in writing) of this Warrant properly endorsed with the Form of
Subscription attached hereto duly filled in and signed and, if applicable, upon
payment in cash or by check of the aggregate Stock Purchase Price for the number
of shares for which this Warrant is being exercised determined in accordance
with the provisions hereof. The Stock Purchase Price and the number of shares
purchasable hereunder are subject to adjustment as provided in Section 3 of this
Warrant.

         The Warrant is subject to the following terms and conditions:

         1. EXERCISE; ISSUANCE OF CERTIFICATES; PAYMENT FOR SHARES.

                  1.1 GENERAL. This Warrant is exercisable at the option of the
holder of record hereof, at any time or from time to time, up to the Expiration
Date for all or any part of the shares of Common Stock (but not for a fraction
of a share) which may be purchased. The Company agrees that the Common Stock
issued upon exercise of this Warrant shall be and are deemed to be issued to the
Holder hereof as the record owner of such shares as of the close of business on
the date on which this Warrant shall have been surrendered, properly endorsed,
the completed, executed Form of Subscription delivered and payment made for such
shares. Certificates for the shares of Common Stock so purchased, together with
any other securities or

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property to which the Holder hereof is entitled upon such exercise, shall be
delivered to the Holder hereof by the Company at the Company's expense within
a reasonable time after the rights represented by this Warrant have been so
exercised. In case of a purchase of less than all the shares which may be
purchased under this Warrant, the Company shall cancel this Warrant and
execute and deliver a new Warrant or Warrants of like tenor, for the balance
of the shares purchasable under the Warrant surrendered upon such purchase to
the Holder within a reasonable time. Each stock certificate so delivered
shall be in such denominations of Common Stock as may be requested by the
Holder hereof and shall be registered in the name of the Holder.

                  1.2 NET EXERCISE ISSUE.

         Notwithstanding any provisions herein to the contrary, in lieu of
exercising all or part of this Warrant for cash, the Holder may elect to effect
a cashless exercise by surrendering this Warrant at the principal office of the
Company together with the properly endorsed Form of Subscription on which the
Holder has indicated its intent to effect a cashless exercise, attached hereto
and notice of such election in which event the Company shall issue to the Holder
a number of shares of Common Stock computed using the following formula:

                  X = Y (A - B)
                      ---------
                             A

         Where X = the number of shares of Common Stock to be issued to the
Holder;

                                    Y = the number of shares of Common Stock
                                    purchasable under the Warrant or, if only a
                                    portion of the Warrant is being exercised,
                                    the portion of the Warrant being canceled
                                    (at the date of such calculation);

                                    A = the fair market value of one share of
                                    Common  Stock (at the date of such
                                    calculation); and

                                    B = Stock Purchase Price (as adjusted to the
                                    date of such calculation).

         For purposes of the above calculation, fair market value of one share
of Common Stock shall be the average closing price of the Common Stock as
reported on the American Stock Exchange, Nasdaq or any other national securities
exchange for the thirty trading days prior to the date of exercise of this
Warrant; provided, however, that in the event the Common Stock is not listed on
the American Stock Exchange, Nasdaq or any other national securities exchange
the fair market value of one share of Common Stock shall be determined by the
Company's Board of Directors in good faith.

         2. ADJUSTMENT OF STOCK PURCHASE PRICE AND NUMBER OF SHARES. The Stock
Purchase Price and the number of shares purchasable upon the exercise of this
Warrant shall be subject to adjustment from time to time upon the occurrence of
certain events described in this Section 2. Upon each adjustment of the Stock
Purchase Price, the Holder of this Warrant shall thereafter be entitled to
purchase, at the Stock Purchase Price resulting from such adjustment, the

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number of shares obtained by multiplying the Stock Purchase Price in effect
immediately prior to such adjustment by the number of shares purchasable
pursuant hereto immediately prior to such adjustment, and dividing the
product thereof by the Stock Purchase Price resulting from such adjustment.

                  2.1 SUBDIVISION OR COMBINATION OF STOCK. In case the Company
shall at any time subdivide its outstanding shares of Common Stock into a
greater number of shares, the Stock Purchase Price in effect immediately prior
to such subdivision shall be proportionately reduced, and conversely, in case
the outstanding shares of Common Stock of the Company shall be combined into a
smaller number of shares, the Stock Purchase Price in effect immediately prior
to such combination shall be proportionately increased.

                  2.2 REORGANIZATION, RECLASSIFICATION, CONSOLIDATION, MERGER OR
SALE. If any recapitalization, reclassification or reorganization of the capital
stock of the Company, or any consolidation or merger of the Company with another
corporation, or the sale of all or substantially all of its assets or other
transaction shall be effected in such a way that holders of Common Stock shall
be entitled to receive stock, securities, or other assets or property (an
"ORGANIC CHANGE"), then, in connection with such Organic Change, lawful and
adequate provisions shall be made by the Company whereby the Holder hereof shall
thereafter have the right to purchase and receive (in lieu of the shares of the
Common Stock of the Company immediately theretofore purchasable and receivable
upon the exercise of the rights represented hereby) such shares of stock,
securities or other assets or property as may be issued or payable with respect
to or in exchange for a number of outstanding shares of such Common Stock equal
to the number of shares of such stock immediately theretofore purchasable and
receivable upon the exercise of the rights represented hereby; provided,
however, that the at the discretion of the Board of Directors of the Company and
upon providing 15 days prior written notice to the Holder, in the event the
value of the stock, securities or other assets or property (determined in good
faith by the Board of Directors of the Company) issuable or payable with respect
to one share of the Common Stock of the Company immediately theretofore
purchasable and receivable upon the exercise of the rights represented hereby is
in excess of the Stock Purchase Price hereof effective at the time of a merger
and securities received in such reorganization, if any, are publicly traded,
then this Warrant shall expire unless exercised prior to such Organic Change. In
the event of any Organic Change, appropriate provision shall be made by the
Company with respect to the rights and interests of the Holder to the end that
the provisions hereof (including, without limitation, provisions for adjustments
of the Stock Purchase Price to the value for the Common Stock reflected by the
terms of the consolidation, merger or sale and of the number of shares
purchasable and receivable upon the exercise of this Warrant) shall thereafter
be applicable, in relation to any shares of stock, securities or assets
thereafter deliverable upon the exercise hereof.

                  2.3 NOTICES OF CHANGE. Upon any adjustment in the number or
class of shares subject to this Warrant and of the Stock Purchase Price, the
Company shall give, within a reasonable time, written notice thereof to the
Holder.

                  2.4 FULL AND PARTIAL EXERCISES. The adjustments of the Stock
Purchase Price and aggregate numbers of shares of Common Stock issuable upon
exercise of this Warrant shall not apply to any portion of this Warrant that has
been exercised previously or to the shares

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purchased pursuant to such exercise. If any partial exercise(s) of this
Warrant is (or are) made, then the adjustment provisions herein shall be
applied to the portion of the Warrant which remain unexercised when the event
which causes the adjustment occurs.

         3. NO VOTING OR DIVIDEND RIGHTS; LIMITATION OF LIABILITY. Nothing
contained in this Warrant shall be construed as conferring upon the Holder
hereof the right to vote or to consent or to receive notice as a shareholder of
the Company or any other matters or any rights whatsoever as a shareholder of
the Company. No dividends or interest shall be payable or accrued in respect of
this Warrant or the interest represented hereby or the shares purchasable
hereunder until, and only to the extent that, this Warrant shall have been
exercised. No provisions hereof, in the absence of affirmative action by the
Holder to purchase shares of Common Stock, and no mere enumeration herein of the
rights or privileges of the Holder hereof shall give rise to any liability of
the Holder for the Stock Purchase Price or as a shareholder of the Company,
whether such liability is asserted by the Company or by its creditors.

         4. RESTRICTIONS ON TRANSFERS. This Warrant shall not be transferable;
PROVIDED, HOWEVER, that this Warrant and all rights hereunder may be transferred
in whole (i) in the case of a natural person, pursuant to such individual's last
will and testament or the law of intestacy, descent and distribution, or (ii) in
the case of a holder that is not a natural person, to any wholly owned
subsidiary or successor entity of the holder of this Warrant upon surrender of
this Warrant properly endorsed. Such permitted transfer shall be reflected on
the books of the Company maintained for such purpose. Upon any permitted
transfer, the Company shall issue and deliver to the transferee a new warrant or
warrants with respect to the shares of Common Stock issuable upon exercise of
this Warrant so transferred.

         5. REGISTRATION.

         5.1 CERTAIN DEFINED TERMS.

         "1934 Act" shall mean the Securities Exchange Act of 1934, as amended.

         "CTD Warrants" shall mean those warrants of Corporate Technology
Development, Inc. that were exercisable for shares of CTD Series A Convertible
Preferred Stock, par value $.001 per share that were delivered in exchange for
the Merger Warrants.

         "Holders" shall mean the Holder of this Warrant and all other holders
of Merger Warrants.

         "Merger" shall mean the merger of a wholly owned subsidiary of the
Company ("Merger Sub") with and into CTD pursuant to that certain Agreement and
Plan of Merger and Reorganization dated as of ________ __, 2001 by and among the
Company, Merger Sub and CTD.

         "Merger Warrants" shall mean this Warrant and all other like warrants
issued by the Company to the Holders pursuant to the Merger in exchange for CTD
Warrants.

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         "register," "registered," and "registration" shall mean a registration
effected by preparing and filing a registration statement or similar document in
compliance with the Act, and the declaration or ordering of effectiveness of
such registration statement or document.

         "Registrable Securities" shall mean the shares of Common Stock issued
or issuable to the Holder upon exercise of this Warrant.

         "SEC" shall mean the Securities and Exchange Commission.

                  5.2 COMPANY REGISTRATION. If (but without any obligation to do
so) the Company proposes to register any shares of Common Stock under the
Securities Act (other than a registration on Forms S-3, S-4 or S-8, or any
successor forms or other forms promulgated for similar purposes) for its own
account or for the account of other holders of Common Stock and the registration
form to be utilized allows inclusion of Registrable Securities, the Company
shall, at such time, give the Holder at least fifteen (15) days prior written
notice of such registration (the "COMPANY REGISTRATION"). If the Company
receives from the Holder within fifteen (15) days after the mailing of such
notice a written request by the Holder for inclusion of Registrable Securities
held by the Holder on the Company Registration, the Company shall, subject to
the provisions of Section 5.6, cause to be registered on the Company
Registration all of the Registrable Securities that the Holder has requested to
be so registered

                  5.3 FURNISH INFORMATION. It shall be a condition precedent to
the obligations of the Company to take any action pursuant to this Section 5
that the Holder shall furnish to the Company in writing such information
regarding itself, the Registrable Securities held by the Holder, and the
intended method of disposition of the Registrable Securities as shall be
requested by the Company in order to effect the registration of the Registrable
Securities.

                  5.4 EXPENSES OF REGISTRATION. All reasonable expenses incurred
in connection with registrations, filings or qualifications pursuant to this
Section 5, including all registration, filing and qualification fees, printers'
and accounting fees, and fees and disbursements of counsel for the Company shall
be borne by the Company; provided, however, that the Holder shall be responsible
for its pro rata share of the underwriting discounts and commissions, fees and
expenses related to accounting services for the Holder and fees and expenses of
legal counsel for the Holder.

                  5.5 UNDERWRITING REQUIREMENTS. If the Company Registration is
in connection with an offering involving an underwriting of shares of Common
Stock, the Company shall not be required to include on the Company Registration
the Registrable Securities unless the Holder accepts, in writing, the terms of
the underwriting as agreed upon between the Company and the underwriters
selected by the Company (or by other persons entitled to select the
underwriters), and then only in such quantity as the underwriters determine in
their sole discretion will not jeopardize the success of the offering by the
Company. The number of shares of Registrable Securities that may be included in
the underwriting shall be reduced to a number deemed advisable by the
underwriters, provided that the securities to be offered by the Company or any
other holder of securities of the Company (the "SELLING STOCKHOLDER") shall have
priority over any Registrable Securities.

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                  5.6 DELAY OF REGISTRATION.

                  (a) The Holder shall not have any right to obtain or seek an
injunction restraining or otherwise delaying any such registration as the result
of any controversy that might arise with respect to the interpretation or
implementation of this Section 5.

                  (b) Notwithstanding any other provision in this Section 5, the
Company may, at any time, abandon or delay any Company Registration.

                  5.7 INDEMNIFICATION. In the event any Registrable Securities
are included in a Company Registration:

                  (a) To the extent permitted by law, the Company will
indemnify and hold harmless the Holder and each person, if any, who controls
the Holder within the meaning of the Act or the 1934 Act, against any losses,
claims, damages, or liabilities (joint or several) to which they may become
subject under the Act, the 1934 Act or other federal or state securities law,
insofar as such losses, claims, damages, or liabilities (or actions in
respect thereof) arise out of or are based upon any of the following
statements, omissions or violations (collectively, a "VIOLATION"): (i) any
untrue statement or alleged untrue statement of a material fact contained in
such Company Registration, including any preliminary prospectus or final
prospectus contained therein or any amendments or supplements thereto, (ii)
the omission or alleged omission to state therein a material fact required to
be stated therein, or necessary to make the statements therein not
misleading, or (iii) any violation or alleged violation by the Company of the
Act, the 1934 Act, any state securities law or any rule or regulation
promulgated under the Act, the 1934 Act or any state securities law, and the
Company will pay to the Holder or controlling person, as incurred, any legal
or other expenses reasonably incurred by them in connection with
investigating or defending any such loss, claim, damage, liability, or
action; provided, however, that the indemnity agreement contained in this
Section 5.7(a) shall not apply to amounts paid in settlement of any such
loss, claim, damage, liability, or action if such settlement is effected
without the consent of the Company (which consent shall not be unreasonably
withheld), nor shall the Company be liable in any such case for any such
loss, claim, damage, liability, or action to the extent that it arises out of
or is based upon a Violation which occurs in reliance upon and in conformity
with information furnished for use in connection with such registration by
the Holder, underwriter or controlling person.

                  (b) To the extent permitted by law, the Holder will indemnify
and hold harmless the Company, each of its officers and directors, each person,
if any, who controls the Company within the meaning of the Act, any underwriter,
any Selling Stockholder under such Company Registration and any controlling
person of any such underwriter or Selling Stockholder, against any losses,
claims, damages, or liabilities (joint or several) to which any of the foregoing
persons may become subject, under the Act, the 1934 Act or other federal or
state securities law, insofar as such losses, claims, damages, or liabilities
(or actions in respect thereto) arise out of or are based upon any Violation, in
each case to the extent (and only to the extent) that such Violation occurs in
reliance upon and in conformity with information furnished by the Holder for use
in connection with such registration; and the Holder will pay, as incurred, any
legal or other expenses reasonably incurred by any person intended to be
indemnified pursuant to this Section 5.7(b), in connection with investigating or
defending any such loss, claim, damage,

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liability, or action; provided, however, that the indemnity agreement
contained in this Section 5.7(b) shall not apply to amounts paid in
settlement of any such loss, claim, damage, liability or action if such
settlement is effected without the consent of the Holder, which consent shall
not be unreasonably withheld; provided, further, that, in no event shall any
indemnity under this Section 5.7(b) exceed the gross proceeds from the
offering received by the Holder.

                  (c) Promptly after receipt by an indemnified party under this
Section 5.7 of notice of the commencement of any action (including any
governmental action), such indemnified party will, if a claim in respect thereof
is to be made against any indemnifying party under this Section 5.7, deliver to
the indemnifying party a written notice of the commencement thereof and the
indemnifying party shall have the right to participate in, and, to the extent
the indemnifying party so desires, jointly with any other indemnifying party
similarly noticed, to assume the defense thereof with counsel mutually
satisfactory to the parties; provided, however, that an indemnified party
(together with all other indemnified parties which may be represented without
conflict by one counsel) shall have the right to retain one separate counsel,
with the fees and expenses to be paid by the indemnifying party, if
representation of such indemnified party by the counsel retained by the
indemnifying party would be inappropriate due to actual or potential differing
interests between such indemnified party and any other party represented by such
counsel in such proceeding as set forth in a legal opinion of counsel reasonably
satisfactory to the indemnifying party. The failure to deliver written notice to
the indemnifying party within a reasonable time of the commencement of any such
action, if materially prejudicial to its ability to defend such action, shall
relieve such indemnifying party of any liability to the indemnified party under
this Section 5.7 to the extent that such failure to deliver notice was the cause
of any damages or other obligations of indemnification, but the omission so to
deliver written notice to the indemnifying party will not relieve it of any
liability that it may have to any indemnified party otherwise than under this
Section 5.7.

                  (d) If the indemnification provided for in this Section 5.7 is
held by a court of competent jurisdiction to be unavailable to an indemnified
party with respect to any loss, liability, claim, damage, or expense referred to
therein, then the indemnifying party, in lieu of indemnifying such indemnified
party hereunder, shall contribute to the amount paid or payable by such
indemnified party as a result of such loss, liability, claim, damage, or expense
in such proportion as is appropriate to reflect the relative fault of the
indemnifying party on the one hand and of the indemnified party on the other in
connection with the statements or omissions that resulted in such loss,
liability, claim, damage, or expense as well as any other relevant equitable
considerations. The relative fault of the indemnifying party and of the
indemnified party shall be determined by reference to, among other things,
whether the untrue or alleged untrue statement of a material fact or the
omission to state a material fact relates to information supplied by the
indemnifying party or by the indemnified party and the parties' relative intent,
knowledge, access to information, and opportunity to correct or prevent such
statement or omission.

                  (e) Notwithstanding the foregoing, to the extent that the
provisions on indemnification and contribution contained in the underwriting
agreement entered into in connection with the underwritten public offering are
in conflict with the foregoing provisions, the provisions in the underwriting
agreement shall control.

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                  (f) The obligations of the Company and the Holder under this
Section 5.7 shall survive the completion of any offering of Registrable
Securities under a Company Registration, and otherwise.

                  5.8 ASSIGNMENT OF REGISTRATION RIGHTS. The rights to cause the
Company to register Registrable Securities pursuant to this Section 5 may be
only be assigned with a permitted assignment pursuant to Section 4.

                  5.9 "MARKET STAND-OFF" AGREEMENT. The Holder hereby agrees
that, during the period of duration specified by the Company and an underwriter
of Common Stock or other securities of the Company, if any, it shall not, to the
extent requested by the Company, and such underwriter, directly or indirectly
sell, offer to sell, contract to sell (including, without limitation, any short
sale), grant any option to purchase or otherwise transfer or dispose of (other
than to donees who agree to be similarly bound) any securities of the Company
held by it at any time during such period except Registrable Securities included
in such registration; provided, however, that such market stand-off time period
shall not exceed ninety (90) days in any 360-day period. In order to enforce the
foregoing covenant, the Company may impose stop-transfer instructions with
respect to the Registrable Securities held by the Holder until the end of such
period.

                  5.10 TERMINATION OF REGISTRATION RIGHTS. Notwithstanding
anything to the contrary set forth herein, the covenants set forth in Section 5
and the Company's obligations under Section 5.2 shall terminate upon the seventh
anniversary of ________ __, 2001 or upon the date that all shares of Registrable
Securities have been sold in their entirety by the Holder or may immediately be
sold by the Holder under Rule 144(k) during any 90-day period.

                  5.11 OBLIGATIONS OF THE COMPANY. Whenever required under this
Section 5 to effect the registration of any Registrable Securities on a Company
Registration, the Company shall use reasonable best efforts to:

                  (a) prepare and file with the SEC such amendments and
supplements to such registration statement and the prospectus used in connection
with such registration statement as may be necessary to comply with the
provisions of the Securities Act with respect to the disposition of all
securities covered by such registration statement;

                  (b) furnish to the Holder such numbers of copies of a
prospectus, including a preliminary prospectus, in conformity with the
requirements of the Securities Act, and such other documents as the Holder may
reasonably request in order to facilitate the disposition of Registrable
Securities owned by the Holder; and

                  (c) register and qualify the securities covered by such
Company Registration under such other securities or Blue Sky laws of such
jurisdictions as shall be reasonably requested by the Holder; provided that the
Company shall not be required in connection therewith or as a condition thereto
to qualify to do business or to file a general consent to service of process in
any such states or jurisdictions.

         6. MODIFICATION AND WAIVER. This Warrant and any provision hereof may
be changed, waived, discharged or terminated only by an instrument in writing
signed by the party

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against which enforcement of the same is sought or by the written consent of
the Holders of the majority of the shares of Common Stock issuable upon
exercise of the Merger Warrants then outstanding.

         7. NOTICES. All notices, requests, documents and other communications
hereunder shall be in writing and shall be deemed given on the day delivered if
delivered personally, the next business day if delivered by commercial delivery
service or by reputable overnight courier, and the third business day if mailed
by registered or certified mail (return receipt requested) to the parties at the
following address (or such other address as either may from time to time provide
to the other in writing): (i) to the Holder at its address as shown on the books
of the Company and (ii) to the Company at 28101 Ballard Drive, Suite F, Lake
Forest, Illinois 60045, Attention: Chief Executive Officer.

         8. BINDING EFFECT ON SUCCESSORS. This Warrant shall be binding upon any
corporation or other entity succeeding the Company by merger, consolidation or
acquisition of all or substantially all of the Company's assets.

         9. LEGEND. The Common Stock issuable upon exercise of this Warrant
shall bear the following legend:

                  "THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN
                  REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE
                  "ACT"), NOR QUALIFIED UNDER THE SECURITIES LAWS OF ANY STATE,
                  AND MAY NOT BE SOLD, ASSIGNED, TRANSFERRED, PLEDGED,
                  HYPOTHECATED OR OTHERWISE DISPOSED OF IN THE ABSENCE OF AN
                  EFFECTIVE REGISTRATION STATEMENT UNDER THE ACT AND
                  QUALIFICATION UNDER APPLICABLE STATE SECURITIES LAWS, OR AN
                  OPINION OF COUNSEL SATISFACTORY IN FORM AND SUBSTANCE TO THE
                  COMPANY TO THE EFFECT THAT SUCH REGISTRATION AND QUALIFICATION
                  ARE NOT REQUIRED."

         10. DESCRIPTIVE HEADINGS AND GOVERNING LAW. The description headings of
the several sections and paragraphs of this Warrant are inserted for convenience
only and do not constitute a part of this Warrant. This Warrant shall be
construed and enforced in accordance with, and the rights of the parties shall
be governed by, the laws of the State of Delaware.

         11. LOST WARRANTS. Upon receipt of evidence satisfactory to the Company
of the loss, theft, destruction, or mutilation of this Warrant and, in the case
of any such loss, theft or destruction, upon receipt of an indemnity
satisfactory to the Company, or in the case of any such mutilation upon
surrender and cancellation of such Warrant, the Company, at its expense, will
make and deliver a new Warrant, of like tenor in lieu of the lost, stolen,
destroyed or mutilated Warrant.

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         12. FRACTIONAL SHARES. No fractional shares shall be issued upon
exercise of this Warrant. The number of shares that shall be issued upon
exercise of this Warrant shall be rounded down to the nearest whole share.

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         IN WITNESS WHEREOF, the Company has caused this Warrant to be duly
executed by its officers, thereunto duly authorized this ____ day of __________,
2001.

                                           ENDOREX CORPORATION

                                           By:  ________________________________
                                                  Name:
                                                  Title:

ATTEST:

________________________________
Secretary

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                                    EXHIBIT A

                                SUBSCRIPTION FORM

                                                            Date: ______________

Endorex Corporation
28101 Ballard Drive, Suite F
Lake Forest, Illinois  60045
Attn:  Chief Executive Officer

Ladies and Gentlemen:

A.       The undersigned hereby elects to irrevocably exercise the Warrant No.
         _________ (the "WARRANT") issued to it by Endorex Corporation (the
         "COMPANY") on ________ ___, 2001 and to purchase thereunder ________
         shares of Common Stock of the Company, par value $.001 per share (the
         "SHARES") at a purchase price of _____________ ($____) per Share, or
         other such purchase price as mandated by Section 3 of the Warrant, for
         an aggregate purchase price of _____________ Dollars ($________) the
         ("PURCHASE PRICE").

B.       The undersigned hereby elects to irrevocably convert
         ___________________ percent (___ %) of the value of the Warrant
         pursuant to the provisions of Section 1.2 of the Warrant.

         Pursuant to the terms of the Warrant the undersigned has delivered or
is delivering herewith to the Company the original executed Warrant and, if the
Warrant is being exercised pursuant to paragraph A above, the Stock Purchase
Price (as defined in the Warrant) in full in cash or by certified check or wire
transfer for any such exercise.

                                     Very truly yours.

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

                                     By:
                                         --------------------------------------

                                     Title:
                                            -----------------------------------<Page>

                                                                 Exhibit 10.28

                           FORM OF AFFILIATE AGREEMENT

Endorex Corporation
28101 Ballard Drive, Suite F
Lake Forest, Illinois  60045

Attention:  Michael S. Rosen,
            Chief Executive Officer

Ladies and Gentlemen:

         The undersigned is director or officer and/or a holder of capital
stock, options, warrants or other rights to acquire capital stock (collectively,
the "Company Securities") of Corporate Technology Development, Inc., a Delaware
corporation ("Company"). Pursuant to that certain Agreement and Plan of Merger
and Reorganization (the "Merger Agreement") dated ______ __, 2001 by and among
Company, Endorex Corporation, a Delaware corporation ("Parent"), and Roadrunner
Acquisition, Inc., a Delaware corporation ("Merger Sub"), Merger Sub will merge
with and into Company (the "Merger"). The undersigned may be entitled to receive
in connection with the Merger shares of common stock, par value $0.001 per
share, of Parent ("Parent Common Stock") in exchange for the Company Securities
held by the undersigned.

         The undersigned acknowledges that the undersigned may be deemed an
"affiliate" of Company within the meaning of (i) Rule 145 ("Rule 145")
promulgated by the Securities and Exchange Commission (the "SEC") under the
Securities Act of 1933, as amended (the "Act"); and/or (ii) Accounting Series
Releases 130 and 135, as amended, of the SEC, although nothing contained herein
should be construed as an admission of such fact.

         If in fact the undersigned is an affiliate under the Act, the
undersigned's ability to sell, assign or transfer the shares of Parent Common
Stock received by the undersigned in connection with the Merger may be
restricted unless such transaction is registered under the Act or an exemption
from such registration is available. The undersigned understands that such
exemptions are limited and the undersigned has obtained advice of counsel as to
the nature and conditions of such exemptions, including information with respect
to the applicability to the sale of such securities of Rules 144 and 145(d)
promulgated by the SEC under the Act. Other than as provided in the Merger
Agreement, the undersigned understands that Parent is under no obligation to
register the sale, transfer or other disposition of shares of Parent Common
Stock by the undersigned under the Act or to take any action to make compliance
with an exemption from such registration available.

         (a) The undersigned hereby agrees that the undersigned will not sell,
assign or transfer any of the shares of Parent Common Stock received by the
undersigned in connection with the Merger except (i) pursuant to an effective
registration statement under the Act or (ii) in a transaction which, in the
opinion of independent counsel reasonably satisfactory to Parent (the reasonable
fees of which counsel shall be paid by the undersigned) or as described in a
"no-action" or interpretive letter from the Staff of the SEC, is not required to
be registered under the Act.

<Page>

         (b) The undersigned further agrees that the undersigned will not sell,
transfer, contract to sell, pledge, grant any option to purchase, make any short
sale, or otherwise dispose of or reduce the undersigned's risk with respect to
any shares of capital stock of Parent or options, warrants or other rights to
acquire shares of capital stock of Parent (collectively, the "Parent
Securities") held by the undersigned until the date upon which Parent shall have
filed two reports on either Form 10-KSB or 10-QSB with the SEC for any two
reporting periods ended subsequent to the Effective Time (as defined in the
Merger Agreement).

         (c) In the event of a sale or other disposition by the undersigned of
shares of Parent Common Stock pursuant to Rule 145, the undersigned will supply
Parent with evidence of compliance with Rule 145, in the form of a broker's
letter in customary form or other evidence reasonably satisfactory to Parent.
The undersigned understands that Parent may instruct its transfer agent to
withhold the transfer of any shares of Parent Common Stock disposed of by the
undersigned, but that, subject to Paragraph (b) above, upon receipt of such
evidence of compliance the transfer agent shall effectuate the transfer of the
shares of Parent Common Stock sold as indicated in such evidence.

         (d) The undersigned acknowledges and agrees that the legends set forth
in paragraphs (e) and (f) below will be placed on certificates representing the
shares of Parent Common Stock received by the undersigned in connection with the
Merger or held by a transferee thereof, which legends will be removed by
delivery of substitute certificates upon receipt of an opinion in form and
substance reasonably satisfactory to Parent from independent counsel reasonably
satisfactory to Parent (the reasonable fees of which counsel shall be paid by
the undersigned) to the effect that such legends are no longer required for
purposes of the Act or applicable rules and regulations promulgated by the SEC.

         (e) There will be placed on the certificates for the shares of Parent
Common Stock issued to the undersigned, or any substitutions therefor, a legend
stating in substance:

                  "The shares represented by this certificate were issued in a
         transaction to which Rule 145 promulgated under the Securities Act of
         1933 applies. The shares represented by this certificate may only be
         transferred in accordance with the terms of an agreement dated
         __________ __, 2001 between the registered holder hereof and Parent, a
         copy of which agreement is on file at the principal offices of Parent."

         (f) The undersigned also understands that unless a sale or transfer by
the undersigned of shares of Parent Common Stock has been registered under the
Act or is a sale made in conformity with the provisions of Rule 145 and the
terms hereof, Parent reserves the right to put the following legend on the
certificates issued to any transferee of the undersigned:

                  "The shares represented by this certificate have not been
         registered under the Securities Act of 1933 and were acquired from a
         person who received such shares in a transaction to which Rule 145
         promulgated under the Securities Act of 1933 applies. The shares have
         been acquired by the holder not with a view to, or for resale in
         connection with, any distribution thereof within the meaning of the
         Securities Act of 1933 and may not be sold, pledged or otherwise
         transferred except in accordance with an exemption from the
         registration requirements of the Securities Act of 1933."

         (g) The undersigned acknowledges that (i) the undersigned has carefully
read this Agreement and understands the requirements hereof and the limitations
imposed upon the distribution, sale, transfer or other disposition of shares of
Parent Securities and Company Securities; and (ii) the receipt by Parent of this
Agreement is an inducement and a condition to Parent's obligations to consummate
the Merger.

<Page>

                                               Very truly yours,

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

                                               By:
                                                    ---------------------------

                                                    Name:
                                                           --------------------

                                                    Title:
                                                           --------------------

Accepted this ___ day of __________, 2001 by:

Endorex Corporation.

By:
         ----------------------------------

         Name:
                ---------------------------

         Title:
                ---------------------------

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