Document:

REGISTRATION RIGHTS AGREEMENT

     This REGISTRATION RIGHTS AGREEMENT (this "Agreement"), dated as of May 17,
2000, is entered into by and among Generex Biotechnology Corporation, a Delaware
corporation, with headquarters located at 33 Harbour Square, Suite 202, Toronto,
Canada M5J 2G2 (the "Company"), and the undersigned buyers (each, a "Buyer" and
collectively, the "Buyers").

     WHEREAS:

     A. In connection with the Securities Purchase Agreement by and among the
parties dated as of May 17, 2000 (the "Securities Purchase Agreement"), the
Company has agreed, upon the terms and subject to the conditions of the
Securities Purchase Agreement, (i) to issue and sell to the Buyers that number
of shares of the Company's Common Stock, par value $.001 per share as set forth
in Section 1 of the Securities Purchase Agreement (the "Common Shares") and (ii)
to issue Warrants (the "Warrants") which will be exercisable to purchase that
number of shares of Common Stock as set forth in Section 1 of the Securities
Purchase Agreement (the "Warrant Shares"); and

     B. To induce the Buyers to execute and deliver the Securities Purchase
Agreement, the Company has agreed to provide certain registration rights under
the Securities Act of 1933, as amended, and the rules and regulations
thereunder, or any similar successor statute (collectively, the "1933 Act"), and
applicable state securities laws.

     NOW, THEREFORE, in consideration of the premises and the mutual covenants
contained herein and other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the Company and the Buyers hereby
agree as follows:

     1. DEFINITIONS.

     As used in this Agreement, the following terms shall have the following
meanings:

     a. "Investor" means a Buyer, any transferee or assignee thereof to whom a
Buyer assigns its rights under this Agreement and who agrees to become bound by
the provisions of this Agreement in accordance with Section 9 and any transferee
or assignee thereof to whom a transferee or assignee assigns its rights under
this Agreement and who agrees to become bound by the provisions of this
Agreement in accordance with Section 9.

     b. "Person" means a corporation, a limited liability company, an
association, a partnership, an organization, a business, an individual, a
governmental or political subdivision thereof or a governmental agency.

     c. "Register," "registered," and "registration" refer to a registration
effected by preparing and filing one or more Registration Statements (as defined
below) in compliance with the 1933 Act and pursuant to Rule 415 under the 1933
Act or any successor rule providing for offering securities on a continuous
basis ("Rule 415"), and the declaration or ordering of

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effectiveness of such Registration Statement(s) by the United States Securities
and Exchange Commission (the "SEC").

     d. "Registrable Securities" means the Common Shares purchased pursuant to
the Securities Purchase Agreement and the Warrant Shares issued or issuable upon
exercise of the Warrants and any shares of capital stock issued or issuable with
respect to the Common Shares, Warrants or Warrant Shares as a result of any
stock split, stock dividend, recapitalization, exchange, anti-dilution rights or
similar event or otherwise, without regard to any limitation on exercise of the
Warrants.

     e. "Registration Statement" means a registration statement of the Company
filed under the 1933 Act and pursuant to Rule 415.

Capitalized terms used herein and not otherwise defined herein shall have the
respective meanings set forth in the Securities Purchase Agreement.

     2. REGISTRATION.

     a. Mandatory Registration. The Company shall prepare, and, as soon as
practicable but in no event later than sixty (60) calendar days after the date
hereof, file with the SEC a Registration Statement or Registration Statements
(as is necessary) on Form S-3 (or if such form is unavailable, such other form
as is available for registration) covering the resale of all of the Registrable
Securities. The initial Registration Statement prepared pursuant hereto shall
register for resale at least that number of Company common stock shares equal to
the number of Registrable Securities as of the date immediately preceding the
date the Registration Statement is initially filed with the SEC, subject to
adjustment as provided in Section 3(b). The Company shall use its best efforts
to have the Registration Statement declared effective by the SEC as soon as
practicable, but in no event later than one-hundred twenty (120) calendar days
after the date hereof.

     b. Piggy-Back Registrations. If at any time prior to the expiration of the
Registration Period (as defined in Section 3(a)) that the Registrable Securities
are not already covered by an effective Registration Statement the Company
proposes to file with the SEC a Registration Statement relating to an offering
for its own account or the account of others under the 1933 Act of any of its
securities (other than on Form S-4 or Form S-8 (or their equivalents at such
time) relating to securities to be issued solely in connection with any
acquisition of any entity or business or equity securities issuable in
connection with stock option or other employee benefit plans) the Company shall
promptly send to each Investor written notice of the Company's intention to file
a Registration Statement and of such Investor's rights under this Section 2(b)
and, if within twenty (20) days after receipt of such notice, such Investor
shall so request in writing, the Company shall include in such Registration
Statement all or any part of the Registrable Securities such Investor requests
to be registered, subject to the priorities set forth in Section 2(b) below. No
right to registration of Registrable Securities under this Section 2(b) shall be
construed to limit any registration required under Section 2(a). The obligations
of the Company under this Section 2(b) may be waived by the Investors. If an
offering in connection with which an Investor is entitled to registration under
this Section 2(b) is an underwritten offering, then each Investor whose
Registrable Securities are included in such Registration Statement shall, unless
otherwise agreed by the

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Company, offer and sell such Registrable Securities in an underwritten offering
using the same underwriter or underwriters and, subject to the provisions of
this Agreement, on the same terms and conditions as other shares of Company
common stock included in such underwritten offering. If a registration pursuant
to this Section 2(b) is to be an underwritten public offering and the managing
underwriter(s) advise the Company in writing, that in their reasonable good
faith opinion, marketing or other factors dictate that a limitation on the
number of shares of Company common stock which may be included in the
Registration Statement is necessary to facilitate and not adversely affect the
proposed offering, then the Company shall include in such registration: (1)
first, all securities the Company proposes to sell for its own account, (2)
second, up to the full number of securities proposed to be registered for the
account of the holders of securities entitled to inclusion of their securities
in the Registration Statement by reason of demand registration rights, and (3)
third, the securities requested to be registered by the Investors and other
holders of securities entitled to participate in the registration, as of the
date hereof, drawn from them pro rata based on the number each has requested to
be included in such registration.

     c. Allocation of Registrable Securities. The initial number of Registrable
Securities included in any Registration Statement and each increase in the
number of Registrable Securities included therein shall be allocated pro rata
among the Investors based on the number of Registrable Securities held, or which
could be held, by each Investor at the time the Registration Statement covering
such initial number of Registrable Securities or increase thereof is declared
effective by the SEC. In the event that an Investor sells or otherwise transfers
any of such Person's Registrable Securities, each transferee shall be allocated
a pro rata portion of the then remaining number of Registrable Securities
included in such Registration Statement for such transferor. Any Common Shares
included in a Registration Statement and which remain allocated to any Person
which ceases to hold any Registrable Securities shall be allocated to the
remaining Investors, pro rata based on the number of Registrable Securities then
held by such Investors.

     d. Legal Counsel. Subject to Section 5 hereof, the Investors shall have the
right to select one legal counsel to review and oversee at their expense any
offering pursuant to this Section 2 ("Legal Counsel"), which shall be Strategic
Investment Counsel, LLC or such other counsel as thereafter designated by the
holders of a majority of Registrable Securities. The Company shall reasonably
cooperate with Legal Counsel in performing the Company's obligations under this
Agreement.

     e. [Reserved.]

     f. Rule 416. The Company and the Investors each acknowledge that each
Registration Statement prepared in accordance hereunder shall include an
indeterminate number of Registrable Securities pursuant to Rule 416 under the
1933 Act so as to cover any and all Registrable Securities which may become
issuable (i) to prevent dilution resulting from stock splits, stock dividends or
similar transactions and (ii) if permitted by law, by reason of the
anti-dilution provisions contained in the Securities Purchase Agreement and the
Warrants in accordance with the terms thereof (collectively, the "Rule 416
Securities"). In this regard, the Company agrees to use all reasonable efforts
to ensure that the maximum number of Registrable Securities which may be
registered pursuant to Rule 416 under the 1933 Act are covered by each
Registration Statement and, absent guidance from the SEC or other definitive
authority to the contrary, the Company shall use

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all reasonable efforts to affirmatively support and to not take any position
adverse to the position that each Registration Statement filed hereunder covers
all of the Rule 416 Securities. If the Company determines that the Registration
Statement filed hereunder does not cover all of the Rule 416 Securities, the
Company shall immediately (i) provide to each Investor written evidence setting
forth the basis for the Company's position and the authority therefor and (ii)
prepare and file an amendment to such Registration Statement or a new
Registration Statement in accordance with Section 2(g).

     g. Sufficient Number of Shares Registered. In the event the number of
shares available under a Registration Statement filed pursuant to Section 2(a)
is insufficient to cover all of the Registrable Securities or an Investor's
allocated portion of the Registrable Securities pursuant to Section 2(c) (a
"Deficit Failure"), the Company shall amend the Registration Statement, or file
a new Registration Statement (on the short form available therefor, if
applicable), or both, so as to cover at least one hundred percent (100%) of such
Registrable Securities in each case, as soon as practicable, but in any event
not later than fifteen (15) days after the necessity therefor arises. The
Company shall use it best efforts to cause such amendment and/or new
Registration Statement to become effective as soon as practicable following the
filing thereof. For purposes of the foregoing provision, the number of shares
available under a Registration Statement shall be deemed "insufficient to cover
all of the Registrable Securities" if at any time the number of Registrable
Securities is greater than the number of shares of Company common stock
available for resale under such Registration Statement.

     3. RELATED OBLIGATIONS.

     Whenever an Investor has requested that any Registrable Securities be
registered pursuant to Section 2(b) or at such time as the Company is obligated
to file a Registration Statement with the SEC pursuant to Section 2(a) or 2(g),
the Company will use its best efforts to effect the registration of the
Registrable Securities in accordance with the intended method of disposition
thereof and, pursuant thereto, the Company shall have the following obligations:

     a. Registration. The Company shall promptly prepare and file with the SEC a
Registration Statement with respect to the Registrable Securities (on or prior
to the sixtieth (60th) calendar day after the date hereof for the registration
of Registrable Securities pursuant to Section 2(a)) and use its best efforts to
cause such Registration Statement relating to the Registrable Securities to
become effective as soon as possible after such filing (but in no event later
than one-hundred twenty (120) calendar days after the date hereof for the
registration of Registrable Securities pursuant to Section 2(a)), and keep such
Registration Statement effective pursuant to Rule 415 at all times until the
earlier of (i) the second (2nd) annual anniversary of the date of this Agreement
or (ii) the date on which the Investors shall have sold all the Registrable
Securities (the "Registration Period"), which Registration Statement (including
any amendments or supplements thereto and prospectuses contained therein) shall
not contain any untrue statement of a material fact or omit to state a material
fact required to be stated therein, or necessary to make the statements therein,
in light of the circumstances in which they were made, not misleading.

     b. Amendments. The Company shall prepare and file with the SEC such
amendments (including post-effective amendments) and supplements to a
Registration Statement

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and the prospectus used in connection with such Registration Statement, which
prospectus is to be filed pursuant to Rule 424 promulgated under the 1933 Act,
as may be necessary to keep such Registration Statement effective at all times
during the Registration Period, and, during such period, comply with the
provisions of the 1933 Act with respect to the disposition of all Registrable
Securities of the Company covered by such Registration Statement until such time
as all of such Registrable Securities shall have been disposed of in accordance
with the intended methods of disposition by the seller or sellers thereof as set
forth in such Registration Statement.

     c. Legal Counsel Review. The Company shall permit Legal Counsel to review
and comment upon a Registration Statement and all amendments and supplements
thereto at least seven (7) days prior to their filing with the SEC, and not file
any document in a form to which Legal Counsel reasonably objects. The Company
shall not submit a request for acceleration of the effectiveness of a
Registration Statement or any amendment or supplement thereto without the prior
approval of Legal Counsel, which consent shall not be unreasonably withheld. The
Company shall furnish to Legal Counsel, without charge, (i) any correspondence
from the SEC or the staff of the SEC to the Company or its representatives
relating to any Registration Statement, (ii) promptly after the same is prepared
and filed with the SEC, one copy of any Registration Statement and any
amendment(s) thereto, including financial statements and schedules, all
documents incorporated therein by reference and all exhibits and (iii) upon the
effectiveness of any Registration Statement, one copy of the prospectus included
in such Registration Statement and all amendments and supplements thereto.

     d. Disclosure Materials. The Company shall furnish to each Investor whose
Registrable Securities are included in any Registration Statement, without
charge, (i) promptly after the same is prepared and filed with the SEC, at least
one copy of such Registration Statement and any amendment(s) thereto, including
financial statements and schedules, all documents incorporated therein by
reference and all exhibits, (ii) upon the effectiveness of any Registration
Statement, ten (10) copies of the prospectus included in such Registration
Statement and all amendments and supplements thereto (or such other number of
copies as such Investor may reasonably request) and (iii) such other documents,
including copies of any preliminary or final prospectus, as such Investor may
reasonably request from time to time in order to facilitate the disposition of
the Registrable Securities owned by such Investor.

     e. State Securities Laws. The Company shall use reasonable efforts to (i)
register and qualify the Registrable Securities covered by a Registration
Statement under such other securities or "blue sky" laws of such jurisdictions
in the United States as Legal Counsel or any Investor reasonably requests, (ii)
prepare and file in those jurisdictions, such amendments (including
post-effective amendments) and supplements to such registrations and
qualifications as may be necessary to maintain the effectiveness thereof during
the Registration Period, (iii) take such other actions as may be necessary to
maintain such registrations and qualifications in effect at all times during the
Registration Period, and (iv) take all other actions reasonably necessary or
advisable to qualify the Registrable Securities for sale in such jurisdictions;
provided, however, that the Company shall not be required in connection
therewith or as a condition thereto to (x) qualify to do business in any
jurisdiction where it would not otherwise be required to qualify but for this
Section 3(e), (y) subject itself to general taxation in any such jurisdiction,
or (z) file a general consent to service of process in any such jurisdiction.
The Company shall promptly notify Legal Counsel and each

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Investor who holds Registrable Securities of the receipt by the Company of any
notification with respect to the suspension of the registration or qualification
of any of the Registrable Securities for sale under the securities or "blue sky"
laws of any jurisdiction in the United States or its receipt of actual notice of
the initiation or threatening of any proceeding for such purpose.

     f. Underwriting Agreement. In the event Investors who hold a majority of
the Registrable Securities being offered in the offering select underwriters for
the offering, the Company shall enter into and perform its obligations under an
underwriting agreement, in usual and customary form, including, without
limitation, customary indemnification and contribution obligations, with the
underwriters of such offering.

     g. Notification. As promptly as practicable after becoming aware of such
event, the Company shall notify Legal Counsel and each Investor in writing of
the happening of any event as a result of which the prospectus included in a
Registration Statement, as then in effect, includes an untrue statement of a
material fact or omission to state a material fact required to be stated therein
or necessary to make the statements therein, in light of the circumstances under
which they were made, not misleading, and promptly prepare a supplement or
amendment to such Registration Statement to correct such untrue statement or
omission, and deliver ten (10) copies of such supplement or amendment to Legal
Counsel and each Investor (or such other number of copies as Legal Counsel or
such Investor may reasonably request). The Company shall also promptly notify
Legal Counsel and each Investor in writing (i) when a prospectus or any
prospectus supplement or post-effective amendment has been filed, and when a
Registration Statement or any post-effective amendment has become effective
(notification of such effectiveness shall be delivered to Legal Counsel and each
Investor by facsimile on the same day of such effectiveness and by overnight
mail), (ii) of any request by the SEC for amendments or supplements to a
Registration Statement or related prospectus or related information, and (iii)
of the Company's reasonable determination that a post-effective amendment to a
Registration Statement would be appropriate.

     h. Stop-Order and Suspension. The Company shall use its best efforts to
prevent the issuance of any stop order or other suspension of effectiveness of a
Registration Statement, or the suspension of the qualification of any of the
Registrable Securities for sale in any jurisdiction and, if such an order or
suspension is issued, to obtain the withdrawal of such order or suspension at
the earliest possible moment and to notify Legal Counsel and each Investor who
holds Registrable Securities being sold (and, in the event of an underwritten
offering, the managing underwriters) of the issuance of such order and the
resolution thereof or its receipt of actual notice of the initiation or threat
of any proceeding for such purpose.

     i. Requested Information. At the request of any Investor, the Company shall
furnish to such Investor, on the date of the effectiveness of the Registration
Statement and thereafter from time to time on such dates as an Investor may
reasonably request (i) if required by an underwriter, a letter, dated such date,
from the Company's independent certified public accountants in form and
substance as is customarily given by independent certified public accountants to
underwriters in an underwritten public offering, addressed to the underwriters,
and (ii) an opinion, dated as of such date, of counsel representing the Company
for purposes of such Registration Statement, in form, scope and substance as is
customarily given in an underwritten public offering, addressed to the
underwriters and the Investors.

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     j. Inspection. The Company shall make available for inspection by (i) any
Investor, (ii) Legal Counsel, (iii) any underwriter participating in any
disposition pursuant to a Registration Statement, (iv) one firm of accountants
or other agents retained by the Investors, and (v) one firm of attorneys
retained by such underwriters (collectively, the "Inspectors") all pertinent
financial and other records, and pertinent corporate documents and properties of
the Company (collectively, the "Records"), as shall be reasonably deemed
necessary by each Inspector, and cause the Company's officers, directors and
employees to supply all information which any Inspector may reasonably request;
provided, however, that each Inspector shall hold in strict confidence and shall
not make any disclosure (except to an Investor) or use of any Record or other
information which the Company determines in good faith to be confidential, and
of which determination the Inspectors are so notified, unless (a) the disclosure
of such Records is necessary to avoid or correct a misstatement or omission in
any Registration Statement or is otherwise required under the 1933 Act, (b) the
release of such Records is ordered pursuant to a final, non-appealable subpoena
or order from a court or government body of competent jurisdiction, or (c) the
information in such Records has been made generally available to the public
other than by disclosure in violation of this or any other agreement of which
the Inspector has knowledge. Each Investor agrees that it shall, upon learning
that disclosure of such Records is sought in or by a court or governmental body
of competent jurisdiction or through other means, give prompt notice to the
Company and allow the Company, at its expense, to undertake appropriate action
to prevent disclosure of, or to obtain a protective order for, the Records
deemed confidential.

     k. Confidential Information. The Company shall hold in confidence and not
make any disclosure of information concerning an Investor provided to the
Company unless (i) disclosure of such information is necessary to comply with
federal or state securities laws, (ii) the disclosure of such information is
necessary to avoid or correct a misstatement or omission in any Registration
Statement, (iii) the release of such information is ordered pursuant to a
subpoena or other final, non-appealable order from a court or governmental body
of competent jurisdiction, or (iv) such information has been made generally
available to the public other than by disclosure in violation of this Agreement
or any other agreement of which the Company has knowledge. The Company agrees
that it shall, upon learning that disclosure of such information concerning an
Investor is sought in or by a court or governmental body of competent
jurisdiction or through other means, give prompt written notice to such Investor
and allow such Investor, at the Investor's expense, to undertake appropriate
action to prevent disclosure of, or to obtain a protective order for, such
information.

     l. Listing. The Company shall use its best efforts either to (i) cause all
the Registrable Securities covered by a Registration Statement to be listed on
each securities exchange on which securities of the same class or series issued
by the Company are then listed, if any, if the listing of such Registrable
Securities is then permitted under the rules of such exchange, or (ii) secure
designation and quotation of all the Registrable Securities covered by the
Registration Statement on the Nasdaq Stock Market. The Company shall pay all
fees and expenses in connection with satisfying its obligation under this
Section 3(l).

     m. [Reserved.]

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     n. Transfer Agent. The Company shall provide a transfer agent and registrar
of all such Registrable Securities not later than the effective date of such
Registration Statement.

     o. Underwriter Requests. If requested by the managing underwriters or an
Investor, the Company shall (i) immediately incorporate in a prospectus
supplement or post-effective amendment such information as the managing
underwriters and the Investors agree should be included therein relating to the
sale and distribution of Registrable Securities, including, without limitation,
information with respect to the number of Registrable Securities being sold to
such underwriters, the purchase price being paid therefor by such underwriters
and any other terms of the underwritten (or best efforts underwritten) offering
of the Registrable Securities to be sold in such offering; (ii) make all
required filings of such prospectus supplement or post-effective amendment as
soon as notified of the matters to be incorporated in such prospectus supplement
or post-effective amendment; and (iii) supplement or make amendments to any
Registration Statement if requested by a shareholder or any underwriter of such
Registrable Securities.

     p. [Reserved.]

     q. [Reserved.]

     r. 1934 Act Compliance. The Company shall otherwise use its best efforts to
comply with all applicable rules and regulations of the SEC in connection with
any registration hereunder and the Company shall use its best efforts to file
with the SEC in a timely manner all reports and documents required of the
Company under the 1933 Act and the 1934 Act (as defined in Section 6(a)).

     s. Confirmation. Within two (2) business days after the Registration
Statement which includes the Registrable Securities is ordered effective by the
SEC, the Company shall deliver, and shall cause legal counsel for the Company to
deliver, to the transfer agent for such Registrable Securities (with copies to
the Investors whose Registrable Securities are included in such Registration
Statement) confirmation that the Registration Statement has been declared
effective by the SEC in the form attached hereto as Exhibit A. ---------

     t. [Reserved.]

     u. Disposition. The Company shall take all other reasonable actions
necessary to expedite and facilitate disposition by the Investors of Registrable
Securities pursuant to a Registration Statement.

     v. Limitation on Registration Statement. Notwithstanding anything to the
contrary contained in this Agreement, except to comply with the rights of
Ladenburg Thalmann & Co. as set forth in that certain investment banking
agreement (the "Investment Banking Agreement") dated April 11, 2000 with the
Company and the rights of any investor contemplated by the Investment Banking
Agreement, the Registration Statement shall register only the Registrable
Securities and the Company common stock and common shares underlying the
warrants purchased by the Other Purchasers (as defined in the Securities
Purchase Agreement) pursuant to the Offering (as defined in the Securities
Purchase Agreement).

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     4. OBLIGATIONS OF THE INVESTORS.

     a. At least seven (7) days prior to the first anticipated filing date of
the Registration Statement, the Company shall notify each Investor in writing of
the information the Company requires from each such Investor if such Investor
elects to have any of such Investor's Registrable Securities included in such
Registration Statement. It shall be a condition precedent to the obligations of
the Company to complete the registration pursuant to this Agreement with respect
to the Registrable Securities of a particular Investor that such Investor shall
furnish to the Company such information regarding itself and the Registrable
Securities held by it as shall be reasonably required to effect the registration
of such Registrable Securities and shall execute such documents in connection
with such registration as the Company may reasonably request.

     b. Each Investor by such Investor's acceptance of the Registrable
Securities agrees to cooperate with the Company as reasonably requested by the
Company in connection with the preparation and filing of any Registration
Statement hereunder, unless such Investor has notified the Company in writing of
such Investor's election to exclude all of such Investor's Registrable
Securities from such Registration Statement.

     c. In the event any Investor elects to participate in an underwritten
public offering pursuant to Section 2, each such Investor agrees to enter into
and perform such Investor's obligations under an underwriting agreement, in
usual and customary form, including, without limitation, customary
indemnification and contribution obligations, with the managing underwriter of
such offering and take such other actions as are reasonably required in order to
expedite or facilitate the disposition of the Registrable Securities.

     d. Each Investor is aware of the prohibitions against certain market
activities by participants in a distribution of securities that are contained in
Regulation M ("Regulation M") promulgated under the Securities Exchange Act of
1934, as amended (the "1934 Act"). Each Investor understands that the resale of
Registrable Securities pursuant to the Registration Statement may constitute a
distribution of such securities, within the meaning of Regulation M, depending
upon the amount of Registrable Securities offered for resale and whether or not
special selling efforts and methods are used in connection with such resales.
Each Investor agrees to avoid any market activity proscribed by Regulation M,
and consents to the Company's suspension of such Investor's rights under Section
2(u) above at any time that resales of Registrable Securities by such Investor
are or then would be in violation of Regulation M.

     5. EXPENSES OF REGISTRATION.

     All reasonable expenses, other than underwriting discounts and commissions,
incurred in connection with registrations, filings or qualifications pursuant to
Sections 2 and 3, including, without limitation, all registration, listing and
qualifications fees, printers and accounting fees, and fees and disbursements of
counsel for the Company and, in the event the Company fails to comply with the
reasonable requests of Legal Counsel made pursuant to Section 3(c) of this
Agreement, the fees and disbursements of Legal Counsel, shall be paid by the
Company.

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     6. INDEMNIFICATION.

     In the event any Registrable Securities are included in a Registration
Statement under this Agreement:

     a. To the fullest extent permitted by law, the Company will, and hereby
does, indemnify, hold harmless and defend each Investor who holds such
Registrable Securities, the directors, officers, partners, employees, agents,
representatives of, and each Person, if any, who controls any Investor within
the meaning of the 1933 Act or the 1934 Act, and any underwriter (as defined in
the 1933 Act) for the Investors, and the directors and officers of, and each
Person, if any, who controls, any such underwriter within the meaning of the
1933 Act or the 1934 Act (each, an "Indemnified Person"), subject to Section
6(d) below, against any losses, claims, damages, liabilities, judgments, fines,
penalties, charges, costs, attorneys' fees, amounts paid in settlement or
expenses, joint or several, (collectively, "Indemnified Damages") incurred in
investigating, preparing or defending any action, claim, suit, inquiry,
proceeding, investigation or appeal taken from the foregoing by or before any
court or governmental, administrative or other regulatory agency, body or the
SEC, whether pending or threatened, whether or not an indemnified party is or
may be a party thereto ("Claims"), to which any of them may become subject
insofar as such Claims (or actions or proceedings, whether commenced or
threatened, in respect thereof) arise out of or are based upon: (i) any untrue
statement or alleged untrue statement of a material fact in a Registration
Statement or any post-effective amendment thereto or in any filing made in
connection with the qualification of the offering under the securities or other
"blue sky" laws of any jurisdiction in which Registrable Securities are offered
("Blue Sky Filing"), or the omission or alleged omission to state a material
fact required to be stated therein or necessary to make the statements therein
not misleading, (ii) any untrue statement or alleged untrue statement of a
material fact contained in any preliminary prospectus if used prior to the
effective date of such Registration Statement, or contained in the final
prospectus (as amended or supplemented, if the Company files any amendment
thereof or supplement thereto with the SEC) or the omission or alleged omission
to state therein any material fact necessary to make the statements made
therein, in light of the circumstances under which the statements therein were
made, not misleading, (iii) any violation or alleged violation by the Company of
the 1933 Act, the 1934 Act, any other law, including, without limitation, any
state securities law, or any rule or regulation thereunder relating to the offer
or sale of the Registrable Securities pursuant to a Registration Statement or
(iv) any material violation of this Agreement (the matters in the foregoing
clauses (i) through (iv) being, collectively, "Violations"). The Company shall
reimburse the Investors and each such underwriter or controlling person,
promptly as such expenses are incurred and are due and payable, for any legal
fees or other reasonable expenses incurred by them in connection with
investigating or defending any such Claim. Notwithstanding anything to the
contrary contained herein, the indemnification agreement contained in this
Section 6(a): (i) shall not apply to a Claim by an Indemnified Person arising
out of or based upon a Violation which occurs in reliance upon and in conformity
with information furnished in writing to the Company by such Indemnified Person
or underwriter for such Indemnified Person expressly for use in connection with
the preparation of the Registration Statement or any such amendment thereof or
supplement thereto, if such prospectus was timely made available by the Company
pursuant to Section 3(d); (ii) with respect to any preliminary prospectus, shall
not inure to the benefit of any such person from whom

                                       10
<PAGE>

the person asserting any such Claim purchased the Registrable Securities that
are the subject thereof (or to the benefit of any person controlling such
person) if the untrue statement or omission of material fact contained in the
preliminary prospectus was corrected in the prospectus, as then amended or
supplemented, if such prospectus was timely made available by the Company
pursuant to Section 3(d), and the Indemnified Person was promptly advised in
writing not to use the incorrect prospectus prior to the use giving rise to a
violation and such Indemnified Person, notwithstanding such advice, used it;
(iii) shall not be available to the extent such Claim is based on a failure of
the Investor to deliver properly or to cause to be delivered properly the
prospectus made available by the Company, if such prospectus was timely made
available by the Company pursuant to Section 3(d); and (iv) shall not apply to
amounts paid in settlement of any Claim if such settlement is effected without
the prior written consent of the Company, which consent shall not be
unreasonably withheld. Such indemnity shall remain in full force and effect
regardless of any investigation made by or on behalf of the Indemnified Person
and shall survive the transfer of the Registrable Securities by the Investors
pursuant to Section 9.

     b. In connection with any Registration Statement in which an Investor is
participating, each such Investor agrees to severally and not jointly indemnify,
hold harmless and defend, to the same extent and in the same manner as is set
forth in Section 6(a), the Company, each of its directors, each of its officers
who signs the Registration Statement, each Person, if any, who controls the
Company within the meaning of the 1933 Act or the 1934 Act (collectively and
together with an Indemnified Person, an "Indemnified Party"), against any Claim
or Indemnified Damages to which any Indemnified Party may become subject, under
the 1933 Act, the 1934 Act or otherwise, insofar as such Claim or Indemnified
Damages arise out of or are based upon (i) any Violation, in each case to the
extent, and only to the extent, that such Violation occurs in reliance upon and
in conformity with written information furnished to the Company by such Investor
expressly for use in connection with such Registration Statement, and (ii) any
Violation, in each case to the extent and only to the extent that such Violation
occurs as a result of the failure of an Investor to deliver properly or to cause
to be delivered properly the prospectus made available by the Company, if such
prospectus was timely made available by the Company pursuant to Section 3(d);
and, subject to Section 6(d), such Investor will reimburse any legal or other
expenses reasonably incurred by them in connection with investigating or
defending any such Claim; provided, however, that the indemnity agreement
contained in this Section 6(b) and the agreement with respect to contribution
contained in Section 7 shall not apply to amounts paid in settlement of any
Claim if such settlement is effected without the prior written consent of such
Investor, which consent shall not be unreasonably withheld; provided, further,
however, that the Investor shall be liable under this Section 6(b) for only that
amount of a Claim or Indemnified Damages as does not exceed the net proceeds to
such Investor as a result of the sale of Registrable Securities pursuant to such
Registration Statement. Such indemnity shall remain in full force and effect
regardless of any investigation made by or on behalf of such Indemnified Party
and shall survive the transfer of the Registrable Securities by the Investors
pursuant to Section 9. Notwithstanding anything to the contrary contained
herein, the indemnification agreement contained in this Section 6(b) with
respect to any preliminary prospectus shall not inure to the benefit of any
Indemnified Party if the untrue statement or omission of material fact contained
in the preliminary prospectus was corrected on a timely basis in the prospectus,
as then amended or supplemented.

                                       11
<PAGE>

                  c. The Company shall be entitled to receive indemnities from
underwriters, selling brokers, dealer managers and similar securities industry
professionals participating in any distribution, to the same extent as provided
above, with respect to information such persons so furnished in writing
expressly for inclusion in the Registration Statement.

     d. Promptly after receipt by an Indemnified Person or Indemnified Party
under this Section 6 of notice of the commencement of any action or proceeding
(including any governmental action or proceeding) involving a Claim, such
Indemnified Person or Indemnified Party shall, if a Claim in respect thereof is
to be made against any indemnifying party under this Section 6, 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 control of the defense thereof with counsel
mutually satisfactory to the indemnifying party and the Indemnified Person or
the Indemnified Party, as the case may be; provided, however, that an
Indemnified Person or Indemnified Party shall have the right to retain its own
counsel with the fees and expenses to be paid by the indemnifying party, if, in
the reasonable opinion of counsel retained by the indemnifying party, the
representation by such counsel of the Indemnified Person or Indemnified Party
and the indemnifying party would be inappropriate due to actual or potential
differing interests between such Indemnified Person or Indemnified Party and any
other party represented by such counsel in such proceeding. The Company shall
pay reasonable fees for only one separate legal counsel for the Investors, and
such legal counsel shall be selected by the Investors holding a majority in
interest of the Registrable Securities included in the Registration Statement to
which the Claim relates. The Indemnified Party or Indemnified Person shall
cooperate fully with the indemnifying party in connection with any negotiation
or defense of any such action or claim by the indemnifying party and shall
furnish to the indemnifying party all information reasonably available to the
Indemnified Party or Indemnified Person which relates to such action or claim.
The indemnifying party shall keep the Indemnified Party or Indemnified Person
fully apprized at all times as to the status of the defense or any settlement
negotiations with respect thereto. No indemnifying party shall be liable for any
settlement of any action, claim or proceeding effected without its written
consent, provided, however, that the indemnifying party shall not unreasonably
withhold, delay or condition its consent. No indemnifying party shall, without
the consent of the Indemnified Party or Indemnified Person, consent to entry of
any judgment or enter into any settlement or other compromise which does not
include as an unconditional term thereof the giving by the claimant or plaintiff
to such Indemnified Party or Indemnified Person of a release from all liability
in respect to such claim or litigation. Following indemnification as provided
for hereunder, the indemnifying party shall be subrogated to all rights of the
Indemnified Party or Indemnified Person with respect to all third parties, firms
or corporations relating to the matter for which indemnification has been made.
The failure to deliver written notice to the indemnifying party within a
reasonable time of the commencement of any such action shall not relieve such
indemnifying party of any liability to the Indemnified Person or Indemnified
Party under this Section 6, except to the extent that the indemnifying party is
prejudiced in its ability to defend such action.

     e. The indemnification required by this Section 6 shall be made by periodic
payments of the amount thereof during the course of the investigation or
defense, as and when bills are received or Indemnified Damages are incurred.

                                       12
<PAGE>

     f. The indemnity agreements contained herein shall be in addition to (i)
any cause of action or similar right of the Indemnified Party or Indemnified
Person against the indemnifying party or others, and (ii) any liabilities the
indemnifying party may be subject to pursuant to the law.

     7. CONTRIBUTION.

     To the extent any indemnification by an indemnifying party is prohibited or
limited by law, the indemnifying party agrees to make the maximum contribution
with respect to any amounts for which it would otherwise be liable under Section
6 to the fullest extent permitted by law; provided, however, that: (i) no seller
of Registrable Securities guilty of fraudulent misrepresentation (within the
meaning of Section 11(f) of the 1933 Act) shall be entitled to contribution from
any seller of Registrable Securities who was not guilty of fraudulent
misrepresentation; and (ii) contribution by any seller of Registrable Securities
shall be limited in amount to the net amount of proceeds received by such seller
from the sale of such Registrable Securities.

     8. LIQUIDATED DAMAGES.

     a. The Company agrees that an Investor will suffer damages if the Company
violates any provision of or fails to fulfill its obligations pursuant to
Sections 2(a), 2(b), 2(g), 3(a), 3(b), 3(e), 3(h), 3(l) and 3(v) of this
Agreement (a "Registration Default") and that it would not be possible to
ascertain the extent of such damages. Accordingly, in the event of such
Registration Default, the Company hereby agrees to pay liquidated damages
("Liquidated Damages") to such Investor following the occurrence of such
Registration Default in an amount determined by multiplying (i) two percent (2%)
of the Buyer Offering Per Share Purchase Price (as defined in the Securities
Purchase Agreement) per Common Share then held by such Investor by (ii) the
percentage derived by dividing (A) the actual number of days elapsed from the
first day of the date that an uncured Registration Default occurred or the end
of the prior 30-day period, as applicable, to the day all Registration Defaults
have been completely cured, by (B) 30. Liquidated Damages shall be paid in cash,
or at the Buyer's option, in the number of shares of Company common stock equal
to the quotient of (v) the dollar amount of the Liquidated Damages due on the
Payment Date (as defined below) divided by (w) the closing bid price of the
Company's common stock (as quoted in the Principal Market or the market or
exchange where the Company's common stock is then traded) as of the first day
that an uncured Registration Default occurred. The Liquidated Damages payable
pursuant hereto shall be payable within five (5) business days from the end of
the 30-day period commencing on the first 30-day period in which the
Registration Default occurs (each, a "Payment Date"). In the event the
Liquidated Damages are paid in shares of Company common stock, such shares shall
also be considered Common Shares and shall have the registration rights set
forth in this Agreement. Notwithstanding anything to the contrary herein, in no
event shall the Company issue shares of common stock pursuant to this Section 8
which, when added to other Registrable Securities purchased by Buyers pursuant
to the Securities Purchase Agreement, would (i) result in a change of control of
the Company, or (ii) represent 20% or more of the total number of shares of
common stock or voting power of the Company outstanding immediately prior to the
Closing Date (defined in the Securities Purchase Agreement).

                                       13
<PAGE>

     b. Notwithstanding anything to the contrary in Section 8(a) above:

     (i)  the Company shall have the right to pay Liquidated Damages in cash
          irrespective of any Investor's election to receive shares of Company
          Common Stock in settlement thereof if the closing bid price of the
          Company's Common Stock as determined under clause (w) above is less
          than the Buyer Offering Per Share Purchase Price per share.

     (ii) in the event of a Registration Default under Section 2(g), Liquidated
          Damages shall be payable in an amount determined by multiplying (A)
          the amount of Liquidated Damages as calculated by Section 8(a) above,
          by (B) a fraction, the numerator of which fraction shall be the total
          number of Common Shares held by the Investor or which the Investor is
          entitled to receive and which have not been registered under the
          Registration Statement, and the denominator of which fraction shall be
          the total number of Common Shares held by the Investor and which the
          Investor is entitled to receive.

     (iii) no Registration Default shall be deemed to have occurred hereunder:

          (A)  (1) under Section 2(g) if the Deficit Failure is the result of a
               merger or other reorganization requiring the amendment of the
               Registration Statement involving the restatement or filing of
               additional or restated financial statements, provided, however,
               that the Company diligently proceeds and utilizes its best
               efforts to satisfy its obligations under Section 3(b) and Section
               2(g) of this Agreement, or (2) in the event that, pursuant to
               Section 2(g) of this Agreement, the Company has reserved and
               registered for resale the initial Common Shares purchased by the
               Buyers as set forth in Section 1 of the Securities Purchase
               Agreement pursuant to the Securities Purchase Agreement, under
               Section 2(g) if the Deficit Failure is the result of a failure to
               register a number of Common Shares which represent 5% or less of
               the additional number of Common Shares issued to such Investor
               pursuant to this Agreement or the Securities Purchase Agreement
               in excess of such initial Common Shares purchased by the Buyers
               as set forth in Section 1 of the Securities Purchase Agreement,
               provided, however, that the Company diligently proceeds and
               utilizes its best efforts to satisfy its obligations under
               Section 2(g) of this Agreement.

          (B)  under Section 3(a) or Section 3(b) for failing to keep the
               Registration Statement effective at all times if such failure is
               due to a merger or other acquisition or reorganization, a
               recapitalization involving the filing of new or restating of
               previously filed financial statements, or other material
               corporate developments involving any entity or business engaged
               in the same industry or business of the Company, provided,
               however, that the Company proceeds diligently and utilizes

                                       14
<PAGE>

               its best efforts to satisfy its obligations under Section 3(a) or
               Section 3(b) of this Agreement.

          (C)  under Section 3(h) in respect of any suspension of effectiveness
               or withdrawal of the Registration Statement, or stop order
               relating thereto, or suspension of sales under the Registration
               Statement pending the filing and effectiveness of a
               post-effective amendment to the Registration Statement that is
               made necessary by a merger or other acquisition or
               reorganization, a recapitalization involving the filing of new or
               restating of previously filed financial statements, or other
               material corporate developments involving any entity or business
               engaged in the same industry or business of the Company,
               provided, however, that the Company proceeds diligently and
               utilizes its best efforts to satisfy its obligations under
               Section 3(h) of this Agreement.

     9. ASSIGNMENT OF REGISTRATION RIGHTS.

     The rights under this Agreement shall be automatically assignable by the
Investors to any transferee of all or any portion of Registrable Securities if:
(i) the Investor agrees in writing with the transferee or assignee to assign
such rights, and a copy of such agreement is furnished to the Company within a
reasonable time after such assignment; (ii) the Company is, within a reasonable
time after such transfer or assignment, furnished with written notice of (a) the
name and address of such transferee or assignee, and (b) the securities with
respect to which such registration rights are being transferred or assigned;
(iii) immediately following such transfer or assignment the further disposition
of such securities by the transferee or assignee is restricted under the 1933
Act and applicable state securities laws; provided, however, that the transferee
or assignee may subsequently transfer or assign all or any portion of the
Registrable Securities if an exemption from registration under the 1933 Act is
applicable to such transfer or assignment; (iv) at or before the time the
Company receives the written notice contemplated by clause (ii) of this sentence
the transferee or assignee agrees in writing with the Company to be bound by all
of the provisions contained herein; and (v) such transfer shall have been made
in accordance with the applicable requirements of the Securities Purchase
Agreement.

     10. AMENDMENT OF REGISTRATION RIGHTS.

     Provisions of this Agreement may be amended and the observance thereof may
be waived (either generally or in a particular instance and either retroactively
or prospectively), only with the written consent of the Company and Investors
who then hold two-thirds (2/3) of the Registrable Securities. Any amendment or
waiver effected in accordance with this Section 10 shall be binding upon each
Investor and the Company. No such amendment shall be effective to the extent
that it applies to less than all of the holders of the Registrable Securities.
No consideration shall be offered or paid to any Person to amend or consent to a
waiver or modification of any provision of any of this Agreement unless the same
consideration also is offered to all of the parties to this Agreement.

                                       15
<PAGE>

     11. MISCELLANEOUS.

     a. A Person is deemed to be a holder of Registrable Securities whenever
such Person owns or is deemed to own of record such Registrable Securities. If
the Company receives conflicting instructions, notices or elections from two or
more Persons with respect to the same Registrable Securities, the Company shall
act upon the basis of instructions, notice or election received from the
registered owner of such Registrable Securities.

     b. Any notices, consents, waivers or other communications required or
permitted to be given under the terms of this Agreement must be in writing and
will be deemed to have been delivered: (i) upon receipt, when delivered
personally; (ii) upon receipt, when sent by facsimile (provided confirmation of
transmission is mechanically or electronically generated and kept on file by the
sending party); or (iii) one business day after deposit with a nationally
recognized overnight delivery service, in each case properly addressed to the
party to receive the same. The addresses and facsimile numbers for such
communications shall be:

                  If to the Company:

                           Generex Biotechnology Corporation
                           33 Harbour Square, Suite 202
                           Toronto, Canada M5J 2G2
                           Telephone: (416) 364-2551
                           Facsimile:  (416) 364-9363
                           Attention: E.  Mark Perri

                  With a copy to:

                           Eckert Seamans Cherin & Mellott
                           1515 Market Street, 9th Floor
                           Philadelphia, Pennsylvania 19102-1909
                           Telephone: (215)851-8400
                           Facsimile: (215) 851-8383
                           Attention: Joseph Chicco, Esq.

                                       16
<PAGE>

                  If to Legal Counsel:

                           Strategic Investment Counsel, LLC
                           666 Dundee Road, Suite 1901
                           Northbrook, Illinois 60062
                           Telephone:       (847) 564-9293
                           Facsimile:       (847) 564-5497
                           Attention:       Anthony J. Ribaudo, Esq.

If to a Buyer, to it at the address and facsimile number set forth on the
Schedule of Buyers attached hereto, with copies to such Buyer's representatives
as set forth on the Schedule of Buyers, or at such other address and/or
facsimile number and/or to the attention of such other person as the recipient
party has specified by written notice given to each other party five days prior
to the effectiveness of such change.

     c. Failure of any party to exercise any right or remedy under this
Agreement or otherwise, or delay by a party in exercising such right or remedy,
shall not operate as a waiver thereof.

     d. This Agreement shall be governed by and construed in all respects by the
internal laws of the State of Illinois (except for the proper application of the
United States federal securities laws), without giving effect to any choice of
law or conflict of law provision or rule (whether of the State of Illinois or
any other jurisdictions) that would cause the application of the laws of any
jurisdictions other than the State of Illinois. Each party hereby irrevocably
submits to the non-exclusive jurisdiction of the state and federal courts
sitting the City of Chicago, for the adjudication of any dispute hereunder. If
any provision of this Agreement shall be invalid or unenforceable in any
jurisdiction, such invalidity or unenforceability shall not affect the validity
or enforceability of the remainder of this Agreement in that jurisdiction or the
validity or enforceability of any provision of this Agreement in any other
jurisdiction.

     e. This Agreement, the Securities Purchase Agreement and the Warrants
constitute the entire agreement among the parties hereto with respect to the
subject matter hereof and thereof. There are no restrictions, promises,
warranties or undertakings, other than those set forth or referred to herein and
therein. This Agreement, the Securities Purchase Agreement and the Warrants
supersede all prior agreements and understandings among the parties hereto with
respect to the subject matter hereof and thereof.

     f. Subject to the requirements of Section 9, this Agreement shall inure to
the benefit of and be binding upon the permitted successors and assigns of each
of the parties hereto.

     g. The headings in this Agreement are for convenience of reference only and
shall not limit or otherwise affect the meaning hereof.

     h. This Agreement may be executed in identical counterparts, each of which
shall be deemed an original but all of which shall constitute one and the same
agreement. This Agreement, once executed by a party, may be delivered to the
other party hereto by facsimile

                                       17
<PAGE>

transmission of a copy of this Agreement bearing the signature of the party so
delivering this Agreement.

     i. Each party shall do and perform, or cause to be done and performed, all
such further acts and things, and shall execute and deliver all such other
agreements, certificates, instruments and documents, as the other party may
reasonably request in order to carry out the intent and accomplish the purposes
of this Agreement and the consummation of the transactions contemplated hereby.

     j. All consents and other determinations to be made by the Investors
pursuant to this Agreement shall be made, unless otherwise specified in this
Agreement, by Investors holding a majority of the Registrable Securities.

     k. The language used in this Agreement will be deemed to be the language
chosen by the parties to express their mutual intent and no rules of strict
construction will be applied against any party.

     l. This Agreement is intended for the benefit of the parties hereto and
their respective permitted successors and assigns, and is not for the benefit
of, nor may any provision hereof be enforced by, any other Person.

                            [Signature Page Follows]

                                       18
<PAGE>

         IN WITNESS WHEREOF, the parties have caused this Registration Rights
Agreement to be duly executed as of day and year first above written.

COMPANY:                                   BUYERS:

GENEREX BIOTECHNOLOGY                      PROTIUS OVERSEAS LIMITED
CORPORATION

By:                                        By:
   -------------------------------------      ----------------------------------
Name:                                      Name:
     -----------------------------------         -------------------------------
Title:                                     Title:
      ----------------------------------          ------------------------------

                                           PHOTON FUND LTD.

                                           By:
                                              ----------------------------------
                                           Name:
                                                --------------------------------
                                           Title:
                                                 -------------------------------

<PAGE>

                               SCHEDULE OF BUYERS

                                              Investor's Address
     Investor Name                           and Facsimile Number
     ------------------------           -----------------------------

<PAGE>

                                                                       EXHIBIT A
                         FORM OF NOTICE OF EFFECTIVENESS
                            OF REGISTRATION STATEMENT

[TRANSFER AGENT]
Attn:
     ---------------------------------

     Re: GENEREX BIOTECHNOLOGY CORPORATION

Ladies and Gentlemen:

     We are counsel to Generex Biotechnology Corporation, a Delaware corporation
(the "Company"), and have represented the Company in connection with that
certain Securities Purchase Agreement (the "Purchase Agreement") entered into by
and among the Company and the buyers named therein (collectively, the "Holders")
pursuant to which the Company issued to the Holders shares of its Common Stock,
par value $.001 per share, (the "Common Shares") and the Warrants (the
Warrants). Pursuant to the Purchase Agreement, the Company also has entered into
a Registration Rights Agreement with the Holders (the "Registration Rights
Agreement") pursuant to which the Company agreed, among other things, to
register the Registrable Securities (as defined in the Registration Rights
Agreement), including the Common Shares, under the Securities Act of 1933, as
amended (the "1933 Act"). In connection with the Company's obligations under the
Registration Rights Agreement, on__________________, the Company filed a
Registration Statement on Form S-3 (File No. _____________) (the "Registration
Statement") with the Securities and Exchange Commission (the "SEC") relating to
the Registrable Securities which names each of the Holders as a selling
stockholder thereunder.

     In connection with the foregoing, we advise you that a member of the SEC's
staff has advised us by telephone that the SEC has entered an order declaring
the Registration Statement effective under the 1933 Act at [ENTER TIME OF
EFFECTIVENESS] on [ENTER DATE OF EFFECTIVENESS] and we have no knowledge, after
telephonic inquiry of a member of the SEC's staff, that any stop order
suspending its effectiveness has been issued or that any proceedings for that
purpose are pending before, or threatened by, the SEC and the Registrable
Securities are available for resale under the 1933 Act pursuant to the
Registration Statement.

                                        Very truly yours,

                                        [ISSUER'S COUNSEL]

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

cc:         [LIST NAMES OF HOLDERS]REGISTRATION RIGHTS AGREEMENT (US)

     This REGISTRATION RIGHTS AGREEMENT (this "Agreement"), dated as of May ___,
2000, is entered into by and among Generex Biotechnology Corporation, a Delaware
corporation, with headquarters located at 33 Harbour Square, Suite 202, Toronto,
Canada M5J 2G2 (the "Company"), and the undersigned buyers (each, a "Buyer" and,
collectively, the "Buyers").

     WHEREAS:

     A. In connection with one or more substantially identical Securities
Purchase Agreements by and among the Company, the Buyers and certain "Other
Purchasers", as that term is defined in the Securities Purchase Agreement(s),
the Company has sold and Buyers have purchased Units of securities of the
Company (the "Units") consisting of the Company's Common Stock, par value $.001
per share (the "Common Shares") and Warrants (the "Warrants") to purchase an
equivalent number of shares of the Company's Common Stock (the "Warrant
Shares"); and

     B. To induce purchasers of the Units to execute and deliver such Securities
Purchase Agreement(s) (hereinafter referred to, collectively, as the "Securities
Purchase Agreement"), the Company has agreed to provide certain registration
rights to such purchasers under the Securities Act of 1933, as amended, and the
rules and regulations thereunder, or any similar successor statute
(collectively, the "1933 Act"), and applicable state securities laws.

     NOW, THEREFORE, in consideration of the premises and the mutual covenants
contained herein and other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the Company and the Buyers hereby
agree as follows:

     1. DEFINITIONS.

     As used in this Agreement, the following terms shall have the following
meanings:

     a. "Investor" means a Buyer, any transferee or assignee thereof to whom a
Buyer assigns its rights under this Agreement and who agrees to become bound by
the provisions of this Agreement in accordance with Section 9 and any transferee
or assignee thereof to whom a transferee or assignee assigns its rights under
this Agreement and who agrees to become bound by the provisions of this
Agreement in accordance with Section 9.

     b. "Person" means a corporation, a limited liability company, an
association, a partnership, an organization, a business, an individual, a
governmental or political subdivision thereof or a governmental agency.

     c. "Register," "registered," and "registration" refer to a registration
effected by preparing and filing one or more Registration Statements (as defined
below) in compliance with the 1933 Act and pursuant to Rule 415 under the 1933
Act or any successor rule providing for

<PAGE>

offering securities on a continuous basis ("Rule 415"), and the declaration or
ordering of effectiveness of such Registration Statement(s) by the United States
Securities and Exchange Commission (the "SEC").

     d. "Registrable Securities" means the Common Shares purchased pursuant to
the Securities Purchase Agreement and the Warrant Shares issued or issuable upon
exercise of the Warrants and any shares of capital stock issued or issuable with
respect to the Common Shares, Warrants or Warrant Shares as a result of any
stock split, stock dividend, recapitalization, exchange, anti-dilution rights or
similar event or otherwise, without regard to any limitation on exercise of the
Warrants.

     e. "Registration Statement" means a registration statement of the Company
filed under the 1933 Act and pursuant to Rule 415.

Capitalized terms used herein and not otherwise defined herein shall have the
respective meanings set forth in the Securities Purchase Agreement.

     2. REGISTRATION.

     a. Mandatory Registration. The Company shall prepare, and, as soon as
practicable but in no event later than sixty (60) calendar days after the date
hereof, file with the SEC a Registration Statement or Registration Statements
(as is necessary) on Form S-3 (or if such form is unavailable, such other form
as is available for registration) covering the resale of all of the Registrable
Securities. The initial Registration Statement prepared pursuant hereto shall
register for resale at least that number of Company common stock shares equal to
the number of Registrable Securities as of the date immediately preceding the
date the Registration Statement is initially filed with the SEC, subject to
adjustment as provided in Section 3(b). The Company shall use its best efforts
to have the Registration Statement declared effective by the SEC as soon as
practicable, but in no event later than one-hundred twenty (120) calendar days
after the date hereof.

     b. Piggy-Back Registrations. If at any time prior to the expiration of the
Registration Period (as defined in Section 3(a)) that the Registrable Securities
are not already covered by an effective Registration Statement the Company
proposes to file with the SEC a Registration Statement relating to an offering
for its own account or the account of others under the 1933 Act of any of its
securities (other than on Form S-4 or Form S-8 (or their equivalents at such
time) relating to securities to be issued solely in connection with any
acquisition of any entity or business or equity securities issuable in
connection with stock option or other employee benefit plans) the Company shall
promptly send to each Investor written notice of the Company's intention to file
a Registration Statement and of such Investor's rights under this Section 2(b)
and, if within twenty (20) days after receipt of such notice, such Investor
shall so request in writing, the Company shall include in such Registration
Statement all or any part of the Registrable Securities such Investor requests
to be registered, subject to the priorities set forth in Section 2(b) below. No
right to registration of Registrable Securities under this Section 2(b) shall be
construed to limit any registration required under Section 2(a). The obligations
of the Company under this Section 2(b) may be waived by the Investors. If an
offering in connection with which an Investor is entitled to

                                       2
<PAGE>

registration under this Section 2(b) is an underwritten offering, then each
Investor whose Registrable Securities are included in such Registration
Statement shall, unless otherwise agreed by the Company, offer and sell such
Registrable Securities in an underwritten offering using the same underwriter or
underwriters and, subject to the provisions of this Agreement, on the same terms
and conditions as other shares of Company common stock included in such
underwritten offering. If a registration pursuant to this Section 2(b) is to be
an underwritten public offering and the managing underwriter(s) advise the
Company in writing, that in their reasonable good faith opinion, marketing or
other factors dictate that a limitation on the number of shares of Company
common stock which may be included in the Registration Statement is necessary to
facilitate and not adversely affect the proposed offering, then the Company
shall include in such registration: (1) first, all securities the Company
proposes to sell for its own account, (2) second, up to the full number of
securities proposed to be registered for the account of the holders of
securities entitled to inclusion of their securities in the Registration
Statement by reason of demand registration rights, and (3) third, the securities
requested to be registered by the Investors and other holders of securities
entitled to participate in the registration, as of the date hereof, drawn from
them pro rata based on the number each has requested to be included in such
registration.

     c. Allocation of Registrable Securities. The initial number of Registrable
Securities included in any Registration Statement and each increase in the
number of Registrable Securities included therein shall be allocated pro rata
among the Investors based on the number of Registrable Securities held, or which
could be held, by each Investor at the time the Registration Statement covering
such initial number of Registrable Securities or increase thereof is declared
effective by the SEC. In the event that an Investor sells or otherwise transfers
any of such Person's Registrable Securities, each transferee shall be allocated
a pro rata portion of the then remaining number of Registrable Securities
included in such Registration Statement for such transferor. Any Common Shares
included in a Registration Statement and which remain allocated to any Person
which ceases to hold any Registrable Securities shall be allocated to the
remaining Investors, pro rata based on the number of Registrable Securities then
held by such Investors.

     d. Legal Counsel. The Investors shall have the right to select legal
counsel to review and oversee at their expense any Registration Statement
proposed to be filed pursuant to this Section 2 ("Legal Counsel"). The Company
shall reasonably cooperate with Legal Counsel in performing the Company's
obligations under this Agreement.

     e. [Reserved.]

     f. Rule 416. The Company and the Investors each acknowledge that each
Registration Statement prepared in accordance hereunder shall include an
indeterminate number of Registrable Securities pursuant to Rule 416 under the
1933 Act so as to cover any and all Registrable Securities which may become
issuable (i) to prevent dilution resulting from stock splits, stock dividends or
similar transactions and (ii) if permitted by law, by reason of the
anti-dilution provisions contained in the Securities Purchase Agreement and the
Warrants in accordance with the terms thereof (collectively, the "Rule 416
Securities"). In this regard, the Company agrees to use all reasonable efforts
to ensure that the maximum number of Registrable Securities which may be
registered pursuant to Rule 416 under the 1933 Act are covered by each
Registration Statement and,

                                       3
<PAGE>

absent guidance from the SEC or other definitive authority to the contrary, the
Company shall use all reasonable efforts to affirmatively support and to not
take any position adverse to the position that each Registration Statement filed
hereunder covers all of the Rule 416 Securities. If the Company determines that
the Registration Statement filed hereunder does not cover all of the Rule 416
Securities, the Company shall immediately (i) provide to each Investor written
evidence setting forth the basis for the Company's position and the authority
therefor and (ii) prepare and file an amendment to such Registration Statement
or a new Registration Statement in accordance with Section 2(g).

     g. Sufficient Number of Shares Registered. In the event the number of
shares available under a Registration Statement filed pursuant to Section 2(a)
is insufficient to cover all of the Registrable Securities or an Investor's
allocated portion of the Registrable Securities pursuant to Section 2(c) (a
"Deficit Failure"), the Company shall amend the Registration Statement, or file
a new Registration Statement (on the short form available therefor, if
applicable), or both, so as to cover at least one hundred percent (100%) of such
Registrable Securities in each case, as soon as practicable, but in any event
not later than fifteen (15) days after the necessity therefor arises. The
Company shall use it best efforts to cause such amendment and/or new
Registration Statement to become effective as soon as practicable following the
filing thereof. For purposes of the foregoing provision, the number of shares
available under a Registration Statement shall be deemed "insufficient to cover
all of the Registrable Securities" if at any time the number of Registrable
Securities is greater than the number of shares of Company common stock
available for resale under such Registration Statement.

     3. RELATED OBLIGATIONS.

     Whenever an Investor has requested that any Registrable Securities be
registered pursuant to Section 2(b) or at such time as the Company is obligated
to file a Registration Statement with the SEC pursuant to Section 2(a) or 2(g),
the Company will use its best efforts to effect the registration of the
Registrable Securities in accordance with the intended method of disposition
thereof and, pursuant thereto, the Company shall have the following obligations:

     a. Registration. The Company shall promptly prepare and file with the SEC a
Registration Statement with respect to the Registrable Securities (on or prior
to the sixtieth (60th) calendar day after the date hereof for the registration
of Registrable Securities pursuant to Section 2(a)) and use its best efforts to
cause such Registration Statement relating to the Registrable Securities to
become effective as soon as possible after such filing (but in no event later
than one-hundred twenty (120) calendar days after the date hereof for the
registration of Registrable Securities pursuant to Section 2(a)), and keep such
Registration Statement effective pursuant to Rule 415 at all times until the
earlier of (i) the second (2nd) annual anniversary of the date of this Agreement
or (ii) the date on which the Investors shall have sold all the Registrable
Securities (the "Registration Period"), which Registration Statement (including
any amendments or supplements thereto and prospectuses contained therein) shall
not contain any untrue statement of a material fact or omit to state a material
fact required to be stated therein, or necessary to make the statements therein,
in light of the circumstances in which they were made, not misleading.

                                        4
<PAGE>

     b. Amendments. The Company shall prepare and file with the SEC such
amendments (including post-effective amendments) and supplements to a
Registration Statement and the prospectus used in connection with such
Registration Statement, which prospectus is to be filed pursuant to Rule 424
promulgated under the 1933 Act, as may be necessary to keep such Registration
Statement effective at all times during the Registration Period, and, during
such period, comply with the provisions of the 1933 Act with respect to the
disposition of all Registrable Securities of the Company covered by such
Registration Statement until such time as all of such Registrable Securities
shall have been disposed of in accordance with the intended methods of
disposition by the seller or sellers thereof as set forth in such Registration
Statement.

     c. Legal Counsel Review. The Company shall permit Legal Counsel to review
and comment upon a Registration Statement and all amendments and supplements
thereto at least seven (7) days prior to their filing with the SEC or promptly
following an Investor's notice to the Company that has selected Legal Counsel,
whichever is later, and shall not file any document in a form to which Legal
Counsel reasonably objects. The Company shall not submit a request for
acceleration of the effectiveness of a Registration Statement or any amendment
or supplement thereto without the prior approval of Legal Counsel, which consent
shall not be unreasonably withheld. The Company shall furnish to Legal Counsel,
without charge, (i) any correspondence from the SEC or the staff of the SEC to
the Company or its representatives relating to any Registration Statement, (ii)
promptly after the same is prepared and filed with the SEC, one copy of any
Registration Statement and any amendment(s) thereto, including financial
statements and schedules, all documents incorporated therein by reference and
all exhibits and (iii) upon the effectiveness of any Registration Statement, one
copy of the prospectus included in such Registration Statement and all
amendments and supplements thereto.

     d. Disclosure Materials. The Company shall furnish to each Investor whose
Registrable Securities are included in any Registration Statement, without
charge, (i) promptly after the same is prepared and filed with the SEC, at least
one copy of such Registration Statement and any amendment(s) thereto, including
financial statements and schedules, all documents incorporated therein by
reference and all exhibits, (ii) upon the effectiveness of any Registration
Statement, ten (10) copies of the prospectus included in such Registration
Statement and all amendments and supplements thereto (or such other number of
copies as such Investor may reasonably request) and (iii) such other documents,
including copies of any preliminary or final prospectus, as such Investor may
reasonably request from time to time in order to facilitate the disposition of
the Registrable Securities owned by such Investor.

     e. State Securities Laws. The Company shall use reasonable efforts to (i)
register and qualify the Registrable Securities covered by a Registration
Statement under such other securities or "blue sky" laws of such jurisdictions
in the United States as Legal Counsel or any Investor reasonably requests, (ii)
prepare and file in those jurisdictions, such amendments (including
post-effective amendments) and supplements to such registrations and
qualifications as may be necessary to maintain the effectiveness thereof during
the Registration Period, (iii) take such other actions as may be necessary to
maintain such registrations and qualifications in effect at all times during the
Registration Period, and (iv) take all other actions reasonably necessary or
advisable to qualify the Registrable Securities for sale in such jurisdictions;
provided, however, that the Company

                                       5
<PAGE>

shall not be required in connection therewith or as a condition thereto to (x)
qualify to do business in any jurisdiction where it would not otherwise be
required to qualify but for this Section 3(e), (y) subject itself to general
taxation in any such jurisdiction, or (z) file a general consent to service of
process in any such jurisdiction. The Company shall promptly notify Legal
Counsel and each Investor who holds Registrable Securities of the receipt by the
Company of any notification with respect to the suspension of the registration
or qualification of any of the Registrable Securities for sale under the
securities or "blue sky" laws of any jurisdiction in the United States or its
receipt of actual notice of the initiation or threatening of any proceeding for
such purpose.

     f. Underwriting Agreement. In the event Investors who hold a majority of
the Registrable Securities being offered in the offering select underwriters for
the offering, the Company shall enter into and perform its obligations under an
underwriting agreement, in usual and customary form, including, without
limitation, customary indemnification and contribution obligations, with the
underwriters of such offering.

     g. Notification. As promptly as practicable after becoming aware of such
event, the Company shall notify Legal Counsel and each Investor in writing of
the happening of any event as a result of which the prospectus included in a
Registration Statement, as then in effect, includes an untrue statement of a
material fact or omission to state a material fact required to be stated therein
or necessary to make the statements therein, in light of the circumstances under
which they were made, not misleading, and promptly prepare a supplement or
amendment to such Registration Statement to correct such untrue statement or
omission, and deliver ten (10) copies of such supplement or amendment to Legal
Counsel and each Investor (or such other number of copies as Legal Counsel or
such Investor may reasonably request). The Company shall also promptly notify
Legal Counsel and each Investor in writing (i) when a prospectus or any
prospectus supplement or post-effective amendment has been filed, and when a
Registration Statement or any post-effective amendment has become effective
(notification of such effectiveness shall be delivered to Legal Counsel and each
Investor by facsimile on the same day of such effectiveness and by overnight
mail), (ii) of any request by the SEC for amendments or supplements to a
Registration Statement or related prospectus or related information, and (iii)
of the Company's reasonable determination that a post-effective amendment to a
Registration Statement would be appropriate.

     h. Stop-Order and Suspension. The Company shall use its best efforts to
prevent the issuance of any stop order or other suspension of effectiveness of a
Registration Statement, or the suspension of the qualification of any of the
Registrable Securities for sale in any jurisdiction and, if such an order or
suspension is issued, to obtain the withdrawal of such order or suspension at
the earliest possible moment and to notify Legal Counsel and each Investor who
holds Registrable Securities being sold (and, in the event of an underwritten
offering, the managing underwriters) of the issuance of such order and the
resolution thereof or its receipt of actual notice of the initiation or threat
of any proceeding for such purpose.

     i. Requested Information. At the request of any Investor, the Company shall
furnish to such Investor, on the date of the effectiveness of the Registration
Statement and thereafter from time to time on such dates as an Investor may
reasonably request (i) if required by an underwriter, a letter, dated such date,
from the Company's independent certified public accountants

                                       6
<PAGE>

in form and substance as is customarily given by independent certified public
accountants to underwriters in an underwritten public offering, addressed to the
underwriters, and (ii) an opinion, dated as of such date, of counsel
representing the Company for purposes of such Registration Statement, in form,
scope and substance as is customarily given in an underwritten public offering,
addressed to the underwriters and the Investors.

     j. Inspection. The Company shall make available for inspection by (i) any
Investor, (ii) Legal Counsel, (iii) any underwriter participating in any
disposition pursuant to a Registration Statement, (iv) one firm of accountants
or other agents retained by the Investors, and (v) one firm of attorneys
retained by such underwriters (collectively, the "Inspectors") all pertinent
financial and other records, and pertinent corporate documents and properties of
the Company (collectively, the "Records"), as shall be reasonably deemed
necessary by each Inspector, and cause the Company's officers, directors and
employees to supply all information which any Inspector may reasonably request;
provided, however, that each Inspector shall hold in strict confidence and shall
not make any disclosure (except to an Investor) or use of any Record or other
information which the Company determines in good faith to be confidential, and
of which determination the Inspectors are so notified, unless (a) the disclosure
of such Records is necessary to avoid or correct a misstatement or omission in
any Registration Statement or is otherwise required under the 1933 Act, (b) the
release of such Records is ordered pursuant to a final, non-appealable subpoena
or order from a court or government body of competent jurisdiction, or (c) the
information in such Records has been made generally available to the public
other than by disclosure in violation of this or any other agreement of which
the Inspector has knowledge. Each Investor agrees that it shall, upon learning
that disclosure of such Records is sought in or by a court or governmental body
of competent jurisdiction or through other means, give prompt notice to the
Company and allow the Company, at its expense, to undertake appropriate action
to prevent disclosure of, or to obtain a protective order for, the Records
deemed confidential.

     k. Confidential Information. The Company shall hold in confidence and not
make any disclosure of information concerning an Investor provided to the
Company unless (i) disclosure of such information is necessary to comply with
federal or state securities laws, (ii) the disclosure of such information is
necessary to avoid or correct a misstatement or omission in any Registration
Statement, (iii) the release of such information is ordered pursuant to a
subpoena or other final, non-appealable order from a court or governmental body
of competent jurisdiction, or (iv) such information has been made generally
available to the public other than by disclosure in violation of this Agreement
or any other agreement of which the Company has knowledge. The Company agrees
that it shall, upon learning that disclosure of such information concerning an
Investor is sought in or by a court or governmental body of competent
jurisdiction or through other means, give prompt written notice to such Investor
and allow such Investor, at the Investor's expense, to undertake appropriate
action to prevent disclosure of, or to obtain a protective order for, such
information.

     l. Listing. The Company shall use its best efforts either to (i) cause all
the Registrable Securities covered by a Registration Statement to be listed on
each securities exchange on which securities of the same class or series issued
by the Company are then listed, if any, if the listing of such Registrable
Securities is then permitted under the rules of such exchange, or (ii)

                                       7
<PAGE>

secure designation and quotation of all the Registrable Securities covered by
the Registration Statement on the Nasdaq Stock Market. The Company shall pay all
fees and expenses in connection with satisfying its obligation under this
Section 3(l).

     m. [Reserved.]

     n. Transfer Agent. The Company shall provide a transfer agent and registrar
of all such Registrable Securities not later than the effective date of such
Registration Statement.

     o. Underwriter Requests. If requested by the managing underwriters or an
Investor, the Company shall (i) immediately incorporate in a prospectus
supplement or post-effective amendment such information as the managing
underwriters and the Investors agree should be included therein relating to the
sale and distribution of Registrable Securities, including, without limitation,
information with respect to the number of Registrable Securities being sold to
such underwriters, the purchase price being paid therefor by such underwriters
and any other terms of the underwritten (or best efforts underwritten) offering
of the Registrable Securities to be sold in such offering; (ii) make all
required filings of such prospectus supplement or post-effective amendment as
soon as notified of the matters to be incorporated in such prospectus supplement
or post-effective amendment; and (iii) supplement or make amendments to any
Registration Statement if requested by a shareholder or any underwriter of such
Registrable Securities.

     p. [Reserved.]

     q. [Reserved.]

     r. 1934 Act Compliance. The Company shall otherwise use its best efforts to
comply with all applicable rules and regulations of the SEC in connection with
any registration hereunder and the Company shall use its best efforts to file
with the SEC in a timely manner all reports and documents required of the
Company under the 1933 Act and the 1934 Act (as defined in Section 6(a)).

     s. Confirmation. Within two (2) business days after the Registration
Statement which includes the Registrable Securities is ordered effective by the
SEC, the Company shall deliver, and shall cause legal counsel for the Company to
deliver, to the transfer agent for such Registrable Securities (with copies to
the Investors whose Registrable Securities are included in such Registration
Statement) confirmation that the Registration Statement has been declared
effective by the SEC in the form attached hereto as Exhibit A.

     t. [Reserved.]

     u. Disposition. The Company shall take all other reasonable actions
necessary to expedite and facilitate disposition by the Investors of Registrable
Securities pursuant to a Registration Statement.

                                       8
<PAGE>

     v. Limitation on Registration Statement. Notwithstanding anything to the
contrary contained in this Agreement, except to comply with the rights of
Ladenburg Thalmann & Co. as set forth in that certain investment banking
agreement with the Company dated April 11, 2000 (the "Investment Banking
Agreement") and the rights of any investor contemplated by the Investment
Banking Agreement, the Registration Statement shall register only the
Registrable Securities and the Company common stock and common shares underlying
the warrants purchased by the Other Purchasers (as defined in the Securities
Purchase Agreement) pursuant to the Offering (as defined in the Securities
Purchase Agreement).

     4. OBLIGATIONS OF THE INVESTORS.

     a. At least seven (7) days prior to the first anticipated filing date of
the Registration Statement, the Company shall notify each Investor in writing of
the information the Company requires from each such Investor if such Investor
elects to have any of such Investor's Registrable Securities included in such
Registration Statement. It shall be a condition precedent to the obligations of
the Company to complete the registration pursuant to this Agreement with respect
to the Registrable Securities of a particular Investor that such Investor shall
furnish to the Company such information regarding itself and the Registrable
Securities held by it as shall be reasonably required to effect the registration
of such Registrable Securities and shall execute such documents in connection
with such registration as the Company may reasonably request.

     b. Each Investor by such Investor's acceptance of the Registrable
Securities agrees to cooperate with the Company as reasonably requested by the
Company in connection with the preparation and filing of any Registration
Statement hereunder, unless such Investor has notified the Company in writing of
such Investor's election to exclude all of such Investor's Registrable
Securities from such Registration Statement.

     c. In the event any Investor elects to participate in an underwritten
public offering pursuant to Section 2, each such Investor agrees to enter into
and perform such Investor's obligations under an underwriting agreement, in
usual and customary form, including, without limitation, customary
indemnification and contribution obligations, with the managing underwriter of
such offering and take such other actions as are reasonably required in order to
expedite or facilitate the disposition of the Registrable Securities.

     d. Each Investor is aware of the prohibitions against certain market
activities by participants in a distribution of securities that are contained in
Regulation M ("Regulation M") promulgated under the Securities Exchange Act of
1934, as amended (the "1934 Act"). Each Investor understands that the resale of
Registrable Securities pursuant to the Registration Statement may constitute a
distribution of such securities, within the meaning of Regulation M, depending
upon the amount of Registrable Securities offered for resale and whether or not
special selling efforts and methods are used in connection with such resales.
Each Investor agrees to avoid any market activity proscribed by Regulation M,
and consents to the Company's suspension of such Investor's rights under Section
2(u) above at any time that resales of Registrable Securities by such Investor
are or then would be in violation of Regulation M.

                                       9
<PAGE>

     5. EXPENSES OF REGISTRATION.

     All reasonable expenses, other than underwriting discounts and commissions,
incurred in connection with registrations, filings or qualifications pursuant to
Sections 2 and 3, including, without limitation, all registration, listing and
qualifications fees, printers and accounting fees, and fees and disbursements of
counsel for the Company and, in the event the Company fails to comply with the
reasonable requests of Legal Counsel made pursuant to Section 3(c) of this
Agreement, the fees and disbursements of Legal Counsel, shall be paid by the
Company.

     6. INDEMNIFICATION.

     In the event any Registrable Securities are included in a Registration
Statement under this Agreement:

     a. To the fullest extent permitted by law, the Company will, and hereby
does, indemnify, hold harmless and defend each Investor who holds such
Registrable Securities, the directors, officers, partners, employees, agents,
representatives of, and each Person, if any, who controls any Investor within
the meaning of the 1933 Act or the 1934 Act, and any underwriter (as defined in
the 1933 Act) for the Investors, and the directors and officers of, and each
Person, if any, who controls, any such underwriter within the meaning of the
1933 Act or the 1934 Act (each, an "Indemnified Person"), subject to Section
6(d) below, against any losses, claims, damages, liabilities, judgments, fines,
penalties, charges, costs, attorneys' fees, amounts paid in settlement or
expenses, joint or several, (collectively, "Indemnified Damages") incurred in
investigating, preparing or defending any action, claim, suit, inquiry,
proceeding, investigation or appeal taken from the foregoing by or before any
court or governmental, administrative or other regulatory agency, body or the
SEC, whether pending or threatened, whether or not an indemnified party is or
may be a party thereto ("Claims"), to which any of them may become subject
insofar as such Claims (or actions or proceedings, whether commenced or
threatened, in respect thereof) arise out of or are based upon: (i) any untrue
statement or alleged untrue statement of a material fact in a Registration
Statement or any post-effective amendment thereto or in any filing made in
connection with the qualification of the offering under the securities or other
"blue sky" laws of any jurisdiction in which Registrable Securities are offered
("Blue Sky Filing"), or the omission or alleged omission to state a material
fact required to be stated therein or necessary to make the statements therein
not misleading, (ii) any untrue statement or alleged untrue statement of a
material fact contained in any preliminary prospectus if used prior to the
effective date of such Registration Statement, or contained in the final
prospectus (as amended or supplemented, if the Company files any amendment
thereof or supplement thereto with the SEC) or the omission or alleged omission
to state therein any material fact necessary to make the statements made
therein, in light of the circumstances under which the statements therein were
made, not misleading, (iii) any violation or alleged violation by the Company of
the 1933 Act, the 1934 Act, any other law, including, without limitation, any
state securities law, or any rule or regulation thereunder relating to the offer
or sale of the Registrable Securities pursuant to a Registration Statement or
(iv) any material violation of this Agreement (the matters in the foregoing
clauses (i) through (iv) being, collectively, "Violations"). The Company shall
reimburse the Investors and each such underwriter or controlling person,
promptly as such expenses are incurred and are due and payable, for any legal
fees or other reasonable expenses incurred by them

                                       10
<PAGE>

in connection with investigating or defending any such Claim. Notwithstanding
anything to the contrary contained herein, the indemnification agreement
contained in this Section 6(a): (i) shall not apply to a Claim by an Indemnified
Person arising out of or based upon a Violation which occurs in reliance upon
and in conformity with information furnished in writing to the Company by such
Indemnified Person or underwriter for such Indemnified Person expressly for use
in connection with the preparation of the Registration Statement or any such
amendment thereof or supplement thereto, if such prospectus was timely made
available by the Company pursuant to Section 3(d); (ii) with respect to any
preliminary prospectus, shall not inure to the benefit of any such person from
whom the person asserting any such Claim purchased the Registrable Securities
that are the subject thereof (or to the benefit of any person controlling such
person) if the untrue statement or omission of material fact contained in the
preliminary prospectus was corrected in the prospectus, as then amended or
supplemented, if such prospectus was timely made available by the Company
pursuant to Section 3(d), and the Indemnified Person was promptly advised in
writing not to use the incorrect prospectus prior to the use giving rise to a
violation and such Indemnified Person, notwithstanding such advice, used it;
(iii) shall not be available to the extent such Claim is based on a failure of
the Investor to deliver properly or to cause to be delivered properly the
prospectus made available by the Company, if such prospectus was timely made
available by the Company pursuant to Section 3(d); and (iv) shall not apply to
amounts paid in settlement of any Claim if such settlement is effected without
the prior written consent of the Company, which consent shall not be
unreasonably withheld. Such indemnity shall remain in full force and effect
regardless of any investigation made by or on behalf of the Indemnified Person
and shall survive the transfer of the Registrable Securities by the Investors
pursuant to Section 9.

     b. In connection with any Registration Statement in which an Investor is
participating, each such Investor agrees to severally and not jointly indemnify,
hold harmless and defend, to the same extent and in the same manner as is set
forth in Section 6(a), the Company, each of its directors, each of its officers
who signs the Registration Statement, each Person, if any, who controls the
Company within the meaning of the 1933 Act or the 1934 Act (collectively and
together with an Indemnified Person, an "Indemnified Party"), against any Claim
or Indemnified Damages to which any Indemnified Party may become subject, under
the 1933 Act, the 1934 Act or otherwise, insofar as such Claim or Indemnified
Damages arise out of or are based upon (i) any Violation, in each case to the
extent, and only to the extent, that such Violation occurs in reliance upon and
in conformity with written information furnished to the Company by such Investor
expressly for use in connection with such Registration Statement, and (ii) any
Violation, in each case to the extent and only to the extent that such Violation
occurs as a result of the failure of an Investor to deliver properly or to cause
to be delivered properly the prospectus made available by the Company, if such
prospectus was timely made available by the Company pursuant to Section 3(d);
and, subject to Section 6(d), such Investor will reimburse any legal or other
expenses reasonably incurred by them in connection with investigating or
defending any such Claim; provided, however, that the indemnity agreement
contained in this Section 6(b) and the agreement with respect to contribution
contained in Section 7 shall not apply to amounts paid in settlement of any
Claim if such settlement is effected without the prior written consent of such
Investor, which consent shall not be unreasonably withheld; provided, further,
however, that the Investor shall be liable under this Section 6(b) for only that
amount of a Claim or Indemnified Damages as does not exceed the net proceeds to
such Investor as a result of the sale of Registrable Securities pursuant to such
Registration Statement. Such

                                       11
<PAGE>

indemnity shall remain in full force and effect regardless of any investigation
made by or on behalf of such Indemnified Party and shall survive the transfer of
the Registrable Securities by the Investors pursuant to Section 9.
Notwithstanding anything to the contrary contained herein, the indemnification
agreement contained in this Section 6(b) with respect to any preliminary
prospectus shall not inure to the benefit of any Indemnified Party if the untrue
statement or omission of material fact contained in the preliminary prospectus
was corrected on a timely basis in the prospectus, as then amended or
supplemented.

     c. The Company shall be entitled to receive indemnities from underwriters,
selling brokers, dealer managers and similar securities industry professionals
participating in any distribution, to the same extent as provided above, with
respect to information such persons so furnished in writing expressly for
inclusion in the Registration Statement.

     d. Promptly after receipt by an Indemnified Person or Indemnified Party
under this Section 6 of notice of the commencement of any action or proceeding
(including any governmental action or proceeding) involving a Claim, such
Indemnified Person or Indemnified Party shall, if a Claim in respect thereof is
to be made against any indemnifying party under this Section 6, 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 control of the defense thereof with counsel
mutually satisfactory to the indemnifying party and the Indemnified Person or
the Indemnified Party, as the case may be; provided, however, that an
Indemnified Person or Indemnified Party shall have the right to retain its own
counsel with the fees and expenses to be paid by the indemnifying party, if, in
the reasonable opinion of counsel retained by the indemnifying party, the
representation by such counsel of the Indemnified Person or Indemnified Party
and the indemnifying party would be inappropriate due to actual or potential
differing interests between such Indemnified Person or Indemnified Party and any
other party represented by such counsel in such proceeding. The Company shall
pay reasonable fees for only one separate legal counsel for the Investors, and
such legal counsel shall be selected by the Investors holding a majority in
interest of the Registrable Securities included in the Registration Statement to
which the Claim relates. The Indemnified Party or Indemnified Person shall
cooperate fully with the indemnifying party in connection with any negotiation
or defense of any such action or claim by the indemnifying party and shall
furnish to the indemnifying party all information reasonably available to the
Indemnified Party or Indemnified Person which relates to such action or claim.
The indemnifying party shall keep the Indemnified Party or Indemnified Person
fully apprized at all times as to the status of the defense or any settlement
negotiations with respect thereto. No indemnifying party shall be liable for any
settlement of any action, claim or proceeding effected without its written
consent, provided, however, that the indemnifying party shall not unreasonably
withhold, delay or condition its consent. No indemnifying party shall, without
the consent of the Indemnified Party or Indemnified Person, consent to entry of
any judgment or enter into any settlement or other compromise which does not
include as an unconditional term thereof the giving by the claimant or plaintiff
to such Indemnified Party or Indemnified Person of a release from all liability
in respect to such claim or litigation. Following indemnification as provided
for hereunder, the indemnifying party shall be subrogated to all rights of the
Indemnified Party or Indemnified Person with respect to all third parties, firms
or corporations relating to the matter for which indemnification has been made.
The failure to deliver

                                       12
<PAGE>

written notice to the indemnifying party within a reasonable time of the
commencement of any such action shall not relieve such indemnifying party of any
liability to the Indemnified Person or Indemnified Party under this Section 6,
except to the extent that the indemnifying party is prejudiced in its ability to
defend such action.

     e. The indemnification required by this Section 6 shall be made by periodic
payments of the amount thereof during the course of the investigation or
defense, as and when bills are received or Indemnified Damages are incurred.

     f. The indemnity agreements contained herein shall be in addition to (i)
any cause of action or similar right of the Indemnified Party or Indemnified
Person against the indemnifying party or others, and (ii) any liabilities the
indemnifying party may be subject to pursuant to the law.

     7. CONTRIBUTION.

     To the extent any indemnification by an indemnifying party is prohibited or
limited by law, the indemnifying party agrees to make the maximum contribution
with respect to any amounts for which it would otherwise be liable under Section
6 to the fullest extent permitted by law; provided, however, that: (i) no seller
of Registrable Securities guilty of fraudulent misrepresentation (within the
meaning of Section 11(f) of the 1933 Act) shall be entitled to contribution from
any seller of Registrable Securities who was not guilty of fraudulent
misrepresentation; and (ii) contribution by any seller of Registrable Securities
shall be limited in amount to the net amount of proceeds received by such seller
from the sale of such Registrable Securities.

     8. LIQUIDATED DAMAGES.

     a. The Company agrees that an Investor will suffer damages if the Company
violates any provision of or fails to fulfill its obligations pursuant to
Sections 2(a), 2(b), 2(g), 3(a), 3(b), 3(e), 3(h), 3(l) and 3(v) of this
Agreement (a "Registration Default") and that it would not be possible to
ascertain the extent of such damages. Accordingly, in the event of such
Registration Default, the Company hereby agrees to pay liquidated damages
("Liquidated Damages") to such Investor following the occurrence of such
Registration Default in an amount determined by multiplying (i) $0.12 per Common
Share then held by such Investor by (ii) the percentage derived by dividing (A)
the actual number of days elapsed from the first day of the date that an uncured
Registration Default occurred or the end of the prior 30-day period, as
applicable, to the day all Registration Defaults have been completely cured, by
(B) thirty (30). Liquidated Damages shall be paid in cash, or at the Buyer's
option, in the number of shares of Company common stock equal to the quotient of
(v) the dollar amount of the Liquidated Damages due on the Payment Date (as
defined below) divided by (w) the closing bid price of the Company's common
stock (as quoted in the Principal Market or the market or exchange where the
Company's common stock is then traded) as of the first day that an uncured
Registration Default occurred. The Liquidated Damages payable pursuant hereto
shall be payable within five (5) business days from the end of the 30-day period
commencing on the first 30-day period in which the Registration Default occurs
(each, a "Payment

                                       13
<PAGE>

Date"). In the event the Liquidated Damages are paid in shares of Company common
stock, such shares shall also be considered Common Shares and shall have the
registration rights set forth in this Agreement. Notwithstanding anything to the
contrary herein, (a) in no event shall the Company issue shares of common stock
pursuant to this Section 8 which, when added to other Registrable Securities
purchased by Buyers pursuant to the Securities Purchase Agreement, would (i)
result in a change of control of the Company, or (ii) represent 20% or more of
the total number of shares of common stock or voting power of the Company
outstanding immediately prior to the Closing Date (defined in the Securities
Purchase Agreement).

     b. Notwithstanding anything to the contrary in Section 8(a) above:

          (i) the Company shall have the right to pay Liquidated Damages in cash
     irrespective of any Investor's election to receive shares of Company Common
     Stock in settlement thereof if the closing bid price of the Company's
     Common Stock as determined under clause (w) above is less than $6.00 per
     share.

          (ii) in the event of a Registration Default under Section 2(g),
     Liquidated Damages shall be payable in an amount determined by multiplying
     (A) the amount of Liquidated Damages as calculated by Section 8(a) above,
     by (B) a fraction, the numerator of which fraction shall be the total
     number of Common Shares held by the Investor or which the Investor is
     entitled to receive and which have not been registered under the
     Registration Statement, and the denominator of which fraction shall be the
     total number of Common Shares held by the Investor and which the Investor
     is entitled to receive.

          (iii) no Registration Default shall be deemed to have occurred
     hereunder:

               (A) (1) under Section 2(g) if the Deficit Failure is the result
          of a merger or other reorganization requiring the amendment of the
          Registration Statement involving the restatement or filing of
          additional or restated financial statements, provided, however, that
          the Company diligently proceeds and utilizes its best efforts to
          satisfy its obligations under Section 3(b) and Section 2(g) of this
          Agreement, or (2) in the event that, pursuant to Section 2(g) of this
          Agreement, the Company has reserved and registered for resale the
          Common Shares purchased by the Buyers pursuant to the Securities
          Purchase Agreement, under Section 2(g) if the Deficit Failure is the
          result of a failure to register a number of Common Shares which
          represent 5% or less of the additional number of Common Shares issued
          to such Investor pursuant to this Agreement or the Securities Purchase
          Agreement in excess of such Common Shares purchased by the Buyers,
          provided, however, that the Company diligently proceeds and utilizes
          its best efforts to satisfy its obligations under Section 2(g) of this
          Agreement.

               (B) under Section 3(a) or Section 3(b) for failing to keep the
          Registration Statement effective at all times if such failure is due
          to a merger or other acquisition or reorganization, a recapitalization
          involving the filing of new or restating of previously filed financial
          statements, or other material corporate developments involving any
          entity or business engaged in the same industry or business of the
          Company, provided, however, that the Company proceeds diligently

                                       14
<PAGE>

          and utilizes its best efforts to satisfy its obligations under
          Section 3(a) or Section 3(b) of this Agreement.

               (C) under Section 3(h) in respect of any suspension of
          effectiveness or withdrawal of the Registration Statement, or stop
          order relating thereto, or suspension of sales under the Registration
          Statement pending the filing and effectiveness of a post-effective
          amendment to the Registration Statement that is made necessary by a
          merger or other acquisition or reorganization, a recapitalization
          involving the filing of new or restating of previously filed financial
          statements, or other material corporate developments involving any
          entity or business engaged in the same industry or business of the
          Company, provided, however, that the Company proceeds diligently and
          utilizes its best efforts to satisfy its obligations under Section
          3(h) of this Agreement.

     9. ASSIGNMENT OF REGISTRATION RIGHTS.

     The rights under this Agreement shall be automatically assignable by the
Investors to any transferee of all or any portion of Registrable Securities if:
(i) the Investor agrees in writing with the transferee or assignee to assign
such rights, and a copy of such agreement is furnished to the Company within a
reasonable time after such assignment; (ii) the Company is, within a reasonable
time after such transfer or assignment, furnished with written notice of (a) the
name and address of such transferee or assignee, and (b) the securities with
respect to which such registration rights are being transferred or assigned;
(iii) immediately following such transfer or assignment the further disposition
of such securities by the transferee or assignee is restricted under the 1933
Act and applicable state securities laws; provided, however, that the transferee
or assignee may subsequently transfer or assign all or any portion of the
Registrable Securities if an exemption from registration under the 1933 Act is
applicable to such transfer or assignment; (iv) at or before the time the
Company receives the written notice contemplated by clause (ii) of this sentence
the transferee or assignee agrees in writing with the Company to be bound by all
of the provisions contained herein; and (v) such transfer shall have been made
in accordance with the applicable requirements of the Securities Purchase
Agreement.

                                       15
<PAGE>

     10. AMENDMENT OF REGISTRATION RIGHTS.

     Provisions of this Agreement may be amended and the observance thereof may
be waived (either generally or in a particular instance and either retroactively
or prospectively), only with the written consent of the Company and Investors
who then hold two-thirds (2/3) of the Registrable Securities. Any amendment or
waiver effected in accordance with this Section 10 shall be binding upon each
Investor and the Company. No such amendment shall be effective to the extent
that it applies to less than all of the holders of the Registrable Securities.
No consideration shall be offered or paid to any Person to amend or consent to a
waiver or modification of any provision of any of this Agreement unless the same
consideration also is offered to all of the parties to this Agreement.

     11. MISCELLANEOUS.

     a. A Person is deemed to be a holder of Registrable Securities whenever
such Person owns or is deemed to own of record such Registrable Securities. If
the Company receives conflicting instructions, notices or elections from two or
more Persons with respect to the same Registrable Securities, the Company shall
act upon the basis of instructions, notice or election received from the
registered owner of such Registrable Securities.

     b. Any notices, consents, waivers or other communications required or
permitted to be given under the terms of this Agreement must be in writing and
will be deemed to have been delivered: (i) upon receipt, when delivered
personally; (ii) upon receipt, when sent by facsimile (provided confirmation of
transmission is mechanically or electronically generated and kept on file by the
sending party); or (iii) one business day after deposit with a nationally
recognized overnight delivery service, in each case properly addressed to the
party to receive the same. The addresses and facsimile numbers for such
communications shall be as set forth below or at such other address and/or
facsimile number and/or to the attention of such other person as the recipient
party has specified by written notice given to each other party five days prior
to the effectiveness of such change:

                  If to the Company:

                           Generex Biotechnology Corporation
                           33 Harbour Square, Suite 202
                           Toronto, Canada M5J 2G2
                           Telephone: (416) 364-2551
                           Facsimile:  (416) 364-9363
                           Attention: E.  Mark Perri

                                       16
<PAGE>

                  With a copy to:

                           Eckert Seamans Cherin & Mellott
                           1515 Market Street, 9th Floor
                           Philadelphia, Pennsylvania 19102-1909
                           Telephone: (215)851-8400
                           Facsimile: (215) 851-8383
                           Attention: Joseph Chicco, Esq.

                  If to a Buyer: to it at the address and facsimile number set
                           forth on the Schedule of Buyers attached hereto, with
                           copies to such Buyer's representatives as set forth
                           on the Schedule of Buyers.

     c. Failure of any party to exercise any right or remedy under this
Agreement or otherwise, or delay by a party in exercising such right or remedy,
shall not operate as a waiver thereof.

     d. This Agreement shall be governed by and construed in all respects by the
internal laws of the State of Illinois (except for the proper application of the
United States federal securities laws), without giving effect to any choice of
law or conflict of law provision or rule (whether of the State of Illinois or
any other jurisdictions) that would cause the application of the laws of any
jurisdictions other than the State of Illinois. Each party hereby irrevocably
submits to the non-exclusive jurisdiction of the state and federal courts
sitting the City of Chicago, for the adjudication of any dispute hereunder. If
any provision of this Agreement shall be invalid or unenforceable in any
jurisdiction, such invalidity or unenforceability shall not affect the validity
or enforceability of the remainder of this Agreement in that jurisdiction or the
validity or enforceability of any provision of this Agreement in any other
jurisdiction.

     e. This Agreement, the Securities Purchase Agreement and the Warrants
constitute the entire agreement among the parties hereto with respect to the
subject matter hereof and thereof. There are no restrictions, promises,
warranties or undertakings, other than those set forth or referred to herein and
therein. This Agreement, the Securities Purchase Agreement and the Warrants
supersede all prior agreements and understandings among the parties hereto with
respect to the subject matter hereof and thereof.

     f. Subject to the requirements of Section 9, this Agreement shall inure to
the benefit of and be binding upon the permitted successors and assigns of each
of the parties hereto.

     g. The headings in this Agreement are for convenience of reference only and
shall not limit or otherwise affect the meaning hereof.

     h. This Agreement may be executed in identical counterparts, each of which
shall be deemed an original but all of which shall constitute one and the same
agreement. This Agreement, once executed by a party, may be delivered to the
other party hereto by facsimile

                                       17
<PAGE>

transmission of a copy of this Agreement bearing the signature of the party so
delivering this Agreement.

     i. Each party shall do and perform, or cause to be done and
performed, all such further acts and things, and shall execute and deliver all
such other agreements, certificates, instruments and documents, as the other
party may reasonably request in order to carry out the intent and accomplish the
purposes of this Agreement and the consummation of the transactions contemplated
hereby.

     j. All consents and other determinations to be made by the Investors
pursuant to this Agreement shall be made, unless otherwise specified in this
Agreement, by Investors holding a majority of the Registrable Securities.

     k. The language used in this Agreement will be deemed to be the language
chosen by the parties to express their mutual intent and no rules of strict
construction will be applied against any party.

     l. This Agreement is intended for the benefit of the parties hereto and
their respective permitted successors and assigns, and is not for the benefit
of, nor may any provision hereof be enforced by, any other Person.

     IN WITNESS WHEREOF, the parties have caused this Registration Rights
Agreement to be duly executed as of day and year first above written.

GENEREX BIOTECHNOLOGY CORPORATION

By:
    ------------------------------
Name:
     -----------------------------
Title:
      ----------------------------

BUYERS:

By:
   -------------------------------
Name:
     -----------------------------
Title:
       ---------------------------

                                       18

<PAGE>
                               SCHEDULE OF BUYERS

                                                     Buyer's Address
            Buyer's Name                          and Facsimile Number
            ------------                          --------------------

                                       19

<PAGE>

                                                                       EXHIBIT A
                         FORM OF NOTICE OF EFFECTIVENESS
                            OF REGISTRATION STATEMENT

[TRANSFER AGENT]
Attn:
     ----------------------

            Re: GENEREX BIOTECHNOLOGY CORPORATION

Ladies and Gentlemen:

     We are counsel to Generex Biotechnology Corporation, a Delaware corporation
(the "Company"), and have represented the Company in connection with that
certain Securities Purchase Agreement (the "Purchase Agreement") entered into by
and among the Company and the buyers named therein (collectively, the "Holders")
pursuant to which the Company issued to the Holders shares of its Common Stock,
par value $.001 per share, (the "Common Shares") and the Warrants (the
Warrants). Pursuant to the Purchase Agreement, the Company also has entered into
a Registration Rights Agreement with the Holders (the "Registration Rights
Agreement") pursuant to which the Company agreed, among other things, to
register the Registrable Securities (as defined in the Registration Rights
Agreement), including the Common Shares, under the Securities Act of 1933, as
amended (the "1933 Act"). In connection with the Company's obligations under the
Registration Rights Agreement, on__________________, the Company filed a
Registration Statement on Form S-3 (File No. _____________) (the "Registration
Statement") with the Securities and Exchange Commission (the "SEC") relating to
the Registrable Securities which names each of the Holders as a selling
stockholder thereunder.

     In connection with the foregoing, we advise you that a member of the SEC's
staff has advised us by telephone that the SEC has entered an order declaring
the Registration Statement effective under the 1933 Act at [ENTER TIME OF
EFFECTIVENESS] on [ENTER DATE OF EFFECTIVENESS] and we have no knowledge, after
telephonic inquiry of a member of the SEC's staff, that any stop order
suspending its effectiveness has been issued or that any proceedings for that
purpose are pending before, or threatened by, the SEC and the Registrable
Securities are available for resale under the 1933 Act pursuant to the
Registration Statement.

                                        Very truly yours,

                                        [ISSUER'S COUNSEL]

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

cc:  [LIST NAMES OF HOLDERS]

                                       20

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