SALIX PHARMACEUTICALS LTD
8-A12G, 1998-11-16
PHARMACEUTICAL PREPARATIONS
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<PAGE>   1
                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549


                                    FORM 8-A


                FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES
                     PURSUANT TO SECTION 12(b) OR (g) OF THE
                         SECURITIES EXCHANGE ACT OF 1934


                           SALIX PHARMACEUTICALS, LTD.
             (Exact name of Registrant as specified in its charter)


<TABLE>
<S>                                                                                  <C>       
                 BRITISH VIRGIN ISLANDS                                              94-3267443
(State or other jurisdiction of incorporation or organization)          (I.R.S. Employer Identification No.)
</TABLE>


                       3600 WEST BAYSHORE ROAD, SUITE 205
                           PALO ALTO, CALIFORNIA 94303
               (Address of principal executive offices) (Zip Code)



SECURITIES TO BE REGISTERED PURSUANT TO SECTION 12(B) OF THE ACT:

      TITLE OF EACH CLASS                        NAME OF EACH EXCHANGE ON WHICH
      TO BE SO REGISTERED                        EACH CLASS IS TO BE REGISTERED

             NONE                                              NONE

IF THIS FORM RELATES TO THE REGISTRATION OF A CLASS OF SECURITIES PURSUANT TO
SECTION 12(B) OF THE EXCHANGE ACT AND IS EFFECTIVE PURSUANT TO GENERAL
INSTRUCTION A.(C)(1), CHECK THE FOLLOWING BOX.  [ ]

IF THIS FORM RELATES TO THE REGISTRATION OF A CLASS OF SECURITIES PURSUANT TO
SECTION 12(G) OF THE EXCHANGE ACT AND IS EFFECTIVE PURSUANT TO GENERAL
INSTRUCTION A.(D), CHECK THE FOLLOWING BOX.  [X]

SECURITIES ACT REGISTRATION STATEMENT FILE NUMBER TO WHICH THIS FORM
RELATES:  NOT APPLICABLE.

SECURITIES TO BE REGISTERED PURSUANT TO SECTION 12(G) OF THE ACT:

                          COMMON SHARE PURCHASE RIGHTS
                                (Title of Class)


<PAGE>   2

Item 1.        Description of Securities to be Registered.

        The Board of Directors of Salix Pharmaceuticals, Ltd. (the "Company")
has declared a dividend of one common share purchase right (a "Right") for each
outstanding share of Common Stock, no par value (the "Common Shares") of the
Company. The dividend is payable on November 16, 1998 (the "Record Date") to
shareholders of record as of the close of business on that date. Each Right
entitles the registered holder to purchase from the Company one Common Share at
a price of (Cdn.)$60.00 (the "Exercise Price") (or the U.S. dollar equivalent
thereof), subject to adjustment. The description and terms of the Rights are set
forth in a Shareholder Protection Rights Agreement dated, November 16, 1998 (the
"Rights Agreement") between the Company and Montreal Trust Company of Canada as
Rights Agent (the "Rights Agent").

        The following is a general description only and is subject to the
detailed terms and conditions of the Rights Agreement. A copy of the Rights
Agreement, including the form of Rights Certificate and the Summary of Rights to
be provided to stockholders of the Company, is attached as Exhibit 1 to this
Registration Statement and is incorporated herein by reference.

Rights Evidenced by Common Share Certificates

        The Rights will not be exercisable until the Separation Time (defined
below). Certificates for the Rights ("Rights Certificates") will not be sent to
shareholders and the Rights will attach to and trade only together with the
Common Shares until the Separation Time. Accordingly, Common Share certificates
outstanding on the Record Date will evidence the rights related thereto, and
Common Share certificates issued after the Record Date will contain a notation
incorporating the Rights Agreement by reference. Until the Separation Time (or
earlier redemption, exchange or expiration of the Rights), the surrender or
transfer of any certificates for Common Shares issued after or outstanding as of
the Record Date, even without notation or a copy of the Summary of Rights being
attached thereto, will also constitute the transfer of the Rights associated
with the Common Shares represented by such certificate.

Separation Time

        The Rights will generally be exercisable and begin to trade separately
from the Common Shares at the close of business on the tenth day after the
earlier of:

               (A)    a public announcement by a person or a group of affiliated
                      or associated persons, including persons acting jointly or
                      in concert, (an "Acquiring Person") that it has acquired
                      beneficial ownership of 20% or more of the outstanding
                      Common Shares of the Company other than as a result of:

                             (1)    a reduction of the number of Common Shares
                                    of the Company outstanding;


                                      -2-
<PAGE>   3

                             (2)    a Permitted Bid or Competing Permitted Bid
                                    (as defined below); or

                             (3)    acquisitions of shares in respect of which
                                    the Board of Directors has waived the
                                    provisions of the Rights Plan; or

                             (4)    certain types of proportionate acquisitions;
                                    and

               (B)    the date of the commencement of, or the first public
                      announcement of the intent of any person to commence, a
                      bid which, if completed, would result in a person having
                      20% or more of the outstanding Common Shares of the
                      Company (other than a Permitted Bid or Competing Permitted
                      Bid, as defined in the Rights Agreement and described
                      below);

or such earlier or later date as may from time to time be determined by the
Board of Directors of the Company (the "Separation Time").

Issuance of Rights Certificates; Expiration of Rights

        Promptly following the Separation Time, separate Rights Certificates
will be mailed to holders of record of the Common Shares as of the close of
business on the Separation Time (other than an Acquiring Person and, in respect
of any Rights Beneficially Owned by such Acquiring Person which are not held of
record by such Acquiring Person, the holder of record of such Rights) and such
separate Rights Certificates alone will evidence the Rights from and after the
Separation Time. All Common Shares issued prior to the Separation Time will be
issued with Rights. The Rights will expire on November 16, 2003, subject to
earlier expiry in accordance with the provisions of the Rights Agreement (the
"Expiration Time"), unless the Expiration Time is extended or unless the Rights
are earlier redeemed or exchanged by the Company.

Exercise of Rights

        After the Separation Time, each Right will entitle the holder thereof to
acquire one Common Share upon payment of the Exercise Price. The Exercise Price
payable and the number of securities issuable upon the exercise of the Rights
are subject to adjustment from time to time to prevent dilution upon the
occurrence of certain corporate events affecting the Common Shares.

        Following a transaction that results in a person becoming an Acquiring
Person (a "Flip-in Event"), the Rights will entitle the holders to receive upon
exercise of the Rights, Common Shares with a market value equal to twice the
exercise price of the Rights, subject to the ability of the Board of Directors
of the Company to waive the application of the Rights Agreement to a particular
Flip-in Event and the ability of the Board of Directors of the Company to redeem
the Rights. The Rights Agreement contains standard and customary anti-dilution
provisions relating to the Rights. In such event, however,


                                      -3-
<PAGE>   4

any Rights beneficially owned by an Acquiring Person (including any affiliates,
associates, persons acting jointly or in concert and any direct or indirect
transferee of such person) will be void.

        If after the Rights have been triggered the Board of Directors
determines that the Rights Plan is inadequate protection for the holders of the
Rights, it may authorize the Company to issue or deliver, either in return for
the relevant exercise price or without charge, debt or equity or other
securities or assets (or a combination thereof) of the Company. This exchange
option preserves the economic benefit of the Rights by diluting the acquirer's
position and, in certain circumstances, would operate in a manner such that the
shareholders would not be required to actually invest funds to effect the
dilution.

        An acquisition of Common Shares that would otherwise make a person an
Acquiring Person will not trigger the Rights if the acquisition is pursuant to a
"Permitted Bid" or a "Competing Permitted Bid".

        To make a Permitted Bid, among other things, the offeror must make a bid
for all outstanding Common Shares of the Company and meeting certain conditions,
including the following requirements:

        (1)    the bid must be open for acceptance for not less than 90 days and
               permit deposited Shares to be withdrawn during such period;

        (2)    the offeror may only take-up and pay for shares deposited under
               the bid if more than 50% of the Voting Shares have been deposited
               under the bid and not withdrawn; and

        (3)    the offeror must make arrangements satisfactory to the Board for
               the deposit of shares arising on the exercise of employee
               options.

A Permitted Bid or Competing Permitted Bid must otherwise be made in compliance
with and not on a basis which is exempt from the provisions of the securities
legislation regarding takeover bids.

        A Competing Permitted Bid is a takeover bid that satisfies all of the
provisions of a Permitted Bid except that Common Shares may be taken up and paid
for under the Competing Permitted Bid on a date which is not earlier than the
later of 21 days after the date of the takeover bid or the earliest date the
Common Shares may be taken up and paid for under any other Permitted Bid then in
existence.

        Offer to All for All. Generally, the Permitted Bid definition requires
that the takeover bid be made for all of the Common Shares of the Company on the
same basis, rather than pursuant to the exemptions from the current applicable
legislative regime that would allow an offeror to acquire control of the Company
pursuant to one or more private agreements at a premium to the then current
market price without an offer being made to all of the other shareholders or any
requirement that the premium be shared with other shareholders of the Company.
The Permitted Bid definition does not allow partial bids.


                                      -4-
<PAGE>   5

        Right of Withdrawal. A Permitted Bid must allow withdrawal of securities
while the bid is required to be open for acceptance. This allows shareholders
to withdraw their deposited securities in order to react to the most recent
information or events up to the permitted expiry date of the bid. Thus, any
competing offer or other alternative for the shareholders in the later stages
of an outstanding offer will be available to all shareholders.

        The Board of Directors may, at its option, at any time prior to the
occurrence of a Flip-in Event elect to redeem all but not less than all of the
then outstanding Rights at a redemption price of (Cdn.)$0.0001 per Right. If an
offeror acquires 50% or more of the Common Shares held by shareholders
independent of the offeror pursuant to a Permitted Bid or Competing Permitted
Bid, the Board of Directors will be deemed to have elected to redeem the Rights.

Adjustments to Prevent Dilution

        The Exercise Price payable, the number of Rights and the number of
Common Shares or other securities or property issuable upon exercise of the
Rights are subject to adjustment from time to time to prevent dilution as set
forth in the Rights Agreement. With certain exceptions, no adjustment in the
Exercise Price will be required until cumulative adjustments require an
adjustment of at least 1% in such Exercise Price.

Cash Paid Instead of Issuing Fractional Shares

        No fractional portion less than integral multiples of one will be issued
upon exercise of a Right and in lieu thereof, payment in cash will be made based
on the Market Price of the Common Shares (as determined pursuant to the Rights
Agreement).

Redemption and Waiver

        The Board of Directors may, at its option, at any time prior to the
occurrence of a Flip-in Event, elect to redeem all but not less than all of the
then outstanding Rights at a redemption price of (Cdn.)$0.0001 per Right,
appropriately adjusted (the "Redemption Price"). The redemption of the Rights by
the Board of Directors may be made effective at such time, on such basis and
with such conditions as the Board of Directors in its sole discretion may
establish.

        If an offeror successfully completes a Permitted Bid by having taken up
and paid for not less than 50 per cent of the Voting Shares held by Independent
Shareholders pursuant to Permitted Bid Acquisitions, the Board of Directors
shall, without further formality, be deemed to have elected to redeem the Rights
at the Redemption Price on the Expiration Date of the Permitted Bid.


                                      -5-
<PAGE>   6

        If the Board of Directors elects to or is deemed to have elected to
redeem the Rights, the right to exercise the Rights will thereupon without
further action and without notice terminate and the only right thereafter of the
holder of a Right shall be to receive the Redemption Price. Within 10 days of
the Board of Directors electing or being deemed to have elected to redeem the
Rights, the Company shall give notice of such redemption to the holders of the
then outstanding Rights.

        The Board of Directors may until the occurrence of a Flip-in Event
determine, upon prior written notice delivered to the Rights Agent, to waive the
application of the price adjustment provisions of the Rights Agreement to any
particular Flip-in Event.

        The Board of Directors may prior to the Close of Business on the tenth
day following the Stock Acquisition Date determine to waive or to agree to waive
the application of the price adjustment provisions of the Rights Agreement to
the Flip-in Event giving rise to the Stock Acquisition Date, provided that the
Acquiring Person has (i) reduced its Beneficial Ownership of Voting Shares or
(ii) has entered into a contractual arrangement with the Company, acceptable to
the Board of Directors, to do so within 30 days of the date on which such
contractual arrangement is entered into, such that at the time the waiver
becomes effective such Person is no longer an Acquiring Person. In the event of
such a waiver becoming effective, such Flip-in Event shall be deemed not to have
occurred.

        Where a takeover bid, or other events giving rise to a Separation Time,
is withdrawn or otherwise terminated after the Separation Time has occurred and
prior to the occurrence of a Flip-in Event, or in any other circumstances prior
to the occurrence of a Flip-in Event, the Board of Directors may elect to redeem
all the outstanding Rights at the Redemption Price. Upon the Rights being
redeemed, all of the provisions of this Agreement shall continue to apply as if
the Separation Time had not occurred and Rights Certificates representing the
number of Rights held by each holder of record of Common Shares as of the
Separation Time had not been mailed to each such holder and for all purposes of
this Agreement the events giving rise to the Separation Time shall be deemed not
to have occurred.

No Shareholders' Rights Prior to Exercise

        Until a Right is exercised, the holder thereof, as such, will have no
rights as a shareholder of the Company (other than any rights resulting from
such holder's ownership of Common Shares), including, without limitation, the
right to vote or to receive dividends.

Amendment of Rights Agreement

        The provisions of the Rights Agreement may, without the approval of
Rights holders, be supplemented or amended by the Board of Directors in any
manner prior to receipt of shareholder approval in respect of the Rights
Agreement. After such date, the provisions of the Rights Agreement may be
amended by the Board in order to cure any ambiguity, defect or inconsistency, to
make changes which do not adversely affect the interests of holders of Rights
(excluding the interests of any Acquiring Person), or to shorten or lengthen any
time period under the Rights Agreement; provided, however, that


                                      -6-
<PAGE>   7

no amendment to adjust the time period governing redemption shall be made at
such time as the Rights are not redeemable.

Certain Antitakeover Effects

        The Rights approved by the Board are designed to protect and maximize
the value of the outstanding equity interests in the Company in the event of an
unsolicited attempt by an acquiror to take over the Company in a manner or on
terms not approved by the Board of Directors. The Company believes that takeover
attempts frequently include coercive tactics to deprive a Company's Board of
Directors and its shareholders of any real opportunity to determine the destiny
of the Company. The Rights have been declared by the Board in order to deter
such tactics, including a gradual accumulation of shares in the open market of a
20% or greater position to be followed by a partial or two- tier tender offer
that does not treat all shareholders equally. The Company believes that coercive
tactics unfairly pressure shareholders, squeeze them out of their investment
without giving them any real choice and deprive them of the full value of their
shares.

        The Rights Plan discourages discriminatory or unfair takeover offers for
the Company and gives the Board time, if appropriate, to pursue alternatives to
maximize shareholder value in the event of an unsolicited takeover bid for the
Company. Since the Rights Plan may substantially dilute an offeror's position,
it encourages an offeror to proceed by way of a Permitted Bid or to approach the
Board with a view to negotiation. The Permitted Bid provisions of the Rights
Plan are designed to ensure that, in any takeover bid, all shareholders are
treated equally, receive the maximum value for their investment and are given
adequate time to properly assess the takeover bid on a fully informed basis.

        The Rights Plan is not intended to deter full and fair offers for the
shares of the Company. The Rights Plan does not burden on the Company's
operations or financial capacity. The adoption of the Rights Plan will not
lessen or affect the duty of the Board to act honestly and in good faith with a
view to the best interests of the Company and its shareholders. The Rights Plan
is designed to provide the Board with the means to negotiate with an offeror and
with sufficient time to seek out and identify alternative transactions on behalf
of the Company's shareholders.

        A potential offeror not wishing to make a Permitted Bid may negotiate
with the Board to make a takeover bid on terms which the Board considers fair to
all shareholders. In such circumstances, the Board may waive the application of
the Rights Plan to that particular transaction or redeem the Rights, thereby
allowing such bid to proceed without dilution to the offeror.

        The Rights Plan is initially not dilutive and, until a Flip-in Event
occurs, is not expected to have any effect on the trading of Common Shares of
the Company. Upon a Flip-in Event occurring and the Rights separating from the
Common Shares, reported earnings and cash flow per share on a fully diluted or
non-diluted basis may be affected. Holders of Rights not exercising their Rights
upon the occurrence of a Flip-in Event may suffer substantial dilution. In
addition to exercising their Rights, holders will be able to sell their Rights.


                                      -7-
<PAGE>   8

        The Rights Plan is not intended to deter a person from seeking to
acquire control of the Company if such person is prepared to make a takeover bid
which is a Permitted Bid or Competing Permitted Bid in accordance with the
provisions of the Rights Plan. The Rights Plan is intended to make it
impracticable to acquire 20% or more of the outstanding Common Shares of the
Company other than by way of a Permitted Bid or a Competing Permitted Bid. This
impracticability arises from the Rights substantially diluting the holdings of a
person seeking control of the Company other than by a Permitted Bid or a
Competing Permitted Bid.

        The Company's Board of Directors believes that the Rights represent a
sound and reasonable means of addressing the complex issues of corporate policy
created by the current takeover environment. Accordingly, the Rights should not
preclude any takeover approved by the Board of Directors.

Item 2.        Exhibits.

               1.     Shareholder Protection Rights Agreement, dated as of
                      November 16, 1998 between Salix Pharmaceuticals, Ltd. and
                      Montreal Trust Company of Canada, including the form of
                      Rights Certificate, the form of Election to Exercise and
                      the form of Assignment attached thereto as Exhibits.

               2.     Memorandum of Association of Salix Holdings, Ltd.(1)

               3.     Articles of Association of Salix Holdings, Ltd.(2)

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

(1)  Incorporated by reference to Exhibit 3.1 to the Company's Registration
     Statement on Form S-1 filed on August 15, 1997.

(2)  Incorporated by reference to Exhibit 3.2 to the Company's Registration
     Statement on Form S-1 filed on August 15, 1997.


                                      -8-
<PAGE>   9

                                    SIGNATURE

        Pursuant to the requirements of Section 12 of the Securities Exchange
Act of 1934, the registrant has duly caused this registration statement to be
signed on its behalf by the undersigned, thereto duly authorized.

                                       SALIX PHARMACEUTICALS, LTD.


Date: November 16, 1998
                                       By: /s/ ROBERT P. RUSCHER
                                          -------------------------------------
                                            Robert P. Ruscher, Vice President


                                      -9-
<PAGE>   10

                                  EXHIBIT INDEX

<TABLE>
<CAPTION>
   EXHIBIT
     NO.                                     EXHIBIT
   -------                                   -------
<S>           <C>
      1       Shareholder Protection Rights Agreement, dated as of November 16,
              1998 between Salix Pharmaceuticals, Ltd. and Montreal Trust
              Company of Canada, including the form of Rights Certificate, the
              form of Election to Exercise and the form of Assignment attached
              thereto as Exhibits.
      2       Memorandum of Association of Salix Holdings, Ltd.(1)
      3       Articles of Association of Salix Holdings, Ltd.(2)
</TABLE>

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

(1)  Incorporated by reference to Exhibit 3.1 to the Company's Registration
     Statement on Form S-1 filed on August 15, 1997.

(2)  Incorporated by reference to Exhibit 3.2 to the Company's Registration
     Statement on Form S-1 filed on August 15, 1997.




<PAGE>   1
                                                                       EXHIBIT 1

                     SHAREHOLDER PROTECTION RIGHTS AGREEMENT


        THIS AGREEMENT made as of November 16, 1998


B E T W E E N:

                        SALIX PHARMACEUTICALS, LTD., a corporation
                        existing under the laws of the British Virgin Islands

                        (the "Corporation")

                                    - and -

                        MONTREAL TRUST COMPANY OF CANADA, a trust company
                        incorporated under the laws of Canada, as Rights Agent

                        (the "Rights Agent").


        WHEREAS the Board of Directors has determined that it is advisable and
in the best interests of the Corporation to adopt a shareholder protection
rights plan (the "Rights Plan") to ensure, to the extent possible, that all
shareholders of the Corporation are treated fairly in connection with any
take-over offer for the Corporation;

        AND WHEREAS in order to implement the Rights Plan the Board of Directors
has:

        (a)     authorized and declared a distribution of one (1) right (a
                "Right") effective at the Record Time in respect of each Common
                Share outstanding at that time;

        (b)     authorized the issuance of one (1) Right in respect of each
                Common Share issued after the Record Time and prior to the
                earlier of the Separation Time and the Expiration Time;

        (c)     authorized the issuance of Rights Certificates to holders of
                Rights pursuant to the terms and subject to the conditions set
                forth herein;

        AND WHEREAS each Right entitles the holder thereof, after the Separation
Time, to purchase securities of the Corporation pursuant to the terms and
subject to the conditions set forth herein;


<PAGE>   2
      AND WHEREAS the Corporation desires to appoint the Rights Agent to act on
behalf of the Corporation, and the Rights Agent is willing to so act, in
connection with the issuance, transfer, exchange and replacement of Rights
Certificates, the exercise of Rights and other matters referred to herein;

      NOW THEREFORE in consideration of the premises and their respective
covenants and agreements set forth herein, the parties hereby agree as follows:


                           ARTICLE 1 -- INTERPRETATION

1.1   CERTAIN DEFINITIONS

      For purposes of this Agreement, the following terms have the meanings
indicated:

      (a)   "ACQUIRING PERSON" means any Person who is the Beneficial Owner of
            20% or more of the outstanding Voting Shares, but shall not include:

            (i)   the Corporation or any Subsidiary of the Corporation;

            (ii)  any Person who becomes the Beneficial Owner of 20% or more of
                  the outstanding Voting Shares as a result of:

                  A.    a Voting Share Reduction;

                  B.    a Permitted Bid Acquisition;

                  C.    an Exempt Acquisition; or

                  D.    a Pro Rata Acquisition;

                  provided, however, that if a Person becomes the Beneficial
                  Owner of 20% or more of the outstanding Voting Shares by
                  reason of a Voting Share Reduction, a Permitted Bid
                  Acquisition, an Exempt Acquisition or a Pro Rata Acquisition,
                  and thereafter becomes the Beneficial Owner of a number of
                  additional Voting Shares exceeding 1% of the number of Voting
                  Shares outstanding (other than pursuant to a Voting Share
                  Reduction, a Permitted Bid Acquisition, an Exempt Acquisition
                  or a Pro Rata Acquisition), then, as of the date that such
                  Person becomes the Beneficial Owner of such additional Voting
                  Shares, such Person shall become an "Acquiring Person";


                                      -2-


<PAGE>   3
            (iii) for the period of 10 days after the Disqualification Date (as
                  defined below), any Person who becomes the Beneficial Owner of
                  20% or more of the outstanding Voting Shares as a result of
                  such Person becoming disqualified from relying on Clause
                  1.1(d)(vii) solely because such Person or the Beneficial Owner
                  of such Voting Shares is making or has announced an intention
                  to make a Take-over Bid, either alone or by acting jointly or
                  in concert with any other Person. For the purposes of this
                  definition, "DISQUALIFICATION DATE" means the first date of
                  public announcement of facts indicating that any Person is
                  making or has announced an intention to make a Take-over Bid;

            (iv)  an underwriter or member of a banking or selling group that
                  becomes the Beneficial Owner of 20% or more of the Voting
                  Shares in connection with a bona fide distribution to the
                  public of securities; or

            (v)   a Person (a "Grandfathered Person") who is the Beneficial
                  Owner of 20% or more of the outstanding Voting Shares of the
                  Corporation determined as at the date hereof, provided,
                  however, that this exception shall not be, and shall cease to
                  be, applicable to a Grandfathered Person in the event that
                  such Grandfathered Person shall, after the date hereof, become
                  the Beneficial Owner of additional Voting Shares of the
                  Corporation that increases its Beneficial Ownership of Voting
                  Shares by more than 1% of the number of Voting Shares
                  outstanding, other than through a Permitted Bid Acquisition or
                  a Pro Rata Acquisition.

      (b)   "AFFILIATE", when used to indicate a relationship with a specified
            Person, means a Person that directly, or indirectly through one or
            more intermediaries, controls, or is controlled by, or is under
            common control with, such specified Person.

      (c)   "ASSOCIATE", when used to indicate a relationship with any Person,
            means:

            (i)   any body corporate of which the Person beneficially owns,
                  directly or indirectly, voting securities carrying more than
                  10 per cent of the voting rights attached to all voting
                  securities of the body corporate for the time being
                  outstanding;

            (ii) any partner, spouse or child of that Person;

            (iii) any trust or estate in which the Person has a substantial
                  beneficial interest or as to which the Person serves as
                  trustee or in a similar capacity;


                                      -3-


<PAGE>   4
            (iv)  any relative of the Person, where the relative has the same
                  home as the Person; or

            (v)   any relative of the spouse of the Person where the relative
                  has the same home as the Person.

      (d)   A Person is deemed the "BENEFICIAL OWNER" and to have "BENEFICIAL
            OWNERSHIP" of, and to "BENEFICIALLY OWN":

            (i)   any securities as to which such Person or any of such Person's
                  Affiliates or Associates is the beneficial owner (and, for the
                  purposes of this Agreement, a "beneficial owner" of securities
                  shall include a Person who is the owner at law or in equity of
                  such securities);

            (ii)  any securities as to which such Person or any of such Person's
                  Affiliates or Associates has, directly or indirectly:

                  A.    the right to become beneficial owner (whether such right
                        is exercisable immediately or after the passage of time
                        or upon the occurrence of a contingency or payment of
                        instalments or otherwise) pursuant to any agreement,
                        arrangement, pledge or understanding or otherwise,
                        whether or not in writing (other than (x) customary
                        agreements with and between underwriters and/or banking
                        group and/or selling group members with respect to a
                        bona fide distribution to the public of securities and
                        (y) pledges of securities in the ordinary course of
                        business that meet all of the conditions specified in
                        Rule 13d-3(d)(3) under the 1934 Exchange Act), or upon
                        the exercise of conversion rights, exchange rights,
                        rights (other than the Rights), warrants or options, or
                        otherwise; or

                  B.    the right to vote (whether such right is exercisable
                        immediately or after the passage of time or upon the
                        occurrence of a contingency or payment of instalments or
                        otherwise) pursuant to any agreement, arrangement or
                        understanding or otherwise whether or not in writing
                        (other than (x) pledges of securities in the ordinary
                        course of business that meet all of the circumstances
                        specified in Rule 13-3(d)(3) under the 1934 Exchange Act
                        other than the condition in Rule 13d- 3(3)(3)(ii) and
                        (y) a pledge agreement with a registered securities
                        dealer relating to the extension of credit for purchases
                        of securities on margin in the ordinary course of the
                        dealer's business); and

            (iii) any securities which are beneficially owned by any other
                  Person with which such Person or any of such Person's
                  Affiliates is acting jointly or in concert


                                      -4-


<PAGE>   5
                  (other than pursuant to (x) customary agreements with and
                  between underwriters and/or banking group and/or selling group
                  members with respect to a bona fide distribution to the public
                  of securities and (y) pledges of securities in the ordinary
                  course of business that meet all of the conditions specified
                  in Rule 13d-3(d)(3) under the 1934 Exchange Act);

            provided, however, that a Person shall NOT be deemed the "Beneficial
            Owner" or to have "Beneficial Ownership" of, or to "Beneficially
            Own", any security:

            (iv)  solely because such security has been deposited or tendered
                  pursuant to a tender or exchange offer or Take-over Bid made
                  by such Person or any of such Person's Affiliates or
                  Associates until the earlier of such deposited or tendered
                  security being accepted unconditionally for payment or
                  exchange or being taken up and paid for;

            (v)   solely because such Person or any of such Person's Affiliates
                  or Associates has or shares the power to vote or direct the
                  voting of such security pursuant to a revocable proxy given in
                  response to a public proxy solicitation made pursuant to, and
                  in accordance with, the applicable rules and regulations under
                  the Corporations Act, the Securities Act and the 1934 Exchange
                  Act, except if such power (or the arrangements relating
                  thereto) is then reportable under Section 101 of the
                  Securities Act or under Item 6 of Schedule 13D under the 1934
                  Exchange Act;

            (vi)  solely because such Person or any of such Person's Affiliates
                  or Associates has or shares the power to vote or direct the
                  voting of such security in connection with, or in order to
                  participate in, a public proxy solicitation made or to be made
                  pursuant to, and in accordance with, the applicable rules and
                  regulations referred to in Clause 1.1(d)(v), except if such
                  power (or the arrangements relating thereto) is then
                  reportable under Section 101 of the Securities Act or under
                  Item 6 of Schedule 13D under the 1934 Exchange Act;

            (vii) solely because such Person (hereinafter in this Clause
                  1.1(d)(vii) referred to as the "MANAGER"), being principally
                  engaged in the business of managing investment funds for other
                  Persons (which others, for greater certainty, may include and
                  be limited to one or more employee benefit plans or pension
                  plans) who are not Affiliates or Associates of the Manager and
                  who do not act jointly or in concert with the Manager as part
                  of the Manager's duties as agent for fully managed accounts,
                  holds or exercises voting or dispositive power over such
                  security and such voting or dispositive power over such
                  security is held in the ordinary course of such business in
                  the performance of


                                      -5-


<PAGE>   6
                  the duties of the Manager for the account of the other Person;
                  provided, however, that:

                  A.    such security shall be deemed, in such case, to be
                        Beneficially Owned by such other Persons; and

                  B.    neither the Manager nor any Person acting jointly or in
                        concert with the Manager is then making a Take-over Bid
                        or has not then publicly announced an intention to make
                        a Take-over Bid, either alone or by acting jointly or in
                        concert with any other Person;

                  and provided further that, notwithstanding the foregoing, the
                  Board of Directors shall have the right to and may determine,
                  acting in good faith, that conditions exist which should
                  disentitle the Manager from relying on this Clause 1.1(d)(vii)
                  and, in such event, the Manager's Beneficial Ownership of
                  securities shall be determined without reference to this
                  Clause 1.1(d)(vii); or

            (viii)solely because such Person (hereinafter in this Clause
                  1.1(d)(viii) referred to as the "TRUST COMPANY") holds or
                  exercises voting or dispositive power over such securities,
                  provided that:

                  A.    the Trust Company is licensed to carry on the business
                        of a trust company under applicable law and, as such,
                        acts as trustee or administrator or in similar capacity
                        in relation to the estates of deceased or incompetent
                        Persons (each an "ESTATE ACCOUNT") or in relation to
                        other accounts (each an "OTHER ACCOUNT") and holds such
                        voting or dispositive power over such security in the
                        ordinary course of such duties for the estate of any
                        such deceased or incompetent Person or for such other
                        accounts; and

                  B.    the Trust Company is not then making a Take-over Bid or
                        has not then publicly announced an intention to make a
                        Take-over Bid, either alone or by acting jointly or in
                        concert with any other Person;

                  and provided further that, notwithstanding the foregoing, the
                  Board of Directors shall have the right to and may determine,
                  acting in good faith, that conditions exist which should
                  disentitle the Trust Company from relying on this Clause
                  1.1(d)(viii) and, in such event, the Trust Company's
                  Beneficial Ownership of securities shall be determined without
                  reference to this Clause 1.1(d)(viii); or


                                      -6-


<PAGE>   7
            (ix)  solely because such Person is a client of the same Manager as
                  another Person on whose account the Manager holds or exercises
                  voting or dispositive power over such security, or solely
                  because such Person is an Estate Account or an Other Account
                  of the same Trust Company as another Person on whose account
                  the Trust Company holds or exercises voting or dispositive
                  power over such security; or

            (x)   solely because any such Person, any of such Person's
                  Affiliates or Associates or any other Person referred to in
                  paragraph (iii) of this definition has an agreement,
                  arrangement or understanding, whether or not in writing (but
                  other than of the nature otherwise referred to in this
                  Subsection 1.1(d)), with respect to one or more shareholder
                  proposals or a matter or matters to come before a particular
                  meeting of shareholders, including the election of directors.

            For purposes of this Agreement, in determining the percentage of the
            outstanding Voting Shares with respect to which a Person is or is
            deemed to be the Beneficial Owner, all Voting Shares as to which
            such Person is deemed the Beneficial Owner shall be deemed
            outstanding.

      (e)   "BOARD OF DIRECTORS" means the board of directors of the
            Corporation.

      (f)   "BUSINESS DAY" means any day other than a Saturday, Sunday or a day
            on which chartered banks in the City of Toronto, Ontario or banks in
            the City of Palo Alto, California (or, if the Corporation's
            principal place of business ceases to be in Palo Alto, California,
            such other city in which the principal place of business of the
            Corporation is located) are authorized or obliged by law to close.

      (g)   "CANADIAN DOLLAR EQUIVALENT" of any amount which is expressed in
            United States dollars means, on any date, the Canadian dollar
            equivalent of such amount determined by multiplying such amount by
            the U.S.-Canadian Exchange Rate in effect on such date.

      (h)   "CANADIAN-U.S. EXCHANGE RATE" means, on any date, the inverse of the
            U.S.-Canadian Exchange Rate in effect on such date.

      (i)   "CLOSE OF BUSINESS" on any given date means the time on such date
            (or, if such date is not a Business Day, the time on the next
            succeeding Business Day) at which the office of the transfer agent
            for the Common Shares in the City of Toronto (or, after the
            Separation Time, the office of the Rights Agent in the City of
            Toronto), is closed to the public.


                                      -7-


<PAGE>   8
      (j)   "COMMON SHARES" means the common shares in the capital of the
            Corporation and "COMMON SHARES", when used with reference to any
            Person other than the Corporation, means the class or classes of
            shares (or similar equity interest) with the greatest per share
            voting power entitled to vote generally in the election of all
            directors of such other Person or the equity securities or other
            equity interest having power (whether or not exercised) to control
            or direct the management of such other Person or, if such other
            Person is a Subsidiary of another Person, the Person or Persons
            which ultimately control such first-mentioned other Person.

      (k)   "COMPETING PERMITTED BID" means a Take-over Bid made while another
            Permitted Bid is in existence and that satisfies all of the
            provisions of a Permitted Bid except that the condition set forth in
            subparagraph 1.1(bb)(ii) may provide that the Voting Shares may be
            taken up or paid for on, and may not be withdrawn after, a date
            which is not earlier than the later of 21 days after the date of the
            Take-over Bid or the earliest date on which Voting Shares may be
            taken up or paid for under any other Permitted Bid that is then in
            existence for the Voting Shares.

      (l)   "CONTROLLED" means, in determining whether a corporation is deemed
            to be "CONTROLLED" by another Person or Persons, a situation where a
            Person is controlled by another Person or Persons in any manner
            whatsoever that results in control in fact by that other Person or
            Persons, whether directly or indirectly, and whether through share
            ownership, a trust, a contract or otherwise, including in the case
            of control of a corporation where

            (i)  (A)    securities entitled to vote in the election of
                        directors carrying more than 50% of the votes for the
                        election of directors are held, directly or indirectly,
                        by or on behalf of the other Person or Persons; and

                 (B)    the votes carried by such securities are entitled, if
                        exercised, to elect a majority of the board of directors
                        of such corporation; or

            (ii)  the corporation is otherwise controlled by such other Person
                  or Persons;

            and "CONTROL" and "CONTROLLING" shall be interpreted accordingly.

      (m)   "CORPORATIONS ACT" means the International Business Companies Act 
            (Cap.291) of the British Virgin Islands, as amended, or such other
            corporate legislation under which the Corporation may exist under or
            be subject to from time to time, and the regulations made
            thereunder, as now in effect or as the same may from time to time be
            amended, re-enacted or replaced.

      (n)   "ELECTION TO EXERCISE" has the meaning attributed thereto in Clause
            2.2(d)(i).


                                      -8-


<PAGE>   9
      (o)   "EXEMPT ACQUISITION" means a share acquisition in respect of which
            the Board of Directors has waived the application of Section 3.1
            pursuant to the provisions of Subsection 5.1(d) or 5.1(e).

      (p)   "EXERCISE PRICE" means, as of any date, the price at which a holder
            of a Right may purchase the securities issuable upon exercise of one
            whole Right. Until adjustment thereof in accordance with the terms
            hereof, the Exercise Price shall be $60.

      (q)   "EXPIRATION TIME" means the earlier of (i) the Termination Time and
            (ii) the Close of Business on the fifth anniversary of the date of
            this Agreement.

      (r)   "EXPIRY DATE OF THE PERMITTED BID" means the date, which shall not
            be less than 90 days following the date on which the proper
            Take-over Bid documentation relating to such Permitted Bid is sent
            to the shareholders of the Corporation, which is indicated in such
            documentation as the date until which such Permitted Bid is open for
            acceptance.

      (s)   "FLIP-IN EVENT" means a transaction or event in or pursuant to which
            any Person becomes an Acquiring Person.

      (t)   "INDEPENDENT SHAREHOLDERS" means beneficial owners of Voting Shares,
            other than (i) any Acquiring Person, (ii) any Offeror, (iii) any
            Affiliate or Associate of any Acquiring Person or Offeror, (iv) any
            Person acting jointly or in concert with any Acquiring Person or
            Offeror or any Affiliate of any Acquiring Person or Offeror, in each
            case in respect of Voting Shares beneficially owned by such persons.

      (u)   "MARKET PRICE" per security of any securities on any date of
            determination means the average of the daily closing prices per
            security of such securities (determined as described below) on each
            of the 20 consecutive Trading Days through and including the Trading
            Day immediately preceding such date; provided, however, that if an
            event of a type analogous to any of the events described in Section
            2.3 hereof shall have caused the closing prices used to determine
            the Market Price on any Trading Day not to be fully comparable with
            the closing price on the Trading Day immediately preceding such date
            of determination each such closing price so used shall be
            appropriately adjusted in a manner analogous to the applicable
            adjustment provided for in Section 2.3 in order to make it fully
            comparable with the closing price on the Trading Day immediately
            preceding such date of determination. The closing price per security
            of any securities on any date shall be:

            (i)   the closing board lot sale price or, in case no such sale
                  takes place on such date, the average of the closing bid and
                  asked prices for each of such securities as reported by the
                  principal stock exchange or quotation system (as


                                      -9-


<PAGE>   10
                  determined by the Board of Directors) on which such securities
                  are listed or admitted to trading;

            (ii)  if for any reason none of such prices is available on such day
                  or the securities are not listed or admitted to trading on a
                  stock exchange or quotation system, the last sale price, or in
                  case no sale takes place on such date, the average of the high
                  bid and low asked prices for each of such securities in the
                  over-the-counter market, as quoted by any reporting system
                  then in use (as determined by the Board of Directors); or

            (iii) if for any reason none of such prices is available on such day
                  or the securities are not listed or admitted to trading on a
                  stock exchange or quotation system or quoted by any such
                  reporting system, the average of the closing bid and asked
                  prices as furnished by a professional market maker making a
                  market in the securities selected by the Board of Directors;

            provided, however, that if for any reason none of such prices is
            available on such day, the closing price per security of such
            securities on such date means the fair value per security of such
            securities on such date as determined by the Board of Directors,
            after consultation with a nationally recognized investment dealer or
            investment banker with respect to the fair value per security of
            such securities. The Market Price shall be expressed in Canadian
            dollars and, if initially determined in respect of any day forming
            part of the 20 consecutive Trading Day period in question in United
            States dollars, such amount shall be translated into Canadian
            dollars on such date at the Canadian Dollar Equivalent thereof.

            Notwithstanding the foregoing, where the Board is Directors is
            satisfied that the Market Price of securities as determined herein
            was affected by an anticipated or actual Take-over Bid or by
            improper manipulation, the Board of Directors may determine the
            Market Price of securities, such determination to be based upon a
            finding as to the price at which a holder of securities of that
            class could reasonably have expected to dispose of his securities
            immediately prior to the relevant date excluding any change in price
            reasonably attributable to the anticipated or actual Take-over Bid
            or to the improper manipulation.

      (v)   "1934 EXCHANGE ACT" means the Securities Exchange Act of 1934 of the
            United States, as amended, and the rules and regulations thereunder
            as now in effect or as the same may from time to time be amended,
            re-enacted or replaced.

      (w)   "1933 SECURITIES ACT" means the Securities Act of 1933 of the United
            States, as amended and the rules and regulations thereunder as now
            in effect or as the same may from time to time be amended,
            re-enacted or replaced.


                                      -10-


<PAGE>   11
      (x)   "OFFER TO ACQUIRE" includes:

            (i)   an offer to purchase or a solicitation of an offer to sell
                  Voting Shares, or a public announcement of an intention to
                  make such an offer or solicitation; and

            (ii)  an acceptance of an offer to sell Voting Shares, whether or
                  not such offer to sell has been solicited;

            or any combination thereof, and the Person accepting an offer to
            sell shall be deemed to be making an Offer to Acquire to the Person
            that made the offer to sell.

      (y)   "OFFEROR" means a Person who has publicly announced an intention to
            make, or who has made, a Take-over Bid, including a Permitted Bid.

      (z)   "OFFEROR'S SECURITIES" means the aggregate of the Voting Shares
            Beneficially Owned on the date of a Take-over Bid by an Offeror.

      (aa)  "OFFICER'S CERTIFICATE" of a Person shall mean a certificate signed
            by the Chairman of the board of directors, the President or any Vice
            President and by the Secretary, the Treasurer, and Assistant
            Secretary or an Assistant Treasurer of such Person.

      (bb)  "PERMITTED BID" means a Take-over Bid made in compliance with, and
            not on a basis which is exempt from or otherwise not subject to, the
            provisions of Sections 95 through 98, inclusive, and Section 100 of
            the Securities Act and, if applicable, Sections 10, 13(d) and 14 of
            the 1934 Exchange Act and the rules and regulations thereunder (or
            in each case such comparable or successor laws or regulations as
            shall then be in effect, or if all such provisions shall be repealed
            and there shall be no comparable or successor laws then in effect,
            pursuant to Sections 95 through 98, inclusive, and Section 100 of
            the Securities Act as in effect on the date of this Agreement) and
            in compliance with all other applicable laws (including the
            securities laws and regulations of all other relevant jurisdictions)
            and which is also made in compliance with the following additional
            provisions and conditions:

            (i)   the Take-over Bid shall be made for all of the Common Shares
                  to all holders of record of Common Shares wherever resident or
                  registered on the books of the Corporation;

            (ii)  the Take-over Bid contains, and the take-up and payment for
                  securities tendered or deposited is subject to, an irrevocable
                  and unqualified provision that no Voting Shares will be taken
                  up or paid for pursuant to the Take-over Bid prior to the
                  close of business on the date which is not less than 90 days
                  following the date of the Take-over Bid and only if at such
                  date more than


                                      -11-


<PAGE>   12
                  50% of the Voting Shares held by Independent Shareholders
                  shall have been deposited or tendered pursuant to the
                  Take-over Bid and not withdrawn;

            (iii) unless the Take-over Bid is withdrawn in accordance with
                  applicable law, the Take-over Bid contains an irrevocable and
                  unqualified provision that Voting Shares may be deposited
                  pursuant to such Take-over Bid at any time during the period
                  of time described in Clause 1.1(bb)(ii) and that any Voting
                  Shares deposited pursuant to the Take-over Bid may be
                  withdrawn until taken up and paid for;

            (iv)  the Take-over Bid contains an irrevocable and unqualified
                  provision that in the event that the deposit condition set
                  forth in Clause 1.1(bb)(ii) is satisfied the Offeror will make
                  a public announcement of that fact and the Take-over Bid will
                  remain open for deposits and tenders of Voting Shares for not
                  less than ten Business Days from the date of such public
                  announcement; and

            (v)   the Offeror shall make arrangements reasonably required by the
                  Board of Directors of the Corporation to allow for the deposit
                  in acceptance of such Take-over Bid of shares issued on
                  exercise of options held by employees of the Corporation and
                  its subsidiaries;

            and the Board of Directors acting in good faith determines, prior to
            the expiry of the Take-over Bid, that the Take-over Bid complies
            with the provisions of this Subsection 1.1(bb).

            For purposes of this Agreement, if a Permitted Bid ceases to be a
            Permitted Bid because it ceases to meet any or all of the
            requirements mentioned above at any time, any acquisition of Voting
            Shares made pursuant to such Permitted Bid, including any
            acquisition of Voting Shares theretofore made, shall cease to be a
            Permitted Bid Acquisition.

      (cc)  "PERMITTED BID ACQUISITION" means an acquisition of Common Shares or
            Voting Shares made pursuant to a Permitted Bid or a Competing
            Permitted Bid made after the Board of Directors, acting in good
            faith, has determined, that the Take-over Bid complies with the
            provisions of Subsection 1.1(bb).

      (dd)  "PERSON" includes any individual, firm, partnership, association,
            trust, trustee, executor, administrator, legal personal
            representative, government, governmental body or authority, group
            (as such term is used in Rule 13d-5 under the 1934 Exchange Act, as
            in effect on the date of this Agreement), corporation or other
            incorporated or unincorporated organization.


                                      -12-


<PAGE>   13
      (ee)  "PRO RATA ACQUISITION" means an acquisition by a Person of Voting
            Shares pursuant to (w) any dividend reinvestment plan or share
            purchase plan of the Corporation, (x) a stock dividend, a stock
            split or other event pursuant to which such Person becomes the
            Beneficial Owner of Voting Shares on the same pro rata basis as all
            other holders of Voting Shares of the same class or series, (y) the
            exercise (including the grant) of rights granted to such Person to
            purchase Voting Shares distributed to all holders of Voting Shares
            pursuant to a bona fide rights offering which complies with the
            requirements of Policy 6.2 of the Ontario Securities Commission or
            is made pursuant to a prospectus or (z) a distribution to the public
            of Voting Shares, or securities convertible into or exchangeable for
            Voting Shares, made pursuant to a prospectus or by way of a private
            placement completed in accordance with applicable securities
            legislation; provided, however, in the case of an acquisition
            referred to in Subclauses (y) or (z), such acquisitions are made for
            not more than such number of Voting Shares or of such securities as
            is necessary for such Person to maintain the percentage of Voting
            Shares it held immediately prior to the announcement of such rights
            offering or distribution to the public or private placement, as the
            case may be.

      (ff)  "RECORD TIME" means the Close of Business on November 16, 1998.

      (gg)  "REDEMPTION PRICE" has the meaning attributed thereto in Subsection
            5.1(a).

      (hh)  "REGULAR PERIODIC CASH DIVIDEND" means cash dividends paid at
            regular intervals in any fiscal year of the Corporation to the
            extent that such cash dividends do not, in the aggregate, exceed in
            any fiscal year the greatest of:

            (i)   200% of the aggregate amount of cash dividends declared
                  payable by the Corporation on its Common Shares in its
                  immediately preceding fiscal year;

            (ii)  300% of the arithmetic mean of the aggregate amounts of cash
                  dividends declared payable by the Corporation on its Common
                  Shares in its three immediately preceding fiscal years; and

            (iii) 100% of the aggregate consolidated net income of the
                  Corporation, before extraordinary items, for its immediately
                  preceding fiscal year.

      (ii)  "RIGHTS CERTIFICATE" means the certificates representing the Rights
            after the Separation Time which shall be substantially in the form
            attached hereto as Exhibit A.

      (jj)  "RIGHTS REGISTER" has the meaning attributed thereto in Subsection
            5.1(a).


                                      -13-


<PAGE>   14
      (kk)  "SECURITIES ACT" means the Securities Act, R.S.O. 1990, c. S.5, as
            amended, and the regulations made thereunder, as now in effect or as
            the same may from time to time be amended, re-enacted or replaced.

      (ll)  "SEPARATION TIME" means the Close of Business on the tenth day after
            the earlier of:

            (i)   the Stock Acquisition Date; and

            (ii)  the date of the commencement of, or first public announcement
                  of the intent of any Person (other than the Corporation or any
                  Subsidiary of the Corporation) to commence, a Take-over Bid
                  (other than a Permitted Bid, so long as such Take-over Bid
                  continues to satisfy the requirements of a Permitted Bid or a
                  Competing Permitted Bid);

            or such earlier or later date as may from time to time be determined
            by the Board of Directors, provided that:

                  (A)   if any such Take-over Bid expires, is cancelled, is
                        terminated or is otherwise withdrawn prior to the
                        Separation Time, such offer shall be deemed, for the
                        purposes of this Subsection 1.1(kk), never to have been
                        made; and

                  (B)   if the Board of Directors determines pursuant to
                        Subsection 5.1(d) or (e) to waive the application of
                        Section 3.1 to a Flip-in Event, the Separation Time in
                        respect of such Flip-in Event shall be deemed never to
                        have occurred.

      (mm)  "SPECIAL MEETING" means a special meeting of the holders of Voting
            Shares called by the Board of Directors for the purpose of:

            (i)   ratifying the distribution and continued existence of the
                  Rights in accordance with Subsection 5.4(f); or

            (ii)  approving an amendment, variation or rescission of any of the
                  provisions of this Agreement pursuant to Subsections 5.4(b),
                  5.4(c) or 5.4(e).

      (nn)  "STOCK ACQUISITION DATE" means the first date of public announcement
            (which for purposes of this definition includes, without limitation,
            a report filed pursuant to Section 101 of the Securities Act or
            Section 13(d) of the 1934 Exchange Act) of facts indicating that a
            Person has become an Acquiring Person.

      (oo)  "SUBSIDIARY" means a corporation which, in respect of another
            corporation, is:


                                      -14-


<PAGE>   15
            (i)   controlled by:

                  A.    that other; or

                  B.    that other and one or more corporations each of which is
                        controlled by that other; or

                  C.    two or more corporations each of which is controlled by
                        that other; or

            (ii) a Subsidiary of a corporation that is that other's Subsidiary;

      (pp)  "TAKE-OVER BID" means an Offer to Acquire Voting Shares or other
            securities which (assuming the Voting Shares or other securities
            subject to the Offer to Acquire are acquired at the date of the
            Offer to Acquire by the Person making the Offer to Acquire),
            together with the Offeror's Securities, would constitute in the
            aggregate 20% or more of the outstanding Voting Shares at the date
            of the Offer to Acquire (including all Voting Shares that may be
            acquired upon exercise of all rights of conversion, exchange or
            purchase attaching to the other securities.

      (qq)  "TERMINATION TIME" means the time at which the right to exercise
            Rights shall terminate pursuant to Subsections 3.2(b) or 5.1(c).

      (rr)  "TRADING DAY", when used with respect to any securities, means any
            day on which the principal securities exchange or quotation system
            (as determined by the Board of Directors) on which such securities
            are listed or admitted to trading or quotation is open for the
            transaction of business or, if the securities are not listed or
            admitted to trading or quotation on any Canadian or United States
            securities exchange, a Business Day.

      (ss)  "U.S.-CANADIAN EXCHANGE RATE" means, on any date:

            (i)   if on such date the Bank of Canada sets an average noon spot
                  rate of exchange for the conversion of one United States
                  dollar into Canadian dollars, such rate; and

            (ii)  in any other case, the rate for such date for the conversion
                  of one United States dollar into Canadian dollars calculated
                  in such manner as may be determined by the Board of Directors
                  from time to time acting in good faith.

      (tt)  "U.S. DOLLAR EQUIVALENT" of any amount which is expressed in
            Canadian dollars means, on any date, the United States dollar
            equivalent of such amount determined


                                      -15-


<PAGE>   16
            by multiplying such amount by the Canadian-U.S. Exchange Rate in
            effect on such date.

      (uu)  "VOTING SHARES" means the Common Shares of the Corporation and any
            other shares of capital stock or voting interests of the Corporation
            entitled to vote generally in the election of directors and "VOTING
            SHARES", when used with reference to any Person other than the
            Corporation, means common shares of such other Person and any other
            shares of capital stock or voting interests of such other Person
            entitled to vote generally in the election of the directors of such
            other Person. For purposes of this Agreement, the percentage of
            Voting Shares Beneficially Owned by any Person shall be, and be
            deemed to be, the product determined by the formula:

                         A
                        --- 
                  100 X  B

            where

            A     = the aggregate number of votes for the election of all
                  directors generally attaching (or which would be attached) to
                  the Voting Shares Beneficially Owned by such Person; and

            B     = the aggregate number of votes for the election of all
                  directors generally attaching to all outstanding Voting
                  Shares.

            Where any Person is deemed to Beneficially Own unissued Voting
            Shares, such Voting Shares shall be deemed to be outstanding for the
            purpose of both A and B above.

      (vv)  "VOTING SHARE REDUCTION" means an acquisition or redemption by the
            Corporation of Voting Shares which, by reducing the number of Voting
            Shares outstanding, increases the proportionate number of Voting
            Shares Beneficially Owned by any Person to 20% or more of the Common
            Shares or Voting Shares then outstanding.

1.2   ACTING JOINTLY OR IN CONCERT

      For the purposes of this Agreement, whether Persons are acting jointly or
in concert is a question of fact in each circumstance. Notwithstanding the
foregoing, a Person shall be deemed to be acting jointly or in concert with
another Person if such Person is presumed to be acting jointly or in concert
with such other Person for purposes of Section 91 of the Securities Act.

      Notwithstanding the foregoing, and for greater certainty, the phrase,
"acting jointly or in concert", wherever used in this Agreement, shall not
include conduct:


                                      -16-


<PAGE>   17
      (a)   unrelated to Voting Shares of the Corporation; or

      (b)   consisting solely of:

            (i)   voting or directing the vote of securities of the Corporation
                  pursuant to a revocable proxy given in response to a public
                  proxy solicitation;

            (ii)  voting or directing the vote of securities of the Corporation
                  in connection with or in order to participate in a public
                  proxy solicitation made or to be made; or

            (iii) having an agreement, arrangement or understanding with respect
                  to a shareholder proposal or a matter or matters to come
                  before a particular meeting of shareholders, including the
                  election of directors.

1.3   CURRENCY

      All sums of money which are referred to in this Agreement are expressed in
lawful money of Canada, unless otherwise specified.

1.4   NUMBER AND GENDER

      Wherever the context so requires, terms used herein importing the singular
number only shall include the plural and vice versa and words importing any one
gender shall include all others.

1.5   SECTIONS AND HEADINGS

      The division of this Agreement into Articles, Sections, Subsections,
Clauses and Subclauses and the insertion of headings are for convenience of
reference only and shall not affect the construction or interpretation of this
Agreement. The terms "this Agreement", "hereof", "hereunder" and similar
expressions refer to this Agreement and not to any particular Article, Section
or other portion hereof and include any agreement or instrument supplemental or
ancillary hereto. Unless something in the subject matter or context is
inconsistent therewith, references herein to Articles, Sections, Subsections,
Clauses and Subclauses are to Articles, Sections, Subsections, Clauses and
Subclauses of this Agreement.

1.6   STATUTORY REFERENCES

      Unless the context otherwise requires, any reference herein to a specific
Section, Subsection, Clause or Rule of any act or regulation shall be deemed to
refer to the same as it may be renumbered, amended, re-enacted or replaced or,
if repealed and there shall be no replacement therefor, to the same as it is in
effect on the date of this Agreement.


                                      -17-


<PAGE>   18
                             ARTICLE 2 -- THE RIGHTS

2.1   THE RIGHTS; LEGEND ON COMMON SHARE CERTIFICATES

      (a)   Certificates representing Common Shares that are issued and
            outstanding at the later of the Record Time shall evidence one
            Right for each Common Share evidenced thereby, notwithstanding the
            absence of the legend referred to below, until the earlier of (i)
            the Separation Time and (ii) the Expiration Time. Certificates for
            Common Shares issued after the later of (i) the Record Time and (ii)
            the date on which all regulatory approvals for this Agreement have
            been received but prior to the earlier of (i) the Separation Time
            and (ii) the Expiration Time shall also evidence one Right for each
            Common Share represented thereby.

      (b)   All such certificates for Common Shares shall have impressed on,
            printed on, written on or otherwise affixed to them the following
            legend:

                  "Until the Separation Time (as defined in the Rights Agreement
                  referred to below), this certificate also evidences and
                  entitles the holder hereof to certain Rights as set forth in a
                  Shareholder Protection Rights Agreement made as of November 4,
                  1998 (the "Rights Agreement"), between Salix Pharmaceuticals,
                  Ltd. (the "Corporation") and Montreal Trust Company of Canada
                  (the "Rights Agent"), the terms of which are incorporated
                  herein by this reference and a copy of which is on file at the
                  principal office of the Corporation. Under certain
                  circumstances, as set forth in the Rights Agreement, such
                  Rights may be amended or redeemed, may expire, may become void
                  (if, in certain cases, they are "Beneficially Owned" by an
                  "Acquiring Person", as such terms are defined in the Rights
                  Agreement, or a transferee thereof), or may be evidenced by
                  separate certificates and may no longer be evidenced by this
                  certificate. The Corporation will mail, or arrange for the
                  mailing of, a copy of the Rights Agreement to the holder of
                  this certificate without charge promptly after the receipt of
                  a written request therefor."

            Certificates representing Common Shares issued and outstanding at
            the Record Time shall also evidence one Right for each Common Share
            evidenced thereby, notwithstanding the absence of the foregoing
            legend, until the Close of Business on the earlier of the Separation
            Time and the Expiration Time.


2.2   INITIAL EXERCISE PRICE; EXERCISE OF RIGHTS; DETACHMENT OF RIGHTS


                                      -18-


<PAGE>   19
      (a)   Subject to adjustment as herein set forth, each Right will entitle
            the holder thereof, after the Separation Time and prior to the
            Expiration Time, to purchase one Common Share for the Exercise
            Price, or the U.S. Dollar Equivalent of the Exercise Price as at the
            Business Day immediately preceding the Separation Time (which
            Exercise Price and number of Common Shares are subject to adjustment
            as set forth below). Notwithstanding any other provision of this
            Agreement, any Rights held by the Corporation or any of its
            Subsidiaries shall be void.

      (b)   Until the Separation Time, (i) the Rights shall not be exercisable
            and no Right may be exercised and (ii) for administrative purposes,
            each Right will be evidenced by the certificate for the associated
            Common Share registered in the name of the holder thereof (which
            certificate shall be deemed to represent a Rights Certificate) and
            will be transferable only together with, and will be transferred by
            a transfer of, such associated Common Share.

      (c)   After the Separation Time and prior to the Expiration Time, the
            Rights may be exercised and the registration and transfer of the
            Rights shall be separate from and independent of Common Shares.
            Promptly following the Separation Time, the Rights Agent will mail
            to each holder of record of Common Shares as of the Separation Time
            (other than an Acquiring Person and, in respect of any Rights
            Beneficially Owned by such Acquiring Person which are not held of
            record by such Acquiring Person, the holder of record of such
            Rights), at such holder's address as shown on the records of the
            Corporation (the Corporation hereby agreeing to furnish copies of
            such records to the Rights Agent for this purpose):

            (i)   a Rights Certificate appropriately completed, representing the
                  number of Rights held by such holder at the Separation Time
                  and having such marks of identification or designation and
                  such legends, summaries or endorsements printed thereon as the
                  Corporation may deem appropriate and as are not inconsistent
                  with the provisions of this Agreement, or as may be required
                  to comply with any law or with any rule or regulation made
                  pursuant thereto or with any rule or regulation of any stock
                  exchange or quotation system on which the Rights may from time
                  to time be listed or traded, or to conform to usage; and

            (ii)  a disclosure statement prepared by the Corporation describing
                  the Rights.

      (d)   Rights may be exercised in whole or in part on any Business Day
            after the Separation Time and prior to the Expiration Time by
            submitting to the Rights Agent at its principal office in the City
            of Toronto or any other office of the Rights Agent designated for
            that purpose from time to time by the Corporation:


                                      -19-


<PAGE>   20
            (i)   the Rights Certificate evidencing such Rights, with an
                  Election to Exercise (an "ELECTION TO EXERCISE") substantially
                  in the form attached to the Rights Certificate appropriately
                  completed and duly executed by the holder or his executors or
                  administrators or other legal personal representatives or his
                  or their attorney duly appointed by an instrument in writing
                  in form and executed in a manner satisfactory to the Rights
                  Agent; and

            (ii)  payment by certified cheque, bank draft or money order payable
                  to the order of the Corporation, of a sum equal to the
                  Exercise Price multiplied by the number of Rights being
                  exercised and a sum sufficient to cover any transfer tax or
                  charge which may be payable in respect of any transfer
                  involved in the transfer or delivery of Rights Certificates or
                  the issuance or delivery of certificates for Common Shares in
                  a name other than that of the holder of the Rights being
                  exercised.

      (e)   Upon receipt of a Rights Certificate, with an Election to Exercise
            appropriately completed and duly executed, which does not indicate
            that such Right is void (or which is not otherwise void) as provided
            by Subsection 3.1(b), accompanied by payment as set forth in Clause
            2.2(d)(ii), the Rights Agent (unless otherwise instructed by the
            Corporation) will thereupon promptly:

            (i)   requisition from the transfer agent of the Common Shares
                  certificates for the number of Common Shares to be purchased
                  (the Corporation hereby irrevocably agreeing to authorize such
                  transfer agent to comply with all such requisitions);

            (ii)  after receipt of such Common Share certificates, deliver such
                  certificates to, or to the order of, the registered holder of
                  such Rights Certificate, registered in such name or names as
                  may be designated by such holder;

            (iii) when appropriate, requisition from the Corporation the amount
                  of cash, if any, to be paid in lieu of issuing fractional
                  Common Shares;

            (iv)  after receipt of such cash, deliver such cash to, or to the
                  order of, the registered holder of the Rights Certificate; and

            (v)   tender to the Corporation all payments received on exercise of
                  the Rights.

      (f)   If the holder of any Rights exercises less than all the Rights
            evidenced by such holder's Rights Certificate, a new Rights
            Certificate evidencing the Rights remaining unexercised will be
            issued by the Rights Agent to such holder or to such holder's duly
            authorized assigns.



                                      -20-


<PAGE>   21
      (g)   The Corporation covenants and agrees that it will:

            (i)   take all such action as may be necessary and within its power
                  to ensure that all Common Shares delivered upon exercise of
                  Rights shall, at the time of delivery of the certificates for
                  such Common Shares (subject to payment of the Exercise Price
                  and subject further to the provisions of Subsection 3.1(b)),
                  be duly and validly authorized, executed, issued and delivered
                  as fully paid and non-assessable;

            (ii)  take all such action as may reasonably be considered to be
                  necessary and within its power to comply with any applicable
                  requirements of the Corporations Act, the Securities Act and
                  the securities legislation of each of the other provinces and
                  territories of Canada, the 1933 Securities Act and the 1934
                  Exchange Act, and the rules and regulations thereunder or any
                  other applicable law, rule or regulation, in connection with
                  the issuance and delivery of the Rights Certificates and the
                  issuance of any Common Shares upon exercise of Rights;

            (iii) use reasonable efforts to cause all Common Shares issued upon
                  exercise of Rights to be listed upon issuance on the stock
                  exchange(s) or quotation system(s) where the Common Shares may
                  be listed at that time;

            (iv)  pay when due and payable, any and all Canadian and United
                  States federal, provincial and state taxes (not in the nature
                  of income or withholding taxes) and charges which may be
                  payable in respect of the original issuance or delivery of the
                  Rights Certificates or certificates for Common Shares issued
                  upon exercise of Rights, provided that the Corporation shall
                  not be required to pay any transfer tax or charge which may be
                  payable in respect of any transfer of Rights or the issuance
                  or delivery of certificates for Common Shares issued upon
                  exercise of Rights in a name other than that of the holder of
                  the Rights being exercised; and

            (v)   cause to be reserved and kept available out of its authorized
                  and unissued Shares the number of Shares that, as provided in
                  this Agreement, will from time to time be sufficient to permit
                  the exercise in full of all outstanding Rights.

2.3   ADJUSTMENTS TO EXERCISE PRICE; NUMBER OF RIGHTS

      (a)   The Exercise Price, the number and kind of securities subject to
            purchase upon exercise of each Right and the number of Rights
            outstanding are subject to adjustment from time to time as provided
            in this Section 2.3.


                                      -21-


<PAGE>   22
      (b)   In the event that the Corporation at any time after the Record Time
            and prior to the Expiration Time:

            (i)   declares or pays a dividend on the Common Shares payable in
                  Common Shares (or other securities exchangeable for or
                  convertible into or giving a right to acquire Common Shares)
                  other than pursuant to any dividend reinvestment plan;

            (ii)  subdivides or changes the then outstanding Common Shares into
                  a greater number of Common Shares;

            (iii) consolidates or changes the then outstanding Common Shares
                  into a smaller number of Common Shares; or

            (iv)  issues any Common Shares (or other securities exchangeable for
                  or convertible into or giving a right to acquire Common
                  Shares) in respect of, in lieu of, or in exchange for existing
                  Common Shares, except as otherwise provided in this Section
                  2.3,

            then  

                  A.    the Exercise Price shall be adjusted so that the
                        Exercise Price in effect after such adjustment will be
                        equal to the Exercise Price in effect immediately prior
                        to such adjustment divided by the number of Common
                        Shares (the "ADJUSTMENT FACTOR") that a holder of one
                        Common Share immediately prior to such dividend,
                        subdivision, change, consolidation or issuance would
                        hold thereafter as a result thereof (assuming the
                        exercise of all such exchange or conversion rights, if
                        any); and

                  B.    in a case to which clause (ii) or (iii) applies or if
                        clause (i) or (iv) applies to an issue of securities
                        made after the Separation Time, the number of Rights
                        outstanding shall be adjusted so that each Right held
                        prior to such adjustment will become that number of
                        Rights equal to the Adjustment Factor, and the adjusted
                        number of Rights will be deemed to be distributed among
                        the Common Shares with respect to which the original
                        Rights were associated (if they remain outstanding) and
                        the shares issued in respect of such dividend,
                        subdivision, change, consolidation or issuance, so that
                        each such Common Share will have exactly one Right
                        associated with it.

            In the event the Corporation shall at any time after the Record Time
            and prior to the Separation Time issue any Common Shares otherwise
            than in a transaction referred


                                      -22-


<PAGE>   23
            to in the preceding paragraph, each such Common Share so issued
            shall automatically have one new Right associated with it, which
            Right shall be evidenced by the certificate representing such share.

      (c)   In the event that the Corporation at any time after the Record Time
            and prior to the Expiration Time fixes a record date for the making
            of a distribution to substantially all holders of Common Shares of
            rights or warrants entitling them (for a period expiring within 45
            calendar days after such record date) to subscribe for or purchase
            Common Shares (or securities convertible into or exchangeable for or
            carrying a right to purchase or subscribe for Common Shares) at a
            price per Common Share (or, in the case of a security convertible
            into or exchangeable for or carrying a right to purchase or
            subscribe for Common Shares, having a conversion, exchange or
            exercise price per share (including the price required to be paid to
            purchase such convertible or exchangeable security or right)) less
            than 90 percent of the Market Price per Common Share on such record
            date, the Exercise Price shall be adjusted. The Exercise Price in
            effect after such record date will equal the Exercise Price in
            effect immediately prior to such record date multiplied by a
            fraction, of which the numerator shall be the number of Common
            Shares outstanding on such record date plus the number of Common
            Shares which the aggregate offering price of the total number of
            Common Shares so to be offered (and/or the aggregate initial
            conversion, exchange or exercise price of the convertible or
            exchangeable securities or rights so to be offered, including the
            price required to be paid to purchase such convertible or
            exchangeable securities or rights) would purchase at such Market
            Price per Common Share and of which the denominator shall be the
            number of Common Shares outstanding on such record date plus the
            number of additional Common Shares to be offered for subscription or
            purchase (or into which the convertible or exchangeable securities
            or rights to be so offered are initially convertible, exchangeable
            or exercisable). In case such subscription price may be paid in a
            consideration part or all of which will be in a form other than
            cash, the value of such consideration shall be as determined by the
            Board of Directors. To the extent that such rights or warrants are
            not exercised prior to the expiration thereof, the Exercise Price
            shall be readjusted on the expiration thereof to the Exercise Price
            which would then be in effect based on the number of Common Shares
            (or securities convertible into or exchangeable for Common Shares)
            actually issued upon the exercise of such rights. For purposes of
            this Agreement, the granting of the right to purchase Common Shares
            (whether from treasury shares or otherwise) pursuant to any dividend
            reinvestment plan and/or any share purchase plan providing for the
            reinvestment of dividends or interest payable on securities of the
            Corporation and/or the investment of periodic optional payments
            and/or employee benefit, stock option or similar plans (so long as
            such right to purchase is in no case evidenced by the delivery of
            rights or warrants by the Corporation) shall not be deemed to
            constitute an issue of rights or warrants by the Corporation;
            provided, however, that, in the case of any dividend reinvestment
            plan or share purchase plan, the right to purchase Common Shares is
            at a price per share


                                      -23-


<PAGE>   24
            of not less than 90 percent of the current market price per share
            (determined in accordance with such plans) of the Common Shares.

      (d)   In the event that the Corporation at any time after the Record Time
            and prior to the Expiration Time fixes a record date for the making
            of a distribution to substantially all holders of Common Shares of
            evidences of indebtedness or assets (other than a Regular Periodic
            Cash Dividend or a dividend paid in Common Shares but including any
            dividend payable in securities other than a dividend or distribution
            referred to in Subsection 2.3(b)(i) or 2.3(b)(iv)) or rights or
            warrants entitling them to subscribe for or purchase Common Shares
            (or securities convertible into or exchangeable for or carrying a
            right to purchase or subscribe for Common Shares) at a price per
            Common Share (or, in the case of a security convertible into or
            exchangeable for or carrying a right to purchase or subscribe for
            Common Shares, having a conversion, exchange or exercise price per
            share (including the price required to be paid to purchase such
            convertible or exchangeable security or right)) less than 90 percent
            of the Market Price per Common Share on such record date (excluding
            rights or warrants referred to in Subsection 2.3(c)), the Exercise
            Price in effect after such record date shall be equal to the
            Exercise Price in effect immediately prior to such record date less
            the fair market value (as determined by the Board of Directors) of
            the portion of the assets, evidences of indebtedness, rights or
            warrants so to be distributed applicable to a Common Share.

      (e)   Each adjustment made pursuant to this Section 2.3 shall be made as
            of:

            (i)   the record or effective date for the applicable dividend,
                  subdivision, change, consolidation or issuance, in the case of
                  an adjustment made pursuant to Subsection 2.3(b); and

            (ii)  the record date for the applicable dividend or distribution,
                  in the case of an adjustment made pursuant to Subsection
                  2.3(c) or (d).

      (f)   In the event that the Corporation shall at any time after the Record
            Time and prior to the Separation Time issue any shares of capital
            stock (other than Common Shares), or rights or warrants to subscribe
            for or purchase any such capital stock, or securities convertible
            into or exchangeable for any such capital stock, in a transaction
            referred to in Clauses 2.3(b)(i) or (iv), if the Board of Directors
            determines that the adjustments contemplated by Subsections 2.3(b),
            (c) and (d) in connection with such transaction will not
            appropriately protect the interests of the holders of Rights, the
            Corporation may determine what other adjustments to the Exercise
            Price, number of Rights and/or securities purchasable upon exercise
            of Rights would be appropriate and, notwithstanding Subsections
            2.3(b), (c) and (d), such adjustments, rather than the adjustments
            contemplated by Subsections 2.3(b), (c) and (d), shall be made. The


                                      -24-


<PAGE>   25
            Corporation and the Rights Agent shall amend this Agreement as
            appropriate to provide for such adjustments.

      (g)   Notwithstanding anything herein to the contrary, no adjustment of
            the Exercise Price shall be required unless such adjustment would
            require an increase or decrease of at least one per cent in such
            Exercise Price; provided, however, that any adjustments which by
            reason of this Subsection 2.3(g) are not required to be made shall
            be carried forward and taken into account in any subsequent
            adjustment. All adjustments made pursuant to this Section 2.3 shall
            be made to the nearest cent or to the nearest one ten-thousandth of
            a Common Share or a Right, as the case may be.

      (h)   All Rights originally issued by the Corporation subsequent to any
            adjustment made to an Exercise Price hereunder shall evidence the
            right to purchase, at the adjusted Exercise Price, the number of
            Common Shares purchasable from time to time hereunder upon exercise
            of the Rights, all subject to further adjustment as provided herein.

      (i)   Unless the Corporation shall have exercised its election, as
            provided in Subsection 2.3(j), upon each adjustment of an Exercise
            Price as a result of the calculations made in Subsections 2.3(c) and
            (d), each Right outstanding immediately prior to the making of such
            adjustment shall thereafter evidence the right to purchase, at the
            adjusted Exercise Price, that number of Common Shares obtained by:

            (i)   multiplying (A) the number of Common Shares covered by a Right
                  immediately prior to this adjustment, by (B) the relevant
                  Exercise Price in effect immediately prior to such adjustment
                  of the relevant Exercise Price; and

            (ii)  dividing the product so obtained by the relevant Exercise
                  Price in effect immediately after such adjustment of the
                  relevant Exercise Price.

      (j)   The Corporation may elect prior to or after the date of any
            adjustment of an Exercise Price to adjust the number of Rights, in
            lieu of any adjustment in the number of Common Shares purchasable
            upon the exercise of a Right. Each of the Rights outstanding after
            the adjustment in the number of Rights shall be exercisable for the
            number of Common Shares for which a Right was exercisable
            immediately prior to such adjustment. Each Right held of record
            prior to such adjustment of the number of Rights shall become the
            number of Rights obtained by dividing the relevant Exercise Price in
            effect immediately prior to adjustment of the relevant Exercise
            Price by the relevant Exercise Price in effect immediately after
            adjustment of the relevant Exercise Price. The Corporation shall
            make a public announcement of its election to adjust the number of
            Rights, indicating the record date for the adjustment, and, if known
            at the time, the amount of the adjustment to be made. This record
            date


                                      -25-


<PAGE>   26
            may be the date on which the relevant Exercise Price is adjusted or
            any day thereafter, but, if the Rights Certificates have been
            issued, shall be at least 10 calendar days later than the date of
            the public announcement. If Rights Certificates have been issued,
            upon each adjustment of the number of Rights pursuant to this
            Subsection 2.3(j), the Corporation shall, as promptly as
            practicable, cause to be distributed to holders of record of Rights
            on such record date, Rights Certificates evidencing, subject to
            Section 5.5, the additional Rights to which such holders shall be
            entitled as a result of such adjustment, or, at the option of the
            Corporation, shall cause to be distributed to such holders of record
            in substitution and replacement for the Rights Certificates held by
            such holders prior to the date of adjustment, and upon surrender
            thereof, if required by the Corporation, new Rights Certificates
            evidencing all the Rights to which such holders shall be entitled
            after such adjustment. Rights Certificates so to be distributed
            shall be issued, executed and countersigned in the manner provided
            for herein and may bear, at the option of the Corporation, the
            relevant adjusted Exercise Price and shall be registered in the
            names of holders of record of Rights Certificates on the record date
            specified in the public announcement.

      (k)   Irrespective of any adjustment or change in the Exercise Price or
            the number of securities issuable upon exercise of the Rights, the
            Rights Certificates theretofore and thereafter issued may continue
            to express the Exercise Price per Common Share and the number of
            Common Shares so issuable which were expressed in the initial Rights
            Certificates issued hereunder.

      (l)   In any case in which this Section 2.3 shall require that an
            adjustment in an Exercise Price be made effective as of a record
            date for a specified event, the Corporation may elect to defer until
            the occurrence of such event the issuance to the holder of any Right
            exercised after such record date of the number of Common Shares and
            other securities of the Corporation, if any, issuable upon such
            exercise over and above the number of Common Shares and other
            securities of the Corporation, if any, issuable upon such exercise
            on the basis of the relevant Exercise Price in effect prior to such
            adjustment; provided, however, that the Corporation shall deliver to
            such holder a due bill or other appropriate instrument evidencing
            such holder's right to receive such additional Common Shares
            (fractional or otherwise) or other securities upon the occurrence of
            the event requiring such adjustment.

      (m)   Notwithstanding anything in this Section 2.3 to the contrary, the
            Corporation shall be entitled to make such reductions in the
            Exercise Price, in addition to those adjustments expressly required
            by this Section 2.3, as and to the extent that in its good faith
            judgment the Board of Directors shall determine to be advisable in
            order that any (i) subdivision or consolidation of the Common
            Shares, (ii) issuance wholly for cash of any Common Shares at less
            than the applicable Market Price, (iii) issuance wholly for cash of
            any Common Shares or securities that by their terms are exchangeable
            for or convertible into or give a right to acquire Common Shares,
            (iv)


                                      -26-


<PAGE>   27
            stock dividends or (v) issuance of rights, options or warrants
            referred to in this Section 2.3, hereafter made by the Corporation
            to holders of its Common Shares, subject to applicable taxation
            laws, shall not be taxable to such shareholders.

      (n)   The Corporation covenants and agrees that, after the Separation
            Time, it will not, except as permitted by Section 5.1 or 5.4, take
            (or permit any Subsidiary of the Corporation to take) any action if
            at the time such action is taken it is reasonably foreseeable that
            such action will diminish substantially or otherwise eliminate the
            benefits intended to be afforded by the Rights.

      (o)   If an event occurs which would require an adjustment under both this
            Section 2.3 and Section 3.1, the adjustment provided for in this
            Section 2.3 shall be in addition to and shall be made prior to, any
            adjustment required pursuant to Section 3.1.

      (p)   Whenever an adjustment to the Exercise Price or a change in the
            securities purchasable upon exercise of the Rights is made pursuant
            to this Section 2.3, the Corporation shall promptly:

            (i)   file with the Rights Agent and with the transfer agent for the
                  Common Shares a certificate specifying the particulars of such
                  adjustment or change; and

            (ii)  cause notice of the particulars of such adjustment or change
                  to be given to the holders of the Rights.

            Failure to file such certificate or to cause such notice to be given
            as aforesaid, or any defect therein, shall not affect the validity
            of any such adjustment or change.

2.4   DATE ON WHICH EXERCISE IS EFFECTIVE

        Each Person in whose name any certificate for Common Shares is issued
upon the exercise of Rights shall for all purposes be deemed to have become the
holder of record of the Common Shares represented thereby on, and such
certificate shall be dated, the date upon which the Rights Certificate
evidencing such Rights was duly surrendered (together with an appropriately
completed and duly executed Election to Exercise) and payment of the Exercise
Price for such Rights (and any applicable transfer taxes or charges payable by
such Person hereunder) was made in accordance with Subsection 2.2(d); provided,
however, that if the date of such surrender and payment is a date upon which the
Common Share transfer books of the Corporation are closed, such Person shall be
deemed to have become the holder of record of such shares on, and such
certificate shall be dated, the next succeeding Business Day on which the Common
Share transfer books of the Corporation are open.


                                      -27-


<PAGE>   28
2.5     EXECUTION, AUTHENTICATION, DELIVERY AND DATING OF RIGHTS CERTIFICATES

        (a)     The Rights Certificates shall be executed on behalf of the
                Corporation by its Chief Executive Officer and its Chief
                Financial Officer. The signature of these officers on the Rights
                Certificates may be manual or facsimile. Rights Certificates
                bearing the manual or facsimile signatures of individuals who
                were at any time the proper officers of the Corporation shall
                bind the Corporation, notwithstanding that such individuals or
                any of them have ceased to hold such offices prior to the
                countersignature and delivery of such Rights Certificates.

        (b)     Promptly following the Separation Time, the Corporation will
                notify the Rights Agent of such Separation Time and will deliver
                Rights Certificates executed by the Corporation to the Rights
                Agent for countersignature and a disclosure statement describing
                the Rights, and the Rights Agent will manually countersign such
                Rights Certificates and deliver such Rights Certificates and
                statement to the holders of the Rights pursuant to Subsection
                2.2(c). No Rights Certificate shall be valid for any purpose
                until countersigned by the Rights Agent as aforesaid.

        (c)     Each Rights Certificate shall be dated the date of
                countersignature thereof.

2.6     REGISTRATION, REGISTRATION OF TRANSFER AND EXCHANGE

        (a)     After the Separation Time, the Corporation will cause to be kept
                a register (the "RIGHTS REGISTER") in which, subject to such
                reasonable regulations as it may prescribe, the Corporation will
                provide for the registration and transfer of Rights. The Rights
                Agent is hereby appointed "Rights Registrar" for the purpose of
                maintaining the Rights Register for the Corporation and
                registering Rights and transfers and exchanges of Rights as
                herein provided. In the event that the Rights Agent shall cease
                to be the Rights Registrar, the Rights Agent will have the right
                to examine the Rights Register at all reasonable times.

        (b)     After the Separation Time and prior to the Expiration Time, upon
                surrender for registration of transfer or exchange of any Rights
                Certificate, and subject to the provisions of Subsection 2.6(d)
                and 3.1(b), the Corporation will execute, and the Rights Agent
                will countersign, deliver and register, in the name of the
                holder or the designated transferee or transferees, as required
                pursuant to the holder's instructions, one or more new Rights
                Certificates evidencing the same aggregate number of Rights as
                did the Rights Certificates so surrendered.

        (c)     All Rights issued upon any registration of transfer or exchange
                of Rights Certificates shall be the valid obligations of the
                Corporation, and such Rights shall be entitled to the same
                benefits under this Agreement as the Rights surrendered upon
                such registration of transfer or exchange.


                                      -28-


<PAGE>   29
        (d)     Every Rights Certificate surrendered for registration of
                transfer or exchange shall be duly endorsed, or be accompanied
                by a written instrument of transfer in form satisfactory to the
                Corporation or the Rights Agent, as the case may be, duly
                executed by the holder thereof or such holder's attorney duly
                authorized in writing. As a condition to the issuance of any new
                Rights Certificate under this Section 2.6, the Corporation may
                require the payment of a sum sufficient to cover any tax or
                other governmental charge that may be imposed in relation
                thereto and any other expenses (including the fees and expenses
                of the Rights Agent) connected therewith.

2.7     MUTILATED, DESTROYED, LOST AND STOLEN RIGHTS CERTIFICATES

        (a)     If any mutilated Rights Certificate is surrendered to the Rights
                Agent prior to the Expiration Time, the Corporation shall
                execute and the Rights Agent shall countersign and deliver in
                exchange therefor a new Rights Certificate evidencing the same
                number of Rights as did the Rights Certificate so surrendered.

        (b)     If there shall be delivered to the Corporation and the Rights
                Agent prior to the Expiration Time (i) evidence to their
                satisfaction of the destruction, loss or theft of any Rights
                Certificate and (ii) such security or indemnity as may be
                required by them to save each of them and any of their agents
                harmless, then, in the absence of notice to the Corporation or
                the Rights Agent that such Rights Certificate has been acquired
                by a bona fide purchaser, the Corporation shall execute and upon
                its request the Rights Agent shall countersign and deliver, in
                lieu of any such destroyed, lost or stolen Rights Certificate, a
                new Rights Certificate evidencing the same number of Rights as
                did the Rights Certificate so destroyed, lost or stolen.

        (c)     As a condition to the issuance of any new Rights Certificate
                under this Section 2.7, the Corporation may require the payment
                of a sum sufficient to cover any tax or other governmental
                charge that may be imposed in relation thereto and any other
                expenses (including the fees and expenses of the Rights Agent)
                connected therewith.

        (d)     Every new Rights Certificate issued pursuant to this Section 2.7
                in lieu of any destroyed, lost or stolen Rights Certificate
                shall evidence a contractual obligation of the Corporation,
                whether or not the destroyed, lost or stolen Rights Certificate
                shall be at any time enforceable by anyone, and shall be
                entitled to all the benefits of this Agreement equally and
                proportionately with any and all other Rights duly issued
                hereunder.

2.8     PERSONS DEEMED OWNERS

        Prior to due presentment of a Rights Certificate (or, prior to the
Separation Time, the associated Common Share certificate) for registration of
transfer, the Corporation and any agent of the Corporation or, if so authorized
by the Corporation, the Rights Agent may deem and treat the


                                      -29-


<PAGE>   30
person in whose name such Rights Certificate (or, prior to the Separation Time,
such Common Share certificate) is registered as the absolute owner thereof and
of the Rights evidenced thereby for all purposes whatsoever. As used in this
Agreement, unless the context otherwise requires, the term "holder" of any
Rights means the registered holder of such Rights (or, prior to the Separation
Time, the associated Common Shares).

2.9     DELIVERY AND CANCELLATION OF CERTIFICATES

        All Rights Certificates surrendered upon exercise or for redemption, or
for registration of transfer or exchange shall, if surrendered to any person
other than the Rights Agent, be delivered to the Rights Agent and, in any case,
shall be promptly cancelled by the Rights Agent. The Corporation may at any time
deliver to the Rights Agent for cancellation any Rights Certificates previously
countersigned and delivered hereunder which the Corporation may have acquired in
any manner whatsoever, and all Rights Certificates so delivered shall be
promptly cancelled by the Rights Agent. No Rights Certificate shall be
countersigned in lieu of or in exchange for any Rights Certificates cancelled as
provided in this Section 2.9, except as expressly permitted by this Agreement.
The Rights Agent shall destroy all cancelled Rights Certificates and deliver a
certificate of destruction to the Corporation.

2.10    AGREEMENT OF RIGHTS HOLDERS

        Every holder of Rights, by accepting such Rights, consents and agrees
with the Corporation and the Rights Agent and with every other holder of Rights
that:

        (a)     such holder shall be bound by and subject to the provisions of
                this Agreement, as amended from time to time in accordance with
                the terms hereof, in respect of all Rights held;

        (b)     prior to the Separation Time, each Right will be transferable
                only together with, and will be transferred by a transfer of,
                the associated Common Share;

        (c)     after the Separation Time, the Rights will be transferable only
                on the Rights Register as provided herein;

        (d)     prior to due presentment of a Rights Certificate (or, prior to
                the Separation Time, the associated Common Share certificate)
                for registration of transfer, the Corporation and any agent of
                the Corporation or, if so authorized by the Corporation, the
                Rights Agent may deem and treat the person in whose name the
                Rights Certificate (or, prior to the Separation Time, the
                associated Common Share certificate) is registered as the
                absolute owner thereof and of the Rights evidenced thereby
                (notwithstanding any notations of ownership or writing on such
                Rights Certificate or the associated Common Share certificate
                made by anyone other than the Corporation or the Rights


                                      -30-


<PAGE>   31
                Agent) for all purposes whatsoever, and neither the Corporation
                nor the Rights Agent shall be affected by any notice to the
                contrary;

        (e)     such holder is not entitled to receive any fractional Rights or
                fractional Common Shares upon the exercise of Rights;

        (f)     without the approval of any holder of Rights and upon the sole
                authority of the Board of Directors, this Agreement may be
                supplemented or amended from time to time as provided herein;
                and

        (g)     notwithstanding anything in this Agreement to the contrary,
                neither the Corporation nor the Rights Agent shall have any
                liability to any holder of a Right or any other Person as a
                result of its inability to perform any of its obligations under
                this Agreement by reason of any preliminary or permanent
                injunction or other order, decree or ruling issued by a court of
                competent jurisdiction or by a governmental, regulatory or
                administrative agency or commission, or any statute, rule,
                regulation or executive order promulgated or enacted by a
                governmental authority, prohibiting or otherwise restraining
                performance of such obligations.


                     ARTICLE 3 -- ADJUSTMENTS TO THE RIGHTS

3.1     FLIP-IN EVENT

        (a)     Subject to Section 3.1(b) and Subsections 5.1(d) and 5.1(e), and
                except as provided below, if prior to the Expiration Time a
                Flip-in Event shall occur, each Right shall constitute,
                effective at the Close of Business on the 10th day after the
                Stock Acquisition Date, the right to purchase from the
                Corporation, upon exercise thereof in accordance with the terms
                hereof, that number of Common Shares having an aggregate Market
                Price on the date of consummation or occurrence of such Flip-in
                Event equal to twice the Exercise Price for an amount in cash
                equal to the Exercise Price (such Right to be appropriately
                adjusted in a manner analogous to the applicable adjustment
                provided for in Section 2.3 in the event that, after such date
                of consummation or occurrence, or event, an event of a type
                analogous to any of the events described in Section 2.3 shall
                have occurred with respect to such Common Shares).

        (b)     Notwithstanding anything to the contrary in this Agreement, upon
                the occurrence of any Flip-in Event, any Rights that are or were
                Beneficially Owned on or after the earlier of the Separation
                Time or the Stock Acquisition Date by:

                (i)     (A)     an Acquiring Person;


                                      -31-


<PAGE>   32
                        (B)     any Affiliate or Associate of an Acquiring
                                Person;

                        (C)     any Person acting jointly or in concert with an
                                Acquiring Person or any of its Affiliates;

                        (D)     any other Person whose securities are deemed to
                                be Beneficially Owned by an Acquiring Person

                        (each such Person being herein referred to as the
                        "INELIGIBLE SHAREHOLDER"); or

                (ii)    a transferee, direct or indirect, of an Ineligible
                        Shareholder who becomes a transferee in a transfer,
                        whether or not for consideration, that the Board of
                        Directors has determined is part of a plan, arrangement
                        or scheme of an Ineligible Shareholder that has the
                        purpose or effect of avoiding Clause 3.1(b)(i),

                shall become null and void without any further action, and any
                holder of such Rights (including a transferee of, or other
                successor to, such Rights, whether directly or indirectly) shall
                thereafter have no right to exercise such Rights under any
                provision of this Agreement and shall not have thereafter any
                right whatsoever with respect to such Rights, whether under any
                provision of this Agreement or otherwise. The holder of any
                Rights represented by a Rights Certificate which is submitted to
                the Rights Agent upon exercise or for registration of transfer
                or exchange which does not contain the necessary certifications
                set forth in the Rights Certificate establishing that such
                Rights are not void under this Subsection 3.1(b), shall be
                deemed to be an Acquiring Person or other Ineligible Shareholder
                for the purposes of this Subsection 3.1(b) and such Rights shall
                become null and void.

        (c)     Any Rights Certificates that represent Rights Beneficially Owned
                by a Person described in either Clause (i) or (ii) of Subsection
                3.1(b) or transferred to any nominee of any such Person, and any
                Rights Certificate issued upon transfer, exchange, replacement
                or adjustment of any other Rights Certificate referred to in
                this sentence, shall contain the following legend:

                        "The Rights represented by this Rights Certificate were
                        issued to a Person who was an Acquiring Person or an
                        Affiliate or an Associate of an Acquiring Person or
                        other Ineligible Shareholder (as such terms are defined
                        in the Rights Agreement), including a Person, or an
                        Affiliate or Associate of a Person, who was acting
                        jointly or in concert with any of them or any other
                        Person whose securities are deemed to be Beneficially
                        Owned by such Acquiring Person. This Rights Certificate
                        and the Rights represented hereby shall become


                                      -32-


<PAGE>   33
                        void in the circumstances specified in Subsection 3.1(b)
                        of the Rights Agreement."

                Provided, however, that the Rights Agent shall not be under any
                responsibility to ascertain the existence of facts that would
                require the imposition of such legend but shall impose such
                legend only if instructed to do so by the Corporation in writing
                of if a holder fails to certify upon transfer or exchange in the
                space provided on the Rights Certificate that such holder is not
                a Person described in such legend.

        (d)     From and after the Separation Time, the Corporation shall do all
                such acts and things as shall be necessary and within its power
                to ensure compliance with the provisions of this Section 3.1
                including, without limitation, all such acts and things as may
                be required to satisfy the requirements of the Corporations Act
                and the Securities Act and any other applicable laws in respect
                of the issue of Common Shares upon the exercise of Rights in
                accordance with this Agreement.

3.2     EXCHANGE OPTION

        (a)     In the event that the Board of Directors determines that
                conditions exist which would eliminate or otherwise materially
                diminish in any respect the benefits intended to be afforded to
                the holders of Rights pursuant to this Agreement, the Board of
                Directors may, at its option and without seeking the approval of
                the holders of Common Shares or Rights, at any time after a
                Flip-in Event has occurred, authorize the Corporation to issue
                or deliver in respect of each Right which is not void pursuant
                to Subsection 3.1(b), either:

                (i)     in return for the Exercise Price and the Right, cash,
                        debt or equity securities or other assets (or a
                        combination thereof) having a cash value equal to twice
                        the Exercise Price; or

                (ii)    in return for the Right and without further charge,
                        subject to any amounts that may be required to be paid
                        under applicable law, cash, debt or equity securities or
                        other assets (or a combination thereof) having a cash
                        value equal to the Exercise Price,

                in full and final settlement of all rights attaching to the
                Rights, where in either case the value of such debt or equity
                securities or other assets shall be determined by the Board of
                Directors who may rely upon the advice of a nationally
                recognized investment dealer or investment banker selected by
                the Board of Directors. To the extent that the Board of
                Directors determines that some action need be taken pursuant to
                this Section 3.2, the Board of Directors may suspend the
                exercisability of the Rights for a period of up to 90 days
                following the date of the occurrence of the relevant Flip-in
                Event in order to decide the appropriate form of distribution to
                be


                                      -33-


<PAGE>   34
                made and to determine the value thereof. In the event of any
                such suspension, the Corporation shall notify the Rights Agent
                and issue as promptly as practicable a public announcement
                stating that the exercisability of the Rights has been
                temporarily suspended.

        (b)     If the Board of Directors authorizes the exchange of debt or
                equity securities or other assets (or a combination thereof) for
                Rights pursuant to Subsection 3.2(a), then, without any further
                action or notice, the right to exercise the Rights will
                terminate and the only right thereafter of a holder of Rights
                shall be to receive such debt or equity securities or other
                assets (or a combination thereof) in accordance with the
                exchange formula authorized by the Board of Directors. Within 10
                Business Days after the Board of Directors has authorized the
                exchange of debt or equity securities or other assets (or a
                combination thereof) for Rights pursuant to Subsection 3.2(a),
                the Corporation shall give notice of such exchange to the
                holders of such Rights. Each such notice of exchange will state
                the method by which the exchange of debt or equity securities or
                other assets (or a combination thereof) for Rights will be
                effected.

        (c)     The Corporation shall not be required to issue fractions of
                securities or to distribute certificates evidencing fractional
                securities. In lieu of issuing such fractional securities, there
                shall be paid to the registered holders of Rights to whom such
                fractional securities would otherwise be issuable, an amount in
                cash equal to the same fraction of the Market Price of a whole
                security.

3.3     FIDUCIARY DUTIES OF THE BOARD OF DIRECTORS OF THE CORPORATION

        For clarification it is understood that nothing contained in this
Article 3 shall be considered to affect the obligations of the members of the
Board of Directors to exercise their fiduciary duties. Without limiting the
generality of the foregoing, nothing contained herein shall be construed to
suggest or imply that the Board of Directors shall not be entitled to recommend
that holders of the Voting Shares of the Corporation reject or accept any
Take-over Bid or take any other action (including, without limitation, the
commencement, prosecution, defence or settlement of any litigation and the
submission of additional or alternative Take-over Bids or other proposals to the
Special Meeting) with respect to any Take-over Bid that the Board of Directors
believes is necessary or appropriate in the exercise of the fiduciary duties of
its members.




                                      -34-


<PAGE>   35
                          ARTICLE 4 -- THE RIGHTS AGENT

4.1     GENERAL

        (a)     The Corporation hereby appoints the Rights Agent to act as agent
                for the Corporation and the holders of Rights in accordance with
                the terms and conditions hereof, and the Rights Agent hereby
                accepts such appointment. The Corporation may from time to time
                appoint such Co-Rights Agents as it may deem necessary or
                desirable subject to the prior approval of the Rights Agent. In
                the event the Corporation appoints one or more Co-Rights Agents,
                the respective duties of the Rights Agents and Co-Rights Agents
                shall be as the Corporation may determine with the approval of
                the Rights Agent. The Corporation agrees to pay to the Rights
                Agent reasonable compensation for all services rendered by it
                hereunder (as per the attached Fee Schedule) and, from time to
                time, on demand of the Rights Agent, its reasonable expenses and
                counsel fees and other disbursements incurred in the
                administration and execution of this Agreement and the exercise
                and performance of its duties hereunder (including the fees and
                disbursements of any expert or advisor retained by the Rights
                Agent with the approval of the Corporation). The Corporation
                also agrees to indemnify the Rights Agent, its officers,
                directors and employees for, and to hold them harmless against,
                any loss, liability, or expense, incurred without negligence,
                bad faith or wilful misconduct on the part of the Rights Agent,
                for anything done or omitted by the Rights Agent in connection
                with the acceptance and administration of this Agreement,
                including the costs and expenses of defending against any claim
                of liability, which right to indemnification will survive the
                termination of this Agreement or the resignation or removal of
                the Rights Agent. The Corporation shall inform the Rights Agent
                in a reasonably timely manner of events which may materially
                affect the administration of this Agreement by the Rights Agent
                and at any time, upon request, shall provide to the Rights Agent
                an incumbency certificate with respect to the then current
                directors of the Corporation.

        (b)     The Rights Agent shall be protected and shall incur no liability
                for or in respect of any action taken, suffered or omitted by it
                in connection with its administration of this Agreement in
                reliance upon any certificate for Common Shares, Rights
                Certificate, certificate for other securities of the
                Corporation, instrument of assignment or transfer, power of
                attorney, endorsement, affidavit, letter, notice, direction,
                consent, certificate, statement, or other paper or document
                believed by it to be genuine and to be signed, executed and,
                where necessary, verified or acknowledged, by the proper Person
                or Persons.

4.2     MERGER OR CONSOLIDATION OR CHANGE OF NAME OF RIGHTS AGENT

        (a)     Any corporation into which the Rights Agent or any successor
                Rights Agent may be merged or amalgamated or with which it may
                be consolidated, or any corporation


                                      -35-


<PAGE>   36
                resulting from any merger, amalgamation or consolidation to
                which the Rights Agent or any successor Rights Agent is a party,
                or any corporation succeeding to the shareholder or stockholder
                services business of the Rights Agent or any successor Rights
                Agent, will be the successor to the Rights Agent under this
                Agreement without the execution or filing of any paper or any
                further act on the part of any of the parties hereto, provided
                that such corporation would be eligible for appointment as a
                successor Rights Agent under the provisions of Section 4.4
                hereof. In case at the time such successor Rights Agent succeeds
                to the agency created by this Agreement any of the Rights
                Certificates have been countersigned but not delivered, any such
                successor Rights Agent may adopt the countersignature of the
                predecessor Rights Agent and deliver such Rights Certificates so
                countersigned; and in case at that time any of the Rights
                Certificates have not been countersigned, any successor Rights
                Agent may countersign such Rights Certificates either in the
                name of the predecessor Rights Agent or in the name of the
                successor Rights Agent; and in all such cases such Rights
                Certificates will have the full force provided in the Rights
                Certificates and in this Agreement.

        (b)     In case at any time the name of the Rights Agent is changed and
                at such time any of the Rights Certificates shall have been
                countersigned but not delivered, the Rights Agent may adopt the
                countersignature under its prior name and deliver Rights
                Certificates so countersigned; and in case at that time any of
                the Rights Certificates shall not have been countersigned, the
                Rights Agent may countersign such Rights Certificates either in
                its prior name or in its changed name; and in all such cases
                such Rights Certificates shall have the full force provided in
                the Rights Certificates and in this Agreement.

4.3     DUTIES OF RIGHTS AGENT

        The Rights Agent undertakes the duties and obligations imposed by this
Agreement upon the following terms and conditions, by all of which the
Corporation and the holders of Rights Certificates, by their acceptance thereof,
shall be bound:

        (a)     The Rights Agent may retain and consult with legal counsel (who
                may be legal counsel for the Corporation), and the opinion of
                such counsel will be full and complete authorization and
                protection to the Rights Agent as to any action taken or omitted
                by it in good faith and in accordance with such opinion; the
                Rights Agent may also, with the approval of the Corporation
                (where such approval may reasonably be obtained and such
                approval not to be unreasonably withheld), consult with such
                other experts as the Rights Agent shall consider necessary or
                appropriate to properly carry out the duties and obligations
                imposed under this Agreement and the Rights Agent shall be
                entitled to rely in good faith on the advice of any such expert;


                                      -36-


<PAGE>   37
        (b)     Whenever in the performance of its duties under this Agreement
                the Rights Agent deems it necessary or desirable that any fact
                or matter be proved or established by the Corporation prior to
                taking or suffering any action hereunder, such fact or matter
                (unless other evidence in respect thereof be herein specifically
                prescribed) may be deemed to be conclusively proved and
                established by a certificate signed by a person reasonably
                believed by the Rights Agent to be a senior officer of the
                Corporation and delivered to the Rights Agent; and such
                certificate will be full authorization to the Rights Agent for
                any action taken or suffered in good faith by it under the
                provisions of this Agreement in reliance upon such certificate;

        (c)     The Rights Agent will be liable hereunder only for its own
                negligence, bad faith or wilful misconduct;

        (d)     The Rights Agent will not be liable for or by reason of any of
                the statements of fact or recitals contained in this Agreement
                or in the certificates for Common Shares or the Rights
                Certificates (except its countersignature thereof) or be
                required to verify the same, but all such statements and
                recitals are and will be deemed to have been made by the
                Corporation only;

        (e)     The Rights Agent will not be under any responsibility in respect
                of the validity of this Agreement or the execution and delivery
                hereof (except the due authorization, execution and delivery
                hereof by the Rights Agent) or in respect of the validity or
                execution of any Common Share certificate or Rights Certificate
                (except its countersignature thereof); nor will it be
                responsible for any breach by the Corporation of any covenant or
                condition contained in this Agreement or in any Rights
                Certificate; nor will it be responsible for any change in the
                exercisability of the Rights (including the Rights becoming void
                pursuant to Subsection 3.1(b)) or any adjustment required under
                the provisions of Section 2.3 or responsible for the manner,
                method or amount of any such adjustment or the ascertaining of
                the existence of facts that would require any such adjustment
                (except with respect to the exercise of Rights after receipt of
                the certificate contemplated by Subsection 2.3(p) hereof
                describing any such adjustment); nor will it by any act
                hereunder be deemed to make any representation or warranty as to
                the authorization of any Common Shares to be issued pursuant to
                this Agreement or any Rights or as to whether any Common Shares
                will, when issued, be duly and validly authorized, executed,
                issued and delivered and fully paid and non-assessable;

        (f)     The Corporation agrees that it will perform, execute,
                acknowledge and deliver or cause to be performed, executed,
                acknowledged and delivered all such further and other acts,
                instruments and assurances as may reasonably be required by the
                Rights Agent for the carrying out or performing by the Rights
                Agent of the provisions of this Agreement;


                                      -37-


<PAGE>   38
        (g)     The Rights Agent is hereby authorized and directed to accept
                instructions with respect to the performance of its duties
                hereunder from any Person designated in writing by the
                Corporation, and to apply to such persons for advice or
                instructions in connection with its duties and it shall not be
                liable for any action taken or suffered by it in good faith in
                accordance with instructions of any such person;

        (h)     The Rights Agent and any shareholder or stockholder, director,
                officer or employee of the Rights Agent may buy, sell or deal in
                Common Shares, Rights or other securities of the Corporation or
                become pecuniarily interested in any transaction in which the
                Corporation may be interested, or contract with or lend money to
                the Corporation or otherwise act as fully and freely as though
                it were not Rights Agent under this Agreement. Nothing herein
                shall preclude the Rights Agent from acting in any other
                capacity for the Corporation or for any other legal entity; and

        (i)     The Rights Agent may execute and exercise any of the rights or
                powers hereby vested in it or perform any duty hereunder either
                itself or by or through its attorneys or agents, and the Rights
                Agent will not be answerable or accountable for any act,
                default, neglect or misconduct of any such attorneys or agents
                or for any loss to the Corporation resulting from any such act,
                default, neglect or misconduct, provided reasonable care was
                exercised in the selection and continued employment thereof.

4.4     CHANGE OF RIGHTS AGENT

        The Rights Agent may resign and be discharged from its duties under this
Agreement upon 30 days' notice (or such lesser notice as is acceptable to the
Corporation) in writing mailed to the Corporation and to the transfer agent of
Common Shares by registered or certified mail, and to the holders of the Rights
in accordance with Section 5.8. The Corporation may remove the Rights Agent upon
30 days' notice in writing, mailed to the Rights Agent and to the transfer agent
of the Common Shares by registered or certified mail, and to the holders of the
Rights in accordance with Section 5.8. If the Rights Agent should resign or be
removed or otherwise become incapable of acting, the Corporation will appoint a
successor to the Rights Agent. If the Corporation fails to make such appointment
within a period of 30 days after such removal or after it has been notified in
writing of such resignation or incapacity by the resigning or incapacitated
Rights Agent or by the holder of any Rights (which holder shall, with such
notice, submit such holder's Rights Certificate for inspection by the
Corporation), then the resigning Rights Agent or the holder of any Rights may
apply to any court of competent jurisdiction for the appointment of a new Rights
Agent at the Corporation's expense. Any successor Rights Agent, whether
appointed by the Corporation or by such a court, shall be a corporation
incorporated under the laws of Canada or a province thereof. After appointment,
the successor Rights Agent will be vested with the same powers, rights, duties
and responsibilities as if it had been originally named as Rights Agent without
further act or deed; but the predecessor Rights Agent shall deliver and transfer
to the successor Rights Agent upon receipt of all outstanding fees and expenses
owing by the Corporation to the predecessor Rights Agent under this Agreement,
any property at the time held by it hereunder, and execute and deliver any
further


                                      -38-


<PAGE>   39
assurance, conveyance, act or deed necessary for the purpose. Not later than the
effective date of any such appointment, the Corporation will file notice thereof
in writing with the predecessor Rights Agent and each transfer agent of the
Common Shares, and mail a notice thereof in writing to the holders of the
Rights. Failure to give any notice provided for in this Section 4.4, however, or
any defect therein, shall not affect the legality or validity of the resignation
or removal of the Rights Agent or the appointment of the successor Rights Agent,
as the case may be.


                           ARTICLE 5 -- MISCELLANEOUS

5.1     REDEMPTION AND WAIVER

        (a)     The Board of Directors may, at its option, at any time prior to
                the occurrence of a Flip-in Event, elect to redeem all but not
                less than all of the then outstanding Rights at a redemption
                price of $0.0001 per Right appropriately adjusted in a manner
                analogous to the applicable adjustment provided for in Section
                2.3 in the event that an event of the type analogous to any of
                the events described in Section 2.3 shall have occurred (such
                redemption price being herein referred to as the "REDEMPTION
                PRICE"). The redemption of the Rights by the Board of Directors
                may be made effective at such time, on such basis and with such
                conditions as the Board of Directors in its sole discretion may
                establish.

        (b)     If an Offeror successfully completes a Permitted Bid by having
                taken up and paid for not less than 50 per cent of the Voting
                Shares held by Independent Shareholders pursuant to Permitted
                Bid Acquisitions, the Board of Directors shall, without further
                formality, be deemed to have elected to redeem the Rights at the
                Redemption Price on the Expiry Date of the Permitted Bid.

        (c)     If the Board of Directors elects to or is deemed to have elected
                to redeem the Rights, the right to exercise the Rights will
                thereupon without further action and without notice terminate
                and the only right thereafter of the holder of a Right shall be
                to receive the Redemption Price. Within 10 days of the Board of
                Directors electing or being deemed to have elected to redeem the
                Rights, the Corporation shall give notice of such redemption to
                the holders of the then outstanding Rights. Each such notice of
                redemption shall state the method by which the payment of the
                Redemption Price shall be made.

        (d)     The Board of Directors may until the occurrence of a Flip-in
                Event determine, upon prior written notice delivered to the
                Rights Agent, to waive the application of Section 3.1 to any
                particular Flip-in Event (which for greater certainty shall not
                include the circumstances described in Subsection 5.1(e));
                provided that if the Board of Directors waives the application
                of Section 3.1 to a particular Flip-in Event pursuant to this
                Subsection 5.1(d), subject to as provided below the Board of
                Directors shall be


                                      -39-


<PAGE>   40
                deemed to have waived the application of Section 3.1 to any
                other Flip-in Event occurring by reason of any Take-over Bid
                which is made by means of a take-over bid circular (i) prior to
                the granting of such waiver, (ii) thereafter and prior to the
                expiry of any Take-over Bid (as the same may be extended from
                time to time) outstanding at the time of the granting of such
                waiver or (iii) thereafter and prior to the expiry of any
                Take-over Bid in respect of which a waiver is, or is deemed to
                have been, granted under this Subsection 5.1(d); provided
                further that if the first waiver pursuant to this Subsection
                5.1(d) is in respect of any bid which would have been a
                Permitted Bid but for the absence of one or more of the elements
                of a Permitted Bid set out in subclauses 1.1(bb) (i), (ii),
                (iii) or (iv) (the "Waived Conditions"), any such second or
                further waiver which is deemed to occur by reason of Subsection
                5.1(d) shall only be deemed to occur if each such second or
                further Take-over Bid would also be a Permitted Bid but for the
                Waived Conditions.

        (e)     The Board of Directors may prior to the Close of Business on the
                tenth day following the Stock Acquisition Date determine, upon
                prior written notice delivered to the Rights Agent, to waive or
                to agree to waive the application of Section 3.1 to the Flip-in
                Event giving rise to the Stock Acquisition Date, provided that
                the Acquiring Person has (i) reduced its Beneficial Ownership of
                Voting Shares or (ii) has entered into a contractual arrangement
                with the Corporation, acceptable to the Board of Directors, to
                do so within 30 days of the date on which such contractual
                arrangement is entered into (the expiry of which period is
                herein referred to as the "DISPOSITION DATE"), such that at the
                time the waiver becomes effective pursuant to this Subsection
                5.1(e) such Person is no longer an Acquiring Person. In the
                event of such a waiver becoming effective, for the purposes of
                this Agreement, such Flip-in Event shall be deemed not to have
                occurred. Without limiting the generality of the foregoing, if
                the Person remains an Acquiring Person at the close of business
                on the Disposition Date, the Disposition Date shall be deemed to
                be the date of occurrence of a further Stock Acquisition Date
                and Section 3.1 shall apply thereto.

        (f)     Where a Take-over Bid, or other events giving rise to a
                Separation Time, is withdrawn or otherwise terminated after the
                Separation Time has occurred and prior to the occurrence of a
                Flip-in Event, or in any other circumstances prior to the
                occurrence of a Flip-in Event, the Board of Directors may elect
                to redeem all the outstanding Rights at the Redemption Price.
                Without restricting the rights of the Board of Directors to
                elect to redeem the Rights pursuant to section 5.1(a) rather
                than pursuant to section 5.1(f), upon the Rights being redeemed
                pursuant to this section 5.1(f), all of the provisions of this
                Agreement shall continue to apply as if the Separation Time had
                not occurred and Rights Certificates representing the number of
                Rights held by each holder of record of Common Shares as of the
                Separation Time had not been mailed to each such holder and for
                all purposes of this Agreement the events giving rise to the
                Separation Time shall be deemed not to have occurred.


                                      -40-


<PAGE>   41
        (g)     The Corporation shall give prompt written notice to the Rights
                Agent of any waiver of the application of Section 3.1 made by
                the Board of Directors under this Section 5.1.

5.2     EXPIRATION

        No Person shall have any rights pursuant to this Agreement or in respect
of any Right after the Expiration Time, except the Rights Agent as specified in
Subsection 4.1(a) hereof.

5.3     ISSUANCE OF NEW RIGHTS CERTIFICATES

        Notwithstanding any of the provisions of this Agreement or of the Rights
to the contrary, the Corporation may, at its option, issue new Rights
Certificates evidencing Rights in such form as may be approved by the Board of
Directors to reflect any adjustment or change in the number or kind or class of
shares purchasable upon exercise of Rights made in accordance with the
provisions of this Agreement.

5.4     SUPPLEMENTS AND AMENDMENTS

        (a)     Without the approval of any holders of Voting Shares or Rights,
                the Corporation may make amendments to this Agreement to correct
                any clerical or typographical error or which are required to
                maintain the validity of the Agreement as a result of any change
                in any applicable legislation or regulations thereunder or which
                are made to cure any ambiguity, defect or inconsistency, or
                which are to make changes which do not adversely affect the
                interests of holders of Rights (excluding the interests of any
                Acquiring Person or other persons identified in section 3.1(b)
                hereof), or which are to shorten or lengthen any time period
                under the Rights Agreement; provided, however, that no amendment
                to adjust the time period governing redemption shall be made.
                The Corporation may, prior to the date of the shareholders'
                meeting referred to in Section 5.4(f), supplement or amend this
                Agreement without the approval of any holders of Rights or
                Voting Shares in order to make any changes which the Board of
                Directors acting in good faith may deem necessary or desirable.
                Notwithstanding anything in this Section 5.4 to the contrary, no
                supplement or amendment shall be made to the provisions of
                Article 4 except with the written concurrence of the Rights
                Agent to such change, supplement or amendment.

        (b)     Subject to subsection 5.4(a), the Corporation may, with the
                prior consent of the holders of Voting Shares obtained as set
                forth below, at any time before the Separation Time, amend, vary
                or rescind any of the provisions of this Agreement and the
                Rights (whether or not such action would materially adversely
                affect the interests of the holders of Rights generally). Such
                consent shall be deemed to have been given if the action
                requiring such approval is approved by the affirmative vote of a
                majority of the votes cast by Independent Shareholders
                represented in person or by proxy at the Special Meeting.

        (c)     The Corporation may, with the prior consent of the holders of
                Rights obtained as set forth below, at any time after the Stock
                Acquisition Date amend, vary or rescind any of the provisions of
                this Agreement and the Rights (whether or not such action would


                                      -41-


<PAGE>   42
                materially adversely affect the interests of the holders of
                Rights generally), provided that no such amendment, variation or
                deletion shall be made to the provisions of Article 4 except
                with the written concurrence of the Rights Agent thereto. Such
                consent shall be deemed to have been given if such amendment,
                variation or deletion is authorized by the affirmative votes of
                the holders of Rights present or represented at and entitled to
                vote at a meeting of the holders and representing 50% plus one
                of the votes cast in respect thereof.

        (d)     Any approval of the holders of Rights shall be deemed to have
                been given if the action requiring such approval is authorized
                by the affirmative votes of the holders of Rights present or
                represented and entitled to vote at a meeting of the holders of
                Rights and representing a majority of the votes cast in respect
                thereof. For purposes hereof, each outstanding Right (other than
                Rights which are void pursuant to the provisions hereof) shall
                be entitled to one vote, and the procedures for the calling,
                holding and conduct of the meeting shall be those, as nearly as
                may be, which are provided in the Corporation's by-laws and the
                Corporations Act with respect to meetings of shareholders of the
                Corporation.

        (e)     Any amendments made by the Corporation to this Agreement
                pursuant to Subsection 5.4(a) which are required to maintain the
                validity of this Agreement as a result of any change in any
                applicable legislation or regulation thereunder shall:

                (i)     if made before the Separation Time, be submitted to the
                        shareholders of the Corporation at the next meeting of
                        shareholders and the shareholders may, by the majority
                        referred to in subsection 5.4(b) confirm or reject such
                        amendment;

                (ii)    if made after the Separation Time, be submitted to the
                        holders of Rights at a meeting to be called for on a
                        date not later than immediately following the next
                        meeting of shareholders of the Corporation and the
                        holders of Rights may, by resolution passed by the
                        majority referred to in Subsection 5.4(d) confirm or
                        reject such amendment.

                        Any such amendment shall be effective from the date of
                        the resolution of the Board of Directors adopting such
                        amendment, until it is confirmed or rejected or until it
                        ceases to be effective (as described in the next
                        sentence) and, where such amendment is confirmed, it
                        continues in effect in the form so confirmed. If such
                        amendment is rejected by the shareholders or the holders
                        of Rights or is not submitted to the shareholders or
                        holders of Rights as required, then such amendment shall
                        cease to be effective from and after the termination of
                        the meeting at which it was rejected or to which it
                        should have been but was not submitted or from and after
                        the date of the meeting of holders of Rights that should
                        have been but was not held, and no subsequent resolution
                        of the


                                      -42-


<PAGE>   43
                        Board of Directors to amend this Agreement to
                        substantially the same effect shall be effective until
                        confirmed by the shareholders or holders of Rights as
                        the case may be.

        (f)     The Board of Directors shall call and hold a Special Meeting of
                holders of Voting Shares to consider and, if thought
                appropriate, ratify the distribution and the continued existence
                of the Rights. The Special Meeting shall be held on a date fixed
                by the Board of Directors, which date shall be no later than May
                26, 1999 (or such later date as The Toronto Stock Exchange may
                approve. The Board of Directors shall fix a record date for
                determining the holders of Voting Shares entitled to receive
                notice of the Special Meeting in accordance with all applicable
                laws and the articles and by-laws of the Corporation. Unless a
                majority of the votes cast by the Independent Shareholders on
                such resolution are voted in favour of the continued existence
                of the Rights, then the Board of Directors shall immediately
                upon the confirmation by the Chairman of such shareholders'
                meeting of the result of the vote on such resolution, without
                further formality, be deemed to have elected to redeem the
                Rights at the Redemption Price.

        (g)     The Corporation shall be required to provide the Rights Agent
                with notice in writing of any such amendment, recession or
                variation to this Agreement as referred to in this Section 5.4
                within five days of effecting such amendment, recession or
                variation.

        (h)     Any supplement or amendment to this Agreement pursuant to
                Section 5.4(b) through (g) shall be subject to the receipt of
                any requisite approval or consent from any governmental or
                regulatory authority having jurisdiction over the Corporation,
                including without limitation an requisite approval of stock
                exchanges on which the Shares are listed (which supplement or
                amendment shall be effective upon receipt of such approval
                (whether or not such approval is subject to one or more
                conditions which must be satisfied)).

5.5     FRACTIONAL RIGHTS AND FRACTIONAL SHARES

        (a)     The Corporation shall not be required to issue fractions of
                Rights or to distribute Rights Certificates which evidence
                fractional Rights. After the Separation Time, there shall be
                paid to the registered holders of the Rights Certificates with
                regard to which fractional Rights would otherwise be issuable,
                an amount in cash equal to the same fraction of the Market Price
                of a whole Right in lieu of such fractional Rights. The Rights
                Agent shall have no obligation to make any payments in lieu of
                fractional Rights unless the Corporation shall have provided the
                Rights Agent with the necessary funds to pay in full all amounts
                payable in accordance with Section 2.2 (e).


                                      -43-


<PAGE>   44
        (b)     The Corporation shall not be required to issue fractional Common
                Shares upon exercise of the Rights or to distribute certificates
                which evidence fractional Common Shares. In lieu of issuing
                fractional Common Shares, the Corporation shall pay to the
                registered holder of Rights Certificates at the time such Rights
                are exercised as herein provided, an amount in cash equal to the
                same fraction of the Market Price of one Common Share. The
                Rights Agent shall have no obligation to make any payments in
                lieu of fractional Common Shares unless the Corporation shall
                have provided the Rights Agent with the necessary funds to pay
                in full all amounts payable in accordance with Section 2.2 (e).

5.6     RIGHTS OF ACTION

        Subject to the terms of this Agreement, rights of action in respect of
this Agreement, other than rights of action vested solely in the Rights Agent,
are vested in the respective holders of the Rights; and any holder of any
Rights, without the consent of the Rights Agent or of the holder of any other
Rights may, on such holder's own behalf and for such holder's own benefit and
the benefit of other holders of Rights, enforce, and may institute and maintain
any suit, action or proceeding against the Corporation to enforce, or otherwise
act in respect of, such holder's right to exercise such holder's Rights to which
such Person is entitled, in the manner provided in such holders Rights
Certificate and in this Agreement. Without limiting the foregoing or any
remedies available to the holders of Rights, it is specifically acknowledged
that the holders of Rights would not have an adequate remedy at law for any
breach of this Agreement and will be entitled to specific performance of the
obligations under, and injunctive relief against actual or threatened violations
of, the obligations of any Person subject to this Agreement.

5.7     HOLDER OF RIGHTS DEEMED NOT A SHAREHOLDER

        No holder, as such, of any Rights shall be entitled to vote, receive
dividends or be deemed for any purpose the holder of Common Shares or any other
securities which may at any time be issuable on the exercise of such Rights, nor
shall anything contained herein or in any Rights Certificate be construed to
confer upon the holder of any Rights as such, any of the rights of a shareholder
of the Corporation or any right to vote for the election of directors or upon
any matter submitted to shareholders at any meeting thereof, or to give or
withhold consent to any corporate action, or to receive notice of meetings or
other actions affecting shareholders, or to receive dividends or subscription
rights or otherwise.

5.8     NOTICES

        Notices or demands authorized or required by this Agreement to be given
or made by the Rights Agent or by the holder of any Rights to or on the
Corporation shall be sufficiently given or made if delivered personally or if
delivered or sent by registered or certified mail, postage prepaid, or by
facsimile transmission addressed (until another address is filed in writing with
the Rights Agent) as follows:


                                      -44-


<PAGE>   45
SALIX PHARMACEUTICALS, LTD.
3600 W. Bayshore Road
Suite 205
Palo Alto, CA  94303
U.S.A.

Facsimile No.:                (650) 856-1555
Attention:           President and Chief Executive Officer

Any such notice or demand shall be deemed to have been received, if delivered
personally, on the date of delivery (if such date is a Business Day, failing
which it shall be deemed delivered on the next Business Day), if sent by
facsimile, on the next Business Day following transmission or if sent by
registered or certified mail, on the fifth Business Day after the mailing
thereof, except in the case of interruption of regular mail service, in which
case such notice shall be sent by facsimile or personally delivered.

        Any notice or demand authorized or required by this Agreement to be
given or made by the Corporation or by the holder of any Rights to or on the
Rights Agent shall be sufficiently given or made if delivered personally or if
delivered or sent by registered or certified mail, postage prepaid, or by
facsimile transmission addressed as follows:

MONTREAL TRUST COMPANY OF CANADA
151 Front Street West
8th Floor
Toronto, Ontario
M5J 2N1

Attention:          Senior Manager, Client Services
Facsimile No.:              (416) 981-9800

Any such notice or demand shall be deemed to have been received, if delivered
personally, on the date of delivery (if such date is a Business Day, failing
which it shall be deemed delivered on the next Business Day), if sent by
facsimile, on the next Business Day following transmission or if sent by
registered or certified mail, on the fifth Business Day after the mailing
thereof, except in the case of interruption of regular mail service, in which
case such notice shall be sent by facsimile or personally delivered.

        Notices or demands authorized or required by this Agreement to be given
or made by the Corporation or the Rights Agent to or on the holder of any Rights
shall be sufficiently given or made if delivered or sent by first-class mail,
postage prepaid, addressed to such holder at the address of such holder as it
appears on the Rights Register or, prior to the Separation Time, on the
registers of the Corporation for the Common Shares. Any notice which is mailed
in the manner herein provided shall be deemed given on the fifth Business Day
after the date of mailing thereof, whether or not the 


                                      -45-


<PAGE>   46
holder receives the notice. In the event of any interruption of mail service,
such notice required or permitted to be given hereunder will be deemed to be
sufficiently given by advertisement of such notice in a newspaper of general
circulation in the City of Toronto.

5.9     COSTS OF ENFORCEMENT

        The Corporation agrees that if the Corporation or any other Person the
securities of which are purchasable upon exercise of Rights fails to fulfil any
of its obligations pursuant to this Agreement, then the Corporation or such
Person will reimburse the holder of any Rights for the costs and expenses
(including legal fees) incurred by such holder in actions to enforce his rights
pursuant to any Rights or this Agreement.

5.10    REGULATORY APPROVALS

        Any obligation of the Corporation or action or event contemplated by
this Agreement, or any amendment to this Agreement, shall be subject to the
receipt of any requisite approval or consent from any governmental or regulatory
authority.

5.11    DECLARATION AS TO NON-CANADIAN AND NON-U.S. HOLDERS

        If in the opinion of the Board of Directors (who may rely upon the
advice of counsel) any action or event contemplated by this Agreement would
require compliance with the securities laws or comparable legislation of a
jurisdiction outside Canada and the United States of America, the Board of
Directors acting in good faith may take such actions as it may deem appropriate
to ensure that such compliance is not required, including without limitation
establishing procedures for the issuance to a Canadian resident fiduciary of
Rights, or securities issuable on exercise of Rights, the holding thereof in
trust for the Persons entitled thereto (but reserving to the fiduciary or to the
fiduciary and the Corporation, as the Corporation may determine, absolute
discretion with respect thereto) and the sale thereof and remittance of the
proceeds of such sale, if any, to the Persons entitled thereto. In no event
shall the Corporation or the Rights Agent be required to issue or deliver Rights
or securities issuable on exercise of Rights to Persons who are citizens,
residents or nationals of any jurisdiction other than Canada and any province or
territory thereof and the United States of America in which such issue or
delivery would be unlawful without registration of the relevant Persons or
securities for such purposes.

5.12    SUCCESSORS

        All the covenants and provisions of this Agreement by or for the benefit
of the Corporation or the Rights Agent shall bind and inure to the benefit of
their respective successors and assigns hereunder.

5.13    BENEFITS OF THIS AGREEMENT


                                      -46-


<PAGE>   47
        Nothing in this Agreement shall be construed to give to any Person other
than the Corporation, the Rights Agent and the holders of the Rights any legal
or equitable right, remedy or claim under this Agreement; but this Agreement
shall be for the sole and exclusive benefit of the Corporation, the Rights Agent
and the holders of the Rights.

5.14    GOVERNING LAW

        This Agreement and each Right issued hereunder shall be deemed to be a
contract made under the laws of the Province of Ontario and for all purposes
shall be governed by and construed in accordance with the laws of such
jurisdiction applicable to contracts to be made and performed entirely within
such province.

5.15    LANGUAGE

        Les parties aux presentes ont exige que la presente convention ainsi que
tous les documents et avis qui s'y rattachent et/ou qui en decoulent soient
rediges en langue anglaise. The parties hereto have required that this Agreement
and all documents and notices related thereto and/or resulting therefrom be
drawn up in English.

5.16    COUNTERPARTS

        This Agreement may be executed in any number of counterparts and each of
such counterparts shall for all purposes be deemed to be an original, and all
such counterparts shall together constitute but one and the same instrument.

5.17    SEVERABILITY

        If any Section, Subsection, paragraph, subparagraph, term or provision
hereof or the application thereof to any circumstance shall, in any jurisdiction
and to any extent, be invalid or unenforceable, such Section, Subsection,
paragraph, subparagraph, term or provision shall be ineffective as to such
jurisdiction to the extent of such invalidity or unenforceability without
invalidating or rendering unenforceable the remaining Sections, Subsections,
paragraphs, subparagraphs, terms and provisions hereof or the application of
such Section, Subsection, paragraph, subparagraph, term or provision to
circumstances other than those as to which it is held invalid or unenforceable.

5.18    EFFECTIVE DATE

        This Agreement is effective from the date hereof.

5.19    TIME OF THE ESSENCE

        Time shall be of the essence hereof.


                                      -47-


<PAGE>   48
5.20    DETERMINATIONS AND ACTIONS BY THE BOARD OF DIRECTORS

        The Board of Directors shall have the exclusive power and authority to
administer and amend this Agreement in accordance with the terms hereof and to
exercise all rights and powers specifically granted hereunder to the Board of
Directors or the Corporation, or as may be necessary or advisable in the
administration of this Agreement, including, without limitation, the right and
power to (i) interpret the provisions of this Agreement and (ii) make all
determinations deemed necessary or advisable for the administration of this
Agreement (including a determination to redeem or not to redeem the Rights or to
amend the Agreement, in accordance with the terms hereof). All such actions,
calculations and determinations (including, for purposes of clause (y) below,
all omissions with respect to the foregoing) which are done or made by the Board
of Directors in good faith, shall (x) be final, conclusive and binding on the
Corporation, the Rights Agent, the holders of the Rights, and all other parties
and (y) not subject the Board of Directors to any liability to the holders of
the Rights, or any other parties.

        IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed as of the date first above written.



                         SALIX PHARMACEUTICALS, LTD.


                         Per: /s/ DAVID BOYLE
                              -------------------------------
                              David Boyle
                              Chief Financial Officer
                              Authorized Signing Officer


                         MONTREAL TRUST COMPANY OF CANADA


                         Per: /s/ DAN DISHY
                              -------------------------------

                         Per: /s/ WILLIAM HOLMES
                              -------------------------------


<PAGE>   49
                                    EXHIBIT A

                          [FORM OF RIGHTS CERTIFICATE]

Certificate No._____________________                          ___________ Rights

      UNTIL THE SEPARATION TIME (AS DEFINED IN THE RIGHTS AGREEMENT REFERRED TO
      BELOW), THIS CERTIFICATE ALSO EVIDENCES AND ENTITLES THE HOLDER HEREOF TO
      CERTAIN RIGHTS AS SET FORTH IN A SHAREHOLDER PROTECTION RIGHTS AGREEMENT
      MADE AS OF NOVEMBER 4, 1998 (THE "RIGHTS AGREEMENT"), BETWEEN SALIX
      PHARMACEUTICALS, LTD. (THE "CORPORATION") AND MONTREAL TRUST COMPANY OF
      CANADA , AS RIGHTS AGENT, THE TERMS OF WHICH ARE INCORPORATED HEREIN BY
      THIS REFERENCE AND A COPY OF WHICH IS ON FILE AT THE PRINCIPAL OFFICE OF
      THE CORPORATION. UNDER CERTAIN CIRCUMSTANCES, AS SET FORTH IN THE RIGHTS
      AGREEMENT, SUCH RIGHTS MAY BE AMENDED OR REDEEMED, MAY EXPIRE, MAY BECOME
      VOID (IF, IN CERTAIN CASES, THEY ARE "BENEFICIALLY OWNED" BY AN "ACQUIRING
      PERSON" OR AN "INELIGIBLE SHAREHOLDER", AS SUCH TERMS ARE DEFINED IN THE
      RIGHTS AGREEMENT, OR A TRANSFEREE THEREOF), OR MAY BE EVIDENCED BY
      SEPARATE CERTIFICATES AND MAY NO LONGER BE EVIDENCED BY THIS CERTIFICATE.
      THE CORPORATION WILL MAIL, OR ARRANGE FOR THE MAILING OF, A COPY OF THE
      RIGHTS AGREEMENT TO THE HOLDER OF THIS CERTIFICATE WITHOUT CHARGE PROMPTLY
      AFTER THE RECEIPT OF A WRITTEN REQUEST THEREFOR.

                               RIGHTS CERTIFICATE

This certifies that _________________ is the registered holder of the number of 
Rights set forth above, each of which entitles the registered holder thereof,
subject to the terms, provisions and conditions of the Shareholder Protection
Rights Agreement made as of November 4, 1998 (the "Rights Agreement") as amended
between SALIX PHARMACEUTICALS, LTD., a corporation incorporated under the laws
of British Virgin Islands (the "Corporation") and Montreal Trust Company of
Canada, a trust company incorporated under the laws of Canada, as Rights Agent
(the "Rights Agent", which term shall include any successor Rights Agent under
the Rights Agreement), to purchase from the Corporation, at any time after the
Separation Time and prior to the Expiration Time (as such terms are defined in
the Rights Agreement), one fully paid common share of the Corporation (a "Common
Share") at the Exercise Price referred to below, upon presentation and surrender
of this Rights Certificate, together with the Form of Election to Exercise
appropriately completed and duly executed, to the Rights Agent at its principal
office in the City of Toronto (or such other locations as the Corporation and
the Rights Agent may from time to time determine). Until adjustment thereof in
certain events as provided in the Rights Agreement, the


                                     A - 2


<PAGE>   50
Exercise Price shall be $60 per Right (payable by bank draft, certified cheque
or money order payable to the order of the Corporation).

        In certain circumstances described in the Rights Agreement, each Right
evidenced hereby may entitle the registered holder thereof to purchase or
receive assets, debt securities or shares in the capital of the Corporation
other than Common Shares, or more or less than one Common Share (or a
combination thereof), all as provided in the Rights Agreement.

        This Rights Certificate is subject to all of the terms, provisions and
conditions of the Rights Agreement, which terms, provisions and conditions are
hereby incorporated herein by reference and made a part hereof and to which
Rights Agreement reference is hereby made for a full description of the rights,
limitations of rights, obligations, duties and immunities thereunder of the
Rights Agent, the Corporation and the holders of the Rights Certificates. Copies
of the Rights Agreement are on file at the principal office of the Corporation
and are available upon written request.

        This Rights Certificate, with or without other Rights Certificates, upon
surrender at the principal office of the Rights Agent in the City of Toronto (or
such other locations as the Corporation and the Rights Agent may from time to
time determine), may be exchanged for another Rights Certificate or Rights
Certificates of like tenor evidencing an aggregate number of Rights equal to the
aggregate number of Rights evidenced by the Rights Certificate or Rights
Certificates surrendered. If this Rights Certificate shall be exercised in part,
the registered holder shall be entitled to receive, upon surrender hereof,
another Rights Certificate or Rights Certificates for the number of whole Rights
not exercised.

        Subject to the provisions of the Rights Agreement, the Rights evidenced
by this Certificate (i) may be redeemed by the Corporation at a redemption price
of $0.0001 per Right, subject to adjustment in certain events, or (ii) may be
exchanged, at the option of the Corporation, for cash, debt or equity securities
or other assets (or a combination thereof).

        No fractional Common Shares will be issued upon the exercise of any
Right or Rights evidenced hereby, but in lieu thereof a cash payment will be
made, as provided in the Rights Agreement.

        No holder of this Rights Certificate, as such, shall be entitled to vote
or receive dividends or be deemed for any purpose the holder of Common Shares or
any other securities which may at any time be issuable upon the exercise hereof,
nor shall anything contained in the Rights Agreement or herein be construed to
confer upon the holder hereof, as such, any of the rights of a shareholder of
the Corporation or any right to vote for the election of directors or upon any
matter submitted to shareholders at any meeting thereof, or to give or withhold
consent to any corporate action, or to receive notice of any meeting or other
actions affecting shareholders (except as provided in the Rights Agreement), or
to receive dividends or subscription rights or otherwise, until the Rights
evidenced by this Rights Certificate shall have been exercised as provided in
the Rights Agreement.


                                     A - 3


<PAGE>   51
        This Rights Certificate shall not be valid or obligatory for any purpose
until it shall have been countersigned by the Rights Agent.

WITNESS the signature of the proper officers of the Corporation.

Date:
     -------------------------------

SALIX PHARMACEUTICALS, LTD.

Per:
    -------------------------------
      Chief Executive Officer

Per:
    -------------------------------
      Chief Financial Officer



Countersigned:

MONTREAL TRUST COMPANY OF CANADA

Per:
    -------------------------------
      Authorized Signature


                                     A - 4


<PAGE>   52
                           [Continued on Reverse Side]

                          FORM OF ELECTION TO EXERCISE


TO:   SALIX PHARMACEUTICALS, LTD.


The undersigned hereby irrevocably elects to exercise _____________whole Rights
represented by this Rights Certificate to purchase the Common Shares issuable
upon the exercise of such Rights and requests that certificates for such Common
Shares be issued in the name of and delivered to:


      --------------------------------------
      Name


      --------------------------------------
      Address


      --------------------------------------
      City and Province/State/Country


      --------------------------------------
      Social Insurance No. or other taxpayer
      identification number


      If such number of Rights shall not be all the Rights evidenced by this
Rights Certificate, a new Rights Certificate for the balance of such Rights
shall be registered in the name of and delivered to:



      --------------------------------------
      Name


      --------------------------------------
      Address


      --------------------------------------
      City and Province/State/Country


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


                                     A - 5


<PAGE>   53
      Social Insurance Number or other
      taxpayer identification number


Date:
      ----------------------------------


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

                                          Signature

                                          (Signature must correspond to name as
                                          written upon the face of this Rights
                                          Certificate in every particular,
                                          without alteration or enlargement or
                                          any change whatsoever)
- --------------------------------------
Signature Guaranteed


                 (THE FOLLOWING IS TO BE COMPLETED ONLY IF TRUE)

        The undersigned hereby represents, for the benefit of the Corporation
and all holders of Rights and Common Shares, that the Rights evidenced by this
Rights Certificate are not and, to the knowledge of the undersigned, have never
been, Beneficially Owned by (i) an Acquiring Person, (ii) any Affiliate or
Associate of an Acquiring Person, (iii) any other Person acting jointly or in
concert with an Acquiring Person or any Affiliate of an Acquiring Person, or
(iv) any other Person whose securities are deemed to be Beneficially Owned by an
Acquiring Person. Capitalized terms shall have the meanings ascribed thereto in
the Rights Agreement.

Date:
      ----------------------------------


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

                                          Signature

                                          (Signature must correspond to name as
                                          written upon the face of this Rights
                                          Certificate in every particular,
                                          without alteration or enlargement or
                                          any change whatsoever)
- --------------------------------------
Signature Guaranteed


                                     A - 6


<PAGE>   54
NOTE: Signature must be guaranteed by a major Canadian trust company, Canadian
chartered bank, or a member of the Securities Transfer Agents Medallion Program
(STAMP).


                                     A - 7


<PAGE>   55
                              FORM OF ASSIGNMENT

FOR VALUE RECEIVED, the undersigned hereby sells, assigns and transfers unto


- --------------------------------------------------------------------------------
(Please print name and address of transferee)

_________ {insert number} of the Rights represented by this Rights Certificate,
together with all right, title and interest therein.


Date:
      ----------------------------------


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

                                          Signature

                                          (Signature must correspond to name as
                                          written upon the face of this Rights
                                          Certificate in every particular,
                                          without alteration or enlargement or
                                          any change whatsoever)
- --------------------------------------
Signature Guaranteed


                 (THE FOLLOWING IS TO BE COMPLETED ONLY IF TRUE)

        The undersigned hereby represents, for the benefit of the Corporation
and all holders of Rights and Common Shares, that the Rights evidenced by this
Rights Certificate are not and, to the knowledge of the undersigned, have never
been, Beneficially Owned by (i) an Acquiring Person, (ii) any Affiliate or
Associate of an Acquiring Person, (iii) any other Person acting jointly or in
concert with an Acquiring Person or any Affiliate of an Acquiring Person, or
(iv) any other Person whose securities are deemed to be Beneficially Owned by an
Acquiring Person. Capitalized terms shall have the meanings ascribed thereto in
the Rights Agreement.


Date:
      ----------------------------------


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

                                          Signature

                                          (Signature must correspond to name as
                                          written upon the face of this Rights
                                          Certificate in every particular,
                                          without 


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<PAGE>   56
                                          alteration or enlargement or any 
                                          change whatsoever)
- --------------------------------------
Signature Guaranteed

NOTE: Signature must be guaranteed by a major Canadian trust company, Canadian
chartered bank, or a member of the Securities Transfer Agents Medallion Program
(STAMP).


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<PAGE>   57
                                     NOTICE

      In the event that the certifications set forth above in the Forms of
      Election to Exercise and Assignment are not completed, the Corporation
      shall deem the Beneficial Owner of the Rights represented by this Rights
      Certificate to be an Acquiring Person or other Ineligible Shareholder and,
      accordingly, such Rights shall be null and void. Capitalized terms shall
      have the meanings ascribed thereto in the Rights Agreement.


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