CONNETICS CORP
8-A12G, 1997-05-23
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



                              CONNETICS CORPORATION
             (Exact Name of Registrant as Specified in Its Charter)

                    (FORMERLY CONNECTIVE THERAPEUTICS, INC.)




                 Delaware                                   94-3173928
- ----------------------------------------                -------------------
(State of Incorporation or Organization)                   (IRS Employer
                                                        Identification No.)


 3400 West Bayshore Road, Palo Alto, CA                         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

        Securities to be registered pursuant to Section 12(g) of the Act:

                         Preferred Share Purchase Rights
                         -------------------------------
                                (Title of Class)



<PAGE>   2



ITEM 1.  DESCRIPTION OF REGISTRANT'S SECURITIES TO BE REGISTERED.

         Effective as of April 29, 1997, the Board of Directors of Connetics
Corporation, formerly Connective Therapeutics, Inc. (the "Company") declared a
dividend of one preferred share purchase right (a "Right") for each outstanding
share of Common Stock, $0.001 par value (the "Common Shares"), of the Company.
The dividend is payable on May 20, 1997 (the "Record Date") to stockholders of
record as of the close of business on that date. Each Right entitles the
registered holder to purchase from the Company one one-thousandth of a share of
Series B Participating Preferred Stock, $0.001 par value, of the Company (the
"Preferred Shares"), subject to adjustment, at a price of $49 per one-thousandth
of a preferred share, subject to adjustment (the "Purchase Price"). The
description and terms of the Rights are set forth in a Preferred Shares Rights
Agreement (the "Rights Agreement") dated as of May 20, 1997 between the Company
and U.S. Stock Transfer Corporation, 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 Certificate of Designation, 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 Distribution Date (defined
below). 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 Distribution Date (or earlier redemption, exchange or
expiration of the Rights), the surrender or transfer of any certificates for
Common Shares, 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.



                                      -2-
<PAGE>   3

Distribution Date

         The Rights will separate from the Common Shares, certificates for the
rights ("Rights Certificates") will be issued and the Rights will become
exercisable upon the earlier of: (i) the close of business on the tenth day (or
such later date as may be determined by a majority of the Board of Directors,
excluding directors affiliated with the Acquiring Person, as defined below (the
"Continuing Directors")) following a public announcement that a person or group
of affiliated or associated persons has acquired, or obtained the right to
acquire, beneficial ownership of 15% or more of the outstanding Common Shares
(an "Acquiring Person") or (ii) the close of business on the tenth day (or such
later date as may be determined by a majority of the Continuing Directors)
following the commencement of a tender offer or exchange offer, the consummation
of which would result in the beneficial ownership by a person or group of 15% or
more of the outstanding Common Shares. The earlier of such dates is referred to
as the "Distribution Date". 

Issuance of Rights Certificates, Expiration of Rights

         As soon as practicable following the Distribution Date, separate Rights
Certificates will be mailed to holders of record of the Common Shares as of the
close of business on the Distribution Date and such separate Rights Certificates
alone will evidence the Rights from and after the Distribution Date. Unless
otherwise determined by the Board of Directors, all Common Shares issued prior
to the Distribution Date will be issued with Rights. Common Shares issued after
the Distribution Date may be issued with Rights if such shares are issued (i)
upon the exercise, conversion or exchange of securities issued after adoption of
the Rights Agreement or (ii) pursuant to the exercise of stock options or under
any employee benefit plan or arrangement. Except as otherwise determined by the
Board of Directors, no other Common Shares issued after the Distribution Date
will be issued with Rights. In addition, no Common Shares issued after the
Distribution Date will be issued with Rights if such issuance would result in
(or create a significant risk) (i) of material adverse tax consequences to the
Company or the person to whom such Rights Certificate would be issued or (ii)
that such options or plans would not qualify for 




                                      -3-
<PAGE>   4

otherwise available special tax treatment. The Rights will expire on April 29,
2007 (the "Final Expiration Date"), unless the Final Expiration Date is extended
or unless the Rights are earlier redeemed or exchanged by the Company or expire
upon consummation of certain mergers, consolidations or sales of assets, as
described below.

Initial Exercise of the Rights

         Following the Distribution Date, and until the occurrence of one of the
subsequent events described below, holders of the Rights will be entitled to
receive, upon exercise and the payment of $49 (the "Purchase Price") per Right,
one one-thousandth of a Preferred Share.

Exchange Provision

         At any time after an Acquiring Person has become such and prior to the
Acquiring Person beneficially owning 50% or more of the outstanding Common
Shares, the Board of Directors of the Company may exchange the Rights (other
than Rights owned by the Acquiring Person or its affiliates), in whole or in
part, at an exchange ratio of one Common Share per Right (subject to
adjustment). 

Right to Buy Common Shares at Half Price

         Unless the Rights are earlier redeemed or exchanged, in the event that
an Acquiring Person becomes such, other than pursuant to a tender offer which is
made for all of the outstanding Common Shares and approved by a majority of the
Continuing Directors after determining that the offer is both adequate and
otherwise in the best interests of the Company and its stockholders (a
"Permitted Offer"), then proper provision will be made so that each holder of a
Right which has not theretofore been exercised (other than Rights beneficially
owned by the Acquiring Person, which will thereafter be void) will thereafter
have the right to receive, upon exercise of a Right, a number of Common Shares
having a then current value equal to two times the Purchase Price. In the event
that the Company does not have a sufficient number of Common Shares available,
or the Board decides that such action is necessary or appropriate and not
contrary to the interests of Rights holders, the Company may, among other
things, instead substi-




                                      -4-
<PAGE>   5

tute cash, assets or other securities for the Common Shares into which the
Rights would have otherwise been exercisable. 

Right to Buy Acquiring Company Stock at Half Price

         Similarly, unless the Rights are earlier redeemed or exchanged, in the
event that, after the Shares Acquisition Date (as defined below), (i) the
Company consolidates with or merges into another entity, (ii) another entity
consolidates with or merges into the Company or (iii) the Company sells or
otherwise transfers 50% or more of its consolidated assets or earning power,
proper provision must be made so that each holder of a Right which has not
theretofore been exercised (other than Rights beneficially owned by the
Acquiring Person, which will thereafter be void) will thereafter have the right
to receive, upon exercise, a number of shares of common stock of the acquiring
company having a then current value equal to two times the Purchase Price
(unless the transaction satisfies certain conditions and is consummated with a
person who acquired shares pursuant to a Permitted Offer, in which case the
Rights will expire). 

Adjustments to Prevent Dilution

         The Purchase Price payable, the number of Rights and the number of
Preferred Shares, 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 Purchase Price will be required until cumulative adjustments
require an adjustment of at least 1% in such Purchase Price.

Rights and Preferences of the Preferred Shares

         Preferred Shares purchasable upon exercise of the Rights will not be
redeemable. Each Preferred Share will be entitled to an aggregate dividend of
1,000 times the dividend declared per Common Share. In the event of liquidation,
the holders of the Preferred Shares will be entitled to a preferential
liquidation payment equal to accrued but unpaid dividends plus the greater of
$1,000 per share or 1,000 times the aggregate per share amount to be distributed
to the holders of Common Shares. Each Preferred Share will have 1,000 votes,
voting together with the holders of 




                                      -5-
<PAGE>   6
Common Shares, except as required by law or the Certificate of Determination of
Rights, Preferences and Privileges of Series B Participating Preferred Stock. In
the event of any merger, consolidation or other transaction in which Common
Shares are changed or exchanged, each Preferred Share will be entitled to
receive 1,000 times the amount received per Common Share. These rights are
protected by customary anti-dilution provisions. Because of the nature of the
dividend, liquidation and voting rights of the Preferred Shares, the value of
the one one-thousandth interest in a Preferred Share purchasable upon exercise
of each Right should approximate the value of one Common Share.

Redemption

         At any time prior to the close of business on the earlier of (i) the
tenth day following the date (the "Shares Acquisition Date") of public
announcement that an Acquiring Person has become such or such later date as may
be determined by a majority of the Continuing Directors and publicly announced
by the Company or (ii) the Final Expiration Date of the Rights, the Company may
redeem the Rights in whole, but not in part, at a price of $0.01 per Right
("Redemption Price"). 

No Stockholders' Rights Prior to Exercise

         Until a Right is exercised, the holder thereof, as such, will have no
rights as a stockholder 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 be supplemented or amended
by the Board of Directors in any manner prior to the Distribution Date without
the approval of Rights holders. After the Distribution Date, the provisions of
the Rights Agreement may be supplemented or amended by the Board in order to (i)
cure any ambiguity, defect or inconsistency, (ii) to make changes which are
deemed necessary or advisable and do not adversely affect the interests of
holders of Rights (excluding the interests of any Acquiring Person), or (iii) to
shorten or lengthen any time period under the Rights Agreement; provided,
however, that no amendment to lengthen 




                                      -6-
<PAGE>   7

(A) the time period governing redemption shall be made at such time as the
Rights are not redeemable, or (B) any other period unless for the purpose of
protecting, enhancing or clarifying the rights of, and/or benefits to, the
holders of Rights.

Certain Anti-takeover 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. Takeover attempts frequently
include coercive tactics to deprive a corporation's Board of Directors and its
stockholders of any real opportunity to determine the destiny of the
corporation. 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 15%
or greater position to be followed by a merger or a partial or two-tier tender
offer that does not treat all stockholders equally. These tactics unfairly
pressure stockholders, squeeze them out of their investment without giving them
any real choice and deprive them of the full value of their shares.

         The Rights are not intended to prevent a takeover of the Company and
will not do so. The Rights are not exercisable in the event of a Permitted
Offer, as described above. The Rights may be redeemed by the Company at $0.01
per Right within ten days (or such later date as may be determined by a majority
of the Continuing Directors) after the accumulation of 15% or more of the
Company's outstanding Common Shares by a single acquiror or group. Accordingly,
the Rights should not preclude any merger or business combination approved by
the Board of Directors. Issuance of the Rights does not in any way weaken the
financial strength of the Company or interfere with its business plans. The
issuance of the Rights has no immediate dilutive effect, will not affect
reported earnings per share, should not be taxable to the Company or to its
stockholders and will not change the way in which the Company's shares are
presently traded. 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. However, the
Rights may have the effect of rendering more difficult or 




                                      -7-
<PAGE>   8

discouraging an acquisition of the Company deemed undesirable by the Board of
Directors. The Rights may cause substantial dilution to a person or group that
attempts to acquire the Company on terms or in a manner not approved by the
Company's Board of Directors, except pursuant to an offer conditioned upon the
negation, purchase or redemption of the Rights.

ITEM 2.  EXHIBITS.

         1.      Preferred Shares Rights Agreement, dated as of May 20,
                 1997, between Connetics Corporation and U.S. Stock
                 Transfer Corporation, including the Certificate of
                 Designation of Rights, Preferences and Privileges of
                 Series B Participating Preferred Stock, the form of
                 Rights Certificate and the Summary of Rights attached
                 thereto as Exhibits A, B and C, respectively.




                                      -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.

                                  CONNETICS CORPORATION


Date:  May 20, 1997               By  /s/ Cynthia M. Butitta
                                      ------------------------------------------
                                      Cynthia M. Butitta
                                      Vice President, Finance and Administration
                                      and Chief Financial Officer



                                      -9-
<PAGE>   10


                              CONNETICS CORPORATION

                       REGISTRATION STATEMENT ON FORM 8-A

                                  EXHIBIT INDEX




Exhibit
  No.                           Exhibit
- -------   ------------------------------------------------------

   1      Preferred Shares Rights Agreement, dated as of May 20,
          1997, between Connetics Corporation and U.S. Stock
          Transfer Corporation, including the Certificate of
          Designation of Rights, Preferences and Privileges of
          Series B Participating Preferred Stock, the form of
          Rights Certificate and the Summary of Rights attached
          thereto as Exhibits A, B and C, respectively.






                                      -10-

<PAGE>   1
                                                                       EXHIBIT 1


================================================================================



                              CONNETICS CORPORATION

                                       AND

                       THE U.S. STOCK TRANSFER CORPORATION

                                  RIGHTS AGENT






                        PREFERRED SHARES RIGHTS AGREEMENT







                            Dated as of May 20, 1997



================================================================================


<PAGE>   2


                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                                    Page
                                                                                    ----
<S>          <C>                                                                     <C>
SECTION 1    CERTAIN DEFINITIONS .....................................................1
SECTION 2    APPOINTMENT OF RIGHTS AGENT .............................................5
SECTION 3    ISSUANCE OF RIGHTS CERTIFICATE ..........................................5
SECTION 4    FORM OF RIGHTS CERTIFICATE ..............................................7
SECTION 5    COUNTERSIGNATURE AND REGISTRATION .......................................8
SECTION 6    TRANSFER, SPLIT UP, COMBINATION AND EXCHANGE OF RIGHTS CERTIFICATES; 
             MUTILATED, DESTROYED, LOST OR STOLEN RIGHTS CERTIFICATES ................8
SECTION 7    EXERCISE OF RIGHTS; PURCHASE PRICE; EXPIRATION DATE OF RIGHT ............9
SECTION 8    CANCELLATION AND DESTRUCTION OF RIGHTS CERTIFICATE .....................11
SECTION 9    RESERVATION AND AVAILABILITY OF PREFERRED SHARE ........................11
SECTION 10   PREFERRED SHARES RECORD DATE ...........................................13
SECTION 11   ADJUSTMENT OF PURCHASE PRICE, NUMBER OF SHARES OR NUMBER OF RIGHTS .....13
SECTION 12   CERTIFICATE OF ADJUSTED PURCHASE PRICE OR NUMBER OF SHARES .............21
SECTION 13   CONSOLIDATION, MERGER OR SALE OR TRANSFER OF ASSETS OR EARNING POWER ...21
SECTION 14   FRACTIONAL RIGHTS AND FRACTIONAL SHARES ................................24
SECTION 15   RIGHTS OF ACTION .......................................................24
SECTION 16   AGREEMENT OF RIGHTS HOLDERS ............................................25
SECTION 17   RIGHTS CERTIFICATE HOLDER NOT DEEMED A STOCKHOLDER .....................25
SECTION 18   CONCERNING THE RIGHTS AGENT ............................................26
SECTION 19   MERGER OR CONSOLIDATION OR CHANGE OF NAME OF RIGHTS AGENT ..............26
SECTION 20   DUTIES OF RIGHTS AGENT .................................................27
SECTION 21   CHANGE OF RIGHTS AGENT .................................................29
SECTION 22   ISSUANCE OF NEW RIGHTS CERTIFICATES ....................................30
SECTION 23   REDEMPTION .............................................................30
SECTION 24   EXCHANGE ...............................................................31
</TABLE>


<PAGE>   3

<TABLE>
<CAPTION>
                                                                                    Page
                                                                                    ----
<S>          <C>                                                                     <C>
SECTION 25   NOTICE OF CERTAIN EVENTS ...............................................33
SECTION 26   NOTICES ................................................................33
SECTION 27   SUPPLEMENTS AND AMENDMENTS .............................................34
SECTION 28   SUCCESSORS .............................................................34
SECTION 29   DETERMINATIONS AND ACTIONS BY THE BOARD OF DIRECTORS, ETC. .............34
SECTION 30   BENEFITS OF THIS AGREEMENT .............................................35
SECTION 31   SEVERABILITY ...........................................................35
SECTION 32   GOVERNING LAW ..........................................................35
SECTION 33   COUNTERPARTS ...........................................................36
SECTION 34   DESCRIPTIVE HEADINGS ...................................................36
</TABLE>

EXHIBITS

Exhibit A    Form of Certificate of Designation
Exhibit B    Form of Rights Certificate
Exhibit C    Summary of Rights








                                      -iii-
<PAGE>   4


                        PREFERRED SHARES RIGHTS AGREEMENT


         This Agreement is dated as of May 20, 1997, by and between Connetics
Corporation, a Delaware corporation, formerly Connective Therapeutics, Inc. (the
"COMPANY"), and the U.S. Stock Transfer Corporation, a California banking
corporation (the "RIGHTS AGENT").

         Effective as of April 29, 1997 (the "RIGHTS DIVIDEND DECLARATION
DATE"), the Board of Directors of the Company authorized and declared a dividend
of one Preferred Share purchase right (a "RIGHT") for each Common Share (as
hereinafter defined) of the Company outstanding as of the Close of Business (as
hereinafter defined) on May 20, 1997 (the "RECORD DATE"). Each Right represents
the right to purchase one one-thousandth (1/1000) of a share of Series B
Participating Preferred Stock (as such number may be adjusted pursuant to the
provisions of this Agreement), having the rights, preferences and privileges set
forth in the form of Certificate of Designation of Rights, Preferences and
Privileges of Series B Participating Preferred Stock attached hereto as Exhibit
A, subject to the terms and subject to the conditions herein set forth. The
Board of Directors of the Company further authorized and directed the issuance
of one Right (as such number may be adjusted pursuant to the provisions of this
Agreement) with respect to each Common Share that shall become outstanding
between the Record Date and the earlier of the Distribution Date and the
Expiration Date (as such terms are hereinafter defined), and in certain
circumstances after the Distribution Date.

         NOW, THEREFORE, in consideration of the promises and the mutual
agreements herein set forth, the parties hereby agree as follows:

         Section 1. Certain Definitions. For purposes of this Agreement, the
following terms have the meanings indicated:

                  (a) "ACQUIRING PERSON" shall mean any Person who or which,
together with all Affiliates and Associates of such Person, shall be the
Beneficial Owner of 15% or more of the Common Shares then outstanding, but shall
not include the Company, any Subsidiary of the Company or any employee benefit
plan of the Company or of any Subsidiary of the Company, or any entity holding
Common Shares for or pursuant to the terms of any such plan. Notwithstanding the
foregoing, no Person shall be deemed to be an Acquiring Person: (i) as the
result of an acquisition of Common Shares by the Company which, by reducing the
number of shares outstanding, increases the proportionate number of shares
beneficially owned by such Person to 15% or more of the Common Shares of the
Company then outstanding; provided, however, that if a Person shall become the
Beneficial Owner of 15% or more of the Common Shares of the Company then
outstanding by reason of share purchases by the Company and shall, after such
share purchases by the Company, become the Beneficial Owner of any additional
Common Shares of the Company, then such Person shall be deemed to be an
Acquiring Person, or (ii) if within eight days after such Person would otherwise
become an Acquiring Person (but for the operation of this clause (ii)), such
Person notifies the Board of Directors that such Person did so inadvertently and
within two days after such notification, such Person is the Beneficial Owner of
less than 15% of the outstanding Common Shares. Notwithstanding the foregoing:
(I) SmithKline Beecham Properties, Inc. ("SMITHKLINE") shall not be deemed to be
an Acquiring




<PAGE>   5

Person if such Person, together with all Affiliates and Associates of such
Person, becomes the Beneficial Owner of 15% or more of the Common Shares then
outstanding solely as a result of a further issuance of Common Shares to
SmithKline under the Stock Issuance Agreement dated December 31, 1996 by and
between the Company and SmithKline; and (II) Sprout Capital VII, L.P. ("SPROUT")
shall not be deemed to be an Acquiring Person if such Person, together with all
Affiliates and Associates of such Person, becomes the Beneficial Owner of 15% or
more of the Common Shares then outstanding solely as a result of an issuance of
Common Shares pursuant to agreements between Sprout and the Company entered into
on or before June 30, 1997.

                  (b) "AFFILIATE" and "ASSOCIATE" shall have the respective
meanings ascribed to such terms in Rule 12b-2 of the General Rules and
Regulations under the Securities and Exchange Act of 1934, as amended (the
"EXCHANGE ACT"), as in effect on the date of this Agreement.

                  (c) A Person shall be deemed the "BENEFICIAL OWNER" of and
shall be deemed to "BENEFICIALLY OWN" any securities:

                           (i)      which such Person or any of such Person's 
Affiliates or Associates beneficially owns, directly or indirectly, for purposes
of Section 13(d) of the Exchange Act and Rule 13d-3 thereunder (or any
comparable or successor law or regulation);

                           (ii)     which such Person or any of such Person's 
Affiliates or Associates has (A) the right to acquire (whether such right is
exercisable immediately or only after the passage of time) pursuant to any
agreement, arrangement or understanding (other than customary agreements with
and between underwriters and selling group members with respect to a bona fide
public offering of securities), or upon the exercise of conversion rights,
exchange rights, rights (other than the Rights), warrants or options, or
otherwise; provided, however, that a Person shall not be deemed pursuant to this
Section l(c)(ii)(A) the Beneficial Owner of, or to beneficially own, (1)
securities tendered pursuant to a tender or exchange offer made by or on behalf
of such Person or any of such Person's Affiliates or Associates until such
tendered securities are accepted for purchase or exchange, or (2) securities
which a Person or any of such Person's Affiliates or Associates may be deemed to
have the right to acquire pursuant to any merger or other acquisition agreement
between the Company and such Person (or one or more of its Affiliates or
Associates) if such agreement has been approved by the Board of Directors of the
Company prior to there being an Acquiring Person; or (B) the right to vote
pursuant to any agreement, arrangement or understanding; provided, however, that
a Person shall not be deemed the Beneficial Owner of, or to beneficially own,
any security under this Section l(c)(ii)(B) if the agreement, arrangement or
understanding to vote such security (1) arises solely from a revocable proxy or
consent given to such Person in response to a public proxy or consent
solicitation made pursuant to, and in accordance with, the applicable rules and
regulations of the Exchange Act and (2) is not also then reportable on Schedule
13D under the Exchange Act (or any comparable or successor report); or

                           (iii)    which are beneficially owned, directly or 
indirectly, by any other Person (or any Affiliate or Associate thereof) with
which such Person or any of such Person's 




                                      -2-
<PAGE>   6

Affiliates or Associates has any agreement, arrangement or understanding
(whether or not in writing) (other than customary agreements with and between
underwriters and selling group members with respect to a bona fide public
offering of securities) for the purpose of acquiring, holding, voting (except to
the extent contemplated by the proviso to Section l(c)(ii)(B)) or disposing of
any securities of the Company; provided, however, that in no case shall an
officer or director of the Company be deemed (x) the Beneficial Owner of any
securities beneficially owned by another officer or director of the Company
solely by reason of actions undertaken by such persons in their capacity as
officers or directors of the Company or (y) the Beneficial Owner of securities
held of record by the trustee of any employee benefit plan of the Company or any
Subsidiary of the Company for the benefit of any employee of the Company or any
Subsidiary of the Company, other than the officer or director, by reason of any
influence that such officer or director may have over the voting of the
securities held in the plan.

                  (d) "BUSINESS DAY" shall mean any day other than a Saturday,
Sunday or a day on which banking institutions in New York, New York are
authorized or obligated by law or executive order to close.

                  (e) "CLOSE OF BUSINESS" on any given date shall mean 5:00
P.M., New York, New York time, on such date; provided, however, that if such
date is not a Business Day it shall mean 5:00 P.M., New York, New York time, on
the next succeeding Business Day.

                  (f) "COMMON SHARES" when used with reference to the Company
shall mean the shares of Common Stock of the Company, $0.001 par value. "Common
Shares" when used with reference to any Person other than the Company shall mean
the capital stock (or equity interest) with the greatest voting power 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 Person.

                  (g) "CONTINUING DIRECTOR" shall mean (i) any member of the
Board of Directors of the Company, while a member of the Board, who is not an
Acquiring Person, or an Affiliate or Associate of an Acquiring Person, or a
representative of an Acquiring Person or of any such Affiliate or Associate, and
who was a member of the Board prior to the date of this Agreement, or (ii) any
Person who subsequently becomes a member of the Board, while a member of the
Board, who is not an Acquiring Person, or an Affiliate or Associate of an
Acquiring Person, or a representative of an Acquiring Person or of any such
Affiliate or Associate, if such Person's nomination for election or election to
the Board is recommended or approved by a majority of the Continuing Directors.

                  (h) "DISTRIBUTION DATE" shall mean the earlier of (i) the
Close of Business on the tenth day (or such later date as may be determined by
action of a majority of Continuing Directors then in office) after the Shares
Acquisition Date (or, if the tenth day after the Shares Acquisition Date occurs
before the Record Date, the Close of Business on the Record Date) or (ii) the
Close of Business on the tenth day (or such later date as may be determined by
action of a majority of Continuing Directors then in office) after the date that
a tender or exchange offer by any Person (other than the Company, any Subsidiary
of the Company, any employee benefit plan 




                                      -3-
<PAGE>   7

of the Company or of any Subsidiary of the Company, or any Person or entity
organized, appointed or established by the Company for or pursuant to the terms
of any such plan) is first published or sent or given within the meaning of Rule
14d-2(a) of the General Rules and Regulations under the Exchange Act, if,
assuming the successful consummation thereof, such Person would be the
Beneficial Owner of 15% or more of the shares of Common Stock then outstanding.

                  (i) "EQUIVALENT SHARES" shall mean Preferred Shares and any
other class or series of capital stock of the Company that is entitled to
participate in dividends and other distributions, including distributions upon
the liquidation, dissolution or winding up of the Company, on a proportional
basis with the Common Shares. In calculating the number of any class or series
of Equivalent Shares for purposes of Section 11 of this Rights Agreement, the
number of shares, or fractions of a share, of such class or series of capital
stock that is entitled to the same dividend or distribution as a whole Common
Share shall be deemed to be one share.

                  (j) "EXPIRATION DATE" shall mean the earliest of (i) the Close
of Business on the Final Expiration Date, (ii) the Redemption Date, (iii) the
time at which the Board of Directors orders the exchange of the Rights as
provided in Section 24 hereof or (iv) the consummation of a transaction
contemplated by Section 13(d) hereof.

                  (k) "FINAL EXPIRATION DATE" shall mean April 29, 2007.

                  (l) "PERMITTED OFFER" shall mean a tender offer for all
outstanding Common Shares made in the manner prescribed by Section 14(d) of the
Exchange Act and the rules and regulations promulgated thereunder; provided,
however, that such tender offer occurs at a time when Continuing Directors are
in office and a majority of the Continuing Directors then in office has
determined that the offer is both adequate and otherwise in the best interests
of the Company and its stockholders (taking into account all factors that such
Continuing Directors deem relevant, including without limitation prices that
could reasonably be achieved if the Company or its assets were sold on an
orderly basis designed to realize maximum value).

                  (m) "PERSON" shall mean any individual, firm, corporation or
other entity, and shall include any successor (by merger or otherwise) of such
entity.

                  (n) "PREFERRED SHARES" shall mean shares of Series B
Participating Preferred Stock of the Company.

                  (o) "PURCHASE PRICE" shall have the meaning set forth in
Section 4(a) hereof.

                  (p) "RECORD DATE" shall have the meaning set forth in the
recitals at the beginning of this Agreement.

                  (q) "REDEMPTION DATE" shall mean the time at which the Board
of Directors of the Company orders redemption of the Rights as provided in
Section 23 hereof.




                                      -4-
<PAGE>   8

                  (r) "REDEMPTION PRICE" shall have the meaning set forth in
Section 23(a) hereof.

                  (s) "RIGHTS DIVIDEND DECLARATION DATE" shall have the meaning
set forth in the recitals at the beginning of this Agreement.

                  (t) "SECTION 13 EVENT" shall mean any event described in
clause (i), (ii) or (iii) of Section 13(a) hereof.

                  (u) "SHARES ACQUISITION DATE" shall mean the first date of
public announcement (which, for purposes of this definition, shall include,
without limitation, a report filed pursuant to Section 13(d) under the Exchange
Act) by the Company or an Acquiring Person that an Acquiring Person has become
such; provided that, if such Person is determined not to have become an
Acquiring Person pursuant to Section l(a)(ii) hereof, then no Shares Acquisition
Date shall be deemed to have occurred.

                  (v) "SUBSIDIARY" of any Person shall mean any corporation or
other entity of which an amount of voting securities sufficient to elect a
majority of the directors or Persons having similar authority of such
corporation or other entity is beneficially owned, directly or indirectly, by
such Person, or any corporation or other entity otherwise controlled by such
Person.

                  (w) "TOTAL EXERCISE PRICE" shall have the meaning set forth in
Section 4(a) hereof.

                  (x) "TRADING DAY" shall have the meaning set forth in Section
11(d) hereof.

                  (y) A "TRIGGERING EVENT" shall be deemed to have occurred upon
any Person (other than the Company, any Subsidiary of the Company, any employee
benefit plan of the Company or any Subsidiary of the Company, or any entity
holding Common Shares for or pursuant to the terms of any such plan), together
with all Affiliates and Associates of such Person, becoming an Acquiring Person.

         Section 2. Appointment of Rights Agent. The Company hereby appoints the
Rights Agent to act as agent for the Company in accordance with the terms and
conditions hereof, and the Rights Agent hereby accepts such appointment. The
Company may from time to time appoint such co-Rights Agents as it may deem
necessary or desirable and shall notify promptly the Rights Agent in writing of
any such appointment. The Rights Agent shall have no duty to supervise, and
shall in no event be liable for the acts or omissions of any such co-Rights
Agent.

         Section 3. Issuance of Rights Certificates.

                  (a) Until the Distribution Date, (i) the Rights will be
evidenced (subject to the provisions of Sections 3(b) and 3(c) hereof) by the
certificates for Common Shares registered in the names of the holders thereof
(which certificates shall also be deemed to be Rights Certificates) and not by
separate Rights Certificates and (ii) the right to receive Rights 




                                      -5-
<PAGE>   9

Certificates will be transferable only in connection with the transfer of Common
Shares. Until the earlier of the Distribution Date or the Expiration Date, the
surrender for transfer of such certificates for Common Shares shall also
constitute the surrender for transfer of the Rights associated with the Common
Shares represented thereby. As soon as practicable after the Distribution Date,
the Company will prepare and execute, the Rights Agent will countersign, and the
Company will send or cause to be sent (and the Rights Agent will, at the request
and expense of the Company, send) by first-class, postage-prepaid mail, to each
record holder of Common Shares as of the close of business on the Distribution
Date, at the address of such holder shown on the records of the Company, a
Rights Certificate, in substantially the form of Exhibit B hereto (a "RIGHTS
CERTIFICATE"), evidencing one Right for each Common Share so held, subject to
adjustment as provided herein. In the event that an adjustment in the number of
Rights per Common Share has been made pursuant to Section 11(a)(i), Section
11(i) or Section 11(p) hereof, then at the time of distribution of the Rights
Certificates, the Company shall make the necessary and appropriate rounding
adjustments (in accordance with Section 14(a) hereof) so that Rights
Certificates representing only whole numbers of Rights are distributed and cash
is paid in lieu of any fractional Rights. As of the Distribution Date, the
Rights will be evidenced solely by such Rights Certificates and may be
transferred by the transfer of the Rights Certificates as permitted hereby,
separately and apart from any transfer of one or more Common Shares, and the
holders of such Rights Certificates as listed in the records of the Company or
any transfer agent or registrar for the Rights shall be the record holders
thereof.

                  (b) On the Record Date or as soon as practicable thereafter,
the Company will send a copy of a Summary of Rights in substantially the form of
Exhibit C hereto (the "SUMMARY OF RIGHTS"), by first-class, postage-prepaid
mail, to each record holder of Common Shares as of the close of business on the
Record Date, at the address of such holder shown on the records of the Company.

                  (c) Unless the Board of Directors by resolution adopted at or
before the time of the issuance (including pursuant to the exercise of rights
under the Company's benefit plans) of any Common Shares specifies to the
contrary, Rights shall be issued in respect of all Common Shares that are issued
after the Record Date but prior to the earlier of the Distribution Date or the
Expiration Date or, in certain circumstances provided in Section 22 hereof,
after the Distribution Date. Certificates representing such Common Shares shall
also be deemed to be certificates for Rights, and shall bear the following
legend:

         This certificate also evidences and entitles the holder hereof to
         certain rights as set forth in a Preferred Shares Rights Agreement
         between Connetics Corporation and the U.S. Stock Transfer Corporation
         as the Rights Agent, dated as of May 20, 1997 (the "RIGHTS AGREEMENT"),
         the terms of which are hereby incorporated herein by reference and a
         copy of which is on file at the principal executive offices of
         Connetics Corporation Under certain circumstances, as set forth in the
         Rights Agreement, such Rights will be evidenced by separate
         certificates and will no longer be evidenced by this certificate.
         Connetics Corporation will mail to the holder of this certificate a
         copy of the Rights Agreement without charge after receipt of a written
         request therefor. Under certain circumstances set forth in the Rights
         Agreement, Rights issued to, or held by, any Person 




                                      -6-
<PAGE>   10

         who is, was or becomes an Acquiring Person or any Affiliate or
         Associate thereof (as such terms are defined in the Rights Agreement),
         whether currently held by or on behalf of such Person or by any
         subsequent holder, may become null and void.

With respect to such certificates containing the foregoing legend, until the
earlier of (i) the Distribution Date or (ii) the Expiration Date, the Rights
associated with the Common Shares represented by such certificates shall be
evidenced by such certificates alone, and the surrender for transfer of any such
certificate shall also constitute the transfer of the Rights associated with the
Common Shares represented thereby. In the event that the Company purchases or
acquires any Common Shares after the Record Date but prior to the Distribution
Date, any Rights associated with such Common Shares shall be deemed canceled and
retired so that the Company shall not be entitled to exercise any Rights
associated with the Common Shares which are no longer outstanding.

         Section 4.  Form of Rights Certificates.

                  (a) The Rights Certificates (and the forms of election to
purchase Common Shares and of assignment to be printed on the reverse thereof)
shall be substantially in the form of Exhibit B hereto and may have such marks
of identification or designation and such legends, summaries or endorsements
printed thereon as the Company may deem appropriate and as are not inconsistent
with the provisions of this Agreement, or as may be required to comply with any
applicable law or with any rule or regulation made pursuant thereto or with any
rule or regulation of any stock exchange on which the Rights may from time to
time be listed, or to conform to usage. Subject to the provisions of Section 11
and Section 22 hereof, the Rights Certificates, whenever distributed, shall be
dated as of the Record Date (or in the case of Rights issued with respect to
Common Shares issued by the Company after the Record Date, as of the date of
issuance of such Common Shares), shall show the date of countersignature, and on
their face shall entitle the holders thereof to purchase such number of
one-thousandths of a Preferred Share as shall be set forth therein at the price
set forth therein (such exercise price per one one-thousandth of a Preferred
Share being hereinafter referred to as the "PURCHASE PRICE" and the aggregate
exercise price of all Preferred Shares issuable upon exercise of one Right being
hereinafter referred to as the "TOTAL EXERCISE PRICE"), but the number and type
of securities purchasable upon the exercise of each Right and the Purchase Price
shall be subject to adjustment as provided herein.

                  (b) Any Rights Certificate issued pursuant to Section 3(a) or
Section 22 hereof that represents Rights beneficially owned by: (i) an Acquiring
Person or any Associate or Affiliate of an Acquiring Person, (ii) a transferee
of an Acquiring Person (or of any such Associate or Affiliate) who becomes a
transferee after the Acquiring Person becomes such or (iii) a transferee of an
Acquiring Person (or of any such Associate or Affiliate) who becomes a
transferee prior to or concurrently with the Acquiring Person becoming such and
receives such Rights pursuant to either (A) a transfer (whether or not for
consideration) from the Acquiring Person to holders of equity interests in such
Acquiring Person or to any Person with whom such Acquiring Person has any
continuing agreement, arrangement or understanding regarding the transferred
Rights or (B) a transfer that the Board of Directors of the Company has
determined is part of a plan, arrangement or understanding that has as a primary
purpose or effect avoidance of 




                                      -7-
<PAGE>   11

Section 7(e) hereof, and any Rights Certificate issued pursuant to Section 6 or
Section 11 hereof upon transfer, exchange, replacement or adjustment of any
other Rights Certificate referred to in this sentence, shall contain (to the
extent feasible) the following legend:

         The Rights represented by this Rights Certificate are or were
         beneficially owned by a Person who was or became an Acquiring Person or
         an Affiliate or Associate of an Acquiring Person (as such terms are
         defined in the Rights Agreement). Accordingly, this Rights Certificate
         and the Rights represented hereby may become null and void in the
         circumstances specified in Section 7(e) of the Rights Agreement.

In the event that the Rights become exercisable, the Rights Agent and the
Company will agree upon a procedure for determining which Rights will be so
legended.

         Section 5.  Countersignature and Registration.

                  (a) The Rights Certificates shall be executed on behalf of the
Company by its Chairman of the Board, its Chief Executive Officer, its President
or any Vice President, either manually or by facsimile signature, and by the
Secretary or an Assistant Secretary of the Company, either manually or by
facsimile signature, and shall have affixed thereto the Company's seal (if any)
or a facsimile thereof. The Rights Certificates shall be manually countersigned
by an authorized signatory of the Rights Agent and shall not be valid for any
purpose unless countersigned. In case any officer of the Company who shall have
signed any of the Rights Certificates shall cease to be such officer of the
Company before countersignature by the Rights Agent and issuance and delivery by
the Company, such Rights Certificates, nevertheless, may be countersigned by the
Rights Agent and issued and delivered by the Company with the same force and
effect as though the person who signed such Rights Certificates had not ceased
to be such officer of the Company; and any Rights Certificate may be signed on
behalf of the Company by any person who, at the actual date of the execution of
such Rights Certificate, shall be a proper officer of the Company to sign such
Rights Certificate, although at the date of the execution of this Rights
Agreement any such person was not such an officer.

                  (b) Following the Distribution Date, the Rights Agent will
keep or cause to be kept, at its office designated for such purposes, books for
registration and transfer of the Rights Certificates issued hereunder. Such
books shall show the names and addresses of the respective holders of the Rights
Certificates, the number of Rights evidenced on its face by each of the Rights
Certificates and the date of each of the Rights Certificates.

         Section 6.  Transfer, Split Up, Combination and Exchange of Rights
Certificates; Mutilated, Destroyed, Lost or Stolen Rights Certificates.

                  (a) Subject to the provisions of Sections 7(e), 14 and 24
hereof, at any time after the Close of Business on the Distribution Date, and at
or prior to the Close of Business on the Expiration Date, any Rights Certificate
or Rights Certificates may be transferred, split up, combined or exchanged for
another Rights Certificate or Rights Certificates, entitling the registered
holder to purchase a like number of one-thousandths of a Preferred Share (or,
following a 




                                      -8-
<PAGE>   12

Triggering Event, other securities, cash or other assets, as the
case may be) as the Rights Certificate or Rights Certificates surrendered then
entitled such holder to purchase. Any registered holder desiring to transfer,
split up, combine or exchange any Rights Certificate or Rights Certificates
shall make such request in writing delivered to the Rights Agent, and shall
surrender the Rights Certificate or Rights Certificates to be transferred, split
up, combined or exchanged at the office of the Rights Agent designated for such
purpose. Neither the Rights Agent nor the Company shall be obligated to take any
action whatsoever with respect to the transfer of any such surrendered Rights
Certificate until the registered holder shall have completed and signed the
certificate contained in the form of assignment on the reverse side of such
Rights Certificate and shall have provided such additional evidence of the
identity of the Beneficial Owner (or former Beneficial Owner) or Affiliates or
Associates thereof as the Company shall reasonably request. Thereupon the Rights
Agent shall, subject to Sections 7(e), 14 and 24 hereof, countersign and deliver
to the person entitled thereto a Rights Certificate or Rights Certificates, as
the case may be, as so requested. The Company may require payment of a sum
sufficient to cover any tax or governmental charge that may be imposed in
connection with any transfer, split up, combination or exchange of Rights
Certificates.

                  (b) Upon receipt by the Company and the Rights Agent of
evidence reasonably satisfactory to them of the loss, theft, destruction or
mutilation of a Rights Certificate, and, in case of loss, theft or destruction,
of indemnity or security reasonably satisfactory to them, and, at the Company's
or the Rights Agent's request, reimbursement to the Company and the Rights Agent
of all reasonable expenses incidental thereto, and upon surrender to the Rights
Agent and cancellation of the Rights Certificate if mutilated, the Company will
make and deliver a new Rights Certificate of like tenor to the Rights Agent for
delivery to the registered holder in lieu of the Rights Certificate so lost,
stolen, destroyed or mutilated.

         Section 7.  Exercise of Rights; Purchase Price; Expiration Date of
Rights.

                  (a) Subject to Section 7(e) hereof, the registered holder of
any Rights Certificate may exercise the Rights evidenced thereby (except as
otherwise provided herein) in whole or in part at any time after the
Distribution Date upon surrender of the Rights Certificate, with the form of
election to purchase on the reverse side thereof duly executed, to the Rights
Agent at the office of the Rights Agent designated for such purpose, together
with payment of the Purchase Price for each one-thousandth of a Preferred Share
as to which the Rights are exercised, at or prior to the Expiration Date.

                  (b) The Purchase Price for each one-thousandth of a Preferred
Share issuable pursuant to the exercise of a Right shall initially be $49 and
shall be subject to adjustment from time to time as provided in Sections 11 and
13 hereof and shall be payable in lawful money of the United States of America
in accordance with paragraph (c) below.

                  (c) Upon receipt of a Rights Certificate representing
exercisable Rights, with the form of election to purchase duly executed,
accompanied by payment of the Purchase Price for the number of one-thousandths
of a Preferred Share (or other securities or property, as the case may be) to be
purchased and an amount equal to any applicable transfer tax required to be 




                                      -9-
<PAGE>   13

paid by the holder of such Rights Certificate in accordance with Section 9
hereof in cash, or by certified check or cashier's check payable to the order of
the Company, the Rights Agent shall, subject to Section 20(k) hereof, thereupon
promptly (i) (A) requisition from any transfer agent of the Preferred Shares (or
make available, if the Rights Agent is the transfer agent for the Preferred
Shares) a certificate or certificates for the number of one-thousandths of a
Preferred Share to be purchased and the Company hereby irrevocably authorizes
its transfer agent to comply with all such requests or (B) if the Company shall
have elected to deposit the total number of one-thousandths of a Preferred Share
issuable upon exercise of the Rights hereunder with a depository agent,
requisition from the depository agent of depository receipts representing such
number of one-thousandths of a Preferred Share as are to be purchased (in which
case certificates for the Preferred Shares represented by such receipts shall be
deposited by the transfer agent with the depository agent) and the Company
hereby directs the depository agent to comply with such request, (ii) when
appropriate, requisition from the Company the amount of cash to be paid in lieu
of issuance of fractional shares in accordance with Section 14 hereof, (iii)
after receipt of such certificates or depository receipts, cause the same to be
delivered to or upon the order of the registered holder of such Rights
Certificate, registered in such name or names as may be designated by such
holder and (iv) when appropriate, after receipt thereof, deliver such cash to or
upon the order of the registered holder of such Rights Certificate. The payment
of the Purchase Price (as such amount may be reduced (including to zero)
pursuant to Section 11(a)(iv) hereof) may be made in cash or by certified check
or cashier's check payable to the order of the Company. In the event that the
Company is obligated to issue other securities of the Company, pay cash and/or
distribute other property pursuant to Section 11(a) hereof, the Company will
make all arrangements necessary so that such other securities, cash and/or other
property are available for distribution by the Rights Agent, if and when
appropriate.

                  (d) In case the registered holder of any Rights Certificate
shall exercise less than all the Rights evidenced thereby, a new Rights
Certificate evidencing Rights equivalent to the Rights remaining unexercised
shall be issued by the Rights Agent to the registered holder of such Rights
Certificate or to his or her duly authorized assigns, subject to the provisions
of Section 14 hereof.

                  (e) Notwithstanding anything in this Agreement to the
contrary, from and after the first occurrence of a Triggering Event or a Section
13 Event, any Rights beneficially owned by (i) an Acquiring Person or an
Associate or Affiliate of an Acquiring Person, (ii) a transferee of an Acquiring
Person (or of any such Associate or Affiliate) who becomes a transferee after
the Acquiring Person becomes such (a "POST TRANSFEREE"), (iii) a transferee of
an Acquiring Person (or of any such Associate or Affiliate) who becomes a
transferee prior to or concurrently with the Acquiring Person becoming such and
receives such Rights pursuant to either (A) a transfer (whether or not for
consideration) from the Acquiring Person to holders of equity interests in such
Acquiring Person or to any Person with whom the Acquiring Person has any
continuing agreement, arrangement or understanding regarding the transferred
Rights or (B) a transfer which the Board of Directors of the Company has
determined is part of a plan, arrangement or understanding which has as a
primary purpose or effect the avoidance of this Section 7(e) (a "PRIOR
TRANSFEREE") or (iv) any subsequent transferee receiving transferred Rights from
a Post Transferee or a Prior Transferee, either directly or through one or more




                                      -10-
<PAGE>   14

intermediate transferees, shall become null and void without any further action
and no holder of such Rights shall have any rights whatsoever with respect to
such Rights, whether under any provision of this Agreement or otherwise. The
Company shall use all reasonable efforts to insure that the provisions of this
Section 7(e) and Section 4(b) hereof are complied with, but shall have no
liability to any holder of Rights Certificates or to any other Person as a
result of its failure to make any determinations with respect to an Acquiring
Person or any of such Acquiring Person's Affiliates, Associates or transferees
hereunder.

                  (f) Notwithstanding anything in this Agreement to the
contrary, neither the Rights Agent nor the Company shall be obligated to
undertake any action with respect to a registered holder upon the occurrence of
any purported exercise as set forth in this Section 7 unless such registered
holder shall have (i) completed and signed the certificate contained in the form
of election to purchase set forth on the reverse side of the Rights Certificate
surrendered for such exercise and (ii) provided such additional evidence of the
identity of the Beneficial Owner (or former Beneficial Owner) or Affiliates or
Associates thereof as the Company shall reasonably request.

         Section 8.  Cancellation and Destruction of Rights Certificates. All
Rights Certificates surrendered for the purpose of exercise, transfer, split up,
combination or exchange shall, if surrendered to the Company or to any of its
agents, be delivered to the Rights Agent for cancellation or in canceled form,
or, if surrendered to the Rights Agent, shall be canceled by it, and no Rights
Certificates shall be issued in lieu thereof except as expressly permitted by
any of the provisions of this Agreement. The Company shall deliver to the Rights
Agent for cancellation and retirement, and the Rights Agent shall so cancel and
retire, any other Rights Certificate purchased or acquired by the Company
otherwise than upon the exercise thereof. The Rights Agent shall deliver all
canceled Rights Certificates to the Company, or shall, at the written request of
the Company and consistent with the internal policies of the Rights Agent,
destroy such canceled Rights Certificates, and in such case shall deliver a
certificate of destruction thereof to the Company.

         Section 9.  Reservation and Availability of Preferred Shares.

                  (a) The Company covenants and agrees that it will use its best
efforts to cause to be reserved and kept available out of and to the extent of
its authorized and unissued shares of Preferred Stock not reserved for another
purpose (and, following the occurrence of a Triggering Event, out of its
authorized and unissued shares of Common Stock and/or other securities), the
number of Preferred Shares (and, following the occurrence of the Triggering
Event, Common Stock and/or other securities) that will be sufficient to permit
the exercise in full of all outstanding Rights.

                  (b) If the Company shall hereafter list any of its Preferred
Shares on a national securities exchange, then so long as the Preferred Shares
(and, following the occurrence of a Triggering Event, Common Shares and/or other
securities) issuable and deliverable upon exercise of the Rights may be listed
on a national securities exchange, the Company shall use its best efforts to
cause, from and after such time as the Rights become exercisable (but only to
the




                                      -11-
<PAGE>   15

extent that it is reasonably likely that the Rights will be exercised), all
shares reserved for such issuance to be listed on such exchange upon official
notice of issuance upon such exercise.

                  (c) The Company shall use its best efforts to (i) file, as
soon as practicable following the earliest date after the first occurrence of a
Triggering Event in which the consideration to be delivered by the Company upon
exercise of the Rights has been determined in accordance with Section 11(a)(iv)
hereof, or as soon as is required by law following the Distribution Date, as the
case may be, a registration statement under the Securities Act of 1933, as
amended (the "SECURITIES ACT"), with respect to the securities purchasable upon
exercise of the Rights on an appropriate form, (ii) cause such registration
statement to become effective as soon as practicable after such filing and (iii)
cause such registration statement to remain effective (with a prospectus at all
times meeting the requirements of the Securities Act) until the earlier of (A)
the date as of which the Rights are no longer exercisable for such securities
and (B) the date of expiration of the Rights. The Company may temporarily
suspend, for a period not to exceed ninety (90) days after the date set forth in
clause (i) of the first sentence of this Section 9(c), the exercisability of the
Rights in order to prepare and file such registration statement and permit it to
become effective. Upon any such suspension, the Company shall issue a public
announcement stating, and notify the Rights Agent, that the exercisability of
the Rights has been temporarily suspended, as well as a public announcement and
notification to the Rights Agent at such time as the suspension is no longer in
effect. The Company will also take such action as may be appropriate under, or
to ensure compliance with, the securities or "blue sky" laws of the various
states in connection with the exercisability of the Rights. Notwithstanding any
provision of this Agreement to the contrary, the Rights shall not be exercisable
in any jurisdiction, unless the requisite qualification in such jurisdiction
shall have been obtained, or an exemption therefrom shall be available, and
until a registration statement has been declared effective. The Company will
notify the Rights Agent in writing of the jurisdictions in which Rights shall
not be exercisable pursuant to the preceding sentence.

                  (d) The Company covenants and agrees that it will take all
such action as may be necessary to ensure that all Preferred Shares delivered
upon exercise of Rights shall, at the time of delivery of the certificates for
such Preferred Shares (subject to payment of the Purchase Price), be duly and
validly authorized and issued and fully paid and nonassessable shares.

                  (e) The Company further covenants and agrees that it will pay
when due and payable any and all federal and state transfer taxes and charges
which may be payable in respect of the original issuance or delivery of the
Rights Certificates or of any Preferred Shares upon the exercise of Rights. The
Company shall not, however, be required to pay any transfer tax which may be
payable in respect of any transfer or delivery of Rights Certificates to a
person other than, or the issuance or delivery of certificates or depository
receipts for the Preferred Shares in a name other than that of, the registered
holder of the Rights Certificate evidencing Rights surrendered for exercise or
to issue or to deliver any certificates or depository receipts for Preferred
Shares upon the exercise of any Rights until any such tax shall have been paid
(any such tax being payable by the holder of such Rights Certificate at the time
of surrender) or until it has been established to the Company's satisfaction
that no such tax is due.




                                      -12-
<PAGE>   16

         Section 10. Preferred Shares Record Date. Each person in whose name any
certificate for a number of one-thousandths of a Preferred Share is issued upon
the exercise of Rights shall for all purposes be deemed to have become the
holder of record of Preferred Shares represented thereby on, and such
certificate shall be dated, the date upon which the Rights Certificate
evidencing such Rights was duly surrendered and payment of the Purchase Price
multiplied by the number of one-thousandths of a Preferred Share with respect to
which the Rights have been exercised (and any applicable transfer taxes) was
made; provided, however, that if the date of such surrender and payment is a
date upon which the Preferred Shares transfer books of the Company are closed,
such person shall be deemed to have become the record holder of such shares on,
and such certificate shall be dated, the next succeeding Business Day on which
the Preferred Shares transfer books of the Company are open. Prior to the
exercise of the Rights evidenced thereby, the holder of a Rights Certificate
shall not be entitled to any rights of a holder of Preferred Shares for which
the Rights shall be exercisable, including, without limitation, the right to
vote, to receive dividends or other distributions or to exercise any preemptive
rights, and shall not be entitled to receive any notice of any proceedings of
the Company, except as provided herein.

         Section 11. Adjustment of Purchase Price, Number of Shares or Number of
Rights. The Purchase Price, the number and kind of shares or other property
covered by each Right and the number of Rights outstanding are subject to
adjustment from time to time as provided in this Section 11.

                  (a) (i) In the event the Company shall at any time after the
date of this Agreement (A) declare a dividend on the Common Shares payable in
Common Shares, (B) subdivide the outstanding Common Shares, (C) combine the
outstanding Common Shares (by reverse stock split or otherwise) into a smaller
number of Common Shares, or (D) issue any shares of its capital stock in a
reclassification of the Common Shares (including any such reclassification in
connection with a consolidation or merger in which the Company is the continuing
or surviving corporation), then, in each such event, except as otherwise
provided in this Section 11(a) and Section 7(e) hereof: (1) each of the Rights
outstanding at the time of the record date for such dividend or the effective
date of such subdivision, combination or reclassification shall be
proportionately adjusted to that number of Rights (calculated to the nearest one
ten-thousandth (1/10,000) of a Right) equal to a fraction (the "EXCHANGE
RATIO"), the numerator of which shall be the total number of Common Shares or
shares of capital stock issued in such reclassification of the Common Shares
outstanding immediately following such time and the denominator of which shall
be the total number of Common Shares outstanding immediately prior to such time,
and the number of Rights that shall thereafter be issued with respect to each
Common Share or share of such other capital stock that shall become outstanding
thereafter prior to the Distribution Date shall be equal to the total number of
outstanding Rights immediately after such event (as adjusted pursuant to this
clause (1)) divided by the total number of outstanding Common Shares or shares
of such other capital stock immediately after such event (subject to further
adjustment pursuant to the provisions of this Agreement); (2) the Purchase Price
in effect at the time of the record date for such dividend or of the effective
date of such subdivision, combination or reclassification shall be adjusted so
that the Purchase Price thereafter shall equal the result obtained by dividing
the Purchase Price in effect immediately prior to such 




                                      -13-
<PAGE>   17

time by the Exchange Ratio; provided, however, that in no event shall the
consideration to be paid upon the exercise of one Right be less than the
aggregate par value of the shares of capital stock of the Company issuable upon
exercise of such Right; and (3) the number of Preferred Shares or shares of such
other capital stock issuable upon the exercise of each Right shall remain
unchanged immediately after such event, but, in the event of a reclassification,
the kind of shares issuable upon the exercise of each Right immediately after
such reclassification shall be adjusted to be the kind of shares of such other
capital stock issued in such reclassification, rather than Preferred Shares. If
an event occurs which would require an adjustment under both this Section
11(a)(i) and Section 11(a)(ii) hereof, the adjustment provided for in this
Section 11(a)(i) shall be in addition to, and shall be made prior to, any
adjustment required pursuant to Section 11(a)(ii) hereof.

                           (ii)     Subject to Section 24 of this Agreement, in 
the event a Triggering Event shall have occurred, then promptly following such
Triggering Event, proper provision shall be made so that each holder of a Right,
except as provided in Section 7(e) hereof, shall thereafter have the right to
receive for each Right, upon exercise thereof in accordance with the terms of
this Agreement and payment of the then-current Total Exercise Price, in lieu of
a number of one-thousandths of a Preferred Share, such number of Common Shares
of the Company as shall equal the result obtained by multiplying the
then-current Purchase Price by the then number of one-thousandths of a Preferred
Share for which a Right was exercisable (or would have been exercisable if the
Distribution Date had occurred) immediately prior to the first occurrence of a
Triggering Event, and dividing that product by 50% of the current per share
market price (determined pursuant to Section 11(d) hereof) for Common Shares on
the date of occurrence of the Triggering Event (such number of shares being
hereinafter referred to as the "ADJUSTMENT SHARES").

                           (iii)    The right to buy Common Shares of the 
Company pursuant to Section 11(a)(ii) hereof shall not arise as a result of any
Person becoming an Acquiring Person through an acquisition of Common Shares
pursuant to a Permitted Offer.

                           (iv)     In lieu of issuing Common Shares in 
accordance with Section 11(a)(ii) hereof, the Company may, if the Board of
Directors determines that such action is necessary or appropriate and not
contrary to the interest of holders of Rights (and, in the event that the number
of Common Shares which are authorized by the Company's Certificate of
Incorporation but not outstanding or reserved for issuance for purposes other
than upon exercise of the Rights are not sufficient to permit the exercise in
full of the Rights, or if any necessary regulatory approval for such issuance
has not been obtained by the Company, the Company shall): (A) determine the
excess of (1) the value of the Common Shares issuable upon the exercise of a
Right (the "CURRENT VALUE") over (2) the Purchase Price (such excess, the
"SPREAD") and (B) with respect to each Right, make adequate provision to
substitute for such Common Shares, upon exercise of the Rights, (1) cash, (2) a
reduction in the Purchase Price, (3) other equity securities of the Company
(including, without limitation, shares or units of shares of any series of
Preferred Stock which the Board of Directors of the Company has deemed to have
the same value as Common Shares (such shares or units of shares of Preferred
Stock are herein called "COMMON STOCK EQUIVALENTS")), except to the extent that
the Company has not obtained 




                                      -14-
<PAGE>   18

any necessary stockholder or regulatory approval for such issuance, (4) debt
securities of the Company, except to the extent that the Company has not
obtained any necessary stockholder or regulatory approval for such issuance, (5)
other assets or (6) any combination of the foregoing, having an aggregate value
equal to the Current Value, where such aggregate value has been determined by
the Board of Directors of the Company based upon the advice of a nationally
recognized investment banking firm selected by the Board of Directors of the
Company; provided, however, if the Company shall not have made adequate
provision to deliver value pursuant to clause (B) above within thirty (30) days
following the later of (x) the first occurrence of a Triggering Event and (y)
the date on which the Company's right of redemption pursuant to Section 23(a)
expires (the later of (x) and (y) being referred to herein as the "SECTION
11(A)(II) TRIGGER DATE"), then the Company shall be obligated to deliver, upon
the surrender for exercise of a Right and without requiring payment of the
Purchase Price, Common Shares (to the extent available), except to the extent
that the Company has not obtained any necessary stockholder or regulatory
approval for such issuance, and then, if necessary, cash, which shares and/or
cash have an aggregate value equal to the Spread. If the Board of Directors of
the Company shall determine in good faith that it is likely that sufficient
additional Common Shares could be authorized for issuance upon exercise in full
of the Rights or that any necessary regulatory approval for such issuance will
be obtained, the thirty (30) day period set forth above may be extended to the
extent necessary, but not more than ninety (90) days after the Section 11(a)(ii)
Trigger Date, in order that the Company may seek stockholder approval for the
authorization of such additional shares or take action to obtain such regulatory
approval (such period, as it may be extended, the "SUBSTITUTION PERIOD"). To the
extent that the Company determines that some action need be taken pursuant to
the first and/or second sentences of this Section 11(a)(iv), the Company (x)
shall provide, subject to Section 7(e) hereof, that such action shall apply
uniformly to all outstanding Rights and (y) may suspend the exercisability of
the Rights until the expiration of the Substitution Period in order to seek any
authorization of additional shares, to take any action to obtain any required
regulatory approval and/or to decide the appropriate form of distribution to be
made pursuant to such first sentence and to determine the value thereof. In the
event of any such suspension, the Company shall issue a public announcement
stating, and shall notify the Rights Agent, that the exercisability of the
Rights has been temporarily suspended, as well as a public announcement, and
notification to the Right Agent, at such time as the suspension is no longer in
effect. For purposes of this Section 11(a)(iv), the value of the Common Shares
shall be the current per share market price (as determined pursuant to Section
11(d) hereof) of the Common Shares on the Section 11(a)(ii) Trigger Date and the
value of any "common stock equivalent" shall be deemed to have the same value as
the Common Shares on such date.

                  (b) In case the Company shall, at any time after the date of
this Agreement, fix a record date for the issuance of rights, options or
warrants to all holders of Common Shares or of any class or series of Equivalent
Shares entitling such holders (for a period expiring within forty-five (45)
calendar days after such record date) to subscribe for or purchase Common Shares
or Equivalent Shares or securities convertible into Common Shares or Equivalent
Shares at a price per share (or having a conversion price per share, if a
security convertible into Common Shares or Equivalent Shares) less than the then
current per share market price of the Common Shares or Equivalent Shares (as
defined in Section 11(d)) on such record date, then, in each such 




                                      -15-
<PAGE>   19

case, the Purchase Price to be in effect after such record date shall be
determined by multiplying the Purchase Price in effect immediately prior to such
record date by a fraction, the numerator of which shall be the number of Common
Shares and Equivalent Shares (if any) outstanding on such record date, plus the
number of Common Shares or Equivalent Shares, as the case may be, which the
aggregate offering price of the total number of Common Shares or Equivalent
Shares, as the case may be, so to be offered (and/or the aggregate initial
conversion price of the convertible securities so to be offered) would purchase
at such current market price, and the denominator of which shall be the number
of Common Shares and Equivalent Shares (if any) outstanding on such record date,
plus the number of additional Common Shares or Equivalent Shares, as the case
may be, to be offered for subscription or purchase (or into which the
convertible securities so to be offered are initially convertible). In case such
subscription price may be paid in a consideration part or all of which shall be
in a form other than cash, the value of such consideration shall be as
determined in good faith by the Board of Directors of the Company, whose
determination shall be described in a statement filed with the Rights Agent and
shall be binding on the Rights Agent and the holders of the Rights. Common
Shares and Equivalent Shares owned by or held for the account of the Company
shall not be deemed outstanding for the purpose of any such computation. Such
adjustment shall be made successively whenever such a record date is fixed, and
in the event that such rights, options or warrants are not so issued, the
Purchase Price shall be adjusted to be the Purchase Price which would then be in
effect if such record date had not been fixed.

                  (c) In case the Company shall, at any time after the date of
this Agreement, fix a record date for the making of a distribution to all
holders of the Common Shares or of any class or series of Equivalent Shares
(including any such distribution made in connection with a consolidation or
merger in which the Company is the continuing or surviving corporation) of
evidences of indebtedness or assets (other than a regular quarterly cash
dividend, if any, or a dividend payable in Common Shares) or subscription
rights, options or warrants (excluding those referred to in Section 11(b)),
then, in each such case, the Purchase Price to be in effect after such record
date shall be determined by multiplying the Purchase Price in effect immediately
prior to such record date by a fraction, the numerator of which shall be the
current market price (as determined pursuant to Section 11(d) hereof) of a
Common Share or an Equivalent Share on such record date, less the fair market
value (as determined in good faith by the Board of Directors of the Company,
whose determination shall be described in a statement filed with the Rights
Agent) of the portion of the cash, assets or evidences of indebtedness so to be
distributed or of such subscription rights or warrants applicable to a Common
Share or Equivalent Share, as the case may be, and the denominator of which
shall be such current market price (as determined pursuant to Section 11(d)
hereof) of a Common Share or Equivalent Share on such record date. Such
adjustments shall be made successively whenever such a record date is fixed, and
in the event that such distribution is not so made, the Purchase Price shall be
adjusted to be the Purchase Price which would have been in effect if such record
date had not been fixed.

                  (d) For the purpose of any computation hereunder, other than
computations made pursuant to Section 11(a)(iv) hereof, the "CURRENT PER SHARE
MARKET PRICE" of any security (a "SECURITY" for the purpose of this Section
11(d)) on any date shall be deemed to be the average of the daily closing prices
per share of such Security for the thirty (30) consecutive 




                                      -16-
<PAGE>   20

Trading Days (as such term is hereinafter defined) immediately prior to such
date, and for purposes of computations made pursuant to Section 11(a)(iv)
hereof, the "current per share market price" of any Security on any date shall
be deemed to be the average of the daily closing prices per share of such
Security for the ten (10) consecutive Trading Days immediately prior to such
date; provided, however, that in the event that the current per share market
price of the Security is determined during a period following the announcement
by the issuer of such Security of (i) a dividend or distribution on such
Security payable in shares of such Security or securities convertible into such
shares or (ii) any subdivision, combination or reclassification of such
Security, and prior to the expiration of the requisite thirty (30) Trading Day
or ten (10) Trading Day period, after the ex-dividend date for such dividend or
distribution, or the record date for such subdivision, combination or
reclassification, then, and in each such case, the current per share market
price shall be appropriately adjusted to reflect the current market price per
share equivalent of such Security. The closing price for each day shall be the
last sale price, regular way, or, in case no such sale takes place on such day,
the average of the closing bid and asked prices, regular way, in either case as
reported in the principal consolidated transaction reporting system with respect
to securities listed or admitted to trading on the New York Stock Exchange or,
if the Security is not listed or admitted to trading on the New York Stock
Exchange, as reported in the principal consolidated transaction reporting system
with respect to securities listed on the principal national securities exchange
on which the Security is listed or admitted to trading or, if the Security is
not listed or admitted to trading on any national securities exchange, the last
sale price or, if such last sale price is not reported, the average of the high
bid and low asked prices in the over-the-counter market, as reported by the
National Association of Securities Dealers Automated Quotation ("NASDAQ") system
or such other system then in use, or, if on any such date the Security is not
quoted by any such organization, the average of the closing bid and asked prices
as furnished by a professional market maker making a market in the Security
selected by the Board of Directors of the Company. If on any such date no market
maker is making a market in the Common Shares, the fair value of such shares on
such date as determined in good faith by the Board of Directors of the Company
shall be used. The term "TRADING DAY" shall mean a day on which the principal
national securities exchange on which the Security is listed or admitted to
trading is open for the transaction of business or, if the Security is not
listed or admitted to trading on any national securities exchange, a Business
Day. If the Common Shares are not publicly held or so listed or traded, "current
per share market price" shall mean the fair value per share as determined in
good faith by the Board of Directors of the Company, whose determination shall
be described in a statement filed with the Rights Agent and shall be conclusive
for all purposes.

                  (e) Anything herein to the contrary notwithstanding, no
adjustment in the Purchase Price shall be required unless such adjustment would
require an increase or decrease of at least 1% in the Purchase Price; provided,
however, that any adjustments which by reason of this Section 11(e) are not
required to be made shall be carried forward and taken into account in any
subsequent adjustment. All calculations under this Section 11 shall be made to
the nearest cent or to the nearest ten-thousandth of a Common Share or other
share or one hundred-thousandth of a Preferred Share, as the case may be.
Notwithstanding the first sentence of this Section 11(e), any adjustment
required by this Section 11 shall be made no later than the earlier 




                                      -17-
<PAGE>   21

of (i) three (3) years from the date of the transaction which requires such
adjustment or (ii) the Expiration Date.

                  (f) If as a result of an adjustment made pursuant to Section
11(a) or 13(a) hereof, the holder of any Right thereafter exercised shall become
entitled to receive any shares of capital stock other than Preferred Shares,
thereafter the number of such other shares so receivable upon exercise of any
Right and if required, the Purchase Price thereof, shall be subject to
adjustment from time to time in a manner and on terms as nearly equivalent as
practicable to the provisions with respect to the Common Shares contained in
Sections 11(a), (b), (c), (e), (h), (i), (j), (k), (1) and (m), and the
provisions of Sections 7, 9, 10, 13 and 14 with respect to the Preferred Shares
shall apply on like terms to any such other shares.

                  (g) All Rights originally issued by the Company subsequent to
any adjustment made to the Purchase Price hereunder shall evidence the right to
purchase, at the adjusted Purchase Price, the number of one-thousandths of a
Preferred Share purchasable from time to time hereunder upon exercise of the
Rights, all subject to further adjustment as provided herein.

                  (h) Unless the Company shall have exercised its election as
provided in Section 11(i), upon each adjustment of the Purchase Price as a
result of the calculations made in Section 11(b), each Right outstanding
immediately prior to the making of such adjustment shall thereafter evidence the
right to purchase, at the adjusted Purchase Price, that number of Preferred
Shares (calculated to the nearest one hundred-thousandth of a share) obtained by
(i) multiplying (x) the number of Preferred Shares covered by a Right
immediately prior to this adjustment, by (y) the Purchase Price in effect
immediately prior to such adjustment of the Purchase Price, and (ii) dividing
the product so obtained by the Purchase Price in effect immediately after such
adjustment of the Purchase Price.

                  (i) The Company may elect on or after the date of any
adjustment of the Purchase Price as a result of the calculations made in Section
11(b) to adjust the number of Rights, in substitution for any adjustment in the
number of Preferred Shares purchasable upon the exercise of a Right. Each of the
Rights outstanding after such adjustment of the number of Rights shall be
exercisable for the number of one-thousandths of a Preferred Share 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 that number
of Rights (calculated to the nearest ten-thousandth) obtained by dividing the
Purchase Price in effect immediately prior to adjustment of the Purchase Price
by the Purchase Price in effect immediately after adjustment of the Purchase
Price. The Company shall make a public announcement, and shall notify the Rights
Agent, 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 may be the date on which the Purchase Price is
adjusted or any day thereafter, but, if the Rights Certificates have been
issued, shall be at least ten (10) 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 Section 11(i), the Company shall, as
promptly as practicable, cause to be distributed to holders of record of Rights
Certificates on such record date Rights Certificates evidencing, subject to
Section 14 hereof, the additional Rights to which such holders shall be 




                                      -18-
<PAGE>   22

entitled as a result of such adjustment, or, at the option of the Company, 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 Company, 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 Company, the adjusted Purchase Price) and shall be
registered in the names of the holders of record of Rights Certificates on the
record date specified in the public announcement.

                  (j) Irrespective of any adjustment or change in the Purchase
Price or the number of Preferred Shares issuable upon the exercise of the
Rights, the Rights Certificates theretofore and thereafter issued may continue
to express the Purchase Price per one one-thousandth of a Preferred Share and
the number of one-thousandths of a Preferred Share which were expressed in the
initial Rights Certificates issued hereunder.

                  (k) Before taking any action that would cause an adjustment
reducing the Purchase Price below the par or stated value, if any, of the number
of one-thousandths of a Preferred Share issuable upon exercise of the Rights,
the Company shall take any corporate action which may, in the opinion of its
counsel, be necessary in order that the Company may validly and legally issue as
fully paid and nonassessable shares such number of one-thousandths of a
Preferred Share at such adjusted Purchase Price.

                  (1) In any case in which this Section 11 shall require that an
adjustment in the Purchase Price be made effective as of a record date for a
specified event, the Company may elect to defer until the occurrence of such
event the issuing to the holder of any Right exercised after such record date of
the number of one-thousandths of a Preferred Share and other capital stock or
securities of the Company, if any, issuable upon such exercise over and above
the number of one-thousandths of a Preferred Share and other capital stock or
securities of the Company, if any, issuable upon such exercise on the basis of
the Purchase Price in effect prior to such adjustment; provided, however, that
the Company shall deliver to such holder a due bill or other appropriate
instrument evidencing such holder's right to receive such additional shares
(fractional or otherwise) upon the occurrence of the event requiring such
adjustment.

                  (m) Anything in this Section 11 to the contrary
notwithstanding, prior to the Distribution Date, the Company shall be entitled
to make such reductions in the Purchase Price, in addition to those adjustments
expressly required by this Section 11, as and to the extent that it in its sole
discretion shall determine to be advisable in order that any (i) consolidation
or subdivision of the Preferred or Common Shares, (ii) issuance wholly for cash
of any Preferred or Common Shares at less than the current market price, (iii)
issuance wholly for cash of Preferred or Common Shares or securities which by
their terms are convertible into or exchangeable for Preferred or Common Shares,
(iv) stock dividends or (v) issuance of rights, options or warrants referred to
in this Section 11, hereafter made by the Company to holders of its Preferred or
Common Shares shall not be taxable to such stockholders.




                                      -19-
<PAGE>   23

                  (n) The Company covenants and agrees that it shall not, at any
time after the Distribution Date, effect or permit to occur any Triggering Event
or Section 13 Event, if (i) at the time or immediately after such Triggering
Event or Section 13 Event there are any rights, warrants or other instruments or
securities outstanding or agreements in effect which would substantially
diminish or otherwise eliminate the benefits intended to be afforded by the
Rights or (ii) prior to, simultaneously with or immediately after such Section
13 Event, the stockholders of the Person who constitutes, or would constitute,
the "Principal Party" for purposes of Section 13(b) hereof shall have received a
distribution of Rights previously owned by such Person or any of its Affiliates
and Associates.

                  (o) The Company covenants and agrees that, after the
Distribution Date, it will not, except as permitted by Sections 23, 24 or 27
hereof, take (or permit to be taken) 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.

                  (p) Anything in this Agreement to the contrary
notwithstanding, in the event the Company shall at any time after the date of
this Agreement (A) declare a dividend on the Preferred Shares payable in
Preferred Shares, (B) subdivide the outstanding Preferred Shares, (C) combine
the outstanding Preferred Shares (by reverse stock split or otherwise) into a
smaller number of Preferred Shares, or (D) issue any shares of its capital stock
in a reclassification of the Preferred Shares (including any such
reclassification in connection with a consolidation or merger in which the
Company is the continuing or surviving corporation), then, in each such event,
except as otherwise provided in this Section 11 and Section 7(e) hereof: (1)
each of the Rights outstanding at the time of the record date for such dividend
or the effective date of such subdivision, combination or reclassification shall
be proportionately adjusted to that number of Rights (calculated to the nearest
one ten-thousandth (1/10,000) of a Right) equal to a fraction (the "EXCHANGE
FRACTION"), the numerator of which shall be the total number of Preferred Shares
or shares of capital stock issued in such reclassification of the Preferred
Shares outstanding immediately following such time and the denominator of which
shall be the total number of Preferred Shares outstanding immediately prior to
such time, and the number of Rights that shall thereafter be issued with respect
to each Common Share or share of other capital stock that shall be issued in a
reclassification of the Common Shares prior to the Distribution Date shall be
equal to the total number of outstanding Rights immediately after such event (as
adjusted pursuant to this clause (1)) divided by the total number of outstanding
Common Shares or shares of such other capital stock immediately after such event
(subject to further adjustment pursuant to the provisions of this Agreement);
(2) the Purchase Price in effect at the time of the record date for such
dividend or of the effective date of such subdivision, combination or
reclassification shall be adjusted so that the Purchase Price thereafter shall
equal the result obtained by dividing the Purchase Price in effect immediately
prior to such time by the Exchange Fraction; provided, however, that in no event
shall the consideration to be paid upon the exercise of one Right be less than
the aggregate par value of the shares of capital stock of the Company issuable
upon exercise of such Right; and (3) the number of one-thousandths of a
Preferred Share or share of such other capital stock issuable upon the exercise
of each Right shall remain unchanged immediately after such event, but, in the
event of a reclassification, the kind of shares issuable upon the exercise of




                                      -20-
<PAGE>   24

each Right immediately after such reclassification shall be adjusted to be the
kind of shares of such other capital stock issued in such reclassification,
rather than Preferred Shares.

         Section 12. Certificate of Adjusted Purchase Price or Number of Shares.
Whenever an adjustment is made as provided in Sections 11 and 13 hereof, the
Company shall promptly (a) prepare a certificate setting forth such adjustment
and a brief statement of the facts accounting for such adjustment, (b) file with
the Rights Agent and with each transfer agent for the Preferred Shares a copy of
such certificate and (c) mail a brief summary thereof to each holder of a Rights
Certificate in accordance with Section 26 hereof. Notwithstanding the foregoing
sentence, the failure of the Company to make such certification or give such
notice shall not affect the validity of such adjustment or the force or effect
of the requirement for such adjustment. The Rights Agent shall be fully
protected in relying on any such certificate and on any adjustment contained
therein and shall not be deemed to have knowledge of such adjustment unless and
until it shall have received such certificate.

         Section 13. Consolidation, Merger or Sale or Transfer of Assets or 
Earning Power.

                  (a)      In the event that, following the Shares Acquisition 
Date, directly or indirectly:

                           (i)      the Company shall consolidate with, or merge
with and into, any other Person (other than a Subsidiary of the Company in a
transaction the principal purpose of which is to change the state of
incorporation of the Company or that complies with Section 11(o) hereof);

                           (ii)     any Person (other than a Subsidiary of the 
Company in a transaction that complies with Section 11(o) hereof) shall
consolidate with the Company, or merge with and into the Company and the Company
shall be the continuing or surviving corporation of such consolidation or
merger; or

                           (iii)    the Company shall sell or otherwise transfer
(or one or more of its Subsidiaries shall sell or otherwise transfer), in one or
more transactions, assets or earning power aggregating 50% or more of the assets
or earning power of the Company and its Subsidiaries (taken as a whole) to any
other Person or Persons (other than the Company or one or more of its wholly
owned Subsidiaries in one or more transactions, each of which complies with
Section 11(o) hereof),

                                    then, and in each such case, proper 
provision shall be made so that

                                    (A)     each holder of a Right (except as 
otherwise provided herein) shall thereafter have the right to receive, upon the
exercise thereof in accordance with the terms of this Agreement, such number of
validly authorized and issued, fully paid and nonassessable Common Shares of the
Principal Party (as hereinafter defined), free of any liens, encumbrances,
rights of first refusal or other adverse claims, as shall be equal to the result
obtained by (1) multiplying the then current Purchase Price by the number of
one-thousandths of a Preferred Share for which a Right was exercisable
immediately prior to the first occurrence of a 




                                      -21-
<PAGE>   25

Section 13 Event (or, if a Triggering Event has occurred prior to the first
occurrence of a Section 13 Event, multiplying the number of such one-thousandths
of a Preferred Share for which a Right was exercisable immediately prior to the
first occurrence of a Triggering Event by the Purchase Price in effect
immediately prior to such first occurrence) and (2) dividing that product
(which, following the first occurrence of a Section 13 Event, shall be referred
to as the "TOTAL EXERCISE PRICE" for each Right and for all purposes of this
Agreement) by 50% of the current per share market price (determined pursuant to
Section 11(d) hereof) of the Common Shares of such Principal Party on the date
of consummation of such Section 13 Event;

                                    (B)     such Principal Party shall 
thereafter be liable for, and shall assume, by virtue of such Section 13 Event,
all the obligations and duties of the Company pursuant to this Agreement;

                                    (C)     the term "Company" shall thereafter 
be deemed to refer to such Principal Party, it being specifically intended that
the provisions of Section 11 hereof shall apply only to such Principal Party
following the first occurrence of a Section 13 Event;

                                    (D)     such Principal Party shall take such
steps (including, but not limited to, the reservation of a sufficient number of
its Common Shares) in connection with the consummation of any such transaction
as may be necessary to assure that the provisions hereof shall thereafter be
applicable, as nearly as reasonably may be, in relation to its Common Shares
thereafter deliverable upon the exercise of the Rights.

                  (b) "PRINCIPAL PARTY" shall mean, in the case of any
transaction described in clause (i), (ii) or (iii) of Section 13(a), the Person
referred to therein or such Person's successor, including, if applicable, the
Company, if it is the surviving corporation), provided, however, that in any
such case, (i) if such Person is a direct or indirect Subsidiary of another
Person, "Principal Party" shall refer to such other Person and (ii) in case such
Person is a Subsidiary, directly or indirectly, of more than one Person,
"Principal Party" shall refer to whichever of such Persons is the issuer of the
Common Shares having the greatest aggregate value, and provided, further, that
for purposes of transactions described in clause (iii) hereof, "Principal Party"
shall refer to that Person receiving the greatest portion of the assets or
earning power transferred pursuant to such transaction or transactions.

                  (c) If, for any reason, the Rights cannot be exercised for
Common Shares of such Principal Party as provided in Section 13(a), then each
holder of Rights shall have the right to exchange its Rights for cash from such
Principal Party in an amount equal to the number of Common Shares that it would
otherwise be entitled to purchase times 50% of the current per share market
price, as determined pursuant to Section 11(d) hereof, of such Common Shares of
such Principal Party. If, for any reason, the foregoing formulation cannot be
applied to determine the cash amount into which the Rights are exchangeable,
then the Board of Directors, based upon the advice of one or more nationally
recognized investment banking firms, and based upon the total value of the
Company, shall determine such amount reasonably and with good faith to the
holders of Rights. Any such determination shall be final and binding on the
Rights Agent.




                                      -22-
<PAGE>   26

                  (d) Notwithstanding anything in this Agreement to the
contrary, Section 13 shall not be applicable to a transaction described in
clauses (i) and (ii) of Section 13(a) if: (i) such transaction is consummated
with a Person or Persons who acquired Common Shares pursuant to a Permitted
Offer (or a wholly-owned Subsidiary of any such Person or Persons); (ii) the
price per share of Common Shares offered in such transaction is not less than
the price per share of Common Shares paid to all holders of Common Shares whose
shares were purchased pursuant to such Permitted Offer; and (iii) the form of
consideration being offered to the remaining holders of Common Shares pursuant
to such transaction is the same form as the form of consideration paid pursuant
to such Permitted Offer. Upon consummation of any such transaction contemplated
by this Section 13(d), all Rights hereunder shall expire.

                  (e) The Company shall not consummate any Section 13 Event
unless the Principal Party shall have a sufficient number of authorized Common
Shares that have not been issued or reserved for issuance to permit the exercise
in full of the Rights in accordance with this Section 13 and unless prior
thereto the Company and such issuer shall have executed and delivered to the
Rights Agent a supplemental agreement confirming that such Principal Party
shall, upon consummation of such Section 13 Event, assume this Agreement in
accordance with Sections 13(a) and (b) hereof, that all rights of first refusal
or preemptive rights in respect of the issuance of Common Shares of such
Principal Party upon exercise of outstanding Rights have been waived, that there
are no rights, warrants, instruments or securities outstanding or any agreements
or arrangements which, as a result of the consummation of such transaction,
would eliminate or substantially diminish the benefits intended to be afforded
by the Rights and that such transaction shall not result in a default by such
Principal Party under this Agreement, and further providing that, as soon as
practicable after the date of such Section 13 Event, such Principal Party will:

                           (i)      prepare and file a registration statement 
under the Securities Act with respect to the Rights and the securities
purchasable upon exercise of the Rights on an appropriate form, use its best
efforts to cause such registration statement to become effective as soon as
practicable after such filing and use its best efforts to cause such
registration statement to remain effective (with a prospectus at all times
meeting the requirements of the Securities Act) until the Expiration Date, and
similarly comply with applicable state securities laws;

                           (ii)     use its best efforts to list (or continue 
the listing of) the Rights and the securities purchasable upon exercise of the
Rights on a national securities exchange or to meet the eligibility requirements
for quotation on NASDAQ; and

                           (iii)    deliver to holders of the Rights historical 
financial statements for such Principal Party which comply in all respects with
the requirements for registration on Form 10 (or any successor form) under the
Exchange Act.

                           In the event that at any time after the occurrence 
of a Triggering Event some or all of the Rights shall not have been exercised at
the time of a transaction described in this Section 13, the Rights which have
not theretofore been exercised shall thereafter be exercis-




                                      -23-
<PAGE>   27

able in the manner described in Section 13(a) (without taking into account any
prior adjustment required by Section 11(a)(ii)).

                  (f) The provisions of this Section 13 shall similarly apply to
successive mergers or consolidations or sales or other transfers.

         Section 14.  Fractional Rights and Fractional Shares.

                  (a) The Company shall not be required to issue fractions of
Rights or to distribute Rights Certificates that evidence fractional Rights. In
lieu of such fractional Rights, there shall be paid to the registered holders of
the Rights Certificates with regard to which such fractional Rights would
otherwise be issuable, an amount in cash equal to the same fraction of the
current market value of a whole Right. For the purposes of this Section 14(a),
the current market value of a whole Right shall be the closing price of the
Rights for the Trading Day immediately prior to the date on which such
fractional Rights would have been otherwise issuable, as determined pursuant to
the second sentence of Section 11(d) hereof.

                  (b) The Company shall not be required to issue fractions of
Preferred Shares (other than fractions that are integral multiples of one
one-thousandth of a Preferred Share) upon exercise of the Rights or to
distribute certificates which evidence fractional Preferred Shares (other than
fractions that are integral multiples of one one-thousandth of a Preferred
Share). In lieu of fractional Preferred Shares that are not integral multiples
of one one-thousandth of a Preferred Share, the Company shall pay to the
registered holders of Rights Certificates at the time such Rights are exercised
as herein provided an amount in cash equal to the same fraction of the current
market value of a Common Share. For purposes of this Section 14(b), the current
market value of a Common Share shall be the closing price of a Common Share (as
determined pursuant to the second sentence of Section 11(d) hereof) for the
Trading Day immediately prior to the date of such exercise.

                  (c) The holder of a Right by the acceptance of the Right
expressly waives his or her right to receive any fractional Rights or any
fractional shares upon exercise of a Right.

         Section 15. Rights of Action. All rights of action in respect of this
Agreement, excepting the rights of action given to the Rights Agent under
Section 18 hereof, are vested in the respective registered holders of the Rights
Certificates (and, prior to the Distribution Date, the registered holders of the
Common Shares); and any registered holder of any Rights Certificate (or, prior
to the Distribution Date, of the Common Shares), without the consent of the
Rights Agent or of the holder of any other Rights Certificate (or, prior to the
Distribution Date, of the Common Shares), may, in his or her own behalf and for
his or her own benefit, enforce, and may institute and maintain any suit, action
or proceeding against the Company to enforce, or otherwise act in respect of,
his or her right to exercise the Rights evidenced by such Rights Certificate in
the manner provided in such 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, 




                                      -24-
<PAGE>   28

and injunctive relief against actual or threatened violations of, the
obligations of any Person subject to this Agreement.

         Section 16.  Agreement of Rights Holders.  Every holder of a Right, by 
accepting the same, consents and agrees with the Company and the Rights Agent
and with every other holder of a Right that:

                  (a) prior to the Distribution Date, the Rights will be 
transferable only in connection with the transfer of the Common Shares;

                  (b) after the Distribution Date, the Rights Certificates are
transferable only on the registry books of the Rights Agent if surrendered at
the office or offices of the Rights Agent designated for such purposes, duly
endorsed or accompanied by a proper instrument of transfer and with the
appropriate forms and certificates fully executed;

                  (c) subject to Sections 6(a) and 7(f) hereof, the Company and
the Rights Agent may deem and treat the person in whose name the Rights
Certificate (or, prior to the Distribution Date, the associated Common Shares
certificate) is registered as the absolute owner thereof and of the Rights
evidenced thereby (notwithstanding any notations of ownership or writing on the
Rights Certificates or the associated Common Shares certificate made by anyone
other than the Company or the Rights Agent) for all purposes whatsoever, and
neither the Company nor the Rights Agent shall be affected by any notice to the
contrary; and

                  (d) notwithstanding anything in this Agreement to the
contrary, neither the Company nor the Rights Agent shall have any liability to
any holder of a Right or 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 any governmental authority prohibiting or otherwise restraining
performance of such obligation.

         Section 17. Rights Certificate Holder Not Deemed a Stockholder. No
holder, as such, of any Rights Certificate shall be entitled to vote, receive
dividends or be deemed for any purpose the holder of the Preferred Shares or any
other securities of the Company which may at any time be issuable on the
exercise of the Rights represented thereby, nor shall anything contained herein
or in any Rights Certificate be construed to confer upon the holder of any
Rights Certificate, as such, any of the rights of a stockholder of the Company
or any right to vote for the election of directors or upon any matter submitted
to stockholders at any meeting thereof, or to give or withhold consent to any
corporate action, or to receive notice of meetings or other actions affecting
stockholders (except as provided in Section 25 hereof), or to receive dividends
or subscription rights, or otherwise, until the Right or Rights evidenced by
such Rights Certificate shall have been exercised in accordance with the
provisions hereof.

         Section 18. Concerning the Rights Agent.




                                      -25-
<PAGE>   29

                  (a) The Company agrees to pay to the Rights Agent such
compensation as shall be agreed to in writing between the Company and the Rights
Agent for all services rendered by it hereunder and, from time to time, on
demand of the Rights Agent, its reasonable expenses and counsel fees and
expenses and other disbursements incurred in the administration and execution of
this Agreement and the exercise and performance of its duties hereunder. The
Company also agrees to indemnify the Rights Agent for, and to hold it harmless
against, any loss, liability or expense, incurred without negligence, bad faith
or willful 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 in the premises. The provisions of this Section 18(a) shall
survive the termination of this Agreement.

                  (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
Rights Certificate or certificate for the Common Shares or for other securities
of the Company, 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 and executed by the proper Person or Persons and, where necessary,
verified or acknowledged, or otherwise upon the advice of counsel as set forth
in Section 20 hereof.

         Section 19.  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 with which it may be consolidated, or
any corporation resulting from any merger or consolidation to which the Rights
Agent or any successor Rights Agent shall be a party, or any corporation
succeeding to the shareholder services business of the Rights Agent or any
successor Rights Agent, shall 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, however, that such corporation
would be eligible for appointment as a successor Rights Agent under the
provisions of Section 21 hereof. In case at the time such successor Rights Agent
shall succeed to the agency created by this Agreement, any of the Rights
Certificates shall 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 shall not have 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 shall 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 shall be
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 




                                      -26-
<PAGE>   30

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.

         Section 20. Duties of Rights Agent. The Rights Agent undertakes the
duties and obligations expressly imposed by this Agreement upon the following
terms and conditions, by all of which the Company and the holders of Rights
Certificates, by their acceptance thereof, shall be bound:

                  (a) The Rights Agent may consult with legal counsel of its
selection (who may be legal counsel for the Company), and the opinion or advice
of such counsel shall 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 or advice.

                  (b) Whenever in the performance of its duties under this
Agreement the Rights Agent shall deem it necessary or desirable that any fact or
matter (including, without limitation, the identity of any Acquiring Person and
the determination of "current per share market price") be proved or established
by the Company 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 any one of the Chairman of the Board, the Chief Executive
Officer, the President, any Vice President, the Chief Financial Officer, the
Secretary or any Assistant Secretary of the Company and delivered to the Rights
Agent; and such certificate shall 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 shall be liable hereunder to the Company
and any other Person only for its own negligence, bad faith or willful
misconduct.

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

                  (e) The Rights Agent shall not be under any responsibility in
respect of the validity of this Agreement or the execution and delivery hereof
(except the due execution hereof by the Rights Agent) or in respect of the
validity or execution of any Rights Certificate (except its countersignature
thereof); nor shall it be responsible for any breach by the Company of any
covenant or condition contained in this Agreement or in any Rights Certificate;
nor shall it be responsible for any change in the exercisability of the Rights
or any adjustment in the terms of the Rights (including the manner, method or
amount thereof) provided for in Sections 3, 11, 13, 23 or 24, or the
ascertaining of the existence of facts that would require any such change or
adjustment (except with respect to the exercise of Rights evidenced by Rights
Certificates after receipt by the Rights Agent of a certificate furnished
pursuant to Section 12 describing such change or adjustment); nor shall it by
any act hereunder be deemed to make any representation or warranty as to the
authorization or reservation of any Preferred Shares to be issued pursuant to




                                      -27-
<PAGE>   31

this Agreement or any Rights Certificate or as to whether any Preferred Shares
will, when issued, be validly authorized and issued, fully paid and
nonassessable.

                  (f) The Company 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.

                  (g) The Rights Agent is hereby authorized and directed to
accept instructions with respect to the performance of its duties hereunder from
any one of the Chairman of the Board, the Chief Executive Officer, the
President, any Vice President, the Chief Financial Officer, the Secretary or any
Assistant Secretary of the Company, and to apply to such officers 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 officer or for any delay in acting while waiting for those
instructions. Any application by the Rights Agent for written instructions from
the Company may, at the option of the Rights Agent, set forth in writing any
action proposed to be taken or omitted by the Rights Agent under this Rights
Agreement and the date on and/or after which such action shall be taken or such
omission shall be effective. The Rights Agent shall not be liable for any action
taken by, or omission of, the Rights Agent in accordance with a proposal
included in any such application on or after the date specified in such
application (which date shall not be less than five (5) Business Days after the
date any officer of the Company actually receives such application, unless any
such officer shall have consented in writing to an earlier date) unless, prior
to taking any such action (or the effective date in the case of an omission),
the Rights Agent shall have received written instructions in response to such
application specifying the action to be taken or omitted.

                  (h) The Rights Agent and any stockholder, director, officer or
employee of the Rights Agent may buy, sell or deal in any of the Rights or other
securities of the Company or become pecuniarily interested in any transaction in
which the Company may be interested, or contract with or lend money to the
Company 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 Company or for any other legal entity.

                  (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 shall not be
answerable or accountable for any act, default, neglect or misconduct of any
such attorneys or agents or for any loss to the Company resulting from any such
act, default, neglect or misconduct, provided reasonable care was exercised in
the selection and continued employment thereof.

                  (j) No provision of this Agreement shall require the Rights
Agent to expend or risk its own funds or otherwise incur any financial liability
in the performance of any of its duties hereunder or in the exercise of its
rights if there shall be reasonable grounds for believing that repayment of such
funds or adequate indemnification against such risk or liability is not
reasonably assured to it.




                                      -28-
<PAGE>   32

                  (k) If, with respect to any Rights Certificate surrendered to
the Rights Agent for exercise or transfer, the certificate attached to the form
of assignment or form of election to purchase, as the case may be, has either
not been completed or indicates an affirmative response to clause 1 and/or 2
thereof, the Rights Agent shall not take any further action with respect to such
requested exercise or transfer without first consulting with the Company.

         Section 21. Change of Rights Agent. The Rights Agent or any successor
Rights Agent may resign and be discharged from its duties under this Agreement
upon thirty (30) days' notice in writing mailed to the Company and to each
transfer agent of the Preferred Shares and the Common Shares by registered or
certified mail. The Company may remove the Rights Agent or any successor Rights
Agent upon thirty (30) days' notice in writing, mailed to the Rights Agent or
successor Rights Agent, as the case may be, and to each transfer agent of the
Preferred Shares and the Common Shares by registered or certified mail. If the
Rights Agent shall resign or be removed or shall otherwise become incapable of
acting, the Company shall appoint a successor to the Rights Agent. If the
Company shall fail to make such appointment within a period of thirty (30) days
after giving notice of 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 a Rights Certificate (who shall, with such notice, submit his
or her Rights Certificate for inspection by the Company), then the Rights Agent
or the registered holder of any Rights Certificate may apply to any court of
competent jurisdiction for the appointment of a new Rights Agent. Any successor
Rights Agent, whether appointed by the Company or by such a court, shall be a
corporation organized and doing business under the laws of the United States or
of any state of the United States, in good standing, which is authorized under
such laws to exercise corporate trust or stockholder services powers and is
subject to supervision or examination by federal or state authority and which
has at the time of its appointment as Rights Agent a combined capital and
surplus of at least $50 million. After appointment, the successor Rights Agent
shall 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 any property at the time held by it hereunder, and execute and deliver any
further assurance, conveyance, act or deed necessary for the purpose. Not later
than the effective date of any such appointment, the Company shall file notice
thereof in writing with the predecessor Rights Agent and each transfer agent of
the Preferred Shares and the Common Shares, and mail a notice thereof in writing
to the registered holders of the Rights Certificates. Failure to give any notice
provided for in this Section 21, 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.

         Section 22. Issuance of New Rights Certificates. Notwithstanding any of
the provisions of this Agreement or of the Rights to the contrary, the Company
may, at its option, issue new Rights Certificates evidencing Rights in such form
as may be approved by its Board of Directors to reflect any adjustment or change
in the Purchase Price and the number or kind or class of shares or other
securities or property purchasable under the Rights Certificates made in
accordance with the provisions of this Agreement. In addition, in connection
with the issuance or sale of Common Shares following the Distribution Date and
prior to the redemption or expiration of the Rights, the Company (a) shall, with
respect to Common Shares so issued or sold 




                                      -29-
<PAGE>   33

pursuant to the exercise of stock options or under any employee plan or
arrangement or upon the exercise, conversion or exchange of the convertible
subordinated debentures of the Company outstanding at the date hereof or upon
the exercise, conversion or exchange of securities hereinafter issued by the
Company and (b) may, in any other case, if deemed necessary or appropriate by
the Board of Directors of the Company, issue Rights Certificates representing
the appropriate number of Rights in connection with such issuance or sale;
provided, however, that (i) no such Rights Certificate shall be issued and this
sentence shall be null and void ab initio if, and to the extent that, such
issuance or this sentence would create a significant risk of or result in
material adverse tax consequences to the Company or the Person to whom such
Rights Certificate would be issued or would create a significant risk of or
result in such options' or employee plans' or arrangements' failing to qualify
for otherwise available special tax treatment and (ii) no such Rights
Certificate shall be issued if, and to the extent that, appropriate adjustment
shall otherwise have been made in lieu of the issuance thereof.

         Section 23.  Redemption.

                  (a) The Company may, at its option and with the approval of
the Board of Directors, at any time prior to the Close of Business on the
earlier of (i) the tenth day following the Shares Acquisition Date or such later
date as may be determined by action of a majority of Continuing Directors then
in office and publicly announced by the Company or (ii) the Final Expiration
Date, redeem all but not less than all the then outstanding Rights at a
redemption price of $0.01 per Right, appropriately adjusted to reflect any stock
split, stock dividend or similar transaction occurring after the date hereof
(such redemption price being herein referred to as the "Redemption Price") and
the Company may, at its option, pay the Redemption Price either in Common Shares
(based on the current per share market price thereof (as determined pursuant to
Section 11(d) hereof) at the time of redemption) or cash; provided, however, if
the Board of Directors of the Company authorizes redemption of the Rights on or
after the time a Person becomes an Acquiring Person, then there must be
Continuing Directors then in office and such authorization shall require the
concurrence of a majority of such Continuing Directors.

                  (b) Immediately upon the action of the Board of Directors of
the Company ordering the redemption of the Rights, evidence of which shall have
been filed with the Rights Agent, and without any further action and without any
notice, the right to exercise the Rights will terminate and the only right
thereafter of the holders of Rights shall be to receive the Redemption Price.
Within ten (10) days after the action of the Board of Directors ordering the
redemption of the Rights, the Company shall give notice of such redemption to
the Rights Agent and the holders of the then outstanding Rights by mailing such
notice to all such holders at their last addresses as they appear upon the
registry books of the Rights Agent or, prior to the Distribution Date, on the
registry books of the transfer agent for the Common Shares. Any notice which is
mailed in the manner herein provided shall be deemed given, whether or not the
holder receives the notice. Each such notice of redemption will state the method
by which the payment of the Redemption Price will be made. Neither the Company
nor any of its Affiliates or Associates may redeem, acquire or purchase for
value any Rights at any time in any manner other than that specifically set
forth in this Section 23 or in Section 24 hereof, and other than in connection
with the purchase of Common Shares prior to the Distribution Date.




                                      -30-
<PAGE>   34

         Section 24.  Exchange.

                  (a) Subject to applicable laws, rules and regulations, and
subject to subsection (c) below, the Company may, at its option, by majority
vote of the Board of Directors and a majority vote of the Continuing Directors,
at any time after the occurrence of a Triggering Event, exchange all or part of
the then outstanding and exercisable Rights (which shall not include Rights that
have become void pursuant to the provisions of Section 7(e) hereof) for Common
Shares at an exchange ratio of one Common Share per Right, appropriately
adjusted to reflect any stock split, stock dividend or similar transaction
occurring after the date hereof (such exchange ratio being hereinafter referred
to as the "RATIO OF EXCHANGE"). Notwithstanding the foregoing, the Board of
Directors shall not be empowered to effect such exchange at any time after any
Person (other than the Company, any Subsidiary of the Company, any employee
benefit plan of the Company or any such Subsidiary, or any entity holding Common
Shares for or pursuant to the terms of any such plan), together with all
Affiliates and Associates of such Person, becomes the Beneficial Owner of 50% or
more of the Common Shares then outstanding.

                  (b) Immediately upon the action of the Board of Directors
ordering the exchange of any Rights pursuant to subsection (a) of this Section
24 and without any further action and without any notice, the right to exercise
such Rights shall terminate and the only right thereafter of a holder of such
Rights shall be to receive that number of Common Shares equal to the number of
such Rights held by such holder multiplied by the Ratio of Exchange. The Company
shall give public notice of any such exchange; provided, however, that the
failure to give, or any defect in, such notice shall not affect the validity of
such exchange. The Company shall mail a notice of any such exchange to all of
the holders of such Rights at their last addresses as they appear upon the
registry books of the Rights Agent. Any notice which is mailed in the manner
herein provided shall be deemed given, whether or not the holder receives the
notice. Each such notice of exchange will state the method by which the exchange
of the Common Shares for Rights will be effected and, in the event of any
partial exchange, the number of Rights which will be exchanged. Any partial
exchange shall be effected pro rata based on the number of Rights (other than
Rights which have become void pursuant to the provisions of Section 7(e) hereof)
held by each holder of Rights.

                  (c) In the event that there shall not be sufficient Common
Shares issued but not outstanding or authorized but unissued to permit any
exchange of Rights as contemplated in accordance with Section 24(a), the Company
shall either take such action as may be necessary to authorize additional Common
Shares for issuance upon exchange of the Rights or alternatively, at the option
of a majority of the Board of Directors, with respect to each Right (i) pay cash
in an amount equal to the Current Value (as hereinafter defined), in lieu of
issuing Common Shares in exchange therefor, or (ii) issue debt or equity
securities or a combination thereof, having a value equal to the Current Value,
in lieu of issuing common Shares in exchange for each such Right, where the
value of such securities shall be determined by a nationally recognized
investment banking firm selected by the Board of Directors by majority vote of
the Board of Directors, or (iii) deliver any combination of cash, property,
Common Shares and/or other securities having a value equal to the Current Value
in exchange for each Right. For purposes of this Section 24(c) only, the Current
Value shall mean the product of the current per share market price of Common




                                      -31-
<PAGE>   35

Shares (determined pursuant to Section 11(d) on the date of the occurrence of
the event described above in subparagraph (a)) multiplied by the number of
Common Shares for which the Right otherwise would be exchangeable if there were
sufficient shares available. To the extent that the Company determines that some
action need be taken pursuant to clauses (i), (ii) or (iii) of this Section
24(c), the Board of Directors may temporarily suspend the exercisability of the
Rights for a period of up to sixty (60) days following the date on which the
event described in Section 24(a) shall have occurred, in order to seek any
authorization of additional Common Shares and/or to decide the appropriate form
of distribution to be made pursuant to the above provision and to determine the
value thereof. In the event of any such suspension, the Company shall issue a
public announcement, and shall send a written notice to the Rights Agent,
stating that the exercisability of the Rights has been temporarily suspended.

                  (d) The Company shall not be required to issue fractions of
Common Shares or to distribute certificates that evidence fractional Common
Shares. In lieu of such fractional Common Shares, there shall be paid to the
registered holders of the Rights Certificates with regard to which such
fractional Common Shares would otherwise be issuable, an amount in cash equal to
the same fraction of the current per share market value of a whole Common Share
(as determined pursuant to the second sentence of Section 11(d) hereof).

                  (e) The Company may, at its option, by majority vote of the
Board of Directors, at any time before any Person has become an Acquiring
Person, exchange all or part of the then outstanding Rights for rights of
substantially equivalent value, as determined reasonably and with good faith by
the Board of Directors, based upon the advice of one or more nationally
recognized investment banking firms.

                  (f) Immediately upon the action of the Board of Directors
ordering the exchange of any Rights pursuant to subsection (e) of this Section
24 and without any further action and without any notice, the right to exercise
such Rights shall terminate and the only right thereafter of a holder of such
Rights shall be to receive that number of rights in exchange therefor as has
been determined by the Board of Directors in accordance with subsection (e)
above. The Company shall give public notice, and written notice to the Rights
Agent, of any such exchange; provided, however, that the failure to give, or any
defect in, such notice shall not affect the validity of such exchange. The
Company shall mail a notice of any such exchange to all of the holders of such
Rights at their last addresses as they appear upon the registry books of the
transfer agent for the Common Shares of the Company. Any notice which is mailed
in the manner herein provided shall be deemed given, whether or not the holder
receives the notice. Each such notice of exchange will state the method by which
the exchange of the Rights will be effected.

         Section 25.  Notice of Certain Events.

                  (a) In case the Company shall propose to effect or permit to
occur any Section 13 Event, the Company shall give notice thereof to each holder
of Rights, and to the Rights Agent, in accordance with Section 26 hereof at
least twenty (20) days prior to occurrence of such Section 13 Event.




                                      -32-
<PAGE>   36

                  (b) In case any Triggering Event or Section 13 Event shall
occur, then, in any such case, the Company shall as soon as practicable
thereafter give to each holder of a Rights Certificate, and to the Rights Agent,
in accordance with Section 26 hereof, a notice of the occurrence of such event,
which shall specify the event and the consequences of the event to holders of
Rights under Sections 11(a)(ii) and 13 hereof.

         Section 26. Notices. Notices or demands authorized by this Agreement to
be given or made by the Rights Agent or by the holder of any Rights Certificate
to or on the Company shall be sufficiently given or made if sent by first-class
mail, postage prepaid, addressed (until another address is filed in writing with
the Rights Agent) as follows:

                              Connetics Corporation
                             3400 West Bayshore Road
                               Palo Alto, CA 94303
                              Attention: President

Subject to the provisions of Section 21 hereof, any notice or demand authorized
by this Agreement to be given or made by the Company or by the holder of any
Rights Certificate to or on the Rights Agent shall be sufficiently given or made
if sent by first-class mail, postage prepaid addressed (until another address is
filed in writing with the Company) as follows:

                       The U.S. Stock Transfer Corporation
                               1745 Gardena Avenue
                               Glendale, CA 91204
                              Attention: President

Notices or demands authorized by this Agreement to be given or made by the
Company or the Rights Agent to or on the holder of any Rights Certificate shall
be sufficiently given or made if sent by first-class mail, postage prepaid,
addressed to such holder at the address of such holder as shown on the registry
books of the Company.

         Section 27. Supplements and Amendments. Prior to the Distribution Date,
the Company may supplement or amend this Agreement in any respect without the
approval of any holders of Rights and the Rights Agent shall, if the Company so
directs, execute such supplement or amendment. From and after the Distribution
Date, the Company and the Rights Agent may from time to time supplement or amend
this Agreement without the approval of any holders of Rights in order to (i)
cure any ambiguity, (ii) correct or supplement any provision contained herein
which may be defective or inconsistent with any other provisions herein, (iii)
shorten or lengthen any time period hereunder (which lengthening or shortening,
following the first occurrence of an event set forth in clauses (i) and (ii) of
the proviso to Section 23(a) hereof, shall be effective only if there are
Continuing Directors and shall require the concurrence of a majority of such
Continuing Directors) or (iv) to change or supplement the provisions hereunder
in any manner that the Company may deem necessary or desirable and that shall
not adversely affect the interests of the holders of Rights (other than an
Acquiring Person or an Affiliate or Associate of an Acquiring Person); provided,
this Agreement may not be supplemented or amended to 




                                      -33-
<PAGE>   37

lengthen, pursuant to clause (iii) of this sentence, (A) a time period relating
to when the Rights may be redeemed at such time as the Rights are not then
redeemable or (B) any other time period unless such lengthening is for the
purpose of protecting, enhancing or clarifying the rights of, and/or the
benefits to, the holders of Rights. Upon the delivery of a certificate from an
appropriate officer of the Company that states that the proposed supplement or
amendment is in compliance with the terms of this Section 27, the Rights Agent
shall execute such supplement or amendment. Prior to the Distribution Date, the
interests of the holders of Rights shall be deemed coincident with the interests
of the holders of Common Shares. Notwithstanding any other provision hereof, the
Rights Agent's consent must be obtained regarding any amendment or supplement
pursuant to this Section 27 which alters the Rights Agent's rights or duties,
which consent shall not be unreasonably withheld.

         Section 28. Successors.  All the covenants and provisions of this 
Agreement by or for the benefit of the Company or the Rights Agent shall bind
and inure to the benefit of their respective successors and assigns hereunder.

         Section 29. Determinations and Actions by the Board of Directors, etc.
For all purposes of this Agreement, any calculation of the number of Common
Shares outstanding at any particular time, including for purposes of determining
the particular percentage of such outstanding Common Shares of which any Person
is the Beneficial Owner, shall be made in accordance with the last sentence of
Rule 13d-3(d)(1)(i) of the General Rules and Regulations under the Exchange Act.
The Board of Directors of the Company (and, where specifically provided for
herein, the Continuing Directors) shall have the exclusive power and authority
to administer this Agreement and to exercise all rights and powers specifically
granted to the Board, or the Company (or, where specifically provided for
herein, the Continuing Directors), 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 redeem the Rights or to
amend the Agreement). All such actions, calculations, interpretations and
determinations (including, for purposes of clause (y) below, all omissions with
respect to the foregoing) which are done or made by the Board (or, where
specifically provided for herein, by the Continuing Directors) in good faith,
shall (x) be final, conclusive and binding on the Company, the Rights Agent, the
holders of the Rights Certificates and all other parties and (y) not subject the
Board or the Continuing Directors to any liability to the holders of the Rights.

         Section 30.  Benefits of this Agreement.

            Nothing in this Agreement shall be construed to give to any Person
other than the Company, the Rights Agent and the registered holders of the
Rights Certificates (and, prior to the Distribution Date, the Common Shares) any
legal or equitable right, remedy or claim under this Agreement; but this
Agreement shall be for the sole and exclusive benefit of the Company, the Rights
Agent and the registered holders of the Rights Certificates (and, prior to the
Distribution Date, the Common Shares).




                                      -34-
<PAGE>   38

         Section 31. Severability. If any term, provision, covenant or
restriction of this Agreement is held by a court of competent jurisdiction or
other authority to be invalid, void or unenforceable, the remainder of the
terms, provisions, covenants and restrictions of this Agreement shall remain in
full force and effect and shall in no way be affected, impaired or invalidated;
provided, however, that notwithstanding anything in this Agreement to the
contrary, if any such term, provision, covenant or restriction is held by such
court or authority to be invalid, void or unenforceable and the Board of
Directors of the Company determines in its good faith judgment that severing the
invalid language from this Agreement would adversely affect the purpose or
effect of this Agreement, the right of redemption set forth in Section 23 hereof
shall be reinstated and shall not expire until the close of business on the
tenth day following the date of such determination by the Board of Directors.

         Section 32. Governing Law. This Agreement and each Right and each
Rights Certificate issued hereunder shall be deemed to be a contract made under
the laws of the State of Delaware and for all purposes shall be governed by and
construed in accordance with the laws of such State applicable to contracts to
be made and performed entirely within such State.

         Section 33. 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.

         Section 34. Descriptive Headings.  Descriptive headings of the several 
Sections of this Agreement are inserted for convenience only and shall not
control or affect the meaning or construction of any of the provisions hereof.



         [Signature Page Follows]



                                      -35-
<PAGE>   39


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



                                   CONNETICS CORPORATION


                                   By: /s/ Thomas G. Wiggans
                                       ----------------------------------------

                                   Name: Thomas G. Wiggans
                                         --------------------------------------

                                   Title: President and Chief Executive Officer
                                          -------------------------------------


                                   THE U.S. STOCK TRANSFER 
                                   CORPORATION, AS RIGHTS AGENT


                                   By: /s/ U.S. Stock Transfer Corporation
                                       ----------------------------------------

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

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




                                      -36-
<PAGE>   40


                                    EXHIBIT A

                CERTIFICATE OF DESIGNATION OF RIGHTS, PREFERENCES

                                AND PRIVILEGES OF

                     SERIES B PARTICIPATING PREFERRED STOCK

                                       OF

                              CONNETICS CORPORATION



<PAGE>   41



                CERTIFICATE OF DESIGNATION OF RIGHTS, PREFERENCES


                                AND PRIVILEGES OF

                     SERIES B PARTICIPATING PREFERRED STOCK

                                       OF

                              CONNETICS CORPORATION


         Pursuant to Section 151 and Section 103 of the General Corporation Law
of the State of Delaware, we, Thomas G. Wiggans and Joshua L. Green, the
President and the Secretary, respectively, of Connetics Corporation, a
corporation organized and existing under the General Corporation Law of the
State of Delaware DO HEREBY CERTIFY:

         That pursuant to the authority conferred upon the Board of Directors by
the Amended and Restated Certificate of Incorporation of the said Corporation,
the said Board of Directors, on April 29, 1997, and effective as of April 29,
1997, adopted the following resolution creating a series of shares of Preferred
Stock designated as Series B Participating Preferred Stock:

         "RESOLVED, that pursuant to the authority vested in the Board of
Directors of the corporation by the Amended and Restated Certificate of
Incorporation, the Board of Directors does hereby provide for the issue of a
series of Preferred Shares, $0.001 par value, of the Corporation, to be
designated "SERIES B PARTICIPATING PREFERRED STOCK", initially consisting of
Ninety Thousand (90,000) shares and to the extent that the designations, powers,
preferences and relative and other special rights and the qualifications,
limitations and restrictions of the Series B Participating Preferred Stock are
not stated and expressed in the Amended and Restated Certificate of
Incorporation, does hereby fix and herein state and express such designations,
powers, preferences and relative and other special rights and the
qualifications, limitations and restrictions thereof, as follows (all terms used
herein which are defined in the Amended and Restated Certificate of
Incorporation shall be deemed to have the meanings provided therein):

         Section 1. Designation and Amount. The shares of such series shall be
designated as "Series B Participating Preferred Stock", par value $0.001 per
share, and the number of shares constituting such series shall be Ninety
Thousand (90,000).

         Section 2. Dividends and Distributions.

                  (A) Subject to the prior and superior right of the holders of
any shares of any series of Preferred Stock ranking prior and superior to the
shares of Series B Participating Preferred Stock with respect to dividends, the
holders of shares of Series B Participating Preferred Stock shall be entitled to
receive when, as and if declared by the Board of Directors out of funds legally
available for the purpose, quarterly dividends payable in cash on the last day
of December, March, June and September in each year (each such date being
referred to herein as a "QUARTERLY DIVIDEND PAYMENT DATE"), commencing on the
first Quarterly Dividend Payment 




<PAGE>   42

Date after the first issuance of a share or fraction of a share of Series B
Participating Preferred Stock, in an amount per share (rounded to the nearest
cent) equal to, subject to the provision for adjustment hereinafter set forth,
1,000 times the aggregate per share amount of all cash dividends, and 1,000
times the aggregate per share amount (payable in kind) of all non-cash dividends
or other distributions other than a dividend payable in shares of Common Stock
or a subdivision of the outstanding shares of Common Stock (by reclassification
or otherwise), declared on the Common Stock of the Corporation (the "COMMON
STOCK") since the immediately preceding Quarterly Dividend Payment Date, or,
with respect to the first Quarterly Dividend Payment Date, since the first
issuance of any share or fraction of a share of Series B Participating Preferred
Stock. In the event the Corporation shall at any time after April 29, 1997 (the
"RIGHTS DECLARATION DATE") (i) declare any dividend on Common Stock payable in
shares of Common Stock, (ii) subdivide the outstanding Common Stock, or (iii)
combine the outstanding Common Stock into a smaller number of shares, then in
each such case the amount to which holders of shares of Series B Participating
Preferred Stock were entitled immediately prior to such event under the
preceding sentence shall be adjusted by multiplying such amount by a fraction,
the numerator of which is the number of shares of Common Stock outstanding
immediately after such event and the denominator of which is the number of
shares of Common Stock that were outstanding immediately prior to such event.

                  (B) The Corporation shall declare a dividend or distribution
on the Series B Participating Preferred Stock as provided in paragraph (A) above
immediately after it declares a dividend or distribution on the Common Stock
(other than a dividend payable in shares of Common Stock).

                  (C) Dividends shall begin to accrue and be cumulative on
outstanding shares of Series B Participating Preferred Stock from the Quarterly
Dividend Payment Date next preceding the date of issue of such shares of Series
B Participating Preferred Stock, unless the date of issue of such shares is
prior to the record date for the first Quarterly Dividend Payment Date, in which
case dividends on such shares shall begin to accrue from the date of issue of
such shares, or unless the date of issue is a Quarterly Dividend Payment Date or
is a date after the record date for the determination of holders of shares of
Series B Participating Preferred Stock entitled to receive a quarterly dividend
and before such Quarterly Dividend Payment Date, in either of which events such
dividends shall begin to accrue and be cumulative from such Quarterly Dividend
Payment Date. Accrued but unpaid dividends shall not bear interest. Dividends
paid on the shares of Series B Participating Preferred Stock in an amount less
than the total amount of such dividends at the time accrued and payable on such
shares shall be allocated pro rata on a share-by-share basis among all such
shares at the time outstanding. The Board of Directors may fix a record date for
the determination of holders of shares of Series B Participating Preferred Stock
entitled to receive payment of a dividend or distribution declared thereon,
which record date shall be no more than 30 days prior to the date fixed for the
payment thereof.

         Section 3.  Voting Rights.  The holders of shares of Series B 
Participating Preferred Stock shall have the following voting rights:




                                       -2-
<PAGE>   43

                  (A) Subject to the provision for adjustment hereinafter set
forth, each share of Series B Participating Preferred Stock shall entitle the
holder thereof to 1,000 votes on all matters submitted to a vote of the
stockholders of the Corporation. In the event the Corporation shall at any time
after the Rights Declaration Date (i) declare any dividend on Common Stock
payable in shares of Common Stock, (ii) subdivide the outstanding Common Stock,
or (iii) combine the outstanding Common Stock into a smaller number of shares,
then in each such case the number of votes per share to which holders of shares
of Series B Participating Preferred Stock were entitled immediately prior to
such event shall be adjusted by multiplying such number by a fraction, the
numerator of which is the number of shares of Common Stock outstanding
immediately after such event and the denominator of which is the number of
shares of Common Stock that were outstanding immediately prior to such event.

                  (B) Except as otherwise provided herein or by law, the holders
of shares of Series B Participating Preferred Stock and the holders of shares of
Common Stock shall vote together as one class on all matters submitted to a vote
of stockholders of the Corporation.

                  (C) Except as required by law, holders of Series B
Participating Preferred Stock shall have no special voting rights and their
consent shall not be required (except to the extent they are entitled to vote
with holders of Common Stock as set forth herein) for taking any corporate
action.

         Section 4.  Certain Restrictions.

                  (A) The Corporation shall not declare any dividend on, make
any distribution on, or redeem or purchase or otherwise acquire for
consideration any shares of Common Stock after the first issuance of a share or
fraction of a share of Series B Participating Preferred Stock unless
concurrently therewith it shall declare a dividend on the Series B Participating
Preferred Stock as required by Section 2 hereof.

                  (B) Whenever quarterly dividends or other dividends or
distributions payable on the Series B Participating Preferred Stock as provided
in Section 2 are in arrears, thereafter and until all accrued and unpaid
dividends and distributions, whether or not declared, on shares of Series B
Participating Preferred Stock outstanding shall have been paid in full, the
Corporation shall not:

                           (i)      declare or pay dividends on, make any other 
distributions on, or redeem or purchase or otherwise acquire for consideration
any shares of stock ranking junior (either as to dividends or upon liquidation,
dissolution or winding up) to the Series B Participating Preferred Stock;

                           (ii)     declare or pay dividends on, make any other 
distributions on any shares of stock ranking on a parity (either as to dividends
or upon liquidation, dissolution or winding up) with Series B Participating
Preferred Stock, except dividends paid ratably on the Series B Participating
Preferred Stock and all such parity stock on which dividends are payable or in
arrears in proportion to the total amounts to which the holders of all such
shares are then entitled;




                                      -3-
<PAGE>   44

                           (iii)    redeem or purchase or otherwise acquire for 
consideration shares of any stock ranking on a parity (either as to dividends or
upon liquidation, dissolution or winding up) with the Series B Participating
Preferred Stock, provided that the Corporation may at any time redeem, purchase
or otherwise acquire shares of any such parity stock in exchange for shares of
any stock of the Corporation ranking junior (either as to dividends or upon
dissolution, liquidation or winding up) to the Series B Participating Preferred
Stock;

                           (iv)     purchase or otherwise acquire for 
consideration any shares of Series B Participating Preferred Stock, or any
shares of stock ranking on a parity with the Series B Participating Preferred
Stock, except in accordance with a purchase offer made in writing or by
publication (as determined by the Board of Directors) to all holders of such
shares upon such terms as the Board of Directors, after consideration of the
respective annual dividend rates and other relative rights and preferences of
the respective series and classes, shall determine in good faith will result in
fair and equitable treatment among the respective series or classes.

                  (C) The Corporation shall not permit any subsidiary of the
Corporation to purchase or otherwise acquire for consideration any shares of
stock of the Corporation unless the Corporation could, under paragraph (A) of
this Section 4, purchase or otherwise acquire such shares at such time and in
such manner.

         Section 5. Reacquired Shares. Any shares of Series B Participating
Preferred Stock purchased or otherwise acquired by the Corporation in any manner
whatsoever shall be retired and canceled promptly after the acquisition thereof.
All such shares shall upon their cancellation become authorized but unissued
shares of Preferred Stock and may be reissued as part of a new series of
Preferred Stock to be created by resolution or resolutions of the Board of
Directors, subject to the conditions and restrictions on issuance set forth
herein.

         Section 6. Liquidation, Dissolution or Winding Up.

                  (A) Upon any liquidation (voluntary or otherwise), dissolution
or winding up of the Corporation, no distribution shall be made to the holders
of shares of stock ranking junior (either as to dividends or upon liquidation,
dissolution or winding up) to the Series B Participating Preferred Stock unless,
prior thereto, the holders of shares of Series B Participating Preferred Stock
shall have received an amount equal to accrued and unpaid dividends and
distributions thereon, whether or not declared, to the date of such payment,
plus an amount equal to the greater of (1) $1,000 per share, provided that in
the event the Corporation does not have sufficient assets, after payment of its
liabilities and distribution to holders of Preferred Stock ranking prior to the
Series B Participating Preferred Stock, available to permit payment in full of
the $1,000 per share amount, the amount required to be paid under this Section
6(A)(1) shall, subject to Section 6(B) hereof, equal the value of the amount of
available assets divided by the number of outstanding shares of Series B
Participating Preferred Stock or (2) subject to the provisions for adjustment
hereinafter set forth, 1,000 times the aggregate per share amount to be
distributed to the holders of Common Stock (the greater of (1) or (2), the
"Series B Liquidation Preference"). In the event the Corporation shall at any
time after the Rights Declaration Date (i) declare any dividend on Common Stock
payable in shares of Common Stock, (ii) subdivide 




                                      -4-
<PAGE>   45

the outstanding Common Stock, or (iii) combine the outstanding Common Stock into
a smaller number of shares, then in each such case the amount to which holders
of shares of Series B Participating Preferred Stock were entitled immediately
prior to such event under clause (2) of the preceding sentence shall be adjusted
by multiplying such amount by a fraction the numerator of which is the number of
shares of Common Stock that were outstanding immediately after such event and
the denominator of which is the number of shares of Common Stock that were
outstanding immediately prior to such event.

                  (B) In the event, however, that there are not sufficient
assets available to permit payment in full of the Series B Liquidation
Preference and the liquidation preferences of all other series of Preferred
Stock, if any, which rank on a parity with the Series B Participating Preferred
Stock, then such remaining assets shall be distributed ratably to the holders of
such parity shares in proportion to their respective liquidation preferences.

         Section 7. Consolidation, Merger, etc. In case the Corporation shall
enter into any consolidation, merger, combination or other transaction in which
the shares of Common Stock are exchanged for or changed into other stock or
securities, cash and/or any other property, then in any such case the shares of
Series B Participating Preferred Stock shall at the same time be similarly
exchanged or changed in an amount per share (subject to the provision for
adjustment hereinafter set forth) equal to 1,000 times the aggregate amount of
stock, securities, cash and/or any other property (payable in kind), as the case
may be, into which or for which each share of Common Stock is changed or
exchanged. In the event the Corporation shall at any time after the Rights
Declaration Date (i) declare any dividend on Common Stock payable in shares of
Common Stock, (ii) subdivide the outstanding Common Stock, or (iii) combine the
outstanding Common Stock into a smaller number of shares, then in each such case
the amount set forth in the preceding sentence with respect to the exchange or
change of shares of Series B Participating Preferred Stock shall be adjusted by
multiplying such amount by a fraction the numerator of which is the number of
shares of Common Stock outstanding immediately after such event and the
denominator of which is the number of shares of common Stock that were
outstanding immediately prior to such event.

         Section 8. No Redemption.  The shares of Series B Participating 
Preferred Stock shall not be redeemable.

         Section 9. Ranking. The Series B Participating Preferred Stock shall
rank junior to all other series of the Corporation's Preferred Stock as to the
payment of dividends and the distribution of assets, unless the terms of any
such series shall provide otherwise.

         Section 10. Amendment. The Certificate of Incorporation of the
Corporation shall not be further amended in any manner which would materially
alter or change the powers, preference or special rights of the Series B
Participating Preferred Stock so as to affect them adversely without the
affirmative vote of the holders of a majority or more of the outstanding shares
of Series B Participating Preferred Stock, voting separately as a class.

         Section 11. Fractional Shares. Series B Participating Preferred Stock
may be issued in fractions of a share which shall entitle the holder, in
proportion to such holder's fractional shares, 




                                      -5-
<PAGE>   46

to exercise voting rights, receive dividends, participate in distributions and
to have the benefit of all other rights of holders of Series B Participating
Preferred Stock."

         IN WITNESS WHEREOF, we have executed and subscribed this Certificate
and do affirm the foregoing as true under the penalties of perjury this ___ day
of May, 1997.




                                        -------------------------------------
                                        Thomas G. Wiggans
                                        President and Chief Executive Officer



ATTEST:




- --------------------------------
Joshua L. Green
Secretary




                                      -6-
<PAGE>   47

                                    EXHIBIT B

                           FORM OF RIGHTS CERTIFICATE

Certificate No. R-                                                ______ Rights

         NOT EXERCISABLE AFTER APRIL 29, 2007, OR EARLIER IF TERMINATED BY THE
         COMPANY. THE RIGHTS ARE SUBJECT TO REDEMPTION, AT THE OPTION OF THE
         COMPANY, AT $.01 PER RIGHT ON THE TERMS SET FORTH IN THE RIGHTS
         AGREEMENT. UNDER CERTAIN CIRCUMSTANCES, RIGHTS BENEFICIALLY OWNED BY AN
         ACQUIRING PERSON OR AN AFFILIATE OR ASSOCIATE OF AN ACQUIRING PERSON
         (AS SUCH TERMS ARE DEFINED IN THE RIGHTS AGREEMENT) AND ANY SUBSEQUENT
         HOLDER OF SUCH RIGHTS MAY BECOME NULL AND VOID. [THE RIGHTS REPRESENTED
         BY THIS RIGHTS CERTIFICATE ARE OR WERE BENEFICIALLY OWNED BY A PERSON
         WHO WAS OR BECAME AN ACQUIRING PERSON OR AN AFFILIATE OR ASSOCIATE OF
         AN ACQUIRING PERSON (AS SUCH TERMS ARE DEFINED IN THE RIGHTS
         AGREEMENT). ACCORDINGLY, THIS RIGHTS CERTIFICATE AND THE RIGHTS
         REPRESENTED HEREBY MAY BECOME NULL AND VOID IN THE CIRCUMSTANCES
         SPECIFIED IN SECTION 7(e) OF SUCH RIGHTS AGREEMENT.]*

                               RIGHTS CERTIFICATE

         This certifies that ________________________, or registered assigns, is
the registered owner of the number of Rights set forth above, each of which
entitles the owner thereof, subject to the terms, provisions and conditions of
the Preferred Shares Rights Agreement, dated as of May 20, 1997 (the "RIGHTS
AGREEMENT"), between Connetics Corporation, a Delaware corporation (the
"COMPANY"), and the U.S. Stock Transfer Corporation (the "RIGHTS AGENT"), to
purchase from the Company at any time after the Distribution Date (as such term
is defined in the Rights Agreement) and prior to 5:00 P.M., New York, New York
time, on April 29, 2007, at the office of the Rights Agent designated for such
purpose, or at the office of its successor as Rights Agent, one one-thousandth
(1/1,000) of a fully paid non-assessable share of Series B Participating
Preferred Stock (the "PREFERRED Shares"), of the Company, at a purchase price of
$49 per one-thousandth of a Preferred Share (the "PURCHASE Price"), upon
presentation and surrender of this Rights Certificate with the Form of Election
to Purchase and related Certificate duly executed. The number of Rights
evidenced by this Rights Certificate (and the number of one-thousandths of a
Preferred Share which may be purchased upon exercise hereof) set forth above,
are the number and Purchase Price as of ________, 1997, based on the Preferred
Shares as constituted at such date. As provided in the Rights Agreement, the
Purchase Price and the number and kind of Preferred Shares or other securities
which may be purchased upon the exercise of the Rights evidenced by this Rights
Certificate are subject to modification and adjustment upon the happening of
certain events.


- --------
* The portion of the legend in bracket shall be inserted only if applicable and
shall replace the preceding sentence.


<PAGE>   48

         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 hereunder of the
Rights Agent, the Company and the holders of the Rights Certificates, which
limitations of rights include the temporary suspension of the exercisability of
such Rights under the specific circumstances set forth in the Rights Agreement.
Copies of the Rights Agreement are on file at the principal executive offices of
the Company and the above-mentioned office of the Rights Agent.

         Subject to the provisions of the Rights Agreement, the Rights evidenced
by this Rights Certificate (i) may be redeemed by the Company, at its option, at
a redemption price of $.01 per Right or (ii) may be exchanged by the Company in
whole or in part for Common Shares, substantially equivalent rights or other
consideration as determined by the Company.

         This Rights Certificate, with or without other Rights Certificates,
upon surrender at the office of the Rights Agent designated for such purpose,
may be exchanged for another Rights Certificate or Rights Certificates of like
tenor and date evidencing Rights entitling the holder to purchase a like
aggregate amount of securities as the Rights evidenced by the Rights Certificate
or Rights Certificates surrendered shall have entitled such holder to purchase.
If this Rights Certificate shall be exercised in part, the holder shall be
entitled to receive upon surrender hereof another Rights Certificate or Rights
Certificates for the number of whole Rights not exercised.

         No fractional portion less than integral multiples of one
one-thousandth of a Preferred Share 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 the
Preferred Shares or of any other securities of the Company which may at any time
be issuable on 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 stockholder of the Company or any right to vote for the
election of directors or upon any matter submitted to stockholders at any
meeting thereof, or to give or withhold consent to any corporate action, or to
receive notice of meetings or other actions affecting stockholders (except as
provided in the Rights Agreement), or to receive dividends or subscription
rights, or otherwise, until the Right or Rights evidenced by this Rights
Certificate shall have been exercised as provided in the Rights Agreement.

         This Rights Certificate shall not be valid or obligatory for any
purpose until it shall have been countersigned by an authorized signatory of the
Rights Agent.



                                      -2-
<PAGE>   49

         WITNESS the facsimile signature of the proper officers of the Company
and its corporate seal. Dated as of __________ , 19__.



ATTEST:                                 CONNETICS CORPORATION



                                        By:
- -------------------------------------       -------------------------------
Secretary                                   President



Countersigned:

U.S. Stock Transfer Corporation


- -------------------------------------
as Rights Agent

By:
- -------------------------------------
      Authorized Signatory

Date of countersignature:
                          -----------




                                      -3-
<PAGE>   50



                   FORM OF REVERSE SIDE OF RIGHTS CERTIFICATE


                               FORM OF ASSIGNMENT

         (To be executed by the registered holder if such holder desires
                      to transfer the Rights Certificate)



FOR VALUE RECEIVED _______________________________________________ hereby sells,
assigns and transfers unto _____________________________________________________
                           (Please print name and address of transferee)

________________________________________________________________________________
this Rights Certificate, together with all right, title and interest therein,
and does hereby irrevocably constitute and appoint ___________________ Attorney,
to transfer the Rights Certificate on the books of the within-named Company, 
with full power of substitution.

Dated: ________________, 19__




                                        ______________________________________
                                        Signature


Signature Guaranteed:

         Signatures must be guaranteed by a member firm of a registered national
securities exchange, a member of the National Association of Securities Dealers,
Inc., a commercial bank or trust company having an office or correspondent in
the United States or any other member of a medallion signature guarantee program
approved by the Securities Transfer Association.



<PAGE>   51


                                   CERTIFICATE

The undersigned hereby certifies by checking the appropriate boxes that:

                  (1) this Rights Certificate [ ] is [ ] is not being sold,
assigned and transferred by or on behalf of a Person who is or was an Acquiring
Person, or an Affiliate or Associate of any such Person (as such terms are
defined in the Rights Agreement);

                  (2) after due inquiry and to the best knowledge of the
undersigned, it [ ] did [ ] did not acquire the Rights evidenced by this Rights
Certificate from any Person who is, was or subsequently became an Acquiring
Person or an Affiliate or Associate of any such Person.

Dated: _____________________, _______



                                        __________________________________
                                        Signature


Signature Guaranteed:

         Signatures must be guaranteed by a member firm of a registered national
securities exchange, a member of the National Association of Securities Dealers,
Inc., a commercial bank or trust company having an office or correspondent in
the United States or any other member of a medallion signature guarantee program
approved by the Securities Transfer Association.




                                      -2-
<PAGE>   52


             Form of Reverse Side of Rights Certificate -- continued

                          FORM OF ELECTION TO PURCHASE

      (To be executed if holder desires to exercise the Rights Certificate)



To: ________________________________

         The undersigned hereby irrevocably elects to exercise ________________
Rights represented by this Rights Certificate to purchase the number of
one-thousandths of a Preferred Share issuable upon the exercise of such Rights
and requests that certificates for such number of one-thousandths of a Preferred
Share be issued in the name of:

Please insert social security or other identifying number

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

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

Please insert social security or other identifying number

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

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


Dated: __________________, ______



                                        ______________________________________
                                        Signature




Signature Guaranteed:

         Signatures must be guaranteed by a member firm of a registered national
securities exchange, a member of the National Association of Securities Dealers,
Inc., a commercial bank or trust company having an office or correspondent in
the United States or any other member of a medallion signature guarantee program
approved by the Securities Transfer Association.




                                      -3-
<PAGE>   53


                                   CERTIFICATE

         The undersigned hereby certifies by checking the appropriate boxes
that:

                  (1) the Rights evidenced by this Rights Certificate [ ] are [
] are not being exercised by or on behalf of a Person who is or was an Acquiring
Person or an Affiliate or Associate of any such Person (as such terms are
defined in the Rights Agreement);

                  (2) after due inquiry and to the best knowledge of the
undersigned, it [ ] did [ ] did not acquire the Rights evidenced by this Rights
Certificate from any Person who is, was or subsequently became an Acquiring
Person or an Affiliate or Associate of any such Person.

Dated: _______________________, ______




                                        ____________________________________
                                        Signature

Signature Guaranteed:

         Signatures must be guaranteed by a member firm of a registered national
securities exchange, a member of the National Association of Securities Dealers,
Inc., a commercial bank or trust company having an office or correspondent in
the United States or any other member of a medallion signature guarantee program
approved by the Securities Transfer Association.




                                      -4-
<PAGE>   54


             Form of Reverse Side of Rights Certificate -- continued

                                     NOTICE

         The signature in the foregoing Forms of Assignment and Election must
conform to the name as written upon the face of this Rights Certificate in every
particular, without alteration or enlargement or any change whatsoever.









                                      -5-
<PAGE>   55
                                   EXHIBIT C

                              CONNETICS CORPORATION

                             STOCKHOLDER RIGHTS PLAN

                                SUMMARY OF RIGHTS


<TABLE>
<S>                            <C>
Distribution and               The Board of Directors has declared a dividend of
Transfer of Rights;            one Right for each share of Common Stock of
Rights Certificate:            Connetics Corporation (the "COMPANY")
                               outstanding.  Prior to the Distribution Date
                               referred to below, the Rights will be evidenced
                               by and trade with the certificates for the Common
                               Stock. After the Distribution Date, the Company
                               will mail Rights certificates to the Company's
                               stockholders and the Rights will become
                               transferable apart from the Common Stock.

Distribution Date:             Rights will separate from the Common Stock and
                               become exercisable following the tenth day (or
                               such later date as may be determined by a
                               majority of the Company's Directors not
                               affiliated with the acquiring person or group
                               (the "CONTINUING DIRECTORS")) after a person or
                               group (a) acquires beneficial ownership of 15% or
                               more of the Company's Common Stock or (b)
                               announces a tender or exchange offer, the
                               consummation of which would result in ownership
                               by a person or group of 15% or more of the
                               Company's Common Stock (the "DISTRIBUTION DATE").

Preferred Stock                After the Distribution Date, each Right will
Purchasable Upon               entitle the holder to purchase, for $49, a
Exercise of Rights:            fraction of a share of the Company's Preferred
                               Stock with economic terms similar to that of one
                               share of the Company's Common Stock.

Flip-In:                       If an acquiror (an "ACQUIRING PERSON") obtains
                               15% or more of the Company's Common Stock (other
                               than pursuant to a tender offer deemed fair by
                               the Board of Directors (a "PERMITTED OFFER")),
                               then each Right (other than Rights owned by an
                               Acquiring Person or its affiliates) will entitle
                               the holder thereof to purchase, for the exercise
                               price, a number of shares of the Company's Common
                               Stock having a then current market value of twice
                               the exercise price.

</TABLE>



<PAGE>   56

<TABLE>
<S>                            <C>
Flip-Over:                     If, after the Shares Acquisition Date (defined
                               below), (a) the Company merges into another
                               entity, (b) an acquiring entity merges into the
                               Company or (c) the Company sells more than 50% of
                               the Company's assets or earning power, then each
                               Right (other than Rights owned by an Acquiring
                               Person or its affiliates) will entitle the holder
                               thereof to purchase, for the exercise price, a
                               number of shares of Common Stock of the person
                               engaging in the transaction having a then current
                               market value of twice the exercise price (unless
                               the transaction satisfies certain conditions and
                               is consummated with a person who acquired shares
                               pursuant to a Permitted Offer, in which case the
                               Rights will expire).

Exchange Provision:            At any time after an Acquiring Person obtains 15%
                               or more of the Company's Common Stock (other than
                               pursuant to a Permitted Offer) and prior to the
                               acquisition by the Acquiring Person of 50% or
                               more of the outstanding Common Stock, the Board
                               of Directors of the Company may exchange the
                               Rights (other than Rights owned by the Acquiring
                               Person or its affiliates), in whole or in part,
                               at an exchange ratio of one Common Share per
                               Right (subject to adjustment).

Redemption of                  Rights will be redeemable at the Company's option
the Rights:                    for $0.01 per Right at any time on or prior to
                               the tenth day (or such later date as may be
                               determined by a majority of the Continuing
                               Directors) after public announcement that a
                               person has acquired beneficial ownership of 15%
                               or more of the Company's Common Stock (the
                               "SHARES ACQUISITION DATE").
                               
Expiration of                  The Rights expire on the earliest of (a) April
the Rights:                    29, 2007, (b) exchange or redemption of the
                               Rights as described above, or (c) consummation of
                               a merger or consolidation or sale of assets
                               resulting in expiration of the Rights as
                               described above.

Amendment of Terms             The terms of the Rights and the Rights Agreement
of Rights:                     may be amended in any respect without the consent
                               of the Rights holders on or prior to the
                               Distribution Date; thereafter, the terms of the
                               Rights and the Rights Agreement may be amended
                               without the consent of the Rights holders in
                               order to cure any ambiguities or to make changes
                               which do not adversely affect the interests of
                               Rights holders (other than the Acquiring Person).

Voting Rights:                 Rights will not have any voting rights.

Anti-Dilution                  Rights will have the benefit of certain customary
                               anti-dilution provisions.
Provisions:

Taxes:                         The Rights distribution should not be taxable for
                               federal income tax purposes. However, following
                               an event which renders the Rights exercisable or
                               upon redemption of the Rights, stockholders may
                               recognize taxable income. 

</TABLE>


<PAGE>   57

The foregoing is a summary of certain principal terms of the Stockholder Rights
Plan only and is qualified in its entirety by reference to the detailed terms of
the Rights Agreement dated as of May 20, 1997, between the Company and the
Rights Agent.





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