BARR LABORATORIES INC
S-3, EX-1.1, 2000-09-14
PHARMACEUTICAL PREPARATIONS
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<PAGE>   1
                                                                     Exhibit 1.1
                             BARR LABORATORIES, INC.
                                3,500,000 Shares
                                  Common Stock
                                ($.01 Par Value)


                             UNDERWRITING AGREEMENT








October   , 2000
<PAGE>   2
                             BARR LABORATORIES, INC.
                                3,500,000 Shares
                                  Common Stock
                                ($.01 par value)


                             UNDERWRITING AGREEMENT


                                                               October    , 2000


Banc of America Securities LLC
  (as Representative of the Several Underwriters)
9 West 57th Street
New York, New York  10019

Dear Sirs:

                  Barr Laboratories, Inc. (the "Company") proposes to issue and
sell and the corporation named in Schedule B annexed hereto (the "Selling
Stockholder") proposes to sell to the underwriters named in Schedule A annexed
hereto (the "Underwriters") an aggregate of 3,500,000 shares (the "Firm Shares")
of Common Stock, $.01 par value (the "Common Stock"), of the Company, of which
500,000 shares are to be issued and sold by the Company and an aggregate of
3,000,000 shares are to be sold by the Selling Stockholder. In addition, solely
for the purpose of covering over-allotments, the Selling Stockholder proposes to
grant to the Underwriters the option to purchase from the Selling Stockholder up
to an additional 525,000 shares of Common Stock (the "Additional Shares"). The
Firm Shares and the Additional Shares are hereinafter collectively sometimes
referred to as the "Shares." The Shares are described in the Prospectus which is
referred to below.

                  The Company has filed, in accordance with the provisions of
the Securities Act of 1933, as amended, and the rules and regulations thereunder
(collectively, the "Act"), with the Securities and Exchange Commission (the
"Commission") a registration statement on Form S-3, including a prospectus,
relating to the Shares, which incorporates by reference documents which the
Company has filed in accordance with the provisions of the Securities Exchange
Act of 1934, as amended, and the rules and regulations thereunder (collectively,
the "Exchange Act"). The Company has furnished to you, for use by the
Underwriters and by dealers, copies of one or more preliminary prospectuses and
the documents incorporated by reference therein (each thereof,
<PAGE>   3
                                      -2-


including the documents incorporated therein by reference, being herein called a
"Preliminary Prospectus") relating to the Shares. Except where the context
otherwise requires, the registration statement, as amended when it becomes
effective, including all documents filed as a part thereof or incorporated by
reference therein, and including any information contained in a prospectus
subsequently filed with the Commission pursuant to Rule 424(b) under the Act and
deemed to be part of the registration statement at the time of effectiveness
pursuant to Rule 430A under the Act, is herein called the "Registration
Statement," and the prospectus, including all documents incorporated therein by
reference, in the form filed by the Company with the Commission pursuant to Rule
424(b) under the Act or, if no such filing is required, the form of final
prospectus included in the Registration Statement at the time it became
effective, is herein called the "Prospectus."

                  The Company, the Selling Stockholder and the Underwriters
agree as follows:

                  1. Sale and Purchase. Upon the basis of the warranties and
representations and the other terms and conditions herein set forth, the Company
and the Selling Stockholder, severally and not jointly, agree to sell to the
respective Underwriters and each of the Underwriters, severally and not jointly,
agrees to purchase from the Company and the Selling Stockholder the respective
number of Firm Shares (subject to such adjustment as you may determine to avoid
fractional shares) which bears the same proportion to the number of Firm Shares
to be sold by the Company or by the Selling Stockholder, as the case may be, as
the number of Firm Shares set forth opposite the name of such Underwriter in
Schedule A annexed hereto bears to the total number of Firm Shares to be sold by
the Company and the Selling Stockholder, in each case at a purchase price of $
per Share. The Company and the Selling Stockholder are advised by you that the
Underwriters intend (i) to make a public offering of their respective portions
of the Firm Shares as soon after the effective date of the Registration
Statement as in your judgment is advisable and (ii) initially to offer the Firm
Shares upon the terms set forth in the Prospectus. You may from time to time
increase or decrease the public offering price after the initial public offering
to such extent as you may determine.

                  In addition, the Selling Stockholder hereby grants to the
several Underwriters the option to purchase, and upon the basis of the
warranties and representations and the other terms and conditions herein set
forth, the Underwriters shall have
<PAGE>   4
                                      -3-


the right to purchase, severally and not jointly, from the Selling Stockholder,
ratably in accordance with the number of Firm Shares to be purchased by each of
them (subject to such adjustment as you shall determine to avoid fractional
shares), all or a portion of the Additional Shares as may be necessary to cover
over-allotments made in connection with the offering of the Firm Shares, at the
same purchase price per share to be paid by the Underwriters to the Selling
Stockholder and the Company for the Firm Shares. This option may be exercised at
any time (but not more than once) on or before the thirtieth day following the
date hereof, by written notice to the Selling Stockholder. Such notice shall set
forth the aggregate number of Additional Shares as to which the option is being
exercised, and the date and time when the Additional Shares are to be delivered
(such date and time being herein referred to as the "additional time of
purchase"); provided, however, that the additional time of purchase shall not be
earlier than the time of purchase (as defined below) nor earlier than the second
business day(1) after the date on which the option shall have been exercised nor
later than the tenth business day after the date on which the option shall have
been exercised. The number of Additional Shares to be sold to each Underwriter
shall be the number which bears the same proportion to the aggregate number of
Additional Shares being purchased as the number of Firm Shares set forth
opposite the name of such Underwriter on Schedule A hereto bears to the total
number of Firm Shares (subject, in each case, to such adjustment as you may
determine to eliminate fractional shares).

                  Pursuant to a power of attorney, which shall be satisfactory
to counsel for the Underwriters, granted by the Selling Stockholder (the "Power
of Attorney"), Alex Glasenberg will act as representative of the Selling
Stockholder. The foregoing representative (the "Representative of the Selling
Stockholder") is authorized, on behalf of the Selling Stockholder, to execute
any documents necessary or desirable in connection with the sale of the Shares
to be sold hereunder by the Selling Stockholder, to make delivery of the
certificates of such Shares, to receive the proceeds of the sale of such Shares,
to give receipts for such proceeds, to pay therefrom the expenses to be borne by
the Selling Stockholder in connection with the sale and public offering of the
Shares, to distribute the bal-


---------------------
1    As used herein "business day" shall mean a day on which the New York Stock
     Exchange is open for trading.
<PAGE>   5
                                      -4-


ance of such proceeds to the Selling Stockholder, to receive notices on behalf
of the Selling Stockholder and to take such other action as may be necessary or
desirable in connection with the transactions contemplated by this Agreement.

                  2. Payment and Delivery. Payment of the purchase price for the
Firm Shares shall be made to the Company and the Selling Stockholder by Federal
(same day) funds, against delivery of the certificates for the Firm Shares to
you through the facilities of The Depository Trust Company (the "DTC") in the
form of a global certificate or certificates registered in the name of Cede &
Co., the nominee of the DTC at the offices of Cahill Gordon & Reindel in New
York City, for the respective accounts of the Underwriters. Such payment and
delivery shall be made at 9:00 A.M., New York City time, on , 2000 (unless
another time shall be agreed to by you and the Selling Stockholder or unless
postponed in accordance with the provisions of Section 10 hereof). The time at
which such payment and delivery are actually made is hereinafter sometimes
called the "time of purchase." Certificates for the Firm Shares shall be issued
in the name of Cede & Co. or in such names and in such denominations as you
shall specify on the second business day preceding the time of purchase. For the
purpose of expediting the checking of the certificates for the Firm Shares by
you, the Company and the Selling Stockholder agree to make such certificates
available to you for such purpose at least one full business day preceding the
time of purchase.

                  Payment of the purchase price for the Additional Shares shall
be made at the additional time of purchase in the same manner and at the same
office as the payment for the Firm Shares. Certificates for the Additional
Shares shall be issued in the name of Cede & Co. or in such names and in such
denominations as you shall specify on the second business day preceding the
additional time of purchase. For the purpose of expediting the checking of the
certificates for the Additional Shares by you, the Selling Stockholder agrees to
make such certificates available to you for such purpose at least one full
business day preceding the additional time of purchase.

                  3. Representations and Warranties of the Company. The Company
represents and warrants to each of the Underwriters that:

                  (a) when the Registration Statement becomes effective, the
         Registration Statement and the Prospectus will fully comply in all
         material respects with the provisions of the Act, and the Registration
         Statement
<PAGE>   6
                                      -5-


         will not contain an untrue statement of a material fact or omit to
         state a material fact required to be stated therein or necessary to
         make the statements therein not misleading, and the Prospectus will not
         contain an untrue statement of a material fact or omit to state a
         material fact required to be stated therein or necessary to make the
         statements therein, in light of the circumstances under which they were
         made, not misleading; provided, however, that the Company makes no
         warranty or representation with respect to any statement contained in
         the Registration Statement or the Prospectus in reliance upon and in
         conformity with information concerning the Underwriters and furnished
         in writing by or on behalf of any Underwriter through you to the
         Company expressly for use in the Registration Statement or the
         Prospectus; the documents incorporated by reference in the Prospectus,
         at the time they were filed with the Commission, complied in all
         material respects with the requirements of the Exchange Act, and do not
         contain an untrue statement of a material fact or omit to state a
         material fact required to be stated therein or necessary to make the
         statements therein, in light of the circumstances under which they were
         made, not misleading;

                  (b) as of the date of this Agreement, the Company has an
         authorized capitalization as set forth under the heading entitled
         "Actual" in the section of the Registration Statement and the
         Prospectus entitled "Capitalization" and, as of the time of purchase
         and the additional time of purchase, as the case may be, the Company
         shall have an authorized capitalization as set forth under the heading
         entitled "As Adjusted" in the section of the Registration Statement and
         the Prospectus entitled "Capitalization"; all of the issued and
         outstanding shares of capital stock including Common Stock of the
         Company have been duly and validly authorized and issued and are fully
         paid and non-assessable; the Company has been duly incorporated and is
         validly existing as a corporation in good standing under the laws of
         the State of New York, with full power and authority to own its
         properties and conduct its business as described in the Registration
         Statement and the Prospectus, to execute and deliver this Agreement and
         to issue and sell the Shares as herein contemplated;

                  (c) the Company and each of its subsidiaries (the
         "Subsidiaries") are duly qualified or licensed by and
<PAGE>   7
                                      -6-


         are in good standing in each jurisdiction in which they conduct their
         respective businesses and in which the failure, individually or in the
         aggregate, to be so licensed or qualified could have a material adverse
         effect on the operations, business, condition, prospects or property of
         the Company and its Subsidiaries, taken as a whole (a "Material Adverse
         Effect"); and the Company and each of its Subsidiaries are in
         compliance in all material respects with the laws, orders, rules,
         regulations and directives issued or administered by such
         jurisdictions;

                  (d) neither the Company nor any of its Subsidiaries is in
         breach of, or in default under (nor has any event occurred which with
         notice, lapse of time, or both would constitute a breach of, or default
         under), its respective charter or by-laws or in the performance or
         observance of any obligation, agreement, covenant or condition
         contained in any indenture, mortgage, deed of trust, bank loan or
         credit agreement or other agreement or instrument to which the Company
         or any of its Subsidiaries is a party or by which any of them is bound
         and which could have a Material Adverse Effect, and the execution,
         delivery and performance of this Agreement and the consummation of the
         transactions contemplated hereby will not conflict with, or result in
         any breach of or constitute a default under (nor constitute any event
         which with notice, lapse of time, or both would constitute a breach of,
         or default under), any provisions of the charter or by-laws, of the
         Company or any of its Subsidiaries or under any provision of any
         license, indenture, mortgage, deed of trust, bank loan or credit
         agreement or other agreement or instrument to which the Company or any
         of its Subsidiaries is a party or by which any of them or their
         respective properties may be bound or affected, or under any federal,
         state, local or foreign law, regulation or rule or any decree, judgment
         or order applicable to the Company or any of its Subsidiaries;

                  (e) this Agreement has been duly authorized, executed and
         delivered by the Company and is a legal, valid and binding agreement of
         the Company enforceable in accordance with its terms, except as rights
         to indemnity and contribution hereunder may be limited by securities
         laws and except as the enforceability hereof may be limited by
         bankruptcy, insolvency, reorganiza-
<PAGE>   8
                                      -7-


         tion, moratorium or similar laws affecting creditors' rights generally
         and general principles of equity;

                  (f) the capital stock of the Company, including the Shares,
         conforms in all material respects to the description thereof contained
         in the Registration Statement and Prospectus and the certificates for
         the Shares are in due and proper form and the holders of the Shares
         will not be subject to personal liability by reason of being such
         holders;

                  (g) no approval, authorization, consent or order of or filing
         with any federal, state, local or foreign governmental or regulatory
         commission, board, body, authority or agency is required in connection
         with the issuance and sale of the Shares as contemplated hereby other
         than registration of the Shares under the Act and any necessary
         qualification under the securities or blue sky laws of the various
         jurisdictions in which the Shares are being offered by the
         Underwriters;

                  (h) no person has the right, contractual or otherwise, to
         cause the Company to issue to it, or register pursuant to the Act, any
         shares of capital stock of the Company upon the issue and sale of the
         Shares to the Underwriters hereunder, nor does any person have
         preemptive rights, rights of first refusal or other rights to purchase
         any of the Shares;

                  (i) Deloitte & Touche LLP, whose reports on the consolidated
         financial statements of the Company and its Subsidiaries are filed with
         the Commission as part of the Registration Statement and Prospectus,
         are independent public accountants as required by the Act;

                  (j) each of the Company and its Subsidiaries has all necessary
         licenses, authorizations, consents and approvals and has made all
         necessary filings required under any federal, state, local or foreign
         law, regulation or rule, and has obtained all necessary authorizations,
         consents and approvals from other persons, in order to conduct its
         respective business, except where the absence of any such license,
         authorization, consent approval or filing could not have a Material
         Adverse Effect; neither the Company nor any of its Subsidiaries is in
         violation of, or in default under (nor has any event occurred which
         with notice, lapse of time, or both would constitute a violation of or
         a default un-
<PAGE>   9
                                      -8-


         der), any such license, authorization, consent or approval or any
         federal, state, local or foreign law, regulation or rule or any decree,
         order or judgment applicable to the Company or any of its Subsidiaries
         the effect of which could have a Material Adverse Effect;

                  (k) all legal or governmental proceedings, contracts or
         documents of a character required to be described in the Registration
         Statement or the Prospectus or to be filed as an exhibit to the
         Registration Statement have been so described or filed as required;

                  (l) except as described in the Registration Statement, there
         are no actions, suits or proceedings pending or threatened against the
         Company or any of its Subsidiaries or any of their respective
         properties, at law or in equity, or before or by any federal, state,
         local or foreign governmental or regulatory commission, board, body,
         authority or agency which could result in a judgment, decree or order
         having a Material Adverse Effect; the Company is not a party nor
         subject to the provisions of any material injunction, judgment, decree
         or order of any court, regulatory body or other governmental agency or
         body;

                  (m) the audited financial statements included in the
         Registration Statement and the Prospectus present fairly the
         consolidated financial position of the Company and its Subsidiaries as
         of the dates indicated and the consolidated results of operations and
         changes in financial position of the Company and its Subsidiaries for
         the periods specified; such financial statements have been prepared in
         conformity with generally accepted accounting principles applied on a
         consistent basis during the periods involved;

                  (n) the unaudited interim financial statements included in the
         Registration Statement and the Prospectus present fairly the condensed
         consolidated financial position of the Company and its Subsidiaries as
         of the dates indicated and the condensed consolidated results of
         operations and changes in cash flows of the Company and the
         Subsidiaries for the periods specified, subject to normal year-end
         adjustments; such financial statements have been prepared in conformity
         with generally accepted accounting principles applied on a consistent
         basis during the periods involved;
<PAGE>   10
                                      -9-


                  (o) subsequent to the respective dates as of which information
         is given in the Registration Statement and Prospectus, and except as
         may be otherwise stated in the Registration Statement or Prospectus,
         there has not been (A) any material adverse change, financial or
         otherwise, in the business, properties, prospects, regulatory
         environment, results of operations or condition (financial or
         otherwise), present or prospective, of the Company and its Subsidiaries
         taken as a whole, (B) any transaction, which is material to the Company
         and its Subsidiaries taken as a whole, contemplated or entered into by
         the Company or any of its Subsidiaries or (C) any obligation,
         contingent or otherwise, directly or indirectly incurred by the Company
         or any of its Subsidiaries which is material to the Company and its
         Subsidiaries taken as a whole;

                  (p) the Company has obtained the agreement of each of its
         directors and executive officers, the Selling Stockholder and certain
         of its other stockholders not to directly or indirectly sell, offer,
         pledge, contract to sell or grant any option to purchase or otherwise
         dispose of or transfer any shares of Common Stock, or securities
         convertible into or exchangeable or exercisable for Common Stock,
         including without limitation, options, warrants, convertible bonds and
         the like for a period of 90 days after the date of the Prospectus
         without the prior written consent of Banc of America Securities LLC
         (which consent shall not be unreasonably withheld);

                  (q) except as disclosed in the Registration Statement and
         Prospectus, the Company and its Subsidiaries own or possess the right
         to use all patents, trademarks (including the Company's name, together
         with its logo), trademark registrations, service marks, service mark
         registrations, trade names, copyrights, licenses, inventions, trade
         secrets, know-how and rights described in the Prospectus as being owned
         by them or any of them or necessary for the conduct of their respective
         businesses, and the Company is not aware of any claim to the contrary
         or any challenge by any other person to the rights of the Company and
         its Subsidiaries with respect to the foregoing. Except as described in
         the Prospectus, no claim has been made against or notice given to the
         Company alleging the infringement or other violation by the Company of
         any patent, trademark, service mark, trade name, copyright,
<PAGE>   11
                                      -10-


         trade secret, license or other intellectual property right or franchise
         right of any person; and

                  (r) neither the Company nor any of its Subsidiaries is or,
         after application of the net proceeds of the offering as described
         under the caption "Use of Proceeds" in the Prospectus, will become an
         entity required to register as an "investment company" or an entity
         "controlled" by an entity required to register as an "investment
         company" as such terms are defined in the Investment Company Act of
         1940, as amended and the rules and regulations of the Commission
         thereunder (the "Investment Company Act"). The Company intends to
         conduct its business in a manner such that it will not become an entity
         required to register as an "investment company" subject to regulation
         under the Investment Company Act.

                  4. Representations and Warranties of the Selling Stockholder.
The Selling Stockholder represents and warrants to each Underwriter that:

                  (a) such Selling Stockholder now is and at the time of
         delivery of such Shares will be, the lawful owner of the number of
         Shares to be sold by such Selling Stockholder pursuant to this
         Agreement and has and, at the time of delivery thereof, will have valid
         title to such Shares, and upon delivery of and payment for such Shares,
         the Underwriters will acquire valid title to such Shares free and clear
         of any claim, lien, encumbrance, security interest, restriction on
         transfer or other defect in title;

                  (b) such Selling Stockholder has, and at the time of delivery
         of such Shares will have, all requisite corporate power and capacity,
         and any approval required by law (other than those imposed by the Act
         and the securities or blue sky laws of various jurisdictions in which
         the Shares are being offered by the Underwriters), to sell and deliver
         such Shares in the manner provided in this Agreement;

                  (c) this Agreement, the Power of Attorney and the Custody
         Agreement among the Company, as custodian, and the Selling Stockholder
         (the "Custody Agreement") have been duly executed and delivered by such
         Selling Stockholder and each is a legal, valid and binding agreement of
         such Selling Stockholder enforceable in accordance
<PAGE>   12
                                      -11-


         with its respective terms, in the case of this Agreement, except as
         rights to indemnity and contribution hereunder may be limited by
         securities laws and except as the enforceability hereof may be limited
         by bankruptcy, insolvency, reorganization, moratorium or similar laws
         affecting creditors' rights generally and general principles of equity;

                  (d) when the Registration Statement becomes effective and at
         all times subsequent thereto through the latest of the time of
         purchase, additional time of purchase or the termination of the
         offering of the Shares, the Registration Statement and Prospectus, and
         any supplements or amendments thereto as they relate to such Selling
         Stockholder will not contain an untrue statement of a material fact or
         omit to state a material fact required to be stated therein or
         necessary to make the statements therein, in light of the circumstances
         under which they were made, not misleading;

                  (e) such Selling Stockholder has duly and irrevocably
         authorized the Representative of the Selling Stockholder, on behalf of
         such Selling Stockholder, to execute and deliver this Agreement and any
         other document necessary or desirable in connection with the
         transactions contemplated hereby and to deliver the Shares to be sold
         by such Selling Stockholder and receive payment therefor pursuant
         hereto; and

                  (f) the sale of such Selling Stockholder's Shares pursuant to
         this Agreement is not prompted by any material information concerning
         the Company which is not set forth in the Prospectus.

                  5. Certain Covenants of the Company. The Company hereby
agrees:

                  (a) to furnish such information as may be required and
         otherwise to cooperate in qualifying the Shares for offering and sale
         under the securities or blue sky laws of such jurisdictions as you may
         designate and to maintain such qualifications in effect so long as
         required for the distribution of the Shares, provided that the Company
         shall not be required to qualify as a foreign corporation or to consent
         to the service of process under the laws of any such jurisdiction
         (except service of process with respect to the offering and sale of the
         Shares); and to promptly advise
<PAGE>   13
                                      -12-


         you of the receipt by the Company of any notification with respect to
         the suspension of the qualification of the Shares for sale in any
         jurisdiction or the initiation or threatening of any proceeding for
         such purpose;

                  (b) to make available to you in New York City, as soon as
         practicable after the Registration Statement becomes effective, and
         thereafter from time to time to furnish to the Underwriters, as many
         copies of the Prospectus (or of the Prospectus as amended or
         supplemented if the Company shall have made any amendments or
         supplements thereto after the effective date of the Registration
         Statement) as the Underwriters may request for the purposes
         contemplated by the Act;

                  (c) to advise you promptly and (if requested by you) to
         confirm such advice in writing, (i) when the Registration Statement has
         become effective and when any post-effective amendment thereto becomes
         effective and (ii) if Rule 430A under the Act is used, when the
         Prospectus is filed with the Commission pursuant to Rule 424(b) under
         the Act (which the Company agrees to file in a timely manner under such
         rules);

                  (d) to advise you promptly, confirming such advice in writing,
         of any request by the Commission for amendments or supplements to the
         Registration Statement or Prospectus or for additional information with
         respect thereto, or of notice of institution of proceedings for, or the
         entry of a stop order suspending the effectiveness of the Registration
         Statement and, if the Commission should enter a stop order suspending
         the effectiveness of the Registration Statement, to make every
         reasonable effort to obtain the lifting or removal of such order as
         soon as possible; to advise you promptly of any proposal to amend or
         supplement the Registration Statement or Prospectus including by filing
         any document that would be incorporated therein by reference and to
         file no such amendment or supplement to which you shall object in
         writing;

                  (e) to furnish to you and, upon request, to each of the other
         Underwriters for a period of five years from the date of this Agreement
         (i) copies of any reports or other communications which the Company
         shall send to its stockholders or shall from time to time publish or
         publicly disseminate, (ii) copies of all annual, quarterly and current
         reports filed with the Com-
<PAGE>   14
                                      -13-


         mission on Forms 10-K, 10-Q and 8-K, or such other similar form as may
         be designated by the Commission and (iii) such other information as you
         may reasonably request regarding the Company or its Subsidiaries;

                  (f) to advise the Underwriters promptly of the happening of
         any event known to the Company within the time during which a
         prospectus relating to the Shares is required to be delivered under the
         Act which, in the judgment of the Company, would require the making of
         any change in the Prospectus then being used, or in the information
         incorporated therein by reference, so that the Prospectus would not
         include an untrue statement of material fact or omit to state a
         material fact necessary to make the statements therein, in the light of
         the circumstances under which they are made, not misleading, and,
         during such time, to prepare and furnish, at the Company's expense, to
         the Underwriters promptly such amendments or supplements to such
         Prospectus as may be necessary to reflect any such change and to
         furnish you a copy of such proposed amendment or supplement before
         filing any such amendment or supplement with the Commission;

                  (g) as soon as practicable and for the time period specified
         by Rule 158 under the Act, to make generally available to its
         securityholders, and to deliver to you, an earnings statement of the
         Company that will satisfy the provisions of Section 11(a) of the Act
         and Rule 158 under the Act;

                  (h) to furnish to you four signed copies of the Registration
         Statement, as initially filed with the Commission, and of all
         amendments thereto (including all exhibits thereto and documents
         incorporated by reference therein) and sufficient conformed copies of
         the foregoing (other than exhibits) for distribution of a copy to each
         of the other Underwriters;

                  (i) to furnish to you as early as practicable prior to the
         time of purchase and the additional time of purchase, as the case may
         be, but not later than two business days prior thereto, a copy of the
         latest available unaudited interim consolidated financial statements,
         if any, of the Company and its Subsidiaries which have been read by the
         Company's independent certified public accountants, as stated in their
         letter to
<PAGE>   15
                                      -14-


         be furnished pursuant to Section 8(c) of this Agreement;

                  (j) to apply the net proceeds from the sale of the Shares in
         the manner set forth under the caption "Use of Proceeds" in the
         Prospectus;

                  (k) to furnish to you, before filing with the Commission
         subsequent to the effective date of the Registration Statement and
         during the period referred to in paragraph (f) above, a copy of any
         document proposed to be filed pursuant to Sections 13, 14 or 15(d) of
         the Exchange Act;

                  (l) not to issue, directly or indirectly sell, offer, pledge,
         contract to sell or grant any option to purchase or otherwise dispose
         of or transfer any shares of Common Stock, or securities convertible
         into or exchangeable or exercisable for Common Stock, including without
         limitation, options, convertible bonds and the like or permit the
         registration under the Act of any shares of Common Stock for a period
         of 90 days after the date of the Prospectus, without the prior written
         consent of Banc of America Securities LLC (which consent shall not be
         unreasonably withheld), except for the registration of the Shares and
         the sales to the Underwriters pursuant to this Agreement and except for
         grants of options or issuances of Common Stock upon the exercise of
         outstanding options pursuant to any of the Company's stock option plans
         existing as of the date hereof; and

                  (m) to use its best efforts to cause the Shares to be listed
         on the New York Stock Exchange.

                  6. Certain Covenants of the Company and the Selling
Stockholder. The Company and the Selling Stockholder agree with each Underwriter
as follows:

                  (a) the Company and the Selling Stockholder agree that,
         whether or not the transactions contemplated hereby are consummated or
         this Agreement is terminated, the Company and the Selling Stockholder,
         in such proportions (aggregating 100%) as the number of Shares to be
         sold by the Company and by the Selling Stockholder bears to the total
         number of Shares or as they otherwise may determine among themselves
         (or as indicated below), will pay all expenses, fees and taxes (other
<PAGE>   16
                                      -15-


         than any transfer taxes and fees and disbursements of counsel for the
         Underwriters except as set forth under Section 7 hereof or clause (iii)
         (which expenses or fees shall be paid by the Company and the Selling
         Stockholder) or clause (iv) (which expenses or fees shall be paid by
         the Company) of this Section 6(a)) in connection with (i) the
         preparation and filing of the Registration Statement, each Preliminary
         Prospectus, the Prospectus, and any amendments or supplements thereto,
         and the printing and furnishing of copies of each thereof to the
         Underwriters and to dealers (including costs of mailing and shipment),
         (ii) the issuance, sale and delivery of the Shares by the Company and
         the Selling Stockholder, (iii) the word processing and/or printing of
         this Agreement, any Agreement Among Underwriters, any dealer
         agreements, any Statements of Information, the Custody Agreement and
         the Power of Attorney and the reproduction and/or printing and
         furnishing of copies of each thereof to the Underwriters and to dealers
         (including costs of mailing and shipment), (iv) the qualification of
         the Shares for offering and sale under state laws and the determination
         of their eligibility for investment under state law as aforesaid
         (including the legal fees and filing fees and other disbursements of
         counsel to the Underwriters) and the word processing and/or printing
         and furnishing of copies of any blue sky surveys or legal investment
         surveys to the Underwriters and to dealers, (v) any listing of the
         Shares on any securities exchange or qualification of the Shares for
         quotation on the New York Stock Exchange and any registration thereof
         under the Exchange Act (which expenses or fees shall be paid by the
         Company), (vi) the filing for review of the public offering of the
         Shares by the National Association of Securities Dealers, Inc. (the
         "NASD"), (vii) the performance of the Company's and the Selling
         Stockholder's other obligations hereunder and (vii) the fees and
         disbursements of counsel and accountants to the Company in connection
         with the foregoing and the other transactions contemplated hereby;

                  (b) the Selling Stockholder will pay all underwriting
         discounts and commissions, and will pay all transfer taxes and all fees
         and disbursements of any counsel or accountant retained by it, in
         connection with the sale of the Shares to be sold hereunder by the
         Selling Stockholder; and
<PAGE>   17
                                      -16-


                  (c) the Company and the Selling Stockholder will not issue,
         directly or indirectly sell, offer, pledge, contract to sell or grant
         any option to purchase or otherwise dispose of or transfer any shares
         of Common Stock, or securities convertible into or exchangeable or
         exercisable for Common Stock, including without limitation, options,
         warrants, convertible bonds and the like, or, in the case of the
         Company, permit the registration under the Act of any shares of Common
         Stock, except for the registration of the Shares and the sales to the
         Underwriters pursuant to this Agreement and except for grants of
         options or issuances of Common Stock upon the exercise of outstanding
         options pursuant to any of the Company's stock option plans existing as
         of the date hereof, for a period of 90 days after the date of the
         Prospectus, without the prior written consent of Banc of America
         Securities LLC (which consent shall not be unreasonably withheld).

                  7. Reimbursement of Underwriters' Expenses. If the Shares are
not delivered for any reason other than the termination of this Agreement
pursuant to the second paragraph of Section 9 hereof or the default by one or
more of the Underwriters in its or their respective obligations hereunder, the
Company and the Selling Stockholder shall reimburse the Underwriters for all of
their out-of-pocket expenses, including the fees and disbursements of their
counsel.

                  8. Conditions of Underwriters' Obligations. The several
obligations of the Underwriters hereunder are subject to the accuracy of the
representations and warranties on the part of the Company and the Selling
Stockholder on the date hereof and at the time of purchase (and the several
obligations of the Underwriters at the additional time of purchase are subject
to the accuracy of the representations and warranties on the part of the Company
and the Selling Stockholder on the date hereof and at the time of purchase
(unless previously waived) and at the additional time of purchase, as the case
may be), the performance by the Company and the Selling Stockholder of their
obligations hereunder and to the following conditions:

                  (a) The Company shall furnish to you at the time of purchase
         and at the additional time of purchase, as the case may be, an opinion
         of Winston & Strawn, counsel for the Company, addressed to the
         Underwriters, and dated the time of purchase or the additional time of
         purchase, as the case may be, with reproduced copies for each of the
         other Underwriters and in form satis-
<PAGE>   18
                                      -17-


         factory to Cahill Gordon & Reindel, counsel for the Underwriters,
         stating that:

                           (i) the Company has been duly incorporated and is
                  validly existing as a corporation in good standing under the
                  laws of the State of New York, with full corporate power and
                  authority to own its properties and conduct its business as
                  described in the Registration Statement and the Prospectus, to
                  execute and deliver this Agreement and to issue, sell and
                  deliver the Shares being sold by it as herein contemplated;

                           (ii) each of the Subsidiaries has been duly
                  incorporated and is validly existing as a corporation in good
                  standing under the laws of its respective jurisdiction of
                  incorporation with full corporate power and authority to own
                  its respective properties and to conduct its respective
                  business;

                           (iii) the Company and its Subsidiaries are duly
                  qualified, licensed and in good standing in each jurisdiction
                  in which they conduct their respective businesses and in which
                  the failure, individually or in the aggregate, to be so
                  licensed or qualified could have a Material Adverse Effect;

                           (iv) each of this Agreement and the Custody Agreement
                  has been duly authorized, executed and delivered by the
                  Company;

                           (v) the Shares being sold by the Company, when issued
                  and delivered to and paid for by the Underwriters, will be
                  duly and validly authorized and issued and will be fully paid
                  and non-assessable;

                           (vi) the Company has an authorized capitalization as
                  set forth in the Registration Statement and the Prospectus;
                  the outstanding shares of capital stock of the Company have
                  been duly and validly authorized and issued, and are fully
                  paid, nonassessable and free of statutory and contractual
                  preemptive rights; the Shares being sold by the Company when
                  issued will be free of statutory and contractual preemptive
                  rights; the certificates for the Shares are in due and proper
                  form and the holders of the Shares will not be subject to
                  personal liability by reason of being such holders;
<PAGE>   19
                                      -18-


                           (vii) the capital stock of the Company, including the
                  Shares, conforms in all material respects to the description
                  thereof contained in the Registration Statement and
                  Prospectus;

                           (viii) the Registration Statement and the Prospectus
                  (except as to the financial statements and schedules and other
                  financial and statistical data contained or incorporated by
                  reference therein, as to which such counsel need express no
                  opinion) comply as to form in all material respects with the
                  requirements of the Act;

                           (ix) the Registration Statement has become effective
                  under the Act and, to the best of such counsel's knowledge, no
                  stop order proceedings with respect thereto are pending or
                  threatened under the Act;

                           (x) no approval, authorization, consent or order of
                  or filing with any federal, state or local governmental or
                  regulatory commission, board, body, authority or agency is
                  required in connection with the issuance and sale of the
                  Shares as contemplated hereby other than registration of the
                  Shares under the Act (except such counsel need express no
                  opinion as to any necessary qualification under the state
                  securities or blue sky laws of the various jurisdictions in
                  which the Shares are being offered by the Underwriters);

                           (xi) the execution, delivery and performance of this
                  Agreement and the Custody Agreement by the Company and the
                  consummation by the Company of the transactions contemplated
                  hereby and thereby do not and will not conflict with, or
                  result in any breach of, or constitute a default under (nor
                  constitute any event which with notice or lapse of time, or
                  both, would constitute a breach of or default under), any
                  provisions of the charter or by-laws of the Company or any of
                  its Subsidiaries or under any provision of any indenture,
                  mortgage, deed of trust, bank loan, credit agreement or other
                  agreement or instrument known to such counsel to which the
                  Company or any of its Subsidiaries is a party or by which any
                  of them or their respective properties may be bound or
                  affected, or under any law, regulation or rule or any
<PAGE>   20
                                      -19-


                  decree, judgment or order applicable to the Company or any of
                  its Subsidiaries;

                           (xii) to the best of such counsel's knowledge,
                  neither the Company nor any of its Subsidiaries is in breach
                  of, or in default under (nor has any event occurred which with
                  notice or lapse of time, or both would constitute a breach of,
                  or default under), any indenture, mortgage, deed of trust,
                  bank loan or any other agreement or instrument to which the
                  Company or any of its Subsidiaries is a party or by which any
                  of them or their respective properties may be bound or
                  affected or under any law, regulation or rule or any decree,
                  judgment or order applicable to the Company or any of its
                  Subsidiaries;

                           (xiii) to the best of such counsel's knowledge, there
                  are no contracts, licenses, agreements, leases or documents of
                  a character which are required to be filed as exhibits to the
                  Registration Statement or to be summarized or described in the
                  Prospectus which have not been so filed, summarized or
                  described;

                           (xiv) to the best of such counsel's knowledge, there
                  are no actions, suits or proceedings pending or threatened
                  against the Company or any of its Subsidiaries or any of their
                  respective properties, at law or in equity or before or by any
                  commission, board, body, authority or agency which are
                  required to be described in the Prospectus but are not so
                  described;

                           (xv) the documents incorporated by reference in the
                  Registration Statement and Prospectus, when they were filed
                  (or, if an amendment with respect to any such document was
                  filed when such amendment was filed), complied as to form in
                  all material respects with the Exchange Act (except as to the
                  financial statements and schedules and other financial and
                  statistical data contained or incorporated by reference
                  therein as to which such counsel need express no opinion);

                           (xvi) the Shares being sold by the Company comply
                  with the additional listing requirements of the New York Stock
                  Exchange and have been approved for such additional listing
                  with the New York Stock Exchange subject only to notice of
                  issuance at or prior to the time of purchase; and
<PAGE>   21
                                      -20-


                           (xvii) the Company is not an entity required to
                  register as an "investment company" under the Investment
                  Company Act, nor is the Company a holding company or a
                  subsidiary of a holding company under the Public Utility
                  Holding Company Act of 1935.

                           In addition, such counsel shall state that such
                  counsel have participated in conferences with officers and
                  other representatives of the Company, representatives of the
                  Selling Stockholder, representatives of the independent public
                  accountants of the Company and representatives of the
                  Underwriters at which the contents of the Registration
                  Statement and Prospectus were discussed and, although such
                  counsel is not passing upon and does not assume responsibility
                  for the accuracy, completeness or fairness of the statements
                  contained in the Registration Statement or Prospectus (except
                  as and to the extent stated in subparagraphs (vi) and (vii)
                  above), on the basis of the foregoing (relying as to
                  materiality to a large extent upon the opinions of officers
                  and other representatives of the Company) nothing has come to
                  the attention of such counsel that causes them to believe that
                  the Registration Statement or any amendment thereto at the
                  time such Registration Statement or amendment became effective
                  contained an untrue statement of a material fact or omitted to
                  state a material fact required to be stated therein or
                  necessary to make the statements therein not misleading, or
                  that the Prospectus or any supplement thereto at the date of
                  such Prospectus or such supplement, and at all times up to and
                  including the time of purchase contained an untrue statement
                  of a material fact or omitted to state a material fact
                  required to be stated therein or necessary to make the
                  statements therein, in light of the circumstances under which
                  they were made, not misleading (it being understood that such
                  counsel need express no opinion with respect to the financial
                  statements and schedules and other financial and statistical
                  data included in the Registration Statement or Prospectus).

                  (b) The Selling Stockholder shall furnish to you at the time
         of purchase and at the additional time of purchase, as the case may be,
         an opinion of LeBoeuf, Lamb, Greene & MacRae, L.L.P., counsel for the
         Selling Stockholder, addressed to the Underwriters, and dated the time
         of purchase or the additional time of pur-


<PAGE>   22
                                      -21-


         chase, as the case may be, with reproduced copies for each of the other
         Underwriters, and in form and substance satisfactory to Cahill Gordon &
         Reindel, counsel for the Underwriters, stating that:

                           (i) each of this Agreement, the Custody Agreement and
                  the Power of Attorney has been duly executed and delivered by
                  or on behalf of the Selling Stockholder;

                           (ii) the Selling Stockholder has all requisite
                  corporate power, and has obtained any authorization or
                  approval required by law (other than those imposed by the Act
                  and the state securities or blue sky laws of the various
                  jurisdictions in which the Shares are being offered by the
                  Underwriters), to sell and deliver the Shares to be sold by
                  such Selling Stockholder in the manner provided in this
                  Agreement;

                           (iii) delivery of certificates for the Shares by the
                  Selling Stockholder pursuant hereto will pass valid and
                  marketable title thereto to the Underwriters, free and clear
                  of any claim, lien, encumbrance, security interest, community
                  property right, restriction on transfer or other defect in
                  title;

                           (iv) the Selling Stockholder has duly authorized the
                  execution and delivery of this Agreement, the Custody
                  Agreement and the Power of Attorney and any other document
                  necessary or desirable in connection with the transactions
                  contemplated hereby and the delivery of the Shares; and

                           (v) the Representative of the Selling Stockholder has
                  been duly authorized by the Selling Stockholder to execute and
                  deliver on behalf of such Selling Stockholder this Agreement
                  and any other document necessary or desirable in connection
                  with the transactions contemplated hereby and to deliver the
                  Shares to be sold by such Selling Stockholder.

                  (c) You shall have received from Deloitte & Touche LLP,
         letters dated, respectively, the date of this Agreement and the time of
         purchase and additional time of purchase, as the case may be, and
         addressed to the Underwriters (with reproduced copies for each of the
         Underwriters) in the forms heretofore approved by you.
<PAGE>   23
                                      -22-


                  (d) You shall have received at the time of purchase and at the
         additional time of purchase, as the case may be, the favorable opinion
         of Cahill Gordon & Reindel, counsel for the Underwriters, dated the
         time of purchase or the additional time of purchase, as the case may
         be, as to the matters referred to in subparagraphs (vii), (viii) and
         (ix) of paragraph (a) of this Section 8.

                  In addition, such counsel shall state that such counsel have
         participated in conferences with officers and other representatives of
         the Company, counsel for the Company, representatives of the Selling
         Stockholder, representatives of the independent public accountants of
         the Company and representatives of the Underwriters at which the
         contents of the Registration Statement and Prospectus and related
         matters were discussed and, although such counsel is not passing upon
         and does not assume any responsibility for the accuracy, completeness
         or fairness of the statements contained in the Registration Statement
         and Prospectus (except as to matters referred to under subparagraph
         (vii) of paragraph (a) of this Section 8), on the basis of the
         foregoing (relying as to materiality to a large extent upon the
         opinions of officers and other representatives of the Company), no
         facts have come to the attention of such counsel which lead them to
         believe that the Registration Statement or any amendment thereto at the
         time such Registration Statement or amendment became effective
         contained an untrue statement of a material fact or omitted to state a
         material fact required to be stated therein or necessary to make the
         statements therein not misleading or that the Prospectus as of its date
         or any supplement thereto as of its date contained an untrue statement
         of a material fact or omitted to state a material fact required to be
         stated therein or necessary to make the statements therein, in light of
         the circumstances under which they were made, not misleading (it being
         understood that such counsel need express no comment with respect to
         the financial statements and schedules and other financial and
         statistical data included in the Registration Statement or Prospectus).

                  (e) You shall have received at the time of purchase and at the
         additional time of purchase, as the case may be, an opinion of Martin
         Zeiger, Esq., Senior Vice President Strategic Business Development and
         General Counsel of the Company, addressed to the Underwriters, and
         dated the time of purchase or the addi-
<PAGE>   24
                                      -23-


         tional time of purchase, as the case may be, with reproduced copies
         for each of the other Underwriters, and in form and substance
         satisfactory to Cahill Gordon & Reindel, counsel for the Underwriters,
         stating that:

                           (i) the execution, delivery and performance of this
                  Agreement and the Custody Agreement by the Company and the
                  consummation by the Company of the transactions contemplated
                  hereby and thereby do not and will not conflict with, or
                  result in any breach of, or constitute a default under (nor
                  constitute any event which with notice, lapse of time, or
                  both, would constitute a breach of or default under), any
                  provisions of the charter or by-laws of the Company or any of
                  its Subsidiaries or under any provision of any license to
                  which the Company or any of its Subsidiaries is a party or by
                  which any of them or their respective properties may be bound
                  or affected, or under any law, regulation or rule or any
                  decree, judgment or order applicable to the Company or any of
                  its Subsidiaries; and

                           (ii) to the best of such counsel's knowledge, neither
                  the Company nor any of its Subsidiaries is in breach of, or in
                  default under (nor has any event occurred which with notice,
                  lapse of time, or both would constitute a breach of, or
                  default under), any license to which the Company or any of its
                  Subsidiaries is a party or by which any of them or their
                  respective properties may be bound or affected or under any
                  law, regulation or rule or any decree, judgment or order
                  applicable to the Company or any of its Subsidiaries.

                  In addition, such counsel shall state that such counsel has
         participated in conferences with officers and other representatives of
         the Company, counsel for the Company, representatives of the Selling
         Stockholder, representatives of the independent public accountants of
         the Company and representatives of the Underwriters at which the
         contents of the Registration Statement and Prospectus were discussed
         and, although such counsel is not passing upon and does not assume
         responsibility for the accuracy, completeness or fairness of the
         statements contained in the Registration Statement or Prospectus, on
         the basis of the foregoing (relying as to materiality to a large extent
         upon the opinions of officers and other representatives of the Company)
         nothing has come to the attention of such
<PAGE>   25
                                      -24-


         counsel that causes him to believe that the Registration Statement or
         any amendment thereto at the time such Registration Statement or
         amendment became effective contained an untrue statement of a material
         fact or omitted to state a material fact required to be stated therein
         or necessary to make the statements therein not misleading, or that the
         Prospectus or any supplement thereto at the date of such Prospectus or
         such supplement, and at all times up to and including the time of
         purchase or additional time of purchase, as the case may be, contained
         an untrue statement of a material fact or omitted to state a material
         fact required to be stated therein or necessary to make the statements
         therein, in light of the circumstances under which they were made, not
         misleading (it being understood that such counsel need express no
         opinion with respect to the financial statements and schedules and
         other financial and statistical data included in the Registration
         Statement or Prospectus).

                  (f) You shall have received at the time of purchase and at the
         additional time of purchase, as the case may be, an opinion of Winston
         & Strawn, special regulatory counsel for the Company, addressed to the
         Underwriters, and dated the time of purchase or the additional time of
         purchase, as the case may be, with reproduced copies for each of the
         other Underwriters, and in form and substance satisfactory to Cahill
         Gordon & Reindel, counsel for the Underwriters, stating that:

                           (i) the descriptions in the Registration Statement
                  and in the Prospectus of the statutes, regulations and legal
                  or governmental proceedings or procedures relating to the
                  United States Food and Drug Administration or the Drug
                  Enforcement Administration and the approval process relating
                  to the Company's products are accurate in all material
                  respects and are a fair summary of those statutes,
                  regulations, proceedings or procedures; and

                           (ii) nothing has come to the attention of such
                  counsel that leads such counsel to believe that descriptions
                  of federal laws, regulations or rules relating to the
                  manufacture or sale of the Company's products and the approval
                  process relating thereto contained in the Registration
                  Statement and in the Prospectus or the documents incorporated
                  by reference therein including, without limitation, the
                  portions of the Prospectus entitled "Risk Factors -- We Are
<PAGE>   26
                                      -25-


                  Subject to Administrative Proceedings Relating to Patent
                  Litigation Settlements which, if Adversely Determined, Would
                  Harm Our Business and Financial Results," "Risk Factors -- We
                  Operate in a Highly Regulated Industry," "Risk Factors --
                  Proposed FDA Regulations and Recent FDA Guidelines May Impair
                  Our Ability to Utilize the 180-Day Marketing Exclusivity
                  Period for Our Successful Patent Challenges," "Business --
                  Patent Challenges," "Business -- Government Regulation," and
                  "Business -- Legal Proceedings" and the portions of the Form
                  10-K of the Company dated June 30, 2000 entitled "Business --
                  Overview -- Patent Challenges," "Business -- Government
                  Regulation" and "Legal Proceedings" contain an untrue
                  statement of a material fact or omit to state a material fact
                  required to be stated therein or necessary to make the
                  statements therein not misleading.

                  (g) No amendment or supplement to the Registration Statement
         or Prospectus, including documents deemed to be incorporated by
         reference therein, shall be filed prior to the time the Registration
         Statement becomes effective to which you object in writing.

                  (h) The Registration Statement shall become effective, or if
         Rule 430A under the Act is used, the Prospectus shall have been filed
         with the Commission pursuant to Rule 424(b) under the Act, at or before
         5:00 P.M., New York City time, on the date of this Agreement, unless a
         later time (but not later than 5:00 P.M., New York City time, on the
         second full business day after the date of this Agreement) shall be
         agreed to by the Company, the Representative of the Selling Stockholder
         and you in writing or by telephone, confirmed in writing; provided,
         however, that the Company, the Representative of the Selling
         Stockholder and you and any group of Underwriters, including you, who
         have agreed hereunder to purchase in the aggregate at least 50% of the
         Firm Shares may from time to time agree on a later date.

                  (i) Prior to the time of purchase or the additional time of
         purchase, as the case may be, (i) no stop order with respect to the
         effectiveness of the Registration Statement shall have been issued
         under the Act or proceedings initiated under Section 8(d) or 8(e) of
         the Act; (ii) the Registration Statement and all
<PAGE>   27
                                      -26-


         amendments thereto, or modifications thereof, if any, shall not contain
         an untrue statement of a material fact or omit to state a material fact
         required to be stated therein or necessary to make the statements
         therein not misleading; and (iii) the Prospectus and all amendments or
         supplements thereto, or modifications thereof, if any, shall not
         contain an untrue statement of a material fact or omit to state a
         material fact required to be stated therein or necessary to make the
         statements therein, in the light of the circumstances under which they
         are made, not misleading.

                  (j) Between the time of execution of this Agreement and the
         time of purchase or the additional time of purchase, as the case may
         be, (i) no material adverse change, financial or otherwise (other than
         as referred to in the Registration Statement and Prospectus), in the
         business, condition or prospects of the Company and its Subsidiaries
         taken as a whole shall occur or become known and (ii) no transaction
         which could reasonably be expected to have a Material Adverse Effect
         has been entered into by the Company or any of its Subsidiaries.

                  (k) The Company will, at the time of purchase or additional
         time of purchase, as the case may be, deliver to you a certificate
         executed by its chief executive officer and its chief financial officer
         to the effect that the representations and warranties of the Company as
         set forth in this Agreement and the conditions set forth in paragraph
         (i) and paragraph (j) have been met and that they are true and correct
         as of each such date.

                  (l) You shall have received signed letters, dated the date of
         this Agreement, from the Selling Stockholder and each of the directors
         and executive officers of the Company and certain of its other
         stockholders to the effect that such persons shall not directly or
         indirectly sell, offer, pledge, contract to sell or grant any option to
         purchase or otherwise dispose of or transfer any shares of Common
         Stock, or securities convertible into or exchangeable or exercisable
         for Common Stock, including without limitation, options, warrants,
         convertible bonds and the like for a period of 90 days after the date
         of the Prospectus without the prior written consent of Banc of America
         Securities LLC (which consent shall not be unreasonably withheld).
<PAGE>   28
                                      -27-


                  (m) The Company and the Selling Stockholder shall have
         furnished to you such other documents and certificates as to the
         accuracy and completeness of any statement in the Registration
         Statement and the Prospectus as of the time of purchase and the
         additional time of purchase, as the case may be, as you may reasonably
         request.

                  (n) The Company and the Selling Stockholder shall perform such
         of their respective obligations under this Agreement as are to be
         performed by the terms hereof at or before the time of purchase and at
         or before the additional time of purchase, as the case may be.

                  (o) The Shares shall have been approved for listing on the New
         York Stock Exchange, subject only to notice of issuance at or prior to
         the time of purchase.

                  (p) The Selling Stockholder will at the time of purchase and
         the additional time of purchase, as the case may be, deliver to you a
         certificate of the Representative of the Selling Stockholder to the
         effect that the representations and the warranties of the Selling
         Stockholder as set forth in this Agreement are true and correct as of
         each such date.

                  (q) Between the time of execution of this Agreement and the
         time of purchase or additional time of purchase, as the case may be,
         there shall not have occurred any downgrading, nor shall any notice
         have been given of (i) any intended or potential downgrading or (ii)
         any review or possible change that does not indicate an improvement, in
         the rating accorded any securities of or guaranteed by the Company or
         any Subsidiary of the Company by any "nationally recognized statistical
         rating organization," as that term is defined in Rule 436(g)(2)
         promulgated under the Act.

                  9. Effective Date of Agreement; Termination. This Agreement
shall become effective (i) if Rule 430A under the Act is not used, when you
shall have received notification of the effectiveness of the Registration
Statement, or (ii) if Rule 430A under the Act is used, when the parties hereto
have executed and delivered this Agreement.

                  The obligations of the several Underwriters hereunder shall be
subject to termination in the absolute discretion of you or any group of
Underwriters (which may include you) which
<PAGE>   29
                                      -28-


has agreed to purchase in the aggregate at least 50% of the Firm Shares, if,
since the time of execution of this Agreement or the respective dates as of
which information is given in the Registration Statement and Prospectus, (y)
there has been any material adverse change, financial or otherwise (other than
as referred to in the Registration Statement and Prospectus), in the business,
condition or prospects of the Company and its Subsidiaries taken as a whole,
which would, in your judgment or in the judgment of such group of Underwriters,
make it impracticable to market the Shares, or (z) there shall have occurred any
downgrading, or any notice shall have been given of (i) any intended or
potential downgrading or (ii) any review or possible change that does not
indicate an improvement, in the rating accorded any securities of or guaranteed
by the Company or any Subsidiary of the Company by any "nationally recognized
statistical rating organization," as that term is defined in Rule 436(g)(2)
promulgated under the Act or, if, at any time prior to the time of purchase or,
with respect to the purchase of any Additional Shares, the additional time of
purchase, as the case may be, trading in securities on the New York Stock
Exchange shall have been suspended or minimum prices shall have been established
on the New York Stock Exchange, or if a banking moratorium shall have been
declared either by the United States or New York State authorities, or if the
United States shall have declared war in accordance with its constitutional
processes or there shall have occurred any material outbreak or escalation of
hostilities or other national or international calamity or crisis of such
magnitude in its effect on the financial markets of the United States as, in
your judgment or in the judgment of such group of Underwriters, to make it
impracticable to market the Shares.

                  If you or any group of Underwriters elects to terminate this
Agreement as provided in this Section 9, the Company, the Representative of the
Selling Stockholder and each other Underwriter shall be notified promptly by
letter or telegram.

                  If the sale to the Underwriters of the Shares, as contemplated
by this Agreement, is not carried out by the Underwriters for any reason
permitted under this Agreement or if such sale is not carried out because the
Company or the Selling Stockholder, as the case may be, shall be unable to
comply with any of the terms of this Agreement, the Company or the Selling
Stockholder, as the case may be, shall not be under any obligation or liability
under this Agreement (except to the extent provided in Sections 6(a), 7 and 11
hereof), and the Underwriters shall be under no obligation or liability to the
Company and the Selling Stockholder under this Agreement (except to the
<PAGE>   30
                                      -29-


extent provided in Section 11 hereof) or to one another hereunder.

                  10. Increase in Underwriters' Commitments. If any Underwriter
shall default in its obligation to take up and pay for the Firm Shares to be
purchased by it hereunder and if the number of Firm Shares which all
Underwriters so defaulting shall have agreed but failed to take up and pay for
does not exceed 10% of the total number of Firm Shares, the non-defaulting
Underwriters shall take up and pay for (in addition to the aggregate amount of
Firm Shares they are obligated to purchase pursuant to Section 1 hereof) the
number of Firm Shares agreed to be purchased by all such defaulting
Underwriters, as hereinafter provided. Such Shares shall be taken up and paid
for by such non-defaulting Underwriter or Underwriters in such amount or amounts
as you may designate with the consent of each Underwriter so designated or, in
the event no such designation is made, such Shares shall be taken up and paid
for by all non-defaulting Underwriters pro rata in proportion to the aggregate
number of Firm Shares set opposite the names of such non-defaulting Underwriters
in Schedule A.

                  Without relieving any defaulting Underwriter from its
obligations hereunder, the Company and the Selling Stockholder agree with the
non-defaulting Underwriters that they will not sell any Firm Shares hereunder
unless all of the Firm Shares are purchased by the Underwriters (or by
substituted Underwriters selected by you with the approval of the Company or
selected by the Company with your approval).

                  If a new Underwriter or Underwriters are substituted by the
Underwriters or by the Company for a defaulting Underwriter or Underwriters in
accordance with the foregoing provision, the Company or you shall have the right
to postpone the time of purchase for a period not exceeding five business days
in order that any necessary changes in the Registration Statement and Prospectus
and other documents may be effected.

                  The term Underwriter as used in this agreement shall refer to
and include any Underwriter substituted under this Section 10 with like effect
as if such substituted Underwriter had originally been named in Schedule A.

                  11. Indemnity by the Company, the Selling Stockholder and the
Underwriters.

                  (a) The Company and the Selling Stockholder jointly and
severally agree to indemnify, defend and hold
<PAGE>   31
                                      -30-


harmless each Underwriter, its directors and officers, and any person who
controls any Underwriter within the meaning of Section 15 of the Act or Section
20 of the Exchange Act, from and against any loss, expense, liability or claim
(including the reasonable cost of investigation) which, jointly or severally,
any such Underwriter or any such person may incur under the Act, the Exchange
Act or otherwise insofar as such loss, expense, liability or claim arises out of
or is based upon any untrue statement or alleged untrue statement of a material
fact contained in the Registration Statement (or in the Registration Statement
as amended by any post-effective amendment thereof by the Company) or in a
Prospectus (the term Prospectus for the purpose of this Section 11 being deemed
to include any Preliminary Prospectus, the Prospectus and the Prospectus as
amended or supplemented by the Company), or arises out of or is based upon any
omission or alleged omission to state a material fact required to be stated in
either such Registration Statement or Prospectus or necessary to make the
statements made therein not misleading, except insofar as any such loss,
expense, liability or claim arises out of or is based upon any untrue statement
or alleged untrue statement of a material fact contained in and in conformity
with information furnished in writing by any Underwriter through you to the
Company expressly for use with reference to such Underwriter in such
Registration Statement or such Prospectus or arises out of or is based upon any
omission or alleged omission to state a material fact in connection with such
information required to be stated in either such Registration Statement or
Prospectus or necessary to make such information not misleading, provided,
however, that the indemnity agreement contained in this subsection (a) with
respect to any Preliminary Prospectus or amended Preliminary Prospectus shall
not inure to the benefit of any Underwriter (or to the benefit of any person
controlling such Underwriter) from whom the person asserting any such loss,
expense, liability or claim purchased the Shares which are the subject thereof
if the Prospectus corrected any such alleged untrue statement or omission and if
such Underwriter failed to send or give a copy of the Prospectus to such person
at or prior to the written confirmation of the sale of such Shares to such
person; provided, further, that the Selling Stockholder shall not be
responsible, either pursuant to this indemnity or as a result of any breach of
this Agreement, for losses, expenses, liability or claims for an amount in
excess of the proceeds to be received by such Selling Stockholder (before
deducting expenses) from the sale of Shares hereunder.
<PAGE>   32
                                      -31-


                  If any action is brought against an Underwriter or any such
person in respect of which indemnity may be sought against the Company or the
Selling Stockholder pursuant to the foregoing paragraph, such Underwriter or
such person shall promptly notify the Company and the Representative of the
Selling Stockholder in writing of the institution of such action and the Company
or the Selling Stockholder, as the case may be, shall assume the defense of such
action, including the employment of counsel reasonably satisfactory to such
indemnified party and payment of all fees and expenses, provided, however, that
the omission to so notify the Company or the Representative of the Selling
Stockholder shall not relieve the Company or the Selling Stockholder from any
liability which they may have to any Underwriter or any such person or
otherwise. Such Underwriter or such controlling person shall have the right to
employ its or their own counsel in any such case, but the fees and expenses of
such counsel shall be at the expense of such Underwriter or of such person
unless the employment of such counsel shall have been authorized in writing by
the Company or such Selling Stockholder in connection with the defense of such
action or the Company or such Selling Stockholder shall not have employed
counsel to have charge of the defense of such action or such indemnified party
or parties shall have reasonably concluded that there may be defenses available
to it or them which are different from or additional to those available to the
Company or such Selling Stockholder (in which case the Company or such Selling
Stockholder shall not have the right to direct the defense of such action on
behalf of the indemnified party or parties), in any of which events such fees
and expenses shall be borne by the Company or such Selling Stockholder, as the
case may be, and paid as incurred (it being understood, however, that the
Company or such Selling Stockholder shall not be liable for the expenses of more
than one separate counsel in any one action or series of related actions in the
same jurisdiction representing the indemnified parties who are parties to such
action). The Company or such Selling Stockholder shall not be liable for any
settlement of any such claim or action effected without its written consent but
if settled with the written consent of the Company or such Selling Stockholder,
the Company or such Selling Stockholder agrees to indemnify and hold harmless
any Underwriter and any such person from and against any loss or liability by
reason of such settlement. Notwithstanding the foregoing sentence, if at any
time an indemnified party shall have requested an indemnifying party to
reimburse the indemnified party for fees and expenses of counsel as contemplated
by the second sentence of this paragraph, then the indemnifying party agrees
that it shall be liable for any settlement of any proceeding effected without
its
<PAGE>   33
                                      -32-


written consent if (i) such settlement is entered into more than 60 business
days after receipt by such indemnifying party of the aforesaid request, (ii)
such indemnifying party shall not have reimbursed the indemnified party in
accordance with such request prior to the date of such settlement and (iii) such
indemnified party shall have given the indemnifying party at least 30 days'
prior notice of its intention to settle. No indemnifying party shall, without
the prior written consent of the indemnified party, effect any settlement of any
pending or threatened proceeding in respect of which any indemnified party is or
could have been a party and indemnity could have been sought hereunder by such
indemnified party, unless such settlement includes an unconditional release of
such indemnified party from all liability on claims that are the subject matter
of such proceeding.

                  (b) Each Underwriter agrees, severally and not jointly, to
indemnify, defend and hold harmless the Company, its directors and officers, the
Selling Stockholder and any person who controls the Company or the Selling
Stockholder within the meaning of Section 15 of the Act or Section 20 of the
Exchange Act from and against any loss, expense, liability or claim (including
the reasonable cost of investigation) which, jointly or severally, the Company,
the Selling Stockholder or any such person may incur under the Act or otherwise,
insofar as such loss, expense, liability or claim arises out of or is based upon
any untrue statement or alleged untrue statement of a material fact contained in
and in conformity with information furnished in writing by or on behalf of such
Underwriter through you to the Company expressly for use with reference to such
Underwriter in the Registration Statement (or in the Registration Statement as
amended by any post-effective amendment thereof by the Company) or in a
Prospectus, or arises out of or is based upon any omission or alleged omission
to state a material fact in connection with such information required to be
stated either in such Registration Statement or Prospectus or necessary to make
such information not misleading. Each of the Company and the Selling Stockholder
hereby acknowledges that the only information that the Underwriters have
furnished to the Company expressly for use in such Registration Statement or
Prospectus are the statements set forth (i) as the last paragraph under the
caption "Underwriting" in the Prospectus concerning stabilization by the
Underwriters and (ii) in the table in the first paragraph under the caption
"Underwriting" in the Prospectus; and the Underwriters confirm that such
statements are correct.
<PAGE>   34
                                      -33-


                  If any action is brought against the Company, the Selling
Stockholder or any such person in respect of which indemnity may be sought
against any Underwriter pursuant to the foregoing paragraph, the Company, the
Selling Stockholder or such person shall promptly notify such Underwriter in
writing of the institution of such action and such Underwriter shall assume the
defense of such action, including the employment of counsel reasonably
satisfactory to such indemnified party and payment of all fees and expenses,
provided, however, that the omission to so notify such Underwriter shall not
relieve such Underwriter, from any liability which they may have to the Company,
the Selling Stockholder or any such person or otherwise. The Company, the
Selling Stockholder or such person shall have the right to employ its own
counsel in any such case, but the fees and expenses of such counsel shall be at
the expense of the Company, the Selling Stockholder or such person unless the
employment of such counsel shall have been authorized in writing by such
Underwriter in connection with the defense of such action or such Underwriter
shall not have employed counsel to have charge of the defense of such action or
such indemnified party or parties shall have reasonably concluded that there may
be defenses available to it or them which are different from or additional to
those available to such Underwriter (in which case such Underwriter shall not
have the right to direct the defense of such action on behalf of the indemnified
party or parties, but such Underwriter may employ counsel and participate in the
defense thereof but the fees and expenses of such counsel shall be at the
expense of such Underwriter), in any of which events such fees and expenses
shall be borne by such Underwriter and paid as incurred (it being understood,
however, that such Underwriter shall not be liable for the expenses of more than
one separate counsel in any one action or series of related actions in the same
jurisdiction representing the indemnified parties who are parties to such
action). No Underwriter shall be liable for any settlement of any such claim or
action effected without the written consent of such Underwriter but if settled
with the written consent of such Underwriter, such Underwriter agrees to
indemnify and hold harmless the Company, the Selling Stockholder and any such
person from and against any loss or liability by reason of such settlement.
Notwithstanding the foregoing sentence, if at any time an indemnified party
shall have requested an indemnifying party to reimburse the indemnified party
for fees and expenses of counsel as contemplated by the second sentence of this
paragraph, then the indemnifying party agrees that it shall be liable for any
settlement of any proceeding effected without its written consent if (i) such
settlement is entered into more than 60 business days after receipt by such
indemnifying party of the
<PAGE>   35
                                      -34-


aforesaid request, (ii) such indemnifying party shall not have reimbursed the
indemnified party in accordance with such request prior to the date of such
settlement and (iii) such indemnified party shall have given the indemnifying
party at least 30 days' prior notice of its intention to settle. No indemnifying
party shall, without the prior written consent of the indemnified party, effect
any settlement of any pending or threatened proceeding in respect of which any
indemnified party is or could have been a party and indemnity could have been
sought hereunder by such indemnified party, unless such settlement includes an
unconditional release of such indemnified party from all liability on claims
that are the subject matter of such proceeding.

                  (c) If the indemnification provided for in this Section 11 is
unavailable to an indemnified party under subsections (a) and (b) of this
Section 11 in respect of any losses, expenses, liabilities or claims referred to
therein, then each applicable indemnifying party, in lieu of indemnifying such
indemnified party, shall contribute to the amount paid or payable by such
indemnified party as a result of such losses, expenses, liabilities or claims
(i) in such proportion as is appropriate to reflect the relative benefits
received by the Company and the Selling Stockholder on the one hand and the
Underwriters on the other hand from the offering of the Shares or (ii) if the
allocation provided by clause (i) above is not permitted by applicable law, in
such proportion as is appropriate to reflect not only the relative benefits
referred to in clause (i) above but also the relative fault of the Company and
the Selling Stockholder on the one hand and of the Underwriters on the other in
connection with the statements or omissions which resulted in such losses,
expenses, liabilities or claims, as well as any other relevant equitable
considerations. The relative benefits received by the Company and the Selling
Stockholder on the one hand and the Underwriters on the other shall be deemed to
be in the same proportion as the total proceeds from the offering (net of
underwriting discounts and commissions but before deducting expenses) received
by the Company and the Selling Stockholder bear to the total underwriting
discounts and commissions received by the Underwriters. The relative fault of
the Company and the Selling Stockholder on the one hand and of the Underwriters
on the other shall be determined by reference to, among other things, whether
the untrue statement or alleged untrue statement of a material fact or omission
or alleged omission relates to information supplied by the Company, by the
Selling Stockholder or by the Underwriters and the parties' relative intent,
knowl-
<PAGE>   36
                                      -35-


edge, access to information and opportunity to correct or prevent such statement
or omission. The amount paid or payable by a party as a result of the losses,
expenses, liabilities and claims referred to above shall be deemed to include
any legal or other fees or expenses reasonably incurred by such party in
connection with investigating or defending any claim or action.

                  (d) The Company, the Selling Stockholder and the Underwriters
agree that it would not be just and equitable if contribution pursuant to this
Section 11 were determined by pro rata allocation (even if the Underwriters were
treated as one entity for such purpose) or by any other method of allocation
that does not take account of the equitable considerations referred to in
subsection (c) above. Notwithstanding the provisions of this Section 11, no
Underwriter shall be required to contribute any amount in excess of the amount
by which the total price at which the Shares underwritten by such Underwriter
and distributed to the public were offered to the public exceeds the amount of
any damages which such Underwriter has otherwise been required to pay by reason
of such untrue statements or alleged untrue statement or omission or alleged
omission. No person guilty of fraudulent misrepresentation (within the meaning
of Section 11(f) of the Act) shall be entitled to contribution from any person
who was not guilty of such fraudulent misrepresentation. The Underwriters'
obligations to contribute pursuant to this Section 11 are several in proportion
to their respective underwriting commitments and not joint.

                  (e) The indemnity and contribution agreements contained in
this Section 11 and the covenants, warranties and representations of the Company
and the Selling Stockholder contained in this Agreement shall remain in full
force and effect regardless of any investigation made by or on behalf of any
Underwriter, its directors and officers or any person who controls any
Underwriter within the meaning of Section 15 of the Act or Section 20 of the
Exchange Act, or by or on behalf of the Company, its directors and officers, the
Selling Stockholder or any person who controls the Company within the meaning of
Section 15 of the Act or Section 20 of the Exchange Act, and shall survive any
termination of this Agreement or the issuance and delivery of the Shares. The
Company, the Selling Stockholder and each Underwriter agree promptly to notify
the others of the commencement of any litigation or proceeding against it and,
in the case of the Company, against any of the Company's officers and directors
in connection with the issuance and sale
<PAGE>   37
                                      -36-


of the Shares, or in connection with the Registration Statement or Prospectus.

                  12. Notices. Except as otherwise herein provided, all
statements, requests, notices and agreements shall be in writing or by telegram
and, if to the Underwriters, shall be sufficient in all respects if delivered or
sent to Banc of America Securities LLC, 600 Montgomery Street, San Francisco,
California 94111, Attention: Revel Horsey, if to the Company, shall be
sufficient in all respects if delivered or sent to the Company at the offices of
the Company at 2 Quaker Road, Pomona, NY 10970-0519, Attention: General Counsel
and, if to the Selling Stockholder, shall be sufficient in all respects if
delivered or sent to the Representative of the Selling Stockholder at Apotex,
150 Signet Drive, Weston (Toronto), Ontario M9L 1T9, Attention: Chief Financial
Officer.

                  13. Construction. This Agreement shall be governed by, and
construed in accordance with, the internal laws of the State of New York. The
Section headings in this Agreement have been inserted as a matter of convenience
of reference and are not a part of this Agreement.

                  14. Parties at Interest. The Agreement herein set forth has
been and is made solely for the benefit of the Underwriters, the Company, the
Selling Stockholder and the controlling persons, directors and officers referred
to in Section 11 hereof, and their respective successors, assigns, executors and
administrators. No other person, partnership, association or corporation
(including a purchaser, as such purchaser, from any of the Underwriters) shall
acquire or have any right under or by virtue of this Agreement.

                  15. Counterparts. This Agreement may be signed by the parties
in counterparts which together shall constitute one and the same agreement among
the parties.
<PAGE>   38
                                      -37-


                  If the foregoing correctly sets forth the understanding among
the Company, the Selling Stockholder and the Underwriters, please so indicate in
the space provided below for the purpose, whereupon this letter and your
acceptance shall constitute a binding agreement among the Company, the Selling
Stockholder and the Underwriters, severally.

                                          Very truly yours,

                                          BARR LABORATORIES, INC.


                                          By:_________________________________
                                             Name:
                                             Title:

                                          THE SELLING STOCKHOLDER NAMED IN
                                          SCHEDULE B ATTACHED HERETO


                                          By:_________________________________
                                                   Attorney-in-Fact

Accepted and agreed to as of
the date first above written,
on behalf of themselves and
the other several Underwriters
named in Schedule A

BANC OF AMERICA SECURITIES LLC


By:_________________________
   Name:
   Title:
<PAGE>   39
                                   SCHEDULE A



<TABLE>
<CAPTION>
                                                                    Number of
Underwriter                                                        Firm Shares
-----------                                                        -----------
<S>                                                                <C>
Banc of America Securities LLC











                                                                   -----------
Total................................                                3,500,000
                                                                   -----------
</TABLE>
<PAGE>   40
                                   SCHEDULE B


<TABLE>
<CAPTION>
                                                                     Number of
Selling Stockholder                                                 Firm Shares
-------------------                                                 -----------
<S>                                                                 <C>
                                                                     3,000,000







                                                                   -----------
         Total.......................................                3,000,000
                                                                   ===========
</TABLE>


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