DURA PHARMACEUTICALS INC/CA
SC 13D, 1998-01-02
PHARMACEUTICAL PREPARATIONS
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<PAGE>



                          SECURITIES AND EXCHANGE COMMISSION
                                WASHINGTON, D.C. 20549

                                     SCHEDULE 13D
                                    (RULE 13d-101)

         INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO 13d-1(a)
                  AND AMENDMENTS THERETO FILED PURSUANT TO 13d-2(a)

                      UNDER THE SECURITIES EXCHANGE ACT OF 1934



                      SPIROS DEVELOPMENT CORPORATION II, INC.
- - - - --------------------------------------------------------------------------------
                                   (NAME OF ISSUER)


                  CALLABLE COMMON STOCK, PAR VALUE $0.001 PER SHARE
- - - - --------------------------------------------------------------------------------
                            (TITLE OF CLASS OF SECURITIES)


                                     848 936 100
- - - - --------------------------------------------------------------------------------
                                    (CUSIP NUMBER)

                                    CAM L. GARNER
                   CHAIRMAN, PRESIDENT AND CHIEF EXECUTIVE OFFICER
                              DURA PHARMACEUTICALS, INC.
                                 7475 LUSK BOULEVARD
                             SAN DIEGO, CALIFORNIA  92121
                                    (619) 457-2553

- - - - --------------------------------------------------------------------------------
                    (NAME, ADDRESS AND TELEPHONE NUMBER OF PERSON
                  AUTHORIZED TO RECEIVE NOTICES AND COMMUNICATIONS)


                                 DECEMBER 22, 1997
- - - - --------------------------------------------------------------------------------
               (DATE OF EVENT WHICH REQUIRES FILING OF THIS STATEMENT)


     If the filing person has previously filed a statement on Schedule 13G to
report the acquisition which is the subject of this Schedule 13D, and is filing
this schedule because of Rule 13d-1(b)(3) or (4), check the following box / /.



                            (Continued on following pages)


<PAGE>

- - - - --------------------------------------------------------------------------------
CUSIP NO.  848 936 100        13D       Page 2 of 7 Pages
- - - - --------------------------------------------------------------------------------
  1  NAME OF REPORTING PERSON
     S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
     DURA PHARMACEUTICALS, INC.
     IRS Employer Identification No.:  95-3645543
- - - - --------------------------------------------------------------------------------
  2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                 (a) / / (b) / /
- - - - --------------------------------------------------------------------------------
  3  SEC USE ONLY

- - - - --------------------------------------------------------------------------------
  4  SOURCE OF FUNDS*
          OO
- - - - --------------------------------------------------------------------------------
  5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
     PURSUANT TO ITEM 2(d) OR 2(e)                                           / /
- - - - --------------------------------------------------------------------------------
  6  CITIZENSHIP OR PLACE OF ORGANIZATION
          U.S.A.
- - - - --------------------------------------------------------------------------------
                    7    SOLE VOTING POWER
    NUMBER                 6,325,000(1)
      OF         ---------------------------------------------------------------
    SHARES          8    SHARED VOTING POWER
  BENEFICIALLY             0
   OWNED BY      ---------------------------------------------------------------
   REPORTING        9    SOLE DISPOSITIVE POWER
    PERSON                 6,325,000(1)
     WITH        ---------------------------------------------------------------
                    10   SHARED DISPOSITIVE POWER
                           0
- - - - --------------------------------------------------------------------------------
 11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
     PERSON
                      6,325,000(1)
- - - - --------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11 EXCLUDES
     CERTAIN SHARES*
                                                                             / /
- - - - --------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
                      100%
- - - - --------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*
               CO
- - - - --------------------------------------------------------------------------------

                        *SEE INSTRUCTIONS BEFORE FILLING OUT!

(1)       Represents the total number of shares of Callable Common Stock of
Spiros Development Corporation II, Inc. ("SDCII Common Stock") currently
outstanding.  Such shares are currently traded as units, each unit consisting of
one Share of SDCII Common Stock and one warrant to purchase one-fourth of one
share of Common Stock of Dura Pharmaceuticals, Inc. ("Dura").  However, pursuant
to Dura's option, upon exercise Dura shall purchase all of the outstanding
shares of SDCII Common Stock outstanding at the time of exercise of Dura's
option.  As a result, the above reported number of shares of SDCII Common Stock
is subject to change, based upon the total number of SDCII Common Stock
outstanding at the time of exercise.


                                  PAGE 2 OF 7 PAGES
<PAGE>

Item 1.   SECURITY AND ISSUER

     The class of securities to which this Statement relates is the Callable 
Common Stock (the "SDCII Common Stock") of Spiros Development Corporation 
II, Inc., a Delaware corporation, ("SDCII") whose principal executive offices 
are at 7475 Lusk Blvd., San Diego, California 92121.

ITEM 2.   IDENTITY AND BACKGROUND

     Dura Pharmaceuticals, Inc., a Delaware corporation ("Dura") is the party
filing this Statement.  Dura's principal executive offices are located at 7475
Lusk Boulevard, San Diego, CA  92121, and its principal business is the
development and marketing of respiratory pharmaceutical products and the
development of a pulmonary drug delivery system.

     During the last five years, Dura has not been convicted in a criminal
proceeding and has not been a party to a civil proceeding of a judicial or
administrative body of competent jurisdiction which resulted in a judgment,
decree or final order enjoining future violations of, or prohibiting or
mandating activities, subject to, Federal or State securities laws or finding
any violation with respect to such laws.


ITEM 3.   SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION

     If Dura exercises its option to purchase all of the SDCII Common Stock 
(the "Purchase Option" or "Transaction"), the purchase price calculated on a 
per share basis (the "Purchase Option Exercise Price") will be as follows:

IF THE SPIROS CORP. II COMMON STOCK IS ACQUIRED                  PURCHASE OPTION
PURSUANT TO THE PURCHASE OPTION:                                 EXERCISE PRICE
- - - - --------------------------------                                 --------------

Before January 1, 2000 . . . . . . . . . . . . . . . . . . . .         $24.01

On or after January 1, 2000 and on or before March 31, 2000. .          25.26
On or after April 1, 2000 and on or before June 30, 2000 . . .          26.57
On or after July 1, 2000 and on or before September 30, 2000 .          27.96
On or after October 1, 2000 and on or before December 31, 2000          29.41

On or after January 1, 2001 and on or before March 31, 2001. .          31.10
On or after April 1, 2001 and on or before June 30, 2001 . . .          32.88
On or after July 1, 2001 and on or before September 30, 2001 .          34.77
On or after October 1, 2001 and on or before December 31, 2001          36.76

On or after January 1, 2002 and on or before March 31, 2002. .          38.87
On or after April 1, 2002 and on or before June 30, 2002 . . .          41.10
On or after July 1, 2002 and on or before September 30, 2002 .          43.46
On or after October 1, 2002 and on or before December 31, 2002          45.95


     The Purchase Option Exercise Price may be paid in cash or shares of Dura
Common Stock, or any combination of the foregoing, at Dura's sole discretion.
Any such shares of Dura Common Stock will be valued based upon the average of
the closing price for Dura Common Stock on the Nasdaq National Market for ten
trading days immediately preceding the date of the Exercise Notice.  Management
currently expects that any cash payments will be derived from Dura's existing
cash and cash equivalents.


                                  PAGE 3 OF 7 PAGES
<PAGE>

ITEM 4.   PURPOSE OF TRANSACTION

     The purpose of the Transaction is to acquire the rights to all products and
product candidates developed or under development by SDCII pursuant to a certain
Development Agreement dated December 22, 1997 between Dura and SDCII.



ITEM 5.   INTEREST IN SECURITIES OF THE ISSUER

     (a)  Dura beneficially owns an interest in 100% of the SDCII Common Stock
          outstanding at the time of Dura's exercise of the Purchase Option.
          Currently there are 6,325,000 shares of SDCII Common Stock
          outstanding, all of which are currently trading as a component of
          units (the "Units"), each Unit consisting of one share of SDCII
          Common Stock and one warrant (the "Warrants") to purchase
          one-fourth of one share of Dura Common Stock.

     (b)  Upon the closing of the Transaction, Dura shall have sole power to
          vote and dispose of all of the outstanding shares of SDCII Common
          Stock at the time of exercise.  Currently there are 6,325,000 shares
          of SDCII Common Stock outstanding, all of which are trading as Units.

     (c)  Not applicable.

     (d)  No other person is known to have the right to receive or the power to
          direct the receipt of dividends from, or the proceeds from the sale
          of, the securities.

     (e)  Not applicable.


ITEM 6.   CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT
          TO SECURITIES OF THE ISSUER

     Pursuant to SDCII's Amended and Restated Certificate of Incorporation (the
"SDCII Certificate"), Dura, as the holder of all of the issued and outstanding
special shares, par value $1.00 per share, of Spiros Corp. II (the "Special
Shares"), has the right to purchase all, but not less than all, of the SDCII
Common Stock outstanding at the time the Purchase Option is exercised.  The
Purchase Option will be exercisable by notice (the "Exercise Notice") given at
any time beginning on December 22, 1997, the closing of the initial public U.S.
and international offerings of the Units (the "Offerings") and ending on the
earlier of (i) December 31, 2002 or (ii) the 90th day after the date SDCII
provides Dura (as such holder) with quarterly financial statements of SDCII
showing cash or cash equivalents of less than $5 million (the "Financial
Notice"), although, following the receipt of the Financial Notice, Dura may
elect to extend such period by providing additional funding for the continued
development of certain products (the "Spiros Products") (but in no event beyond
December 31, 2002).  If the Purchase Option is exercised, the purchase price
calculated on a per share basis (the "Purchase Option Exercise Price") will be
as follows:


                                  PAGE 4 OF 7 PAGES
<PAGE>
IF THE SPIROS CORP. II COMMON STOCK IS ACQUIRED                  PURCHASE OPTION
PURSUANT TO THE PURCHASE OPTION:                                 EXERCISE PRICE
- - - - --------------------------------                                 --------------

Before January 1, 2000 . . . . . . . . . . . . . . . . . . . .         $24.01

On or after January 1, 2000 and on or before March 31, 2000. .          25.26
On or after April 1, 2000 and on or before June 30, 2000 . . .          26.57
On or after July 1, 2000 and on or before September 30, 2000 .          27.96
On or after October 1, 2000 and on or before December 31, 2000          29.41

On or after January 1, 2001 and on or before March 31, 2001. .          31.10
On or after April 1, 2001 and on or before June 30, 2001 . . .          32.88
On or after July 1, 2001 and on or before September 30, 2001 .          34.77
On or after October 1, 2001 and on or before December 31, 2001          36.76

On or after January 1, 2002 and on or before March 31, 2002. .          38.87
On or after April 1, 2002 and on or before June 30, 2002 . . .          41.10
On or after July 1, 2002 and on or before September 30, 2002 .          43.46
On or after October 1, 2002 and on or before December 31, 2002          45.95


     The Purchase Option Exercise Price may be paid in cash or shares of Dura
Common Stock, or any combination of the foregoing, at Dura's sole discretion.
Any such shares of Dura Common Stock will be valued based upon the average of
the closing price for Dura Common Stock on the Nasdaq National Market for ten
trading days immediately preceding the date of the Exercise Notice.

     Dura owns all of the issued and outstanding Special Shares, which grants
Dura the Purchase Option and confers certain voting and other rights, including
the right to elect two of the five directors of SDCII.  Under SDCII's Amended
and Restated Certificate of Incorporation, SDCII will be prohibited, until the
expiration of the Purchase Option, from taking or permitting certain actions
inconsistent with Dura's rights under the Purchase Option.  For example, until
the expiration of the Purchase Option, SDCII will not be able to, among other
things, without the consent of Dura, pay any dividends, issue additional shares
of capital stock, have outstanding borrowings in excess of an aggregate of $1
million, or merge, liquidate or sell all or substantially all of its assets or
alter the Purchase Option.

     On December 22, 1995 the Offerings closed pursuant to certain underwriting
agreements dated December 16, 1997 by and between SDCII, Dura and the U.S. and
International Underwriters (as hereinafter defined).  The Offerings resulted in
an issuance and sale of 6,325,000 Units (including the Units sold to the
international and U.S. underwriters of the Offerings (the "Underwriters") as a
result of the full exercise of their respective over allotment options) and net
proceeds for SDCII of $94,156,000.  The Units are listed on the Nasdaq National
Market.  The SDCII Common Stock and the Warrants comprising the Units will trade
only as units through December 31, 1999 or such earlier date as the Purchase
Option is exercised or expires unexercised (the "Separation Date").  It is
expected that the SDCII Common Stock and the Warrants will be eligible for
quotation after the Separation Date on the Nasdaq National Market.  There can be
no assurance that there will be an active trading market for the Units or that,
after the Separation Date, there will be active trading markets for the SDCII
Common Stock or the Warrants.  The Dura Common Stock is quoted on the Nasdaq
National Market.


                                  PAGE 5 OF 7 PAGES
<PAGE>

     In accordance with the terms of the SDCII Certificate, the holders of 
the SDCII Common Stock will be obligated to sell such shares to Dura upon 
exercise of the Purchase Option.  These stockholders have no investment 
discretion in connection with Dura's purchase of such outstanding shares of 
SDCII Common Stock, and title to the SDCII Common Stock automatically vests 
in Dura on the closing of the Transaction.

ITEM 7.    MATERIAL TO BE FILED AS EXHIBITS

   99.1    Amended and Restated Certificate of Incorporation of SDCII as filed
           with the Secretary of State of Delaware on December 18, 1997.

   99.2    U.S. Purchase Agreement dated December 16, 1997 by and between Dura,
           SDCII and the U.S. Underwriter.

   99.3    International Purchase Agreement dated December 16, 1997 by and
           between Dura, SDCII and the international Underwriters.


                                  PAGE 6 OF 7 PAGES
<PAGE>

SIGNATURE

     After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.


December 31, 1997             DURA PHARMACEUTICALS, INC.



                              By:  /s/ Mitchell R. Woodbury
                                 -----------------------------------------
                              Title:  Senior Vice President












ATTENTION:     Intentional misstatements or omissions of fact constitute Federal
               criminal violations (SEE 18 U.S.C. 1001).13


                                  PAGE 7 OF 7 PAGES

<PAGE>

                                                                 EXHIBIT 99.(a)

                  AMENDED AND RESTATED CERTIFICATE OF INCORPORATION
                                       OF
                      SPIROS DEVELOPMENT CORPORATION II, INC.


     Spiros Development Corporation II, Inc., a corporation organized and
existing under the laws of the State of Delaware (the "Corporation"), hereby
certifies as follows:

     1.   The name of the Corporation is Spiros Development Corporation II, Inc.
The Corporation's original Certificate of Incorporation was filed with the
Secretary of State of the State of Delaware on September 23, 1997 under the name
of SDC II, Inc., and was amended pursuant to a Certificate of Amendment of
Certificate of Incorporation filed with the Secretary of State of the State of
Delaware on October 8, 1997.  

     2.   Pursuant to Sections 242 and 245 of the General Corporation Law of the
State of Delaware, this Amended and Restated Certificate of Incorporation was
adopted by the Corporation's Board of Directors and its sole stockholder, the
holder of one hundred percent (100%) of the Corporation's capital stock, in
accordance with Section 228 thereof.  The Amended and Restated Certificate of
Incorporation restates, integrates and amends the provisions of the Certificate
of Incorporation of this Corporation.

     3.   The text of the Corporation's Certificate of Incorporation as
heretofore amended is hereby restated and further amended to read in its
entirety as follows:


                                      ARTICLE I

                                         NAME

     The name of the Corporation is Spiros Development Corporation II, Inc. 


                                      ARTICLE II

                        REGISTERED OFFICE AND REGISTERED AGENT

     The address of the Corporation's registered office in the State of Delaware
is 30 Old Rudnick Lane, City of Dover, County of Kent 19901.  The name of its
registered agent at such address is CorpAmerica, Inc. 


<PAGE>

                                     ARTICLE III

                                  CORPORATE PURPOSE

     The purpose of the Corporation is to engage in any lawful act or activity
for which corporations may now or hereafter be organized under the General
Corporation Law of Delaware.


                                    ARTICLE IV

                                   CAPITAL STOCK

     Section 4.1.  AUTHORIZED STOCK.   The Corporation is authorized to issue
two classes of stock, one of which shall be known as Callable Common Stock and
the other of which shall be known as Special Common Stock.  The total number of
shares of all classes of stock the Corporation shall have authority to issue is
7,501,000.  The total number of shares of Callable Common Stock which the
Corporation is authorized to issue is 7,500,000.  The par value of each share of
Callable Common Stock shall be $.001.  The total number of shares of Special
Common Stock which the Corporation is authorized to issue is 1,000.  The par
value of each share of Special Common Stock shall be $1.00.  The authorized and
outstanding shares of the Corporation's capital stock as of the date of this
Amended and Restated Certificate of Incorporation are hereby renamed Special
Common Stock.

     SECTION 4.2.  DIVIDENDS.   Subject to Section 4.4(c) hereof, the holders of
Callable Common Stock are entitled to receive dividends when, as and if declared
by the Board of Directors of the Corporation (the "Board") out of funds legally
available therefore.  No dividends are payable on or with respect to the Special
Common Stock and, other than as set forth in Section 4.3, the holder of Special
Common Stock is not entitled to participate in any way in the profits or assets
of the Corporation.

     SECTION 4.3.  LIQUIDATION.   In the event of the liquidation, dissolution
or winding-up of the Corporation, the holders of Callable Common Stock have
priority over the holder of Special Common Stock with respect to a return of
capital.

     SECTION 4.4.  VOTING RIGHTS OF STOCKHOLDERS.

          (a)  Each holder of Callable Common Stock shall have one vote, either
in person or by proxy, for each share standing in his, her or its name on all
matters submitted to a vote of the stockholders of the Corporation.  The holder
of Special Common Stock shall be entitled to vote only as required by law or as
set forth in this Section 4.4.  In such instances, the holder of Special Common
Stock shall have one vote for each share standing in his, her or its name.  

                                    -2-

<PAGE>

          (b)  In any election of directors of the Corporation, the holder of
Special Common Stock, voting as a separate class, shall be entitled to elect two
directors (each a "Special Common Stock Director").  This right of the holder of
Special Common Stock shall continue until the earliest of (i) the exercise of
the Purchase Option (as defined in Article V), (ii) the Purchase Option
Expiration Date (as defined in Article V) or (iii) the date of termination of
the Purchase Option pursuant to Section 5.10 hereof, at which time such right
shall terminate.

          (c)  The Corporation shall not, without the affirmative vote of the
holder of the then issued and outstanding shares of Special Common Stock, voting
separately as a class, authorize or permit: (i) the allotment or issue of shares
of capital stock of the Corporation or the creation of any right to such an
allotment or issue; (ii) the reduction of the Corporation's authorized capital
stock; (ii) the alteration of or any change to the rights, powers, preferences
and restrictions of the Special Common Stock; (iii) outstanding borrowings of an
aggregate of more than $1 million at any one time; (iv) the sale or other
disposition of or the creation of any lien or liens on the whole or a material
part of the Corporation's business or assets; (v) the declaration or payment of
dividends or the making of any other distributions to the Corporation's
stockholders; (vi) the merger, consolidation or reorganization of the
Corporation with or into any other corporation; (vii) the sale, liquidation or
other disposition of all or substantially all of the assets of the Corporation;
(viii) the alteration or amendment of Articles IV or VII of this Amended and
Restated Certificate of Incorporation; and (ix) the adoption, amendment or
repeal of the Bylaws of the Corporation.  The affirmative vote of a majority of
the issued and outstanding shares of Special Common Stock required by this
Section 4.4(c) shall continue until the earliest of (i) the exercise of the
Purchase Option; (ii) the Purchase Option Expiration Date or (iii) the date of
termination of the Purchase Option pursuant to Section 5.10 hereof, at which
time such requirement shall terminate.

          (d)  No holder of Special Common Stock may transfer or sell less than
all of the shares of Special Common Stock held by such holder.  In the event of
any sale, assignment, delegation or transfer of the Special Common Stock, the
holder thereof shall provide written notice to the record holders of shares of
Callable Common Stock and to the Corporation of any such assignment, delegation,
transfer or sale not later than thirty (30) days after such assignment,
delegation, transfer or sale setting forth the identity and address of the
assignee and summarizing the terms of the assignment, delegation, transfer or
sale.

     SECTION 4.5.  REDEMPTION OF SPECIAL COMMON STOCK.

          (a)  The Corporation may, from time to time on and after the earliest
of (i) the exercise of the Purchase Option, (ii) the Purchase Option Expiration
Date or (iii) the date of termination of the Purchase Option pursuant to Section
5.10 hereof, redeem all of the outstanding shares of Special Common Stock by
paying in cash $1.00 per share on each redeemed share (the "Redemption Price").
At least 15 days before the date of redemption, a written redemption notice (the
"Redemption Notice") shall be given to the holder of Special 

                                      -3-

<PAGE>

Common Stock by first-class mail, postage prepaid, at the holder's address as 
shown on the Corporation's records, stating that: (i) all the shares of 
Special Common Stock are to be redeemed; (ii) the date fixed for redemption 
(the "Redemption Date"); (iii) the Redemption Price; and (iv) the place of 
payment of the Redemption Price.

          (b)  On or before the Redemption Date, the holder of shares of Special
Common Stock to be redeemed shall surrender the certificates representing these
shares to the Corporation at the place designated for payment in the redemption
notice and shall then be entitled to receive payment of the Redemption Price.

          (c)  If the Redemption Notice is given in the manner provided in this
Article IV, and if on the Redemption Date the Redemption Price is available for
payment, whether or not the certificates covering these shares are surrendered,
all rights with respect to the redeemable Special Common Stock shall terminate,
except the right of the holder thereof to receive the Redemption Price without
interest on the surrender of the certificates. 


                                      ARTICLE V

                                STOCK PURCHASE OPTION

    Section 5.1.  TERMS OF OPTION.  

          (a)  The holder of the Special Common Stock has the right to purchase
all, but not less than all, of the issued and outstanding shares of Callable
Common Stock of the Corporation at the time such right is exercised on the terms
and conditions set forth herein (the "Purchase Option").

          (b)  Subject to Section 5.13 hereof, the Purchase Option may be
exercised at any time beginning on the closing date of the underwritten offering
(the "Offering") of units (the "Units"), each Unit consisting of one share of
the Corporation's Callable Common Stock and a warrant to purchase one-fourth of
one share of the common stock of Dura Pharmaceuticals, Inc. ("Dura"), and ending
on the earliest of (i) December 31, 2002, (ii) the 90th day after the date the
Corporation delivers quarterly financial statements of the Corporation to the
holder of the Special Common Stock showing cash or cash equivalents of less than
$5 million (the "Financial Notice"), and (iii) the date of termination by the
Corporation of the Technology License Agreement among the Corporation, Dura,
Spiros Development Corporation and Dura Delivery Systems, Inc. pursuant to
Section 8.4 thereof, the Development Agreement between the Corporation and Dura
pursuant to Section 10.4 thereof or the Manufacturing and Marketing Agreement
between the Corporation and Dura pursuant to Section 9.4 thereof, each such
agreement being dated on or about December 22, 1997 (such date of expiration
being the "Purchase Option Expiration Date"); PROVIDED, that the delivery of
Financial Notice will be deemed not to have occurred with respect to any one

                                      -4-

<PAGE>

or more quarterly financial statements delivered if within 15 days of 
receipt, the Corporation receives a written commitment from the holder of the 
Special Common Stock, in form and substance reasonably satisfactory to a 
majority of the Board members elected by the holders of the Callable Common 
Stock, to make a cash contribution in an amount considered sufficient by the 
Board, and consistent with the budget and workplans then in effect, to allow 
the Corporation to continue research and development under the Development 
Agreement between the Corporation and Dura executed on the date of the 
closing of the Offering, as may be amended from time to time (the 
"Development Agreement"), for at least three months subsequent to such 
quarterly financial statements, and in such case the holder of the Special 
Common Stock funds such cash contribution within fifteen (15) days after such 
written commitment is received by the Corporation.  

          (c)  If the Purchase Option Expiration Date is not a Business Day (as
defined below), then the Purchase Option Expiration Date shall be 11:59 p.m.,
San Diego time, on the next succeeding Business Day.  "Business Day" shall mean
any day, other than a Saturday, Sunday or any other day on which banking
institutions in San Diego, California are authorized or required by law,
regulation or executive order to be closed.  

     SECTION 5.2.  PURCHASE OPTION EXERCISE PRICE.   Upon exercise of the
Purchase Option, the holder of the Special Common Stock shall make a payment for
each outstanding share of Callable Common Stock (the "Purchase Option Exercise
Price") in accordance with the following schedule: 

<TABLE>
<CAPTION>
                                                                    PURCHASE
                                                                      OPTION
IF THE PURCHASE OPTION IS EXERCISED                               EXERCISE PRICE
- - - - -----------------------------------                               ------------

<S>                                                                 <C>
Before January 1, 2000.........................................      $24.01
On or after January 1, 2000 and before March 31, 2000..........      $25.26
On or after April 1, 2000 and before June 30, 2000.............      $26.57
On or after July 1, 2000 and before September 30, 2000.........      $27.96
On or after October 1, 2000 and before December 31, 2000.......      $29.41
On or after January 1, 2001 before March 31, 2001..............      $31.10
On or after April 1, 2001 and before June 30, 2001.............      $32.88
On or after July 1, 2001 and before December 31, 2001..........      $34.77
On or after October 1, 2001 and before December 31, 2001.......      $36.76
On or after January 1, 2002 and before March 31, 2002..........      $38.87
On or after April 1, 2002 and before June 30, 2002.............      $41.10
On or after July 1, 2002 and before September 30, 2002.........      $43.46
On or after October 1, 2002 and before December 31, 2002.......      $45.95
</TABLE>

                                      -5-

<PAGE>

     SECTION 5.3.  FORM OF PAYMENT.

          (a)  If the holder of the Special Common Stock exercises the Purchase
Option, subject to Section 5.6 hereof, the Purchase Option Exercise Price may be
paid in cash, in shares of Dura common stock, or the Common Equity Securities
(as defined below) of the holder of the Special Common Stock, if other than Dura
(provided that such Common Equity Securities must be listed on a national
securities exchange or listed on the Nasdaq National Market), or in any
combination thereof at the sole discretion of the holder of the Special Common
Stock.  The number of shares of Common Equity Securities, if any, to be
delivered in payment of all or a portion of the Purchase Option Exercise Price
shall be determined by dividing the portion of the Purchase Option Exercise
Price to be paid in shares of Common Equity Securities by the average of the
closing prices of such Common Equity Securities on the principal national
securities exchange on which such Common Equity Securities are then traded or,
if not traded on any national securities exchange, the average of the closing
prices of such Common Equity Securities on the Nasdaq National Market (in each
case the "Closing Price") for the ten (10) trading days immediately preceding
the date the holder of the Special Common Stock gives written notice of its
exercise of the Purchase Option as provided in this Article.  No fractional
shares of Common Equity Securities shall be issued in payment of all or a
portion of the Purchase Option Exercise Price.  Instead of any fractional shares
of Common Equity Securities that would otherwise be issuable in payment of all
or a portion of the Option Exercise Price, the holder of the Special Common
Stock shall pay a cash adjustment in respect of such fractional interest in an
amount equal to that fractional interest multiplied by the average of the
Closing Price on each of the ten (10) trading days immediately preceding the
exercise of the Purchase Option.

          (b)  "Common Equity Securities" shall mean, with respect to any
corporation (the "Acquiror"), common stock having the right under ordinary
circumstances to elect a majority of directors of the Acquiror, and that is
registered under the Securities Act and (i) listed on the principal national
securities exchange on which such common stock of the Acquiror is then listed or
(ii) if not listed on national securities exchange, listed on the Nasdaq
National Market if such stock is traded thereon or, if such stock is neither
listed as provided in either (i) or (ii), qualified for inclusion on the Nasdaq
over-the-counter system.

     SECTION 5.4.  MANNER OF EXERCISE. 

          (a)  The holder of the Special Common Stock shall exercise the
Purchase Option by delivery of a Purchase Exercise Notice (as defined in clause
(c) of this Section 5.4) to the Corporation and to each holder of record of
Callable Common Stock on the Record Date (as defined below).  The Purchase
Exercise Notice sent pursuant to this Section 5.4 shall be sent via first class
mail.

                                      -6-

<PAGE>

          (b)  "Record Date" shall mean the record date fixed by the Purchase
Exercise Notice which shall be a date no earlier than 10 days after, and no
later than 20 days after, the date of such notice.

          (c)  The "Purchase Exercise Notice" shall be a written notice signed
by the holder of the Special Common Stock given in accordance with the
provisions of this Article V and stating that such party intends to exercise the
Purchase Option and setting forth: (i) the Purchase Option Exercise Price as
determined in accordance with Section 5.2 hereof; (ii) the portion, if any, of
the Purchase Option Exercise Price to be paid in cash, (iii) the portion, if
any, of the Purchase Option Exercise Price to be paid in shares of Common Equity
Securities; (v) the Record Date; (vi) the Purchase Option Closing Date (as
defined in clause (d) of this Section 5.4); and (vii) the place at which the
holders of the shares of Callable Common Stock may obtain payment of the
Purchase Option Exercise Price for their shares of Callable Common Stock and any
instructions for obtaining such payment; PROVIDED, HOWEVER, that at any time
prior to the Purchase Option Closing Date, the holder of the Special Common
Stock may determine to make payment of a greater amount of the Purchase Option
Exercise Price in cash than was set forth in the Purchase Exercise Notice.  The
exercise of the Purchase Option is irrevocable upon delivery of the Purchase
Exercise Notice, and such action shall not require another notice to be given in
accordance with this Section 5.4.  If the holder of the Special Common Stock
elects to exercise the Purchase Option by delivering solely shares of Common
Equity Securities, such exercise may occur by means of a merger of either a
subsidiary of the holder of the Special Common Stock with and into the
Corporation or the Corporation with and into a subsidiary of the holder of the
Special Common Stock, pursuant to which Callable Common Stock shall be cancelled
in exchange for the shares of Common Equity Securities.

          (d)  The "Purchase Option Closing Date" shall be a date, not less than
20 days nor more than 40 days, after the date of the Purchase Option Exercise
Notice on which all of the issued and outstanding shares of Callable Common
Stock will be purchased; PROVIDED, HOWEVER, that the Purchase Option Closing
Date will be such later date as provided by (i) the last sentence of Section 5.6
hereof in the event that the conditions described therein are satisfied or (ii)
Section 5.12 hereof in the event that the conditions described therein are
satisfied.

     SECTION 5.5.  CLOSING.   On or before the Purchase Option Closing Date, the
holder of the Special Common Stock shall deposit the full amount of the Purchase
Option Exercise Price for all of the issued and outstanding shares of Callable
Common Stock with a bank, transfer agent or similar entity (the "Payment Agent")
designated by the holder of the Special Common Stock to pay, on the holder's
behalf, the Purchase Option Exercise Price.  Cash, if any, and shares of Common
Equity Securities, if any, deposited with the Payment Agent shall be delivered
in trust for the benefit of the holders of record of the Callable Common Stock
on the Record Date.  The holder of the Special Common Stock shall provide the
Payment Agent with irrevocable instructions to pay, on or within 5 days after
the Purchase 

                                      -7-

<PAGE>

Option Closing Date, the Purchase Option Exercise Price for the Callable 
Common Stock to such record holders upon surrender of their certificates 
representing shares of Callable Common Stock.  Payment for shares of Callable 
Common Stock shall be mailed to each such record holder at the address set 
forth in the Corporation's records or at the address provided by each such 
holder or, if no address is set forth in the Corporation's records for any 
such holder or provided by such holder, to such holder at the address of the 
Corporation, but only upon receipt from such holder of certificates 
evidencing shares of Callable Common Stock.  Any cash or shares of Common 
Equity Securities deposited with the Payment Agent pursuant to this Section 
5.5 remaining unclaimed for two years following the Purchase Option Closing 
Date shall be returned to the holder of the Special Common Stock at its 
request.  At the request of the holder of the Special Common Stock, the 
Corporation shall provide, or shall cause its transfer agent to provide, to 
the holder of the Special Common Stock or to the Payment Agent, free of 
charge, a complete list of the record holders of the shares of Callable 
Common Stock, including the number of shares of Callable Common Stock held of 
record and the address of each record holder.

     SECTION 5.6.  REGISTRATION OF COMMON EQUITY SECURITIES.  If the holder of
the Special Common Stock fails by the Purchase Option Closing Date set forth in
the Purchase Option Exercise Notice, with respect to any shares of Common Equity
Securities to be delivered as payment of the Purchase Option Exercise Price on
such date, to have (i) a registration statement declared effective under the
Securities Act or (ii) such shares of Common Equity Securities to be issued in
connection therewith (A) listed on the principal national securities exchange on
which the Common Equity Securities are then listed or (B) if the Common Equity
Securities are not then listed on a national securities exchange, listed on the
Nasdaq National Market if the Common Equity Securities are traded thereon, then
in either of such cases the holder of the Special Common Stock shall be
obligated to make such payment in cash on the Purchase Option Closing Date.
Notwithstanding any other provision herein to the contrary, the holder of the
Special Common Stock shall not be in breach or violation of this Article V for
any failure to timely pay any amount due and payable to the record holders of
Callable Common Stock hereunder in shares of the Common Equity Securities if
such failure to timely pay such amount arises from a delay in satisfying any of
the provisions of this Section 5.6, so long as the holder of the Special Common
Stock shall continue to diligently seek the satisfaction thereof; PROVIDED,
HOWEVER, that such delay may not exceed sixty (60) days from the original due
date of such payment (such original due date being not less than 20 days, nor
more than 40 days, after the date of the Purchase Option Exercise Notice).

     SECTION 5.7.  TRANSFER OF TITLE.   Transfer of title to the holder of the
Special Common Stock of all of the issued and outstanding shares of Callable
Common Stock shall be deemed to occur automatically on the Purchase Option
Closing Date subject to the payment by the holder of the Special Common Stock to
the Payment Agent on or before such date of the amount owing to the record
holders of Callable Common Stock as determined in accordance with Section 5.2
hereof, and thereafter the Corporation shall be entitled to treat the 

                                      -8-

<PAGE>

holder of the Special Common Stock as the sole holder of all issued and 
outstanding shares of Callable Common Stock, notwithstanding the failure of 
any holder of shares of Callable Common Stock to tender the certificates 
representing such shares to the Payment Agent for payment therefor in 
accordance with Section 5.5 hereof.  The Corporation shall instruct its 
transfer agent not to accept any shares of Callable Common Stock for transfer 
on and after the Purchase Option Closing Date, except for the shares of 
Callable Common Stock transferred by the holder of the Special Common Stock.  
The Corporation shall take all actions reasonably requested by the holder of 
the Special Common Stock to assist in effectuating the transfer of shares of 
Callable Common Stock in accordance with this Article V.  After the Purchase 
Option Closing Date, the record holders of the Callable Common Stock as 
determined in accordance with Section 5.6 above shall have no rights in 
connection with such Callable Common Stock other than the right to receive 
the Purchase Option Exercise Price.

     SECTION 5.8.  ASSIGNMENT.  Upon the assignment, delegation, transfer or
sale by any record holder of Callable Common Stock, such shares of Callable
Common Stock shall continue to be subject to the Purchase Option and the other
terms and conditions of this Article V.

     SECTION 5.9.  LEGEND.

          (a)  Any certificates evidencing shares of Callable Common Stock
issued by or on behalf of the Corporation shall bear a legend in substantially
the following form:

         THE SECURITIES OF SPIROS DEVELOPMENT CORPORATION II, INC., A 
         DELAWARE CORPORATION ("SPIROS CORP. II"), EVIDENCED HEREBY 
         ARE SUBJECT TO AN OPTION AS DESCRIBED IN THE AMENDED AND 
         RESTATED CERTIFICATE OF INCORPORATION OF SPIROS CORP. II, AS 
         AMENDED FROM TIME TO TIME, TO PURCHASE SUCH SECURITIES AT A 
         PURCHASE PRICE DETERMINED IN ACCORDANCE WITH ARTICLE V 
         THEREOF, EXERCISABLE BY WRITTEN NOTICE AT ANY TIME DURING 
         THE PERIOD SET FORTH THEREIN.  COPIES OF THE AMENDED AND 
         RESTATED CERTIFICATE OF INCORPORATION ARE AVAILABLE AT THE 
         PRINCIPAL PLACE OF BUSINESS OF SPIROS CORP. II AT 7475 LUSK 
         BOULEVARD, SAN DIEGO, CALIFORNIA 92121, AND WILL BE 
         FURNISHED TO ANY SPIROS CORP. II STOCKHOLDER ON REQUEST AND 
         WITHOUT COST.
    
          (b)  Upon the termination or expiration (other than by exercise) of
the Purchase Option, the Corporation shall, at the request of any holder of
shares of Callable Common Stock bearing the legend described in this Section
5.9(a), take such steps as are necessary to remove such legend from such shares
of Callable Common Stock.

                                      -9-

<PAGE>

     SECTION 5.10.  TERMINATION.  The Purchase Option and the provisions of this
Article V shall terminate on the earliest to occur of: (1) the Purchase Option
Closing Date; (2) if the Purchase Option is not exercised, 11:59 p.m., San Diego
time, the Purchase Option Expiration Date; or (3) receipt by the Corporation of
written notice of the occurrence of any of the following events, which notice
shall be provided by the holder of the Special Common Stock promptly after the
occurrence of any such event:  (a)  the holder of the Special Common Stock fails
to make the payment described in Section 5.3 of this Article V on the Purchase
Option Closing Date; (b) the holder of the Special Common Stock (i) seeks the
liquidation, reorganization, dissolution or winding-up of itself or the
composition or readjustment of all or substantially all of its debts, (ii)
applies for or consents to the appointment of, or the taking of possession by, a
receiver, custodian, trustee or liquidator of itself or of all or substantially
all of its assets, (iii) makes a general assignment for the benefit of its
creditors, (iv) commences a voluntary case under Title 11 of the United States
Code, (v) files a petition seeking to take advantage of any other law relating
to bankruptcy, insolvency, reorganization, winding-up or composition or
readjustment of debt or (vi) adopts any resolution of its Board or shareholders
for the purpose of effecting any of the foregoing; (c) a proceeding or case is
commenced without the application or consent of the holder of the Special Common
Stock and such proceeding or case continues undismissed, or an order, judgment
or decree approving or ordering any of the following is entered and continues
unstayed and in effect for a period of sixty (60) days from and after the date
service of process is effected upon the holder of the Special Common Stock,
seeking (i) the liquidation, reorganization, dissolution or winding up, or the
composition or readjustment of all or substantially all of its debts, (ii) the
appointment of a trustee, receiver, custodian, liquidator or the like of the
holder of the Special Common Stock or of all or substantially all of its assets
or (iii) similar relief in respect of the holder of the Special Common Stock
under any law relating to bankruptcy, insolvency, reorganization, winding up or
the composition or readjustment of debt; or (d) material default by the holder
of the Special Common Stock on any material loan agreement which default is not
cured in accordance with such loan agreement. The Corporation shall promptly
notify each holder of record of Callable Common Stock in writing upon the
occurrence of an event specified herein.

     SECTION 5.11   AMENDMENT.  This Article may not be released, discharged,
amended or modified in any manner except by an instrument approved by the holder
of the outstanding shares of Special Common Stock and the holders of record of
two-thirds (2/3) of the outstanding shares of Callable Common Stock of the
Corporation; provided, however, that, except as expressly provided herein,
without the approval of the holders of record of ninety percent (90%) of the
Callable Common Stock, this Article V may not be amended to change (a) the
amounts of the Purchase Option Exercise Price, (b) the relevant periods during
which and the conditions under which the Purchase Option may be exercised and
the Purchase Option Exercise Price may be paid, (c) the type of securities or
method of calculating the number of securities to be issued upon the payment of
the Purchase Option Exercise Price or (d) the provisions of this Section 5.11.

                                     -10-

<PAGE>

     SECTION 5.12.  NO CONFLICTING ACTION.   The Corporation shall not take, or
permit any other person or entity within its control to take, any action
inconsistent with the rights of the holder of the Special Common Stock under
this Article V.  The Corporation shall not enter into any arrangement, agreement
or understanding, either oral or in writing, that is inconsistent with the
rights of the holder of the Special Common Stock and the obligations of the
Corporation hereunder.

                                       
                                   ARTICLE VI

                              CORPORATE EXISTENCE

     The Corporation shall have a perpetual existence.

                                       
                                   ARTICLE VII

                                    DIRECTORS

     SECTION 7.1.  SIZE OF BOARD.

          (a)  The number of directors shall be as specified in the Bylaws of
the Corporation, except that until the earliest of (i) the exercise of the
Purchase Option, (ii) the Purchase Option Expiration Date or (iii) the date of
termination of the Purchase Option pursuant to Section 5.10 hereof, there shall
be five directors.  In no event will the number of directors be less than five.
Directors need not be stockholders of the Corporation.

          (b)  Upon termination of the right of the holder of Special Common
Stock, as a class, to vote for directors pursuant to Article IV hereof, the term
of office of all Special Common Stock Directors then in office shall terminate
immediately.

     SECTION 7.2.  ELECTIONS.  Elections of directors need not be by written
ballot except and to the extent provided in the bylaws of the Corporation.


                                  ARTICLE VIII

          EXCULPATION AND INDEMNIFICATION OF DIRECTORS, OFFICERS AND OTHERS

     SECTION 8.1.  EXCULPATION.

          (a)  DELAWARE.  A director or officer of the Corporation shall not be
personally liable to the Corporation or its stockholders for monetary damages
for breach of

                                     -11-

<PAGE>

fiduciary duty as a director or officer, except for liability (i) for any 
breach of the director's or officer's duty of loyalty to the Corporation or 
its stockholders, (ii) for acts or omissions not in good faith or which 
involve intentional misconduct or a knowing violation of law, (iii) under 
Section 174 of the Delaware General Corporation Law or (iv) for any 
transaction from which the director or officer derived any improper personal 
benefit.  If the Delaware General Corporation Law is hereafter amended to 
further reduce or to authorize, with the approval of the Corporation's 
stockholders, further reductions in the liability of the Corporation's 
directors or officers for breach of fiduciary duty, then a director or 
officer of the Corporation shall not be liable for any such breach to the 
fullest extent permitted by the Delaware General Corporation Law as so 
amended.

          (b)  CALIFORNIA.  The liability of each and every director or officer
of the Corporation for monetary damages shall be eliminated to the fullest
extent permissible under California law.

          (c)  CONSISTENCY.  In the event of any inconsistency between
Paragraphs (a) and (b) of this Section 8.1, the controlling Paragraph, as to any
particular issue with regard to any particular matter, shall be the one which
provides to the director or officer in question the greatest protection from
liability.

     SECTION 8.2.  INDEMNIFICATION.

          (a)  DELAWARE.  To the extent permitted by applicable law, the
Corporation is also authorized to provide indemnification of (and advancement of
expenses to) such agents (and any other persons to which Delaware law permits
the corporation to provide indemnification) through bylaw provisions, agreements
with such agents or other persons, vote of stockholders or disinterested
directors or otherwise, in excess of the indemnification and advancement
otherwise permitted by Section 145 of the Delaware General Corporation Law,
subject only to limits created by applicable Delaware law (statutory or
nonstatutory), with respect to actions for breach of duty to the Corporation,
its stockholders, and others.

          (b)  CALIFORNIA.  The Corporation is authorized to indemnify the
directors and officers of the Corporation to the fullest extent permissible
under California law.  Moreover, the Corporation is authorized to provide
indemnification of (and advancement of expenses to) agents (as defined in
Section 317 of the California Corporations Code) through bylaw provisions,
agreements with agents, vote of shareholders or disinterested directors or
otherwise, in excess of the indemnification and advancement otherwise permitted
by Section 317 of the California Corporations Code, subject only to applicable
limits set forth in Section 204 of the California Corporations Code, with
respect to actions for breach of duty to the corporation and its shareholders.

          (c)  CONSISTENCY.  In the event of any inconsistency between
Paragraphs (a) and (b) of this Section 8.2, the controlling Paragraph, as to any
particular issue with 

                                     -12-

<PAGE>

regard to any particular matter, shall be the one which authorizes for the 
benefit of the agent or other person in question the provision of the 
fullest, promptest, most certain or otherwise most favorable indemnification 
and/or advancement.

     SECTION 8.3.  EFFECT OF REPEAL OR MODIFICATION.  Any repeal or modification
of any of the foregoing provisions of this Article VIII shall not adversely
affect any right or protection of a director, officer, agent or other person
existing at the time of, or increase the liability of any director or officer of
the Corporation with respect to any acts or omissions of such director or
officer occurring prior to, such repeal or modification. 

                                       
                                   ARTICLE IX

                               PREEMPTIVE RIGHTS


     No holder of shares of stock of the Corporation shall have any preemptive
or other right, except as such rights are expressly provided by contract, to
purchase or subscribe for or receive any shares of any class, or series thereof,
of stock of the Corporation, whether now or hereafter authorized, or any
warrants, options, bonds, debentures or other securities convertible into,
exchangeable for or carrying any right to purchase any share of any class, or
series thereof, of stock; but such additional shares of stock and such warrants,
options, bonds, debentures or other securities convertible into, exchangeable
for or carrying any right to purchase any shares of any class, or series
thereof, of stock may be issued or disposed of by the Board to such persons, and
on such terms and for such lawful consideration as in its discretion it shall
deem advisable or as the Corporation shall have by contract agreed.

                                       
                                   ARTICLE X

                            AMENDMENTS TO CERTIFICATE

     Except as set forth in Section 4.4 and 5.11, the Corporation reserves the
right to repeal, alter, amend or rescind any provision contained in this Amended
and Restated Certificate of Incorporation and/or any provision contained in any
amendment to or any restatement of this Amended and Restated Certificate of
Incorporation, in the manner now or hereafter prescribed by statute, and all
rights conferred on stockholders herein are granted subject to this reservation.

                                     -13-

<PAGE>
                                       
                                   ARTICLE XI

                                     BYLAWS

     The Board may from time to time make, amend, supplement or repeal the
Bylaws by the requisite affirmative vote of the Board as set forth in the
Bylaws; provided, however, that the stockholders may change or repeal any bylaw
adopted by the Board by the requisite affirmative vote of stockholders as set
forth in the Bylaws; and, provided further, that no amendment or supplement to
the Bylaws adopted by the Board shall vary or conflict with any amendment or
supplement thus adopted by the stockholders.

                                       
                                 ARTICLE XII

                            STOCKHOLDER APPROVAL

     No action shall be taken by the stockholders of the Corporation except at
an annual or special meeting of stockholders called in accordance with the
Bylaws, and no action shall be taken by the stockholders by written consent. 


                                  ARTICLE XIII

                                     NOTICE

     Advance notice of stockholder nominations for the election of directors and
of business to be brought by stockholders before any meeting of the stockholders
of the Corporation shall be given in the manner provided in the Bylaws of the
Corporation.



                  [REMAINDER OF THIS PAGE INTENTIONALLY LEFT BLANK]

                                     -14-

<PAGE>

    IN WITNESS WHEREOF, the Amended and Restated Certificate of Incorporation
has been executed by the Corporation's President and Chief Executive Officer as
of this 17 day of December, 1997.

                                      SPIROS DEVELOPMENT CORPORATION II, INC. 


                                      By: /s/ David S. Kabakoff
                                         ------------------------------------ 
                                         David S. Kabakoff, 
                                         President and Chief Executive Officer

ATTEST:


/s/ Mitchell R. Woodbury
- - - - ---------------------------------
Mitchell R. Woodbury,
Secretary




            
                                       
                     [SIGNATURE PAGE TO AMENDED AND RESTATED 
                           CERTIFICATE OF INCORPORATION]
                                           
                                     -15-

















<PAGE>

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


                       SPIROS DEVELOPMENT CORPORATION II, INC.
                               (a Delaware corporation)



                              DURA PHARMACEUTICALS, INC.
                               (a Delaware corporation)



                                   4,400,000 Units

                              Each Unit Consisting of
   One Share of Callable Common Stock of Spiros Development Corporation II, Inc.
                            and One Warrant to Purchase
       One-Fourth of One Share of Common Stock of Dura Pharmaceuticals, Inc.



                               U.S. PURCHASE AGREEMENT




Dated:  December 16, 1997


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

<PAGE>

                                  TABLE OF CONTENTS

   SECTION 1. Representations and Warranties . . . . . . . . . . . . . . . .   5
          (a)  Representations and Warranties by the Companies . . . . . . .   5
               (i)     Compliance with Registration Requirements . . . . . .   5
               (ii)    Incorporated Documents. . . . . . . . . . . . . . . .   6
               (iii)   Independent Accountants . . . . . . . . . . . . . . .   6
               (iv)    Financial Statements. . . . . . . . . . . . . . . . .   6
               (v)     No Material Adverse Change in Business. . . . . . . .   7
               (vi)    Good Standing of the Companies. . . . . . . . . . . .   8
               (vii)   Good Standing of Subsidiaries . . . . . . . . . . . .   8
               (viii)  Capitalization. . . . . . . . . . . . . . . . . . . .   9
               (ix)    Authorization of Agreements . . . . . . . . . . . . .   9
               (x)     Authorization and Description of Units. . . . . . . .  10
               (xi)    Registration or Similar Rights Waived . . . . . . . .  11
               (xii)   Absence of Defaults and Conflicts . . . . . . . . . .  11
               (xiii)  Compliance with Laws. . . . . . . . . . . . . . . . .  13
               (xiv)   Absence of Labor Dispute. . . . . . . . . . . . . . .  13
               (xv)    Absence of Proceedings. . . . . . . . . . . . . . . .  13
               (xvi)   Accuracy of Exhibits. . . . . . . . . . . . . . . . .  13
               (xvii)  Possession of Intellectual Property . . . . . . . . .  14
               (xviii) Absence of Further Requirements . . . . . . . . . . .  14
               (xix)   Possession of Licenses and Permits. . . . . . . . . .  15
               (xx)    Title to Property . . . . . . . . . . . . . . . . . .  15
               (xxi)   Compliance with Cuba Act. . . . . . . . . . . . . . .  15
               (xxii)  Investment Company Act. . . . . . . . . . . . . . . .  16
               (xxiii) Environmental Laws. . . . . . . . . . . . . . . . . .  16
               (xxiv)  Taxes . . . . . . . . . . . . . . . . . . . . . . . .  16
               (xxv)   Insurance . . . . . . . . . . . . . . . . . . . . . .  16
               (xxvi)  Accounting Controls . . . . . . . . . . . . . . . . .  17
               (xxvii)  Lock-up Agreements . . . . . . . . . . . . . . . . .  17
               (xxviii) Affiliate Transactions . . . . . . . . . . . . . . .  17
               (xxix)    Distribution of Prospectuses. . . . . . . . . . . .  17
          (b)  Officer's Certificates. . . . . . . . . . . . . . . . . . . .  17
   SECTION 2. Sale and Delivery to U.S. Underwriters; Closing. . . . . . . .  18
          (a)  Initial U.S. Units. . . . . . . . . . . . . . . . . . . . . .  18
          (b)  U.S. Option Units . . . . . . . . . . . . . . . . . . . . . .  18
          (c)  Payment . . . . . . . . . . . . . . . . . . . . . . . . . . .  18
          (d)  Denominations; Registration . . . . . . . . . . . . . . . . .  19
   SECTION 3. Covenants of the Companies . . . . . . . . . . . . . . . . . .  19
          (a)  Compliance with Securities Regulations and Commission
               Requests. . . . . . . . . . . . . . . . . . . . . . . . . . .  19
          (b)  Filing of Amendments. . . . . . . . . . . . . . . . . . . . .  20


                                        i
<PAGE>

          (c)  Delivery of Registration Statement. . . . . . . . . . . . . .  20
          (d)  Delivery of Prospectuses. . . . . . . . . . . . . . . . . . .  20
          (e)  Continued Compliance with Securities Laws . . . . . . . . . .  20
          (f)  Rule 158. . . . . . . . . . . . . . . . . . . . . . . . . . .  21
          (g)  Use of Proceeds . . . . . . . . . . . . . . . . . . . . . . .  21
          (h)  Listing . . . . . . . . . . . . . . . . . . . . . . . . . . .  21
          (i)  Restriction on Sale of Dura Common Stock. . . . . . . . . . .  21
          (j)  Reporting Requirements. . . . . . . . . . . . . . . . . . . .  22
          (k)  Compliance with NASD Rules. . . . . . . . . . . . . . . . . .  22
          (l)  Lock-up Agreements. . . . . . . . . . . . . . . . . . . . . .  22
   SECTION 4. Payment of Expenses. . . . . . . . . . . . . . . . . . . . . .  22
          (a)  Expenses. . . . . . . . . . . . . . . . . . . . . . . . . . .  22
          (b)  Termination of Agreement. . . . . . . . . . . . . . . . . . .  23
   SECTION 5. Conditions of U.S. Underwriters' Obligations . . . . . . . . .  23
          (a)  Effectiveness of Registration Statement . . . . . . . . . . .  23
          (b)  Opinion of Counsel for the Companies. . . . . . . . . . . . .  23
          (c)  Opinion of Patent Counsel for the Companies . . . . . . . . .  24
          (d)  Opinion of Regulatory Counsel for the Companies . . . . . . .  24
          (e)  Opinion of Counsel for the U.S. Underwriters. . . . . . . . .  24
          (f)  Officers' Certificate . . . . . . . . . . . . . . . . . . . .  24
          (g)  Accountants' Comfort Letter . . . . . . . . . . . . . . . . .  25
          (h)  Bring-down Comfort Letter . . . . . . . . . . . . . . . . . .  25
          (i)  Approval of Listing . . . . . . . . . . . . . . . . . . . . .  25
          (j)  No Objection. . . . . . . . . . . . . . . . . . . . . . . . .  25
          (k)  Lock-up Agreements. . . . . . . . . . . . . . . . . . . . . .  25
          (l)  Purchase of Initial International Units . . . . . . . . . . .  25
          (m)  Conditions to Purchase of U.S. Option Units . . . . . . . . .  25
               (i)    Officers' Certificate. . . . . . . . . . . . . . . . .  26
               (ii)   Opinions of Counsel for the Companies. . . . . . . . .  26
               (iii)  Opinion of Counsel for the U.S. Underwriters . . . . .  26
               (iv)   Bring-down Comfort Letter. . . . . . . . . . . . . . .  26
          (n)  Additional Documents. . . . . . . . . . . . . . . . . . . . .  26
          (o)  Termination of Agreement. . . . . . . . . . . . . . . . . . .  26
   SECTION 6. Indemnification. . . . . . . . . . . . . . . . . . . . . . . .  27
          (a)  Indemnification of U.S. Underwriters. . . . . . . . . . . . .  27
          (b)  Indemnification of the Companies, Directors and Officers. . .  28
          (c)  Actions against Parties; Notification . . . . . . . . . . . .  28
          (d)  Settlement without Consent if Failure to Reimburse. . . . . .  29
   SECTION 7. Contribution . . . . . . . . . . . . . . . . . . . . . . . . .  29
   SECTION 8. Representations, Warranties and Agreements to Survive
              Delivery . . . . . . . . . . . . . . . . . . . . . . . . . . .  30
   SECTION 9. Termination of Agreement . . . . . . . . . . . . . . . . . . .  31
               (a)    Termination; General . . . . . . . . . . . . . . . . .  31


                                       ii
<PAGE>

               (b)    Liabilities. . . . . . . . . . . . . . . . . . . . . .  31
   SECTION 10.  Default by One or More of the U.S. Underwriters. . . . . . .  31
   SECTION 11.  Default by the Companies . . . . . . . . . . . . . . . . . .  32
   SECTION 12.  Notices. . . . . . . . . . . . . . . . . . . . . . . . . . .  32
   SECTION 13.  Parties. . . . . . . . . . . . . . . . . . . . . . . . . . .  33
   SECTION 14.   Governing Law and Time. . . . . . . . . . . . . . . . . . .  33
   SECTION 15.   Effect of Headings. . . . . . . . . . . . . . . . . . . . .  33


                                         iii
<PAGE>


                       SPIROS DEVELOPMENT CORPORATION II, INC.
                               (a Delaware corporation)



                              DURA PHARMACEUTICALS, INC.
                               (a Delaware corporation)



                                   4,400,000 Units

                              Each Unit Consisting of
   One Share of Callable Common Stock of Spiros Development Corporation II, Inc.
                            and One Warrant to Purchase
       One-Fourth of One Share of Common Stock of Dura Pharmaceuticals, Inc.


                              U.S. PURCHASE AGREEMENT

                                                              December 16, 1997

MERRILL LYNCH & CO.
Merrill Lynch, Pierce, Fenner & Smith
          Incorporated
DONALDSON, LUFKIN & JENRETTE SECURITIES CORPORATION
     as U.S. Representatives of the several U.S. Underwriters
c/o Merrill Lynch & Co.
Merrill Lynch, Pierce, Fenner & Smith
          Incorporated
North Tower
World Financial Center
New York, New York  10281-1209

Ladies and Gentlemen:

     Spiros Development Corporation II, Inc., a Delaware corporation ("SDC II"),
and Dura Pharmaceuticals, Inc., a Delaware corporation ("Dura" and, together
with SDC II, the "Companies"), confirm their respective agreements with Merrill
Lynch & Co., Merrill Lynch,


<PAGE>

Pierce, Fenner & Smith ("Merrill Lynch") and each of the other U.S. Underwriters
named in Schedule A hereto (collectively, the "U.S. Underwriters", which term
shall also include any underwriter substituted as hereinafter provided in
Section 10 hereof), for whom Merrill Lynch and Donaldson, Lufkin & Jenrette
Securities Corporation are acting as representatives (in such capacity, the
"U.S. Representatives"), with respect to the issue and sale by the Companies,
and the purchase by the U.S. Underwriters, acting severally and not jointly, of
the respective number of units set forth in said Schedule A, each unit composed
of one share of callable common stock, par value $.001 per share, of SDC II
("SDC II Common Stock") and one warrant (each a "Warrant") that will entitle the
registered owner thereof to purchase one-fourth of one share of common stock,
par value $.001 per share, of Dura ("Dura Common Stock") at a per share exercise
price as set forth in Schedule B hereto, pursuant to and subject to certain
adjustments as set forth in the Warrant certificate to be issued as part of the
Unit Certificate (as hereinafter defined), and with respect to the grant by SDC
II and Dura to the U.S. Underwriters, acting severally and not jointly, of the
option described in Section 2(b) hereof to purchase all or any part of 660,000
additional units to cover over-allotments, if any.  The SDC II Common Stock and
the Warrants will be paired for sale as units by SDC II and Dura and then sold
to the U.S. Underwriters.  The aforesaid 4,400,000 units (the "Initial U.S.
Units") to be purchased by the U.S. Underwriters and all or any part of the
660,000 units subject to the option described in Section 2(b) (the "U.S. Option
Units") are hereinafter called, collectively, the "U.S. Units".

     It is understood that the Companies concurrently are entering into an
agreement dated the date hereof (the "International Purchase Agreement")
providing for the offering by the Companies of an aggregate of 1,100,000 units
composed of one share of SDC II Common Stock and one Warrant (the "Initial
International Units") through arrangements with certain underwriters outside the
United States and Canada (the "Managers") for whom Merrill Lynch International
is acting as lead manager (the "Lead Manager") and the grant by the Companies to
the Managers, acting severally and not jointly, of an option to purchase all or
any part of the Managers' pro rata portion of up to 165,000 additional units
composed of one share of SDC II Common Stock and one Warrant solely to cover
over-allotments, if any (the "International Option Units" and, together with the
U.S. Option Units, the "Option Units").  The Initial International Units and the
International Option Units are hereinafter called the "International Units".  It
is understood that the Companies are not obligated to sell and the U.S.
Underwriters are not obligated to purchase, any Initial U.S. Units unless all of
the Initial International Units are contemporaneously purchased by the Managers.

     The U.S. Underwriters and the Managers are hereinafter collectively called
the "Underwriters", the Initial U.S. Units and the Initial International Units
are hereinafter collectively called the "Initial Units", and the U.S. Units and
the International Units are hereinafter collectively called the "Units".

     The Underwriters concurrently will enter into an Intersyndicate Agreement
of even date herewith (the "Intersyndicate Agreement") providing for the
coordination of certain transactions


                                          2
<PAGE>

among the Underwriters under the direction of Merrill Lynch & Co., Merrill
Lynch, Pierce, Fenner & Smith Incorporated (in such capacity, the "Global
Coordinator").

     The Companies understand that the U.S. Underwriters propose to make a
public offering of the U.S. Units as soon as the U.S. Representatives deem
advisable after this Agreement has been executed and delivered.

     Each Unit initially will be represented by a certificate representing one
or more Warrants and one or more shares of SDC II Common Stock (a "Unit
Certificate").  Each Unit will be transferable only as a whole and as described
in the Prospectuses (as hereinafter defined) through December 31, 1999 or such
earlier date on which the Purchase Option (as defined in the Prospectuses) is
exercised or expires unexercised, after which date the Warrants and the SDC II
Common Stock will trade separately; PROVIDED, HOWEVER, that such separation date
will be accelerated upon the occurrence of an Acceleration Event (as defined in
the Prospectuses) with respect to Dura.  The SDC II Common Stock, the Warrants
and the U.S. Units are more fully described in the Registration Statement (as
hereinafter defined) and the Prospectuses.

     The Companies and the U.S. Underwriters agree that up to 552,200 shares of
the Initial U.S. Units to be purchased by the U.S. Underwriters (the "Reserved
Units") shall be reserved for sale by the U.S. Underwriters to certain eligible
employees and persons having business relationships with the Companies, as part
of the distribution of the U.S. Units by the U.S. Underwriters, subject to the
terms of this Agreement, the applicable rules, regulations and interpretations
of the National Association of Securities Dealers, Inc. and all other applicable
laws, rules and regulations.  To the extent that such Reserved Units are not
orally confirmed for purchase by such eligible employees and persons having
business relationships with the Companies by the end of the first business day
after the date of this Agreement, such Reserved Units may be offered to the
public as part of the public offering contemplated hereby.

     The Companies have filed with the Securities and Exchange Commission (the
"Commission") a combined registration statement (Nos. 333-37673 and
333-37673-01) covering the registration of the U.S. Units under the Securities
Act of 1933, as amended (the "1933 Act"), including the related preliminary
prospectus or prospectuses, (a) with respect to SDC II, on Form S-1, relating to
the SDC II Common Stock comprising a portion of the U.S. Units, and (b) with
respect to Dura, on Form S-3, relating to the Warrants comprising a portion of
the U.S. Units, the Dura Common Stock underlying the Warrants and the Dura
Common Stock issuable upon exercise of the Purchase Option.  Promptly after
execution and delivery of this Agreement, the Companies will either (i) prepare
and file a prospectus in accordance with the provisions of Rule 430A ("Rule
430A") of the rules and regulations of the Commission under the 1933 Act (the
"1933 Act Regulations") and paragraph (b) of Rule 424 ("Rule 424(b)") of the
1933 Act Regulations or (ii) if the Companies have elected to rely upon Rule 434
("Rule 434") of the 1933 Act Regulations, prepare and file a term sheet (a "Term
Sheet") in accordance with the provisions of Rule 434 and Rule 424(b).  Two
forms of prospectus are to be used in connection with the offering and sale of
the Units:  one relating to the U.S. Units (the "Form of U.S.


                                          3
<PAGE>

Prospectus") and one relating to the International Units (the "Form of
International Prospectus").  The Form of International Prospectus is identical
to the Form of U.S. Prospectus, except for the front cover and back cover pages,
the information under the caption "Underwriting", the inclusion in the
"Prospectus Summary" section of the Form of International Prospectus of a
paragraph under the caption "United States Taxation of Non-U.S. Persons" and the
exclusion in the Form of International Prospectus of a section under the caption
"United States Federal Income Tax Consequences."  The information included in
any such prospectus or in any such Term Sheet, as the case may be, that was
omitted from such registration statement at the time it became effective but
that is deemed to be part of such registration statement at the time it became
effective (A) pursuant to paragraph (b) of Rule 430A is referred to as "Rule
430A Information" or (B) pursuant to paragraph (d) of Rule 434 is referred to as
"Rule 434 Information".  Each Form of U.S. Prospectus and Form of International
Prospectus used before such registration statement became effective, and any
prospectus that omitted, as applicable, the Rule 430A Information or the Rule
434 Information, that was used after such effectiveness and prior to the
execution and delivery of this Agreement, is herein called a "preliminary
prospectus".  Such registration statement, including the exhibits thereto,
schedules thereto, if any, and the documents incorporated by reference therein
pursuant to Item 12 of Form S-3 under the 1933 Act, at the time it became
effective and including the Rule 430A Information and the Rule 434 Information,
as applicable, is herein called the "Registration Statement".  Any registration
statement filed pursuant to Rule 462(b) of the 1933 Act Regulations is herein
referred to as the "Rule 462(b) Registration Statement", and after such filing
the term "Registration Statement" shall include the Rule 462(b) Registration
Statement.  The final Form of U.S. Prospectus and the final Form of
International Prospectus, including the documents incorporated by reference
therein pursuant to Item 12 of Form S-3 under the 1933 Act, in the forms first
furnished to the Underwriters for use in connection with the offering of the
Units (the "Unit Offering") are herein called the "U.S. Prospectus" and the
"International Prospectus", respectively, and, collectively, the "Prospectuses".
If Rule 434 is relied on, the term "U.S. Prospectus" and "International
Prospectus" shall refer to the preliminary U.S. Prospectus dated December 1,
1997 and the preliminary International Prospectus dated December 1, 1997,
respectively, each together with the applicable Term Sheet and all references in
this Agreement to the date of such Prospectuses shall mean the date of the
applicable Term Sheet.  For purposes of this Agreement, all references to the
Registration Statement, any preliminary prospectus, the U.S. Prospectus, the
International Prospectus or any Term Sheet or any amendment or supplement to any
of the foregoing shall be deemed to include the copy filed with the Commission
pursuant to its Electronic Data Gathering, Analysis and Retrieval system
("EDGAR").

     Prior to the Closing Time (as defined), Dura intends to acquire all of the
outstanding capital stock of Spiros Development Corporation ("SDC") for an
aggregate purchase price of approximately $45.7 million, payable in cash, shares
of Dura Common Stock, or any combination thereof (the "SDC Purchase").


                                          4
<PAGE>

     All references in this Agreement to financial statements and schedules and
other information which is "contained", "included" or "stated" in the
Registration Statement, any preliminary prospectus (including the Form of U.S.
Prospectus and the Form of International Prospectus) or the Prospectuses (or
other references of like import) shall be deemed to mean and include all such
financial statements and schedules and other information which is incorporated
by reference in the Registration Statement, any preliminary prospectus
(including the Form of U.S. Prospectus and the Form of International Prospectus)
or the Prospectuses, as the case may be; and all references in this Agreement to
amendments or supplements to the Registration Statement, any preliminary
prospectus or the Prospectuses shall be deemed to mean and include the filing of
any document under the Securities Exchange Act of 1934 (the "1934 Act") which is
incorporated by reference in the Registration Statement, such preliminary
prospectus or the Prospectuses, as the case may be.

     SECTION 1.  REPRESENTATIONS AND WARRANTIES.

     (a)  REPRESENTATIONS AND WARRANTIES BY THE COMPANIES.  The Companies
jointly and severally represent and warrant to each U.S. Underwriter as of the
date hereof, as of the Closing Time referred to in Section 2(c) hereof, and as
of each Date of Delivery (if any) referred to in Section 2(b) hereof, and agree
with each U.S. Underwriter, as follows:

          (i)  COMPLIANCE WITH REGISTRATION REQUIREMENTS.  Dura meets the
     requirements for use of Form S-3 under the 1933 Act.  Each of the
     Registration Statement and any Rule 462(b) Registration Statement has
     become effective under the 1933 Act and no stop order suspending the
     effectiveness of the Registration Statement or any Rule 462(b) Registration
     Statement has been issued under the 1933 Act and no proceedings for that
     purpose have been instituted or are pending or, to the knowledge of the
     Companies, are contemplated by the Commission, and any request on the part
     of the Commission for additional information has been complied with.

          At the respective times the Registration Statement, any Rule 462(b)
     Registration Statement and any post-effective amendments thereto become
     effective and at the Closing Time (and, if any U.S. Option Units are
     purchased, at the Date of Delivery), the Registration Statement, the Rule
     462(b) Registration Statement and any amendments and supplements thereto
     complied and will comply in all material respects with the requirements of
     the 1933 Act and the 1933 Act Regulations and did not and 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.  Neither of the Prospectuses nor any amendments or
     supplements thereto, at the time the Prospectuses or any amendments or
     supplements were issued and at the Closing Time (and, if any U.S. Option
     Units are purchased, at the Date of Delivery), included or will include an
     untrue statement of a material fact or omitted or will omit to state a
     material fact necessary in order to make the statements therein, in the
     light of the circumstances under which they were made, not misleading.  If
     Rule 434 is used, the Companies will


                                          5
<PAGE>

     comply with the requirements of Rule 434.  The representations and
     warranties in this subsection shall not apply to statements in or omissions
     from the Registration Statement or the U.S. Prospectus made in reliance
     upon and in conformity with information furnished to the Companies in
     writing by any U.S. Underwriter through Merrill Lynch expressly for use in
     the Registration Statement or the U.S. Prospectus.

          Each preliminary prospectus and the prospectuses filed as part of the
     Registration Statement as originally filed or as part of any amendment
     thereto, or filed pursuant to Rule 424 under the 1933 Act, complied when so
     filed in all material respects with the 1933 Act Regulations and each
     preliminary prospectus and the Prospectuses delivered to the Underwriters
     for use in connection with this offering was identical to the
     electronically transmitted copies thereof filed with the Commission
     pursuant to EDGAR, except to the extent permitted by Regulation S-T.

          (ii)      INCORPORATED DOCUMENTS.  The documents incorporated or
     deemed to be incorporated by reference in the Registration Statement and
     the Prospectuses, when they became effective or at the time they were or
     hereafter are filed with the Commission, complied and will comply in all
     material respects with the requirements of the 1933 Act and the 1933 Act
     Regulations or the Securities Exchange Act of 1934 (the "1934 Act") and the
     rules and regulations of the Commission thereunder (the "1934 Act
     Regulations"), as applicable, and, when read together with the other
     information in the Prospectuses, at the time the Registration Statement
     became effective, at the time the Prospectuses were issued and at the
     Closing Time (and, if any U.S. Option Units are purchased, at the Date of
     Delivery), did not and 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.

          (iii)     INDEPENDENT ACCOUNTANTS.  Deloitte & Touche LLP, which are
     reporting upon the audited financial statements and supporting schedules
     with respect to Dura, Spiros Development Corporation ("SDC") and SDC II
     incorporated by reference or included in the Registration Statement, are
     independent accountants as required by the 1933 Act and the 1933 Act
     Regulations.

          (iv)      FINANCIAL STATEMENTS.  (A)  The financial statements of Dura
     incorporated by reference or included in the Registration Statement and the
     Prospectuses, together with the related schedules and notes, present fairly
     the financial position of Dura (and, for relevant periods consistent with
     the Commission's rules and regulations, Dura's Subsidiaries (as defined in
     clause (vii) below)) at the dates indicated and the statements of
     operations, shareholders' equity and cash flows of Dura (and, for relevant
     periods consistent with the Commission's rules and regulations, each of the
     Subsidiaries) for the periods specified; except as otherwise stated in the
     Registration Statement, said financial statements have been prepared in
     conformity with generally accepted accounting


                                          6
<PAGE>

     principles ("GAAP") applied on a consistent basis throughout the periods
     involved.  The supporting schedules, if any, included in the Registration
     Statement present fairly in accordance with GAAP the information required
     to be stated therein.  The selected financial data and summary financial
     information for Dura and the Subsidiaries included in the Prospectuses
     present fairly in accordance with GAAP the information shown therein and
     have been compiled on a basis consistent with that of the audited financial
     statements of Dura and the Subsidiaries included in the Registration
     Statement.  Other than the financial statements and schedules referred to
     in this paragraph (iv), no other financial statements or schedules are
     required to be included in the Registration Statement or incorporated
     therein by reference.

          (B)  The financial statements of SDC included in the Registration
     Statement and the Prospectuses, together with the related schedules and
     notes, present fairly the financial position of SDC at the dates indicated
     and the statements of operations, shareholders' equity and cash flows of
     SDC for the periods specified; except as otherwise stated in the
     Registration Statement, said financial statements have been prepared in
     conformity with GAAP applied on a consistent basis throughout the periods
     involved.

          (C)  The financial statements of SDC II included in the Registration
     Statement and the Prospectuses, together with the related schedules and
     notes, present fairly the financial position of SDC II at the date
     indicated; except as otherwise stated in the Registration Statement, said
     financial statements have been prepared in conformity with GAAP.

          (D)  The pro forma financial statements and the related notes thereto
     included in the Registration Statement and the Prospectuses or incorporated
     therein by reference present fairly in accordance with GAAP the information
     shown therein, have been prepared in accordance with the Commission's rules
     and guidelines with respect to pro forma financial statements and have been
     properly compiled on the bases described therein, and the assumptions used
     in the preparation thereof are reasonable and the adjustments used therein
     are appropriate to give effect to the transactions and circumstances
     referred to therein.

          (v)       NO MATERIAL ADVERSE CHANGE IN BUSINESS.  Since the 
     respective dates as of which information is given in the Registration 
     Statement and the Prospectuses, except as otherwise stated therein, (A) 
     there has been no material adverse change in the condition, financial or 
     otherwise, or in the earnings, business affairs or business prospects of 
     Dura and the Subsidiaries (as defined below), considered as one enterprise,
     whether or not arising in the ordinary course of business (a "Dura Material
     Adverse Effect"), (B) there has been no material adverse change in the 
     condition, financial or otherwise, or in the earnings, business affairs or
     business prospects of SDC, whether or not arising in the ordinary course 
     of business (an "SDC Material Adverse Effect"), (C) there has been no 
     material adverse change in the condition, financial or otherwise, or in 
     the earnings,


                                          7
<PAGE>

     business affairs or business prospects of SDC II, whether or not arising
     in the ordinary course of business (an "SDC II Material Adverse Effect"),
     (D) there have been no transactions entered into by Dura or any Subsidiary,
     SDC or SDC II, other than in the ordinary course of business, which are
     material with respect to Dura and the Subsidiaries, considered as one
     enterprise, SDC or SDC II, respectively, and (D) there has been no dividend
     or distribution of any kind declared, paid or made by each of SDC, SDC II
     or Dura, on any class of its respective capital stock.  As used in this
     Agreement on the date hereof, a "Material Adverse Effect" shall mean both a
     Dura Material Adverse Effect and an SDC Material Adverse Effect.

          (vi)      GOOD STANDING OF THE COMPANIES.  (A)  Dura has been duly
     organized and is validly existing as a corporation in good standing under
     the laws of the State of Delaware and has corporate power and authority to
     own, lease and operate its properties and to conduct its business as
     described in the Prospectuses and to enter into and perform its obligations
     under this Agreement; and Dura is duly qualified as a foreign corporation
     to transact business and is in good standing in each other jurisdiction in
     which such qualification is required, whether by reason of the ownership or
     leasing of property or the conduct of business, except where the failure to
     so qualify or to be in good standing would not result in a Dura Material
     Adverse Effect.

          (B)  SDC II has been duly organized and is validly existing as a
     corporation in good standing under the laws of the State of Delaware and
     has corporate power and authority to own, lease and operate its properties
     and to conduct its business as described in the Prospectuses and to enter
     into and perform its obligations under this Agreement; and SDC II is duly
     qualified as a foreign corporation to transact business and is in good
     standing in each jurisdiction in which such qualification is required,
     whether by reason of the ownership or leasing of property or the conduct of
     business, except where the failure to so qualify or to be in good standing
     would not result in an SDC II Material Adverse Effect.

          (vii)     GOOD STANDING OF SUBSIDIARIES.   Dura Delivery Systems,
     Inc., a Delaware corporation ("DDSI"), Health Script Pharmacy Services,
     Inc., a Colorado corporation ("Health Script"), Healthco Solutions, Inc., a
     Colorado corporation ("Healthco"), HS Wholesaler, Inc., a Colorado
     corporation ("HS Wholesaler"), Scandi Acquisition Corp., a Delaware
     corporation ("Scandi"), DCI, Ltd., a corporation organized under the laws
     of the Cayman Islands ("DCI"), Dura (Bermuda) Trading Company Ltd., a
     corporation organized under the laws of Bermuda ("Dura (Bermuda)"), Dura
     (Barbados) Ltd., a corporation organized under the laws of Barbados ("Dura
     (Barbados)"), Dura (Barbados) Holding Company Ltd., a corporation organized
     under the laws of Barbados ("Dura (Barbados) Holding"), Dura USA Holdings,
     Inc., a Delaware corporation ("Dura USA") and SDC Acquisition Corp., a
     Delaware corproation ("SDC Acquiisition") are the only subsidiaries of Dura
     (DDSI, Health Script, Healthco, HS Wholesaler, Scandi, DCI, Dura (Bermuda),
     Dura (Barbados), Dura (Barbados) Holding, Dura USA, SDC Acquisition



                                          8
<PAGE>

     and, unless otherwise indicated, SDC, are hereinafter referred to as the
     "Subsidiaries").  Except for the Subsidiaries, neither Dura nor any
     Subsidiary owns any shares of stock or any other equity securities of any
     corporation or has any equity interests in any firm, partnership,
     association or other entity other than 775,193 shares of Common Stock of
     Trega Biosciences, Inc. and 754,799 shares of Common Stock of Cosmederm
     Technologies, Inc., each held by Dura.  Each Subsidiary has been duly
     organized and is validly existing as a corporation in good standing under
     the laws of the jurisdiction of its incorporation, has corporate power and
     authority to own, lease and operate its properties and conduct its business
     as described in the Prospectuses and is duly qualified as a foreign
     corporation to transact business and is in good standing in each
     jurisdiction in which such qualification is required, whether by reason of
     the ownership or leasing of property or the conduct of business, except
     where the failure so to qualify or to be in good standing would not result
     in a Material Adverse Effect; all of the issued and outstanding capital
     stock of each Subsidiary has been duly authorized and validly issued, is
     fully paid and non-assessable and (other than with respect to SDC) is owned
     solely by Dura or another Subsidiary free and clear of any security
     interest, mortgage, pledge, lien, encumbrance, claim or equity; none of the
     outstanding shares of capital stock of any Subsidiary was issued in
     violation of the preemptive or similar rights of any securityholder of such
     Subsidiary arising by operation of law, under the charter or by-laws of
     such Subsidiary or under any agreement to which Dura or such Subsidiary is
     a party.

          (B)  Upon the consummation of the SDC Purchase, all of the outstanding
     shares of capital stock of SDC will be owned by Dura free and clear of any
     security interest, mortgage, pledge, lien, encumbrance, claim or equity.

          (viii)    CAPITALIZATION.  The authorized, issued and outstanding
     capital stock of each of Dura and SDC II is as set forth in the
     Prospectuses under the column "Actual" under the captions "Dura
     Capitalization" and "Spiros Corp. II Capitalization", respectively (except,
     in the case of Dura, for subsequent issuances, if any, pursuant to
     reservations, agreements or employee benefit plans referred to in the
     Prospectuses or incorporated by reference therein or pursuant to the
     exercise of convertible securities, warrants or options referred to in the
     Prospectuses or incorporated by reference therein).  The shares of issued
     and outstanding capital stock of each of Dura and SDC II have been duly
     authorized and validly issued and are fully paid and non-assessable; none
     of the outstanding shares of capital stock of Dura or SDC II was issued in
     violation of the preemptive or other similar rights of any securityholder
     of Dura or SDC II, respectively, arising by operation of law, under the
     charter or by-laws of Dura or SDC II, as the case may be, or under any
     agreement to which Dura or SDC II is a party.  Except as disclosed in the
     Prospectuses or incorporated by reference therein, there are no outstanding
     options, warrants or other rights calling for the issuance of, and no
     commitments, plans or arrangements to issue, any shares of capital stock of
     Dura, SDC


                                          9
<PAGE>

     II or any Subsidiary or any security convertible into or exchangeable for
     capital stock of Dura, SDC II or any Subsidiary.

          (ix)      AUTHORIZATION OF AGREEMENTS.  (A)  This Agreement and the
     International Purchase Agreement have been duly authorized, executed and
     delivered by each of Dura and SDC II.

          (B)  The Warrant Agreement (as hereinafter defined) has been duly
     authorized by Dura, and when executed and delivered by Dura and the Warrant
     Agent thereunder, will constitute a valid and binding agreement of Dura,
     enforceable against Dura in accordance with its terms, except as
     enforcement thereof may be limited by bankruptcy, insolvency (including,
     without limitation, all laws relating to fraudulent transfers),
     reorganization, moratorium or similar laws affecting enforcement of
     creditors' rights generally and except as enforcement thereof is subject to
     general principles of equity (regardless of whether enforcement is
     considered in a proceeding in equity or at law).

          (C)  Each of the Development Agreement, the Technology Agreement, the
     Albuterol and Product Option Agreement, the Manufacturing and Marketing
     Agreement and the Services Agreement (each as defined in the Prospectuses,
     and collectively referred to herein as the "Transaction Agreements") has
     been duly authorized by Dura and SDC II and, in the case of the Technology
     Agreement, Dura, SDC II, SDC and DDSI, and when executed and delivered by
     Dura and SDC II, and, in the case of the Technology Agreement, Dura, SDC
     II, SDC and DDSI, will constitute valid and binding agreements of each of
     Dura, SDC II, SDC and DDSI, as the case may be, enforceable against Dura,
     SDC II, SDC and DDSI in accordance with their terms, except as the
     enforcement thereof may be limited by bankruptcy, insolvency (including,
     without limitation, all laws relating to fraudulent transfers),
     reorganization, moratorium or similar laws affecting  enforcement of
     creditors' rights generally and except as enforcement thereof is subject to
     general principles of equity (regardless of whether enforcement is
     considered in a proceeding in equity or at law).

          (x)       AUTHORIZATION AND DESCRIPTION OF UNITS.  (A)  The SDC II 
     Common Stock to be issued by SDC II as a component of the Units has been 
     duly authorized for issuance and sale to the U.S. Underwriters pursuant 
     to this Agreement and to the Managers pursuant to the International 
     Purchase Agreement, respectively, and, when issued and delivered by SDC 
     II against payment of the purchase price therefor as provided in this 
     Agreement and the International Purchase Agreement, respectively, will 
     be validly issued, fully paid and non-assessable; the SDC II Common 
     Stock conforms in all material respects to the statements relating 
     thereto contained in the Prospectuses and such description conforms to 
     the rights set forth in the instruments defining the same; no holder of 
     SDC II Common Stock will be subject to personal liability by reason of 
     being such a holder; and the issuance of the SDC II Common Stock is not 
     subject to the preemptive or other similar rights of any securityholder 
     of SDC II.

                                          10
<PAGE>

          (B)  The Warrants to be issued as a component of the Units have been
     duly authorized by Dura for issuance and sale to the U.S. Underwriters
     pursuant to this Agreement and to the Managers pursuant to the
     International Purchase Agreement, respectively, and, when duly executed,
     issued and delivered by Dura and duly countersigned by the Warrant Agent
     (as hereinafter defined) in the manner provided for in the Warrant
     Agreement (the "Warrant Agreement") to be entered into between Dura and
     ChaseMellon Shareholder Services, as warrant agent (the "Warrant Agent"),
     and, when issued and delivered by Dura against payment of the purchase
     price therefor as provided in this Agreement and the International Purchase
     Agreement, respectively, will constitute valid and binding obligations of
     Dura, entitled to the benefits of the Warrant Agreement, and will be
     enforceable in accordance with its terms, except as the enforcement thereof
     may be limited by bankruptcy, insolvency (including, without limitation,
     all laws relating to fraudulent transfers), reorganization, moratorium or
     similar laws affecting enforcement of creditors' rights generally and
     except as enforcement thereof is subject to general principles of equity
     (regardless of whether enforcement is considered in a proceeding in equity
     or at law); such Warrants are not subject to the preemptive rights of any
     stockholder of Dura.

          (C)  Dura shall have available such number of shares of Dura Common
     Stock deliverable upon exercise of the Warrants as is sufficient to permit
     the exercise in full of the Warrants.  All shares of Dura Common Stock
     issued upon exercise of the Warrants, when issued and paid for in
     accordance with the terms of the Warrant Agreement, will be duly
     authorized, validly issued, fully paid and nonassessable; shares of Dura
     Common Stock are not subject to the preemptive rights of any stockholder of
     Dura; and all corporate action required to be taken for such authorization,
     issue and sale of the Dura Common Stock will have been validly and
     sufficiently taken upon the issuance of the Warrants; such shares of Dura
     Common Stock conform in all material respects to the descriptions thereof
     contained or incorporated by reference in the Prospectuses and all
     corporate action required to be taken for the authorization, issue and sale
     of such shares of Dura Common Stock has been validly and sufficiently
     taken.

          (xi)      REGISTRATION OR SIMILAR RIGHTS WAIVED.  Except as set 
     forth in the Prospectus, there are no persons with registration or other 
     similar rights to have any securities registered pursuant to the 
     Registration Statement or otherwise registered by the Companies under 
     the 1933 Act who have not waived such rights.

          (xii)     ABSENCE OF DEFAULTS AND CONFLICTS.  (A)  Neither Dura nor
     any Subsidiary is in violation of its charter or by-laws or in default in
     the performance or observance of any obligation, agreement, covenant or
     condition contained in any contract, indenture, mortgage, deed of trust,
     loan or credit agreement, note, lease or other agreement or instrument to
     which Dura or any Subsidiary is a party or by which it or any of them may
     be bound, or to which any of the property or assets of Dura or any
     Subsidiary is subject (collectively, "Agreements and Instruments") except
     for such defaults that would not


                                          11
<PAGE>

     result in a Material Adverse Effect; and the execution, delivery and
     performance of each of this Agreement, the International Purchase
     Agreement, the Warrant Agreement and the Transaction Agreements by Dura,
     SDC and DDSI, as the case may by, the issuance and delivery of the Warrants
     and the issuance of shares of Dura Common Stock upon the exercise of the
     Warrants and the consummation by Dura, SDC and DDSI, as the case may be, of
     the transactions contemplated in this Agreement, the International Purchase
     Agreement, the Warrant Agreement and the Transaction Agreements and in the
     Registration Statement (including the issuance and sale of the Warrants as
     part of the Units) and compliance by Dura, SDC and DDSI, as the case may
     be, with their respective obligations under this Agreement, the
     International Purchase Agreement, the Warrant Agreement and each of the
     Transaction Agreements to which they are a party have been duly authorized
     by all necessary corporate action and do not and will not, whether with or
     without the giving of notice or passage of time or both, conflict with or
     constitute a breach of, or default or Repayment Event (as defined below)
     under, or result in the creation or imposition of any lien, charge or
     encumbrance upon any property or assets of Dura or any Subsidiary pursuant
     to, the Agreements and Instruments (except for such conflicts, breaches or
     defaults or liens, charges or encumbrances that would not result in a
     Material Adverse Effect), nor will such action result in any violation of
     the provisions of the charter or by-laws of Dura or any Subsidiary or any
     applicable material law, statute, rule, regulation, judgment, order, writ
     or decree of any government, government instrumentality or court, domestic
     or foreign, having jurisdiction over Dura or any Subsidiary or any of their
     assets, properties or operations.  As used herein, a "Repayment Event"
     means any event or condition which gives the holder of any note, debenture
     or other evidence of indebtedness (or any person acting on such holder's
     behalf) the right to require the repurchase, redemption or repayment of all
     or a portion of such indebtedness by Dura or any Subsidiary.

          (B)  SDC II is not in violation of its charter or by-laws or in
     default in the performance or observance of any obligation, agreement,
     covenant or condition contained in any contract, indenture, mortgage, deed
     of trust, loan or credit agreement, note, lease or other agreement or
     instrument to which SDC II is a party or by which it may be bound, or to
     which any of the property or assets of SDC II is subject (collectively,
     "SDC II Agreements and Instruments") except for such defaults that would
     not result in an SDC II Material Adverse Effect; and the execution,
     delivery and performance of each of this Agreement, the International
     Purchase Agreement and the Transaction Agreements by SDC II and the
     consummation by SDC II of the transactions contemplated herein, therein and
     in the Registration Statement (including the issuance and sale of the SDC
     II Common Stock as part of the Units and the use of the proceeds from the
     sale of the Units as described in the Prospectuses under the caption "Use
     of Proceeds") and compliance by SDC II with its obligations under this
     Agreement, the International Purchase Agreement and each of the Transaction
     Agreements have been duly authorized by all necessary corporate action and
     do not and will not, whether with or without the giving of notice or
     passage of time or both, conflict with or constitute a breach of, or
     default


                                          12
<PAGE>

     or SDC II Repayment Event (as defined below) under, or result in the
     creation or imposition of any lien, charge or encumbrance upon any property
     or assets of SDC II pursuant to, the SDC II Agreements and Instruments
     (except for such conflicts, breaches or defaults or liens, charges or
     encumbrances that would not result in an SDC II Material Adverse Effect),
     nor will such action result in any violation of the provisions of the
     charter or by-laws of SDC II or any applicable material law, statute, rule,
     regulation, judgment, order, writ or decree of any government, government
     instrumentality or court, domestic or foreign, having jurisdiction over SDC
     II or any of its assets, properties or operations.  As used herein, an "SDC
     II Repayment Event" means any event or condition which gives the holder of
     any note, debenture or other evidence of indebtedness (or any person acting
     on such holder's behalf) the right to require the repurchase, redemption or
     repayment of all or a portion of such indebtedness by SDC II.

          (xiii)    COMPLIANCE WITH LAWS.  Except as set forth in the
     Prospectuses, Dura and the Subsidiaries and SDC II are in compliance in all
     material respects with all applicable laws, statutes, ordinances, rules or
     regulations, the enforcement of which, individually or in the aggregate,
     would be reasonably expected to have a Material Adverse Effect or an SDC II
     Material Adverse Effect, as the case may be.

          (xiv)     ABSENCE OF LABOR DISPUTE.  No labor dispute with the
     employees of Dura or any Subsidiary exists or, to the knowledge of Dura, is
     imminent, and Dura is not aware of any existing or imminent labor
     disturbance by the employees of any of its or any Subsidiary's principal
     suppliers, manufacturers, customers or contractors, which, in either case,
     may reasonably be expected to result in a Dura Material Adverse Effect or
     an SDC II Material Adverse Effect.

          (xv) ABSENCE OF PROCEEDINGS.  There is no action, suit, proceeding,
     inquiry or investigation (except applications for regulatory approval for
     marketing of pharmaceutical products) before or brought by any court or
     governmental agency or body, domestic or foreign, now pending or, to the
     knowledge of either Dura or SDC II, threatened against or affecting Dura or
     any Subsidiary or SDC II that is required to be disclosed in the
     Registration Statement or that might reasonably be expected to have a
     Material Adverse Effect, or an SDC II Material Adverse Effect, or which
     might reasonably be expected to materially and adversely affect the
     properties or assets of either Dura and the Subsidiaries (other than SDC),
     considered as one enterprise, or SDC II or SDC, as the case may be, or the
     consummation of the transactions contemplated in this Agreement, the
     International Purchase Agreement, the Warrant Agreement and the Transaction
     Agreements or the performance by Dura or SDC II of its obligations
     hereunder or thereunder; the aggregate of all pending legal or governmental
     proceedings to which Dura or any Subsidiary or SDC II, as the case may be,
     is a party or which affect any of their respective property or assets is
     subject which are not described in the Registration Statement, including
     ordinary routine litigation incidental to its business, could not


                                          13
<PAGE>

     reasonably be expected to result in a Material Adverse Effect or an SDC II
     Material Adverse Effect, as the case may be.

          (xvi)     ACCURACY OF EXHIBITS.  There are no contracts or documents
     which are required to be described in the Registration Statement, the
     Prospectuses or the documents incorporated by reference therein or to be
     filed as exhibits thereto which have not been described and filed as
     required.

          (xvii)    POSSESSION OF INTELLECTUAL PROPERTY.  (A)  Except as set
     forth in the Prospectuses, each of Dura and the Subsidiaries owns or
     possesses adequate licenses or other rights to use the patents, patent
     rights, licenses, inventions, copyrights, know how (including trade secrets
     and other unpatented and/or unpatentable proprietary or confidential
     information, systems or procedures), which are necessary for the operation
     of their businesses as presently conducted except where the failure to so
     own or have the right to use would not have a Material Adverse Effect.
     Except as disclosed in the Prospectuses, nothing has come to the attention
     of Dura or the Subsidiaries to the effect that (1) any product, process,
     method, substance, part or other material presently contemplated to be sold
     by or employed by Dura or any of the Subsidiaries in connection with Dura's
     or such Subsidiary's business may infringe any patent, trademark, service
     mark, trade name, copyright, license or other right owned by others,
     (2) there is pending or threatened any claim or litigation against or
     affecting Dura and the Subsidiaries contesting their right to sell or use
     any such product, process, method, substance, part or other material or
     (3) there is, or there is pending, any patent, invention, device,
     application or any applicable statute, law, rule, regulation, standard or
     code, in the case of each of clause (1), (2) or (3) above, which could have
     Material Adverse Effect.

          (B)  SDC II will, to the extent provided for in the Technology
     Agreement, have the right to use all patents, patent rights, licenses,
     inventions, copyrights, know how (including trade secrets and other
     unpatented and/or unpatentable proprietary or confidential information,
     systems or procedures) owned or controlled by Dura or the Subsidiaries,
     which are necessary for the operation of its business as described in the
     Prospectuses.  SDC II has not received any notice of proceedings relating
     to revocation or modification of any such licenses, permits, certificates,
     consents, orders, approvals or authorizations which singularly or in the
     aggregate, if the subject of an unfavorable ruling or finding, could have a
     SDC II Material Adverse Effect.

          (xviii)   ABSENCE OF FURTHER REQUIREMENTS.  (A)  No filing with, or
     authorization, approval, consent, license, order, registration,
     qualification or decree of, any court or governmental authority or agency
     is necessary or required for the performance by the Companies of their
     obligations under this Agreement, the International Purchase Agreement, the
     Warrant Agreement and the Transaction Agreements, in connection with the
     offering, issuance, sale and delivery of the shares of SDC II Common Stock,
     the Warrants or the shares of Dura Common Stock deliverable upon exercise
     of the Warrants


                                          14
<PAGE>

     or the consummation of the transactions contemplated by this Agreement, the
     International Purchase Agreement, the Warrant Agreement and the Transaction
     Agreements, except such as have been already obtained or as may be required
     under the 1933 Act or the 1933 Act Regulations and foreign or state
     securities or blue sky laws.

          (B)  No filing with, or authorization, approval, consent, license,
     order, registration, qualification or decree of, any court or governmental
     authority or agency is necessary or required for the consummation by SDC
     and DDSI of the transactions contemplated by this Agreement, except such as
     have already been obtained.

          (xix)     POSSESSION OF LICENSES AND PERMITS.  Dura and the
     Subsidiaries and SDC II possess such permits, licenses, approvals, consents
     and other authorizations (collectively, "Governmental Licenses") issued by
     the appropriate federal, state, local or foreign regulatory agencies or
     bodies material to the conduct of the business now operated by Dura, the
     Subsidiaries and SDC II, respectively; Dura and the Subsidiaries and SDC II
     are in compliance with the terms and conditions of all such Governmental
     Licenses, except where the failure so to comply would not, singly or in the
     aggregate, have a Material Adverse Effect or a SDC II Material Adverse
     Effect, as the case may be; all of the Governmental Licenses are valid and
     in full force and effect, except when the invalidity of such Governmental
     Licenses or the failure of such Governmental Licenses to be in full force
     and effect would not have a Material Adverse Effect or a SDC II Material
     Adverse Effect, as the case may be; and neither Dura nor any Subsidiary nor
     SDC II has received any notice of proceedings relating to the revocation or
     modification of any such Governmental Licenses which, singly or in the
     aggregate, if the subject of an unfavorable decision, ruling or finding,
     would result in a Material Adverse Effect or an SDC II Material Adverse
     Effect; provided, however, that no FDA approval has been received with
     respect to products that Dura, the Subsidiaries or SDC II currently are not
     permitted to market.

          (xx)      TITLE TO PROPERTY.  Dura and the Subsidiaries have good and
     marketable title to all material properties and assets owned by Dura and
     the Subsidiaries, in each case, free and clear of all mortgages, pledges,
     liens, security interests, claims, restrictions or encumbrances of any kind
     except such as (a) are described or incorporated by reference in the
     Prospectuses or (b) do not, singly or in the aggregate, materially affect
     the value of such property and do not interfere with the use made and
     proposed to be made of such property by Dura or the affected Subsidiaries,
     as the case may be; and all properties held under lease by Dura or any
     Subsidiary are held under valid, subsisting and enforceable leases.

          (B)  SDC II has good and marketable title to all material properties
     and assets described in the Prospectuses as owned by it, free and clear of
     all mortgages, pledges, liens, security interests, claims, restrictions or
     encumbrances of any kind except such as (a) are described in the
     Prospectuses or (b) do not, singly or in the aggregate, materially


                                          15
<PAGE>

     affect the value of such property and do not interfere with the use made
     and proposed to be made of such property by SDC II.

          (xxi)     COMPLIANCE WITH CUBA ACT.  Dura has complied with, and is
     and will be in compliance with, the provisions of that certain Florida act
     relating to disclosure of doing business with Cuba, codified as Section
     517.075 of the Florida statutes, and the rules and regulations thereunder
     (collectively, the "Cuba Act") or is exempt therefrom.

          (xxii)    INVESTMENT COMPANY ACT.  Neither of the Companies is and,
     upon the issuance and sale of the Units as herein contemplated and the
     application of the net proceeds therefrom as described in the Prospectuses,
     will not be an "investment company" or an entity "controlled" by an
     "investment company" as such terms are defined in the Investment Company
     Act of 1940, as amended (the "1940 Act").

          (xxiii)   ENVIRONMENTAL LAWS.  Except as described in the Registration
     Statement and except as would not, singly or in the aggregate, result in a
     Dura Material Adverse Effect, (A) neither Dura nor any Subsidiary is in
     material violation of any federal, state, local or foreign law, rule,
     regulation, ordinance or any judicial or administrative interpretation
     thereof, including any judicial or administrative order, consent, decree or
     judgment, relating to pollution or protection of human health, the
     environment (including, without limitation, ambient air, surface water,
     groundwater, land surface or subsurface strata) or wildlife, including,
     without limitation, laws and regulations relating to the release or
     threatened release of chemicals, pollutants, contaminants, wastes, toxic
     substances, hazardous substances, petroleum or petroleum products
     (collectively, "Hazardous Materials") or to the manufacture, processing,
     distribution, use, treatment, storage, disposal, transport or handling of
     Hazardous Materials (collectively, "Environmental Laws"), (B) Dura and the
     Subsidiaries have all permits, authorizations and approvals required under
     any applicable Environmental Laws and are each in compliance with their
     requirements, (C) there are no pending or, to the best knowledge of Dura,
     threatened administrative, regulatory or judicial actions, suits, demands,
     demand letters, claims, liens, notices of noncompliance or violation,
     investigation or proceedings relating to any Environmental Law against Dura
     or any of the Subsidiaries and (iv) to the best knowledge of Dura, there
     are no events or circumstances that could form the basis of an order for
     clean-up or remediation, or an action, suit or proceeding by any private
     party or governmental body or agency, against or affecting Dura or any
     Subsidiary relating to Hazardous Materials or any Environmental Laws.

          (xxiv)    TAXES.  Dura and the Subsidiaries have filed all federal,
     state, local and foreign tax returns that are required to be filed or have
     duly requested extensions thereof and have paid all taxes required to be
     paid by any of them and any related assessments, fines or penalties, except
     for any such tax, assessment, fine or penalty that is being contested in
     good faith and by appropriate proceedings; and adequate charges, accruals
     and reserves have been provided for in the financial statements referred to
     in Section


                                          16
<PAGE>

     1(a)(iv)(A) above in respect of all federal, state, local and foreign taxes
     for all periods as to which the tax liability of Dura or any Subsidiary has
     not been finally determined or remains open to examination by applicable
     taxing authorities.

          (xxv)     INSURANCE.  Dura and the Subsidiaries carry or are entitled
     to the benefits of insurance in such amounts and covering such risks as is
     generally maintained by companies of established repute engaged in the same
     or similar business and all such insurance is in full force and effect.

          (xxvi)    ACCOUNTING CONTROLS.  Dura and the Subsidiaries maintain a
     system of internal accounting controls sufficient to provide reasonable
     assurance that (A) transactions are executed in accordance with
     management's general and specific authorizations; (B) transactions are
     recorded as necessary to permit preparations of financial statements in
     conformity with GAAP and to maintain accountability for assets; (C) access
     to assets is permitted only in accordance with management's general or
     specific authorizations; and (D) the recorded accountability for assets is
     compared with the existing assets at reasonable intervals and appropriate
     action is taken with respect to any differences.

          (xxvii)   LOCK-UP AGREEMENTS.  The Companies have obtained and
     delivered to the U.S. Underwriters the agreements, in the form of Exhibit D
     hereto, of the persons and entities named in Schedule C annexed hereto to
     the effect that each such person will not, for a period of 90 days from the
     date of this Agreement and except as otherwise provided in their respective
     agreement, without the prior written consent of Merrill Lynch, directly or
     indirectly, offer to sell, grant any option for the sale of, or otherwise
     dispose of any shares of Dura Common Stock or any securities convertible
     into or exercisable for shares of Dura Common Stock owned by such person or
     entity or with respect to which such person has the power of disposition.

          (xxviii)  AFFILIATE TRANSACTIONS.  No relationship, direct or
     indirect, exists between or among any of Dura or any affiliate of Dura, on
     the one hand, and any director, officer, shareholder, customer or supplier
     of any of them, on the other hand, which is required by the 1933 Act or by
     the 1933 Act Regulations to be described in the Registration Statement or
     the Prospectuses and which is not so described or is not described as
     required or is not incorporated by reference therein.

          (xxix)    DISTRIBUTION OF PROSPECTUSES.  The Companies have not
     distributed and, prior to the later to occur of (A) Closing Time and (B)
     completion of the distribution of the Units, will not distribute any
     prospectus (as such term is defined in the 1933 Act and the 1933 Act
     Regulations) in connection with the offering and sale of the Units other
     than the Registration Statement, any preliminary prospectus, the
     Prospectuses or other materials, if any, permitted by the 1933 Act or by
     the 1933 Act Regulations and approved by the U.S. Representatives.


                                          17
<PAGE>

     (b)  OFFICER'S CERTIFICATES.  Any certificate signed by any officer of Dura
or any  Subsidiary or SDC II, delivered to the Global Coordinator, the U.S.
Representatives or to counsel for the U.S. Underwriters shall be deemed a
representation and warranty by Dura or SDC II, as the case may be, to each U.S.
Underwriter as to the matters covered thereby.

     SECTION 2.  SALE AND DELIVERY TO U.S. UNDERWRITERS; CLOSING.

     (a)  INITIAL U.S. UNITS.  On the basis of the representations and
warranties herein contained and subject to the terms and conditions herein set
forth, the Companies, severally and not jointly, agree to sell to each U.S.
Underwriter, and each U.S. Underwriter, severally and not jointly, agrees to
purchase from the Companies, at the price per Unit set forth in Schedule B, the
number of Initial U.S. Units set forth in Schedule A opposite the name of such
U.S. Underwriter, plus any additional number of Initial U.S. Units that such
U.S. Underwriter may become obligated to purchase pursuant to the provisions of
Section 10 hereof.

     (b)  U.S. OPTION UNITS.  In addition, on the basis of the representations
and warranties herein contained and subject to the terms and conditions herein
set forth, the Companies, acting severally and not jointly, hereby grant an
option to the U.S. Underwriters, severally and not jointly, to purchase up to an
additional 660,000 Units at the same price per Unit set forth in Schedule B for
the Initial U.S. Units.  The option hereby granted will expire 30 days after the
date hereof and may be exercised in whole or in part from time to time only for
the purpose of covering over-allotments which may be made in connection with the
offering and distribution of the Initial U.S. Units upon notice by the Global
Coordinator to the Companies setting forth the number of U.S. Option Units as to
which the several U.S. Underwriters are then exercising the option and the time
and date of payment and delivery for such U.S. Option Units.  Any such time and
date of delivery (a "Date of Delivery") shall be determined by the Global
Coordinator, but shall not be later than seven full business days after the
exercise of said option, nor in any event prior to the Closing Time, as
hereinafter defined.  If the option is exercised as to all or any portion of the
U.S. Option Units, each of the U.S. Underwriters, acting severally and not
jointly, will purchase that proportion of the total number of U.S. Option Units
then being purchased which the number of Initial U.S. Units set forth in
Schedule A opposite the name of such U.S. Underwriter bears to the total number
of Initial U.S. Units, subject in each case to such adjustments as the Global
Coordinator in its discretion shall make to eliminate any sales or purchases of
fractional Units.

     (c)  PAYMENT.  Payment of the purchase price for, and delivery of
certificates for, the Initial U.S. Units shall be made at the offices of
Brobeck, Phleger & Harrison LLP, 550 West C Street, Suite 1300, San Diego,
California 92101, or at such other place as shall be agreed upon by the Global
Coordinator and the Companies, at 7:00 A.M. (California time) on the third
(fourth, if the pricing occurs after 4:30 P.M. (Eastern time) on any given day)
business day after the date hereof (unless postponed in accordance with the
provisions of Section 10), or such other time not later than ten business days
after such date as shall be agreed upon by the Global


                                          18
<PAGE>

Coordinator and the Companies (such time and date of payment and delivery being
herein called "Closing Time").

     In addition, in the event that any or all of the U.S. Option Units are
purchased by the U.S. Underwriters, payment of the purchase price for, and
delivery of certificates for, such U.S. Option Units shall be made at the
above-mentioned offices, or at such other place as shall be agreed upon by the
Global Coordinator and the Companies, on each Date of Delivery as specified in
the notice from the Global Coordinator to the Companies.

     Payment shall be made to the Companies by wire transfer of immediately
available funds to a bank account designated by the Companies against delivery
to the U.S. Representatives of certificates for the respective accounts of the
U.S. Underwriters of certificates for the U.S. Units to be purchased by them.
It is understood that each U.S. Underwriter has authorized the U.S.
Representatives, for its account, to accept delivery of, receipt for, and make
payment of the purchase price for, the Initial U.S. Units and the U.S. Option
Units, if any, that it has agreed to purchase.  Merrill Lynch, individually and
not as representative of the U.S. Underwriters, may (but shall not be obligated
to) make payment of the purchase price for the Initial U.S. Units or the U.S.
Option Units, if any, to be purchased by any U.S. Underwriter whose funds have
not been received by the Closing Time or the relevant Date of Delivery, as the
case may be, but such payment shall not relieve such U.S. Underwriter from its
obligations hereunder.

     (d)  DENOMINATIONS; REGISTRATION.  Certificates for the Initial U.S. Units
and the U.S. Option Units, if any, shall be in such denominations and registered
in such names as the U.S. Representatives may request in writing at least one
full business day before the Closing Time or the relevant Date of Delivery, as
the case may be.  The certificates for the Initial U.S. Units and the U.S.
Option Units, if any, will be made available for examination and packaging by
the U.S. Underwriters in The City of New York not later than 10:00 A.M. (Eastern
time) on the business day prior to the Closing Time or the relevant Date of
Delivery, as the case may be.

     SECTION 3.  COVENANTS OF THE COMPANIES.  Each of the Companies covenants
with each U.S. Underwriter as follows:

          (a)  COMPLIANCE WITH SECURITIES REGULATIONS AND COMMISSION REQUESTS.
     The Companies, subject to Section 3(b), will comply with the requirements
     of Rule 430A or Rule 434, as applicable, and will notify the Global
     Coordinator immediately, and confirm the notice in writing, (i) when any
     post-effective amendment to the Registration Statement shall become
     effective, or any supplement to the Prospectuses or any amended
     Prospectuses shall have been filed, (ii) of the receipt of any comments
     from the Commission, (iii) of any request by the Commission for any
     amendment to the Registration Statement or any amendment or supplement to
     the Prospectuses or for additional information and (iv) of the issuance by
     the Commission of any stop order suspending the effectiveness of the
     Registration Statement or of any order preventing or suspending the use of
     any preliminary prospectus, or of the suspension of the


                                          19
<PAGE>

     qualification of the Units for offering or sale in any jurisdiction, or of
     the initiation or threatening of any proceedings for any of such purposes.
     The Companies will promptly effect the filings necessary pursuant to Rule
     424(b) and will take such steps as they deem necessary to ascertain
     promptly whether the form of prospectus transmitted for filing under Rule
     424(b) was received for filing by the Commission and, in the event that it
     was not, will promptly file such prospectus.  The Companies will make every
     reasonable effort to prevent the issuance of any stop order and, if any
     stop order is issued, to obtain the lifting thereof at the earliest
     possible moment.

          (b)  FILING OF AMENDMENTS.  The Companies will give the Global
     Coordinator notice of their intention to file or prepare any amendment to
     the Registration Statement (including any filing under Rule 462(b)), any
     Term Sheet or any amendment, supplement or revision to either the
     prospectus included in the Registration Statement at the time it became
     effective or to the Prospectuses, whether pursuant to the 1933 Act, the
     1934 Act or otherwise, will furnish the Global Coordinator with copies of
     any such documents a reasonable amount of time prior to such proposed
     filing or use, as the case may be, and will not file or use any such
     document to which the Global Coordinator or counsel for the U.S.
     Underwriters shall object.

          (c)  DELIVERY OF REGISTRATION STATEMENT.  The Companies have furnished
     or will deliver to the U.S. Representatives and counsel for the U.S.
     Underwriters, without charge, signed copies of the Registration Statement
     as originally filed and of each amendment thereto (including exhibits filed
     therewith or incorporated by reference therein and documents incorporated
     or deemed to be incorporated by reference therein) and signed copies of all
     consents and certificates of experts, and will also deliver to the U.S.
     Representatives, without charge, a conformed copy of the Registration
     Statement as originally filed and of each amendment thereto (without
     exhibits) for each of the U.S. Underwriters.  The copies of the
     Registration Statement and each amendment thereto furnished to the U.S.
     Underwriters will be identical to the electronically transmitted copies
     thereof filed with the Commission pursuant to EDGAR, except to the extent
     permitted by Regulation S-T.

          (d)  DELIVERY OF PROSPECTUSES.  The Companies have delivered to each
     U.S. Underwriter, without charge, as many copies of each preliminary
     prospectus as such U.S. Underwriter reasonably requested, and the Companies
     hereby consent to the use of such copies for purposes permitted by the 1933
     Act.  The Companies will furnish to each U.S. Underwriter, without charge,
     during the period when the U.S. Prospectus is required to be delivered
     under the 1933 Act or the 1934 Act, such number of copies of the U.S.
     Prospectus (as amended or supplemented) as such U.S. Underwriter may
     reasonably request.  The U.S. Prospectus and any amendments or supplements
     thereto furnished to the U.S. Underwriters will be identical to the
     electronically transmitted copies thereof filed with the Commission
     pursuant to EDGAR, except to the extent permitted by Regulation S-T.


                                          20
<PAGE>

          (e)  CONTINUED COMPLIANCE WITH SECURITIES LAWS.  The Companies will
     comply with the 1933 Act and the 1933 Act Regulations and the 1934 Act and
     the 1934 Act Regulations so as to permit the completion of the distribution
     of the Units as contemplated in this Agreement, the International Purchase
     Agreement and in the Prospectuses.  If at any time when a prospectus is
     required by the 1933 Act to be delivered in connection with sales of the
     Units, any event shall occur or condition shall exist as a result of which
     it is necessary, in the opinion of counsel for the U.S. Underwriters or for
     the Companies, to amend the Registration Statement or amend or supplement
     any Prospectus in order that the Prospectuses will not include any untrue
     statements of a material fact or omit to state a material fact necessary in
     order to make the statements therein not misleading in the light of the
     circumstances existing at the time any such Prospectus is delivered to a
     purchaser, or if it shall be necessary, in the opinion of such counsel, at
     any such time to amend the Registration Statement or amend or supplement
     any Prospectus in order to comply with the requirements of the 1933 Act or
     the 1933 Act Regulations, the Companies will promptly prepare and file with
     the Commission, subject to Section 3(b), such amendment or supplement as
     may be necessary to correct such statement or omission or to make the
     Registration Statement or the Prospectuses comply with such requirements,
     and the Companies will furnish to the U.S. Underwriters such number of
     copies of such amendment or supplement as the U.S. Underwriters may
     reasonably request.

          (f)  RULE 158.  The Companies will timely file such reports pursuant
     to the 1934 Act as are necessary in order to make generally available to
     their securityholders as soon as practicable an earnings statement for the
     purposes of, and to provide the benefits contemplated by, the last
     paragraph of Section 11(a) of the 1933 Act.

          (g)  USE OF PROCEEDS.  SDC II will use the net proceeds received by it
     from the sale of the Units in the manner specified in the Prospectuses
     under "Use of Proceeds".

          (h)  LISTING.  The Companies will use their best efforts to effect and
     maintain the quotation of the Units on the Nasdaq National Market and will
     file with the Nasdaq National Market all documents and notices required by
     the Nasdaq National Market of companies that have securities that are
     traded in the over-the-counter market and quotations for which are reported
     by the Nasdaq National Market.

          (i)  RESTRICTION ON SALE OF DURA COMMON STOCK.  During a period of 90
     days from the date of the Prospectuses, Dura will not, without the prior
     written consent of the Global Coordinator, (i) directly or indirectly,
     offer, pledge, sell, contract to sell, sell any option or contract to
     purchase, purchase any option or contract to sell, grant any option, right
     or warrant to purchase or otherwise transfer or dispose of any shares of
     Dura Common Stock or any securities convertible into or exercisable or
     exchangeable for shares of Dura Common Stock or file any registration
     statement under the 1933 Act with respect to any of the foregoing or
     (ii) enter into any swap or any other agreement or any


                                          21
<PAGE>

     transaction that transfers, in whole or in part, directly or indirectly,
     the economic consequence of ownership of Dura Common Stock whether any such
     swap or transaction described in clause (i) or (ii) above is to be settled
     by delivery of shares of Dura Common Stock or such other securities, in
     cash or otherwise.  The foregoing sentence shall not apply to (A) the Units
     to be sold hereunder or under the International Purchase Agreement, (B) any
     shares of Dura Common Stock issued by Dura upon the exercise of an option
     or warrant or the conversion of a security outstanding on the date hereof
     and referred to in, or incorporated by reference into, the Prospectuses,
     (C) any shares of Dura Common Stock issued or options to purchase Dura
     Common Stock granted pursuant to existing employee benefit plans of Dura
     referred to in, or incorporated by reference into, the Prospectuses or (D)
     any shares of Dura Common Stock issued to stockholders of SDC in connection
     with the acquisition of all of the outstanding stock of SDC pursuant to a
     registration statement on Form S-3 filed with the Commission on October 15,
     1997, as amended (No. 333-37955).

          (j)  REPORTING REQUIREMENTS. The Companies, during the period when the
     Prospectuses are required to be delivered under the 1933 Act or the 1934
     Act, will file all documents required to be filed with the Commission
     pursuant to the 1934 Act within the time periods required by the 1934 Act
     and the 1934 Act Regulations.

          (k)  COMPLIANCE WITH NASD RULES.  The Companies hereby agree to
     cooperate with the U.S. Underwriters to ensure that the Reserved Units will
     be restricted as required by the National Association of Securities
     Dealers, Inc. (the "NASD") or the NASD rules from sale, transfer,
     assignment, pledge or hypothecation for a period of three months following
     the date of this Agreement. After such time as they have been notified in
     writing by the U.S. Underwriters as to which persons will need to be so
     restricted, the Companies will use their best efforts to direct the
     transfer agent or such other applicable person to place a stop transfer
     restriction upon such securities for such period of time.  Should the
     Companies release, or seek to release, from such restrictions any of the
     Reserved Units, the Companies agree to reimburse the U.S. Underwriters for
     any reasonable expenses (including, without limitation, legal expenses)
     they incur in connection with such release.

          (l)  LOCK-UP AGREEMENTS.  SDC II will cause each person that becomes a
     director or officer within 90 days of the date hereof to deliver an
     agreement substantially in the form of Exhibit D hereto.

     SECTION 4.     PAYMENT OF EXPENSES.

     (a)  EXPENSES. SDC II will pay or cause to be paid all expenses incident to
the performance of the Companies' obligations under this Agreement, including
(i) the preparation, printing and filing of the Registration Statement
(including financial statements and exhibits) as originally filed and of each
amendment thereto, (ii) the preparation, printing and delivery to the
Underwriters of this Agreement, any Agreement among Underwriters, the Warrant
Agreement


                                          22
<PAGE>

and such other documents as may be required in connection with the offering,
purchase, sale, issuance or delivery of the Units, (iii) the preparation,
issuance and delivery of the certificates for the Units to the Underwriters,
including any stock or other transfer taxes and any stamp or other duties
payable upon the sale, issuance or delivery of the Units to the Underwriters and
the transfer of the Units between the U.S. Underwriters and the Managers,
(iv) the fees and disbursements of the Companies' counsel, accountants and other
advisors, (v) the fees and disbursements of SDC's counsel, accountants and other
advisors, (vi) the printing and delivery to the Underwriters of copies of each
preliminary prospectus, any Term Sheets and of the Prospectuses and any
amendments or supplements thereto, (vii) the preparation, printing and delivery
to the Underwriters of copies of the Blue Sky Survey and any supplement thereto,
(viii) the fees and expenses of any transfer agent or registrar for the Units,
(ix) all charges of the Warrant Agent, (x) the filing fees incident to, and the
reasonable fees and disbursements of counsel to the Underwriters in connection
with, the review by the NASD of the terms of the sale of the Units, (xi) the
fees and expenses incurred in connection with the listing of the Units, the
SDC II Common Stock and the Warrants on the Nasdaq National Market and (xii) all
costs and expenses of the U.S. Underwriters, including the fees and
disbursements of counsel for the U.S. Underwriters, in connection with matters
related to the Reserved Units that are designated by the Companies for sale to
employees and others having a business relationship with the Companies; PROVIDED
that the Underwriters will reimburse SDC II for up to $1,140,000 of expenses
incurred in connection with the Offerings.

     (b)  TERMINATION OF AGREEMENT.  If this Agreement is terminated by the U.S.
Representatives in accordance with the provisions of Section 5, Section 9(a)(i)
or Section 11, the Companies shall reimburse the U.S. Representatives for all of
their out-of-pocket expenses, including the reasonable fees and disbursements of
counsel for the U.S. Underwriters.

     SECTION 5.     CONDITIONS OF U.S. UNDERWRITERS' OBLIGATIONS.  The
obligations of the several  U.S. Underwriters hereunder are subject to the
accuracy of the representations and warranties of the Companies contained in
Section 1 hereof or in certificates of any officer of the Companies or any
Subsidiary delivered pursuant to the provisions hereof, to the performance by
the Companies of their covenants and other obligations hereunder, and to the
following further conditions:

          (a)  EFFECTIVENESS OF REGISTRATION STATEMENT.  The Registration
     Statement, including any Rule 462(b) Registration Statement has become
     effective and at Closing Time no stop order suspending the effectiveness of
     the Registration Statement shall have been issued under the 1933 Act or
     proceedings therefor initiated or threatened by the Commission, and any
     request on the part of the Commission for additional information shall have
     been complied with to the reasonable satisfaction of counsel to the U.S.
     Underwriters.  A prospectus containing the Rule 430A Information shall have
     been filed with the Commission in accordance with Rule 424(b) (or a
     post-effective amendment providing such information shall have been filed
     and declared effective in accordance with the requirements of Rule 430A)
     or, if the Companies have elected to rely upon Rule


                                          23
<PAGE>

     434, a Term Sheet shall have been filed with the Commission in accordance
     with Rule 424(b).

          (b)  OPINION OF COUNSEL FOR THE COMPANIES.  At Closing Time, the U.S.
     Representatives shall have received the favorable opinion, dated as of
     Closing Time, of Brobeck, Phleger & Harrison LLP, counsel for Dura and SDC
     II, in form and substance satisfactory to counsel for the U.S.
     Underwriters, and, to the extent provided in Exhibit A hereto, Mitchell R.
     Woodbury, General Counsel for Dura, together with signed or reproduced
     copies of such letters for each of the other U.S. Underwriters, to the
     effect set forth in Exhibit A hereto.

          (c)  OPINION OF PATENT COUNSEL FOR THE COMPANIES.  At Closing Time,
     the U.S. Representatives shall have received the favorable opinion, dated
     as of Closing Time, of Lyon & Lyon LLP (solely with respect to patents
     concerning the Spiros products), patent counsel for the Companies, in form
     and substance satisfactory to counsel for the U.S. Underwriters, together
     with signed or reproduced copies of such letter for each of the other U.S.
     Underwriters, to the effect set forth in Exhibit B hereto.

          (d)  OPINION OF REGULATORY COUNSEL FOR THE COMPANIES.  At Closing
     Time, the U.S. Representatives shall have received the favorable opinion,
     dated as of Closing Time, of Kleinfeld, Kaplan and Becker, regulatory
     counsel for the Companies, in form and substance satisfactory to counsel
     for the U.S. Underwriters, together with signed or reproduced copies of
     such letter for each of the other U.S. Underwriters, to the effect set
     forth in Exhibit C hereto.

          (e)  OPINION OF COUNSEL FOR THE U.S. UNDERWRITERS.  At Closing Time,
     the U.S. Representatives shall have received the favorable opinion, dated
     as of Closing Time, of Shearman & Sterling, counsel for the U.S.
     Underwriters, together with signed or reproduced copies of such letter for
     each of the other U.S. Underwriters, with respect to such matters as the
     U.S. Underwriters may reasonably request.  In giving such opinion, such
     counsel may rely, as to all matters governed by the laws of jurisdictions
     other than the law of the State of New York and the federal law of the
     United States upon the opinions of counsel satisfactory to the U.S.
     Representatives.  Such counsel may also state that, insofar as such opinion
     involves factual matters, they have relied, to the extent they deem proper,
     upon certificates of officers of the Companies and the Subsidiaries and
     certificates of public officials.

          (f)  OFFICERS' CERTIFICATE.  At Closing Time, there shall not have
     been, since the date hereof or since the respective dates as of which
     information is given in the Prospectuses, any Dura Material Adverse Effect,
     SDC Material Adverse Effect or SDC II Material Adverse Effect, whether or
     not arising in the ordinary course of business, and the U.S.
     Representatives shall have received a certificate of the President or a
     Vice President of Dura and of the chief financial or chief accounting
     officer of Dura, and the President or a Vice President of SDC II and of the
     chief financial or chief accounting


                                          24
<PAGE>

     officer of SDC II, dated as of the Closing Time, to the effect that
     (i) there has been no such material adverse effect, (ii) the
     representations and warranties of Dura and SDC II set forth in Section 1(a)
     hereof are true and correct with the same force and effect as though
     expressly made at and as of the Closing Time, (iii) each of Dura and SDC II
     shall have complied with all agreements and satisfied all conditions on its
     part to be performed or satisfied at or prior to Closing Time, and (iv) no
     stop order suspending the effectiveness of the Registration Statement has
     been issued and no proceedings for that purpose have been instituted or are
     pending or are contemplated by the Commission.

          (g)  ACCOUNTANTS' COMFORT LETTER.  At the time of the execution of
     this Agreement, the U.S. Representatives shall have received from Deloitte
     & Touche LLP a letter, dated such date, in form and substance satisfactory
     to the U.S. Representatives, together with signed or reproduced copies of
     such letter for each of the other U.S. Underwriters, containing statements
     and information of the type ordinarily included in accountants' "comfort
     letters" to underwriters with respect to the financial statements and
     certain financial information contained in the Registration Statement and
     the Prospectuses.

          (h)  BRING-DOWN COMFORT LETTER.  At Closing Time, the U.S.
     Representatives shall have received from Deloitte & Touche LLP a letter,
     dated as of Closing Time, to the effect that they reaffirm the statements
     made in the letter furnished pursuant to subsection (g) of this Section 5,
     except that the specified date referred to shall be a date not more than
     three business days prior to Closing Time.

          (i)  APPROVAL OF LISTING.  At Closing Time, the Units shall have been
     approved for inclusion in the Nasdaq National Market, subject only to
     official notice of issuance.

          (j)  NO OBJECTION.  The NASD has confirmed that it has not raised any
     objection with respect to the fairness and reasonableness of the
     underwriting terms and arrangements.

          (k)  LOCK-UP AGREEMENTS.  At the date of this Agreement, the U.S.
     Underwriters shall have received an agreement substantially in the form of
     Exhibit D hereto signed by the persons listed on Schedule C hereto.

          (l)  PURCHASE OF INITIAL INTERNATIONAL UNITS.  Contemporaneously with
     the purchase by the U.S. Underwriters of the Initial U.S. Units under this
     Agreement, the Managers shall have purchased the Initial International
     Units under the International Purchase Agreement.

          (m)  CONDITIONS TO PURCHASE OF U.S. OPTION UNITS.  In the event that
     the U.S. Underwriters exercise their option provided in Section 2(b) hereof
     to purchase all or any portion of the U.S. Option Units, the
     representations and warranties of the Companies contained herein and the
     statements in any certificates furnished by the Companies and


                                          25
<PAGE>

     any Subsidiary hereunder shall be true and correct as of each Date of
     Delivery and, at the relevant Date of Delivery, the U.S. Representatives
     shall have received:

               (i)       OFFICERS' CERTIFICATE.  A certificate, dated such Date
          of Delivery, of the President or a Vice President of each of the
          Companies and of the chief financial or chief accounting officer of
          each of the Companies confirming that the certificate delivered at the
          Closing Time pursuant to Section 5(f) remains true and correct as of
          such Date of Delivery.

               (ii)      OPINIONS OF COUNSEL FOR THE COMPANIES.  The favorable
          opinions of Brobeck, Phleger & Harrison LLP, counsel for the
          Companies, Lyon & Lyon, patent counsel for the Companies, and
          Kleinfeld, Kaplan and Becker, regulatory counsel for the Companies,
          each in form and substance satisfactory to counsel for the U.S.
          Underwriters, dated such Date of Delivery, relating to the U.S. Option
          Units to be purchased on such Date of Delivery and otherwise to the
          same effect as the opinions required by Sections 5(b), 5(c) and 5(d).

               (iii)     OPINION OF COUNSEL FOR THE U.S. UNDERWRITERS.  The
          favorable opinion of Shearman & Sterling, counsel for the U.S.
          Underwriters, dated such Date of Delivery, relating to the U.S. Option
          Units to be purchased on such Date of Delivery and otherwise to the
          same effect as the opinion required by Section 5(e).

               (iv)      BRING-DOWN COMFORT LETTER.  A letter from Deloitte &
          Touche LLP, in form and substance satisfactory to the U.S.
          Representatives and dated such Date of Delivery, substantially in the
          same form and substance as the letter furnished to the U.S.
          Representatives pursuant to Section 5(h), except that the "specified
          date" in the letter furnished pursuant to this paragraph shall be a
          date not more than five days prior to such Date of Delivery.

          (n)  ADDITIONAL DOCUMENTS.  At Closing Time and at each Date of
     Delivery, counsel for the U.S. Underwriters shall have been furnished with
     such documents and opinions as they may require for the purpose of enabling
     them to pass upon the issuance and sale of the Units as herein
     contemplated, or in order to evidence the accuracy of any of the
     representations or warranties, or the fulfillment of any of the conditions,
     herein contained; and all proceedings taken by the Companies in connection
     with the issuance and sale of the Units as herein contemplated shall be
     reasonably satisfactory in form and substance to the U.S. Representatives
     and counsel for the U.S. Underwriters.

          (o)  TERMINATION OF AGREEMENT.  If any condition specified in this
     Section 5 shall not have been fulfilled when and as required to be
     fulfilled, this Agreement, or, in the case of any condition to the purchase
     of U.S. Option Units, on a Date of Delivery which is after the Closing
     Time, the obligations of the U.S. Underwriters to purchase the relevant
     U.S. Option Units, may be terminated by the U.S. Representatives by notice
     to


                                          26
<PAGE>

     the Companies at any time at or prior to Closing Time or such Date of
     Delivery, as the case may be, and such termination shall be without
     liability of any party to any other party except as provided in Section 4
     and except that Sections 1, 6, 7 and 8 shall survive any such termination
     and remain in full force and effect.

     SECTION 6.     INDEMNIFICATION.

     (a)  INDEMNIFICATION OF U.S. UNDERWRITERS.  The Companies, jointly and
severally, agree to indemnify and hold harmless each U.S. Underwriter and each
person, if any, who controls any U.S. Underwriter within the meaning of
Section 15 of the 1933 Act or Section 20 of the 1934 Act as follows:

          (i)    against any and all loss, liability, claim, damage and expense
     whatsoever, as incurred, arising out of any untrue statement or alleged
     untrue statement of a material fact contained in the Registration Statement
     (or any amendment thereto), including the Rule 430A Information and the
     Rule 434 Information, if applicable, or the omission or alleged omission
     therefrom of a material fact required to be stated therein or necessary to
     make the statements therein not misleading or arising out of any untrue
     statement or alleged untrue statement of a material fact included in any
     preliminary prospectus or the Prospectuses (or any amendment or supplement
     thereto), or the omission or alleged omission therefrom of a material fact
     necessary in order to make the statements therein, in the light of the
     circumstances under which they were made, not misleading;

          (ii)   against any and all loss, liability, claim, damage and expense
     whatsoever, as incurred, to the extent of the aggregate amount paid in
     settlement of any litigation, or any investigation or proceeding by any
     governmental agency or body, commenced or threatened, or of any claim
     whatsoever based upon any such untrue statement or omission, or any such
     alleged untrue statement or omission; provided that (subject to Section
     6(d) below) any such settlement is effected with the written consent of the
     Companies; and

          (iii)  against any and all expense whatsoever, as incurred (including
     the fees and disbursements of counsel chosen by Merrill Lynch), reasonably
     incurred in investigating, preparing or defending against any litigation,
     or any investigation or proceeding by any governmental agency or body,
     commenced or threatened, or any claim whatsoever based upon any such untrue
     statement or omission, or any such alleged untrue statement or omission, to
     the extent that any such expense is not paid under (i) or (ii) above;

PROVIDED, HOWEVER, that this indemnity agreement shall not apply to any loss,
liability, claim, damage or expense to the extent arising out of any untrue
statement or omission or alleged untrue statement or omission made in reliance
upon and in conformity with written information furnished to the Companies by
any U.S. Underwriter through the U.S. Representatives expressly for use in the
Registration Statement (or any amendment thereto), including the Rule 430A


                                          27
<PAGE>

Information and the Rule 434 Information, if applicable, or any preliminary
prospectus or the U.S. Prospectus (or any amendment or supplement thereto).

     (b)  INDEMNIFICATION OF THE COMPANIES, DIRECTORS AND OFFICERS.  Each U.S.
Underwriter severally agrees to indemnify and hold harmless the Companies, their
directors, each of their officers who signed the Registration Statement, and
each person, if any, who controls either of the Companies within the meaning of
Section 15 of the 1933 Act or Section 20 of the 1934 Act, against any and all
loss, liability, claim, damage and expense described in the indemnity contained
in subsection (a) of this Section 6, as incurred, but only with respect to
untrue statements or omissions, or alleged untrue statements or omissions, made
in the Registration Statement (or any amendment thereto), including the Rule
430A Information and the Rule 434 Information, if applicable, or any preliminary
U.S. prospectus or the U.S. Prospectus (or any amendment or supplement thereto)
in reliance upon and in conformity with written information furnished to the
Companies by such U.S. Underwriter through the U.S. Representatives expressly
for use in the Registration Statement (or any amendment thereto) or such
preliminary prospectus or the U.S. Prospectus (or any amendment or supplement
thereto).

     (c)  ACTIONS AGAINST PARTIES; NOTIFICATION.  Each indemnified party shall
give notice as promptly as reasonably practicable to each indemnifying party of
any action commenced against it in respect of which indemnity may be sought
hereunder, but failure to so notify an indemnifying party shall not relieve such
indemnifying party from any liability hereunder to the extent it is not
materially prejudiced as a result thereof and in any event shall not relieve it
from any liability which it may have otherwise than on account of this indemnity
agreement.  In the case of parties indemnified pursuant to Section 6(a) above,
counsel to the indemnified parties shall be selected by Merrill Lynch, and, in
the case of parties indemnified pursuant to Section 6(b) above, counsel to the
indemnified parties shall be selected by the Companies.  An indemnifying party
may participate at its own expense in the defense of any such action; PROVIDED,
HOWEVER, that counsel to the indemnifying party shall not (except with the
consent of the indemnified party) also be counsel to the indemnified party.  In
no event shall the indemnifying parties be liable for fees and expenses of more
than one counsel (in addition to any local counsel) separate from their own
counsel for all indemnified parties in connection with any one action or
separate but similar or related actions in the same jurisdiction arising out of
the same general allegations or circumstances.  No indemnifying party shall,
without the prior written consent of the indemnified parties, settle or
compromise or consent to the entry of any judgment with respect to any
litigation, or any investigation or proceeding by any governmental agency or
body, commenced or threatened, or any claim whatsoever in respect of which
indemnification or contribution could be sought under this Section 6 or Section
7 hereof (whether or not the indemnified parties are actual or potential parties
thereto), unless such settlement, compromise or consent (i) includes an
unconditional release of each indemnified party from all liability arising out
of such litigation, investigation, proceeding or claim and (ii) does not include
a statement as to or an admission of fault, culpability or a failure to act by
or on behalf of any indemnified party.


                                          28
<PAGE>

     (d)  SETTLEMENT WITHOUT CONSENT IF FAILURE TO REIMBURSE.  If at any time an
indemnified party shall have requested an indemnifying party to reimburse the
indemnified party for fees and expenses of counsel, such indemnifying party
agrees that it shall be liable for any settlement of the nature contemplated by
Section 6(a) effected without its written consent if (i) such settlement is
entered into more than 45 days after receipt by such indemnifying party of the
aforesaid request, (ii) such indemnifying party shall have received notice of
the terms of such settlement at least 30 days prior to such settlement being
entered into and (iii) such indemnifying party shall not have reimbursed such
indemnified party in accordance with such request prior to the date of such
settlement.

     (e)  INDEMNIFICATION FOR RESERVED UNITS.  In connection with the offer and
sale of the Reserved Units, the Companies agree, promptly upon a request in
writing, to indemnify and hold harmless the U.S. Underwriters from and against
any and all losses, liabilities, claims, damages and expenses incurred by them
as a result of the failure of eligible directors, officers, employees, business
associates and related persons of the Companies to pay for and accept delivery
of Reserved Units which, by the end of the first business day following the date
of this Agreement, were subject to a properly confirmed agreement to purchase.

     SECTION 7.     CONTRIBUTION.  If the indemnification provided for in
Section 6 hereof is for any reason unavailable to or insufficient to hold
harmless an indemnified party in respect of any losses, liabilities, claims,
damages or expenses referred to therein, then each indemnifying party shall
contribute to the aggregate amount of such losses, liabilities, claims, damages
and expenses incurred by such indemnified party, as incurred, (i) in such
proportion as is appropriate to reflect the relative benefits received by the
Companies on the one hand and the U.S. Underwriters on the other hand from the
offering of the Units pursuant to this Agreement or (ii) if the allocation
provided by clause (i) 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 Companies on the one hand and of
the U.S. Underwriters on the other hand in connection with the statements or
omissions that resulted in such losses, liabilities, claims, damages or
expenses, as well as any other relevant equitable considerations.

     The relative benefits received by the Companies on the one hand and the
U.S. Underwriters on the other hand in connection with the offering of the Units
pursuant to this Agreement shall be deemed to be in the same respective
proportions as the total net proceeds from the offering of the Units pursuant to
this Agreement (before deducting expenses) received by the Companies and the
total underwriting discount received by the U.S. Underwriters, in each case as
set forth on the cover of the U.S. Prospectus, or, if Rule 434 is used, the
corresponding location on the Term Sheet, bear to the aggregate initial public
offering price of the Units as set forth on such cover.

     The relative fault of the Companies on the one hand and the U.S.
Underwriters on the other hand shall be determined by reference to, among other
things, whether any such untrue or alleged untrue statement of a material fact
or omission or alleged omission to state a material fact relates to information
supplied by the Companies or by the U.S. Underwriters and the


                                          29
<PAGE>

parties' relative intent, knowledge, access to information and opportunity to
correct or prevent such statement or omission.

     The Companies and the U.S. Underwriters agree that it would not be just and
equitable if contribution pursuant to this Section 7 were determined by pro rata
allocation (even if the U.S. Underwriters were treated as one entity for such
purpose) or by any other method of allocation which does not take account of the
equitable considerations referred to above in this Section 7.  The aggregate
amount of losses, liabilities, claims, damages and expenses incurred by an
indemnified party and referred to above in this Section 7 shall be deemed to
include any legal or other expenses reasonably incurred by such indemnified
party in investigating, preparing or defending against any litigation, or any
investigation or proceeding by any governmental agency or body, commenced or
threatened, or any claim whatsoever based upon any such untrue or alleged untrue
statement or omission or alleged omission.

     Notwithstanding the provisions of this Section 7, no U.S. Underwriter shall
be required to contribute any amount in excess of the amount by which the total
price at which the Units underwritten by it and distributed to the public were
offered to the public exceeds the amount of any damages which such U.S.
Underwriter has otherwise been required to pay by reason of any such untrue or
alleged untrue statement or omission or alleged omission.

     No person guilty of fraudulent misrepresentation (within the meaning of
Section 11(f) of the 1933 Act) shall be entitled to contribution from any person
who was not guilty of such fraudulent misrepresentation.

     For purposes of this Section 7, each person, if any, who controls a U.S.
Underwriter within the meaning of Section 15 of the 1933 Act or Section 20 of
the 1934 Act shall have the same rights to contribution as such U.S.
Underwriter, and each director of each of the Companies, each officer of each of
the Companies who signed the Registration Statement, and each person, if any,
who controls the Companies within the meaning of Section 15 of the 1933 Act or
Section 20 of the 1934 Act shall have the same rights to contribution as the
Companies.  The U.S. Underwriters' respective obligations to contribute pursuant
to this Section are several in proportion to the number of Initial U.S. Units
set forth opposite their respective names in Schedule A hereto and not joint.

     SECTION 8.     REPRESENTATIONS, WARRANTIES AND AGREEMENTS TO SURVIVE
DELIVERY.  All representations, warranties and agreements contained in this
Agreement or in certificates of officers of the Companies or any Subsidiary
submitted pursuant hereto, shall remain operative and in full force and effect,
regardless of any investigation made by or on behalf of any U.S. Underwriter or
controlling person, or by or on behalf of the Companies, and shall survive
delivery of the Units to the U.S. Underwriters.


                                          30
<PAGE>

     SECTION 9.     TERMINATION OF AGREEMENT.

     (a)  TERMINATION; GENERAL.  The U.S. Representatives may terminate this
Agreement, by notice to the Companies, at any time at or prior to Closing Time
(i) if there has been, since the time of execution of this Agreement or since
the respective dates as of which information is given in the U.S. Prospectus,
any Dura Material Adverse Effect or any SDC II Material Adverse Effect,  whether
or not arising in the ordinary course of business, or (ii) if there has occurred
any material adverse change in the financial markets in the United States or the
international financial markets, any outbreak of hostilities or escalation
thereof or other calamity or crisis or any change or development involving a
prospective change in national or international political, financial or economic
conditions, in each case the effect of which is such as to make it, in the
judgment of the U.S. Representatives, impracticable to market the Units or to
enforce contracts for the sale of the Units, or (iii) if trading in any
securities of the Companies has been suspended or materially limited by the
Commission or the Nasdaq National Market, or if trading generally on the
American Stock Exchange or the New York Stock Exchange or in the Nasdaq National
Market has been suspended or materially limited, or minimum or maximum prices
for trading have been fixed, or maximum ranges for prices have been required, by
any of said exchanges or by such system or by order of the Commission, the NASD
or any other governmental authority, or (iv) if a banking moratorium has been
declared by either Federal or New York or California authorities.

     (b)  LIABILITIES.  If this Agreement is terminated pursuant to this Section
9, such termination shall be without liability of any party to any other party
except as provided in Section 4 hereof, and provided further that Sections 1, 6,
7 and 8 shall survive such termination and remain in full force and effect.

     SECTION 10.  DEFAULT BY ONE OR MORE OF THE U.S. UNDERWRITERS.  If one or
more of the U.S. Underwriters shall fail at Closing Time or a Date of Delivery
to purchase the Units which it or they are obligated to purchase under this
Agreement (the "Defaulted Units"), the U.S. Representatives shall have the
right, within 24 hours thereafter, to make arrangements for one or more of the
non-defaulting U.S. Underwriters, or any other underwriters, to purchase all,
but not less than all, of the Defaulted Units in such amounts as may be agreed
upon and upon the terms herein set forth; if, however, the U.S. Representatives
shall not have completed such arrangements within such 24-hour period, then:

          (a)  if the number of Defaulted Units does not exceed 10% of the
     number of Units to be purchased on such date, the non-defaulting U.S.
     Underwriters shall be obligated, each severally and not jointly, to
     purchase the full amount thereof in the proportions that their respective
     underwriting obligations hereunder bear to the underwriting obligations of
     all non-defaulting U.S. Underwriters, or

          (b)  if the number of Defaulted Units exceeds 10% of the number of
     Units to be purchased on such date, this Agreement or, with respect to any
     Date of Delivery which occurs after Closing Time, the obligation of the
     U.S. Underwriters to purchase


                                          31
<PAGE>

     and of the Companies to sell the U.S. Option Units to be purchased and sold
     on such Date of Delivery shall terminate without liability on the part of
     any non-defaulting U.S. Underwriter.

     No action taken pursuant to this Section 10 shall relieve any defaulting
U.S. Underwriter from liability in respect of its default.

     In the event of any such default which does not result in a termination of
this Agreement or, in the case of a Date of Delivery which is after Closing
Time, which does not result in a termination of the obligation of the U.S.
Underwriters to purchase and the Companies to sell the relevant U.S. Option
Units, as the case may be, either the U.S. Representatives or the Companies
shall have the right to postpone Closing Time or the relevant Date of Delivery,
as the case may be, for a period not exceeding seven days in order to effect any
required changes in the Registration Statement or Prospectuses or in any other
documents or arrangements.  As used herein, the term "U.S. Underwriter" includes
any person substituted for a U.S. Underwriter under this Section.

     SECTION 11.  DEFAULT BY THE COMPANIES.  If the Companies shall fail at
Closing Time or at the Date of Delivery to sell the number of Units that they
are obligated to sell hereunder, then this Agreement shall terminate without any
liability on the part of any nondefaulting party; PROVIDED, HOWEVER, that the
provisions of Sections 1, 4, 6, 7 and 8 shall remain in full force and effect.
No action taken pursuant to this Section 11 shall relieve the Companies from
liability, if any, in respect of such default.

     SECTION 12.  NOTICES.  All notices and other communications hereunder shall
be in writing and shall be deemed to have been duly given if mailed or
transmitted by any standard form of telecommunication.  Notices to the U.S.
Underwriters shall be directed to the U.S. Representatives at North Tower, World
Financial Center, New York, New York 10281, attention of Cara Londin; notices to
either of the Companies shall be directed to them at:

                    Dura Pharmaceuticals, Inc.
                    7475 Lusk Boulevard
                    San Diego, California  92121-4204
                    Attn:  Mitchell R. Woodbury

     with a copy to:

                    Brobeck, Phleger & Harrison LLP
                    550 West "C" Street, Suite 1300
                    San Diego, California  92101
                    Attn:  Faye H. Russell

     SECTION 13.  PARTIES.  This Agreement shall inure to the benefit of and be
binding upon the U.S. Underwriters and the Companies and their respective
successors.  Nothing expressed


                                          32
<PAGE>

or mentioned in this Agreement is intended or shall be construed to give any
person, firm or corporation, other than the U.S. Underwriters and the Companies
and their respective successors and the controlling persons and officers and
directors referred to in Sections 6 and 7 and their heirs and legal
representatives, any legal or equitable right, remedy or claim under or in
respect of this Agreement or any provision herein contained.  This Agreement and
all conditions and provisions hereof are intended to be for the sole and
exclusive benefit of the U.S. Underwriters and the Companies and their
respective successors, and said controlling persons and officers and directors
and their heirs and legal representatives, and for the benefit of no other
person, firm or corporation.  No purchaser of Units from any U.S. Underwriter
shall be deemed to be a successor by reason merely of such purchase.

     SECTION 14.   GOVERNING LAW AND TIME.  THIS AGREEMENT SHALL BE GOVERNED BY
AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK.  EXCEPT AS
OTHERWISE SET FORTH HEREIN, SPECIFIED TIMES OF DAY REFER TO NEW YORK CITY TIME.

     SECTION 15.   EFFECT OF HEADINGS.  The Article and Section headings herein
and the Table of Contents are for convenience only and shall not affect the
construction hereof.


                                          33
<PAGE>

     If the foregoing is in accordance with your understanding of our agreement,
please sign and return to each of Dura and SDC II a counterpart hereof,
whereupon this instrument, along with all counterparts, will become a binding
agreement among the U.S. Underwriters, Dura and SDC II in accordance with its
terms.

                              Very truly yours,

                              DURA PHARMACEUTICALS, INC.


                              By:  /s/ Cam L. Garner
                                   ----------------------------------
                                     Title: Chairman, President & CEO

                              SPIROS DEVELOPMENT CORPORATION II, INC.


                              By:  /s/ David S. Kabakoff
                                   ----------------------------------
                                     Title: Chairman, President & CEO


CONFIRMED AND ACCEPTED,
     as of the date first above written:


MERRILL LYNCH & CO.
MERRILL LYNCH, PIERCE, FENNER & SMITH
                   INCORPORATED

DONALDSON, LUFKIN & JENRETTE SECURITIES CORPORATION

By:  MERRILL LYNCH, PIERCE, FENNER & SMITH
                   INCORPORATED


By:  /s/ James J. Jackson, Vice President
     ------------------------------------
            Authorized Signatory


For themselves and as U.S. Representatives of the other U.S. Underwriters named
in Schedule A hereto.


                                          34
<PAGE>

                                     SCHEDULE A

                                                                  Number of
                                                                 Initial U.S.
      Name of U.S. Underwriter                                      Units
      ------------------------                                      -----

 Merrill Lynch, Pierce, Fenner & Smith
        Incorporated . . . . . . . . . . . . . . . . . . . . .     1,500,000
 Donaldson, Lufkin & Jenrette Securities Corporation . . . . .     1,500,000
 BT Alex. Brown Incorporated . . . . . . . . . . . . . . . . .       200,000
 BancAmerica Robertson Stephens  . . . . . . . . . . . . . . .       200,000
 William Blair & Company . . . . . . . . . . . . . . . . . . .       200,000
 CIBC Oppenheimer Corp.  . . . . . . . . . . . . . . . . . . .       200,000
 Hambrecht & Quist LLC . . . . . . . . . . . . . . . . . . . .       200,000
 Nations Banc Montgomery Securities, Inc.  . . . . . . . . . .       200,000
 Piper Jaffrey, Inc. . . . . . . . . . . . . . . . . . . . . .       200,000
                                                                  ----------
 Total . . . . . . . . . . . . . . . . . . . . . . . . . . . .     4,400,000
                                                                  ----------
                                                                  ----------


                                      Sch A - 1
<PAGE>

                                      SCHEDULE B


                       SPIROS DEVELOPMENT CORPORATION II, INC.
                              DURA PHARMACEUTICALS, INC.

                                   4,400,000 Units
                              Each Unit Consisting of
   One Share of Callable Common Stock of Spiros Development Corporation II, Inc.
                            and One Warrant to Purchase
       One-Fourth of One Share of Common Stock of Dura Pharmaceuticals, Inc.





     1.   The initial public offering price per U.S. Unit, determined as
provided in Section 2, shall be $16.00.

     2.   The purchase price per U.S. Unit to be paid by the U.S. Underwriters
shall be $14.88, being an amount equal to the initial public offering price set
forth above less $1.12  per U.S. Unit.

     3.   The exercise price of the Warrants shall be $54.84 per share of  Dura
Common Stock.


                                      Sch B - 1
<PAGE>

                                      SCHEDULE C


                                    James C. Blair

                                     Julia Brown

                                  Herbert J. Conrad

                                 Joseph C. Cook, Jr.

                                   Chester Damecki

                                    Cam L. Garner

                                    David F. Hale

                                     Malcolm Hill

                                  David S. Kabakoff

                                   Robert W. Keith

                                     Erle T. Mast

                                   James W. Newman

                                 Charles W. Prettyman

                                  Gordon V. Ramseier

                                  Robert K. Schultz

                                   Charles G. Smith

                                   Walter F. Spath

                                   David Sudolsky

                                     Clyde Witham

                                 Mitchell R. Woodbury


                                      Sch C - 1
<PAGE>

                                                                       EXHIBIT A

                 FORM OF OPINION OF COUNSEL FOR DURA, SDC II and SDC
                             TO BE DELIVERED PURSUANT TO
                                     SECTION 5(b)

     [For purposes of this opinion, to be delivered at the Closing Time, the
     term "Subsidiaries" includes SDC.]

     (i)       Each of Dura and SDC II has been duly incorporated and is validly
existing as a corporation in good standing under the laws of the State of
Delaware.

     (ii)      Each of Dura and SDC II has full corporate power and authority to
own or lease its properties and conduct its business as described in the
Registration Statement and Prospectuses and, to enter into and perform its
obligations under the U.S. Purchase Agreement and the International Purchase
Agreement.

     (iii)     Each of Dura and SDC II is duly qualified as a foreign
corporation to transact business and is in good standing in each jurisdiction in
which such qualification is required, whether by reason of the ownership or
leasing of property or the conduct of business, except where the failure so to
qualify or to be in good standing would not result in a Dura Material Adverse
Effect or a SDC II Material Adverse Effect, as the case may be (which opinion as
to Dura may be given by the General Counsel of Dura).

     (iv)      The authorized capital stock of Dura conforms as to legal matters
in all material respects to the description thereof contained in the
Registration Statement and Prospectuses.  The authorized and outstanding shares
of capital stock of Dura are as set forth under the caption "Capitalization" and
have been duly and validly authorized and issued, are fully paid and
non-assessable, and are not subject to any preemptive rights (the opinion called
for by the last sentence of this paragraph (iv) may be given by the General
Counsel of Dura).

     (v)       The authorized, capital stock of SDC II conforms as to legal
matters in all material respects to the descriptions thereof contained in the
Registration Statement and Prospectuses under the caption "Spiros Corp. II
Capital Stock".

     (vi)      The outstanding shares of Special Common Stock of SDC II are as
set forth under the caption "Capitalization" have been duly and validly
authorized and issued, are, to our knowledge, fully paid and nonassessable, and
are not subject to any preemptive rights.

     (vii)     The Warrant Agreement has been duly authorized, executed and
delivered by Dura and constitutes a legal, valid and binding obligation of Dura,
enforceable against Dura in accordance to its terms.


                                         A-1
<PAGE>

     (viii)    The issuance of the Warrants has been duly authorized by Dura
and, when duly executed, issued and delivered by Dura and countersigned by the
Warrant Agent and when payment of the purchase price for the Units has been
made, the Warrants will constitute valid and binding obligations of Dura
entitled to the benefits of the Warrant Agreement.  The Warrants are not subject
to the preemptive rights of any stockholder of Dura.  The Warrants conform as to
legal matters in all material respects to the description thereof contained in
the Registration Statement and the Prospectuses under the caption "Description
of the Warrants."

     (ix)      The shares of Dura Common Stock issuable upon exercise of the
Warrants have been duly and validly reserved for the issuance and, when and if
issued upon such exercise and upon payment of the exercise price, in accordance
with the terms of the Warrant Agreement, will be duly and validly authorized and
issued, will be fully paid and nonassessable, and will not be subject to any
preemptive or similar rights of any stockholder of Dura.

     (x)       The issuance of the SDC II Common Stock has been duly authorized
and, when issued and paid for as part of the Units as contemplated by the U.S.
Purchase Agreement and the International Purchase Agreement, will be validly
issued, fully paid and non-assessable.  Such SDC II Common Stock is not subject
to the preemptive or similar rights of any stockholder of SDC II.

     (xi)      To our knowledge, the Subsidiaries, are Dura's sole subsidiaries.
Each Subsidiary has been duly incorporated and is validly existing as a
corporation in good standing under the laws of the jurisdiction of its
incorporation, has corporate power and authority to own or  lease its properties
and to conduct its business as described in the Registration Statement and
Prospectuses and is duly qualified as a foreign corporation to transact business
and is in good standing in each jurisdiction in which such qualification is
required, whether by reason of the ownership or leasing of property or the
conduct of business, except where the failure so to qualify or to be in good
standing would not result in a Dura Material Adverse Effect; all of the issued
and outstanding capital stock of each Subsidiary and SDC has been duly and
validly authorized and issued, are fully paid and non-assessable and, to the
best of our knowledge and information is owned by Dura free and clear of any
security interest, mortgage, pledge, lien, encumbrance, claim or equity; and
none of the outstanding shares of capital stock of any Subsidiary was issued in
violation of the preemptive rights of any securityholder of such Subsidiary (the
opinion called for by the last sentence of this paragraph (xi) may be given by
the General Counsel of Dura).

     (xii)     Each of the U.S. Purchase Agreement and the International
Purchase Agreement has been duly authorized, executed and delivered by Dura and
SDC II.

     (xiii)    The Registration Statement, including any Rule 462(b)
Registration Statement, has become effective under the Act. Any required filing
of the Prospectuses pursuant to Rule 424(b) has been made in the manner and
within the time period required by Rule 424(b). To our knowledge, no stop order
proceedings suspending the effectiveness of the Registration Statement


                                         A-2
<PAGE>

or any Rule 462(b) Registration Statement have been instituted or threatened or
are pending under the Act.

     (xiv)     All descriptions in the Prospectuses of agreements and other
instruments to which Dura, SDC II or the Subsidiaries are a party are accurate
in all material respects.  We know of no agreements required to be filed or
described in the Prospectuses or the Registration Statements which are not so
filed or described.  To our knowledge, no breach or default exists under any
agreement or instrument to which Dura, SDC II or any Subsidiary is a party and
which is filed as an Exhibit to the Registration Statement or incorporated by
reference therein (the opinion called for by the last two sentences of this
paragraph (xiv) may be given by the General Counsel of Dura and SDC II).

     (xv)      The form of certificate used to evidence the Units complies in
all material respects with all applicable statutory requirements, and the
requirements of the Nasdaq National Market.

     (xvi)     To our knowledge, there is no legal or governmental proceeding
pending or threatened to which Dura, any Subsidiary or SDC II is a party or to
which any of the properties of Dura, any Subsidiary or SDC II is subject that is
required to be described in the Registration Statement or the Prospectuses and
is not so described, or of any statute or regulation, contract or other document
that is required to be described in the Registration Statement or the
Prospectuses or to be filed as an exhibit to the Registration Statement that is
not described or filed as required.

     (xvii)    The statements in the Registration Statement under Item 14, to
the extent that such statements constitute matters of law, summaries of
documents contained therein or summaries of legal matters have been prepared by
or reviewed by us and are correct in all material respects.

     (xviii)   The September 30, 1997 offer and sale of 1,000 shares of SDC II
Common Stock with an aggregate value of $1,000 by SDC II to Dura was exempt from
the registration requirements of Section 5 of the 1933 Act by virtue of Section
4(2) and/or Regulation D promulgated thereunder.

     (xix)     None of Dura, any Subsidiary or SDC II is in violation of its
charter or by-laws and no default by Dura or any subsidiary exists in the due
performance or observance of any material obligation, agreement, covenant or
condition contained in any contract, indenture, mortgage, loan agreement, note,
lease or other agreement or instrument that is described or referred to in the
Registration Statement or the Prospectuses or filed or incorporated by reference
as an exhibit to the Registration Statement (which opinion as to Dura may be
given by the General Counsel of Dura).

     (xx)      No filing with, or authorization, approval, consent, license,
order, registration, qualification or decree of, any court or governmental
authority or agency, domestic or foreign,


                                         A-3
<PAGE>


(other than under the Act and the 1933 Act Regulations, which have been
obtained, or as may be required under the securities or blue sky laws of the
various states or any foreign jurisdiction , as to which no opinion is requested
or given) is necessary or required in connection with the due authorization,
execution and delivery of the Purchase Agreements or the offering, issuance,
sale or delivery of the Units, the SDC II Common Stock, the Warrants, or the
Dura Common Stock issuable upon exercise of the Warrants.

     (xxi)     The execution, delivery by Dura of, and the performance by Dura
of its obligations under the U.S. Purchase Agreement or the International
Purchase Agreement and the Warrant Agreement and the issuance and sale of the
Units contemplated thereby will not contravene any provision of applicable law
or the certificate of incorporation or bylaws of Dura or any Subsidiaries, or,
to our knowledge, any judgment, order or decree of any governmental body, agency
or court having jurisdiction over Dura or any of its property or any
Subsidiaries or any of their property, or, to our knowledge, constitute a breach
or default or a Dura Repayment Event (as defined in section 1(a)(xi) of the U.S.
Purchase Agreement) under any agreement or other instrument binding upon Dura or
any of the Subsidiaries, to which Dura or any of the Subsidiaries is a party and
filed as an exhibit to the Registration Statement or an Incorporated Document.

     (xxii)    The execution, delivery by SDC II of, and the performance by SDC
II of its obligations under the U.S. Purchase Agreement and the International
Purchase Agreement and the issuance and sale of the Units contemplated thereby
will not contravene any provision of applicable law or the certificate of
incorporation or bylaws of SDC II, or, to our knowledge,  any judgment, order or
decree of any governmental body, agency or court having jurisdiction over SDC II
or any of its property, or, to our knowledge, constitute a breach or default or
a SDC II Repayment Event (as defined in section 1(a)(xii) of the U.S. Purchase
Agreement) under any agreement or other instrument binding upon SDC II, to which
SDC II is a party and filed as an exhibit to the Registration Statement or an
Incorporated Document.

     (xxiii)   Each of the Major Agreements has been duly authorized, executed
and delivered by Dura, SDC, DDSI and SDC II as applicable.

     (xxiv)    No holders of securities of Dura have rights against Dura which
have not been waived to the registration of shares of Dura Common Stock or other
securities, because of the filing of the Registration Statement by Dura or the
offering contemplated thereby (which opinion may be given by the General Counsel
of Dura).

     (xxv)     The Units have been duly authorized for quotation on the Nasdaq
National Market, upon notice of official issuance.

     (xxvi)    The statements in the Registration Statement and Prospectuses
under the caption "United States Federal Income Tax Consequences" and "United
States Taxation of Non-U.S. Persons" to the extent they constitute matters of
law or legal conclusions with respect thereto, have been prepared or reviewed by
us and are correct in all material respects.


                                         A-4
<PAGE>

     (xxvii)   Neither Dura nor SDC II is an "investment company" or an entity
"controlled" by an "investment company", as such terms are defined in the 1940
Act.

          In addition to the foregoing, (i) we believe that each of the
Incorporated Documents (except for financial statements and schedules and other
financial data included therein or omitted therefrom, as to which no opinion is
requested or given), when they became effective or were filed with the
Commission, as the case may be, complied as to form when filed with the
Commission in all material respects with the requirements of the Act and the
1934 Act, as applicable, and the rules and regulations of the Commission
thereunder; (ii) we believe that the Registration Statement, the Prospectuses
and each amendment or supplement to the Registration Statement and Prospectuses
(except for financial statements and schedules and other financial data included
or incorporated by reference therein or omitted therefrom, as to which no
opinion is requested or given), as of their respective effective or issue dates,
complied as to form in all material respects with the requirements of the Act
and the applicable rules and regulations of the Commission thereunder; (iii) we
confirm that nothing has come to our attention that has caused us to conclude
that (except for financial statements and schedules and other financial data
included or incorporated by reference therein or omitted therefrom, as to which
we need make no statement) the Registration Statement or any amendment thereto,
including the Rule 430A Information and Rule 434 Information (if applicable), at
the time such Registration Statement or any such 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,
in the lights of the circumstances under which they were made, not misleading or
that (except for financial statements and schedules and other financial data
included or incorporated by reference therein or omitted therefrom, as to which
we need make no statement) the Prospectuses, on the date hereof, include an
untrue statement of a material fact or omits to state a material fact necessary
in order to make the statements therein, in light of the circumstances under
which they were made not misleading.

          In rendering such opinion, such counsel may rely (A) upon the opinions
of Lyon & Lyon and Kleinfeld, Kaplan & Becker and Mitchell R. Woodbury, Esq.
(which opinion may rely, to the extent appropriate, on the opinions of Conyers
Dill & Pearman, Bermuda counsel for Dura (Bermuda) Trading Company Ltd., and
Chancery Chambers, Barbados counsel for Dura (Barbados) Holding Company Ltd. and
Dura (Barbados) Ltd.) with respect to the matters opined upon by each, and (B),
as to matters of fact (but not as to legal conclusions), to the extent they deem
proper, on certificates of responsible officers of Dura or SDC II and public
officials. Such opinion shall be subject to standard limitations, exclusions,
qualifications and assumptions.   Such opinion shall not state that it is to be
governed or qualified by, or that it is otherwise subject to, any treatise,
written policy or other document relating to legal opinions, including, without
limitation, the Legal Opinion Accord of the ABA Section of Business Law (1991).


                                         A-5
<PAGE>


                                                                       EXHIBIT B


                                      EXHIBIT B


                          FORM OF OPINION OF PATENT COUNSEL
                FOR DURA AND SDC II DELIVERED PURSUANT TO SECTION 5(C)


          (i)  Dura owns U.S. patents and U.S. Foreign patent applications which
     are directed to Spiros and to certain uses of the Spiros product necessary
     to protect the business of Dura and Spiros Corp. II as described in the
     Prospectuses.  With regard to the business presently and as proposed to be
     conducted by Dura and Spiros Corp. II relating to the Spiros product as
     described in the Registration Statement and the Prospectuses, and, except
     as described therein, we have not received any notice of infringement of or
     conflict with, and does not otherwise know of any basis for notice of any
     such infringement of or conflict with, asserted rights of others with
     respect to any patents, trademarks, service marks, trade names, copyrights,
     technology or know-how relating to the Spiros product.

          (ii) To the extent that the statements relating to the Spiros product
     contained in the Registration Statement and Prospectuses under the
     subheadings "Risk Factors--Business Risks Related to Spiros Corp. II and
     Dura--Uncertainty Regarding Patents and Proprietary Technology;
     Unpredictability of Patent Protection - Spiros Corp. II," "Risk Factors -
     Business Risks Related to Spiros Corp. II and Dura -- Uncertainty Regarding
     Patents and Proprietary Technology; Unpredicability of Patent Protection -
     Dura," and the first paragraph of "Business of Spiros Corp. II -- Patents"
     refer to opinions of counsel or matters of law, patents or patent
     applications or purport to summarize the status of litigation or the
     provisions of statutes, regulations, contracts, agreements or other
     documents, such statements (A) have been prepared or reviewed by us and
     accurately reflect the status of any such patent applications, litigation,
     the provisions purported to be summarized and any of our opinions and (B)
     do not contain any untrue statements of a material fact or omit to state
     any material fact required to be stated therein or necessary to make the
     statements therein not misleading.


                                         B-1
<PAGE>

                                                                       EXHIBIT C


                        FORM OF OPINION OF REGULATORY COUNSEL
                                 FOR DURA AND SDC II
                              TO BE DELIVERED PURSUANT
                                   TO SECTION 5(d)


          (i)   The descriptions in the Registration Statement of the statutes,
     regulations and legal or governmental proceedings or procedures relating to
     the FDA and the approval process relating to the products of Dura and SDC
     II are accurate in all material respects and are a fair summary of those
     statutes, regulations, proceedings or procedures.

          (ii)  Nothing has come to our attention that leads us to believe that
     the descriptions of federal laws, regulations or rules relating to the
     manufacture or sale of Dura's products and the approval process relating
     thereto contained in the Registration Statement and the Prospectuses,
     including, without limitation, the portions of the Registration Statement
     and Prospectuses entitled "Risk Factors - Business Risks Related to Spiros
     Corp, II and Dura - Government Regulation;  No Assurance of FDA Approval,"
     and "Business of Dura - Government Regulation," 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 statement therein not misleading.

          (iii) We have no reason to believe that Dura's current business is not
     being conducted in material compliance with currently applicable
     requirements under the Federal Food, Drug and Cosmetic Act or that the FDA
     is currently considering taking action that would result in withdrawal from
     marketing of any of Dura's currently marketed products.


                                         C-1
<PAGE>

                                                                       EXHIBIT D

                                        October     , 1997

MERRILL LYNCH & CO.
Merrill Lynch, Pierce, Fenner & Smith
Incorporated
DONALDSON, LUFKIN & JENRETTE SECURITIES CORPORATION
     as Representatives of the several
     Underwriters to be named in the
     within mentioned Purchase Agreement
c/o Merrill Lynch & Co.
Merrill Lynch, Pierce, Fenner & Smith
          Incorporated
North Tower
World Financial Center
New York, New York  10281-1209


     Re:  Proposed Public Offering by Dura Pharmaceuticals, Inc. and Spiros
          Development Corporation II

Ladies and Gentlemen:

     The undersigned, a stockholder and/or officer and/or director of Dura
Pharmaceuticals, Inc. ("Dura") understands that Merrill Lynch & Co. ("Merrill
Lynch") and Donaldson, Lufkin & Jenrette ("DLJ") propose to enter into a
Purchase Agreement (the "Purchase Agreement") with Dura and Spiros Development
Corporation II ("SDC II") that will provide for the public offering of units
comprised of the common stock of SDC II and warrants to purchase Dura's common
stock (the "Securities").  In recognition of the benefit that such an offering
will confer upon the undersigned as a stockholder and/or officer and/or director
of Dura, and for other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the undersigned agrees with each
underwriter to be named in the Purchase Agreement that, during a period of
ninety (90) days from the date of the Purchase Agreement, the undersigned will
not, without the prior written consent of Merrill Lynch, directly or indirectly,
(i) sell, offer to sell, pledge, contract to sell, sell any option or contract
to purchase, purchase any option or contract to sell, grant any option, right or
warrant for the sale of, or otherwise dispose of or transfer any shares of
Dura's common stock (the "Dura Common Stock"), or any securities convertible
into or exchangeable or exercisable for Dura Common Stock, whether now owned or
hereafter acquired by the undersigned, or with respect to which the undersigned
has or hereafter acquires the power of disposition, or file, participate in, or
request the filing of any registration statement under the Securities Act of
1933, as amended, with respect to any of the foregoing or (ii) enter into any
swap or any other agreement or any transaction that transfers, in whole or in
part,


                                         D-1
<PAGE>

directly or indirectly, the economic consequence of ownership of Dura Common
Stock, whether any such swap or transaction is to be settled by delivery of Dura
Common Stock or other securities, in cash or otherwise.

                                   Very truly yours,



                                   Signature:
                                              ------------------------

                                   Print Name: 
                                               -----------------------


                                         D-2
<PAGE>

     If the foregoing is in accordance with your understanding of our agreement,
please sign and return to each of Dura and SDC II a counterpart hereof,
whereupon this instrument, along with all counterparts, will become a binding
agreement among the U.S. Underwriters, Dura and SDC II in accordance with its
terms.

                              Very truly yours,

                              DURA PHARMACEUTICALS, INC.


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

                              SPIROS DEVELOPMENT CORPORATION II, INC.


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


CONFIRMED AND ACCEPTED,
     as of the date first above written:


MERRILL LYNCH & CO.
MERRILL LYNCH, PIERCE, FENNER & SMITH
               INCORPORATED

DONALDSON, LUFKIN & JENRETTE SECURITIES CORPORATION

By:  MERRILL LYNCH, PIERCE, FENNER & SMITH
                INCORPORATED


By:  /s/ James J. Jackson, Vice President
     ------------------------------------
            Authorized Signatory


For themselves and as U.S. Representatives of the other U.S. Underwriters named
in Schedule A hereto.




<PAGE>

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




                       SPIROS DEVELOPMENT CORPORATION II, INC.
                               (a Delaware corporation)



                              DURA PHARMACEUTICALS, INC.
                               (a Delaware corporation)



                                   1,100,000 Units

                              Each Unit Consisting of
   One Share of Callable Common Stock of Spiros Development Corporation II, Inc.
                            and One Warrant to Purchase
       One-Fourth of One Share of Common Stock of Dura Pharmaceuticals, Inc.



                          INTERNATIONAL  PURCHASE AGREEMENT




Dated:  December 16, 1997


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

<PAGE>

                                  TABLE OF CONTENTS

SECTION 1.    Representations and Warranties . . . . . . . . . . . . . . . .   4
    (a)       Representations and Warranties by the Companies. . . . . . . .   4
         (i)       Compliance with Registration Requirements . . . . . . . .   5
         (ii)      Incorporated Documents. . . . . . . . . . . . . . . . . .   5
         (iii)     Independent Accountants . . . . . . . . . . . . . . . . .   6
         (iv)      Financial Statements. . . . . . . . . . . . . . . . . . .   6
         (v)       No Material Adverse Change in Business. . . . . . . . . .   7
         (vi)      Good Standing of the Companies. . . . . . . . . . . . . .   7
         (vii)     Good Standing of Subsidiaries . . . . . . . . . . . . . .   8
         (viii)    Capitalization. . . . . . . . . . . . . . . . . . . . . .   8
         (ix)      Authorization of Agreements . . . . . . . . . . . . . . .   9
         (x)       Authorization and Description of Units. . . . . . . . . .  10
         (xi)      Registration or Similar Rights Waived . . . . . . . . . .  11
         (xii)     Absence of Defaults and Conflicts . . . . . . . . . . . .  11
         (xiii)    Compliance with Laws. . . . . . . . . . . . . . . . . . .  12
         (xiv)     Absence of Labor Dispute. . . . . . . . . . . . . . . . .  12
         (xv)      Absence of Proceedings. . . . . . . . . . . . . . . . . .  12
         (xvi)     Accuracy of Exhibits. . . . . . . . . . . . . . . . . . .  13
         (xvii)    Possession of Intellectual Property . . . . . . . . . . .  13
         (xviii)   Absence of Further Requirements . . . . . . . . . . . . .  14
         (xix)     Possession of Licenses and Permits. . . . . . . . . . . .  14
         (xx)      Title to Property . . . . . . . . . . . . . . . . . . . .  14
         (xxi)     Compliance with Cuba Act. . . . . . . . . . . . . . . . .  15
         (xxii)    Investment Company Act. . . . . . . . . . . . . . . . . .  15
         (xxiii)   Environmental Laws. . . . . . . . . . . . . . . . . . . .  15
         (xxiv)    Taxes . . . . . . . . . . . . . . . . . . . . . . . . . .  15
         (xxv)     Insurance . . . . . . . . . . . . . . . . . . . . . . . .  16
         (xxvi)    Accounting Controls . . . . . . . . . . . . . . . . . . .  16
         (xxvii)   Lock-up Agreements. . . . . . . . . . . . . . . . . . . .  16
         (xxviii)  Affiliate Transactions. . . . . . . . . . . . . . . . . .  16
         (xxix)    Distribution of Prospectuses. . . . . . . . . . . . . . .  16
    (b)       Officer's Certificates . . . . . . . . . . . . . . . . . . . .  17
SECTION 2.    Sale and Delivery to Managers; Closing . . . . . . . . . . . .  17
    (a)       Initial International Units. . . . . . . . . . . . . . . . . .  17
    (b)       International Option Units . . . . . . . . . . . . . . . . . .  17
    (c)       Payment. . . . . . . . . . . . . . . . . . . . . . . . . . . .  17
    (d)       Denominations; Registration. . . . . . . . . . . . . . . . . .  18
SECTION 3.    Covenants of the Companies . . . . . . . . . . . . . . . . . .  18
    (a)       Compliance with Securities Regulations and Commission
              Requests . . . . . . . . . . . . . . . . . . . . . . . . . . .  18
    (b)       Filing of Amendments . . . . . . . . . . . . . . . . . . . . .  19


                                        i
<PAGE>

    (c)       Delivery of Registration Statement . . . . . . . . . . . . . .  19
    (d)       Delivery of Prospectuses . . . . . . . . . . . . . . . . . . .  19
    (e)       Continued Compliance with Securities Laws. . . . . . . . . . .  20
    (f)       Rule 158 . . . . . . . . . . . . . . . . . . . . . . . . . . .  20
    (g)       Use of Proceeds. . . . . . . . . . . . . . . . . . . . . . . .  20
    (h)       Listing. . . . . . . . . . . . . . . . . . . . . . . . . . . .  20
    (i)       Restriction on Sale of Dura Common Stock . . . . . . . . . . .  20
    (j)       Reporting Requirements . . . . . . . . . . . . . . . . . . . .  21
SECTION 4.    Payment of Expenses. . . . . . . . . . . . . . . . . . . . . .  21
    (a)       Expenses . . . . . . . . . . . . . . . . . . . . . . . . . . .  21
    (b)       Termination of Agreement . . . . . . . . . . . . . . . . . . .  21
SECTION 5.    Conditions of Managers' Obligations. . . . . . . . . . . . . .  22
    (a)       Effectiveness of Registration Statement. . . . . . . . . . . .  22
    (b)       Opinion of Counsel for the Companies . . . . . . . . . . . . .  22
    (c)       Opinion of Patent Counsel for the Companies. . . . . . . . . .  22
    (d)       Opinion of Regulatory Counsel for the Companies. . . . . . . .  22
    (e)       Opinion of Counsel for the Managers. . . . . . . . . . . . . .  22
    (f)       Officers' Certificate. . . . . . . . . . . . . . . . . . . . .  23
    (g)       Accountants' Comfort Letter. . . . . . . . . . . . . . . . . .  23
    (h)       Bring-down Comfort Letter. . . . . . . . . . . . . . . . . . .  23
    (i)       Approval of Listing. . . . . . . . . . . . . . . . . . . . . .  23
    (j)       No Objection . . . . . . . . . . . . . . . . . . . . . . . . .  23
    (k)       Lock-up Agreements . . . . . . . . . . . . . . . . . . . . . .  24
    (l)       Purchase of Initial U.S. Units . . . . . . . . . . . . . . . .  24
    (m)       Conditions to Purchase of International Option Units . . . . .  24
         (i)       Officers' Certificate . . . . . . . . . . . . . . . . . .  24
         (ii)      Opinions of Counsel for the Companies . . . . . . . . . .  24
         (iii)     Opinion of Counsel for the Managers . . . . . . . . . . .  24
         (iv)      Bring-down Comfort Letter . . . . . . . . . . . . . . . .  24
    (n)       Additional Documents . . . . . . . . . . . . . . . . . . . . .  24
    (o)       Termination of Agreement . . . . . . . . . . . . . . . . . . .  25
SECTION 6.    Indemnification. . . . . . . . . . . . . . . . . . . . . . . .  25
    (a)       Indemnification of Managers. . . . . . . . . . . . . . . . . .  25
    (b)       Indemnification of the Companies and Directors and Officers. .  26
    (c)       Actions against Parties; Notification. . . . . . . . . . . . .  26
    (d)       Settlement without Consent if Failure to Reimburse . . . . . .  27
SECTION 7.    Contribution . . . . . . . . . . . . . . . . . . . . . . . . .  27
SECTION 8.    Representations, Warranties and Agreements to Survive
              Delivery . . . . . . . . . . . . . . . . . . . . . . . . . . .  28
SECTION 9.    Termination of Agreement . . . . . . . . . . . . . . . . . . .  29
    (a)       Termination; General . . . . . . . . . . . . . . . . . . . . .  29
    (b)       Liabilities. . . . . . . . . . . . . . . . . . . . . . . . . .  29
SECTION 10.   Default by One or More of the Managers . . . . . . . . . . . .  29


                                       ii
<PAGE>

SECTION 11.   Default by the Companies . . . . . . . . . . . . . . . . . . .  30
SECTION 12.   Notices. . . . . . . . . . . . . . . . . . . . . . . . . . . .  30
SECTION 13.   Parties. . . . . . . . . . . . . . . . . . . . . . . . . . . .  30
SECTION 14.   Governing Law and Time . . . . . . . . . . . . . . . . . . . .  31
SECTION 15.   Effect of Headings . . . . . . . . . . . . . . . . . . . . . .  31

SCHEDULES
    Schedule A -   List of Managers. . . . . . . . . . . . . . . . . . . Sch A-1
    Schedule B -   Pricing Information . . . . . . . . . . . . . . . . . Sch B-1
    Schedule C -   List of Persons and Entities Subject to Lock-up . . . Sch C-1

EXHIBITS
    Exhibit A -    Form of Opinion of Counsel for Dura . . . . . . . . . . . A-1
    Exhibit B -    Form of Opinion of Intellectual Property
                   Counsel for Dura. . . . . . . . . . . . . . . . . . . . . B-1
    Exhibit C -    Form of Opinion of U.S. Regulatory Counsel
                   for the Companies . . . . . . . . . . . . . . . . . . . . C-1
    Exhibit D -    Form of Lock-up Letter. . . . . . . . . . . . . . . . . . D-1


                                       iii
<PAGE>

                       SPIROS DEVELOPMENT CORPORATION II, INC.
                               (a Delaware corporation)



                              DURA PHARMACEUTICALS, INC.
                               (a Delaware corporation)



                                   1,100,000 Units

                              Each Unit Consisting of
   One Share of Callable Common Stock of Spiros Development Corporation II, Inc.
                            and One Warrant to Purchase
       One-Fourth of One Share of Common Stock of Dura Pharmaceuticals, Inc.


                          INTERNATIONAL PURCHASE AGREEMENT

                                                              December 16, 1997

MERRILL LYNCH INTERNATIONAL
    (as "Lead Manager")
DONALDSON, LUFKIN & JENRETTE SECURITIES CORPORATION
    (together, the "Managers")
c/o Merrill Lynch International
Ropemaker Place
25 Ropemaker Street
London EC2Y 9LY
England

Ladies and Gentlemen:

    Spiros Development Corporation II, Inc., a Delaware corporation ("SDC II"),
and Dura Pharmaceuticals, Inc., a Delaware corporation ("Dura" and, together
with SDC II, the "Companies"), confirm their respective agreements with Merrill
Lynch International ("Merrill Lynch") and Donaldson, Lufkin & Jenrette
Securities Corporation  (together, the "Managers," which term shall also include
any underwriter substituted as hereinafter provided in Section 10

<PAGE>

hereof), for whom Merrill Lynch is acting as representative (in such capacity,
the "Lead Manager"), with respect to the issue and sale by the Companies, and
the purchase by the Managers, acting severally and not jointly, of the
respective number of units set forth in said Schedule A, each unit composed of
one share of callable common stock, par value $.001 per share, of SDC II
("SDC II Common Stock") and one warrant (each a "Warrant") that will entitle the
registered owner thereof to purchase one-fourth of one share of common stock,
par value $.001 per share, of Dura ("Dura Common Stock") at a per share exercise
price as set forth in Schedule A hereto, pursuant to and subject to certain
adjustments as set forth in the Warrant certificate to be issued as part of the
Unit Certificate (as hereinafter defined), and with respect to the grant by SDC
II and Dura to the Managers, acting severally and not jointly, of the option
described in Section 2(b) hereof to purchase all or any part of 165,000
additional units to cover over-allotments, if any.  The SDC II Common Stock and
the Warrants will be paired for sale as units by SDC II and Dura and then sold
to the Managers.  The aforesaid 1,100,000 units (the "Initial International
Units") to be purchased by the Managers and all or any part of the 165,000 units
subject to the option described in Section 2(b) (the "International Option
Units") are hereinafter called, collectively, the "International Units."

    It is understood that the Companies concurrently are entering into an
agreement dated the date hereof (the "U.S. Purchase Agreement") providing for
the offering by the Companies of an aggregate of 4,400,000 units composed of one
share of SDC II Common Stock and one Warrant (the "Initial U.S. Units") through
arrangements with certain underwriters in the United States and Canada (the
"U.S. Underwriters") for whom Merrill Lynch, Pierce, Fenner & Smith Incorporated
and Donaldson, Lufkin & Jenrette Securities Corporation are acting as
representatives (the "U.S. Representatives") and the grant by the Companies to
the U.S. Underwriters, acting severally and not jointly, of an option to
purchase all or any part of the U.S. Underwriters' pro rata portion of up to
660,000 additional units composed of one share of SDC II Common Stock and one
Warrant solely to cover over-allotments, if any (the "U.S. Option Units" and,
together with the International Option Units, the "Option Units").  The Initial
U.S. Units and the U.S. Option Units are hereinafter called the "U.S. Units."
It is understood that the Companies are not obligated to sell and the Managers
are not obligated to purchase, any Initial International Units unless all of the
Initial U.S. Units are contemporaneously purchased by the U.S. Underwriters.

    The Managers and the U.S. Underwriters are hereinafter collectively called
the "Underwriters", the Initial U.S. Units and the Initial International Units
are hereinafter collectively called the "Initial Units", and the U.S. Units and
the International Units are hereinafter collectively called the "Units."

    The Underwriters concurrently will enter into an Intersyndicate Agreement
of even date herewith (the "Intersyndicate Agreement") providing for the
coordination of certain transactions among the Underwriters under the direction
of Merrill Lynch & Co., Merrill Lynch, Pierce, Fenner & Smith Incorporated (in
such capacity, the "Global Coordinator").


                                          2
<PAGE>

    The Companies understand that the Managers propose to make a public
offering of the International Units as soon as the Lead Manager deems advisable
after this Agreement has been executed and delivered.

    Each Unit initially will be represented by a certificate representing one
or more Warrants and one or more shares of SDC II Common Stock (a "Unit
Certificate").  Each Unit will be transferable only as a whole and as described
in the Prospectuses (as hereinafter defined) through December 31, 1999 or such
earlier date on which the Purchase Option (as defined in the Prospectuses) is
exercised or expires unexercised, after which date the Warrants and the SDC II
Common Stock will trade separately; PROVIDED, HOWEVER, that such separation date
will be accelerated upon the occurrence of an Acceleration Event (as defined in
the Prospectuses) with respect to Dura.  The SDC II Common Stock, the Warrants
and the U.S. Units are more fully described in the Registration Statement (as
hereinafter defined) and the Prospectuses.

    The Companies have filed with the Securities and Exchange Commission (the
"Commission") a combined registration statement (Nos. 333-37673 and
333-37673-01) covering the registration of the U.S. Units under the Securities
Act of 1933, as amended (the "1933 Act"), including the related preliminary
prospectus or prospectuses, (a) with respect to SDC II, on Form S-1, relating to
the SDC II Common Stock comprising a portion of the U.S. Units, and (b) with
respect to Dura, on Form S-3, relating to the Warrants comprising a portion of
the U.S. Units, the Dura Common Stock underlying the Warrants and the Dura
Common Stock issuable upon exercise of the Purchase Option.  Promptly after
execution and delivery of this Agreement, the Companies will either (i) prepare
and file a prospectus in accordance with the provisions of Rule 430A ("Rule
430A") of the rules and regulations of the Commission under the 1933 Act (the
"1933 Act Regulations") and paragraph (b) of Rule 424 ("Rule 424(b)") of the
1933 Act Regulations or (ii) if the Companies have elected to rely upon Rule 434
("Rule 434") of the 1933 Act Regulations, prepare and file a term sheet (a "Term
Sheet") in accordance with the provisions of Rule 434 and Rule 424(b).  Two
forms of prospectus are to be used in connection with the offering and sale of
the Units:  one relating to the International Units (the "Form of International
Prospectus") and one relating to the U.S. Units (the "Form of U.S. Prospectus").
The Form of International Prospectus is identical to the Form of U.S.
Prospectus, except for the front cover and back cover pages, the information
under the caption "Underwriting", the inclusion in the "Prospectus Summary"
section of the Form of International Prospectus of a paragraph under the caption
"United States Taxation of Non-U.S. Persons" and the exclusion in the Form of
International Prospectus of a section under the caption "United States Federal
Income Tax Consequences."  The information included in any such prospectus or in
any such Term Sheet, as the case may be, that was omitted from such registration
statement at the time it became effective but that is deemed to be part of such
registration statement at the time it became effective (A) pursuant to paragraph
(b) of Rule 430A is referred to as "Rule 430A Information" or (B) pursuant to
paragraph (d) of Rule 434 is referred to as "Rule 434 Information."  Each Form
of International Prospectus and Form of U.S. Prospectus used before such
registration statement became effective, and any prospectus that omitted, as
applicable, the Rule 430A Information or the Rule 434 Information, that was used
after such effectiveness and


                                          3
<PAGE>

prior to the execution and delivery of this Agreement, is herein called a
"preliminary prospectus."  Such registration statement, including the exhibits
thereto, schedules thereto, if any, and the documents incorporated by reference
therein pursuant to Item 12 of Form S-3 under the 1933 Act, at the time it
became effective and including the Rule 430A Information and the Rule 434
Information, as applicable, is herein called the "Registration Statement."  Any
registration statement filed pursuant to Rule 462(b) of the 1933 Act Regulations
is herein referred to as the "Rule 462(b) Registration Statement," and after
such filing the term "Registration Statement" shall include the Rule 462(b)
Registration Statement.  The final Form of International Prospectus and the
final Form of U.S. Prospectus, including the documents incorporated by reference
therein pursuant to Item 12 of Form S-3 under the 1933 Act, in the forms first
furnished to the Underwriters for use in connection with the offering of the
Units (the "Unit Offering") are herein called the "International Prospectus" and
the "U.S. Prospectus," respectively, and, collectively, the "Prospectuses."  If
Rule 434 is relied on, the term "International Prospectus" and "U.S. Prospectus"
shall refer to the preliminary International Prospectus dated December 1, 1997
and the preliminary U.S. Prospectus dated December 1, 1997, respectively, each
together with the applicable Term Sheet and all references in this Agreement to
the date of such Prospectuses shall mean the date of the applicable Term Sheet.
For purposes of this Agreement, all references to the Registration Statement,
any preliminary prospectus, the International Prospectus, the U.S. Prospectus or
any Term Sheet or any amendment or supplement to any of the foregoing shall be
deemed to include the copy filed with the Commission pursuant to its Electronic
Data Gathering, Analysis and Retrieval system ("EDGAR").

    Prior to the Closing Time (as defined), Dura intends to acquire all of the
outstanding capital stock of Spiros Development Corporation ("SDC") for an
aggregate purchase price of approximately $45.7 million, payable in cash, shares
of Dura Common Stock, or any combination thereof (the "SDC Purchase").

    All references in this Agreement to financial statements and schedules and
other information which is "contained", "included" or "stated" in the
Registration Statement, any preliminary prospectus (including the Form of U.S.
Prospectus and the Form of International Prospectus) or the Prospectuses (or
other references of like import) shall be deemed to mean and include all such
financial statements and schedules and other information which is incorporated
by reference in the Registration Statement, any preliminary prospectus
(including the Form of U.S. Prospectus and the Form of International Prospectus)
or the Prospectuses, as the case may be; and all references in this Agreement to
amendments or supplements to the Registration Statement, any preliminary
prospectus or the Prospectuses shall be deemed to mean and include the filing of
any document under the Securities Exchange Act of 1934 (the "1934 Act") which is
incorporated by reference in the Registration Statement, such preliminary
prospectus or the Prospectuses, as the case may be.


                                          4
<PAGE>

    SECTION 1.  REPRESENTATIONS AND WARRANTIES.

    (a)  REPRESENTATIONS AND WARRANTIES BY THE COMPANIES.  The Companies
jointly and severally represent and warrant to each Manager as of the date
hereof, as of the Closing Time referred to in Section 2(c) hereof, and as of
each Date of Delivery (if any) referred to in Section 2(b) hereof, and agree
with each Manager, as follows:

         (i)       COMPLIANCE WITH REGISTRATION REQUIREMENTS.  Dura meets the
    requirements for use of Form S-3 under the 1933 Act.  Each of the
    Registration Statement and any Rule 462(b) Registration Statement has
    become effective under the 1933 Act and no stop order suspending the
    effectiveness of the Registration Statement or any Rule 462(b) Registration
    Statement has been issued under the 1933 Act and no proceedings for that
    purpose have been instituted or are pending or, to the knowledge of the
    Companies, are contemplated by the Commission, and any request on the part
    of the Commission for additional information has been complied with.

         At the respective times the Registration Statement, any Rule 462(b)
    Registration Statement and any post-effective amendments thereto become
    effective and at the Closing Time (and, if any International Option Units
    are purchased, at the Date of Delivery), the Registration Statement, the
    Rule 462(b) Registration Statement and any amendments and supplements
    thereto complied and will comply in all material respects with the
    requirements of the 1933 Act and the 1933 Act Regulations and did not and
    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.  Neither of the Prospectuses nor any
    amendments or supplements thereto, at the time the Prospectuses or any
    amendments or supplements were issued and at the Closing Time (and, if any
    International Option Units are purchased, at the Date of Delivery),
    included or will include an untrue statement of a material fact or omitted
    or will omit to state a material fact necessary in order to make the
    statements therein, in the light of the circumstances under which they were
    made, not misleading.  If Rule 434 is used, the Companies will comply with
    the requirements of Rule 434.  The representations and warranties in this
    subsection shall not apply to statements in or omissions from the
    Registration Statement or the International Prospectus made in reliance
    upon and in conformity with information furnished to the Companies in
    writing by any Manager through Merrill Lynch expressly for use in the
    Registration Statement or the International Prospectus.

         Each preliminary prospectus and the prospectuses filed as part of the
    Registration Statement as originally filed or as part of any amendment
    thereto, or filed pursuant to Rule 424 under the 1933 Act, complied when so
    filed in all material respects with the 1933 Act Regulations and each
    preliminary prospectus and the Prospectuses delivered to the Underwriters
    for use in connection with this offering was identical to the


                                          5
<PAGE>

    electronically transmitted copies thereof filed with the Commission
    pursuant to EDGAR, except to the extent permitted by Regulation S-T.

         (ii)      INCORPORATED DOCUMENTS.  The documents incorporated or
    deemed to be incorporated by reference in the Registration Statement and
    the Prospectuses, when they became effective or at the time they were or
    hereafter are filed with the Commission, complied and will comply in all
    material respects with the requirements of the 1933 Act and the 1933 Act
    Regulations or the Securities Exchange Act of 1934 (the "1934 Act") and the
    rules and regulations of the Commission thereunder (the "1934 Act
    Regulations"), as applicable, and, when read together with the other
    information in the Prospectuses, at the time the Registration Statement
    became effective, at the time the Prospectuses were issued and at the
    Closing Time (and, if any U.S. Option Units are purchased, at the Date of
    Delivery), did not and 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.

         (iii)     INDEPENDENT ACCOUNTANTS.  Deloitte & Touche LLP, which are
    reporting upon the audited financial statements and supporting schedules
    with respect to Dura, Spiros Development Corporation ("SDC") and SDC II
    incorporated by reference or included in the Registration Statement, are
    independent accountants as required by the 1933 Act and the 1933 Act
    Regulations.

         (iv)      FINANCIAL STATEMENTS.  (A)  The financial statements of Dura
    incorporated by reference or included in the Registration Statement and the
    Prospectuses, together with the related schedules and notes, present fairly
    the financial position of Dura (and, for relevant periods consistent with
    the Commission's rules and regulations, Dura's Subsidiaries (as defined in
    clause (vii) below)) at the dates indicated and the statements of
    operations, shareholders' equity and cash flows of Dura (and, for relevant
    periods consistent with the Commission's rules and regulations, each of the
    Subsidiaries) for the periods specified; except as otherwise stated in the
    Registration Statement, said financial statements have been prepared in
    conformity with generally accepted accounting principles ("GAAP") applied
    on a consistent basis throughout the periods involved.  The supporting
    schedules, if any, included in the Registration Statement present fairly in
    accordance with GAAP the information required to be stated therein.  The
    selected financial data and summary financial information for Dura and the
    Subsidiaries included in the Prospectuses present fairly in accordance with
    GAAP the information shown therein and have been compiled on a basis
    consistent with that of the audited financial statements of Dura and the
    Subsidiaries included in the Registration Statement.  Other than the
    financial statements and schedules referred to in this paragraph (iv), no
    other financial statements or schedules are required to be included in the
    Registration Statement or incorporated therein by reference.


                                          6
<PAGE>

         (B)  The financial statements of SDC included in the Registration
    Statement and the Prospectuses, together with the related schedules and
    notes, present fairly the financial position of SDC at the dates indicated
    and the statements of operations, shareholders' equity and cash flows of
    SDC for the periods specified; EXCEPT AS OTHERWISE STATED IN THE
    REGISTRATION STATEMENT, said financial statements have been prepared in
    conformity with GAAP applied on a consistent basis throughout the periods
    involved.

         (C)  The financial statements of SDC II included in the Registration
    Statement and the Prospectuses, together with the related schedules and
    notes, present fairly the financial position of SDC II at the date
    indicated; except as otherwise stated in the Registration Statement, said
    financial statements have been prepared in conformity with GAAP.

         (D)  The pro forma financial statements and the related notes thereto
    included in the Registration Statement and the Prospectuses or incorporated
    therein by reference present fairly in accordance with GAAP the information
    shown therein, have been prepared in accordance with the Commission's rules
    and guidelines with respect to pro forma financial statements and have been
    properly compiled on the bases described therein, and the assumptions used
    in the preparation thereof are reasonable and the adjustments used therein
    are appropriate to give effect to the transactions and circumstances
    referred to therein.

         (v)       NO MATERIAL ADVERSE CHANGE IN BUSINESS.  Since the
    respective dates as of which information is given in the Registration
    Statement and the Prospectuses, except as otherwise stated therein, (A)
    there has been no material adverse change in the condition, financial or
    otherwise, or in the earnings, business affairs or business prospects of
    Dura and the Subsidiaries (as defined below), considered as one enterprise,
    whether or not arising in the ordinary course of business (a "Dura Material
    Adverse Effect"), (B) there has been no material adverse change in the
    condition, financial or otherwise, or in the earnings, business affairs or
    business prospects of SDC, whether or not arising in the ordinary course of
    business (an "SDC Material Adverse Effect"), (C) there has been no material
    adverse change in the condition, financial or otherwise, or in the
    earnings, business affairs or business prospects of SDC II, whether or not
    arising in the ordinary course of business (an "SDC II Material Adverse
    Effect"), (D) there have been no transactions entered into by Dura or any
    Subsidiary, SDC or SDC II, other than in the ordinary course of business,
    which are material with respect to Dura and the Subsidiaries, considered as
    one enterprise, SDC or SDC II, respectively, and (D) there has been no
    dividend or distribution of any kind declared, paid or made by each of SDC,
    SDC II or Dura, on any class of its respective capital stock.  As used in
    this Agreement on the date hereof, a "Material Adverse Effect" shall mean
    both a Dura Material Adverse Effect and an SDC Material Adverse Effect.


                                          7
<PAGE>

         (vi)      GOOD STANDING OF THE COMPANIES.  (A)  Dura has been duly
    organized and is validly existing as a corporation in good standing under
    the laws of the State of Delaware and has corporate power and authority to
    own, lease and operate its properties and to conduct its business as
    described in the Prospectuses and to enter into and perform its obligations
    under this Agreement; and Dura is duly qualified as a foreign corporation
    to transact business and is in good standing in each other jurisdiction in
    which such qualification is required, whether by reason of the ownership or
    leasing of property or the conduct of business, except where the failure to
    so qualify or to be in good standing would not result in a Dura Material
    Adverse Effect.

         (B)  SDC II has been duly organized and is validly existing as a
    corporation in good standing under the laws of the State of Delaware and
    has corporate power and authority to own, lease and operate its properties
    and to conduct its business as described in the Prospectuses and to enter
    into and perform its obligations under this Agreement; and SDC II is duly
    qualified as a foreign corporation to transact business and is in good
    standing in each jurisdiction in which such qualification is required,
    whether by reason of the ownership or leasing of property or the conduct of
    business, except where the failure to so qualify or to be in good standing
    would not result in an SDC II Material Adverse Effect.

         (vii)     GOOD STANDING OF SUBSIDIARIES.   Dura Delivery Systems,
    Inc., a Delaware corporation ("DDSI"), Health Script Pharmacy Services,
    Inc., a Colorado corporation ("Health Script"), Healthco Solutions, Inc., a
    Colorado corporation ("Healthco"), HS Wholesaler, Inc., a Colorado
    corporation ("HS Wholesaler"), Scandi Acquisition Corp., a Delaware
    corporation ("Scandi"), DCI, Ltd., a corporation organized under the laws
    of the Cayman Islands ("DCI"), Dura (Bermuda) Trading Company Ltd., a
    corporation organized under the laws of Bermuda ("Dura (Bermuda)"), Dura
    (Barbados) Ltd., a corporation organized under the laws of Barbados ("Dura
    (Barbados)"), Dura (Barbados) Holding Company Ltd., a corporation organized
    under the laws of Barbados ("Dura (Barbados) Holding"), Dura USA Holdings,
    Inc., a Delaware corporation ("Dura USA") and SDC Acquisition Corp., a
    Delaware corporation ("SDC Acquisition") are the only subsidiaries of Dura
    (DDSI, Health Script, Healthco, HS Wholesaler, Scandi, DCI, Dura (Bermuda),
    Dura (Barbados), Dura (Barbados) Holding, Dura USA, SDC Acquisition and,
    unless otherwise indicated, SDC, are hereinafter referred to as the
    "Subsidiaries").  Except for the Subsidiaries, neither Dura nor any
    Subsidiary owns any shares of stock or any other equity securities of any
    corporation or has any equity interests in any firm, partnership,
    association or other entity other than 775,193 shares of Common Stock of
    Trega Biosciences, Inc. and 754,799 shares of Common Stock of Cosmederm
    Technologies, Inc., each held by Dura.  Each Subsidiary has been duly
    organized and is validly existing as a corporation in good standing under
    the laws of the jurisdiction of its incorporation, has corporate power and
    authority to own, lease and operate its properties and conduct its business
    as described in the Prospectuses and is duly qualified as a foreign
    corporation to transact business and is in good standing in each
    jurisdiction


                                          8
<PAGE>

    in which such qualification is required, whether by reason of the ownership
    or leasing of property or the conduct of business, except where the failure
    so to qualify or to be in good standing would not result in a Material
    Adverse Effect; all of the issued and outstanding capital stock of each
    Subsidiary has been duly authorized and validly issued, is fully paid and
    non-assessable and (other than with respect to SDC) is owned solely by Dura
    or another Subsidiary free and clear of any security interest, mortgage,
    pledge, lien, encumbrance, claim or equity; none of the outstanding shares
    of capital stock of any Subsidiary was issued in violation of the
    preemptive or similar rights of any securityholder of such Subsidiary
    arising by operation of law, under the charter or by-laws of such
    Subsidiary or under any agreement to which Dura or such Subsidiary is a
    party.

         (B)  Upon the consummation of the SDC Purchase, all of the outstanding
    shares of capital stock of SDC will be owned by Dura free and clear of any
    security interest, mortgage, pledge, lien, encumbrance, claim or equity.

         (viii)    CAPITALIZATION.  The authorized, issued and outstanding
    capital stock of each of Dura and SDC II is as set forth in the
    Prospectuses under the column "Actual" under the captions "Dura
    Capitalization" and "Spiros Corp. II Capitalization", respectively (except,
    in the case of Dura, for subsequent issuances, if any, pursuant to
    reservations, agreements or employee benefit plans referred to in the
    Prospectuses or incorporated by reference therein or pursuant to the
    exercise of convertible securities, warrants or options referred to in the
    Prospectuses or incorporated by reference therein).  The shares of issued
    and outstanding capital stock of each of Dura and SDC II have been duly
    authorized and validly issued and are fully paid and non-assessable; none
    of the outstanding shares of capital stock of Dura or SDC II was issued in
    violation of the preemptive or other similar rights of any securityholder
    of Dura or SDC II, respectively, arising by operation of law, under the
    charter or by-laws of Dura or SDC II, as the case may be, or under any
    agreement to which Dura or SDC II is a party.  Except as disclosed in the
    Prospectuses or incorporated by reference therein, there are no outstanding
    options, warrants or other rights calling for the issuance of, and no
    commitments, plans or arrangements to issue, any shares of capital stock of
    Dura, SDC II or any Subsidiary or any security convertible into or
    exchangeable for capital stock of Dura, SDC II or any Subsidiary.

         (ix)      AUTHORIZATION OF AGREEMENTS.  (A)  This Agreement and the
    U.S. Purchase Agreement have been duly authorized, executed and delivered
    by each of Dura and SDC II.

         (B)  The Warrant Agreement (as hereinafter defined) has been duly
    authorized by Dura, and when executed and delivered by Dura and the Warrant
    Agent thereunder, will constitute a valid and binding agreement of Dura,
    enforceable against Dura in accordance with its terms, except as
    enforcement thereof may be limited by bankruptcy,


                                          9
<PAGE>

    insolvency (including, without limitation, all laws relating to fraudulent
    transfers), reorganization, moratorium or similar laws affecting
    enforcement of creditors' rights generally and except as enforcement
    thereof is subject to general principles of equity (regardless of whether
    enforcement is considered in a proceeding in equity or at law).

         (C)  Each of the Development Agreement, the Technology Agreement, the
    Albuterol and Product Option Agreement, the Manufacturing and Marketing
    Agreement and the Services Agreement (each as defined in the Prospectuses,
    and collectively referred to herein as the "Transaction Agreements") has
    been duly authorized by Dura and SDC II and, in the case of the Technology
    Agreement, Dura, SDC II, SDC and DDSI, and when executed and delivered by
    Dura and SDC II, and, in the case of the Technology Agreement, Dura, SDC
    II, SDC and DDSI, will constitute valid and binding agreements of each of
    Dura, SDC II, SDC and DDSI, as the case may be, enforceable against Dura,
    SDC II, SDC and DDSI in accordance with their terms, except as the
    enforcement thereof may be limited by bankruptcy, insolvency (including,
    without limitation, all laws relating to fraudulent transfers),
    reorganization, moratorium or similar laws affecting  enforcement of
    creditors' rights generally and except as enforcement thereof is subject to
    general principles of equity (regardless of whether enforcement is
    considered in a proceeding in equity or at law).

         (x)       AUTHORIZATION AND DESCRIPTION OF UNITS.  (A)  The SDC II
    Common Stock to be issued by SDC II as a component of the Units has been
    duly authorized for issuance and sale to the Managers pursuant to this
    Agreement and to the U.S. Underwriters pursuant to the U.S. Purchase
    Agreement, respectively, and, when issued and delivered by SDC II against
    payment of the purchase price therefor as provided in this Agreement and
    the U.S. Purchase Agreement, respectively, will be validly issued, fully
    paid and non-assessable; the SDC II Common Stock conforms in all material
    respects to the statements relating thereto contained in the Prospectuses
    and such description conforms to the rights set forth in the instruments
    defining the same; no holder of SDC II Common Stock will be subject to
    personal liability by reason of being such a holder; and the issuance of
    the SDC II Common Stock is not subject to the preemptive or other similar
    rights of any securityholder of SDC II.

         (B)  The Warrants to be issued as a component of the Units have been
    duly authorized by Dura for issuance and sale to the Managers pursuant to
    this Agreement and to the U.S. Underwriters pursuant to the U.S. Purchase
    Agreement, respectively, and, when duly executed, issued and delivered by
    Dura and duly countersigned by the Warrant Agent (as hereinafter defined)
    in the manner provided for in the Warrant Agreement (the "Warrant
    Agreement") to be entered into between Dura and ChaseMellon Shareholder
    Services, as warrant agent (the "Warrant Agent"), and, when issued and
    delivered by Dura against payment of the purchase price therefor  as
    provided in this Agreement and the U.S. Purchase Agreement, respectively,
    will constitute valid and binding obligations of Dura, entitled to the
    benefits of the Warrant Agreement, and will


                                          10
<PAGE>

    be enforceable in accordance with its terms, except as the enforcement
    thereof may be limited by bankruptcy, insolvency (including, without
    limitation, all laws relating to fraudulent transfers), reorganization,
    moratorium or similar laws affecting enforcement of creditors' rights
    generally and except as enforcement thereof is subject to general
    principles of equity (regardless of whether enforcement is considered in a
    proceeding in equity or at law); such Warrants are not subject to the
    preemptive rights of any stockholder of Dura.

         (C)  Dura shall have available such number of shares of Dura Common
    Stock deliverable upon exercise of the Warrants as is sufficient to permit
    the exercise in full of the Warrants.  All shares of Dura Common Stock
    issued upon exercise of the Warrants, when issued and paid for in
    accordance with the terms of the Warrant Agreement, will be duly
    authorized, validly issued, fully paid and nonassessable; shares of Dura
    Common Stock are not subject to the preemptive rights of any stockholder of
    Dura; and all corporate action required to be taken for such authorization,
    issue and sale of the Dura Common Stock will have been validly and
    sufficiently taken upon the issuance of the Warrants; such shares of Dura
    Common Stock conform in all material respects to the descriptions thereof
    contained or incorporated by reference in the Prospectuses and all
    corporate action required to be taken for the authorization, issue and sale
    of such shares of Dura Common Stock has been validly and sufficiently
    taken.

         (xi)      REGISTRATION OR SIMILAR RIGHTS WAIVED.  Except as set forth
    in the Prospectuses, there are no persons with registration or other
    similar rights to have any securities registered pursuant to the
    Registration Statement or otherwise registered by the Companies under the
    1933 Act who have not waived such rights.

         (xii)     ABSENCE OF DEFAULTS AND CONFLICTS.  (A)  Neither Dura nor
    any Subsidiary is in violation of its charter or by-laws or in default in
    the performance or observance of any obligation, agreement, covenant or
    condition contained in any contract, indenture, mortgage, deed of trust,
    loan or credit agreement, note, lease or other agreement or instrument to
    which Dura or any Subsidiary is a party or by which it or any of them may
    be bound, or to which any of the property or assets of Dura or any
    Subsidiary is subject (collectively, "Agreements and Instruments") except
    for such defaults that would not result in a Material Adverse Effect; and
    the execution, delivery and performance of each of this Agreement, the U.S.
    Purchase Agreement, the Warrant Agreement and the Transaction Agreements by
    Dura, SDC and DDSI, as the case may by, the issuance and delivery of the
    Warrants and the issuance of shares of Dura Common Stock upon the exercise
    of the Warrants and the consummation by Dura, SDC and DDSI, as the case may
    be, of the transactions contemplated in this Agreement, the U.S. Purchase
    Agreement, the Warrant Agreement and the Transaction Agreements and in the
    Registration Statement (including the issuance and sale of the Warrants as
    part of the Units) and compliance by Dura, SDC and DDSI, as the case may
    be, with their respective obligations under this Agreement, the U.S.
    Purchase Agreement, the Warrant


                                          11
<PAGE>

    Agreement and each of the Transaction Agreements to which they are a party
    have been duly authorized by all necessary corporate action and do not and
    will not, whether with or without the giving of notice or passage of time
    or both, conflict with or constitute a breach of, or default or Repayment
    Event (as defined below) under, or result in the creation or imposition of
    any lien, charge or encumbrance upon any property or assets of Dura or any
    Subsidiary pursuant to, the Agreements and Instruments (except for such
    conflicts, breaches or defaults or liens, charges or encumbrances that
    would not result in a Material Adverse Effect), nor will such action result
    in any violation of the provisions of the charter or by-laws of Dura or any
    Subsidiary or any applicable material law, statute, rule, regulation,
    judgment, order, writ or decree of any government, government
    instrumentality or court, domestic or foreign, having jurisdiction over
    Dura or any Subsidiary or any of their assets, properties or operations.
    As used herein, a "Repayment Event" means any event or condition which
    gives the holder of any note, debenture or other evidence of indebtedness
    (or any person acting on such holder's behalf) the right to require the
    repurchase, redemption or repayment of all or a portion of such
    indebtedness by Dura or any Subsidiary.

         (B)  SDC II is not in violation of its charter or by-laws or in
    default in the performance or observance of any obligation, agreement,
    covenant or condition contained in any contract, indenture, mortgage, deed
    of trust, loan or credit agreement, note, lease or other agreement or
    instrument to which SDC II is a party or by which it may be bound, or to
    which any of the property or assets of SDC II is subject (collectively,
    "SDC II Agreements and Instruments") except for such defaults that would
    not result in an SDC II Material Adverse Effect; and the execution,
    delivery and performance of each of this Agreement, the U.S. Purchase
    Agreement and the Transaction Agreements by SDC II and the consummation by
    SDC II of the transactions contemplated herein, therein and in the
    Registration Statement (including the issuance and sale of the SDC II
    Common Stock as part of the Units and the use of the proceeds from the sale
    of the Units as described in the Prospectuses under the caption "Use of
    Proceeds") and compliance by SDC II with its obligations under this
    Agreement, the U.S. Purchase Agreement and each of the Transaction
    Agreements have been duly authorized by all necessary corporate action and
    do not and will not, whether with or without the giving of notice or
    passage of time or both, conflict with or constitute a breach of, or
    default or SDC II Repayment Event (as defined below) under, or result in
    the creation or imposition of any lien, charge or encumbrance upon any
    property or assets of SDC II pursuant to, the SDC II Agreements and
    Instruments (except for such conflicts, breaches or defaults or liens,
    charges or encumbrances that would not result in an SDC II Material Adverse
    Effect), nor will such action result in any violation of the provisions of
    the charter or by-laws of SDC II or any applicable material law, statute,
    rule, regulation, judgment, order, writ or decree of any government,
    government instrumentality or court, domestic or foreign, having
    jurisdiction over SDC II or any of its assets, properties or operations.
    As used herein, an "SDC II Repayment Event" means any event or condition
    which gives the holder of any note, debenture or other evidence of
    indebtedness (or any person acting on


                                          12
<PAGE>

    such holder's behalf) the right to require the repurchase, redemption or
    repayment of all or a portion of such indebtedness by SDC II.

         (xiii)    COMPLIANCE WITH LAWS.  Except as set forth in the
    Prospectuses, Dura and the Subsidiaries and SDC II are in compliance in all
    material respects with all applicable laws, statutes, ordinances, rules or
    regulations, the enforcement of which, individually or in the aggregate,
    would be reasonably expected to have a Material Adverse Effect or an SDC II
    Material Adverse Effect, as the case may be.

         (xiv)     ABSENCE OF LABOR DISPUTE.  No labor dispute with the
    employees of Dura or any Subsidiary exists or, to the knowledge of Dura, is
    imminent, and Dura is not aware of any existing or imminent labor
    disturbance by the employees of any of its or any Subsidiary's principal
    suppliers, manufacturers, customers or contractors, which, in either case,
    may reasonably be expected to result in a Dura Material Adverse Effect or
    an SDC II Material Adverse Effect.

         (xv)      ABSENCE OF PROCEEDINGS.  There is no action, suit,
    proceeding, inquiry or investigation (except applications for regulatory
    approval for marketing of pharmaceutical products) before or brought by any
    court or governmental agency or body, domestic or foreign, now pending or,
    to the knowledge of either Dura or SDC II, threatened against or affecting
    Dura or any Subsidiary or SDC II that is required to be disclosed in the
    Registration Statement or that might reasonably be expected to have a
    Material Adverse Effect, or an SDC II Material Adverse Effect, or which
    might reasonably be expected to materially and adversely affect the
    properties or assets of either Dura and the Subsidiaries (other than SDC),
    considered as one enterprise, or SDC II or SDC, as the case may be, or the
    consummation of the transactions contemplated in this Agreement, the U.S.
    Purchase Agreement, the Warrant Agreement and the Transaction Agreements or
    the performance by Dura or SDC II of its obligations hereunder or
    thereunder; the aggregate of all pending legal or governmental proceedings
    to which Dura or any Subsidiary or SDC II, as the case may be, is a party
    or which affect any of their respective property or assets is subject which
    are not described in the Registration Statement, including ordinary routine
    litigation incidental to its business, could not reasonably be expected to
    result in a Material Adverse Effect or an SDC II Material Adverse Effect,
    as the case may be.

         (xvi)     ACCURACY OF EXHIBITS.  There are no contracts or documents
    which are required to be described in the Registration Statement, the
    Prospectuses or the documents incorporated by reference therein or to be
    filed as exhibits thereto which have not been described and filed as
    required.

         (xvii)    POSSESSION OF INTELLECTUAL PROPERTY.  (A)  Except as set
    forth in the Prospectuses, each of Dura and the Subsidiaries owns or
    possesses adequate licenses or other rights to use the patents, patent
    rights, licenses, inventions, copyrights, know how


                                          13
<PAGE>

    (including trade secrets and other unpatented and/or unpatentable
    proprietary or confidential information, systems or procedures), which are
    necessary for the operation of their businesses as presently conducted
    except where the failure to so own or have the right to use would not have
    a Material Adverse Effect.  Except as disclosed in the Prospectuses,
    nothing has come to the attention of Dura or the Subsidiaries to the effect
    that (1) any product, process, method, substance, part or other material
    presently contemplated to be sold by or employed by Dura or any of the
    Subsidiaries in connection with Dura's or such Subsidiary's business may
    infringe any patent, trademark, service mark, trade name, copyright,
    license or other right owned by others, (2) there is pending or threatened
    any claim or litigation against or affecting Dura and the Subsidiaries
    contesting their right to sell or use any such product, process, method,
    substance, part or other material or (3) there is, or there is pending, any
    patent, invention, device, application or any applicable statute, law,
    rule, regulation, standard or code, in the case of each of clause (1), (2)
    or (3) above, which could have Material Adverse Effect.

         (B)  SDC II will, to the extent provided for in the Technology
    Agreement, have the right to use all patents, patent rights, licenses,
    inventions, copyrights, know how (including trade secrets and other
    unpatented and/or unpatentable proprietary or confidential information,
    systems or procedures) owned or controlled by Dura or the Subsidiaries,
    which are necessary for the operation of its business as described in the
    Prospectuses.  SDC II has not received any notice of proceedings relating
    to revocation or modification of any such licenses, permits, certificates,
    consents, orders, approvals or authorizations which singularly or in the
    aggregate, if the subject of an unfavorable ruling or finding, could have a
    SDC II Material Adverse Effect.

         (xviii)   ABSENCE OF FURTHER REQUIREMENTS.  (A)  No filing with, or
    authorization, approval, consent, license, order, registration,
    qualification or decree of, any court or governmental authority or agency
    is necessary or required for the performance by the Companies of their
    obligations under this Agreement, the U.S. Purchase Agreement, the Warrant
    Agreement and the Transaction Agreements, in connection with the offering,
    issuance, sale and delivery of the shares of SDC II Common Stock, the
    Warrants or the shares of Dura Common Stock deliverable upon exercise of
    the Warrants or the consummation of the transactions contemplated by this
    Agreement, the U.S. Purchase Agreement, the Warrant Agreement and the
    Transaction Agreements, except such as have been already obtained or as may
    be required under the 1933 Act or the 1933 Act Regulations and foreign or
    state securities or blue sky laws.

         (B)  No filing with, or authorization, approval, consent, license,
    order, registration, qualification or decree of, any court or governmental
    authority or agency is necessary or required for the consummation by SDC
    and DDSI of the transactions contemplated by this Agreement, except such as
    have already been obtained.


                                          14
<PAGE>

         (xix)     POSSESSION OF LICENSES AND PERMITS.  Dura and the
    Subsidiaries and SDC II possess such permits, licenses, approvals, consents
    and other authorizations (collectively, "Governmental Licenses") issued by
    the appropriate federal, state, local or foreign regulatory agencies or
    bodies material to the conduct of the business now operated by Dura, the
    Subsidiaries and SDC II, respectively; Dura and the Subsidiaries and SDC II
    are in compliance with the terms and conditions of all such Governmental
    Licenses, except where the failure so to comply would not, singly or in the
    aggregate, have a Material Adverse Effect or a SDC II Material Adverse
    Effect, as the case may be; all of the Governmental Licenses are valid and
    in full force and effect, except when the invalidity of such Governmental
    Licenses or the failure of such Governmental Licenses to be in full force
    and effect would not have a Material Adverse Effect or a SDC II Material
    Adverse Effect, as the case may be; and neither Dura nor any Subsidiary nor
    SDC II has received any notice of proceedings relating to the revocation or
    modification of any such Governmental Licenses which, singly or in the
    aggregate, if the subject of an unfavorable decision, ruling or finding,
    would result in a Material Adverse Effect or an SDC II Material Adverse
    Effect; provided, however, that no FDA approval has been received with
    respect to products that Dura, the Subsidiaries or SDC II currently are not
    permitted to market.

         (xx)      TITLE TO PROPERTY.  Dura and the Subsidiaries have good and
    marketable title to all material properties and assets owned by Dura and
    the Subsidiaries, in each case, free and clear of all mortgages, pledges,
    liens, security interests, claims, restrictions or encumbrances of any kind
    except such as (a) are described or incorporated by reference in the
    Prospectuses or (b) do not, singly or in the aggregate, materially affect
    the value of such property and do not interfere with the use made and
    proposed to be made of such property by Dura or the affected Subsidiaries,
    as the case may be; and all properties held under lease by Dura or any
    Subsidiary are held under valid, subsisting and enforceable leases.

         (B)  SDC II has good and marketable title to all material properties
    and assets described in the Prospectuses as owned by it, free and clear of
    all mortgages, pledges, liens, security interests, claims, restrictions or
    encumbrances of any kind except such as (a) are described in the
    Prospectuses or (b) do not, singly or in the aggregate, materially affect
    the value of such property and do not interfere with the use made and
    proposed to be made of such property by SDC II.

         (xxi)     COMPLIANCE WITH CUBA ACT.  Dura has complied with, and is
    and will be in compliance with, the provisions of that certain Florida act
    relating to disclosure of doing business with Cuba, codified as Section
    517.075 of the Florida statutes, and the rules and regulations thereunder
    (collectively, the "Cuba Act") or is exempt therefrom.

         (xxii)    INVESTMENT COMPANY ACT.  Neither of the Companies is and,
    upon the issuance and sale of the Units as herein contemplated and the
    application of the net


                                          15
<PAGE>

    proceeds therefrom as described in the Prospectuses, will not be an
    "investment company" or an entity "controlled" by an "investment company"
    as such terms are defined in the Investment Company Act of 1940, as amended
    (the "1940 Act").

         (xxiii)   ENVIRONMENTAL LAWS.  Except as described in the Registration
    Statement and except as would not, singly or in the aggregate, result in a
    Dura Material Adverse Effect, (A) neither Dura nor any Subsidiary is in
    material violation of any federal, state, local or foreign law, rule,
    regulation, ordinance or any judicial or administrative interpretation
    thereof, including any judicial or administrative order, consent, decree or
    judgment, relating to pollution or protection of human health, the
    environment (including, without limitation, ambient air, surface water,
    groundwater, land surface or subsurface strata) or wildlife, including,
    without limitation, laws and regulations relating to the release or
    threatened release of chemicals, pollutants, contaminants, wastes, toxic
    substances, hazardous substances, petroleum or petroleum products
    (collectively, "Hazardous Materials") or to the manufacture, processing,
    distribution, use, treatment, storage, disposal, transport or handling of
    Hazardous Materials (collectively, "Environmental Laws"), (B) Dura and the
    Subsidiaries have all permits, authorizations and approvals required under
    any applicable Environmental Laws and are each in compliance with their
    requirements, (C) there are no pending or, to the best knowledge of Dura,
    threatened administrative, regulatory or judicial actions, suits, demands,
    demand letters, claims, liens, notices of noncompliance or violation,
    investigation or proceedings relating to any Environmental Law against Dura
    or any of the Subsidiaries and (iv) to the best knowledge of Dura, there
    are no events or circumstances that could form the basis of an order for
    clean-up or remediation, or an action, suit or proceeding by any private
    party or governmental body or agency, against or affecting Dura or any
    Subsidiary relating to Hazardous Materials or any Environmental Laws.

         (xxiv)    TAXES.  Dura and the Subsidiaries have filed all federal,
    state, local and foreign tax returns that are required to be filed or have
    duly requested extensions thereof and have paid all taxes required to be
    paid by any of them and any related assessments, fines or penalties, except
    for any such tax, assessment, fine or penalty that is being contested in
    good faith and by appropriate proceedings; and adequate charges, accruals
    and reserves have been provided for in the financial statements referred to
    in Section 1(a)(iv)(A) above in respect of all federal, state, local and
    foreign taxes for all periods as to which the tax liability of Dura or any
    Subsidiary has not been finally determined or remains open to examination
    by applicable taxing authorities.

         (xxv)     INSURANCE.  Dura and the Subsidiaries carry or are entitled
    to the benefits of insurance in such amounts and covering such risks as is
    generally maintained by companies of established repute engaged in the same
    or similar business and all such insurance is in full force and effect.


                                          16
<PAGE>

         (xxvi)    ACCOUNTING CONTROLS.  Dura and the Subsidiaries maintain a
    system of internal accounting controls sufficient to provide reasonable
    assurance that (A) transactions are executed in accordance with
    management's general and specific authorizations; (B) transactions are
    recorded as necessary to permit preparations of financial statements in
    conformity with GAAP and to maintain accountability for assets; (C) access
    to assets is permitted only in accordance with management's general or
    specific authorizations; and (D) the recorded accountability for assets is
    compared with the existing assets at reasonable intervals and appropriate
    action is taken with respect to any differences.

         (xxvii)   LOCK-UP AGREEMENTS.  The Companies have obtained and
    delivered to the Managers the agreements, in the form of Exhibit D hereto,
    of the persons and entities named in Schedule C annexed hereto to the
    effect that each such person will not, for a period of 90 days from the
    date of this Agreement and except as otherwise provided in their respective
    agreement, without the prior written consent of Merrill Lynch, directly or
    indirectly, offer to sell, grant any option for the sale of, or otherwise
    dispose of any shares of Dura Common Stock or any securities convertible
    into or exercisable for shares of Dura Common Stock owned by such person or
    entity or with respect to which such person has the power of disposition.

         (xxviii)  AFFILIATE TRANSACTIONS.  No relationship, direct or
    indirect, exists between or among any of Dura or any affiliate of Dura, on
    the one hand, and any director, officer, shareholder, customer or supplier
    of any of them, on the other hand, which is required by the 1933 Act or by
    the 1933 Act Regulations to be described in the Registration Statement or
    the Prospectuses and which is not so described or is not described as
    required or is not incorporated by reference therein.

         (xxix)    DISTRIBUTION OF PROSPECTUSES.  The Companies have not
    distributed and, prior to the later to occur of (A) Closing Time and (B)
    completion of the distribution of the Units, will not distribute any
    prospectus (as such term is defined in the 1933 Act and the 1933 Act
    Regulations) in connection with the offering and sale of the Units other
    than the Registration Statement, any preliminary prospectus, the
    Prospectuses or other materials, if any, permitted by the 1933 Act or by
    the 1933 Act Regulations and approved by the Lead Manager.

    (b)  OFFICER'S CERTIFICATES.  Any certificate signed by any officer of Dura
or any  Subsidiary or SDC II, delivered to the Global Coordinator, the Lead
Manager or to counsel for the Managers shall be deemed a representation and
warranty by Dura or SDC II, as the case may be, to each Manager as to the
matters covered thereby.


                                          17
<PAGE>

    SECTION 2.  SALE AND DELIVERY TO MANAGERS; CLOSING.

    (a)  INITIAL INTERNATIONAL UNITS.  On the basis of the representations and
warranties herein contained and subject to the terms and conditions herein set
forth, the Companies, severally and not jointly, agree to sell to each Manager,
and each Manager, severally and not jointly, agrees to purchase from the
Companies, at the price per Unit set forth in Schedule B, the number of Initial
International Units set forth in Schedule A opposite the name of such Manager,
plus any additional number of Initial International Units that such Manager may
become obligated to purchase pursuant to the provisions of Section 10 hereof.

    (b)  INTERNATIONAL OPTION UNITS.  In addition, on the basis of the
representations and warranties herein contained and subject to the terms and
conditions herein set forth, the Companies, acting severally and not jointly,
hereby grant an option to the Managers, severally and not jointly, to purchase
up to an additional 165,000 Units at the same price per Unit set forth in
Schedule B for the Initial International Units.  The option hereby granted will
expire 30 days after the date hereof and may be exercised in whole or in part
from time to time only for the purpose of covering over-allotments which may be
made in connection with the offering and distribution of the Initial
International Units upon notice by the Global Coordinator to the Companies
setting forth the number of International Option Units as to which the several
Managers are then exercising the option and the time and date of payment and
delivery for such International Option Units.  Any such time and date of
delivery (a "Date of Delivery") shall be determined by the Global Coordinator,
but shall not be later than seven full business days after the exercise of said
option, nor in any event prior to the Closing Time, as hereinafter defined.  If
the option is exercised as to all or any portion of the International Option
Units, each of the Managers, acting severally and not jointly, will purchase
that proportion of the total number of International Option Units then being
purchased which the number of Initial International Units set forth in
Schedule A opposite the name of such Manager bears to the total number of
Initial International Units, subject in each case to such adjustments as the
Global Coordinator in its discretion shall make to eliminate any sales or
purchases of fractional Units.

    (c)  PAYMENT.  Payment of the purchase price for, and delivery of
certificates for, the Initial U.S. Units shall be made at the offices of
Brobeck, Phleger & Harrison LLP, 550 West C Street, Suite 1300, San Diego,
California 92101, or at such other place as shall be agreed upon by the Global
Coordinator and the Companies, at 7:00 A.M. (California time) on the third
(fourth, if the pricing occurs after 4:30 P.M. (Eastern time) on any given day)
business day after the date hereof (unless postponed in accordance with the
provisions of Section 10), or such other time not later than ten business days
after such date as shall be agreed upon by the Global Coordinator and the
Companies (such time and date of payment and delivery being herein called
"Closing Time").

    In addition, in the event that any or all of the International Option Units
are purchased by the Managers, payment of the purchase price for, and delivery
of certificates for, such International Option Units shall be made at the
above-mentioned offices, or at such other place


                                          18
<PAGE>

as shall be agreed upon by the Global Coordinator and the Companies, on each
Date of Delivery as specified in the notice from the Global Coordinator to the
Companies.

    Payment shall be made to the Companies by wire transfer of immediately
available funds to a bank account designated by the Companies, against delivery
to the Lead Manager of certificates for the respective accounts of the Managers
of certificates for the International Units to be purchased by them.  It is
understood that each Manager has authorized the Lead Manager, for its account,
to accept delivery of, receipt for, and make payment of the purchase price for,
the Initial International Units and the International Option Units, if any, that
it has agreed to purchase.  Merrill Lynch, individually and not as
representative of the Managers, may (but shall not be obligated to) make payment
of the purchase price for the Initial International Units or the International
Option Units, if any, to be purchased by any Manager whose funds have not been
received by the Closing Time or the relevant Date of Delivery, as the case may
be, but such payment shall not relieve such Manager from its obligations
hereunder.

    (d)  DENOMINATIONS; REGISTRATION.  Certificates for the Initial
International Units and the International Option Units, if any, shall be in such
denominations and registered in such names as the Lead Manager may request in
writing at least one full business day before the Closing Time or the relevant
Date of Delivery, as the case may be.  The certificates for the Initial
International Units and the International Option Units, if any, will be made
available for examination and packaging by the Managers in The City of New York
not later than 10:00 A.M. (Eastern time) on the business day prior to the
Closing Time or the relevant Date of Delivery, as the case may be.

    SECTION 3.  COVENANTS OF THE COMPANIES.  Each of the Companies covenants
with each Manager as follows:

         (a)  COMPLIANCE WITH SECURITIES REGULATIONS AND COMMISSION REQUESTS.
    The Companies, subject to Section 3(b), will comply with the requirements
    of Rule 430A or Rule 434, as applicable, and will notify the Global
    Coordinator immediately, and confirm the notice in writing, (i) when any
    post-effective amendment to the Registration Statement shall become
    effective, or any supplement to the Prospectuses or any amended
    Prospectuses shall have been filed, (ii) of the receipt of any comments
    from the Commission, (iii) of any request by the Commission for any
    amendment to the Registration Statement or any amendment or supplement to
    the Prospectuses or for additional information and (iv) of the issuance by
    the Commission of any stop order suspending the effectiveness of the
    Registration Statement or of any order preventing or suspending the use of
    any preliminary prospectus, or of the suspension of the qualification of
    the Units for offering or sale in any jurisdiction, or of the initiation or
    threatening of any proceedings for any of such purposes.  The Companies
    will promptly effect the filings necessary pursuant to Rule 424(b) and will
    take such steps as they deem necessary to ascertain promptly whether the
    form of prospectus transmitted for filing under Rule 424(b) was received
    for filing by the Commission and, in the event that it


                                          19
<PAGE>

    was not, will promptly file such prospectus.  The Companies will make every
    reasonable effort to prevent the issuance of any stop order and, if any
    stop order is issued, to obtain the lifting thereof at the earliest
    possible moment.

         (b)  FILING OF AMENDMENTS.  The Companies will give the Global
    Coordinator notice of their intention to file or prepare any amendment to
    the Registration Statement (including any filing under Rule 462(b)), any
    Term Sheet or any amendment, supplement or revision to either the
    prospectus included in the Registration Statement at the time it became
    effective or to the Prospectuses, whether pursuant to the 1933 Act, the
    1934 Act or otherwise, will furnish the Global Coordinator with copies of
    any such documents a reasonable amount of time prior to such proposed
    filing or use, as the case may be, and will not file or use any such
    document to which the Global Coordinator or counsel for the Managers shall
    object.

         (c)  DELIVERY OF REGISTRATION STATEMENT.  The Companies have furnished
    or will deliver to the Lead Manager and counsel for the Managers, without
    charge, signed copies of the Registration Statement as originally filed and
    of each amendment thereto (including exhibits filed therewith or
    incorporated by reference therein and documents incorporated or deemed to
    be incorporated by reference therein) and signed copies of all consents and
    certificates of experts, and will also deliver to the Lead Manager, without
    charge, a conformed copy of the Registration Statement as originally filed
    and of each amendment thereto (without exhibits) for each of the Managers.
    The copies of the Registration Statement and each amendment thereto
    furnished to the Managers will be identical to the electronically
    transmitted copies thereof filed with the Commission pursuant to EDGAR,
    except to the extent permitted by Regulation S-T.

         (d)  DELIVERY OF PROSPECTUSES.  The Companies have delivered to each
    Manager, without charge, as many copies of each preliminary prospectus as
    such Manager reasonably requested, and the Companies hereby consent to the
    use of such copies for purposes permitted by the 1933 Act.  The Companies
    will furnish to each Manager, without charge, during the period when the
    International Prospectus is required to be delivered under the 1933 Act or
    the 1934 Act, such number of copies of the International Prospectus (as
    amended or supplemented) as such Manager may reasonably request.  The
    International Prospectus and any amendments or supplements thereto
    furnished to the Managers will be identical to the electronically
    transmitted copies thereof filed with the Commission pursuant to EDGAR,
    except to the extent permitted by Regulation S-T.

         (e)  CONTINUED COMPLIANCE WITH SECURITIES LAWS.  The Companies will
    comply with the 1933 Act and the 1933 Act Regulations and the 1934 Act and
    the 1934 Act Regulations so as to permit the completion of the distribution
    of the Units as contemplated in this Agreement, the U.S. Purchase Agreement
    and in the Prospectuses.  If at any time when a prospectus is required by
    the 1933 Act to be delivered in


                                          20
<PAGE>

    connection with sales of the Units, any event shall occur or condition
    shall exist as a result of which it is necessary, in the opinion of counsel
    for the Managers or for the Companies, to amend the Registration Statement
    or amend or supplement any Prospectus in order that the Prospectuses will
    not include any untrue statements of a material fact or omit to state a
    material fact necessary in order to make the statements therein not
    misleading in the light of the circumstances existing at the time any such
    Prospectus is delivered to a purchaser, or if it shall be necessary, in the
    opinion of such counsel, at any such time to amend the Registration
    Statement or amend or supplement any Prospectus in order to comply with the
    requirements of the 1933 Act or the 1933 Act Regulations, the Companies
    will promptly prepare and file with the Commission, subject to Section
    3(b), such amendment or supplement as may be necessary to correct such
    statement or omission or to make the Registration Statement or the
    Prospectuses comply with such requirements, and the Companies will furnish
    to the Managers such number of copies of such amendment or supplement as
    the Managers may reasonably request.

         (f)  RULE 158.  The Companies will timely file such reports pursuant
    to the 1934 Act as are necessary in order to make generally available to
    their securityholders as soon as practicable an earnings statement for the
    purposes of, and to provide the benefits contemplated by, the last
    paragraph of Section 11(a) of the 1933 Act.

         (g)  USE OF PROCEEDS.  SDC II will use the net proceeds received by it
    from the sale of the Units in the manner specified in the Prospectuses
    under "Use of Proceeds."

         (h)  LISTING.  The Companies will use their best efforts to effect and
    maintain the quotation of the Units on the Nasdaq National Market and will
    file with the Nasdaq National Market all documents and notices required by
    the Nasdaq National Market of companies that have securities that are
    traded in the over-the-counter market and quotations for which are reported
    by the Nasdaq National Market.

         (i)  RESTRICTION ON SALE OF DURA COMMON STOCK.  During a period of 90
    days from the date of the Prospectuses, Dura will not, without the prior
    written consent of the Global Coordinator, (i) directly or indirectly,
    offer, pledge, sell, contract to sell, sell any option or contract to
    purchase, purchase any option or contract to sell, grant any option, right
    or warrant to purchase or otherwise transfer or dispose of any shares of
    Dura Common Stock or any securities convertible into or exercisable or
    exchangeable for shares of Dura Common Stock or file any registration
    statement under the 1933 Act with respect to any of the foregoing or
    (ii) enter into any swap or any other agreement or any transaction that
    transfers, in whole or in part, directly or indirectly, the economic
    consequence of ownership of Dura Common Stock whether any such swap or
    transaction described in clause (i) or (ii) above is to be settled by
    delivery of shares of Dura Common Stock or such other securities, in cash
    or otherwise.  The foregoing sentence shall not apply to (A) the Units to
    be sold hereunder or under the U.S. Purchase Agreement, (B) any shares of
    Dura Common Stock issued by Dura upon the exercise of


                                          21
<PAGE>

    an option or warrant or the conversion of a security outstanding on the
    date hereof and referred to in, or incorporated by reference into, the
    Prospectuses,  (C) any shares of Dura Common Stock issued or options to
    purchase Dura Common Stock granted pursuant to existing employee benefit
    plans of Dura referred to in, or incorporated by reference into, the
    Prospectuses or (D) any shares of Dura Common Stock issued to stockholders
    of SDC in connection with the acquisition of all of the outstanding stock
    of SDC pursuant to a registration statement on Form S-3 filed with the
    Commission on October 15, 1997, as amended (No. 333-37955).

         (j)  REPORTING REQUIREMENTS. The Companies, during the period when the
    Prospectuses are required to be delivered under the 1933 Act or the 1934
    Act, will file all documents required to be filed with the Commission
    pursuant to the 1934 Act within the time periods required by the 1934 Act
    and the 1934 Act Regulations.

         (k)  LOCK-UP AGREEMENTS.  SDC II will cause each person that becomes a
    director or officer within 90 days of the date hereof to deliver an
    agreement substantially in the form of Exhibit D hereto.

    SECTION 4.     PAYMENT OF EXPENSES.

    (a)  EXPENSES.  SDC II will pay or cause to be paid all expenses incident
to the performance of the Companies' obligations under this Agreement, including
(i) the preparation, printing and filing of the Registration Statement
(including financial statements and exhibits) as originally filed and of each
amendment thereto, (ii) the preparation, printing and delivery to the
Underwriters of this Agreement, any Agreement among Underwriters, the Warrant
Agreement and such other documents as may be required in connection with the
offering, purchase, sale, issuance or delivery of the Units, (iii) the
preparation, issuance and delivery of the certificates for the Units to the
Underwriters, including any stock or other transfer taxes and any stamp or other
duties payable upon the sale, issuance or delivery of the Units to the
Underwriters and the transfer of the Units between the Managers and the U.S.
Underwriters, (iv) the fees and disbursements of the Companies' counsel,
accountants and other advisors, (v) the fees and disbursements of SDC's counsel,
accountants and other advisors, (vi) the printing and delivery to the
Underwriters of copies of each preliminary prospectus, any Term Sheets and of
the Prospectuses and any amendments or supplements thereto, (vii) the
preparation, printing and delivery to the Underwriters of copies of the Blue Sky
Survey and any supplement thereto, (viii) the fees and expenses of any transfer
agent or registrar for the Units, (ix) all charges of the Warrant Agent, (x) the
filing fees incident to, and the reasonable fees and disbursements of counsel to
the Underwriters in connection with, the review by the National Association of
Securities Dealers, Inc. (the "NASD") of the terms of the sale of the Units, and
(xi) the fees and expenses incurred in connection with the listing of the Units,
the SDC II Common Stock and the Warrants on the Nasdaq National Market; PROVIDED
that the Underwriters will reimburse SDC II for up to $1,140,000 of expenses
incurred in connection with the Offerings.


                                          22
<PAGE>

    (b)  TERMINATION OF AGREEMENT.  If this Agreement is terminated by the Lead
Manager in accordance with the provisions of Section 5, Section 9(a)(i) or
Section 11, the Companies shall reimburse the Managers for all of their
out-of-pocket expenses, including the reasonable fees and disbursements of
counsel for the Managers.

    SECTION 5.     CONDITIONS OF MANAGERS' OBLIGATIONS.  The obligations of the
several Managers hereunder are subject to the accuracy of the representations
and warranties of the Companies contained in Section 1 hereof or in certificates
of any officer of the Companies or any Subsidiary delivered pursuant to the
provisions hereof, to the performance by the Companies of their covenants and
other obligations hereunder, and to the following further conditions:

         (a)  EFFECTIVENESS OF REGISTRATION STATEMENT.  The Registration
    Statement, including any Rule 462(b) Registration Statement has become
    effective and at Closing Time no stop order suspending the effectiveness of
    the Registration Statement shall have been issued under the 1933 Act or
    proceedings therefor initiated or threatened by the Commission, and any
    request on the part of the Commission for additional information shall have
    been complied with to the reasonable satisfaction of counsel to the
    Managers.  A prospectus containing the Rule 430A Information shall have
    been filed with the Commission in accordance with Rule 424(b) (or a
    post-effective amendment providing such information shall have been filed
    and declared effective in accordance with the requirements of Rule 430A)
    or, if the Companies have elected to rely upon Rule 434, a Term Sheet shall
    have been filed with the Commission in accordance with Rule 424(b).

         (b)  OPINION OF COUNSEL FOR THE COMPANIES.  At Closing Time, the Lead
    Manager shall have received the favorable opinion, dated as of Closing
    Time, of Brobeck, Phleger & Harrison LLP, counsel for Dura and SDC II, in
    form and substance satisfactory to counsel for the Managers, and, to the
    extent provided in Exhibit A hereto, Mitchell R. Woodbury, General Counsel
    for Dura, together with signed or reproduced copies of such letters for the
    other Manager, to the effect set forth in Exhibit A hereto.

         (c)  OPINION OF PATENT COUNSEL FOR THE COMPANIES.  At Closing Time,
    the Lead Manager shall have received the favorable opinion, dated as of
    Closing Time, of Lyon & Lyon LLP (solely with respect to patents concerning
    the Spiros products), patent counsel for the Companies, in form and
    substance satisfactory to counsel for the Managers, together with signed or
    reproduced copies of such letter for the other Manager, to the effect set
    forth in Exhibit B hereto.

         (d)  OPINION OF REGULATORY COUNSEL FOR THE COMPANIES.  At Closing
    Time, the Lead Manager shall have received the favorable opinion, dated as
    of Closing Time, of Kleinfeld, Kaplan and Becker, regulatory counsel for
    the Companies, in form and substance satisfactory to counsel for the
    Managers, together with signed or reproduced copies of such letter for the
    other Manager, to the effect set forth in Exhibit C hereto.


                                          23
<PAGE>

         (e)  OPINION OF COUNSEL FOR THE MANAGERS.  At Closing Time, the Lead
    Manager shall have received the favorable opinion, dated as of Closing
    Time, of Shearman & Sterling, counsel for the Managers, together with
    signed or reproduced copies of such letter for the other Manager, with
    respect to such matters as the Managers may reasonably request.  In giving
    such opinion, such counsel may rely, as to all matters governed by the laws
    of jurisdictions other than the law of the State of New York and the
    federal law of the United States upon the opinions of counsel satisfactory
    to the Lead Manager.  Such counsel may also state that, insofar as such
    opinion involves factual matters, they have relied, to the extent they deem
    proper, upon certificates of officers of the Companies and the Subsidiaries
    and certificates of public officials.

         (f)  OFFICERS' CERTIFICATE.  At Closing Time, there shall not have
    been, since the date hereof or since the respective dates as of which
    information is given in the Prospectuses, any Dura Material Adverse Effect,
    SDC Material Adverse Effect or SDC II Material Adverse Effect, whether or
    not arising in the ordinary course of business, and the Lead Manager shall
    have received a certificate of the President or a Vice President of Dura
    and of the chief financial or chief accounting officer of Dura, and the
    President or a Vice President of SDC II and of the chief financial or chief
    accounting officer of SDC II, dated as of the Closing Time, to the effect
    that (i) there has been no such material adverse effect, (ii) the
    representations and warranties of Dura and SDC II set forth in Section 1(a)
    hereof are true and correct with the same force and effect as though
    expressly made at and as of the Closing Time, (iii) each of Dura and SDC II
    shall have complied with all agreements and satisfied all conditions on its
    part to be performed or satisfied at or prior to Closing Time, and (iv) no
    stop order suspending the effectiveness of the Registration Statement has
    been issued and no proceedings for that purpose have been instituted or are
    pending or are contemplated by the Commission.

         (g)  ACCOUNTANTS' COMFORT LETTER.  At the time of the execution of
    this Agreement, the Lead Manager shall have received from Deloitte & Touche
    LLP a letter, dated such date, in form and substance satisfactory to the
    Lead Manager, together with signed or reproduced copies of such letter for
    the other Manager, containing statements and information of the type
    ordinarily included in accountants' "comfort letters" to underwriters with
    respect to the financial statements and certain financial information
    contained in the Registration Statement and the Prospectuses.

         (h)  BRING-DOWN COMFORT LETTER.  At Closing Time, the Lead Manager
    shall have received from Deloitte & Touche LLP a letter, dated as of
    Closing Time, to the effect that they reaffirm the statements made in the
    letter furnished pursuant to subsection (g) of this Section 5, except that
    the specified date referred to shall be a date not more than three business
    days prior to Closing Time.

         (i)  APPROVAL OF LISTING.  At Closing Time, the Units shall have been
    approved for inclusion in the Nasdaq National Market, subject only to
    official notice of issuance.


                                          24
<PAGE>

         (j)  NO OBJECTION.  The NASD has confirmed that it has not raised any
    objection with respect to the fairness and reasonableness of the
    underwriting terms and arrangements.

         (k)  LOCK-UP AGREEMENTS.  At the date of this Agreement, the Managers
    shall have received an agreement substantially in the form of Exhibit D
    hereto signed by the persons listed on Schedule C hereto.

         (l)  PURCHASE OF INITIAL U.S. UNITS.  Contemporaneously with the
    purchase by the Managers of the Initial International Units under this
    Agreement, the U.S. Underwriters shall have purchased the Initial U.S.
    Units under the U.S. Purchase Agreement.

         (m)  CONDITIONS TO PURCHASE OF INTERNATIONAL OPTION UNITS.  In the
    event that the Managers exercise their option provided in Section 2(b)
    hereof to purchase all or any portion of the International Option Units,
    the representations and warranties of the Companies contained herein and
    the statements in any certificates furnished by the Companies and any
    Subsidiary hereunder shall be true and correct as of each Date of Delivery
    and, at the relevant Date of Delivery, the Lead Manager shall have
    received:

              (i)       OFFICERS' CERTIFICATE.  A certificate, dated such Date
         of Delivery, of the President or a Vice President of each of the
         Companies and of the chief financial or chief accounting officer of
         each of the Companies confirming that the certificate delivered at the
         Closing Time pursuant to Section 5(f) remains true and correct as of
         such Date of Delivery.

              (ii)      OPINIONS OF COUNSEL FOR THE COMPANIES.  The favorable
         opinions of Brobeck, Phleger & Harrison LLP, counsel for the
         Companies, Lyon & Lyon, patent counsel for the Companies, and
         Kleinfeld, Kaplan and Becker, regulatory counsel for the Companies,
         each in form and substance satisfactory to counsel for the Managers,
         dated such Date of Delivery, relating to the International Option
         Units to be purchased on such Date of Delivery and otherwise to the
         same effect as the opinions required by Sections 5(b), 5(c) and 5(d).

              (iii)     OPINION OF COUNSEL FOR THE MANAGERS.  The favorable
         opinion of Shearman & Sterling, counsel for the Managers, dated such
         Date of Delivery, relating to the International Option Units to be
         purchased on such Date of Delivery and otherwise to the same effect as
         the opinion required by Section 5(e).

              (iv)      BRING-DOWN COMFORT LETTER.  A letter from Deloitte &
         Touche LLP, in form and substance satisfactory to the Lead Manager and
         dated such Date of Delivery, substantially in the same form and
         substance as the letter furnished to the Lead Manager pursuant to
         Section 5(h), except that the "specified date" in the


                                          25
<PAGE>

         letter furnished pursuant to this paragraph shall be a date not more
         than five days prior to such Date of Delivery.

         (n)  ADDITIONAL DOCUMENTS.  At Closing Time and at each Date of
    Delivery, counsel for the Managers shall have been furnished with such
    documents and opinions as they may require for the purpose of enabling them
    to pass upon the issuance and sale of the Units as herein contemplated, or
    in order to evidence the accuracy of any of the representations or
    warranties, or the fulfillment of any of the conditions, herein contained;
    and all proceedings taken by the Companies in connection with the issuance
    and sale of the Units as herein contemplated shall be reasonably
    satisfactory in form and substance to the Managers and counsel for the
    Managers.

         (o)  TERMINATION OF AGREEMENT.  If any condition specified in this
    Section 5 shall not have been fulfilled when and as required to be
    fulfilled, this Agreement, or, in the case of any condition to the purchase
    of International Option Units, on a Date of Delivery which is after the
    Closing Time, the obligations of the Managers to purchase the relevant
    International Option Units, may be terminated by the Lead Manager by notice
    to the Companies at any time at or prior to Closing Time or such Date of
    Delivery, as the case may be, and such termination shall be without
    liability of any party to any other party except as provided in Section 4
    and except that Sections 1, 6, 7 and 8 shall survive any such termination
    and remain in full force and effect.

    SECTION 6.     INDEMNIFICATION.

    (a)  INDEMNIFICATION OF MANAGERS.  The Companies, jointly and severally,
agree to indemnify and hold harmless each Manager and each person, if any, who
controls any Manager within the meaning of Section 15 of the 1933 Act or Section
20 of the 1934 Act as follows:

         (i)       against any and all loss, liability, claim, damage and
    expense whatsoever, as incurred, arising out of any untrue statement or
    alleged untrue statement of a material fact contained in the Registration
    Statement (or any amendment thereto), including the Rule 430A Information
    and the Rule 434 Information, if applicable, or the omission or alleged
    omission therefrom of a material fact required to be stated therein or
    necessary to make the statements therein not misleading or arising out of
    any untrue statement or alleged untrue statement of a material fact
    included in any preliminary prospectus or the Prospectuses (or any
    amendment or supplement thereto), or the omission or alleged omission
    therefrom of a material fact necessary in order to make the statements
    therein, in the light of the circumstances under which they were made, not
    misleading;

         (ii)      against any and all loss, liability, claim, damage and
    expense whatsoever, as incurred, to the extent of the aggregate amount paid
    in settlement of any litigation, or any investigation or proceeding by any
    governmental agency or body, commenced or threatened, or of any claim
    whatsoever based upon any such untrue statement or 


                                          26
<PAGE>

    omission, or any such alleged untrue statement or omission; provided that 
    (subject to Section 6(d) below) any such settlement is effected with the 
    written consent of the Companies; and

         (iii)     against any and all expense whatsoever, as incurred
    (including the fees and disbursements of counsel chosen by Merrill Lynch),
    reasonably incurred in investigating, preparing or defending against any
    litigation, or any investigation or proceeding by any governmental agency
    or body, commenced or threatened, or any claim whatsoever based upon any
    such untrue statement or omission, or any such alleged untrue statement or
    omission, to the extent that any such expense is not paid under (i) or (ii)
    above;

PROVIDED, HOWEVER, that this indemnity agreement shall not apply to any loss,
liability, claim, damage or expense to the extent arising out of any untrue
statement or omission or alleged untrue statement or omission made in reliance
upon and in conformity with written information furnished to the Companies by
any Manager through the Lead Manager expressly for use in the Registration
Statement (or any amendment thereto), including the Rule 430A Information and
the Rule 434 Information, if applicable, or any preliminary prospectus or the
International Prospectus (or any amendment or supplement thereto).

    (b)  INDEMNIFICATION OF THE COMPANIES, DIRECTORS AND OFFICERS.  Each
Manager severally agrees to indemnify and hold harmless the Companies, their
directors, each of their officers who signed the Registration Statement, and
each person, if any, who controls either of the Companies within the meaning of
Section 15 of the 1933 Act or Section 20 of the 1934 Act, against any and all
loss, liability, claim, damage and expense described in the indemnity contained
in subsection (a) of this Section 6, as incurred, but only with respect to
untrue statements or omissions, or alleged untrue statements or omissions, made
in the Registration Statement (or any amendment thereto), including the Rule
430A Information and the Rule 434 Information, if applicable, or any preliminary
international prospectus or the International Prospectus (or any amendment or
supplement thereto) in reliance upon and in conformity with written information
furnished to the Companies by such Manager through the Lead Manager expressly
for use in the Registration Statement (or any amendment thereto) or such
preliminary prospectus or the International Prospectus (or any amendment or
supplement thereto).

    (c)  ACTIONS AGAINST PARTIES; NOTIFICATION.  Each indemnified party shall
give notice as promptly as reasonably practicable to each indemnifying party of
any action commenced against it in respect of which indemnity may be sought
hereunder, but failure to so notify an indemnifying party shall not relieve such
indemnifying party from any liability hereunder to the extent it is not
materially prejudiced as a result thereof and in any event shall not relieve it
from any liability which it may have otherwise than on account of this indemnity
agreement.  In the case of parties indemnified pursuant to Section 6(a) above,
counsel to the indemnified parties shall be selected by Merrill Lynch, and, in
the case of parties indemnified pursuant to Section 6(b) above, counsel to the
indemnified parties shall be selected by the Companies.  An indemnifying party
may participate at its own expense in the defense of any such action;


                                          27
<PAGE>

PROVIDED, HOWEVER, that counsel to the indemnifying party shall not (except with
the consent of the indemnified party) also be counsel to the indemnified party.
In no event shall the indemnifying parties be liable for fees and expenses of
more than one counsel (in addition to any local counsel) separate from their own
counsel for all indemnified parties in connection with any one action or
separate but similar or related actions in the same jurisdiction arising out of
the same general allegations or circumstances.  No indemnifying party shall,
without the prior written consent of the indemnified parties, settle or
compromise or consent to the entry of any judgment with respect to any
litigation, or any investigation or proceeding by any governmental agency or
body, commenced or threatened, or any claim whatsoever in respect of which
indemnification or contribution could be sought under this Section 6 or Section
7 hereof (whether or not the indemnified parties are actual or potential parties
thereto), unless such settlement, compromise or consent (i) includes an
unconditional release of each indemnified party from all liability arising out
of such litigation, investigation, proceeding or claim and (ii) does not include
a statement as to or an admission of fault, culpability or a failure to act by
or on behalf of any indemnified party.

    (d)  SETTLEMENT WITHOUT CONSENT IF FAILURE TO REIMBURSE.  If at any time an
indemnified party shall have requested an indemnifying party to reimburse the
indemnified party for fees and expenses of counsel, such indemnifying party
agrees that it shall be liable for any settlement of the nature contemplated by
Section 6(a) effected without its written consent if (i) such settlement is
entered into more than 45 days after receipt by such indemnifying party of the
aforesaid request, (ii) such indemnifying party shall have received notice of
the terms of such settlement at least 30 days prior to such settlement being
entered into and (iii) such indemnifying party shall not have reimbursed such
indemnified party in accordance with such request prior to the date of such
settlement.

    SECTION 7.     CONTRIBUTION.  If the indemnification provided for in
Section 6 hereof is for any reason unavailable to or insufficient to hold
harmless an indemnified party in respect of any losses, liabilities, claims,
damages or expenses referred to therein, then each indemnifying party shall
contribute to the aggregate amount of such losses, liabilities, claims, damages
and expenses incurred by such indemnified party, as incurred, (i) in such
proportion as is appropriate to reflect the relative benefits received by the
Companies on the one hand and the Managers on the other hand from the offering
of the Units pursuant to this Agreement or (ii) if the allocation provided by
clause (i) 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 Companies on the one hand and of the
Managers on the other hand in connection with the statements or omissions that
resulted in such losses, liabilities, claims, damages or expenses, as well as
any other relevant equitable considerations.

    The relative benefits received by the Companies on the one hand and the
Managers on the other hand in connection with the offering of the Units pursuant
to this Agreement shall be deemed to be in the same respective proportions as
the total net proceeds from the offering of the Units pursuant to this Agreement
(before deducting expenses) received by the Companies and


                                          28
<PAGE>

the total underwriting discount received by the Managers, in each case as set
forth on the cover of the International Prospectus, or, if Rule 434 is used, the
corresponding location on the Term Sheet, bear to the aggregate initial public
offering price of the Units as set forth on such cover.

    The relative fault of the Companies on the one hand and the Managers on the
other hand shall be determined by reference to, among other things, whether any
such untrue or alleged untrue statement of a material fact or omission or
alleged omission to state a material fact relates to information supplied by the
Companies or by the Managers and the parties' relative intent, knowledge, access
to information and opportunity to correct or prevent such statement or omission.

    The Companies and the Managers agree that it would not be just and
equitable if contribution pursuant to this Section 7 were determined by pro rata
allocation (even if the Managers were treated as one entity for such purpose) or
by any other method of allocation which does not take account of the equitable
considerations referred to above in this Section 7.  The aggregate amount of
losses, liabilities, claims, damages and expenses incurred by an indemnified
party and referred to above in this Section 7 shall be deemed to include any
legal or other expenses reasonably incurred by such indemnified party in
investigating, preparing or defending against any litigation, or any
investigation or proceeding by any governmental agency or body, commenced or
threatened, or any claim whatsoever based upon any such untrue or alleged untrue
statement or omission or alleged omission.

    Notwithstanding the provisions of this Section 7, no U.S. Underwriter shall
be required to contribute any amount in excess of the amount by which the total
price at which the Units underwritten by it and distributed to the public were
offered to the public exceeds the amount of any damages which such Manager has
otherwise been required to pay by reason of any such untrue or alleged untrue
statement or omission or alleged omission.

    No person guilty of fraudulent misrepresentation (within the meaning of
Section 11(f) of the 1933 Act) shall be entitled to contribution from any person
who was not guilty of such fraudulent misrepresentation.

    For purposes of this Section 7, each person, if any, who controls a Manager
within the meaning of Section 15 of the 1933 Act or Section 20 of the 1934 Act
shall have the same rights to contribution as such Manager, and each director of
each of the Companies, each officer of each of the Companies who signed the
Registration Statement, and each person, if any, who controls the Companies
within the meaning of Section 15 of the 1933 Act or Section 20 of the 1934 Act
shall have the same rights to contribution as the Companies.  The Managers'
respective obligations to contribute pursuant to this Section are several in
proportion to the number of Initial International Units set forth opposite their
respective names in Schedule A hereto and not joint.


                                          29
<PAGE>

    SECTION 8.     REPRESENTATIONS, WARRANTIES AND AGREEMENTS TO SURVIVE
DELIVERY.  All representations, warranties and agreements contained in this
Agreement or in certificates of officers of the Companies or any Subsidiary
submitted pursuant hereto, shall remain operative and in full force and effect,
regardless of any investigation made by or on behalf of any Manager or
controlling person, or by or on behalf of the Companies, and shall survive
delivery of the Units to the Managers.

    SECTION 9.     TERMINATION OF AGREEMENT.

    (a)  TERMINATION; GENERAL.  The Lead Manager may terminate this Agreement,
by notice to the Companies, at any time at or prior to Closing Time (i) if there
has been, since the time of execution of this Agreement or since the respective
dates as of which information is given in the International Prospectus, any Dura
Material Adverse Effect or SDC II Material Adverse Effect, whether or not
arising in the ordinary course of business, or (ii) if there has occurred any
material adverse change in the financial markets in the United States or the
international financial markets, any outbreak of hostilities or escalation
thereof or other calamity or crisis or any change or development involving a
prospective change in national or international political, financial or economic
conditions, in each case the effect of which is such as to make it, in the
judgment of the Lead Manager, impracticable to market the Units or to enforce
contracts for the sale of the Units, or (iii) if trading in any securities of
the Companies has been suspended or materially limited by the Commission or the
Nasdaq National Market, or if trading generally on the American Stock Exchange
or the New York Stock Exchange or in the Nasdaq National Market has been
suspended or materially limited, or minimum or maximum prices for trading have
been fixed, or maximum ranges for prices have been required, by any of said
exchanges or by such system or by order of the Commission, the NASD or any other
governmental authority, or (iv) if a banking moratorium has been declared by
either Federal or New York or California authorities.

    (b)  LIABILITIES.  If this Agreement is terminated pursuant to this Section
9, such termination shall be without liability of any party to any other party
except as provided in Section 4 hereof, and provided further that Sections 1, 6,
7 and 8 shall survive such termination and remain in full force and effect.

    SECTION 10.  DEFAULT BY ONE OR MORE OF THE MANAGERS.  If one or more of the
Managers shall fail at Closing Time or a Date of Delivery to purchase the Units
which it or they are obligated to purchase under this Agreement (the "Defaulted
Units"), the Lead Manager shall have the right, within 24 hours thereafter, to
make arrangements for one or more of the non-defaulting Managers, or any other
underwriters, to purchase all, but not less than all, of the Defaulted Units in
such amounts as may be agreed upon and upon the terms herein set forth; if,
however, the Lead Manager shall not have completed such arrangements within such
24-hour period, then:


                                          30
<PAGE>

         (a)  if the number of Defaulted Units does not exceed 10% of the
    number of Units to be purchased on such date, the non-defaulting Managers
    shall be obligated, each severally and not jointly, to purchase the full
    amount thereof in the proportions that their respective underwriting
    obligations hereunder bear to the underwriting obligations of all
    non-defaulting Managers, or

         (b)  if the number of Defaulted Units exceeds 10% of the number of
    Units to be purchased on such date, this Agreement or, with respect to any
    Date of Delivery which occurs after Closing Time, the obligation of the
    Managers to purchase and of the Companies to sell the International Option
    Units to be purchased and sold on such Date of Delivery shall terminate
    without liability on the part of any non-defaulting Manager.

    No action taken pursuant to this Section 10 shall relieve any defaulting
Manager from liability in respect of its default.

    In the event of any such default which does not result in a termination of
this Agreement or, in the case of a Date of Delivery which is after Closing
Time, which does not result in a termination of the obligation of the Managers
to purchase and the Companies to sell the relevant International Option Units,
as the case may be, either the Managers or the Companies shall have the right to
postpone Closing Time or the relevant Date of Delivery, as the case may be, for
a period not exceeding seven days in order to effect any required changes in the
Registration Statement or Prospectuses or in any other documents or
arrangements.  As used herein, the term "Manager" includes any person
substituted for a Manager under this Section.

    SECTION 11.  DEFAULT BY THE COMPANIES.  If the Companies shall fail at
Closing Time or at the Date of Delivery to sell the number of Units that they
are obligated to sell hereunder, then this Agreement shall terminate without any
liability on the part of any nondefaulting party; PROVIDED, HOWEVER, that the
provisions of Sections 1, 4, 6, 7 and 8 shall remain in full force and effect.
No action taken pursuant to this Section 11 shall relieve the Companies from
liability, if any, in respect of such default.

    SECTION 12.  NOTICES.  All notices and other communications hereunder shall
be in writing and shall be deemed to have been duly given if mailed or
transmitted by any standard form of telecommunication.  Notices to the Managers
shall be directed to the Lead Manager at Ropemaker Place, 25 Ropemaker Street,
London, EC2Y 92Y, England attention of Debs Yates; notices to either of the
Companies shall be directed to them at:

                   Dura Pharmaceuticals, Inc.
                   7475 Lusk Boulevard
                   San Diego, California  92121- 4204
                   Attn:  Mitchell R. Woodbury


                                          31
<PAGE>

    with a copy to:

                   Brobeck, Phleger & Harrison LLP
                   550 West "C" Street, Suite 1300
                   San Diego, California  92101
                   Attn:  Faye H. Russell

    SECTION 13.  PARTIES.  This Agreement shall inure to the benefit of and be
binding upon the Managers and the Companies and their respective successors.
Nothing expressed or mentioned in this Agreement is intended or shall be
construed to give any person, firm or corporation, other than the Managers and
the Companies and their respective successors and the controlling persons and
officers and directors referred to in Sections 6 and 7 and their heirs and legal
representatives, any legal or equitable right, remedy or claim under or in
respect of this Agreement or any provision herein contained.  This Agreement and
all conditions and provisions hereof are intended to be for the sole and
exclusive benefit of the Managers and the Companies and their respective
successors, and said controlling persons and officers and directors and their
heirs and legal representatives, and for the benefit of no other person, firm or
corporation.  No purchaser of Units from any Manager shall be deemed to be a
successor by reason merely of such purchase.

    SECTION 14.   GOVERNING LAW AND TIME.  THIS AGREEMENT SHALL BE GOVERNED BY
AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK.  EXCEPT AS
OTHERWISE SET FORTH HEREIN, SPECIFIED TIMES OF DAY REFER TO NEW YORK CITY TIME.

    SECTION 15.   EFFECT OF HEADINGS.  The Article and Section headings herein
and the Table of Contents are for convenience only and shall not affect the
construction hereof.


                                          32
<PAGE>

    If the foregoing is in accordance with your understanding of our agreement,
please sign and return to each of Dura and SDC II a counterpart hereof,
whereupon this instrument, along with all counterparts, will become a binding
agreement among the Managers, Dura and SDC II in accordance with its terms.

                                  Very truly yours,

                                  DURA PHARMACEUTICALS, INC.


                                  By:  /s/ Cam L. Garner
                                       --------------------------------
                                       Title: Chairman, President & CEO

                                  SPIROS DEVELOPMENT CORPORATION II, INC.


                                  By:  /s/ David S. Kabakoff
                                       --------------------------------
                                       Title: Chairman, President & CEO


CONFIRMED AND ACCEPTED,
    as of the date first above written:


MERRILL LYNCH INTERNATIONAL
DONALDSON, LUFKIN & JENRETTE SECURITIES CORPORATION

By:  MERRILL LYNCH INTERNATIONAL


By: /s/ James G. Jackson, Vice President
    ------------------------------------
          Authorized Signatory


                                          33
<PAGE>

                                     SCHEDULE A


                                                                     Number
                                                                    of Initial
                                                                  International
    Name of Manager                                                   Units
    ---------------                                                   -----

Merrill Lynch International. . . . . . . . . . . . . . . . . . . . .    550,000
Donaldson, Lufkin & Jenrette Securities Corporation. . . . . . . . .    550,000



                                                                      ---------

Total. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  1,100,000
                                                                      ---------
                                                                      ---------


                                      Sch A - 1

<PAGE>

                                      SCHEDULE B


                       SPIROS DEVELOPMENT CORPORATION II, INC.
                              DURA PHARMACEUTICALS, INC.

                                   1,100,000 Units
                              Each Unit Consisting of
   One Share of Callable Common Stock of Spiros Development Corporation II, Inc.
                            and One Warrant to Purchase
       One-Fourth of One Share of Common Stock of Dura Pharmaceuticals, Inc.





    1.   The initial public offering price per International Unit, determined
as provided in Section 2, shall be $16.00.

    2.   The purchase price per International Unit to be paid by the Managers
shall be $14.88, being an amount equal to the initial public offering price set
forth above less $1.12 per International Unit.

    3.   The exercise price of the Warrants shall be $54.84 per share of Dura
Common Stock.


                                      Sch B - 1
<PAGE>

                                      SCHEDULE C


                                    James C. Blair

                                     Julia Brown

                                  Herbert J. Conrad

                                 Joseph C. Cook, Jr.

                                   Chester Damecki

                                    Cam L. Garner

                                    David F. Hale

                                     Malcolm Hill

                                  David S. Kabakoff

                                   Robert W. Keith

                                     Erle T. Mast

                                   James W. Newman

                                 Charles W. Prettyman

                                  Gordon V. Ramseier

                                  Robert K. Schultz
                                   Charles G. Smith

                                   Walter F. Spath

                                   David Sudolsky

                                     Clyde Witham

                                 Mitchell R. Woodbury


                                      Sch C - 1
<PAGE>

                                                                       EXHIBIT A

                 FORM OF OPINION OF COUNSEL FOR DURA, SDC II and SDC
                             TO BE DELIVERED PURSUANT TO
                                     SECTION 5(b)
    [For purposes of this opinion, to be delivered at the Closing Time, the
    term "Subsidiaries" includes SDC.]

    (i)       Each of Dura and SDC II has been duly incorporated and is validly
existing as a corporation in good standing under the laws of the State of
Delaware.

    (ii)      Each of Dura and SDC II has full corporate power and authority to
own or lease its properties and conduct its business as described in the
Registration Statement and Prospectuses and, to enter into and perform its
obligations under the U.S. Purchase Agreement and the International Purchase
Agreement.

    (iii)     Each of Dura and SDC II is duly qualified as a foreign
corporation to transact business and is in good standing in each jurisdiction in
which such qualification is required, whether by reason of the ownership or
leasing of property or the conduct of business, except where the failure so to
qualify or to be in good standing would not result in a Dura Material Adverse
Effect or a SDC II Material Adverse Effect, as the case may be (which opinion as
to Dura may be given by the General Counsel of Dura).

    (iv)      The authorized capital stock of Dura conforms as to legal matters
in all material respects to the description thereof contained in the
Registration Statement and Prospectuses.  The authorized and outstanding shares
of capital stock of Dura are as set forth under the caption "Capitalization" and
have been duly and validly authorized and issued, are fully paid and
non-assessable, and are not subject to any preemptive rights (the opinion called
for by the last sentence of this paragraph (iv) may be given by the General
Counsel of Dura).

    (v)       The authorized, capital stock of SDC II conforms as to legal
matters in all material respects to the descriptions thereof contained in the
Registration Statement and Prospectuses under the caption "Spiros Corp. II
Capital Stock".

    (vi)      The outstanding shares of Special Common Stock of SDC II are as
set forth under the caption "Capitalization" have been duly and validly
authorized and issued, are, to our knowledge, fully paid and nonassessable, and
are not subject to any preemptive rights.

    (vii)     The Warrant Agreement has been duly authorized, executed and
delivered by Dura and constitutes a legal, valid and binding obligation of Dura,
enforceable against Dura in accordance to its terms.


                                         A-1
<PAGE>

    (viii)    The issuance of the Warrants has been duly authorized by Dura
and, when duly executed, issued and delivered by Dura and countersigned by the
Warrant Agent and when payment of the purchase price for the Units has been
made, the Warrants will constitute valid and binding obligations of Dura
entitled to the benefits of the Warrant Agreement.  The Warrants are not subject
to the preemptive rights of any stockholder of Dura.  The Warrants conform as to
legal matters in all material respects to the description thereof contained in
the Registration Statement and the Prospectuses under the caption "Description
of the Warrants."

    (ix)      The shares of Dura Common Stock issuable upon exercise of the
Warrants have been duly and validly reserved for the issuance and, when and if
issued upon such exercise and upon payment of the exercise price, in accordance
with the terms of the Warrant Agreement, will be duly and validly authorized and
issued, will be fully paid and nonassessable, and will not be subject to any
preemptive or similar rights of any stockholder of Dura.

    (x)       The issuance of the SDC II Common Stock has been duly authorized
and, when issued and paid for as part of the Units as contemplated by the U.S.
Purchase Agreement and the International Purchase Agreement, will be validly
issued, fully paid and non-assessable.  Such SDC II Common Stock is not subject
to the preemptive or similar rights of any stockholder of SDC II.

    (xi)      To our knowledge, the Subsidiaries, are Dura's sole subsidiaries.
Each Subsidiary has been duly incorporated and is validly existing as a
corporation in good standing under the laws of the jurisdiction of its
incorporation, has corporate power and authority to own or  lease its properties
and to conduct its business as described in the Registration Statement and
Prospectuses and is duly qualified as a foreign corporation to transact business
and is in good standing in each jurisdiction in which such qualification is
required, whether by reason of the ownership or leasing of property or the
conduct of business, except where the failure so to qualify or to be in good
standing would not result in a Dura Material Adverse Effect; all of the issued
and outstanding capital stock of each Subsidiary and SDC has been duly and
validly authorized and issued, are fully paid and non-assessable and, to the
best of our knowledge and information is owned by Dura free and clear of any
security interest, mortgage, pledge, lien, encumbrance, claim or equity; and
none of the outstanding shares of capital stock of any Subsidiary was issued in
violation of the preemptive rights of any securityholder of such Subsidiary (the
opinion called for by the last sentence of this paragraph (xi) may be given by
the General Counsel of Dura).

    (xii)     Each of the U.S. Purchase Agreement and the International
Purchase Agreement has been duly authorized, executed and delivered by Dura and
SDC II.

    (xiii)    The Registration Statement, including any Rule 462(b)
Registration Statement, has become effective under the Act. Any required filing
of the Prospectuses pursuant to Rule 424(b) has been made in the manner and
within the time period required by Rule 424(b). To our knowledge, no stop order
proceedings suspending the effectiveness of the Registration Statement


                                         A-2
<PAGE>

or any Rule 462(b) Registration Statement have been instituted or threatened or
are pending under the Act.

    (xiv)     All descriptions in the Prospectuses of agreements and other
instruments to which Dura, SDC II or the Subsidiaries are a party are accurate
in all material respects.  We know of no agreements required to be filed or
described in the Prospectuses or the Registration Statements which are not so
filed or described.  To our knowledge, no breach or default exists under any
agreement or instrument to which Dura, SDC II or any Subsidiary is a party and
which is filed as an Exhibit to the Registration Statement or incorporated by
reference therein (the opinion called for by the last two sentences of this
paragraph (xiv) may be given by the General Counsel of Dura and SDC II).

    (xv)      The form of certificate used to evidence the Units complies in
all material respects with all applicable statutory requirements, and the
requirements of the Nasdaq National Market.

    (xvi)     To our knowledge, there is no legal or governmental proceeding
pending or threatened to which Dura, any Subsidiary or SDC II is a party or to
which any of the properties of Dura, any Subsidiary or SDC II is subject that is
required to be described in the Registration Statement or the Prospectuses and
is not so described, or of any statute or regulation, contract or other document
that is required to be described in the Registration Statement or the
Prospectuses or to be filed as an exhibit to the Registration Statement that is
not described or filed as required.

    (xvii)    The statements in the Registration Statement under Item 14, to
the extent that such statements constitute matters of law, summaries of
documents contained therein or summaries of legal matters have been prepared by
or reviewed by us and are correct in all material respects.

    (xviii)   The September 30, 1997 offer and sale of 1,000 shares of SDC II
Common Stock with an aggregate value of $1,000 by SDC II to Dura was exempt from
the registration requirements of Section 5 of the 1933 Act by virtue of Section
4(2) and/or Regulation D promulgated thereunder.

    (xix)     None of Dura, any Subsidiary or SDC II is in violation of its
charter or by-laws and no default by Dura or any subsidiary exists in the due
performance or observance of any material obligation, agreement, covenant or
condition contained in any contract, indenture, mortgage, loan agreement, note,
lease or other agreement or instrument that is described or referred to in the
Registration Statement or the Prospectuses or filed or incorporated by reference
as an exhibit to the Registration Statement (which opinion as to Dura may be
given by the General Counsel of Dura).


                                         A-3
<PAGE>

    (xx)      No filing with, or authorization, approval, consent, license,
order, registration, qualification or decree of, any court or governmental
authority or agency, domestic or foreign, (other than under the Act and the 1933
Act Regulations, which have been obtained, or as may be required under the
securities or blue sky laws of the various states or any foreign jurisdiction,
as to which no opinion is requested or given) is necessary or required in
connection with the due authorization, execution and delivery of the Purchase
Agreements or the offering, issuance, sale or delivery of the Units, the SDC II
Common Stock, the Warrants, or the Dura Common Stock issuable upon exercise of
the Warrants.

    (xxi)     The execution, delivery by Dura of, and the performance by Dura
of its obligations under the U.S. Purchase Agreement or the International
Purchase Agreement and the Warrant Agreement and the issuance and sale of the
Units contemplated thereby will not contravene any provision of applicable law
or the certificate of incorporation or bylaws of Dura or any Subsidiaries, or,
to our knowledge, any judgment, order or decree of any governmental body, agency
or court having jurisdiction over Dura or any of its property or any
Subsidiaries or any of their property, or, to our knowledge, constitute a breach
or default or a Dura Repayment Event (as defined in section 1(a)(xi) of the U.S.
Purchase Agreement) under any agreement or other instrument binding upon Dura or
any of the Subsidiaries, to which Dura or any of the Subsidiaries is a party and
filed as an exhibit to the Registration Statement or an Incorporated Document.

    (xxii)    The execution, delivery by SDC II of, and the performance by SDC
II of its obligations under the U.S. Purchase Agreement and the International
Purchase Agreement and the issuance and sale of the Units contemplated thereby
will not contravene any provision of applicable law or the certificate of
incorporation or bylaws of SDC II, or, to our knowledge, any judgment, order or
decree of any governmental body, agency or court having jurisdiction over SDC II
or any of its property, or, to our knowledge, constitute a breach or default or
a SDC II Repayment Event (as defined in section 1(a)(xii) of the U.S. Purchase
Agreement) under any agreement or other instrument binding upon SDC II, to which
SDC II is a party and filed as an exhibit to the Registration Statement or an
Incorporated Document.

    (xxiii)   Each of the Major Agreements has been duly authorized, executed
and delivered by Dura, SDC, DDSI and SDC II as applicable.

    (xxiv)    No holders of securities of Dura have rights against Dura which
have not been waived to the registration of shares of Dura Common Stock or other
securities, because of the filing of the Registration Statement by Dura or the
offering contemplated thereby (which opinion may be given by the General Counsel
of Dura).

    (xxv)     The Units have been duly authorized for quotation on the Nasdaq
National Market, upon notice of official issuance.


                                         A-4
<PAGE>

    (xxvi)    The statements in the Registration Statement and Prospectuses
under the caption "United States Federal Income Tax Consequences" and "United
States Taxation of Non-U.S. Persons" to the extent they constitute matters of
law or legal conclusions with respect thereto, have been prepared or reviewed by
us and are correct in all material respects.

    (xxvii)   Neither Dura nor SDC II is an "investment company" or an entity
"controlled" by an "investment company", as such terms are defined in the 1940
Act.

         In addition to the foregoing, (i) we believe that each of the
Incorporated Documents (except for financial statements and schedules and other
financial data included therein or omitted therefrom, as to which no opinion is
requested or given), when they became effective or were filed with the
Commission, as the case may be, complied as to form when filed with the
Commission in all material respects with the requirements of the Act and the
1934 Act, as applicable, and the rules and regulations of the Commission
thereunder; (ii) we believe that the Registration Statement, the Prospectuses
and each amendment or supplement to the Registration Statement and Prospectuses
(except for financial statements and schedules and other financial data included
or incorporated by reference therein or omitted therefrom, as to which no
opinion is requested or given), as of their respective effective or issue dates,
complied as to form in all material respects with the requirements of the Act
and the applicable rules and regulations of the Commission thereunder; (iii) we
confirm that nothing has come to our attention that has caused us to conclude
that (except for financial statements and schedules and other financial data
included or incorporated by reference therein or omitted therefrom, as to which
we need make no statement) the Registration Statement or any amendment thereto,
including the Rule 430A Information and Rule 434 Information (if applicable), at
the time such Registration Statement or any such 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,
in the lights of the circumstances under which they were made, not misleading or
that (except for financial statements and schedules and other financial data
included or incorporated by reference therein or omitted therefrom, as to which
we need make no statement) the Prospectuses, on the date hereof, include an
untrue statement of a material fact or omits to state a material fact necessary
in order to make the statements therein, in light of the circumstances under
which they were made not misleading.

         In rendering such opinion, such counsel may rely (A) upon the opinions
of Lyon & Lyon and Kleinfeld, Kaplan & Becker and Mitchell R. Woodbury, Esq.
(which opinion may rely, to the extent appropriate, on the opinions of Conyers
Dill & Pearman, Bermuda counsel for Dura (Bermuda) Trading Company Ltd., and
Chancery Chambers, Barbados counsel for Dura (Barbados) Holding Company Ltd. and
Dura (Barbados) Ltd.) with respect to the matters opined upon by each, and (B),
as to matters of fact (but not as to legal conclusions), to the extent they deem
proper, on certificates of responsible officers of Dura or SDC II and public
officials. Such opinion shall be subject to standard limitations, exclusions,
qualifications and assumptions.   Such opinion shall not state that it is to be
governed or qualified by, or that it is otherwise subject to, any treatise,
written policy or other document relating to legal opinions, including, without
limitation, the Legal Opinion Accord of the ABA Section of Business Law (1991).


                                         A-5
<PAGE>

                                                                       EXHIBIT B


                          FORM OF OPINION OF PATENT COUNSEL
                FOR DURA AND SDC II DELIVERED PURSUANT TO SECTION 5(C)


         (i)  Dura owns U.S. patents and U.S. Foreign patent applications which
    are directed to Spiros and to certain uses of the Spiros product necessary
    to protect the business of Dura and Spiros Corp. II as described in the
    Prospectuses.  With regard to the business presently and as proposed to be
    conducted by Dura and Spiros Corp. II relating to the Spiros product as
    described in the Registration Statement and the Prospectuses, and, except
    as described therein, we have not received any notice of infringement of or
    conflict with, and does not otherwise know of any basis for notice of any
    such infringement of or conflict with, asserted rights of others with
    respect to any patents, trademarks, service marks, trade names, copyrights,
    technology or know-how relating to the Spiros product.

         (ii) To the extent that the statements relating to the Spiros product
    contained in the Registration Statement and Prospectuses under the
    subheadings "Risk Factors--Business Risks Related to Spiros Corp. II and
    Dura--Uncertainty Regarding Patents and Proprietary Technology;
    Unpredictability of Patent Protection - Spiros Corp. II," "Risk Factors -
    Business Risks Related to Spiros Corp. II and Dura -- Uncertainty Regarding
    Patents and Proprietary Technology; Unpredicability of Patent Protection -
    Dura," and the first paragraph of "Business of Spiros Corp. II -- Patents"
    refer to opinions of counsel or matters of law, patents or patent
    applications or purport to summarize the status of litigation or the
    provisions of statutes, regulations, contracts, agreements or other
    documents, such statements (A) have been prepared or reviewed by us and
    accurately reflect the status of any such patent applications, litigation,
    the provisions purported to be summarized and any of our opinions and (B)
    do not contain any untrue statements of a material fact or omit to state
    any material fact required to be stated therein or necessary to make the
    statements therein not misleading.


                                         B-1
<PAGE>

                                                                       EXHIBIT C


                        FORM OF OPINION OF REGULATORY COUNSEL
                                 FOR DURA AND SDC II
                              TO BE DELIVERED PURSUANT
                                   TO SECTION 5(d)


         (i)       The descriptions in the Registration Statement of the
    statutes, regulations and legal or governmental proceedings or procedures
    relating to the FDA and the approval process relating to the products of
    Dura and SDC II are accurate in all material respects and are a fair
    summary of those statutes, regulations, proceedings or procedures.

         (ii)      Nothing has come to our attention that leads us to believe
    that the descriptions of federal laws, regulations or rules relating to the
    manufacture or sale of Dura's products and the approval process relating
    thereto contained in the Registration Statement and the Prospectuses,
    including, without limitation, the portions of the Registration Statement
    and Prospectuses entitled "Risk Factors - Business Risks Related to Spiros
    Corp, II and Dura - Government Regulation;  No Assurance of FDA Approval,"
    and "Business of Dura - Government Regulation," 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 statement therein not misleading.

         (iii)     We have no reason to believe that Dura's current business is
    not being conducted in material compliance with currently applicable
    requirements under the Federal Food, Drug and Cosmetic Act or that the FDA
    is currently considering taking action that would result in withdrawal from
    marketing of any of Dura's currently marketed products.


                                         C-1
<PAGE>

                                                                       EXHIBIT D


                                       October     , 1997

MERRILL LYNCH & CO.
Merrill Lynch, Pierce, Fenner & Smith
            Incorporated
DONALDSON, LUFKIN & JENRETTE SECURITIES CORPORATION
    as Representatives of the several
    Underwriters to be named in the
    within mentioned Purchase Agreement
c/o Merrill Lynch & Co.
Merrill Lynch, Pierce, Fenner & Smith
            Incorporated
North Tower
World Financial Center
New York, New York  10281-1209


    Re:  Proposed Public Offering by Dura Pharmaceuticals, Inc. and Spiros
         Development Corporation II

Ladies and Gentlemen:

    The undersigned, a stockholder and/or officer and/or director of Dura
Pharmaceuticals, Inc. ("Dura") understands that Merrill Lynch & Co. ("Merrill
Lynch") and Donaldson, Lufkin & Jenrette ("DLJ") propose to enter into a
Purchase Agreement (the "Purchase Agreement") with Dura and Spiros Development
Corporation II ("SDC II") that will provide for the public offering of units
comprised of the common stock of SDC II and warrants to purchase Dura's common
stock (the "Securities").  In recognition of the benefit that such an offering
will confer upon the undersigned as a stockholder and/or officer and/or director
of Dura, and for other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the undersigned agrees with each
underwriter to be named in the Purchase Agreement that, during a period of
ninety (90) days from the date of the Purchase Agreement, the undersigned will
not, without the prior written consent of Merrill Lynch, directly or indirectly,
(i) sell, offer to sell, pledge, contract to sell, sell any option or contract
to purchase, purchase any option or contract to sell, grant any option, right or
warrant for the sale of, or otherwise dispose of or transfer any shares of
Dura's common stock (the "Dura Common Stock"), or any securities convertible
into or exchangeable or exercisable for Dura Common Stock, whether now owned or
hereafter acquired by the undersigned, or with respect to which the undersigned
has or hereafter acquires the power of disposition, or file, participate in, or
request the filing of any registration statement under the Securities Act of
1933, as amended, with respect to any of the foregoing or (ii) enter into any
swap or any other agreement or any transaction that transfers, in whole or in
part,


                                         D-1
<PAGE>

directly or indirectly, the economic consequence of ownership of Dura Common
Stock, whether any such swap or transaction is to be settled by delivery of Dura
Common Stock or other securities, in cash or otherwise.

                                  Very truly yours,



                                  Signature:
                                             ------------------------

                                  Print Name:
                                              -----------------------


                                         D-2


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