SPIROS DEVELOPMENT CORP II INC
10-K, 1998-03-30
PHARMACEUTICAL PREPARATIONS
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                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549

                                  FORM 10-K

  X         ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
- -----            SECURITIES EXCHANGE ACT OF 1934

                     For fiscal year ended December 31, 1997

                                     OR

            TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF
- -----       THE SECURITIES EXCHANGE ACT OF 1934 (NO FEE REQUIRED)


            For the transition period from ________ to ________.

                        COMMISSION FILE NUMBER: 000-23501

                     SPIROS DEVELOPMENT CORPORATION II, INC.
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)

                DELAWARE                                 33-0774288
      (State or other jurisdiction                    (I.R.S. Employer
    or incorporation or organization)                Identification No.)

   7475 LUSK BLVD., SAN DIEGO, CALIFORNIA                   92121
  (Address of principal executive offices)               (zip code)


  Registrant's telephone number, including area code (619) 457-2553

              SECURITIES REGISTERED PURSUANT TO SECTION 12(B) OF
                               THE ACT: NONE

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

CALLABLE COMMON STOCK, $.001 PAR VALUE. THE CALLABLE COMMON STOCK IS REGISTERED
PURSUANT TO SECTION 12(G) OF THE ACT SEPARATELY AND AS PART OF UNITS, EACH UNIT
CONSISTING OF ONE SHARE OF CALLABLE COMMON STOCK OF SPIROS DEVELOPMENT
CORPORATION II, INC. AND ONE WARRANT (A "WARRANT") TO PURCHASE ONE-FOURTH OF ONE
SHARE OF DURA PHARMACEUTICALS, INC. COMMON STOCK. THE CALLABLE COMMON STOCK IS
NOT SEPARATELY TRADABLE APART FROM THE UNITS PRIOR TO DECEMBER 31, 1999 OR UPON
THE EARLIER OCCURRENCE OF CERTAIN EVENTS.

     Indicate by check mark whether the registrant (1) has filed all reports 
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 
1934 during the preceding 12 months (or for such shorter period that the 
registrant was required to file such reports), and (2) has been subject to 
such filing requirements for the past 90 days. Yes X  No   .
                                                  ---   --- 

<PAGE>

     Indicate by check mark if disclosure of delinquent filers pursuant to 
Item 405 of Regulation S-K is not contained herein, and will not be 
contained, to the best of registrant's knowledge, in definitive proxy or 
information statements incorporated by reference in Part III of this Form 
10-K or any amendment to this Form 10-K [ ].

     The aggregate market value of the Units held by non-affiliates of the 
registrant as of February 27, 1998 was $77,902,555. Market value is the 
market value of the Units, each Unit consisting of one share of Callable 
Common Stock of Spiros Development Corporation II, Inc. and a Warrant. There 
is no quoted market value for the shares of Callable Common Stock apart from 
the Units. For the purposes of this calculation, shares owned by officers, 
directors (and their affiliates) and 10% or greater shareholders known to the 
registrant have been deemed to be affiliates which should not be construed to 
indicate that any such person possesses the power, direct or indirect, to 
direct or cause the direction of the management or policies of the Registrant 
or that such person is controlled by or under common control with the 
Registrant.

     The number of shares of the Registrant's Callable Common Stock and 
Special Common Stock outstanding as of February 27, 1998 were 6,325,000 and 
1,000, respectively.

DOCUMENTS INCORPORATED BY REFERENCE

     Portions of Registrant's Proxy Statement for the Annual Meeting of 
Shareholders scheduled to be held on May 20, 1998, to be filed with the 
Securities and Exchange Commission on or about April 9, 1998, referred to 
herein as the "Proxy Statement," are incorporated as provided in Part III.

<PAGE>


                                      INDEX
 
Part I:
        Item 1.  Business......................................................4
        Item 2.  Properties...................................................24
        Item 3.  Legal Proceedings............................................24
        Item 4.  Submission of Matters to a Vote of Security Holders..........24


Part II:
        Item 5.  Market for Registrant's Common Equity and Related
                 Shareholder Matters..........................................24
        Item 6.  Selected Financial Data......................................25
        Item 7.  Management's Discussion and Analysis of Financial
                 Condition and Results of Operations..........................26
        Item 7A. Quantitative and Qualitative Disclosures about Market Risk...27
        Item 8.  Financial Statements and Supplementary Data..................27
        Item 9.  Changes in and Disagreements with Accountants on
                 Accounting and Financial Disclosure..........................27

Part III:
        Item 10. Directors and Executive Officers of the Registrant...........27
        Item 11. Executive Compensation.......................................28
        Item 12. Security Ownership of Certain Beneficial Owners and
                 Management...................................................28
        Item 13. Certain Relationships and Related Transactions...............28

Part IV:
        Item 14. Exhibits, Financial Statement Schedules and Reports on
                 Form 8-K.....................................................28

                 Signatures...................................................30



<PAGE>

                                     PART I

ITEM 1.   BUSINESS

The discussion of Spiros Development Corporation II, Inc.'s ("Spiros Corp. 
II" or the "Company") business contained in this report may contain certain 
projections, estimates and other forward-looking statements that involve a 
number of risks and uncertainties. For a discussion of factors which may 
affect the outcome projected in such statements, see "Risks and 
Uncertainties" on pages 18 through 24 of this Annual Report on Form 10-K. 
While this outlook represents management's current judgment on the future 
direction of the business, such risks and uncertainties could cause actual 
results to differ materially from any future performance listed below. The 
Company undertakes no obligation to release publicly the results of any 
revisions to these forward-looking statements to reflect events and 
circumstances arising after the date hereof. Unless the context otherwise 
requires, "Dura" refers to Dura Pharmaceuticals, Inc., a Delaware 
corporation, and its subsidiaries.

OVERVIEW

The Company was incorporated in the state of Delaware on September 23, 1997 
to continue the development of Spiros-Registered Trademark-, a dry powder 
pulmonary drug delivery system, and to conduct formulation work, clinical 
trials and commercialization for certain specified leading asthma and chronic 
obstructive pulmonary disease ("COPD") drugs for use with Spiros. Spiros 
Corp. II may also expend funds on enhancements to the existing Spiros 
technology, initial development of a next generation inhaler system and the 
acquisition of capital equipment to be used in the manufacture of the Spiros 
Products. Finally, Spiros Corp. II plans to use a portion of its funding to 
conduct technical evaluation projects designed to identify additional 
respiratory drug candidates for further development. The Company commenced 
operations on December 22, 1997.

On December 22, 1997, the Company and Dura Pharmaceuticals, Inc. ("Dura") 
completed a $101 million initial public offering (the "Offering") of 
6,325,000 Units, each Unit consisting of one share of callable common stock 
of the Company (the "Common Stock") and one warrant (the "SDCII Warrants") to 
purchase one-fourth of one share of Dura's common stock. The offering 
resulted in net proceeds to the Company of approximately $94 million. 
Concurrently, Dura contributed $75 million to the Company. Substantially all 
funds from the Offering, the $75 million contribution and interest earned 
thereon (the "Available Funds"), are expected to be paid to Dura for the 
development and commercialization of Spiros and the use of Spiros with 
applications for albuterol, beclomethasone, ipratropium, 
albuterol-ipratropium combination, budesonide and additional designated 
compounds (the "Compounds"). In addition, the Company may also expend funds 
on enhancements to the existing Spiros technology, the acquisition of capital 
equipment to be used in the manufacture of the Spiros products, or to conduct 
technical evaluation projects designed to identify additional respiratory 
drug candidates for further development in Spiros. The SDCII Warrants will be 
exercisable from January 1, 2000 through December 31, 2002 at an exercise 
price of $54.84 per share of Dura common stock. In consideration of the SDCII 
Warrants and the contribution of $75 million to Spiros Corp. II, Dura has an 
irrevocable option (the "Purchase Option") through December 31, 2002, to 
purchase all, but not less than all, of the then outstanding shares of Spiros 
Corp. II callable common stock at predetermined prices. However, Dura is not 
obligated to purchase such shares of Spiros Corp. II. Such purchase price may 
be paid, at Dura's option, in cash, shares of Dura's common stock, or a 
combination thereof. In addition, Dura received an option through specified 
dates, to acquire Spiros Corp. II's exclusive rights for the use of Spiros 
with albuterol (the "Albuterol Option") and with a second product other than 
albuterol (the "Product Option") for cash.

In connection with the Offering, the Company also entered into the Technology 
License Agreement, Albuterol and Product Option Agreement, Development 
Agreement, Manufacturing and Marketing Agreement, and Services Agreement as 
further discussed below under "Relationship with Dura."

Spiros Corp. II is not expected to have its own research, development, 
clinical, licensing, administration, manufacturing or marketing employees or 
facilities and thus will be entirely dependent on Dura in these areas.

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ASTHMA AND COPD MARKET

Asthma is a complex physiological disorder characterized by airway 
hyperactivity to a variety of stimuli such as dust, pollen, stress or 
physical exercise, resulting in airway obstruction that is partially or 
temporarily reversible. The number of people with asthma has grown steadily 
in recent years and is now believed to be over 200 million worldwide. COPD is 
a complex condition comprising a combination of chronic bronchitis, emphysema 
and airway obstruction. The U.S. combined market for therapeutic drugs to 
treat asthma and COPD was approximately $2.9 billion in 1997. The primary 
categories of therapeutic drugs used in the treatment of asthma and COPD 
include bronchodilators and anti-inflammatories. Bronchodilators dilate the 
airways and include beta agonists (such as albuterol and bitolterol), 
xanthines (such as theophylline) and anticholinergics (such as ipratropium). 
Anti-inflammatories reduce inflammation and include steroids (such as 
beclomethasone, budesonide, flunisolide and triamcinolone).

PULMONARY DRUG DELIVERY SYSTEMS

Inhaled therapeutic drugs have been shown to be effective in treating or 
preventing the symptoms of asthma, COPD and other respiratory diseases. When 
treating respiratory diseases, inhalation delivery puts the drug directly 
into the lung for topical treatment. If administered in capsule, tablet or 
liquid form, rather than through inhalation, the patient must take sufficient 
drug to achieve a systemic therapeutic blood level to benefit the lungs. In 
many instances, this may cause serious side effects by impacting other 
organs. Because inhaled therapy delivers the drug directly into the lung, it 
provides comparable efficacy with less risk of systemic side effects at 
greatly reduced dosages. Inhalation delivery also yields a fast onset of 
action, hastening the time for patient relief.

TRADITIONAL INHALATION DELIVERY DEVICES

Traditional delivery systems used for administering inhaled drugs include the 
following:

JET NEBULIZERS. Jet nebulizers aerosolize a liquid solution of medicine, 
either ultrasonically or with compressed air, creating a fine mist that 
patients inhale slowly over several minutes. Jet nebulizers are larger than 
other inhalation delivery systems and, because of their size, are primarily 
used to deliver aerosol to hospitalized patients, patients with acute asthma 
exacerbation in a clinic or emergency room environment, and patients unable 
to coordinate the use of other inhalation delivery technology.

METERED DOSE INHALERS. Metered dose inhalers ("MDIs") are the most popular 
inhalation delivery system due to their relative convenience and portability. 
MDIs consist of a suspension or solution of drug filled into a canister which 
is sealed with a metering valve and pressurized using a propellant, most 
commonly a chlorofluorocarbon ("CFC"). Because MDIs contain an internal 
energy source, the CFCs, the operation is relatively flow rate independent, 
and the dose exiting the MDI is relatively consistent. However, it is 
estimated that only 10 to 20 percent of the dose from an MDI actually 
deposits in the lung. The variation in lung deposition is in large part 
reflected by the inability of most patients to coordinate actuation of the 
system with inhalation.

DRY POWDER INHALERS. Dry powder inhalers ("DPIs") represent a significant 
advancement in the development of inhalation delivery systems. Dry powder 
inhalers are relatively convenient and portable, and are CFC-free. DPIs are 
breath actuated, so they eliminate the need for hand-lung coordination 
associated with MDIs. Although DPIs overcome the need for coordination of 
actuation and inspiration, currently marketed DPIs require high inspiratory 
flow rates and the ultimate dose delivered to the patient is dependent on 
inspiratory flow rate. This high inspiratory flow rate is difficult to 
achieve for pediatrics, the elderly and patients in acute respiratory 
distress.

SPIROS

Spiros is a proprietary pulmonary drug delivery system that is designed to
aerosolize pharmaceuticals in dry powder formulations for delivery to the lungs
while providing certain advantages over traditional pulmonary delivery systems.
The Company believes new inhalation systems will gradually replace MDIs as the
leading pulmonary delivery systems, due primarily to the phasing out of CFCs and
coordination problems associated with many MDIs. Many companies are

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<PAGE>

studying alternative propellants, such as hydrofluorocarbons ("HFAs"), for 
use in MDIs, and the first albuterol MDI using an HFA propellant has obtained 
the United States Food and Drug Administration ("FDA") approval and is being 
marketed by Schering-Plough. However, the Company believes that any product 
utilizing alternative propellants will still suffer from many of the 
limitations of currently marketed MDIs, including the need for patients to 
coordinate breathing with actuation of the drug delivery system. There are 
two types of DPIs currently in commercial use worldwide, individual dose and 
multiple dose. Individual dose DPIs currently marketed in the U.S. include 
the Rotohaler-TM- (developed and marketed by Glaxo Wellcome, Inc. ("Glaxo")) 
and the Spinhaler-Registered Trademark- (developed and marketed by Fisons 
Limited). The Turbuhaler-Registered Trademark- (developed and marketed by 
Astra Pharmaceuticals ("Astra")), a multiple dose DPI, is the leading DPI in 
worldwide sales. In June 1997, the FDA approved the first Turbuhaler product, 
the Pulmicort Turbuhaler, for marketing in the U.S., which Astra launched in 
early 1998. Recently the FDA also approved two multiple dose DPIs developed 
by Glaxo.

POTENTIAL ADVANTAGES OF SPIROS. The Company believes Spiros may have certain 
advantages over other currently used methods of pulmonary drug delivery 
including:

        INSPIRATORY FLOW RATE INDEPENDENCE. Spiros is designed to deliver a
        relatively consistent drug dose to the lungs over a wide range of
        inspiratory flow rates, which can vary depending on a patient's health,
        effort or physical abilities. Tests of Spiros on human subjects have
        shown a relatively consistent and significant level of drug deposition
        throughout the clinically relevant inspiratory range. Existing DPIs can
        vary significantly in their level of drug deposition depending on the
        patient's inspiratory flow rate and can deliver significantly less drug
        at the lower flow rates typically associated with asthma attacks.

        MINIMUM NEED FOR PATIENT COORDINATION. Spiros is breath-actuated and
        does not require the user to coordinate inhalation and actuation of the
        drug delivery system. MDIs generally require users to coordinate their
        breathing with actuation of the MDI. Studies indicate that a significant
        percentage of patients, particularly young children and the elderly, do
        not use MDIs correctly. Spiros is designed to solve these coordination
        problems by delivering the drug to patient's lungs as they inhale.

        REDUCED SIDE EFFECTS. Spiros is designed to efficiently deliver drugs to
        the lungs, thereby reducing drug deposition to the mouth and throat
        which could reduce the possibility of unwanted side effects of certain
        pharmaceutical agents, such as coughing and local irritation. With MDIs,
        a significant portion of the dose is delivered to the mouth and throat
        and is swallowed.

        PATIENT CONVENIENCE. Spiros is designed to be convenient for patients,
        with features such as breath actuation (Spiros is triggered by
        inhalation), portability (light weight and small size), quick delivery
        time, simple operation, dose delivery feedback and multi-dose
        capability. Spiros also allows the patient to see the actual number of
        doses remaining in a cassette or blister pack and an LED light provides
        a warning of the need to replace Spiros prior to the end of its useful
        life.

        FREE OF CHLOROFLUOROCARBON PROPELLANTS. CFC propellants have ozone
        destructive characteristics and are subject to worldwide regulations
        aimed at eliminating their usage within the decade. Spiros does not use
        CFCs while most MDIs, currently the most popular form of aerosol drug
        delivery, use CFCs. Virtually all of the world's industrial nations,
        under the auspices of the United Nations Environmental Program, have
        pledged to cease use of CFCs by the year 2000. Continued use of CFCs in
        medical products has been permitted under annual exemptions. As a result
        of the planned phase out of CFCs, the Company believes that DPIs will
        become a leading method for pulmonary drug delivery.

CORE SPIROS TECHNOLOGY

The core technology contained in Spiros which gives rise to the flow rate 
independent delivery is an aerosol generator that uses electromechanical 
energy to disperse dry powder to form an aerosol for inhalation. The main 
components of the aerosol generator include the impeller, the motor, the 
breath actuated switch, and the dosing chamber. When the switch is activated, 
the electric circuit is completed and the impeller rotates. The action of the 
impeller on the dry powder formulation supplies the energy to disperse the 
drug and provide a zero-velocity cloud of aerosolized drug for

                                       6
<PAGE>

inhalation. The cloud of aerosolized drug is suspended in the dosing chamber 
and is delivered to the lungs only as the patient inhales.

Two separate Spiros systems are currently under development, both utilizing 
the same core technology with distinct powder storage systems ("PSS"). 
Because of the physical and chemical requirements of the specific drugs 
deliverable by Spiros, as well as the varying needs of the patients and 
marketplace, the Company believes that its cassette and blisterdisk systems 
will provide flexibility for delivery of many different types of drugs.

CASSETTE SYSTEM. The cassette system was the first Spiros system developed. 
The PSS in this system is a 30-dose plastic cassette packed in a foil pouch. 
In order to take a dose using the cassette system, the patient first opens 
the lid of the Spiros generator to load the cassette. When the lid is closed 
the cassette rotates to deliver a dose of drug into the dosing chamber. The 
dosing chamber contains the impeller. When the patient inhales through the 
mouthpiece, the impeller is automatically activated. The action of the 
impeller on the powder in the chamber generates the aerosol which the patient 
inhales. The patient then closes the lid. When the 30-dose cassette is empty, 
the patient opens the lid and presses an ejection button on the bottom of the 
system to remove an empty cassette and load a new cassette.

The Spiros cassette system has been produced in clinical trial quantities and 
is being used in ongoing clinical trials of albuterol and beclomethasone. 
Dura is currently working with outside vendors on Spiros Corp. II's behalf to 
complete the necessary tooling for commercial scale production.

BLISTERDISK SYSTEM. Once a cassette is removed from the foil package it is no 
longer protected from fluctuations in the relative humidity. Although some 
drugs and powder formulations are sufficiently stable using the cassette 
system, many other dry powders are sensitive to relative humidity. In those 
cases, exposure to moisture causes agglomeration of the powder which can no 
longer be readily aerosolized to the required aerodynamic diameter. The 
blisterdisk system is being developed for drugs that require a barrier 
against moisture or light. This system utilizes powder-filled sealed foil 
blisters which prevent moisture build-up into the powder. The blisterdisk 
system has been designed to contain 16 doses per blisterdisk and is believed 
to be sufficiently flexible to accommodate a wide variety of drugs. In order 
to take a dose using the blisterdisk system, the patient will open the 
mouthpiece cover, push a button to open the blister and inhale through the 
mouthpiece to actuate the impeller and aerosolize the dose. As the patient 
closes the mouthpiece cover, the next blister is advanced to the dosing 
position.

The Spiros blisterdisk system design has evolved to the prototype stage and 
units that are suitable for laboratory testing have been produced. Further 
refinements in the design of this system aimed at producing units suitable 
for clinical trials are in progress.

SPIROS PRODUCTS IN DEVELOPMENT

Spiros Corp. II has selected five compounds to develop for delivery through 
Spiros: a beta-agonist (albuterol), two steroids (beclomethasone and 
budesonide), an anticholinergic (ipratropium) and a combination of a 
beta-agonist and an anticholinergic (albuterol-ipratropium). There can be no 
assurance that the pharmaceutical products currently in development by Spiros 
Corp. II or that any products that may be developed in the future will be 
approved by the FDA. In addition, there can be no assurance that FDA review 
or other actions will not involve delays that could adversely affect the time 
to market and the sale of the products.

ALBUTEROL. Albuterol, a beta-agonist, provides rapid symptomatic relief of 
reversible bronchospasm. When administered by inhalation, it produces 
significant bronchodilation promptly and its effects are demonstrable for a 
number of hours. Albuterol is the most widely accepted asthma medication in 
the world. The leading branded MDI products are Proventil, sold by 
Schering-Plough, and Ventolin, sold by Glaxo. In 1997, U.S. sales of 
albuterol were approximately $700 million as measured by average wholesale 
prices.

In 1994, an Investigational New Drug ("IND") application was filed with the 
FDA to begin clinical testing of an albuterol dry powder formulation with the 
Spiros cassette system. In April 1996, dosing of subjects in a clinical trial 
focusing on dose selection using a formulation of powdered albuterol with 
Spiros was completed. In March 1997,

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<PAGE>

patient dosing was completed in long-term and short-term pivotal clinical 
trials. In November 1997, Dura submitted an New Drug Application ("NDA") with 
the FDA for albuterol in the Spiros cassette system. In January, 1998 the FDA 
informed Dura that the application was accepted for filing. The NDA includes 
the results of clinical trials that were designed to demonstrate 
comparability of the Spiros delivery system to a leading branded albuterol 
MDI product. Three pivotal studies, in addition to a number of dose finding 
and performance verification studies, were conducted for the submission.

An open label study of albuterol in the Spiros cassette system is currently 
in progress. Interim results of this study were provided to the FDA in the 
NDA and results of the full study must be submitted to and reviewed by the 
FDA prior to product approval. Dura, on behalf of Spiros Corp. II, is 
planning market launch of albuterol in the Spiros cassette system in late 
1998 or early 1999, pending FDA approval. There can be no assurance of 
receipt of FDA approval in a timely manner, if at all.

BECLOMETHASONE. Beclomethasone is a steroid used to treat the inflammatory 
component of asthma and certain symptoms of COPD. Systemic side effects 
resulting from the inhalation of beclomethasone are less than those that 
occur with steroids taken in capsule, tablet or liquid form. Beclomethasone 
was first launched in MDI form as Vanceril by Schering-Plough and later as 
Beclovent by Glaxo. In 1997, U.S. sales of beclomethasone were approximately 
$180 million as measured by average wholesale prices. In the first quarter of 
1997, Dura completed dose ranging studies of a one dosage strength of 
beclomethasone in the Spiros cassette system under an IND, and Dura commenced 
a Phase III pivotal 12-week clinical trial to demonstrate safety and efficacy 
in the fourth quarter of 1997. Enrollment of patients is currently scheduled 
to be completed by the second quarter of 1998. Dura plans to submit, on 
behalf of Spiros Corp. II, an NDA for beclomethasone in early 1999.

IPRATROPIUM. Ipratropium is an anticholinergic bronchodilator. Ipratropium is 
most commonly prescribed for the long term management of COPD (including 
chronic bronchitis and emphysema) and for the treatment of asthmatic patients 
who are poorly controlled by, or who experience troublesome side effects 
from, beta-agonists such as albuterol. Ipratropium acts at a site that is 
different from the site where beta-agonists act and thus affords an 
alternative approach to the treatment of airway obstruction. Ipratropium in 
MDI form is marketed as Atrovent by Boehringer Ingelheim. In 1997, U.S. sales 
of ipratropium were approximately $230 million as measured by average 
wholesale prices. Dura has conducted initial preclinical formulation studies 
using ipratropium in order to demonstrate that delivery via Spiros is 
feasible. The Company currently anticipates that ipratropium will be the 
first compound formulated for delivery through the Spiros blisterdisk system. 
Dura, on behalf of Spiros Corp. II, has been in product development for a 
formulation of ipratropium for delivery through Spiros and is preparing an IND 
under which initial dose ranging clinical trials will be conducted. Such 
trials are scheduled to begin in the second half of 1998.

ALBUTEROL-IPRATROPIUM COMBINATION.  Albuterol and ipratropium are frequently 
prescribed in combination for patients with COPD or asthma. Boehringer 
Ingelheim has marketed an albuterol-ipratropium combination product, 
Combivent, outside of the U.S. for a number of years. Combivent was approved 
for marketing in the U.S. in early 1997 and has recently been launched in MDI 
form.

Based on the substantial work performed with albuterol and the feasibility 
study conducted with ipratropium, Spiros Corp. II believes that developing an 
albuterol-ipratropium formulation for delivery using Spiros will be feasible 
and intends to commence the development of this formulation in 1998.

BUDESONIDE. Budesonide is a new generation steroid used to treat the 
inflammatory component of asthma. Budesonide has been marketed in several 
dosage forms outside of the U.S., but to date, has only been available in the 
U.S. in nasal spray form. However, in June 1997, the FDA approved for 
marketing in the U.S. a dry powder formulation of budesonide for delivery 
through Astra's Pulmicort Turbuhaler, which Astra launched in early 1998. In 
1997, worldwide sales of budesonide were estimated to be greater than $600 
million as measured by average wholesale prices. Dura, on behalf of Spiros 
Corp. II, has begun formulation of budesonide for delivery through Spiros.

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<PAGE>

OTHER PRODUCT DEVELOPMENT EFFORTS

The Board of Directors of Spiros Corp. II has the right, with the consent of 
Dura, to select additional designated compounds for the treatment of 
respiratory diseases, including asthma, allergy, cystic fibrosis or 
respiratory infection for delivery using Spiros.

In the event that Spiros Corp. II obtains the rights to any designated 
compounds, Spiros Corp. II will conduct technical evaluations of the 
applicable compounds as candidates for delivery through Spiros. Technical 
evaluations will generally include patent evaluation, establishment of 
analytical methods, micronization of drug substance, preliminary formulation 
development, preliminary aerosol characterization, preliminary stability 
evaluation and animal bioavailability, efficacy and toxicology evaluation. 
Technical evaluations may also include initial safety and efficacy studies in 
humans.

In the event that additional funds become available to Spiros Corp. II, 
whether through the exercise of the Albuterol Option or the Product Option, 
such funds will become part of the Available Funds, and a portion of such 
funds may be used for additional development of a next generation inhaler 
system and certain other enhancements to the existing Spiros technology and 
to fund the acquisition of capital equipment to be used to manufacture the 
Spiros Products.

RELATIONSHIP WITH DURA

The following is a summary of certain provisions of the Stock Purchase 
Option, the Technology Agreement, the Albuterol and Product Option Agreement, 
the Development Agreement, the Manufacturing and Marketing Agreement and the 
Services Agreement. The summary is qualified in its entirety by reference to 
the full text of such agreements, copies of which may be obtained upon 
request to the Company.

STOCK PURCHASE OPTION

Dura, as the holder of all of the issued and outstanding Special Shares will 
have the right, as set forth in Spiros Corp. II's Amended and Restated 
Certificate of Incorporation, to purchase all, but not less than all, of the 
Spiros Corp. II Common Stock outstanding at the time such right is exercised. 
The Purchase Option will be exercisable upon the exercise notice given at any 
time beginning on the closing date of the Offering and ending on the earlier 
of (i) December 31, 2002 or (ii) the 90th day after the date Spiros Corp. II 
provides Dura (as such holder) with certain notice, although following the 
receipt of such notice Dura may, at its election, extend such period by 
providing additional funding for the continued development of Spiros Products 
(but in no event beyond December 31, 2002). If the Purchase Option is 
exercised, the Purchase Option Exercise Price, calculated on a per share 
basis, will be as follows:

<TABLE>
<CAPTION>

If the Spiros Corp. II Common Stock is
Acquired Pursuant to the Purchase Option                         Exercise Price
- -----------------------------------------------------------     ----------------
<S>                                                               <C>

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

                                       9

<PAGE>

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

</TABLE>

The Purchase Option Exercise Price was determined by Dura and Spiros Corp. 
II, giving consideration to the compound annual rate of return, as required 
by potential investors, to be achieved upon any exercise of the Purchase 
Option, the implied returns to investors purchasing securities with a similar 
structure historically and the comparability of the Offering to those prior 
offerings, the value of the Warrants, the nature of Spiros Products, the 
agreements between Dura and Spiros Corp. II, and such other factors as Dura 
and Spiros Corp. II deemed appropriate and advice given by the underwriters 
of the Offering.

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 10 
trading days immediately preceding the date of the exercise notice. In the 
event the Purchase Option were transferred, the payment by the subsequent 
holder of the majority of the Special Shares could be made in cash or, if 
such holder or its parent is a company whose common equity securities are 
listed on a national securities exchange or admitted to unlisted trading 
privileges or listed on the Nasdaq National Market, in the sole discretion of 
such holder, in shares of such listed common equity security.

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 directors of Spiros Corp. II. Under its Amended and 
Restated Certificate of Incorporation, Spiros Corp. II 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, Spiros Corp. II 
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. At 
present, Dura has indicated it has no intention of transferring such Special 
Shares.

TECHNOLOGY LICENSE AGREEMENT

Dura and Spiros Corp. II entered into a Technology License Agreement (the 
"Technology Agreement"), under which Dura granted Spiros Corp. II an 
exclusive, worldwide, perpetual, royalty-bearing license to use the core 
Spiros technology in research, development and commercialization (except with 
respect to beclomethasone in Asia) of the Spiros Products, including rights 
to patents, patent applications and other intellectual property rights.

In consideration for these license rights granted to Spiros Corp. II by Dura, 
Spiros Corp. II will pay Dura a technology access fee equal to the greater of 
(a) 5% of the Net Sales of each Spiros Product or (b) $2 million for all 
Spiros Products in any calendar year beginning in 1998. Spiros Corp. II's 
obligation will terminate, on a country-by-country basis, (a) within 10 years 
from the first sale of such Spiros Product in those countries where no 
patents covering such product are issued and (b) in those countries where 
patents covering the Spiros Products are issued, upon the expiration of the 
last-to-expire patent covering such Spiros Product in such country.

In addition, Spiros Corp. II granted Dura (a) a worldwide, exclusive, 
royalty-free license to use the core technology and the program technology to 
develop the Spiros Products pursuant to the terms of the Development 
Agreement, (b) a worldwide, exclusive, royalty-bearing license to use the 
program technology to sell Spiros Products worldwide pursuant to the terms of 
the Manufacturing and Marketing Agreement, (c) upon Dura's exercise of the 
Albuterol Option, a worldwide, exclusive, royalty-free, irrevocable, 
perpetual license to the program technology to develop, manufacture and 
commercialize the Albuterol Product, (d) upon Dura's exercise of the Product 
Option, a worldwide, exclusive, royalty-free, irrevocable, perpetual license 
to the program technology to develop, manufacture and commercialize sell the 
Spiros Product for which the Product Option is exercised, and (e) a 
worldwide, exclusive, royalty-free, irrevocable, perpetual license to the 
program technology, including technology relating to enhancements to the 
existing Spiros technology or any next generation inhaler system, to develop, 

                                      10
<PAGE>

manufacture and commercialize products other than the Spiros Products, 
including products that compete with the Spiros Products.

Under the Technology Agreement, Dura must use commercially reasonable efforts 
to secure the rights of third parties in technology that is necessary or 
useful to the development of the Spiros Products. Spiros Corp. II has no 
obligation to accept any grant of such rights or to assume any obligation 
without its prior written consent. If Spiros Corp. II desires to obtain any 
such rights, Dura and Spiros Corp. II agree to negotiate in good faith 
regarding the allocation of any royalty, license fee or other payments 
payable to the third party and the assumption of any obligations applicable 
to such license.

Until the expiration of the Purchase Option, Dura will direct and cause, at 
Spiros Corp. II's expense, appropriate patent applications to be prepared, 
prosecuted and maintained with respect to patents licensed to Spiros Corp. II 
and with respect to any technology developed or acquired on behalf of Spiros 
Corp. II by Dura. Upon the termination of the unexercised Purchase Option, 
all patents and patent applications developed or acquired on behalf of Spiros 
Corp. II will be assigned to Spiros Corp. II.

Pursuant to the terms of the Technology Agreement, if Spiros Corp. II or Dura 
receives notice of alleged infringement of any patent, it must notify the 
other party of such infringement and all recoveries in any action to enforce 
patent rights shall be retained by the parties in proportion to the 
respective portion of expenses borne by the parties in enforcing such action.

Spiros Corp. II agreed to indemnify Dura against certain third party claims, 
including patent infringement claims, relating to the Spiros Corp. II's use 
of the program technology or breach of the Technology Agreement, Development 
Agreement or Manufacturing and Marketing Agreement. Dura agreed to indemnify 
Spiros Corp. II against certain third party claims, including patent 
infringement claims, relating to Dura's use of the program technology, 
performance of development or breach of the Technology Agreement, Development 
Agreement or Manufacturing and Marketing Agreement.

Prior to the expiration of the Purchase Option, Spiros Corp. II cannot 
without Dura's prior written consent (a) license, sublicense, encumber or 
otherwise transfer any rights in the program technology; (b) make, use or 
sell any of the program technology; or (c) authorize, cause or assist in any 
way any other person to do any of the foregoing. Following the expiration or 
termination of the Purchase Option, the foregoing limitations will cease to 
be applicable and Spiros Corp. II will have the right to license, sublicense, 
encumber or otherwise transfer the program technology for use with any Spiros 
Products that have not been acquired by Dura through the exercise of either 
the Albuterol Option or the Product Option. Dura may assign its rights and 
delegate its obligations under the Technology Agreement only to an affiliate 
of Dura, certain successors of Dura or certain persons that acquired 
substantially all of the assets of Dura.

The Technology Agreement will remain in full force and effect indefinitely, 
unless terminated by (a) mutual agreement of the parties or (b) Dura's 
exercise of the Purchase Option.

Either Dura or Spiros Corp. II may terminate the Technology Agreement prior 
to its expiration if the other party (a) breaches any material obligation 
under the Technology Agreement or the Development Agreement, which breach 
continues for a period of 60 days after written notice thereof, (b) enters 
into any voluntary proceeding in bankruptcy, reorganization or an arrangement 
for the benefit of its creditors, or its Board of Directors or stockholders 
authorize such action or (c) fails to dismiss any such proceeding within 60 
days after the same is involuntarily commenced. If Spiros Corp. II terminates 
the Technology Agreement, Spiros Corp. II's license to use the program 
technology will continue (except with respect to any Spiros Products that 
have been previously acquired by Dura through exercise of the Albuterol 
Option or the Product Option), and Spiros Corp. II will be free to enter into 
arrangements with third parties to research, develop and commercialize the 
Spiros Products. If Dura terminates the Technology Agreement, (a) Spiros 
Corp. II's license to use the core Spiros technology under the Technology 
Agreement will terminate, (b) all of Spiros Corp. II's rights to the program 
technology will revert to Dura, and (c) all rights to develop, use and sell 
the Spiros Products will revert to Dura. Dura and Spiros Corp. II will use 
reasonable efforts for a period of 120 days after the Technology Agreement is 
terminated by Dura to reach

                                      11
<PAGE>

agreement on royalties and other compensation to be paid by Dura to Spiros 
Corp. II solely with respect to the Spiros Products and the program 
technology and, in the absence of such agreement, the matter will be 
submitted to binding arbitration. There can be no assurance that, upon 
termination of the Technology Agreement by Spiros Corp. II, it will be able 
to make alternative arrangements for the research, development and 
commercialization of some or all of the Spiros Products.

ALBUTEROL AND PRODUCT OPTION AGREEMENT

Dura and Spiros Corp. II entered into the Albuterol and Product Option 
Agreement pursuant to which Dura will obtain (a) the assets related to the 
Albuterol Spiros Product (the "Albuterol Program Assets") and (b) the assets 
related to the Product Option Spiros Product (the "Spiros Product Program 
Assets").

The Albuterol Program Assets include (a) the Albuterol Product, (b) albuterol 
as formulated for use in the Albuterol Product, (c) a perpetual, 
sublicensable, non-exclusive, royalty-free license to the technology owned by 
Dura or developed or acquired by Dura during the term of the Development 
Agreement applicable to the Albuterol Product for use solely with the 
Albuterol Product, and (d) all applications and documents filed with the FDA 
or a foreign regulatory authority to obtain regulatory approval to commence 
commercial sale or use of the Albuterol Product. The Albuterol Option is 
exercisable commencing on the date of the closing of the Offerings and ending 
on the earlier of (i) 360 days after receipt of FDA approval to market the 
Albuterol Product or (ii) the date Dura ceases to manufacture or market the 
Albuterol Product in accordance with the terms of the Manufacturing and 
Marketing Agreement.

Upon exercise of the Albuterol Option, Dura will make a single payment to 
Spiros Corp. II in cash equal to (a) the aggregate Purchase Option Exercise 
Price, assuming acquisition of all shares of Spiros Corp. II Common Stock 
issued pursuant to the Offerings four years following closing of the 
Offerings, multiplied by (b) a fraction, the numerator of which will equal 
the development and commercialization costs and expenses incurred by Spiros 
Corp. II in connection with the development and commercialization of the 
Albuterol Product and the denominator of which will equal the Available Funds 
(excluding the Proceeds, if any, from the exercise of the Albuterol Option or 
the Product Option).

The Spiros Product Program Assets include (a) the Option Product, (b) the 
compound to be delivered by the Option Product, as formulated for use 
specifically in the Option Product, (c) a perpetual, sublicensable, 
non-exclusive, royalty-free license to the technology owned by Dura or 
developed or acquired by Dura during the term of the Development Agreement 
applicable to the Option Product for use solely with the Option Product, and 
(d) all applications and documents filed with the FDA or a foreign regulatory 
authority to obtain regulatory approval to commence commercial sale or use of 
the Option Product. The Product Option is exercisable with respect to each 
Spiros Product commencing on the date of the closing of the Offerings and 
ending 90 days after receipt of FDA approval to market such Spiros Product; 
provided, however, that the Product Option may only be exercised with respect 
to a single Spiros Product.

Upon exercise of the Product Option, Dura will make a single payment to 
Spiros Corp. II in cash equal to 110% of (a) the aggregate Purchase Option 
Exercise Price, assuming acquisition of all shares of Spiros Corp. II Common 
Stock issued pursuant to the Offering four years following the closing of the 
Offering in December 2001, multiplied by (b) a fraction, the numerator of 
which will equal the development and commercialization costs and expenses 
incurred by Spiros Corp. II in connection with the development of the Option 
Product and the denominator of which will equal the Available Funds 
(excluding the proceeds, if any, from the exercise of the Albuterol Option or 
the Product Option).

Any payments received by Spiros Corp. II with respect to the exercise of the 
Albuterol Option and the Product Option will become part of the Available 
Funds.

The Albuterol and Product Option Agreement will automatically terminate in 
the event that Spiros Corp. II terminates the Technology Agreement, the 
Development Agreement or the Manufacturing and Marketing

                                      12
<PAGE>

Agreement, consistent with the terms of those agreements. Additionally, the 
Albuterol and Product Option Agreement will terminate on the date the 
Purchase Option terminates, whether by exercise or otherwise.

DEVELOPMENT AGREEMENT

Dura and Spiros Corp. II entered into the Development Agreement under which 
Dura agreed to use commercially reasonable efforts to develop the program 
technology for the purpose of the development of the Spiros Products and to 
make certain other expenditures. Dura will furnish all labor, supervision, 
services, supplies, and materials necessary to perform the development.

Dura also agreed to use commercially reasonable efforts to obtain the rights 
to, and to sublicense to Spiros Corp. II, any patent or technology license 
held by a third party that Dura reasonably determines to be necessary or 
useful to enable Dura to conduct the development. Dura will act as Spiros 
Corp. II's exclusive agent for the filing and prosecuting of all regulatory 
applications and permits required to obtain FDA approval in Dura's name and 
any other necessary regulatory approvals for the Spiros Products. In the 
event that the Purchase Option expires unexercised, Dura will use its 
reasonable efforts to cause all applications and documents filed with the FDA 
or a foreign regulatory authority to obtain regulatory approvals for the 
Spiros Products, with respect to which Dura has not acquired exclusive 
rights, to be assigned to Spiros Corp. II.

Dura will conduct the development in accordance with an annual workplan and 
budget. At the closing of the Offering, Dura provided Spiros Corp. II with a 
workplan and budget covering December 1997 through December 31, 1998. 
Thereafter, Dura and Spiros Corp. II will prepare annual workplans and 
budgets. The annual workplans and budgets are subject to approval and 
acceptance by Spiros Corp. II's Board of Directors. Dura must report any 
significant deviations from an annual workplan and budget in a timely manner. 
Further, reimbursement for expenditures from Spiros Corp. II may not exceed 
in any calendar year 120% of the amount allocated in the applicable annual 
workplan and budget, unless otherwise approved by Spiros Corp. II.

During the term of the Development Agreement, each of Dura and Spiros Corp. 
II will provide the other with quarterly reports with respect to all payments 
due and all credits taken for such quarter, including, in the case of Dura, a 
statement of the Development Costs (defined below) incurred during such 
quarter and a summary of work performed for Spiros Corp. II. Additionally, 
each of Spiros Corp. II and Dura is required to maintain and make available 
for inspection by an independent public accountant selected by the requesting 
party, once in each calendar year and upon reasonable notice and during 
regular business hours, such records of the other party as may be necessary 
to verify the accuracy of reports and payments made in respect of the 
Development Agreement.

Payments to Dura under the Development Agreement for Dura's work in 
performing the development will be made for the full amount of all of Dura's 
research and development expenses, general and administrative expenses, 
capital equipment costs and all other costs and expenses (the "Development 
Costs") incurred by Dura in performing the activities described above, up to 
the maximum amount of the funds available to Spiros Corp. II, which include 
substantially all of the Available Funds. Development Costs will include 
development expenses (including salaries, benefits, supplies, and facilities 
and overhead allocations) that are billed at a rate of fully burdened cost 
plus 25%; provided, however, that services provided by third parties will be 
billed at a rate of cost plus 20%. This pricing structure is considered by 
Dura to be consistent with contractual relationships it has had with other 
third parties. Development Costs also include costs for development conducted 
by Dura from October 10, 1997 through the date of the closing of the Offering.

If Spiros Corp. II or Dura determines that the development of a particular 
Spiros Product should be discontinued because continued development is not 
feasible or is uneconomic, or that the development should be expanded to 
include one or more Designated Compounds, then Spiros Corp. II and Dura will 
use reasonable efforts to agree on the nature of the development and the 
identity of any other compound on which unexpended Available Funds will be 
spent.

Under the Development Agreement, the manufacture and sale of Spiros Products 
for the sole purpose of conducting clinical trials necessary to obtain FDA 
approval or any other required regulatory approval will be charged to Spiros

                                      13
<PAGE>

Corp. II as Development Costs. Dura will remit to Spiros Corp. II any revenue 
received by it from the sale of such Spiros Products prior to receipt of FDA 
approval to market.

Either Dura or Spiros Corp. II may terminate the Development Agreement prior 
to its expiration if the other party (a) breaches any material obligation 
under the Technology Agreement or the Development Agreement, which breach 
continues for a period of 60 days after written notice thereof, (b) enters 
into any voluntary proceeding in bankruptcy, reorganization or an arrangement 
for the benefit of its creditors, or its Board of Directors or stockholders 
authorize such action or (c) fails to dismiss any such proceeding within 60 
days after the same is involuntarily commenced.

Dura's obligation to perform development work under the Development Agreement 
will terminate at such time as Spiros Corp. II has cash or cash equivalents 
of less than $5 million, which is projected by Spiros Corp. II to occur on or 
about February 28, 2001. Upon receipt of notice from Spiros Corp. II, Dura 
may elect to provide additional funding for the development of the Spiros 
Products.

Dura may assign its rights and delegate its obligations under the Development 
Agreement only to an affiliate of Dura, certain successors of Dura or certain 
persons that acquired substantially all of the assets of Dura. Spiros Corp. 
II may not assign its rights or delegate its obligations under the 
Development Agreement.

MANUFACTURING AND MARKETING AGREEMENT

Dura and Spiros Corp. II entered into the Manufacturing and Marketing 
Agreement under which Spiros Corp. II granted to Dura an exclusive, worldwide 
license to manufacture and market the Spiros Products. Dura will pay Spiros 
Corp. II on a quarterly basis a royalty of 7% of the Net Sales of each Spiros 
Product beginning upon receipt of FDA approval to market such product; 
provided, however, that prior to the expiration of the Albuterol Option, no 
royalty payment will be made with respect to Net Sales of the Albuterol 
Product.

Under the Manufacturing and Marketing Agreement, Dura will agree to use 
diligent efforts to commence sales of each Spiros Product promptly upon 
receiving FDA approval for such product. Dura will be responsible for 
maintaining competent, qualified sales personnel, and will agree not to make 
any representations inconsistent with the approved labeling of each Spiros 
Product.

"Net Sales" for purposes of the Manufacturing and Marketing Agreement and the 
Technology Agreement will be defined as the gross amount invoiced for sales 
of the Spiros Products by Dura or its sublicensees, if any, to third parties 
less (i) discounts actually allowed, (ii) credits for claims, allowances, 
retroactive price reductions or returned Spiros Products, (iii) prepaid 
freight charges incurred in transporting Spiros Products to customers, (iv) 
sales taxes and other governmental charges actually paid in connection with 
the sales (but excluding what is commonly known as income taxes) and (v) any 
royalty obligations under a certain royalty agreement under which Dura is 
obligated to pay royalties to the inventor of certain aspects of the Spiros 
technology. Net Sales will not include sales between or among Dura, its 
affiliates and its sublicensees unless such sales are for end use rather than 
for purposes of resale.

The Manufacturing and Marketing Agreement will terminate (a) upon the 
exercise or termination of the Purchase Option or (b) by mutual agreement of 
the parties at any time. In the event Dura exercises the Albuterol Option or 
the Product Option, the Manufacturing and Marketing Agreement will terminate 
with respect to the Albuterol Product or the Option Product, as the case may 
be, but will otherwise continue in full force and effect.

SERVICES AGREEMENT

Spiros Corp. II entered into the Services Agreement with Dura under which 
Dura will provide certain management and administrative services to Spiros 
Corp. II at the rate of $100,000 per calendar quarter for services to be 
performed internally by Dura and for services performed by third parties for 
Dura on Spiros Corp. II's behalf. In addition, Spiros Corp. II will reimburse 
Dura for all costs and expenses incurred by Dura in connection with the 
Offering. The Services Agreement terminates on the earlier of (i) the 
exercise of the Purchase Option or (ii) 12 months after expiration of the 
Purchase Option.

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<PAGE>

SPECIAL COMMON STOCK

There are currently issued 1,000 shares of Spiros Corp. II special common 
stock (the "Special Shares"), all of which are held by Dura. The Special 
Shares do not confer on the holders thereof the right to vote at any meeting 
of Spiros Corp. II stockholders except as required by law or referred to in 
the next paragraph and except that holders of a majority of Special Shares 
are entitled to elect two directors. Nor do these shares have the right to 
any profits of Spiros Corp. II. In the event of the winding up of Spiros 
Corp. II, the Spiros Corp. II Common Stock shall have a priority over the 
Special Shares with respect to return of capital, and the Special Shares 
shall not otherwise be entitled to participate in any way in the profits or 
assets of Spiros Corp. II. Spiros Corp. II does not presently intend to issue 
any additional Special Shares.

Until the expiration of the Purchase Option, no resolution or act of the 
Company to authorize or permit any of the following will be effective without 
the prior written approval of the holders of a majority of the outstanding 
Special Shares: (i) the allotment or issue of shares or other securities of 
the Company or the creation of any right to such an allotment or issue; (ii) 
the reduction of the Company's authorized capital stock; (iii) the alteration 
of or any change to the rights, powers, preferences and restrictions of the 
Special Shares; (iv) outstanding borrowings of an aggregate of more than $1 
million at any one time; (v) the sale or other disposition of or the creation 
of any lien or liens on the whole or a material part of the Company's 
business or assets; (vi) the declaration or payment of dividends or the 
making of any other distributions to the Company's shareholders; (vii) the 
merger, consolidation or reorganization of the Company with or into any other 
corporation; (viii) the sale, liquidation or other disposition of all or 
substantially all of the assets of the Company; (ix) the alteration or 
amendment of Articles IV or VII of the Company's Amended and Restated 
Certificate of Incorporation; and (x) the adoption, amendment or repeal of 
the Bylaws of the Company.

Thus Dura, as the holder of a majority of the outstanding Special Shares, 
could preclude the holders of a majority of the shares of Spiros Corp. II 
Common Stock and the Board of Directors of Spiros Corp. II from taking any of 
the foregoing actions during such period. Dura, as holder of all of the 
outstanding Special Shares, may transfer or sell all, but not less than all, 
of such shares. As a result, an unrelated third party may acquire rights 
associated with the Special Shares, including the rights discussed in this 
section. In addition, there can be no assurance that any transferee of the 
Special Shares will have the same financial resources or development, 
manufacturing or marketing capabilities as Dura, which may have a material 
adverse effect on the likelihood of the exercise of the Albuterol Option, the 
Product Option or the Purchase Option. In addition, any resolution to wind up 
the affairs of or liquidate Spiros Corp. II will confer upon the holders of 
the Special Shares a right to vote and such Special Shares will carry a 
number of votes equal to the total number of votes carried by the Spiros 
Corp. II Common Stock at the time outstanding.

SALES AND MARKETING

Spiros Corp. II will rely entirely on Dura under the Manufacturing and 
Marketing Agreement for its sales and marketing efforts. Under the 
Manufacturing and Marketing Agreement, Dura will submit an annual marketing 
plan to be approved by Spiros Corp. II.

COMPETITION

There are at least 10 companies currently involved in the development, 
marketing or sales of dry powder pulmonary drug delivery systems. There are 
two types of DPIs currently in commercial use worldwide, individual dose and 
multiple dose. Individual dose DPIs currently marketed in the U.S. include 
the Rotohaler-TM- (developed and marketed by Glaxo) and the 
Spinhaler-Registered Trademark- (developed and marketed by Fisons Limited). 
The Turbuhaler-Registered Trademark- (developed and marketed by Astra), a 
multiple dose DPI, is the leading DPI in worldwide sales. In June 1997, the 
FDA approved the first Turbuhaler product, the Pulmicort Turbuhaler, for 
marketing in the U.S., which Astra launched in early 1998. Recently the FDA 
also approved two multiple dose DPIs developed by Glaxo.

                                      15
<PAGE>

Many of these companies, including large pharmaceutical firms with financial 
and marketing resources and development capabilities substantially greater 
than those of Spiros Corp. II, are engaged in developing, marketing and 
selling products that compete with the proposed products of Spiros Corp. II. 
In addition, Dura may develop or acquire products which may compete with 
Spiros Products. Further, other products now in use or under development by 
others may be more effective than Spiros Corp. II's current or future 
products. The industry is characterized by rapid technological change, and 
competitors may develop their products more rapidly than Spiros Corp. II. 
Competitors may also be able to complete the regulatory process sooner, and 
therefore, may begin to market their products in advance of Spiros Corp. II's 
products. The Company believes that competition among both prescription 
pharmaceuticals and pulmonary delivery systems will be based on, among other 
things, product efficacy, safety, reliability, availability and price.

MANUFACTURING

A substantial amount of the work under the Development Agreement and the 
Manufacturing and Marketing Agreement will be conducted at Dura's facilities. 
Dura has informed Spiros Corp. II of its belief that its available facilities 
are sufficient to satisfy its obligations for performance under the 
Development Agreement and the Manufacturing and Marketing Agreement. However, 
the same facilities may be used by Dura for work performed on its own account 
and in the performance of third party contracts.

PATENTS AND PROPRIETARY RIGHTS

Dura presently holds five U.S. patents and four U.S. patent applications 
relating to the Spiros technology to be further developed by Spiros Corp. II. 
The issued patents include a patent with claims covering the use in Spiros of 
an impeller to create an aerosol cloud of a drug intended for inhalation, 
which expires in 2011. Dura has also filed certain continuations in part and 
foreign patent applications relating to Spiros. All of the above patents and 
patent applications, relating to the Spiros technology, together with their 
respective continuations in part and foreign patent applications, have been 
licensed to Spiros Corp. II pursuant to the Technology License Agreement. 
Until the expiration or termination of the Purchase Option, Dura is required 
to file patent applications, at Spiros Corp. II's expense, with respect to 
inventions included in the program technology. Dura will be the owner and 
Spiros Corp. II will be the exclusive licensee for use with the Spiros 
Products of any patents included in the program technology. Spiros Corp. II's 
success will therefore depend in part upon the ability of Dura or Spiros 
Corp. II, as the case may be, to obtain strong patent protection both in the 
United States and other countries.

Spiros Corp. II considers the protection of discoveries in connection with its 
development activities important to its businesses. Spiros Corp. II intends 
to seek patent protection in the U.S. and selected foreign countries where 
deemed appropriate. There can be no assurance that issued patents or 
subsequent patents, if issued, will adequately protect Spiros Corp. II or 
that such patents will provide protection against infringement claims by 
competitors. Dura has also filed certain foreign patent applications relating 
to Spiros technology. There can be no assurance that additional patents, U.S. 
or foreign, will be obtained covering the Spiros Products or that, if issued 
or licensed, the patents covering such products will provide substantial 
protection or be of commercial benefit. Federal court decisions establishing 
legal standards for determining the validity and scope of patents in the 
field are in transition. There can be no assurance that the historical legal 
standards surrounding questions of validity and scope will continue to be 
applied or that current defenses as to issued patents in the field will offer 
protection in the future.

Spiros Corp. II also relies upon trade secrets, unpatented proprietary 
know-how and continuing technological innovation to develop its competitive 
position. There can be no assurance, however, that others may not acquire or 
independently develop similar technology or, if patents are not issued with 
respect to products arising from research, that Spiros Corp. II will be able 
to maintain information pertinent to such research as proprietary technology 
or trade secrets.

GOVERNMENT REGULATION

The manufacturing and marketing of Spiros Products are subject to regulation 
by Federal and state government authorities, including the FDA, the 
Environmental Protection Agency and the Occupational Safety and Health

                                      16
<PAGE>

Administration, in the U.S. and other countries. In the U.S., pharmaceuticals 
and drug delivery systems, including Spiros, are also subject to rigorous FDA 
regulation and may be subject to regulation by other jurisdictions, including 
the State of California. The Federal Food, Drug, and Cosmetic Act and the 
Public Health Service Act govern the testing, manufacture, safety, efficacy, 
labeling, storage, record keeping, approval, advertising and promotion of 
Spiros Products. Product development and approval within this regulatory 
framework takes a number of years and involves the expenditure of substantial 
resources.

To obtain FDA approval for each of the Spiros Products, Dura, on behalf of 
Spiros Corp. II, is required to conduct each of the following steps and 
possibly others: (i) preclinical testing (laboratory and possibly animal 
tests), (ii) the submission to the FDA of an IND application, which must 
become effective before human clinical trials may commence, (iii) adequate 
and well-controlled human clinical trials to establish safety and efficacy, 
(iv) the submission of an NDA to the FDA for marketing approval, and (v) FDA 
approval of the NDA prior to any commercial sale or shipment. The NDA must 
include, in addition to a compilation of preclinical and clinical data, 
complete information about product performance and manufacturing facilities 
and processes. Prior to completion of the NDA review process, the FDA may 
conduct an inspection of the facility, manufacturing procedures, operating 
systems and personnel qualifications. In addition to obtaining FDA approval 
for each product, each domestic drug and/or device manufacturing facility 
must be registered with and approved by the FDA. Domestic manufacturing 
facilities are subject to biennial inspections by the FDA and inspections by 
other jurisdictions and must comply with Good Manufacturing Practice 
("cGMPs") for both drugs and devices. To supply products for use in the U.S., 
foreign manufacturing establishments must comply with cGMP and other 
requirements and are subject to periodic inspection by the FDA or by 
regulatory authorities in such countries under reciprocal agreements with the 
FDA.

Preclinical testing includes laboratory evaluation of product chemistry and 
animal studies, if appropriate, to assess the safety and efficacy of the 
product and its formulation. The results of the preclinical tests are 
submitted to the FDA as part of an IND application, and unless the FDA 
objects, the IND application will become effective 30 days following its 
receipt by the FDA, thus allowing the product to be tested in humans.

Clinical trials involve the administration of the pharmaceutical product to 
healthy volunteers or to patients identified as having the condition for 
which the pharmaceutical agent is being tested. The pharmaceutical product is 
administered under the supervision of a qualified principal investigator. 
Clinical trials are conducted in accordance with Good Clinical Practice and 
protocols previously submitted to the FDA (as part of the IND application) 
that detail the objectives of the study, the parameters used to monitor 
safety and the efficacy criteria evaluated. Each clinical study is conducted 
under the auspices of an independent Institutional Review Board ("IRB") at 
the institution at which the study is conducted. The IRB considers, among 
other things, the design of the study, ethical factors, the safety of the 
human subjects and the possible liability risk for the institution.

Clinical trials for new products are typically conducted in three sequential 
phases that may overlap. In Phase I, the initial introduction of the 
pharmaceutical into healthy human volunteers, the emphasis is on testing for 
safety (adverse effects), dosage tolerance, metabolism, distribution, 
excretion and clinical pharmacology. Phase II involves studies in a limited 
patient population to determine the initial efficacy of the pharmaceutical 
for specific targeted indications, to determine dosage tolerance and optimal 
dosage and to identify possible adverse side effect and safety risks. Once a 
compound is found to be effective and to have an acceptable safety profile in 
Phase II evaluations, Phase III trials are undertaken to more fully evaluate 
clinical outcomes. The FDA reviews both the clinical plans and the results of 
the trials and may require the study to be discontinued at any time if there 
are significant safety issues.

The results of the preclinical and clinical trials for pharmaceutical drug 
products such as those being developed by Dura, on behalf of Spiros Corp. II, 
are submitted to the FDA in the form of an NDA for marketing approval. FDA 
approval can take several months to several years, or approval may be denied. 
The approval process can be affected by a number of factors, including the 
severity of the side effects, the availability of alternative treatments and 
the risks and benefits demonstrated in clinical trials. Additional animal 
studies or clinical trials may be requested during the FDA review process and 
may delay marketing approval. After FDA approval for the initial indication, 
further clinical trials are necessary to gain approval for the use of the 
product for any additional indications. The FDA may also require 
post-marketing testing and surveillance to monitor for adverse effects, which 
can involve significant additional expense.

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<PAGE>

Although the FDA has considerable discretion to decide what requirements must 
be met prior to approval, the Company believes, based upon the FDA's 
historical practice with respect to drug inhalers, that the FDA is likely to 
regulate each combination of Spiros with a compound as a discrete 
pharmaceutical or drug product requiring separate approval as a new drug. The 
Company believes that the approval process for each drug/delivery combination 
now under development may be shorter than the full NDA process described 
above because the safety and efficacy of the compounds have already been 
established in currently marketed formulations and delivery mechanisms.

Since completion of the pivotal trials, a number of modifications have been 
made to the Spiros system, some of which address problems encountered with 
the mechanical features of the Spiros delivery system during the pivotal 
trials. These changes are intended to improve the reliability, performance, 
manufacturability, and customer acceptance of the mechanical features of the 
Spiros delivery system. The Company expects that it will be required to 
complete testing and validation pursuant to cGMP requirements of the Spiros 
system as modified for commercial distribution, which could be costly and 
time-consuming. There can be no assurance that the FDA will not require the 
Company to undertake further laboratory testing, field testing and/or 
clinical studies in order to insure the safety and effectiveness of the 
albuterol product intended to be commercialized by the Company and to insure 
that it can be reliably manufactured. If a proposed change is deemed to be a 
major modification by the FDA, the Company could be required to repeat one or 
more of the clinical studies. Moreover, because of the time necessary to 
validate the changes to the Spiros system, there can be no assurance that 
Dura will be prepared for any FDA preapproval inspection of Dura's Spiros 
manufacturing facilities in a timely manner. If the Company is required to 
undertake additional laboratory testing and/or clinical studies or to 
postpone the preapproval inspection, or if the Company fails to complete the 
open label study in a timely manner, the Company could receive a 
non-approvable letter and, in any event, there could be a substantial delay 
in completion of the approval process.

In April 1996, the export provisions of the Federal Food, Drug, and Cosmetic 
Act were relaxed to permit the export of unapproved drugs to a foreign 
country, provided the product complies with the laws of that country and has 
valid marketing authorization in at least one of a list of designated "Tier 
1" countries. Once a product is exported to a qualified foreign country, the 
Company will be subject to the applicable foreign regulatory requirements 
governing human clinical trials and marketing approval in that country. The 
requirements relating to the conduct of clinical trials, product licensing, 
pricing and reimbursement vary widely from country to country and there can 
be no assurance that the Company will be able to meet and fulfill the 
statutory requirements in a particular country.

RESEARCH AND DEVELOPMENT EXPENSES

Spiros Corp. II incurred research and development expenses of approximately 
$7,040,000 for the period from September 23, 1997 (date of incorporation) 
through December 31, 1997.

HUMAN RESOURCES

The Company has no employees.  The officers, Dr. David S. Kabakoff, Chairman, 
President and Chief Executive Officer, Erle T. Mast, Vice President and Chief 
Financial Officer, and Mitchell R. Woodbury, Secretary, are employees of Dura.

RISKS AND UNCERTAINTIES

DEVELOPMENT RISKS ASSOCIATED WITH SPIROS. Spiros will require significant 
additional development. There can be no assurance that development of Spiros 
will be completed successfully, that Spiros will not encounter problems in 
clinical trials that will cause the delay or suspension of such trials, that 
current or future testing will show Spiros to be safe or efficacious or that 
Spiros will receive regulatory approval. In addition, regulatory approvals 
will have to be obtained for each drug to be delivered through the use of 
Spiros prior to commercialization. Moreover, even if Spiros does receive 
regulatory approval, there can be no assurance that Spiros will be 
commercially successful, have all of the patent and other protections 
necessary to prevent competitors from producing similar products and not 
infringe on patent or other proprietary rights of third parties. The failure 
of Spiros to receive timely regulatory approval and achieve commercial 
success would have a material adverse effect on the Company.

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<PAGE>

GOVERNMENT REGULATION; NO ASSURANCE OF FDA APPROVAL. Development, testing, 
manufacturing and marketing of pharmaceutical products including drug 
delivery systems are subject to extensive regulation by numerous governmental 
authorities in the U.S. and other countries. The process of obtaining FDA 
approval of pharmaceutical products and drug delivery systems is costly and 
time consuming. Any new pharmaceutical product must undergo rigorous 
preclinical and clinical testing and an extensive regulatory approval process 
mandated by the FDA. Such regulatory review includes the determination of 
manufacturing capability and product performance. Marketing of drug delivery 
systems also requires FDA approval, which can be costly and time consuming to 
obtain. A separate regulatory approval will need to be obtained for each 
Spiros drug delivery system.

Dura, on the Company's behalf, has submitted an abbreviated NDA called a 
505(b)(2) application for the use of albuterol with the Spiros system. Dura, 
on the Company's behalf, expects to submit an abbreviated NDA for the use of 
other drugs with the Spiros system. No assurances can be given that all of 
Dura's drugs identified for development with Spiros will be suitable for, or 
approved under, abbreviated application procedures. Certain abbreviated 
application procedures have been the subject of petitions filed by brand name 
manufacturers which seek changes in the FDA's approval process for such 
abbreviated applications. These requested changes include, among other 
things, disallowance of the use by an applicant of an abbreviated application 
with data considered proprietary by the original manufacturer that was 
submitted to the FDA as part of an original NDA. The Company or Dura is 
unable to predict at this time whether the FDA will make any changes to its 
abbreviated application procedures as a result of such petitions or the 
effect that such changes or challenges may have on Dura.

There can be no assurance that the pharmaceutical products currently in 
development by the Company will be approved by the FDA. In addition, there 
can be no assurance that all necessary approvals will be granted for future 
products or that FDA review or actions will not involve delays caused by the 
FDA's request for additional information or testing that could adversely 
affect the time to market and sale of the products. For future products of 
the Company, failure to comply with applicable regulatory requirements can, 
among other things, result in the suspension of regulatory approval, as well 
as possible civil and criminal sanctions.

NO MANUFACTURING OR MARKETING CAPABILITY. Spiros Corp. II has no 
manufacturing or marketing capability. Spiros Corp. II is obligated to only 
utilize Dura's manufacturing facilities for manufacturing in the U.S. during 
the term of the Manufacturing and Marketing Agreement. Dura has the right 
under the Manufacturing and Marketing Agreement to use contract manufacturers 
and currently plans to rely on third parties to manufacture certain 
components of Spiros. There can be no assurance that Dura's facilities or 
those of its contract manufacturers will be satisfactory for the needs of 
Spiros Corp. II. In addition, Dura or its contract manufacturers, as the case 
may be, may require additional FDA approval prior to commencing manufacturing 
of Spiros Products. There can be no assurance that the Spiros Products can be 
manufactured, whether by Dura or a contract manufacturer, on a commercial 
scale for commercially reasonable cost or on a timely basis. In addition, 
Spiros Corp. II has no experience in sales, marketing or distribution. Under 
the Manufacturing and Marketing Agreement, Dura has been granted exclusive 
worldwide marketing rights to the Spiros Products. There can be no assurance 
that Dura's sales and marketing force will be able to establish commercially 
successful sales and distribution capabilities for the Spiros Products.

ABSENCE OF OPERATING HISTORY; NO ASSURANCE OF PROFITABILITY; LACK OF 
DIVIDENDS. Spiros Corp. II was recently formed and has no operating history 
upon which investors may base an evaluation of its likely financial 
performance. Spiros Corp. II anticipates that substantially all of its 
available funds may be expended prior to the earliest receipt of any 
significant revenues by Spiros Corp. II, resulting in significant losses. 
Further, even if the Spiros Products are developed in accordance with the 
Development Agreement and marketed pursuant to the Manufacturing and 
Marketing Agreement, there can be no assurance that they can be marketed 
profitably. Even if such Spiros Products are commercialized profitably, the 
initial losses incurred by Spiros Corp. II may never be recovered. Spiros 
Corp. II is prevented from paying dividends on the Spiros Corp. II Common 
Stock without the approval of Dura, and accordingly, does not expect to pay 
any dividends.

COMPETITION. Many companies, including large pharmaceutical firms with 
financial and marketing resources and development capabilities substantially 
greater than those of Spiros Corp. II, are engaged in developing, marketing 
and selling products that compete with those planned to be offered. The 
selling prices of such products typically decline as competition increases. 
Furthermore, other products now in use or under development by others may be 
more effective than the Company's future products. The industry is 
characterized by rapid technological change, and competitors may

                                      19
<PAGE>

develop their products more rapidly than the Company. Competitors may also be 
able to complete the regulatory process sooner, and therefore, may begin to 
market their products in advance of the Company's products. The Company 
believes that competition among pulmonary drug delivery systems aimed at the 
asthma and COPD markets will be based on, among other things, product 
efficacy, safety, reliability, availability and price.

There are at least 10 companies currently involved in the development, 
marketing or sales of dry powder pulmonary drug delivery systems. There are 
two types of DPIs currently in commercial use worldwide, individual dose and 
multiple dose. Individual dose DPIs currently marketed in the U.S. include 
the Rotohaler-TM- (developed and marketed by Glaxo) and the 
Spinhaler-Registered Trademark- (developed and marketed by Fisons Limited). 
The Turbuhaler-Registered Trademark- (developed and marketed by Astra), a 
multiple dose DPI, is the leading DPI in worldwide sales. In June 1997, the 
FDA approved the first Turbuhaler product, the Pulmicort Turbuhaler, for 
marketing in the U.S., which Astra launched in early 1998. Recently the FDA 
also approved two multiple dose DPIs developed by Glaxo.

COMMON MANAGEMENT. The Technology Agreement, the Development Agreement, the 
Manufacturing and Marketing Agreement and the Albuterol and Product Option 
Agreement (collectively, the "Major Agreements") were approved by Dura, as 
controlling shareholder of Spiros Corp. II, at the time the Major Agreements 
were executed, which, in such capacity, may have influenced the Board of 
Directors of Spiros Corp. II to enter into such agreements. Two of the 
members of the Board of Directors of Spiros Corp. II are persons who are 
directors and/or officers of Dura and each of the three officers of the 
Company are officers of Dura.

LACK OF ARM'S-LENGTH NEGOTIATION. The Development Agreement and the 
Manufacturing and Marketing Agreement were not negotiated on an arm's-length 
basis and Dura and Spiros Corp. II did not retain separate counsel in 
connection therewith. In particular, the Board of Directors of Spiros Corp. 
II may have been influenced by Dura, as the then controlling shareholder of 
Spiros Corp. II, in entering into the Development Agreement and the 
Manufacturing and Marketing Agreement. Dura is the contractor under the 
Development Agreement and will perform or participate in all development and 
other activities thereunder. Additionally, Dura will be primarily responsible 
for the marketing and manufacture of Spiros Products under the Manufacturing 
and Marketing Agreement. Spiros Corp. II will be responsible for and will pay 
the development costs that are incurred by Dura under the Development 
Agreement and the marketing and manufacturing costs incurred by Dura under 
the Manufacturing and Marketing Agreement. Dura will determine unilaterally 
certain activities to be undertaken under the Development Agreement and in 
all events Dura will have substantial influence over all activities and 
procedures (including the timing and priorities thereof) to be undertaken 
under the Development Agreement and the Manufacturing and Marketing 
Agreement. Dura has no obligation to complete any development or other 
activity after all funds of Spiros Corp. II have been expended. Dura's own 
projects and other third party projects may compete for time and resources 
with projects undertaken pursuant to the Development Agreement and the 
Manufacturing and Marketing Agreement and the resources that Dura expends 
under such agreements may therefore be limited.

THE ALBUTEROL OPTION AND THE PRODUCT OPTION. If Dura exercises the Albuterol 
Option for the albuterol product or the Product Option for any other Spiros 
product, it will have sole discretion to control the commercialization of 
such product, including discretion to allocate its marketing resources among 
that product and other Dura products.

THE PURCHASE OPTION EXERCISE PRICE. The Purchase Option exercise price was 
determined by Spiros Corp. II and Dura giving consideration to the Spiros 
products, the agreements between Spiros Corp. II and Dura, such other factors 
as Spiros Corp. II and Dura deemed appropriate and other advice given by the 
underwriters of the Offering. Therefore, such price was not determined on an 
arm's-length basis.

NO ASSURANCE OF SUCCESSFUL DEVELOPMENT OF THE SPIROS PRODUCTS. Spiros Corp. 
II has agreed with Dura that Dura will conduct work on the Spiros Products in 
accordance with the Development Agreement for the purpose of research, 
clinical development, product development, including regulatory approval, and 
commercialization of the Spiros Products. Dura's historical performance has 
no relationship to Spiros Corp. II's potential product development and is not 
indicative of the future performance of Spiros Corp. II. While certain 
research and development on the Spiros Products being transferred to Spiros 
Corp. II by Dura has been conducted, additional clinical studies and product 
development are still to be undertaken. There can be no assurance that Spiros 
Corp. II or Dura will be able to complete the development, gain regulatory 
approval and successfully commercialize any of the Spiros Products or that 
the Spiros

                                      20
<PAGE>

Products can be introduced in a timely manner. The successful development of 
any of the Spiros Products will require demonstration through human clinical 
studies that such Spiros Products are both safe and efficacious.

NO ASSURANCE OF EXERCISE OF DURA'S OPTIONS. Dura is not obligated to exercise 
the Purchase Option, the Albuterol Option or the Product Option, and it will 
exercise such options only if, in the opinion of Dura's Board of Directors, 
it is in Dura's best interest to do so. Even if the Spiros Products are 
developed and approved, if Dura does not exercise the Purchase Option, the 
Albuterol Option or the Product Option, Spiros Corp. II will be required to 
find alternative ways to commercially market or exploit the Spiros Products 
and there can be no assurance that Spiros Corp. II will be able to do so. If, 
in the event Dura fails to exercise the Purchase Option, the Albuterol Option 
and the Product Option and Spiros Corp. II determines to market the Spiros 
Products itself, Spiros Corp. II will require substantial additional funds. 
There can be no assurance that such funds will be available on attractive 
terms, if at all. Similarly, if Spiros Corp. II determines to license the 
Spiros Products to third parties, such arrangements, if available, may be on 
terms less favorable to Spiros Corp. II than the terms of Spiros Corp. II's 
arrangements with Dura.

NO ASSURANCE OF SUFFICIENT FUNDS. Although Spiros Corp. II believes that its 
current funding will be sufficient to enable it to advance three Spiros 
Products through the FDA approval stage, there can be no assurance that this 
will be the case. Until the expiration of the Purchase Option, Spiros Corp. 
II is significantly restricted from raising additional funds without Dura's 
consent and there can be no assurance that Spiros Corp. II will have 
sufficient funds to successfully develop any Spiros Products. While Dura may, 
at its sole option, provide funds for further development of the Spiros 
Products, it is not obligated to do so. If the Purchase Option is not 
exercised, Spiros Corp. II would have to raise substantial funding while 
hiring, or otherwise obtaining access to, research and management personnel.

NO ASSURANCE THAT THE PURCHASE OPTION WILL BE REPRESENTATIVE OF THE VALUE OF 
SPIROS CORP. II. The Purchase Option exercise price was set forth in the 
Spiros Corp. II Amended and Restated Certificate of Incorporation as of the 
date of the closing of the Offering and therefore may not be representative 
of the value of the Spiros Corp. II common stock at the time of the exercise 
of the Purchase Option.

DEPENDENCE ON DURA. Substantially all of the Company's available funds will 
be paid to Dura under the Development Agreement. Payments under the 
Development Agreement will be made for the full amount of all of Dura's 
research and development expenses, general and administrative expenses, 
capital equipment costs and all other costs and expenses incurred by Dura in 
performing the activities, on behalf of Spiros Corp. II, up to the maximum 
amount of the funds available to Spiros Corp. II, which include substantially 
all of the available funds. In addition, Dura will be primarily responsible 
for the marketing and manufacturing of the Spiros Products, if any are 
commercialized prior to the expiration of the Purchase Option. Spiros Corp. 
II is not expected to have its own research, development, clinical, 
licensing, administration, manufacturing or marketing employees or facilities 
and thus will be entirely dependent on Dura in these areas. Subject to their 
respective obligations under the Development Agreement and consistent with 
commercially reasonable practices, Dura will have sole discretion to 
determine the allocation of its research, development, clinical, licensing, 
administration, manufacturing and marketing employees and facilities. 
Although Dura believes that its personnel and facilities currently are or, in 
the future, will be adequate for the performance of its duties under the 
Development Agreement and the Manufacturing and Marketing Agreement, Dura's 
proprietary and collaborative development, licensing, manufacturing and 
marketing projects may compete for time and resources with projects 
undertaken by Spiros Corp. II pursuant to the Development Agreement and the 
Manufacturing and Marketing Agreement, thereby delaying development, 
manufacture and marketing of the Spiros Products. Any material adverse change 
in the business or financial condition of Dura would have a material adverse 
effect upon Spiros Corp. II.

POTENTIAL COMPETITION FROM DURA. Dura is engaged in ongoing licensing and 
development of new products. While Dura has licensed the rights to develop, 
manufacture and commercialize the Spiros Products in connection with the Core 
Technology to Spiros Corp. II, Dura is not prohibited from developing other 
products using Spiros, including those that may compete with the Spiros 
Products, or from in-licensing or acquiring products that may compete with 
the Spiros Products. Dura's activities may, in some circumstances, lead to 
the development, in-licensing or acquisition of products that compete with 
the Spiros Products being developed by Spiros Corp II. It is possible that 
Dura's rights with respect to such competitive products could reduce Dura's 
incentive to exercise the Albuterol Option, the Product Option or the 
Purchase Option.

                                      21
<PAGE>

ABILITY OF SPECIAL SHAREHOLDER TO LIMIT CERTAIN SPIROS CORP. II ACTIVITIES. 
Pursuant to the Company's Amended and Restated Certificate of Incorporation, 
until the expiration of the Purchase Option, no resolution or act of the 
Company to authorize or permit any of the following will be effective without 
the prior written approval of Dura as the holder of all of the outstanding 
Special Shares: (i) the allotment or issue of shares or other securities of 
the Company or the creation of any right to such an allotment or issue; (ii) 
the reduction of the Company's authorized capital stock; (iii) the alteration 
of or any change to the rights, powers, preferences and restrictions of the 
Special Shares; (iv) outstanding borrowings of an aggregate of more than $1 
million at any one time; (v) the sale or other disposition of or the creation 
of any lien or liens on the whole or a material part of the Company's 
business or assets; (vi) the declaration or payment of dividends or the 
making of any other distributions to the Company's shareholders; (vii) the 
merger, consolidation or reorganization of the Company with or into any other 
corporation; (viii) the sale, liquidation or other disposition of all or 
substantially all of the assets of the Company; (ix) the alteration or 
amendment of Articles IV or VII of the Company's Amended and Restated 
Certificate of Incorporation; and (x) the adoption, amendment or repeal of 
the Bylaws of the Company. Accordingly, Dura could preclude the holders of a 
majority of the outstanding Spiros Corp. II Common Stock and the Board of 
Directors of Spiros Corp. II from taking any of the foregoing actions during 
such period. Dura, as holder of all of the outstanding Special Shares, may 
transfer or sell all, but not less than all, of such shares. As a result, an 
unrelated third party may acquire rights associated with the Special Shares, 
including the rights discussed in this section and the right to exercise the 
Albuterol Option, the Product Option and the Purchase Option. There can be no 
assurance that any transferee of the special shares will have the same 
financial resources or development, manufacturing or marketing capabilities 
as Dura, which may have a material adverse effect on the likelihood of the 
exercise of the Albuterol Option, the Product Option or the Purchase Option.

POTENTIAL LOSS OF TECHNOLOGY BY SPIROS CORP. II. Under the Development 
Agreement, Spiros Corp. II is obligated to make payments to Dura equal in the 
aggregate to substantially all of its available funds. If Spiros Corp. II 
does not use its available funds as provided in the Development Agreement or 
otherwise breaches any of its material obligations under the Major 
Agreements, Dura may have the right to terminate the Technology Agreement, 
the Development Agreement and the Manufacturing and Marketing Agreement, and 
thereby reacquire rights to all technology licensed to Spiros Corp. II 
thereunder, including improvements made to such technology using funds 
provided by Spiros Corp. II. In the event of such a termination by Dura, it 
is unlikely that Dura would exercise the Albuterol Option, the Product Option 
or the Purchase Option.

ACCELERATION OF PURCHASE OPTION. If Spiros Corp. II terminates all Major 
Agreements due to a material breach of any of the Major Agreements by Dura, 
the Purchase Option automatically accelerates. The Purchase Option also 
terminates in the event of certain voluntary or involuntary bankruptcy events 
affecting Dura or an uncured material breach by Dura under any of its 
material loan agreements. There can be no assurance that, at that time, the 
development of the Spiros Products will have progressed to a point where Dura 
will have sufficient information to determine whether to exercise the 
Purchase Option. As a result, Dura may determine not to exercise the Purchase 
Option. There can be no assurance that, upon termination of the Development 
Agreement by Spiros Corp. II as described above, alternative arrangements for 
the development of some or all of the Spiros Products could be made or that 
such development of the Spiros Products by Spiros Corp. II would be 
successful.

THIRD-PARTY REIMBURSEMENT; PRICING PRESSURES. The Company's commercial 
success will depend in part on the availability of adequate reimbursement 
from third-party health care payers, such as government and private health 
insurers and managed care organizations. Third-party payers are increasingly 
challenging the pricing of medical products and services. There can be no 
assurance that reimbursement will be available to enable the Company to 
achieve market acceptance of its products, if approved, or to maintain price 
levels sufficient to realize an appropriate return on the Company's 
investment in development. The market for the Company's products, if 
approved, may be limited by actions of third-party payers. For example, many 
managed health care organizations are now controlling the pharmaceuticals 
that are on their formulary lists. The resulting competition among 
pharmaceutical companies to place their products on these formulary lists has 
created a trend of downward pricing pressure in the industry. In addition, 
many managed care organizations are pursuing various ways to reduce 
pharmaceutical costs and are considering formulary contracts primarily with 
those pharmaceutical companies that can offer a full line of products for a 
given therapy sector or disease state. There can be no assurance that the

                                      22
<PAGE>

Company's products, if approved, will be included on the formulary lists of 
managed care organizations or that downward pricing pressure in the industry 
generally will not negatively impact the Company's operations.

LIMITED MANUFACTURING EXPERIENCE. Dura's principal manufacturing facility is 
intended to be used to formulate, mill, blend and manufacture drugs to be 
used with Spiros, pending regulatory approval. Equipment purchases and 
validation are currently scheduled through 1998. Dura's manufacturing 
facility must be registered with and licensed by various regulatory 
authorities and must comply with current cGMP requirements prescribed by the 
FDA and the State of California. Dura will need to significantly scale up its 
current manufacturing operations and comply with cGMPs and other regulations 
prescribed by various regulatory agencies in the U.S. and other countries to 
achieve the prescribed quality and required levels of production of such 
products to obtain marketing approval. Any failure or significant delay in 
the validation of or obtaining a satisfactory regulatory inspection of the 
new facility or failure to successfully scale up could have a material 
adverse effect on the ability of Dura to manufacture products in connection 
with Spiros. Dura intends to utilize third parties to produce components of 
and assemble the Spiros aerosol generator. Such third parties have only 
produced limited quantities of components and assembled generators and will 
be required to significantly scale up their activities. There can be no 
assurance that such third parties will be successful in completing these 
activities in a timely manner or can meet cGMP requirements. Any failure or 
delay in the scale up of aerosol generator manufacturing would have a 
material adverse effect on the ability of Dura to manufacture Spiros Products.

UNCERTAINTY REGARDING PATENTS AND PROPRIETARY TECHNOLOGY; UNPREDICTABILITY OF 
PATENT PROTECTION. The Company's success will depend, in part, on its ability 
to obtain patents, protect trade secrets and other proprietary information 
and operate without infringing upon the proprietary rights of others both in 
the U.S. and abroad. There can be no assurance that patent applications for a 
Spiros product will be approved, that Spiros Corp. II will develop any Spiros 
product to the point that it is patentable, that any issued patents for a 
Spiros product will provide Spiros Corp. II with adequate protection or will 
not be challenged by others, or that the patents of others will not impair 
the ability of Spiros Corp. II to do business. Furthermore, there can be no 
assurance that others will not independently develop similar products, 
duplicate any unpatented Spiros products or design around any patented Spiros 
products in development or marketed by Spiros Corp. II.

The Company will rely on secrecy to protect technology where patent 
protection is not believed to be appropriate or obtainable. There can be no 
assurance that any confidentiality agreement entered into by Dura with third 
parties will not be breached, that Spiros Corp. II will have adequate 
remedies for any breach, that others will not independently develop 
substantially equivalent proprietary information or that third parties will 
not otherwise gain access to proprietary information concerning the Spiros 
products or program technology.

The Company may be required to obtain licenses to patents or other 
proprietary rights of others. No assurance can be given that any licenses 
required under any such patents or proprietary rights would be made available 
on terms acceptable to the Company, if at all . If the Company does not 
obtain such licenses, it could encounter delays in Spiros product market 
introductions or could find that the development, manufacture or sale of the 
Spiros products requiring such licenses could be foreclosed. Moreover, the 
Company could incur substantial costs and diversion of management time in 
defending itself in any suits brought against it claiming infringement of the 
patent rights of others or in asserting the Company's patent rights.

The Company is aware of foreign patents granted to third parties in the 
United Kingdom that claim proprietary rights in areas that may overlap with 
certain Spiros technology. In the event that the Company determines to market 
any Spiros product in the United Kingdom and further determines that such 
activity would infringe upon such third party patents, the Company may need 
to either design around these patents, obtain licenses to such patents, or 
avoid marketing products in the United Kingdom and other areas in Europe in 
which these patents provide protection. There can be no assurance that 
patents or patent applications do not exist or will not exist in the future 
that may materially affect the Company's ability to make, use or sell any 
current or future products.

ATTRACTION AND RETENTION OF KEY PERSONNEL. The Company will be highly 
dependent on the principal members of Dura's scientific and management staff, 
the loss of whose services might impede the achievement of development 
objectives. Recruiting and retaining management and operational personnel and 
qualified scientific personnel to perform research and development work for 
the Company will also be critical to the Company's success. Although the 

                                      23
<PAGE>

Company believes Dura will be successful in attracting and retaining skilled 
and experienced management, operational and scientific personnel, there can 
be no assurance that Dura will be able to attract and retain such personnel 
on acceptable terms given the competition among numerous pharmaceutical 
companies, universities and research institutions for such personnel.

VOLATILITY OF THE COMPANY'S STOCK PRICE. The market prices for securities of 
emerging companies have historically been highly volatile. Future 
announcements concerning the Company, Dura or their competitors may have a 
significant impact on the market price of the Spiros Corp. II Units. Such 
announcements might include financial results, the results of testing, 
technological innovations, new commercial products, changes to government 
regulations, government decisions on commercialization of products, 
developments concerning proprietary rights, litigation or public concern as 
to safety of Spiros Corp. II's and Dura's products.

YEAR 2000 COMPLIANCE CONSIDERATIONS. Spiros Corp. II relies on Dura for its 
operating and financial systems pursuant to the various agreements described. 
The Company has made inquiries of Dura and Dura has responded that it 
recognizes the need to ensure its operations will not be adversely impacted 
by the inability of Dura's systems to process data having dates on or after 
January 1, 2000 ("Year 2000"). Processing errors due to software failure 
arising from calculations using the Year 2000 date are a recognized risk. 
Dura has indicated that it is currently addressing the risk, with respect to 
the availability and integrity of its financial systems and the reliability 
of its operating systems, and is in the process of communicating with 
suppliers, customers, financial institutions and others with whom it conducts 
business to assess whether they are Year 2000 compliant. While the Company 
believes that Dura's planning efforts are adequate to address the Year 2000 
concerns, there can be no assurance that the systems of other companies on 
which Dura's systems and operations rely will be converted on a timely basis 
and will not have a material effect on the Company. In addition, the 
potential impact of the Year 2000 on others with whom the Company, through 
agreements with Dura, does business cannot be reasonably estimated at this 
time. The cost of Dura's Year 2000 initiatives will be paid entirely by Dura.

ITEM 2.   PROPERTIES

The Company's corporate offices are located in San Diego, California. The 
Company does not own any facilities.

ITEM 3.   LEGAL PROCEEDINGS

None.

ITEM 4.   SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

None.

                                    PART II

ITEM 5.   MARKET FOR REGISTRANT'S COMMON EQUITY AND RELATED SHAREHOLDER MATTERS

(a)     Market Information and Holders

On December 22, 1997, the Company and Dura completed the Offering of 
6,325,000 Units. The Units commenced public trading on December 18, 1997. 
High and low sales prices of Units for the period ended December 31, 1997 as 
quoted on the Nasdaq Stock Market were $17 3/4 and $16 1/2, respectively. The 
Units are quoted on the Nasdaq Stock Market under the symbol "SDCOZ" and are 
quoted in the WALL STREET JOURNAL and other newspapers. The Units will trade 
only as Units through December 31, 1999 or such earlier date as the Purchase 
Option is exercised (the "Separation Date"). Prior to the Separation Date, 
application will be made to quote the Common Stock on the Nasdaq Stock Market 
or another quotation system or securities exchange. There can be no assurance 
that the

                                      24
<PAGE>

Common Stock will be eligible for quotation on the Nasdaq Stock Market or any 
other quotation system or securities exchange. The Special Shares are not 
publicly traded.

As of December 31, 1997, there was one holder of record and 2,500 beneficial 
holders of record of Units and one holder of Special Shares.

(b)     Dividends

Spiros Corp. II has not paid any dividends on its Common Stock and does not 
expect to do so in the foreseeable future.  Holders of Spiros Corp. II Common 
Stock are entitled to receive any such dividends as may be recommended by the 
Board of Directors and approved by the holder of the Special Shares. The 
Special Shares are not entitled to receive dividends.

(c)     Recent Sales of Unregistered Securities

In September 1997, the Company sold to Dura 1,000 Special Shares for 
aggregate proceeds of $1,000. The issuance of the Special Shares was not 
registered pursuant to the Securities Act of 1933 as amended (the "Act") and 
the Special Shares were issued in connection with the Company's formation. 
The Special Shares were exempt from registration pursuant to Section 4(2) of 
the Act.

(d)     Use of Proceeds from Registered Securities

On December 22, 1997, the Company and Dura completed the Offering of 
6,325,000 Units, pursuant to a registration statement on Form S-1/S-3 (No. 
333-37673/37673-01). The registration statement was declared effective on 
December 16, 1997. Securities were first offered on December 17, 1997, and 
the Offering closed on December 22, 1997. Merrill Lynch & Co. and Donaldson, 
Lufkin & Jenrette Securities Corporation acted as managing underwriters of 
the offering. The Units were sold to the public at an offering price of 
$16.00 per Unit, with aggregate proceeds of $101.2 million. The Company 
received all proceeds from the Offering, which totaled $94 million, net of 
estimated offering expenses and underwriters' discounts of $7.2 million. 
Offering expenses include $161,000 paid to Dura as reimbursement for direct 
costs incurred by Dura in connection with the Offering. As of December 31, 
1997, all net proceeds from the Offering were invested in cash, cash 
equivalents and short term investments. 

ITEM 6.   SELECTED FINANCIAL DATA

The following data has been derived from the audited financial statements of 
the Company. The information set forth below is not necessarily indicative of 
the results of future operations and should be read in conjunction with 
"Management's Discussion and Analysis of Financial Condition and Results of 
Operations" in Item 7 and the Company's Financial Statements and notes thereto 
in Item 8.

<TABLE>
<CAPTION>
                                                         Period from
                                                      September 23, 1997
                                                  (Date of Incorporation) to
                                                       DECEMBER 31, 1997
                                                       -----------------
            <S>                                         <C>
             Total revenues                                 $    222,000
             Net loss                                       $ (6,924,000)
             Net loss per share: basic and diluted          $      (1.09)
             Total assets                                   $170,506,000
             Total liabilities                              $  8,425,000

</TABLE>

No cash dividends were paid from September 23, 1997 (date of incorporation) 
through December 31, 1997.

                                      25

<PAGE>

ITEM 7.   MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND 
          RESULTS OF OPERATIONS

GENERAL

Spiros Development Corporation II, Inc. ("Spiros Corp. II" or the "Company") 
was incorporated in the state of Delaware on September 23, 1997 for the 
purpose of continuing the development of Spiros-Registered Trademark-, a dry 
powder pulmonary drug delivery system, and to conduct formulation work, 
clinical trials and commercialization for certain specified leading asthma 
and chronic obstructive pulmonary disease ("COPD") drugs for use with Spiros. 
The Company commenced operations on December 22, 1997.

On December 22, 1997, the Company and Dura Pharmaceuticals, Inc. ("Dura") 
completed an initial public offering (the "Offering") of 6,325,000 Units (the 
"Units"), each Unit consisting of one share of Callable Common Stock ("Common 
Stock") of the Company and one warrant to purchase one-fourth of one share of 
Dura common stock at a price of $54.84 per share. The Offering resulted in 
net proceeds to the Company of approximately $94 million. Concurrently, Dura 
contributed $75 million to the Company. Substantially all funds from the 
Offering and the $75 million contribution from Dura and interest earned 
thereon, are expected to be paid to Dura for the development and 
commercialization of Spiros and the use of Spiros with certain drugs pursuant 
to various agreements as described below. Through December 31, 1999, the 
Units will trade publicly. Effective January 1, 2000, the Units will separate 
into the two underlying securities.

Dura, as holder of 100% of the outstanding shares of the Company's Special 
Common Stock, has an irrevocable option (the "Purchase Option") to purchase 
all, but not less than all, of the issued and outstanding shares of the 
Company's Common Stock at predetermined prices. Dura may exercise the 
Purchase Option at any time through the earlier of (a) December 31, 2002, (b) 
the 90th day after the date the Company provides Dura with quarterly 
financial statements of the Company showing cash or cash equivalents of less 
than $5 million, although Dura may extend such period by providing additional 
funding for the continued development of Spiros, but in no event beyond 
December 31, 2002, or (c) upon termination of the technology license, 
development, or the manufacturing agreements between the Company and Dura. If 
the Purchase Option is exercised, the per share price will be $24.01 through 
December 31, 1999, increasing on a quarterly basis to $45.95 per share 
through December 31, 2002. The purchase price may be paid, at Dura's 
discretion, in cash, shares of Dura common stock, or any combination thereof.

In December 1997, the Company and Dura entered into a technology license 
agreement whereby Dura granted to the Company an exclusive, worldwide, 
perpetual royalty-bearing license to use technology owned by Dura relating to 
the use of Spiros with the asthma and COPD drugs albuterol, beclomethasone, 
ipratropium, budesonide, and a combination of albuterol and ipratropium. The 
Company and Dura also executed a series of agreements which provide for the 
development, marketing, and manufacturing of Spiros with specified compounds 
and for the provision of general and administrative services by Dura. Since 
all of the Company's current activities are conducted by Dura under these 
agreements, the Company does not maintain any research staff nor occupy any 
research facilities.

RESULTS OF OPERATIONS

The Company commenced operations in December 1997 and incurred a net loss of 
$6,924,000 for the period September 23, 1997 (date of incorporation) through 
December 31, 1997. Research and development costs for this period totaled 
$7,040,000 and general and administrative expenses totaled $106,000. Research 
and development expenses were for Spiros related activities performed by Dura 
from October 10, 1997 through December 31, 1997. The Company's interest 
income for the period totaled $222,000.

                                      26
<PAGE>

LIQUIDITY AND CAPITAL RESOURCES

The Company's initial capitalization totaled $169 million, consisting of net 
proceeds from the Offering of approximately $94 million and a $75 million 
contribution from Dura. At December 31, 1997, the Company had cash, cash 
equivalents, and short-term investments totaling $170.5 million and working 
capital totaling $162.1 million. The Company believes that its working 
capital and expected cash flows from its cash and short-term investments will 
be sufficient to fund its cash requirements through at least December 31, 
1998.

Spiros Corp. II relies on Dura for its operating and financial systems 
pursuant to the various agreements described. The Company has made inquiries 
of Dura and Dura has addressed that it recognizes the need to ensure its 
operations will not be adversely impacted by the inability of Dura's systems 
to process data having dates on or after January 1, 2000 ("Year 2000"). 
Processing errors due to software failure arising from calculations using the 
Year 2000 date are a recognized risk. Dura has indicated that it is currently 
addressing the risk, with respect to the availability and integrity of its 
financial systems and the reliability of its operating systems, and is in the 
process of communicating with suppliers, customers, financial institutions 
and others with whom it conducts business to assess whether they are Year 
2000 compliant. While the Company believes that Dura's planning efforts are 
adequate to address the Year 2000 concerns, there can be no assurance that 
the systems of other companies on which Dura's systems and operations rely 
will be converted on a timely basis and will not have a material effect on 
the Company. In addition, the potential impact of the Year 2000 on others 
with whom the Company, through agreements with Dura, does business cannot be 
reasonably estimated at this time. The cost of Dura's Year 2000 initiatives 
will be paid entirely by Dura.

ITEM 7A.  QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK.

None.

ITEM 8.   FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

The financial statements are filed as part of this Annual Report on Form 10-K 
(see Item 14).

ITEM 9.   CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND 
          FINANCIAL DISCLOSURE

None.
                                   PART III

ITEM 10.  DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT

(a) Identification of Directors. The information under the caption "Election 
of Directors," appearing in the Proxy Statement to be filed on or about April 9,
1998, is incorporated herein by reference.

(b) Identification of Executive Officers. The information under the caption 
"Executive Officers," appearing in the Proxy Statement to be filed on or 
about April 9, 1998, is incorporated herein by reference.

(c) Compliance with Section 16 (a) of the Exchange Act. The information under 
the caption "Section 16 (a) Beneficial Ownership Reporting Compliance," 
appearing in the Proxy Statement to be filed on or about April 9, 1998, is 
incorporated herein by reference.

                                      27
<PAGE>

ITEM 11.  EXECUTIVE COMPENSATION

The information under the heading "Executive Compensation and Other
Information," appearing in the Proxy Statement to be filed on or about April 9,
1998, is incorporated herein by reference.

ITEM 12.  SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

The information under the headings "Principal Stockholders" and "Security 
Ownership of Management," appearing in the Proxy Statement to be filed on or 
about April 9, 1998, is incorporated herein by reference.

ITEM 13.  CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

The information under the headings "Election of Directors," "Executive 
Compensation and Other Information" and "Certain Business Relationships and 
Related Transactions," appearing in the Proxy Statement to be filed on or 
about April 9, 1998, is incorporated herein by reference.


                                   PART IV

ITEM 14.  EXHIBITS, FINANCIAL STATEMENT SCHEDULES AND REPORTS ON FORM 8-K

(a) 1.     INDEX TO FINANCIAL STATEMENTS
           Independent Auditors' Report
           Balance Sheet
           Statement of Operations
           Statement of Shareholders' Equity
           Statement of Cash Flows
           Notes to Financial Statements


(a) 2.     INDEX TO FINANCIAL STATEMENT SCHEDULES

Financial statement schedules are omitted because they are not required, are 
not applicable or the information is included in the financial statements or 
notes thereto.

(a) 3.     EXHIBITS

<TABLE>
<CAPTION>

     EXHIBIT
       NO.         DESCRIPTION
<C>  <C>       <S>
(1)   3.1      Amended and Restated Certificate of Incorporation.

(1)   3.2      Amended and Restated Bylaws.

      4.1      Purchase option held by Dura Pharmaceuticals, Inc. to
               purchase all of the outstanding Callable Common Stock of the
               Company (included in Exhibit 3.1).
</TABLE>

                                 28
<PAGE>

<TABLE>
<CAPTION>
<C>   <C>      <S>
      4.2      Specimen Unit Certificate.

      4.3      Specimen Certificate of Callable Common Stock.

      4.4      Stock Certificate of Special Common Stock.

      10.1     Technology License Agreement dated December 22, 1997 between
               the Company, Dura Pharmaceuticals, Inc., Dura Delivery
               Systems, Inc. and Spiros Development Corporation.

      10.2     Development Agreement dated December 22, 1997 between the
               Company and Dura Pharmaceuticals, Inc.

      10.3     Albuterol and Product Option Agreement dated December 22, 1997
               between the Company and Dura Pharmaceuticals, Inc.

      10.4     Manufacturing and Marketing Agreement dated December 22,
               1997 between the Company and Dura Pharmaceuticals, Inc.

      10.5     Services Agreement dated December 22, 1997 between the
               Company and Dura Pharmaceuticals, Inc.

      10.6 +   1997 Stock Option Plan.

      10.7 +   Form of Notice of Grant of Stock Option.

      10.8 +   Form of Stock Option Agreement.

(1)   10.9 +   Form of Indemnification Agreement between the Company and each of
               its directors.

(1)   10.10 +  Form of Indemnification Agreement between the Company and each of
               its officers.

      24.1     Power of Attorney (See Signature page).

      27.1     Financial Data Schedule.

</TABLE>

      (1)      Incorporated by reference to the Company's Registration Statement
               on Forms S-1/S-3 (No. 333-37673/37673-01), filed on October 10,
               1997, as amended.
      +        Management contract or compensation plan or arrangement.

(b) REPORTS ON FORM 8-K.

None.

SUPPLEMENTAL INFORMATION

The Annual Report on Form 10-K and Proxy material will be furnished to the
Company's shareholders subsequent to the filing of this report and the Company
will furnish such material to the Securities and Exchange Commission at that
time.

                                      29
<PAGE>

                                   SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities 
Exchange Act of 1934, the Registrant has duly caused this Annual Report on 
Form 10-K to be signed on its behalf by the undersigned, thereunto duly 
authorized.

Date:   MARCH  27,  1998         SPIROS DEVELOPMENT CORPORATION II, INC.


                                 By:   /S/ DAVID S. KABAKOFF
                                    --------------------------------------------
                                 David S. Kabakoff
                                 Chairman, President and Chief Executive Officer


                                 POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS, that each person whose signature appears 
below constitutes and appoints David S. Kabakoff and Erle T. Mast, or either 
of them, as his true and lawful attorneys-in-fact and agents, with full power 
of substitution, for him and in his name, place and stead, in any and all 
capacities, to sign any and all amendments to this Annual Report on Form 
10-K, and to file the same, with all exhibits thereto, and other documents in 
connection therewith, with the Securities and Exchange Commission, granting 
unto said attorneys-in-fact and agents, full power and authority to do and 
perform each and every act and thing requisite and necessary to be done in 
connection therewith as fully to all intents and purposes as he might or 
could do in person, hereby ratifying and confirming all that said 
attorneys-in-fact and agents, or their substitute or substitutes may lawfully 
do or cause to be done by virtue hereof.

PURSUANT TO THE REQUIREMENTS OF THE SECURITIES EXCHANGE ACT OF 1934, THIS 
ANNUAL REPORT ON FORM 10-K HAS BEEN SIGNED BELOW BY THE FOLLOWING PERSONS ON 
BEHALF OF THE REGISTRANT AND IN THE CAPACITIES AND ON THE DATES INDICATED.

<TABLE>
<CAPTION>

SIGNATURE                                      TITLE                          DATE
- ---------                                      -----                          ----
<S>                       <C>                                            <C>

/s/ DAVID S. KABAKOFF                Chairman, President and             MARCH 27, 1998
- ------------------------             Chief Executive Officer             
(David S. Kabakoff)               (Principal Executive Officer) 
                                  

/s/ ERLE T. MAST                        Vice President and               MARCH 27, 1998
- ------------------------            Chief Financial Officer           
(Erle T. Mast)            (Principal Financial and Accounting Officer)
                          

/s/ CAM L. GARNER                          Director                      MARCH 27, 1998
- ------------------------
(Cam L. Garner)

/s/ SOL LIZERBRAM                          Director                      MARCH 27, 1998
- ------------------------                                  
(Sol Lizerbram)

 /s/ ALAIN B. SCHREIBER                    Director                      MARCH 27, 1998
- ------------------------                           
(Alain B. Schreiber)

/s/ ROBERT S. WHITEHEAD                    Director                      MARCH 27, 1998
- ------------------------                                     
(Robert S. Whitehead)

</TABLE>

                                      30

<PAGE>

                                  EXHIBIT INDEX
                                       TO
                                    FORM 10-K
<TABLE>
<CAPTION>

     EXHIBIT
       NO.     DESCRIPTION
<C>   <C>      <S>
(1)    3.1     Amended and Restated Certificate of Incorporation.

(1)    3.2     Amended and Restated By-laws.

       4.1     Purchase option held by Dura Pharmaceuticals, Inc. to purchase
               all of the outstanding Callable Common Stock of the Company
               (included in Exhibit 3.1)

       4.2     Specimen Unit Certificate.

       4.3     Specimen Certificate of Callable Common Stock.

       4.4     Stock Certificate of Special Common Stock.

       10.1    Technology License Agreement dated December 22, 1997 between
               the Company, Dura Pharmaceuticals, Inc., Dura Delivery
               Systems, Inc. and Spiros Development Corporation.

       10.2    Development Agreement dated December 22, 1997 between the
               Company and Dura Pharmaceuticals, Inc.

       10.3    Albuterol and Product Option Agreement dated December 22, 1997
               between the Company and Dura Pharmaceuticals, Inc.

       10.4    Manufacturing and Marketing Agreement dated December 22,
               1997 between the Company and Dura Pharmaceuticals, Inc.

       10.5    Services Agreement dated December 22, 1997 between the
               Company and Dura Pharmaceuticals, Inc.

       10.6 +  1997 Stock Option Plan.

       10.7 +  Form of Notice of Grant of Stock Option.

       10.8 +  Form of Stock Option Agreement.

(1)    10.9 +  Form of Indemnification Agreement between the Company and each of
               its directors.

(1)    10.10+  Form of Indemnification Agreement between the Company and each of
               its officers.

       24.1    Power of Attorney (See Signature page).

       27.1    Financial Data Schedule.
</TABLE>
       (1)     Incorporated by reference to the Company's Registration Statement
               on Forms S-1/S-3 (No. 333-37673/37673-01), filed on October 10,
               1997, as amended.
       +       Management contract or compensation plan or arrangement.

                                      31
<PAGE>

                     SPIROS DEVELOPMENT CORPORATION II, INC.

                          INDEX TO FINANCIAL STATEMENTS


<TABLE>
<CAPTION>

                                                                      PAGE
<S>                                                             <C> 
Independent Auditors' Report                                           F-1

Balance Sheet as of December 31, 1997                                  F-2

Statement of Operations for the Period
  September 23, 1997 (Date of Incorporation) through
  December 31, 1997                                                    F-3

Statement of Shareholders' Equity for the Period 
  September 23, 1997 (Date of Incorporation) through
  December 31, 1997                                                    F-4

Statement of Cash Flows for the Period September 23, 1997
  (Date of Incorporation) through December 31, 1997                    F-5

Notes to Financial Statements                                          F-6

</TABLE>

<PAGE>

                          INDEPENDENT AUDITORS' REPORT


To the Board of Directors and Shareholders of Spiros Development Corporation 
II, Inc.:

We have audited the accompanying balance sheet of Spiros Development 
Corporation II, Inc. (a development stage enterprise) (the "Company") as of 
December 31, 1997, and the related statements of operations, shareholders' 
equity and cash flows for the period September 23, 1997 (date of 
incorporation) through December 31, 1997. These financial statements are the 
responsibility of the Company's management. Our responsibility is to express 
an opinion on the financial statements based on our audit.

We conducted our audit in accordance with generally accepted auditing 
standards. Those standards require that we plan and perform the audit to 
obtain reasonable assurance about whether the financial statements are free 
of material misstatement. An audit includes examining, on a test basis, 
evidence supporting the amounts and disclosures in the financial statements. 
An audit also includes assessing the accounting principles used and 
significant estimates made by management, as well as evaluating the overall 
financial statement presentation. We believe that our audit provides a 
reasonable basis for our opinion.

In our opinion, such financial statements present fairly, in all material 
respects, the financial position of the Company as of December 31, 1997, and 
the results of its operations and its cash flows for the period September 23, 
1997 (date of incorporation) through December 31, 1997 in conformity with 
generally accepted accounting principles.


/s/ Deloitte & Touche LLP

San Diego, California
February 12, 1998

<PAGE>

SPIROS DEVELOPMENT CORPORATION II, INC.
(A DEVELOPMENT STAGE ENTERPRISE)

<TABLE>
<CAPTION>

BALANCE SHEET
DECEMBER 31, 1997
(IN THOUSANDS, EXCEPT SHARE AND PER SHARE AMOUNTS)
- -------------------------------------------------------------------------------
<S>                                                           <C>

ASSETS

CURRENT ASSETS:
  Cash and cash equivalents                                     $139,035
  Short-term investments                                          31,471
                                                                --------
           Total current assets                                  170,506
                                                                --------
TOTAL                                                           $170,506
                                                                --------
                                                                --------
LIABILITIES AND SHAREHOLDERS' EQUITY

CURRENT LIABILITIES:
  Payable to Dura Pharmaceuticals, Inc.                          $ 8,399
  Accrued liabilities                                                 26
                                                                --------
           Total current liabilities                               8,425
                                                                --------
COMMITMENTS AND CONTINGENCIES (Note 4)

SHAREHOLDERS' EQUITY:
  Special common stock, par value $1.00, 1,000 shares
    authorized, issued and outstanding                                 1
  Callable common stock, par value $.001, 7,500,000 shares
    authorized; 6,325,000 shares issued and outstanding                6
  Additional paid-in capital                                     168,977
  Unrealized gain on investments                                      21
  Accumulated deficit                                             (6,924)
                                                                --------
           Total shareholders' equity                            162,081
                                                                --------
TOTAL                                                           $170,506
                                                                --------
                                                                --------
</TABLE>

See accompanying notes to financial statements.

                                     F-2



<PAGE>

SPIROS DEVELOPMENT CORPORATION II, INC.
(A DEVELOPMENT STAGE ENTERPRISE)

<TABLE>
<CAPTION>

STATEMENT OF OPERATIONS
FOR THE PERIOD SEPTEMBER 23, 1997 (DATE OF INCORPORATION)
THROUGH DECEMBER 31, 1997
(in thousands, except per share amount)
- -------------------------------------------------------------------------------
<S>                                                                <C>

REVENUES:
  Interest income                                                   $   222
                                                                    -------
EXPENSES:
  Research and development                                            7,040
  General and administrative                                            106
                                                                    -------
           Total                                                      7,146
                                                                    -------
NET LOSS                                                            $(6,924)
                                                                    -------
                                                                    -------
NET LOSS PER SHARE:
  Basic and diluted                                                 $ (1.09)
                                                                    -------
                                                                    -------
WEIGHTED AVERAGE NUMBER OF COMMON SHARES:
  Basic and diluted                                                   6,325

</TABLE>

See accompanying notes to financial statements.

                                     F-3

<PAGE>

SPIROS DEVELOPMENT CORPORATION II, INC.
(A DEVELOPMENT STAGE ENTERPRISE)

<TABLE>
<CAPTION>

STATEMENT OF SHAREHOLDERS' EQUITY
FOR THE PERIOD SEPTEMBER 23, 1997 (DATE OF INCORPORATION)
THROUGH DECEMBER 31, 1997
(in thousands)
- -----------------------------------------------------------------------------------------------------------------------------------
                                       Special               Callable        
                                    Common Stock           Common Stock        Additional     Unrealized                           
                                --------------------   --------------------     Paid-in         Gain on     Accumulated            
                                 Shares      Amount     Shares      Amount      Capital       Investments     Deficit       Total 
                                --------    --------   --------    --------    ----------     -----------   -----------   ---------
<S>                             <C>         <C>        <C>         <C>         <C>            <C>           <C>           <C>

Sale of special common stock          1       $  1                                                                         $     1

Sale of callable common stock                            6,325        $  6      $ 93,961                                    93,967

Contribution from Dura
  Pharmaceuticals, Inc.                                                           75,000                                    75,000

Compensation expense for stock
  options granted                                                                     16                                        16

Unrealized gain on investments                                                                   $  21                          21

Net loss                                                                                                      $(6,924)      (6,924)
                                   ----       ----      -----        ----       --------         -----        -------     --------
BALANCE, DECEMBER 31, 1997            1       $  1      6,325        $  6       $168,977         $  21        $(6,924)    $162,081
                                   ----       ----      -----        ----       --------         -----        -------     --------
                                   ----       ----      -----        ----       --------         -----        -------     --------
</TABLE>

See accompanying notes to financial statements.

                                      F-4
<PAGE>


SPIROS DEVELOPMENT CORPORATION II, INC.
(A DEVELOPMENT STAGE ENTERPRISE)

<TABLE>
<CAPTION>

STATEMENT OF CASH FLOWS
FOR THE PERIOD SEPTEMBER 23, 1997 (DATE OF INCORPORATION)
THROUGH DECEMBER 31, 1997
(in thousands)
- ---------------------------------------------------------------------------------------------------------
<S>                                                                                       <C>

OPERATING ACTIVITIES:
  Net loss                                                                                  $  (6,924)
  Adjustments to reconcile net loss to net cash provided by operating activities:
    Compensation expense for stock options granted                                                 16
    Changes in assets and liabilities:
      Payable to Dura Pharmaceuticals, Inc.                                                     7,110
      Accrued liabilities                                                                          26
                                                                                             --------
           Net cash provided by operating activities                                              228
                                                                                             --------
INVESTING ACTIVITIES:
  Purchases of short-term investments                                                         (31,450)
                                                                                             --------
FINANCING ACTIVITIES:
  Net proceeds from issuance of special common and callable common stock                       93,968
  Contribution from Dura Pharmaceuticals, Inc. for purchase option                             75,000
  Increase in payable to Dura Pharmaceuticals, Inc. for issuance costs                          1,289
                                                                                             --------
           Net cash provided by financing activities                                          170,257
                                                                                             --------
NET INCREASE IN CASH AND CASH EQUIVALENTS                                                     139,035

CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD                                                   --
                                                                                             --------
CASH AND CASH EQUIVALENTS AT END OF PERIOD                                                   $139,035
                                                                                             --------
                                                                                             --------
</TABLE>

See accompanying notes to financial statements.

                                     F-5
<PAGE>

SPIROS DEVELOPMENT CORPORATION II, INC.
(A DEVELOPMENT STAGE COMPANY)
NOTES TO FINANCIAL STATEMENTS


1.   ORGANIZATION

Spiros Development Corporation II, Inc. (the "Company") was incorporated in 
the state of Delaware on September 23, 1997 for the purpose of continuing the 
development of Spiros-Registered Trademark-, a dry powder pulmonary drug 
delivery system, and to conduct formulation work, clinical trials and 
commercialization for certain specified leading asthma and chronic 
obstructive pulmonary disease ("COPD") drugs for use with Spiros. The Company 
commenced operations on December 22, 1997. The accompanying financial 
statements reflect the activities of the Company for the period September 23, 
1997 (date of incorporation) through December 31, 1997.

On December 22, 1997, the Company and Dura Pharmaceuticals, Inc. ("Dura") 
completed an initial public offering (the "Offering") of 6,325,000 Units, 
each Unit consisting of one share of callable common stock of the Company and 
one warrant to purchase one-fourth of one share of Dura common stock. The 
offering resulted in net proceeds to the Company of approximately $94 
million. Concurrently, Dura contributed $75 million to the Company. 
Substantially all funds from the Offering, the $75 million contribution and 
interest earned thereon, are expected to be paid to Dura for the development 
and commercialization of Spiros and the use of Spiros with certain drugs 
pursuant to various agreements (Note 4).

2.   SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

BASIS OF PRESENTATION - Because the Company has not yet completed product 
development, obtained regulatory approval or verified the market acceptance 
and demand for Spiros, its activities have been accounted for as those of a 
"development stage enterprise," as set forth in Statement of Financial 
Accounting Standards ("SFAS") No. 7, "Accounting and Reporting by Development 
Stage Enterprises."

USE OF ESTIMATES - The preparation of financial statements in conformity with 
generally accepted accounting principles requires management to make 
estimates and assumptions that affect amounts reported in the financial 
statements and related notes. Changes in those estimates may affect amounts 
reported in future periods.

CASH AND CASH EQUIVALENTS - The Company considers cash equivalents to include 
only highly liquid securities with an original maturity of three months or 
less. Investments with an original maturity of more than three months from 
the date of acquisition are considered short-term investments.

SHORT-TERM INVESTMENTS - The Company has classified all of its short-term 
investments as available-for-sale. The entire amount of the Company's 
portfolio is available for current operations. Investments are carried at 
fair value as determined by quoted market prices, with unrealized gains and 
losses reported as a separate component of shareholders' equity. Investment 
income is recognized when earned and includes the amortization of premiums 
and discounts on investments. The Company invests its excess cash in money 
market and fixed income securities of companies with strong credit ratings 
and U.S. government obligations.

RESEARCH AND DEVELOPMENT COSTS - Research and development costs are expensed 
as incurred.

STOCK BASED COMPENSATION - As permitted by SFAS No. 123, "Accounting for 
Stock Based Compensation," the Company accounts for the costs associated with 
stock option grants to employees in accordance with Accounting Principles 
Board Opinion No. 25, "Accounting for Stock Issued to Employees" and related 
interpretations ("APB 25"). Compensation expense for costs associated with 
stock option grants to non-employees is recognized ratably over the vesting 
period.

                                     F-6
<PAGE>

NET LOSS PER SHARE - The Company incurred a net loss for the period ended 
December 31, 1997 and, as such, the weighted average number of shares of 
Callable Common Stock used for basic and diluted earnings per share does not 
include potential common shares from outstanding stock options as their 
inclusion would be antidilutive. The weighted average number of shares also 
exclude shares of special common stock ("Special Shares") outstanding since 
such shares are not entitled to participate in the profits of the Company.

3.   SHORT-TERM INVESTMENTS

The following is a summary of the Company's short-term investments as of 
December 31, 1997 (in thousands):

<TABLE>
<CAPTION>

                                                    Unrealized        Fair
                                          Cost        Gains           Value
                                         ------     ----------       -------
<S>                                    <C>          <C>              <C>

Corporate debt securities               $31,450         $21          $31,471

</TABLE>

The amortized cost and fair value of short-term investments as of December 
31, 1997, by contractual maturity, are as follows (in thousands):

<TABLE>
<CAPTION>
                                                         Fair
                                    Cost                 Value
                                   ------               -------
<S>                              <C>                  <C>
  
Due in one year or less           $23,788               $23,803
Due after one year through
  two years                         7,662               7,668
                                  -------             -------
                                  $31,450             $31,471
                                  -------             -------
                                  -------             -------
</TABLE>


4.   ARRANGEMENTS WITH DURA PHARMACEUTICALS, INC.

The Company and Dura are party to various agreements entered into in December 
1997 which provide for the development, marketing, and manufacturing of 
Spiros with specified compounds and for the provision of general and 
administrative services by Dura. A summary of these agreements is presented 
below.

TECHNOLOGY LICENSE AGREEMENT - Under this agreement, Dura granted to the 
Company an exclusive, worldwide (except for the use of beclomethasone in 
certain parts of Asia), perpetual, royalty-bearing license to use technology 
owned or controlled by Dura relating to the use of Spiros (the "Core 
Technology") with the Compounds (collectively, the "Spiros Products"). In 
consideration for these rights, the Company will pay, commencing in 1998, an 
annual technology access fee equal to the greater of (a) 5% of the net sales 
of each Spiros Product, or (b) $2 million. This obligation will terminate, on 
a country-by-country basis, (a) within 10 years from the first sale of such 
Spiros Product in those countries where no patents covering such product are 
issued and (b) in those countries where patents covering the Spiros Products 
are issued, upon the last expiration of the applicable patents.

The Technology License Agreement will remain in effect indefinitely, unless 
terminated by mutual agreement of the Company and Dura or upon Dura's 
exercise or expiration of its Purchase Option.

ALBUTEROL AND PRODUCT OPTION AGREEMENT - Under this agreement, the Company 
granted to Dura the option to acquire for specified time periods the 
Albuterol Option and the Product Option. The Albuterol Option is currently 
exercisable and expires 360 days after receipt of U.S. Food and Drug 
Administration (the "FDA") approval to market. The Product Option is 
currently exercisable and expires 90 days after receipt of FDA approval to 
market such Spiros Product. The formula for determining the purchase price 
for each of the products is set forth in the agreement and is based, in part, 
on the costs incurred by the Company for the development of the products.

                                     F-7
<PAGE>
 
DEVELOPMENT AGREEMENT - Under this agreement, the Company has engaged Dura to 
develop Spiros for use with the Spiros Products. Dura furnishes all labor, 
supervision, services, supplies, and materials necessary to perform the 
development activities and obtain regulatory approvals for the sale and 
marketing of the Spiros Products. These activities are carried out by Dura in 
accordance with annual workplans and budgets which are subject to approval 
and acceptance by the Company's Board of Directors. Payments to Dura for 
services provided under the Development Agreement are based on fully-burdened 
costs incurred by Dura plus rates ranging from 20 to 25 percent.

MANUFACTURING AND MARKETING AGREEMENT - Under this agreement, the Company 
granted to Dura an exclusive, worldwide license to manufacture and market the 
Spiros Products. Dura will pay the Company on a quarterly basis a royalty of 
7% of the net sales of each Spiros Product. Prior to the expiration of the 
Product Option for albuterol, no royalty payment will be made with respect to 
net sales of the albuterol product. The Manufacturing and Marketing Agreement 
will terminate upon exercise or termination of the Purchase Option or by 
mutual agreement of the Company and Dura at any time. In the event Dura 
exercises either of its options under the Albuterol and Product Purchase 
Option Agreement, the Manufacturing and Marketing Agreement will terminate 
with respect to the applicable Spiros Product.

SERVICES AGREEMENT - Under this agreement, Dura will provide certain 
management and administrative services to the Company at the rate of $100,000 
per calendar quarter. In addition, the Company will reimburse Dura for all 
costs and expenses incurred by Dura in connection with the Offering, net of 
amounts reimbursed by the underwriters. Included in payables to Dura as of 
December 31, 1997 is $1,289,000 for such Offering expenses. The Services 
Agreement terminates upon exercise by Dura of the Purchase Option or 12 
months after the expiration of the Purchase Option.

The Company's President and Chief Executive Officer, Vice President and Chief 
Financial Officer, and Secretary are also officers of Dura. In addition, two 
members of the Company's board of directors are officers of Dura, one of whom 
is the Company's president.

5.   SHAREHOLDERS' EQUITY

The Company's authorized capital stock consists of 7,500,000 shares of Common 
Stock, of which 6,325,000 shares were issued and outstanding as of December 
31, 1997, and 1,000 shares of Special Shares, of which 1,000 shares were 
issued and outstanding as of December 31, 1997.

Dura, as the holder of 100% of the Special Shares, has an irrevocable option 
(the "Purchase Option") to purchase all, but not less than all, of the issued 
and outstanding shares of the Company's Callable Common Stock at 
predetermined prices. Dura may exercise the Purchase Option at any time 
through the earlier of (a) December 31, 2002, (b) the 90th day after the date 
the Company provides Dura with quarterly financial statements of the Company 
showing cash or cash equivalents of less than $5 million, although Dura may 
extend such period by providing additional funding for the continued 
development of the Spiros Products, but in no event beyond December 31, 2002, 
or (c) upon termination of the Technology License, Development, or the 
Manufacturing and Marketing Agreements between the Company and Dura (Note 4). 
If the Purchase Option is exercised, the per share purchase price will be 
$24.01 through December 31, 1999, increasing on quarterly basis to $45.95 per 
share through December 31, 2002. The Purchase Option price may be paid, at 
Dura's discretion, in cash, shares of Dura common stock, or any combination 
thereof. Dura has no legal obligation to exercise the Purchase Option. 
Through December 31, 1999, each share of the Company's Callable Common Stock 
is combined to trade publicly as a unit with one warrant, expiring on January 
1, 2003, to purchase one-fourth of one share of Dura's common stock at a 
price per share of $54.84.

As holder of the Special Shares, Dura also has the right to elect two members 
of the Company's board of directors and must approve certain corporate 
transactions as set forth in the Company's Amended and Restated Certificate 
of Incorporation, including (i) the allotment or issue of shares or other 
securities of the Company or the creation of any right to such an allotment 
or issue; (ii) the reduction of the Company's authorized capital stock; (iii) 
the alteration of or any change to the rights, powers, preferences and 
restrictions of the Special Shares; (iv) outstanding borrowings

                                     F-8
<PAGE>

of an aggregate of more than $1 million at any one time; (v) the sale or 
other disposition of or the creation of any lien or liens on the whole or a 
material part of the Company's business or assets; (vi) the declaration or 
payment of dividends or the making of any other distributions to the 
Company's shareholders; (vii) the merger, consolidation or reorganization of 
the Company with or into any other corporation; (viii) the sale, liquidation 
or other disposition of all or substantially all of the assets of the 
Company; (ix) the alteration or amendment of Articles IV or VII of the 
Company's Amended and Restated Certificate of Incorporation; and (x) the 
adoption, amendment or repeal of the Bylaws of the Company. As holder of the 
Special Shares, however, Dura does not have the right to any profits of the 
Company.

6.   STOCK COMPENSATION PLAN

The Company has adopted the 1997 Stock Option Plan (the "Plan") to provide 
for the initial issuance of up to 700,000 stock options to employees, board 
members, and consultants or other independent advisors who provide services 
to the Company. The number of shares issuable under the Plan is subject to an 
automatic annual increase on February 15 of each calendar year, beginning 
with the 1998 calendar year, by the number of shares necessary to cause the 
total number shares authorized under the Plan to be equal to 15% of the then 
outstanding shares of Common Stock of the Company. Generally, options are to 
be granted at prices equal to at least 100% of the fair market value of the 
Company's Common Stock at the date of grant, expire not later than 10 years 
from the date of grant, and become vested upon Dura's exercise of its 
Purchase Option (Note 5) or five years from the date of grant, whichever is 
earlier. Options shall be canceled if the optionee ceases to provide services 
to the Company prior to the vesting date.

In December 1997, the Company granted 548,000 options with an exercise price 
of $14 per share, all of which were outstanding as of December 31, 1997. The 
options expire in December 2007 and none were exercisable as of December 31, 
1997.

In accordance with SFAS No. 123, the Company applies the provisions of APB 25 
in accounting for stock options granted to employees and, accordingly, no 
compensation expense has been recognized for options granted to employees. In 
accordance with SFAS 123, options granted to non-employees are accounted for 
based on their estimated fair value at grant date. Compensation expense equal 
to the options' estimated fair value is recognized over the vesting period. 
During the period ended December 31, 1997, 341,000 options were granted to 
non-employees for which the Company recorded compensation expense of $16,000. 
If the Company had elected to recognize compensation expense for options 
granted to employees based on the estimated fair value of the options as of 
the grant date, the net loss for the period ended December 31, 1997 would 
have been increased by $10,000. The estimated weighted average fair value at 
grant date of options granted during the period ended December 31, 1997 was 
$4.58. The fair value was estimated using the Black-Scholes option-pricing 
model with the following assumptions:

<TABLE>

       <S>                                       <C>

        Expected dividend yield                    None
        Expected stock price volatility            30%
        Risk-free interest rate                    5.7%
        Expected life of options                   4 years

</TABLE>

7.   INCOME TAXES

As of December 31, 1997, the Company has a deferred tax asset totaling 
approximately $2.4 million which relates primarily to federal net operating 
loss carryforwards of approximately $6.9 million expiring in 2012. Because 
the Company performs research and development and the prospect of generating 
future earnings is uncertain, the deferred tax asset has been fully reserved.

                                     F-9


                           SPECIMEN UNIT CERTIFICATE

THE SECURITIES OF SPIROS DEVELOPMENT CORPORATION II, INC. ARE SUBJECT TO AN
OPTION BY THE HOLDER OF THE SPECIAL COMMON STOCK OF SPIROS DEVELOPMENT
CORPORATION II, INC. AS DESCRIBED IN ARTICLE V OF THE AMENDED AND RESTATED
CERTIFICATE OF INCORPORATION OF SPIROS DEVELOPMENT CORPORATION II, INC. TO
PURCHASE SUCH SECURITIES AT AN AGREED UPON PRICE EXERCISABLE BY NOTICE AT ANY
TIME COMMENCING ON THE CLOSING DATE OF THE UNIT OFFERING AND ENDING ON THE
EARLIER OF (i) DECEMBER 31, 2002, (ii) THE 90TH DAY AFTER THE DATE SPIROS
DEVELOPMENT CORPORATION II, INC. DELIVERS QUARTERLY FINANCIAL STATEMENTS OF
SPIROS DEVELOPMENT CORPORATION II, INC. TO THE HOLDER OF THE SPECIAL COMMON
STOCK SHOWING CASH OR CASH EQUIVALENTS OF LESS THAN $5 MILLION AND (iii) THE
DATE OF TERMINATION BY SPIROS DEVELOPMENT CORPORATION II, INC. OF THAT CERTAIN
TECHNOLOGY LICENSE AGREEMENT, DEVELOPMENT AGREEMENT OR MANUFACTURING AND
MARKETING AGREEMENT DATED ON OR ABOUT DECEMBER 22, 1997. COPIES OF THE AMENDED
AND RESTATED CERTIFICATE OF INCORPORATION OF SPIROS DEVELOPMENT CORPORATION II,
INC. ARE AVAILABLE AT THE OFFICES OF SPIROS DEVELOPMENT CORPORATION II, INC.,
7475 LUSK BOULEVARD, SAN DIEGO, CALIFORNIA 92121, AND WILL BE FURNISHED TO ANY
STOCKHOLDER OF SPIROS DEVELOPMENT CORPORATION II, INC. ON REQUEST AND WITHOUT
COST. 

                     Spiros Development Corporation II, Inc.

                           Dura Pharmaceuticals, Inc.

                               U-_____ _____ UNITS

                                UNIT CERTIFICATE
                            Each Unit Consisting of
        One Share of Callable Common Stock, par value $0.001 per share,
                of Spiros Development Corporation II, Inc. and
        One Warrant to Purchase One-Fourth of One Share of Common Stock,
           par value $0.001 per share, of Dura Pharmaceuticals, Inc.

                             SEE REVERSE SIDE FOR
                             CERTAIN DEFINITIONS

CUSIP 848935 20 1

     THIS IS TO CERTIFY that 
                                    or registered assigns, is the registered
holder of the number of Units, offered pursuant to a Registration Statement 
on Forms S-1/S-3 (the "Registration Statement"), set forth above ("Units"), 
each of which entitles the holder to one share of callable common stock (the 
"Callable Common Stock" or the "Shares"), par value $0.001 per share, of 
Spiros Development Corporation II, Inc. ("SDC II") and one warrant (the 
"Warrants") to purchase one-fourth of one share of common stock ("Dura Common 
Stock"), par value $0.001 per share, of Dura Pharmaceuticals, Inc. ("Dura"). 
Each Warrant entitles the holder to purchase one-fourth of one share of Dura 
Common Stock at an exercise price of $54.84 per share of Dura Common Stock 
subject to adjustment, at any time after the securities included in the Units 
become separately transferable through December 31, 2002. Capitalized terms 
not otherwise defined herein shall have the meanings given to them in the 
Registration Statement.

     The Callable Common Stock and the Warrants may not be traded separately 
until December 31, 1999 or such earlier date as the Purchase Option is 
exercised or expires unexercised. At any time after the securities are 
separately transferable, this Unit Certificate is exchangeable upon the 
surrender hereof by the registered holder to the Transfer Agent in exchange 
for one or more new Stock Certificates, representing in the 

<PAGE>

aggregate the number of Shares comprising the Units represented hereby, and 
one or more new Warrant Certificates, representing in the aggregate the 
number of Warrants comprising the Units represented hereby. 

     SDC II and Dura, respectively, agree at all times to reserve or hold 
available a sufficient number of shares of its Callable Common Stock and 
Warrants to cover the number of securities issuable upon the exchange of this 
Certificate and the exercise of rights of the underlying securities.

     This Unit Certificate entitles the holder hereof, either at law or in 
equity, to any rights as a shareholder of SDC II or warrant holder of Dura as 
shall pertain to the underlying securities.

     This Unit Certificate is exchangeable at any time upon the surrender 
hereof by the registered holder to the Transfer Agent for one or more new 
Unit Certificates of like tenor and date representing in the aggregate the 
right to the number of Units represented hereby.

     SDC II and Dura (the "Companies") may deem and treat the registered 
holder of this Unit Certificate at any time as the absolute owner hereof and 
of the securities covered hereby for all purposes and shall not be affected 
by any notice to the contrary.

     The Warrants covered by this Certificate are subject to the terms of the 
Warrant Agreement. The Warrant Agreement is available at the executive 
offices of Dura.

     The Warrant Agreement is incorporated herein by reference and made a 
part hereof and reference is hereby made thereto for a full description of 
the rights, limitations of rights, obligations, duties and immunities 
hereunder. 

     The terms of this Unit Certificate shall be governed by the laws of  the 
State of California without giving effect to conflicts of law principles 
thereof.

     This Unit Certificate shall not be valid or obligatory for any purpose 
unless countersigned by the Transfer Agent.

     IN WITNESS WHEREOF, the Companies have caused this Unit Certificate to 
be executed by its duly authorized officers. 

Dated:

Spiros Development Corporation II, Inc.

PRESIDENT     SECRETARY

Dura Pharmaceuticals, Inc.

PRESIDENT     SECRETARY

COUNTERSIGNED AND REGISTERED:
CHASEMELLON SHAREHOLDER SERVICES, L.L.C.
TRANSFER AGENT AND REGISTRAR

BY

AUTHORIZED SIGNATURE

                                 [REVERSE SIDE]

KEEP THIS CERTIFICATE IN A SAFE PLACE. IF IT IS LOST, STOLEN, OR DESTROYED THE
CORPORATION WILL REQUIRE A BOND OF INDEMNITY AS A CONDITION TO THE ISSUANCE OF A
REPLACEMENT CERTIFICATE.

The following abbreviations, when used in the inscription on the face of this
certificate, shall be construed as though they were written out in full
according to applicable laws or regulations:

TEN COM   -    as tenants in common
TEN ENT   -    as tenants by the entireties
JT TEN    -    as joint tenants with right of
               survivorship and not as tenants
               in common
     
<PAGE>

UNIF GIFT MIN ACT........................Custodian........................
                 (Cust)                                    (Minor)
                 under Uniform Gifts to Minors Act  
                ..........................................................
                                                (State)

Additional abbreviations may also be used though not in the above list.

    FOR VALUE RECEIVED,__________________ hereby sell, assign and transfer 

unto _____________________________________________________________________
                        PLEASE INSERT SOCIAL SECURITY
                   OR OTHER IDENTIFYING NUMBER OF ASSIGNEE
                                                                              
                                                                              
     _____________________________________________________________________
                (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS,
                      INCLUDING ZIP CODE, OF ASSIGNEE)
                                                       
                                                                               
     ___________________________________ Units represented by the within 
Certificate and do hereby irrevocably constitute and appoint
                                                                               

     _____________________________________________________________________

Attorney to transfer the said units on the books of the within named Corporation
with full power of substitution in the premises.

Dated __________________

                                       ___________________
                                       Signature

                                       ___________________
                                       Signature

                                       NOTICE:   The signature(s) to this 
                                       assignment must correspond with the 
                                       name(s) as written upon the face of 
                                       the Certificate in every particular, 
                                       without alteration or enlargement or 
                                       any change whatever.  


Signature(s) Guaranteed 

By__________________________

THE SIGNATURE(S) MUST BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION (BANKS,
STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS AND CREDIT UNIONS WITH MEMBERSHIP IN
AN APPROVED SIGNATURE GUARANTEE MEDALLION PROGRAM), PURSUANT TO S.E.C. RULE
17Ad-15.

<PAGE>

                             SPECIMEN CERTIFICATE

                             CALLABLE COMMON STOCK


The securities of Spiros Development Corporation II, Inc., a Delaware company
(the "Company") evidenced hereby are subject to an option of the holder of a
majority of the Special Common Stock of the Company, as described in the Amended
and Restated Certificate of Incorporation of the Company, to purchase such
securities at an agreed upon price, exercisable by notice given at any time
beginning on the closing date of the offering of the Callable Common Stock, par
value $0.001 per share (the "Callable Common Stock"), of Spiros Development
Corporation II, Inc. and the warrants (the "Warrants") to purchase common shares
of Dura Pharmaceuticals, Inc. ("Dura") which comprise the Units, (the "Unit
Offering") and ending on the earlier of (i) December 31, 2002, (ii) the 90th day
after the date the Company provides such holder with quarterly financial
statements of the Company showing cash or cash equivalents of less than
$5,000,000 or (iii) the date of termination by the Company of that certain
Technology License Agreement, Development Agreement or Manufacturing and
Marketing Agreement dated on or about December 22, 1997.  Copies of the
Amended and Restated Certificate of Incorporation of the Company are available
at the offices of the Company, 7475 Lusk Boulevard, San Diego, California
92121, Attention:  Mitchell R. Woodbury and will be furnished to any shareholder
of the Company on request and without cost.

         Until December 31, 1999 or such earlier date as the Purchase Option is
exercised or expires unexercised (the "Separation Date"), the shares of Callable
Common Stock represented by this Certificate may be traded, exchanged, or
otherwise transferred only together with the Warrant issued herewith.  The
holder hereof may, but need not, submit this Certificate for the removal of this
legend after the Separation Date.


                       SPIROS DEVELOPMENT CORPORATION II, INC.
                 Incorporated Under The Laws of the State of Delaware

                                CALLABLE COMMON STOCK

                 FULLY PAID AND NON-ASSESSABLE CALLABLE COMMON STOCK,
                             PAR VALUE OF $.001 PER SHARE
                      OF SPIROS DEVELOPMENT CORPORATION II, INC.

                                   CUSIP 848936100
                         See Reverse For Certain Definitions


<PAGE>

THIS CERTIFIES that

is the owner of           Callable Common Stock of

SPIROS DEVELOPMENT CORPORATION II, INC. (the "Company"), transferable on the
books of the Company by the holder hereof, in person or by duly authorized
attorney, upon surrender of this Certificate properly endorsed.  This
certificate and the shares represented hereby are subject to the laws of
Delaware, and to the Amended and Restated Certificate of Incorporation of the
Company as now or hereafter amended (copies of which are on file at the offices
of the Company and the Transfer Agent), which are made a part hereof with the
same force and effect as if they were set forth herein, to all of which the
holder, by acceptance hereof, assents.  This certificate is not valid unless
countersigned by the Transfer Agent and registered by the Registrar.

         IN WITNESS WHEREOF, the Company has caused the facsimile signatures of
its duly authorized officers and the facsimile of its corporate seal to be
hereunto affixed.

Dated:


Countersigned and Registered:


Transfer Agent and Registrar


By: ____________________
    Name:
    Title:


                        Authorized Officer       Authorized Officer


<PAGE>

            [FORM OF REVERSE OF SPIROS DEVELOPMENT CORPORATION II, INC.'S
                                CALLABLE COMMON STOCK]

                       SPIROS DEVELOPMENT CORPORATION II, INC.

         The Company will furnish without charge to each shareholder who so
requests a copy of the powers, designations, preferences and relative,
participating, optional or other special rights of each class of shares of the
Company or series thereof, and the qualifications, limitations or restrictions
of such preferences and/or rights.


The following abbreviations, when used in the inscription on the face of this
certificate, shall be construed as though they were written out in full
according to applicable laws or regulations:

TEN COM  -  as tenants in common

TEN ENT  -  as tenants by the entireties

JT TEN   -  as joint tenants with right of survivorship and not as tenants in
            common

UNIF GIFT MIN ACT...............Custodian..............................
                (cust)                       (Minor)
                under Uniform Gifts to Minors Act
               ....................................................
                                             (State)

Additional abbreviations may also be used though not in the above list.


         For Value Received, __________________ hereby sells, assigns and
transfers unto


Please insert Social Security
or other identifying number
of assignee


<PAGE>

                      Please print or typewrite name and address
                        including postal zip code of assignee




                                                                          Shares

represented by the within Certificate, and do hereby irrevocably constitute and
appoint


attorney, to transfer the said same on the books of the within named Company,
with full power of substitution in the premises.

Dated:


                                       Signature



                                       Signature

                             Notice:  The signature to this assignment must
                             correspond with the name as written upon the face
                             of the Certificate, in every particular, without
                             alteration or enlargement, or any change whatever.

In presence of:


<PAGE>

Important:              All signatures must be guaranteed by a firm which is a
                        financial institution and a member of the Securities
                        Transfer Agent's medallion Program ("STAMP"), the Stock
                        Exchange Medallion Program ("SEMP") or the New York
                        Stock Exchange, Inc. Medallion Signature Program
                        ("MSP").


Signature Guarantee:
                        Name of Firm


                        Authorized Signature


                        Name of Authorized Signatory
                        (Please print)


                        Address of Firm



                        Area Code and Telephone Number of Firm

<PAGE>

                              SPECIMEN CERTIFICATE

                              SPECIAL COMMON STOCK


The Special Common Stock, par value $1.00 of Spiros Development Corporation 
II, Inc., a Delaware company (the "Company"), evidenced hereby entitles the 
holders of a majority of the shares of such Special Common Stock to purchase 
all, but not less than all, of the outstanding shares of the Company's 
Callable Common Stock, par value $0.001 per share (the "Callable Common 
Stock") exercisable by notice given at any time beginning on the closing 
date of the offering of the Units, each Unit comprised of one share of 
Callable Common Stock and one warrant to purchase one-fourth of one share of 
the common stock of Dura Pharmaceuticals, Inc. and ending on the earlier of 
(i) December 31, 2002, (ii) the 90th day after the date the Company provides 
such holder with quarterly financial statements of the Company showing cash 
or cash equivalents of less than $5,000,000 or (iii) the date of termination 
by the Company of that certain Technology License Agreement, Development 
Agreement or Manufacturing and Marketing Agreement dated on or about 
December 22, 1997, all as described in the Amended and Restated 
Certificate of Incorporation of the Company. Copies of the Amended and 
Restated Certificate of Incorporation of the Company are available at the 
offices of the Company, 7475 Lusk Boulevard, San Diego, California 92121, 
Attention:  Mitchell R. Woodbury and will be furnished to any stockholder of 
the Company on request and without cost.



                       SPIROS DEVELOPMENT CORPORATION II, INC.
                 Incorporated Under The Laws of the State of Delaware

                                 SPECIAL COMMON STOCK

                 FULLY PAID AND NON-ASSESSABLE CALLABLE COMMON STOCK,
                             PAR VALUE OF $1.00 PER SHARE
                      OF SPIROS DEVELOPMENT CORPORATION II, INC.

Certificate No. S-1

                         See Reverse For Certain Definitions


<PAGE>

THIS CERTIFIES that Dura Pharmaceuticals, Inc.

is the owner of 1,000 Shares of Special Common Stock of

SPIROS DEVELOPMENT CORPORATION II, INC. (the "Company"), transferable on the
books of the Company by the holder hereof, in person or by duly authorized
attorney, upon surrender of this certificate properly endorsed.  This
certificate and the shares represented hereby are subject to the laws of
Delaware, and to the Amended and Restated Certificate of Incorporation of the
Company as now or hereafter amended (copies of which are on file at the offices
of the Company and the Transfer Agent), which are made a part hereof with the
same force and effect as if they were set forth herein, to all of which the
holder, by acceptance hereof, assents.  This certificate is not valid unless
countersigned by the Transfer Agent and registered by the Registrar.

         IN WITNESS WHEREOF, the Company has caused the facsimile signatures of
its duly authorized officers and the facsimile of its corporate seal to be
hereunto affixed.

Dated:  December 22, 1997


Countersigned and Registered:


    /s/ Cam L. Garner, President        /s/ Mitchell R. Woodbury, Secretary
    ----------------------------        -----------------------------------
    Authorized Officer                  Authorized Officer


<PAGE>

                [REVERSE OF SPIROS DEVELOPMENT CORPORATION II, INC.'S
                                SPECIAL COMMON STOCK]

                       SPIROS DEVELOPMENT CORPORATION II, INC.

The securities represented hereby have not been registered under the 
Securities Act of 1933, as amended (the "Act"), and may not be offered, sold 
or otherwise transferred, pledged or hypothecated in the absence of a 
registration statement in effect with respect to such securities, or delivery 
of an opinion of counsel in form and substance satisfactory to the issuer of 
these securities that such offer, sale or transfer, pledge or hypothecation 
is in compliance with the Act.

         The Company will furnish without charge to each stockholder who so
requests a copy of the powers, designations, preferences and relative,
participating, optional or other special rights of each class of shares of the
Company or series thereof, and the qualifications, limitations or restrictions
of such preferences and/or rights.


The following abbreviations, when used in the inscription on the face of this
certificate, shall be construed as though they were written out in full
according to applicable laws or regulations:

TEN COM  -  as tenants in common

TEN ENT  -  as tenants by the entireties

JT TEN   -  as joint tenants with right of survivorship and not as tenants in
            common

UNIF GIFT MIN ACT...............Custodian..............................
                (cust)                       (Minor)
                under Uniform Gifts to Minors Act
                ....................................................
                                             (State)

Additional abbreviations may also be used though not in the above list.


    For Value Received, __________________ hereby sells, assigns and transfers


unto   ______________________________________________________________________
                            (Please insert Social Security
                       or other identifying number of assignee)


      ______________________________________________________________________
                      Please print or typewrite name and address
                        including postal zip code of assignee


<PAGE>

    ____________________________________________ Shares of Special Common Stock

represented by the within certificate, and do hereby irrevocably constitute and
appoint


    __________________________________________________________________

attorney, to transfer the said same on the books of the within named Company,
with full power of substitution in the premises.

Dated:  __________________________

                                       _______________________
                                       Signature


                                       _______________________
                                       Signature

                                       Notice:  The signature to this
                                       assignment must correspond with the name
                                       as written upon the face of the
                                       Certificate, in every particular,
                                       without alteration or enlargement, or
                                       any change whatever.


In presence of:  __________________________


<PAGE>

Important:              All signatures must be guaranteed by a firm which is a
                        financial institution and a member of the Securities
                        Transfer Agent's medallion Program ("STAMP"), the Stock
                        Exchange Medallion Program ("SEMP") or the New York
                        Stock Exchange, Inc. Medallion Signature Program
                        ("MSP").


Signature Guarantee:    ___________________________________
                        Name of Firm


                        ___________________________________
                        Authorized Signature


                        ___________________________________
                        Name of Authorized Signatory
                        (Please print)


                        ___________________________________
                        Address of Firm


                        ___________________________________
                        Area Code and Telephone Number of Firm

<PAGE>


                          TECHNOLOGY LICENSE AGREEMENT



     This TECHNOLOGY LICENSE AGREEMENT (the "Agreement") is made as of
December 22, 1997, by and among DURA PHARMACEUTICALS, INC., a Delaware
corporation ("DURA"), DURA DELIVERY SYSTEMS, INC., a Delaware corporation
("DDSI"), SPIROS DEVELOPMENT CORPORATION, a Delaware corporation ("Spiros
Corp."), and SPIROS DEVELOPMENT CORPORATION II, INC., a Delaware corporation
("Spiros Corp. II").

                                    RECITALS

     WHEREAS, DURA and Spiros Corp. II are parties to the Development Agreement,
the Manufacturing and Marketing Agreement, and the Albuterol and Product Option
Agreement (all capitalized terms shall have the respective meanings set forth in
Section 1 hereof).

     WHEREAS, DURA has the Purchase Option to acquire all of the Spiros Corp. II
Common Stock.

     WHEREAS, DURA, DDSI and/or Spiros Corp. are the owners or licensees of the
Core Technology and of certain rights relating to the Spiros Products and
certain intellectual property rights relating thereto.

     WHEREAS, DURA, DDSI and Spiros Corp. are willing to grant to Spiros Corp.
II and Spiros Corp. II desires to acquire from DURA, DDSI and Spiros Corp., a
license to the Core Technology and the Spiros Products for the purpose of
allowing Spiros Corp. II to perform research, develop and commercialize the
Spiros Products.

     WHEREAS, pursuant to the Development Agreement, Spiros Corp. II has engaged
DURA to employ the intellectual property rights and technology licensed
hereunder in conducting the Development and commercialization of Spiros
Products.

     WHEREAS, in the course of researching and developing the Program
Technology, DURA or Spiros Corp. II may develop certain inventions, processes or
know-how, or DURA may obtain on behalf of Spiros Corp. II rights to certain
additional technology or patents or other proprietary rights useful to other
than just the Spiros Products.

     WHEREAS, DURA desires to acquire, and Spiros Corp. II is willing to grant
to DURA, an exclusive worldwide license or sublicense to make, use, market and
sell such developments, technology or rights other than with respect to Spiros
Products.

     NOW, THEREFORE, in consideration of the mutual covenants set forth herein
and for other good and valuable consideration, the 

<PAGE>

receipt and sufficiency of which are hereby acknowledged, and in order to induce
DURA to enter into the Agreements, DURA, DDSI, Spiros Corp. and Spiros Corp. II
hereby agree as follows:

1.   DEFINITIONS.

     1.1  DEFINITIONS.  All capitalized terms used herein and not otherwise
defined shall have the respective meanings, to the extent such terms are used
herein, set forth in SCHEDULE 1.1 attached hereto, which is incorporated by this
reference as though fully set forth herein.

     1.2  SINGULAR AND PLURAL.  Singular and plural forms, as the case may be,
of terms defined herein shall have correlative meanings.

2.   GRANT OF LICENSES. 

     2.1  GRANT OF EXCLUSIVE LICENSES TO SPIROS CORP. II; RIGHT TO SUBLICENSE.

          2.1.1   DURA GRANT.  Subject to the terms and conditions of this
Agreement, DURA hereby grants to Spiros Corp. II an exclusive (against DURA and
all other Persons) perpetual, worldwide right and license, terminable only as
set forth herein, to employ the DURA Core Technology to research, develop, make,
have made, use, sell, have sold and import the Spiros Products (except with
respect to beclomethasone in Japan, Hong Kong, Singapore, the Republic of China,
Taiwan, the Republic of Korea and the People's Republic of China).

          2.1.2   DDSI GRANT.  Subject to the terms and conditions of this
Agreement, DDSI hereby grants to Spiros Corp. II an exclusive (against DDSI and
all other Persons) perpetual, worldwide right and license, terminable only as
set forth herein, to employ the DDSI Core Technology to research, develop, make,
have made, use, sell, have sold and import the Spiros Products (except with
respect to beclomethasone in Japan, Hong Kong, Singapore, the Republic of China,
Taiwan, the Republic of Korea and the People's Republic of China). 

          2.1.3   SPIROS CORP. GRANT.  Subject to the terms and conditions of
this Agreement, Spiros Corp. hereby grants to Spiros Corp. II an exclusive
(against Spiros Corp. and all other Persons) perpetual, worldwide right and
license, terminable only as set forth herein, to employ the Spiros Core
Technology to research, develop, make, have made, use, sell, have sold and
import the Spiros Products (except with respect to beclomethasone in Japan, Hong
Kong, Singapore, the Republic of China, Taiwan, the Republic of Korea and the
People's Republic of China).

     2.2  THIRD PARTY LICENSES TO DURA OR ANY OF ITS AFFILIATES.  With respect
to the rights of third parties that may be obtained by DURA after the date
hereof, and which are necessary or useful to the Development under the
Development Agreement or the 


                                      - 2 -

<PAGE>

commercialization of the Spiros Products under the Manufacturing and 
Marketing Agreement, DURA shall use commercially reasonable efforts to secure 
such rights and the right to sublicense such rights to Spiros Corp. II and 
shall sublicense such rights to Spiros Corp. II whenever possible; PROVIDED 
that Spiros Corp. II shall not be obligated to accept any grant of rights or 
assume any obligations hereunder without its prior written consent.  If 
Spiros Corp. II desires to obtain any such rights licensed to DURA or any of 
its Affiliates pursuant to an agreement with any Person other than Spiros 
Corp. II (a "Third Party Agreement"), the existence of which DURA shall 
promptly inform Spiros Corp. II, Spiros Corp. II and DURA agree to negotiate 
in good faith regarding the allocation between DURA or any of its Affiliates 
and Spiros Corp. II of the royalty, license fee, milestone fee or other 
payments payable to the third party and the assumption of any obligations 
applicable to such license, if any.  Spiros Corp. II shall bear the cost of 
obtaining any such rights and shall assume such obligations only in 
proportion to its and its sublicensees' (other than DURA's and/or any of its 
Affiliates) use of such rights.  Any sublicense granted to Spiros Corp. II 
hereunder shall be limited to the rights that DURA and/or any of its 
Affiliates has a right to grant under any such Third Party Agreement and to 
any obligations under any such Third Party Agreement, and to any obligations 
assumed by DURA and/or any of its Affiliates in consideration of the grant or 
assignment of such rights to DURA which are to be sublicensed to Spiros Corp. 
II.  No party shall take any action, or fail to take any action within its 
control, that would constitute or give rise to a breach or other violation by 
DURA or any of its Affiliates of any such Third Party Agreement.  The parties 
agree that no future licensing fees are required to be paid by Spiros Corp. 
II during the term of this Agreement as consideration for the licenses and 
sublicenses granted to Spiros Corp. II hereunder, except as set forth in this 
Section 2.2.

     2.3  SPIROS CORP. II SUBLICENSES AND LICENSES TO DURA.

          2.3.1     DEVELOPMENT LICENSE.  Spiros Corp. II hereby grants DURA an
exclusive, even as to Spiros Corp. II and all other Persons, royalty-free
license to employ and engage in any and all uses of the Program Technology to
conduct Development, subject to the terms and conditions of and to the extent
necessary to perform its obligations under the Development Agreement.  The
rights granted under this Section 2.3.1 may be further sublicensed by DURA only
to its Affiliates or as permitted under of the Development Agreement (and, in
such a case, solely to the extent necessary to perform any subcontracting
services thereunder) or as otherwise agreed to in writing by Spiros Corp. II. 

          2.3.2     COMMERCIALIZATION LICENSE.  Spiros Corp. II hereby grants
DURA an exclusive, even as to Spiros Corp. II and all other Persons, worldwide
license to use the Program Technology to make, have made, use, sell, supply and
import Spiros Products subject to the terms and conditions of and to the extent
necessary to perform its obligations under the 


                                      - 3 -

<PAGE>

Manufacturing and Marketing Agreement.  The rights granted under this
Section 2.3.2 may be further sublicensed by DURA only to its Affiliates or as
permitted under the Manufacturing and Marketing Agreement (and, in such a case,
solely to the extent necessary to perform any subcontracting services
thereunder) or as otherwise agreed to in writing by Spiros Corp. II. 

          2.3.3     ALBUTEROL PRODUCT LICENSE.  Spiros Corp. II hereby grants
DURA effective upon the exercise of the Albuterol Option, an exclusive, royalty-
free, irrevocable, perpetual, worldwide license to use the Program Technology to
develop, make, have made, use, sell, have sold, supply and import the Albuterol
Product.  The license granted hereunder shall include the right to grant
sublicenses with respect to the Program Technology licensed under this Section
2.3.3 for use with the Albuterol Product.

          2.3.4     PRODUCT OPTION LICENSE.  Spiros Corp. II hereby grants DURA
effective upon the exercise of the Product Option, an exclusive, royalty-free,
irrevocable, perpetual, worldwide license to use the Program Technology to
develop, have developed, make, have made, use, sell, have sold, supply and
import the Option Product.  The license granted hereunder shall include the
right to grant sublicenses with respect to the Program Technology licensed under
this Section 2.3.4 for use with the Option Product.  

          2.3.5     ADDITIONAL LICENSE.  Spiros Corp. II hereby grants DURA an
exclusive, royalty-free, irrevocable, perpetual, worldwide license to use the
Program Technology, including technology relating to enhancements to Spiros
technology or any next generation inhaler system in which Spiros Corp. II has
rights, to develop, have developed, make, have made, use, sell, have sold,
supply and import any products other than the Spiros Products.

          2.3.6     OTHER LICENSES.  The foregoing licenses are granted in
addition to, and not in substitution for, any other license granted to DURA,
whether pursuant to this Agreement or otherwise.

     2.4  RESTRICTIONS UPON USE OF PROGRAM TECHNOLOGY.  Except as provided in
the Agreements or by the prior written consent of DURA, Spiros Corp. II shall
not, directly or indirectly, prior to the expiration or termination (other than
by exercise) of the Purchase Option, (a) license, sublicense, encumber, pledge,
sell, assign or otherwise transfer to any Person any rights under the Program
Technology, (b) make, have made, use or sell any of the Program Technology for
any purpose whatsoever, or (c) authorize, cause or assist in any way any other
Person to do any of the foregoing.  Following the expiration or termination
(other than by exercise) of the Purchase Option, the foregoing limitations shall
cease to be applicable and Spiros Corp. II shall have, without limitation, the
right to sublicense the Program Technology for use with the Spiros Products.


                                      - 4 -

<PAGE>

     2.5  ADJUSTMENT OF LICENSES.  The licenses granted in Sections 2.1 and 2.3
hereunder shall be subject to adjustment (a) upon the Albuterol Option Closing
Date, so as to exclude any rights to the Albuterol Program Assets from the
licenses granted therein, and (b) upon the Product Option Closing Date, so as to
exclude any rights to Spiros Product Program Assets from the license granted
therein.

3.   REPRESENTATIONS, WARRANTIES AND COVENANTS.

     3.1  REPRESENTATIONS, WARRANTIES AND COVENANTS OF DURA.  DURA represents,
warrants and covenants to Spiros Corp. II as follows:

          3.1.1   ORGANIZATION OF DURA.  DURA is a corporation duly organized,
validly existing and in good standing under the laws of the State of Delaware
with full corporate power and authority adequate for executing and delivering
and performing its obligations under this Agreement;

          3.1.2   ORGANIZATION OF DDSI.  DDSI is a corporation duly organized,
validly existing and in good standing under the laws of the State of Delaware
with full corporate power and authority adequate for executing and delivering
and performing its obligations under this Agreement;

          3.1.3   ORGANIZATION OF SPIROS CORP..  Spiros Corp. is a corporation
duly organized, validly existing and in good standing under the laws of the
State of Delaware with full corporate power and authority adequate for executing
and delivering and performing its obligations under this Agreement.

          3.1.4   AUTHORIZATION.  The execution, delivery and performance of
this Agreement have been duly authorized by all necessary corporate action on
the part of DURA, DDSI and Spiros Corp. and this Agreement shall constitute a
legal, valid and binding obligation of each of DURA, DDSI and Spiros Corp.,
enforceable against DURA, DDSI and Spiros Corp. in accordance with its terms,
subject to laws of general application relating to bankruptcy, insolvency and
the relief of debtors; 

          3.1.5   COMPLIANCE WITH OTHER INSTRUMENTS.  The execution, delivery
and performance of this Agreement do not and will not conflict with or
contravene any provision of the charter documents or by-laws of each of DURA,
DDSI and Spiros Corp. or any material agreement, document, instrument, indenture
or other obligation of DURA, DDSI or Spiros Corp.;

          3.1.6   OTHER AGREEMENTS.  None of DURA, DDSI or Spiros Corp. shall
enter into any agreement, make any commitment, take any action or fail to take
any action that would contravene any material provision of, or materially
derogate or restrict any of the rights and licenses granted or assigned to
Spiros Corp. II under, this Agreement and each of DURA, DDSI and Spiros Corp. 


                                      - 5 -

<PAGE>

agree to abide and be bound by the terms of any license agreement to which they
are a party, any of the rights to which have been or will be sublicensed or
assigned to Spiros Corp. II; 

          3.1.7   INTELLECTUAL PROPERTY RIGHTS.  To the best of its 
knowledge, each of DURA, DDSI and Spiros Corp. has sufficient legal and/or 
beneficial title and ownership to grant the licenses to the DURA Core 
Technology, the DDSI Core Technology and the Spiros Corp. Core Technology, 
respectively, and the other intellectual property rights provided in Section 
2 above.  None of DURA, DDSI or Spiros Corp. is aware of and has not received 
any communications alleging that it has violated, or that Spiros Corp. II by 
practicing the Core Technology as contemplated in the Agreements would 
violate, any intellectual property rights of any third party.  Except for the 
1933 Royalty Agreement, there are no outstanding options, licenses or 
agreements of any kind between DURA, DDSI or Spiros Corp. and any third party 
relating to the research, development, manufacture, use or sale of the Spiros 
Products.  To the best of its knowledge, there is no material unauthorized 
use, infringement or misappropriation of any of the Core Technology.  DURA, 
DDSI and Spiros Corp. are not aware of, nor have they received any 
communications challenging the ownership, validity or effectiveness of the 
Core Technology. 

          3.1.8   VALIDITY.  None of DURA, DDSI or Spiros Corp. is aware of any
action, suit or inquiry or investigation instituted by any federal, state, local
or foreign governmental agency or instrumentality which questions or threatens
the validity of the Agreements.

     3.2  REPRESENTATIONS, WARRANTIES AND COVENANTS OF SPIROS CORP. II.  Spiros
Corp. II represents, warrants and covenants to DURA, DDSI and Spiros Corp. as
follows:

          3.2.1   ORGANIZATION.  Spiros Corp. II is a corporation duly
organized, validly existing and in good standing under the laws of State of
Delaware with full corporate power and authority adequate for executing and
delivering and performing its obligations under this Agreement;

          3.2.2   AUTHORIZATION.  The execution, delivery and performance of
this Agreement have been duly authorized by all necessary corporate action on
the part of Spiros Corp. II, and this Agreement shall constitute a legal, valid
and binding obligation of Spiros Corp. II, enforceable against Spiros Corp. II
in accordance with its terms, subject to laws of general application relating to
bankruptcy, insolvency and the relief of debtors; 
 
          3.2.3   COMPLIANCE WITH OTHER INSTRUMENTS.  The execution, delivery
and performance of this Agreement do not and will not conflict with or
contravene any provision of the charter documents or by-laws of Spiros Corp. II
or any material agreement, document, instrument, indenture or other obligation
of Spiros Corp. II; 


                                      - 6 -

<PAGE>

          3.2.4   OTHER AGREEMENTS.  Spiros Corp. II shall not enter into any
agreement, make any commitment, take any action or fail to take any action that
would contravene any material provisions of, or materially derogate or restrict
any of the rights or licenses granted to DURA under, this Agreement;

          3.2.5   SUBLICENSES.  Spiros Corp. II agrees to abide and be bound by
the terms of the sublicenses granted to it in accordance with the terms of this
Agreement by DURA, DDSI and/or Spiros Corp. under any Third Party Agreement or
under any agreement with a third party;

          3.2.6   NON-COMPETITION.  Spiros Corp. II shall not, during the 
term of this Agreement, without the prior written consent of DURA, solicit 
the employment of any person, in any capacity, who, at any time during the 
term of this Agreement, shall have been an officer, director, employee or 
agent of DURA or any of its Affiliates, except for the officers of Spiros 
Corp. II on the date hereof; and

          3.2.7   VALIDITY.  Spiros Corp. II is aware of no action, suit or
inquiry or investigation instituted by any federal, state, local or foreign
governmental agency or instrumentality which questions or threatens the validity
of the Agreements.

4.   DISCLOSURE AND USE OF TECHNOLOGY AND RIGHTS.

     4.1  TECHNOLOGY TRANSFER.

          4.1.1   PRIOR TO EXPIRATION OR TERMINATION OF PURCHASE OPTION.  At any
time prior to the expiration or termination (other than by exercise) of the
Purchase Option and upon request by Spiros Corp. II, each of DURA, DDSI and
Spiros Corp. shall, within a reasonable time thereafter, provide access to
Spiros Corp. II to all physical manifestations of the Program Technology which
they control.

          4.1.2   AFTER EXPIRATION OR TERMINATION OF OPTION.  After expiration
or termination (other than by exercise) of the Purchase Option, DURA shall,
except as provided otherwise in any of the Agreements, within thirty (30) days
of a written request by Spiros Corp. II, provide to Spiros Corp. II or a
sublicensee designated by Spiros Corp. II, reasonably sufficient quantities of
previously manufactured quantities of Spiros Products and all physical
manifestations of the Program Technology, including, without limitation, copies
of all laboratory notebooks, designs, specifications, formulas, procedures,
clinical and pre-clinical data and other information, all to the extent that
such Spiros Products, or Program Technology were developed prior to the time of
such required delivery.  Spiros Corp. II shall pay all costs of shipping,
packaging, copying and similar or related costs in connection therewith,
provided such costs have not been previously paid by Spiros Corp. II hereunder
or under the 


                                      - 7 -

<PAGE>

Development Agreement.

          4.1.3   TECHNICAL ASSISTANCE AFTER EXPIRATION OR TERMINATION OF
PURCHASE OPTION.  For a period of one (1) year after expiration or termination
(other than by exercise) of the Purchase Option, each of DURA, DDSI and Spiros
Corp. shall provide to Spiros Corp. II, or a sublicensee designated by Spiros
Corp. II, at Spiros Corp. II's or such permitted sublicensee's sole option and
expense, reasonable technical assistance and instruction in understanding,
interpreting and applying the Program Technology solely for the purposes of
further developing the Program Technology and developing and commercializing
Spiros Products.  Each of DURA, DDSI and Spiros Corp. shall make their
respective employees directly involved in the Development of the Program
Technology prior to the expiration or termination (other than by exercise) of
the Purchase Option, reasonably available for consultation by telephone, or in
person at their respective offices at reasonable cost, in connection with such
assistance and instruction, all at the sole expense of Spiros Corp. II or such
sublicensee.  The obligations set forth in this Section 4.1.3 shall not include
any obligation to disclose matters unrelated to the application of the Program
Technology to the Spiros Products, matters with respect to the Albuterol Product
(following the exercise of the Albuterol Option) or matters with respect to the
Option Product (following the exercise of the Product Option).

     4.2  PATENTS.

          4.2.1   RIGHTS PRIOR TO EXPIRATION OR TERMINATION OF PURCHASE 
OPTION. Except as set forth below, until the expiration or termination (other 
than by exercise) of the Purchase Option, DURA shall, at Spiros Corp. II's 
sole expense, direct and cause appropriate patent applications to be 
prepared, filed and prosecuted in all relevant territories, in a timely 
fashion, with respect to any inventions included in the Program Technology 
whether arising out of inventions made solely by DURA employees or 
consultants, inventions made solely by DDSI employees or consultants, 
inventions made solely by Spiros Corp. employees or consultants, inventions 
made solely by Spiros Corp. II employees or consultants or inventions made 
jointly by any of the parties' employees or consultants. DURA and Spiros 
Corp. II shall discuss and evaluate with each other such discoveries and 
inventions and shall confer regarding the advisability of filing patent 
applications to cover those discoveries and inventions, including the 
countries in which such patent applications should be filed.  DURA shall 
cause any patents issuing thereon to be maintained and enforced that DURA and 
Spiros Corp. II believe, in their commercially reasonable judgment, are 
patentable and commercially and technically significant to Spiros Corp. II.  
With respect to the Developed Technology that has substantial application to 
Spiros Products, as well as to products other than the Spiros Products, the 
expenses of preparing, prosecuting and maintaining such patents shall be 
reasonably allocated between DURA and Spiros Corp. II by their mutual 
agreement.

                                      - 8 -

<PAGE>

          4.2.2   RIGHTS AFTER EXPIRATION OR TERMINATION OF PURCHASE OPTION. 
After the expiration or termination of the Purchase Option (other than by
exercise), Spiros Corp. II shall have the exclusive right, at its sole expense,
to prepare and prosecute, in its name, patent applications, and to maintain
patents issued with respect to the Program Technology.  In the event that Spiros
Corp. II declines to prepare, prosecute or maintain any such patent application
or patent, Spiros Corp. II shall give DURA no less than sixty (60) days' prior
written notice of such decision but in all events at least as much time so as to
allow DURA to take action to forestall a loss of novelty or a statutory bar to
patentability.  Following such written notice, and in order to protect its
rights, DURA shall have the right in its sole discretion and at its sole
expense, to undertake the preparation, prosecution or maintenance of any such
patent application or patent issued thereon with respect to the DURA Core
Technology, the DDSI Core Technology and the Spiros Core Technology. 
Enforcement rights upon the expiration or termination (other than by exercise)
of the Purchase Option are governed by Section 5.2.2 hereunder.

          4.2.3   COOPERATION.  Each party agrees to cause each of its employees
and agents to take all actions and to execute, acknowledge and deliver all
instruments or agreements reasonably requested by the other party, and necessary
for the perfection, maintenance, enforcement or defense of that party's rights
as set forth above. 

     4.3  CONFIDENTIAL INFORMATION.  Any party receiving Confidential
Information shall maintain the confidential and proprietary status of such
Confidential Information, keep such Confidential Information and each part
thereof within its possession or under its control sufficient to prevent any
activity with respect to the Confidential Information that is not specifically
authorized by this Agreement, use all commercially reasonable efforts to prevent
the disclosure of any Confidential Information to any other Person, and use
commercially reasonable efforts to ensure that such Confidential Information is
used only for those purposes specifically authorized herein; PROVIDED, HOWEVER,
that such restriction shall not apply to any Confidential Information that is
(a) independently developed by the receiving party outside the scope of this
Agreement or the Development Agreement (PROVIDED, HOWEVER, that such restriction
shall apply to any technology licensed by DURA, DDSI or Spiros Corp. to Spiros
Corp. II under this Agreement), (b) in the public domain at the time of its
receipt or thereafter becomes part of the public domain through no fault of the
receiving party, (c) received without an obligation of confidentiality from a
third party having the right to disclose such information, (d) released from the
restrictions of this Section 4.3 by the express written consent of the
disclosing party, (e) disclosed to any permitted assignee, permitted sublicensee
or permitted subcontractor of DURA, DDSI, Spiros Corp. or Spiros Corp. II under
the Agreements (if such assignee, sublicensee or 


                                      - 9 -

<PAGE>

subcontractor is subject to the provisions of this Section 4.3 or 
substantially similar provisions) or (f) required by law, statute, rule or 
court order to be disclosed (the disclosing party shall, however, use 
commercially reasonable efforts to obtain confidential treatment of any such 
disclosure).  The obligations set forth in this Section 4.3 shall survive for 
a period of ten (10) years from the expiration or termination (other than by 
exercise) of the Purchase Option. Without limiting the generality of the 
foregoing, DURA, DDSI, Spiros Corp. and Spiros Corp. II each shall use 
commercially reasonable efforts to obtain, if not already in place, 
confidentiality agreements from their respective employees and agents, 
similar in scope to this Section 4.3, to protect the Confidential Information.

     4.4  PERMITTED DISCLOSURES.  Notwithstanding the provisions of Section 4.3
hereof, DURA, DDSI, Spiros Corp. and Spiros Corp. II (and their permitted
sublicensees) may, to the extent necessary, disclose and use Confidential
Information, consistent with the rights of DURA, DDSI, Spiros Corp. and Spiros
Corp. II otherwise granted hereunder (a) for the purpose of securing
institutional or government approval to clinically test or market any Spiros
Product, (b) for the purpose of securing patent protection for an invention
within the scope of the Program Technology, (c) in the case of Spiros Corp. II,
following expiration or termination (other than by exercise) of the Purchase
Option, to the extent necessary or useful in the development or
commercialization of any Spiros Products or (d) in the case of DURA, following
exercise of the Albuterol Option or the Product Option, to the extent necessary
or useful in the development or commercialization of the Albuterol Product or
the Option Product, respectively; PROVIDED, that the disclosing party obtains an
agreement from any Person to whom such Confidential Information is disclosed to
preserve the confidentiality thereof upon terms reasonably equivalent to those
set forth herein and to use such Confidential Information only for those
purposes consistent with the respective rights granted to Spiros Corp., DURA,
DDSI and Spiros Corp. II hereunder or under any of the Agreements.

5.   PATENT INFRINGEMENT.

     5.1  NOTIFICATION OF INFRINGEMENT.  Each party shall notify all other
parties of any infringement known to such party by any Person of any Patent
Rights and shall provide all other parties with the available evidence, if any,
of such infringement.


                                      - 10 -

<PAGE>

     5.2  ENFORCEMENT OF PATENT RIGHTS.  If any party has actual notice of
infringement by any Person of Patent Rights, the respective officers of DURA and
Spiros Corp. II shall confer to determine in good faith an appropriate course of
action to enforce such Patent Rights or otherwise abate the infringement
thereof, subject to the provisions of this Section 5.2.  DURA and Spiros Corp.
II shall consult with each other in the planning and execution of any action to
enforce Patent Rights.

          5.2.1   RIGHTS PRIOR TO EXPIRATION OR TERMINATION OF OPTION.  Until
the expiration or termination (other than by exercise) of the Purchase Option,
if DURA determines that enforcement of Patent Rights is appropriate, DURA shall
have the right, but not the obligation, to take appropriate action to enforce
such Patent Rights.  Any enforcement with respect to the Patent Rights shall be
at DURA's expense; PROVIDED, HOWEVER, that if DURA elects to so act with respect
to the Patent Rights, Spiros Corp. II shall have the right to participate in the
enforcement of such Patent Rights by agreeing to bear a percentage of the costs
of such enforcement in such amount as the parties shall determine.  If, within
six (6) months after notice of infringement, DURA has not commenced an action to
enforce such Patent Rights or thereafter ceases to diligently pursue such
action, Spiros Corp. II shall have the right, at its expense, to take
appropriate action to enforce such Patent Rights as its sole remedy hereunder. 
All amounts recovered in any action to enforce Patent Rights undertaken by DURA
and Spiros Corp. II, whether by judgment or settlement, shall be retained by
DURA and Spiros Corp. II pro rata according to the respective percentages of
expenses borne by them in enforcing such Patent Rights.  Neither DURA nor Spiros
Corp. II shall enter into any settlement that includes the grant of a license
under, agreement not to enforce, or any statement prejudicial to the validity or
enforceability of any Patent Rights without the consent of the other, which
consent shall not be unreasonably withheld.  Any amounts retained by Spiros
Corp. II shall not be considered Available Funds.  

          5.2.2   RIGHTS AFTER EXPIRATION OR TERMINATION OF OPTION.  After the
expiration or termination (other than by exercise) of the Purchase Option, if
Spiros Corp. II determines that enforcement of Patent Rights is appropriate,
Spiros Corp. II shall have the right, but not the obligation, to take
appropriate action to enforce such Patent Rights.  Any enforcement with respect
to the Patent Rights shall be at Spiros Corp. II's expense; PROVIDED, HOWEVER,
that if Spiros Corp. II elects to so act with respect to the Patent Rights, DURA
shall have the right to participate in the enforcement of such Patent Rights by
agreeing to bear a percentage of the costs of such enforcement in such amount as
the parties shall determine.  If, within six (6) months after notice of
infringement, Spiros Corp. II has not commenced an action to enforce such Patent
Rights or thereafter ceases to diligently pursue such action, DURA shall have
the right, at its expense, to take appropriate action to enforce such Patent
Rights as its sole remedy hereunder.  All amounts recovered in any action to
enforce Patent Rights undertaken by 


                                      - 11 -

<PAGE>

Spiros Corp. II and DURA, whether by judgment or settlement, shall be 
retained by Spiros Corp. II or DURA pro rata according to the respective 
percentages of expenses borne by them in enforcing such Patent Rights.  
Neither DURA nor Spiros Corp. II shall enter into any settlement that 
includes the grant of a license under, agreement not to enforce, or any 
statement prejudicial to the validity or enforceability of any Patent Rights 
without the consent of the other, which consent shall not be unreasonably 
withheld.

          5.2.3   COOPERATION.  Each party agrees to cause each of its employees
and agents to take all actions and to execute, acknowledge and deliver all
instruments or agreements reasonably requested by the other party, and necessary
for the perfection, maintenance, enforcement or defense of the party's rights as
set forth above.

     5.3  DISCLAIMER OF WARRANTY; CONSEQUENTIAL DAMAGES.

          5.3.1   DISCLAIMER OF WARRANTY.  Nothing in this Agreement shall be
construed as a representation made or warranty given by any party hereto that
any patents will issue based on pending applications within the Patent Rights,
or that any such Patent Rights which do issue will be valid, or that the
practice by a party hereto of any license granted hereunder, or that the use of
any Program Technology licensed hereunder, will not infringe the patent or
proprietary rights of any other Person.  Spiros Corp. II understands that the
Development shall involve technologies that have not been approved by any
regulatory authority and that none of DURA, DDSI or Spiros Corp. guarantees the
safety or usefulness of any Spiros Product.  In addition, except as expressly
set forth in Section 3 of this Agreement, DURA, DDSI, Spiros Corp. and Spiros
Corp. II acknowledge that THE PROGRAM TECHNOLOGY IS LICENSED TO Spiros Corp. II
AND SUBLICENSED TO DURA HEREUNDER AS IS, AND DURA, DDSI, SPIROS CORP. AND SPIROS
CORP. II EXPRESSLY DISCLAIM AND HEREBY WAIVE, RELEASE AND RENOUNCE ANY WARRANTY,
EXPRESS OR IMPLIED, WITH RESPECT TO SUCH PROGRAM TECHNOLOGY, INCLUDING, WITHOUT
LIMITATION, ANY WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
NONINFRINGEMENT.  Except as expressly set forth in this agreement, DURA, DDSI,
Spiros Corp. and Spiros Corp. II disclaim all warranties of any nature, express
or implied.

          5.3.2   CONSEQUENTIAL DAMAGES.  NONE OF THE PARTIES TO THIS AGREEMENT
SHALL BE ENTITLED TO RECOVER FROM ANOTHER PARTY HERETO ANY SPECIAL, INCIDENTAL,
CONSEQUENTIAL OR PUNITIVE DAMAGES.


                                      - 12 -

<PAGE>

6.   INDEMNIFICATION.  

     6.1  INDEMNIFICATION BY DURA.  DURA shall indemnify the Spiros Corp. II 
Indemnitees, pay on demand and protect, defend, save and hold harmless each 
Spiros Corp. II Indemnitee from and against any and all Claims incurred by or 
asserted against any Spiros Corp. II Indemnitee of whatever kind or nature, 
including, without limitation, any claim or liability based upon negligence, 
warranty, strict liability, violation of government regulation or 
infringement of patent or other propriety rights, arising from or occurring 
as a result of (a) any use of the Program Technology by DURA or any 
Affiliate, agent or sublicensee of DURA (other than Spiros Corp. II in 
contravention of the terms of this Agreement), (b) any of the Development or 
any other services to be performed by DURA during the term of the Agreements 
pursuant to the Agreements, including, without limitation, any workers' 
compensation claim by any DURA employee or consultant or other Person or (c) 
subject to Section 5.3.2, any breach of the Agreements by DURA, except, with 
respect to Spiros Corp. II Indemnitees, in cases in which Claims of Spiros 
Corp. II Indemnitees are based upon the gross negligence or willful 
misconduct of a Spiros Corp. II Indemnitee.  A Spiros Corp. II Indemnitee 
shall promptly notify DURA of any Claim with respect to which an Spiros Corp. 
II Indemnitee is seeking indemnification hereunder, upon becoming aware 
thereof, and permit DURA at DURA's cost to defend against such Claim and 
shall cooperate in the defense thereof.

     6.2  INDEMNIFICATION BY SPIROS CORP. II.  Spiros Corp. II shall indemnify
the DURA Indemnitees, the DDSI Indemnitees and the Spiros Corp. Indemnitees, pay
on demand and protect, defend, save and hold harmless each DURA Indemnitee, DDSI
Indemnitee or Spiros Corp. Indemnitee from and against any and all Claims
incurred by or asserted against any DURA Indemnitee, DDSI Indemnitee or Spiros
Corp. Indemnitee of whatever kind or nature, including, without limitation, any
claim or liability based upon negligence, warranty, strict liability, violation
of government regulation or infringement of patent or other propriety rights,
arising from or occurring as a result of (a) any use of the Program Technology
by Spiros Corp. II or any sublicensee of Spiros Corp. II (other than the use of
such by DURA, DDSI or Spiros Corp. whether pursuant to the Agreements or
otherwise) or (b) subject to Section 5.3.2, any breach of the Agreements by
Spiros Corp. II, except, with respect to DURA Indemnitees, in cases in which
Claims are based upon the gross negligence or willful misconduct of a DURA
Indemnitee or, except with respect to DDSI Indemnitees, in cases in which Claims
are based upon the gross negligence or willful misconduct of a DDSI Indemnitee
or, except with respect to Spiros Corp. Indemnitees, in cases in which Claims
are based upon the gross negligence or willful misconduct of a Spiros Corp.
Indemnitee.  An Indemnitee hereunder shall promptly notify Spiros Corp. II of
any Claim with respect to which such Indemnitee is seeking indemnification
hereunder, upon becoming aware thereof, and permit Spiros Corp. II at Spiros


                                      - 13 -

<PAGE>

Corp. II's cost to defend against such Claim and shall cooperate in the 
defense thereof.

     6.3  DEFENSE OF CLAIMS.  None of DURA, DDSI, Spiros Corp. or Spiros Corp.
II shall enter into, or permit, any settlement of any Claim for which
indemnification is being sought by such party hereunder without the express
written consent of each other party (or a DURA, DDSI, Spiros Corp. or Spiros
Corp. II Indemnitee, as the case may be), which consent shall not be
unreasonably withheld or delayed.  Each party may, at its option and expense,
have its own counsel participate in any proceeding which is under the direction
of another party (the "Indemnifying Party") and will cooperate with the
Indemnifying Party and its insurer in the disposition of any such matter;
PROVIDED, HOWEVER, that if the Indemnifying Party shall not defend such Claim,
the other party shall have the right to defend such Claim itself and recover
from the Indemnifying Party all reasonable attorneys' fees and expenses incurred
by it during the course of such defense.

7.   TECHNOLOGY ACCESS FEE.

     7.1  FEE.  In consideration of the license rights granted to Spiros 
Corp. II herein and in recognition of DURA's, DDSI's and Spiros Corp.'s 
expertise which they have developed over a period of years and individually, 
Spiros Corp. II shall pay DURA, DDSI and Spiros Corp. an aggregate technology 
access fee equal to the greater of (a) five percent (5%) of the Net Sales in 
a calendar year for each Spiros Product, to be paid by Spiros Corp. II fifty 
percent (50%) to DURA, twenty percent (20%) to DDSI and thirty percent 
(30%) to Spiros Corp. or (b) Two Million Dollars for all Spiros Products in 
any calendar year beginning in calendar 1998, to be paid by Spiros Corp. II 
fifty percent (50%) to DURA, twenty percent (20%) to DDSI and thirty
percent (30%) to Spiros Corp.


     7.2  TERM.  Such technology access fee obligation shall terminate on a
country-to-country basis, on the following basis:  (a) in those countries where
no patents covering such Spiros Product issue, ten (10) years following the
first commercial sale of such Spiros Product in such country; and (b) in those
countries where a patent(s) covering such Spiros Product issue, upon the
expiration of the last-to-expire patent covering the manufacture, use, import or
sale of a Spiros Product in such country.


     7.3  PAYMENT OF TECHNOLOGY ACCESS FEES.  Spiros Corp. II shall pay Five 
Hundred Thousand Dollars ($500,000) on or before the forty-fifth (45th)
day following the end of each calendar quarter, fifty percent (50%) to
DURA, twenty percent (20%) to DDSI and thirty percent (30%) to Spiros 
Corp.  Within sixty (60) days following the end of each calendar year,
Spiros Corp. II shall provide to DURA, DDSI and Spiros Corp. a formal
accounting of the Net Sales of each Spiros Product in such calendar year
(the "Accounting"), and shall calculate the aggregate sum with respect to
sales of all Spiros Products which would be due if Spiros Corp. II were
to pay DURA five percent (5%) of the Net Sales in a calendar year for
each Spiros Product (the "Net Sales Amount").  In the event that the Net
Sales Amount is less than Two Million Dollars ($2,000,000), no additional
payments shall be due and payable from Spiros Corp. II with respect to 
access to the Core Technology.  In the event that the Net Sales Amount is
greater than Two Million Dollars ($2,000,000), Spiros Corp. II shall
promptly pay, but in no event later than five (5) business days following 
delivery of the Accounting to DURA, DDSI and Spiros Corp., the difference 
between the Net Sales Amount and Two Million Dollars ($2,000,000) with
respect to access to the Core Technology, fifty percent (50%) to DURA,
twenty percent (20%) to DDSI and thirty percent (30%) to Spiros Corp. 


     7.4  PRODUCT SALES.  The Spiros Products for which such technology access
fees are payable shall be deemed to have been sold when shipped and billed to a
third party.


     7.5  PAYEE.  Such technology access fees shall be paid by Spiros Corp. II 
directly to the party entitled thereto or to such party's designee as duly named
in a written notice to Spiros Corp. II.  


     7.6  PAYMENT IN DOLLARS.  Such technology access fees shall 


                                      - 14 -

<PAGE>

be paid in United States currency.  All technology access fees accrued in 
currencies other than U.S. dollars shall be converted into U.S. dollars on 
the basis of the rate of exchange applied by Citibank, N.A., New York, as of 
the last banking day of each quarter for which such technology access fees 
become due.  

     7.7  PROHIBITED PAYMENTS.  Notwithstanding any other provision of the
Agreements, if Spiros Corp. II is prevented from paying any such technology
access fee by virtue of the statutes, laws, codes or governmental regulations of
the country from which the payment is to be made, then such technology access
fee shall be made by depositing funds in the currency in which accrued to the
other party's account in a bank acceptable to the other party in the country
whose currency is involved.

     7.8  TAXES.  If a law or governmental regulation requires withholding of
taxes on any payment due hereunder, such taxes shall be deducted from any amount
to be remitted hereunder and shall be paid to the proper taxing authority, and
proof of payment shall be provided to the party on whose behalf such taxes were
paid as evidence of such payment in such form as required by the tax authorities
having jurisdiction thereover.

     7.9  REPORTS.  Each payment of any such technology access fee shall be
accompanied by a written report, prepared and signed by a financial officer of
Spiros Corp. II, showing for the quarter for which payment is being made, the
gross sales and Net Sales of each Spiros Product sold and the technolgy access
fees which shall have accrued with respect thereto and currency conversion
calculations, if any.  In the event that, for any quarter following the first
quarter in which a Spiros Product is sold for which such a technology access fee
would be payable, no such technology access fee is due, the party having
responsibility for sales of such Spiros Product shall report the same to the
other parties.  

     7.10 MAINTENANCE AND EXAMINATION OF RECORDS.  At the request and expense 
of DURA, Spiros Corp. II, or their respective Affiliates, the other parties 
hereto and their Affiliates shall permit an independent certified public 
accountant appointed by such party and reasonably acceptable to the other 
party, at reasonable times and upon reasonable notice (but not exceeding once 
in any twelve (12) month period), to examine those records as may be 
necessary to: (a) determine, with respect to any calendar year ending not 
more than three (3) years prior to such party's request, the correctness of 
any report or payment under this Agreement; or (b) obtain information as to 
the Spiros Product sales for any calendar year.  Said independent certified 
public accountant shall verify to the requesting party only the amount of 
payment due or costs incurred hereunder and disclose no other information 
revealed in its audit.  Results of any such examination shall be made 
available to the parties.  Any amount of deficiency, or overcharge, shall be 
paid or refunded promptly to Spiros Corp. II, plus interest at the commercial 
prime lending rate of Citibank, N.A., New York (or equivalent banking 

                                      - 15 -

<PAGE>

institution) until the date paid.  The party requesting the audit shall bear 
the full cost of the performance of any such audit unless such audit 
discloses a variance of more than five percent (5%) from the amount of the 
original report, technology access fee or payment calculation, in which case 
the party being audited shall bear the full cost of the performance of such 
audit.  DURA and Spiros Corp. II shall maintain and keep complete and 
accurate records in  sufficient detail to enable any examination concerning 
technology access fees to be conducted pursuant to this Section 7.10.  

8.   TERM AND TERMINATION.

     8.1  TERM.  This Agreement shall be effective as of the date hereof and
shall continue in full force and effect indefinitely, unless terminated earlier
as provided in Sections 8.2, 8.3 and 8.4 hereof.

     8.2  TERMINATION BY MUTUAL AGREEMENT.  By mutual agreement, the parties
hereto may at any time terminate this Agreement and the Development on mutually
acceptable terms.

     8.3  EFFECT OF PURCHASE OPTION EXERCISES.  

          8.3.1   PURCHASE OPTION.  In the event the Purchase Option is
exercised by DURA, this Agreement shall terminate, effective upon the Purchase
Option Closing Date, without any obligation to make payments pursuant to Section
7 of this Agreement.

          8.3.2   PARTIAL TERMINATION UPON EXERCISE OF ALBUTEROL OPTION.  In the
event that the Albuterol Option is exercised, this Agreement shall terminate,
effective on the Albuterol Option Closing Date, with respect to the Albuterol
Program Assets and any obligation to make technology access fee payments with
respect to the Albuterol Product, but shall otherwise continue in full force and
effect until terminated pursuant to this Section 8.

          8.3.3   PARTIAL TERMINATION UPON EXERCISE OF PRODUCT OPTION.  In the
event that the Product Option is exercised, this Agreement shall terminate,
effective on the Product Option Closing Date, with respect to the Spiros Product
Program Assets and any obligation to make technology access fee payments with
respect to the Option Product, but shall otherwise continue in full force and
effect until terminated pursuant to this Section 8.  

     8.4  TERMINATION BY DURA, DDSI AND SPIROS.  Either DURA, DDSI and Spiros
Corp., acting by unanimous action, or Spiros Corp. II shall have the right to
terminate this Agreement, effective as set forth in a written notice of the
occurrence of an Event of Default with respect to the other party.

     8.5  RIGHTS IN BANKRUPTCY.  All rights and licenses granted 


                                      - 16 -

<PAGE>

under or pursuant to this Agreement by DURA, DDSI, Spiros Corp. and Spiros 
Corp. II are, and shall otherwise be deemed to be, for purposes of Section 
365(n) of the Bankruptcy Code, licenses of rights to "intellectual property" 
as defined under Section 101 of the Bankruptcy Code.  The parties agree that 
DURA and Spiros Corp. II as licensees of such rights under this Agreement, 
shall retain and may fully exercise all of their rights and elections under 
the Bankruptcy Code.  The parties further agree that, in the event of the 
commencement of a bankruptcy proceeding by or against DURA, DDSI, Spiros 
Corp. or Spiros Corp. II under the Bankruptcy Code, the parties hereto which 
are not parties to such proceeding shall be entitled to a complete duplicate 
of (or complete access to, as appropriate) any such intellectual property and 
all embodiments of such intellectual property, and same, if not already in 
their possession, shall be promptly delivered to them upon any such 
commencement of a bankruptcy proceeding upon their written request therefor.

     8.6  EFFECT OF TERMINATION.

          8.6.1   TERMINATION BY DURA, DDSI AND SPIROS CORP..  If DURA, DDSI and
Spiros Corp. terminate this Agreement pursuant to Section 8.4 hereof, (a) the
licenses and sublicenses granted to Spiros Corp. II under Section 2.1 of this
Agreement shall terminate, (b) all rights to the DURA Core Technology shall
revert to DURA, all rights to the DDSI Core Technology shall revert to DDSI and
all rights to the Spiros Core Technology shall revert to Spiros Corp., (c) all
rights to the Program Technology except as set forth in (b) above shall revert
to DURA, (d) all rights to develop, make, have made, use, sell and import all
Spiros Products shall revert to DURA, DDSI and/or Spiros Corp. and (e) the
provisions of Sections 1, 3.2.6, 4.3, 4.4, 5.3, 6, 9.4 and 9.5 of this Agreement
shall survive.  DURA will use reasonable efforts for a period of 120 days after
a termination by DURA, DDSI and Spiros Corp., pursuant to Section 8.4 hereof, to
negotiate royalties or any other compensation to be paid by DURA to Spiros Corp.
II with respect to the Developed Technology that will revert to DURA.  In the
event the parties are unable to agree on the royalties or other compensation to
be paid by DURA with respect to the Developed Technology with the 120 day
period, such matter shall be submitted by DURA and Spiros Corp. II to binding
arbitration in accordance with the rules of the American Arbitration
Association.

          8.6.2   TERMINATION BY SPIROS CORP. II.  If Spiros Corp. II terminates
this Agreement pursuant to Section 8.4 hereof, the provisions of Sections 1,
2.1, 2.3.3 (if the Albuterol Option has been exercised), 2.3.4 (if the Product
Option has been exercised), 2.3.5, 3.2.6, 4.2.2, 4.3, 4.4, 5.3, 6, 7, 9.4 and
9.5 of this Agreement shall survive; PROVIDED, HOWEVER, if Spiros Corp. II fails
to perform or observe or otherwise breaches its Material Obligations under
Section 7 of this Agreement, which failure or breach is unremedied for a period
of sixty (60) days after receipt by Spiros Corp. II of written notice thereof
from DURA, or in the event such failure or breach 


                                      - 17 -

<PAGE>

is not capable of cure within sixty (60) days, for such longer period of time 
as Spiros Corp. II is vigorously pursuing such cure in good faith, DURA, DDSI 
and Spiros Corp. shall have the right to terminate this Agreement with the 
same effect as if DURA, DDSI and Spiros Corp. were to terminate this 
Agreement pursuant to Section 8.4 hereof.

          8.6.3   TERMINATION OF PURCHASE OPTION UNEXERCISED.  If the Purchase
Option terminates unexercised, the licenses and sublicenses granted under
Sections 2.3.1 and 2.3.2 of this Agreement shall terminate. 
 
          8.6.4   CONTINUING OBLIGATION TO MAKE PAYMENTS.  Notwithstanding
anything contained herein to the contrary, upon termination of this Agreement,
the obligation to pay any amounts payable by any party to another party which
accrued prior to such termination shall survive.

9.   MISCELLANEOUS.

     9.1  NO IMPLIED WAIVERS; RIGHTS CUMULATIVE.  No failure on the part of
DURA, DDSI, Spiros Corp. or Spiros Corp. II to exercise and no delay in
exercising any right, power, remedy or privilege under this Agreement or
provided by statute or at law or in equity or otherwise, including, without
limitation, the right or power to terminate this Agreement, shall impair,
prejudice or constitute a waiver of any such right, power, remedy or privilege
or be construed as a waiver of any breach of this Agreement or as an
acquiescence therein, nor shall any single or partial exercise of any such
right, power, remedy or privilege preclude any other or further exercise thereof
or the exercise of any other right, power, remedy or privilege.

     9.2  FORCE MAJEURE.  DURA, DDSI, Spiros Corp. and Spiros Corp. II shall
each be excused for any failure or delay in performing any of their respective
obligations under this Agreement, if such failure or delay is caused by Force
Majeure.

     9.3  RELATIONSHIP OF THE PARTIES.  Nothing contained in this Agreement is
intended or is to be construed to constitute DURA, DDSI, Spiros Corp. and Spiros
Corp. II as partners or joint venturers or one party as an employee of any other
party.  Except as expressly provided herein, no party hereto shall have any
express or implied right or authority to assume or create any obligations on
behalf of or in the name of any other party or to bind any other party to any
contract, agreement or undertaking with any third party.

     9.4  NOTICES.  All notices, requests and other communications to DURA,
DDSI, Spiros Corp. or Spiros Corp. II hereunder shall be in writing (including
telecopy or similar electronic transmissions), shall refer specifically to this
Agreement and shall be personally delivered or sent by telecopy or other
electronic facsimile transmission or by registered mail or certified mail,
return receipt requested and postage prepaid, or 


                                      - 18 -

<PAGE>

by reliable overnight courier service, in each case to the respective address 
specified below (or to such address as may be specified in writing to the 
other party hereto):

          If to DURA, addressed to:

          Dura Pharmaceuticals, Inc.
          7475 Lusk Boulevard
          San Diego, CA  92121
          Attention: President
            with a copy to the attention of General Counsel

          If to DDSI, addressed to:

          Dura Delivery Systems, Inc.
          7475 Lusk Boulevard
          San Diego, CA 92121
          Attention:  President

          If to SPIROS, addressed to:

          Spiros Development Corporation
          7475 Lusk Boulevard
          San Diego, CA 92121
          Attention:  President

          If to Spiros Corp. II, addressed to:

          Spiros Development Corporation II, Inc.
          7475 Lusk Boulevard
          San Diego, CA 92121
          Attention: President

Each party shall provide each other party with copies of any notices sent
hereunder, with such copies sent at the same time as the original notice.  Any
notice or communication given in conformity with this Section 9.4 shall be
deemed to be effective when received by the addressee, if delivered by hand,
telecopy or electronic transmission, three (3) days after mailing, if mailed,
and one (1) business day after delivery to a reliable overnight courier service.

     9.5  FURTHER ASSURANCES.  Each of DURA, DDSI, Spiros Corp. and Spiros Corp.
II hereby agrees to duly execute and deliver, or cause to be duly executed and
delivered, such further instruments and do and cause to be done such further
acts and things, including, without limitation, the filing of such additional
assignments, agreements, documents and instruments, that may be necessary or as
the other party hereto may at any time and from time to time reasonably request
in connection with this Agreement or to carry out more effectively the
provisions and purposes of, or to better assure and confirm unto such other
party its rights and remedies under, this Agreement.  

     9.6  SUCCESSORS AND ASSIGNS.  The terms and provisions of 


                                      - 19 -

<PAGE>

this Agreement shall inure to the benefit of, and be binding upon, DURA, 
DDSI, Spiros Corp., Spiros Corp. II and their respective successors and 
assigns; PROVIDED, HOWEVER, that DURA, DDSI, Spiros Corp. and Spiros Corp. II 
may not assign or otherwise transfer any of their respective rights and 
interests, nor delegate any of their respective obligations, hereunder, 
including, without limitation, pursuant to a merger or consolidation, without 
the prior written consent of the other party hereto; PROVIDED FURTHER, 
HOWEVER, that DURA, DDSI or Spiros Corp. may fully assign their respective 
rights and interests, and delegate their respective obligations, hereunder, 
effective upon written notice thereof (a) to an Affiliate if such Affiliate 
assumes all of the obligations of DURA, DDSI or Spiros Corp., as the case may 
be, hereunder and this Agreement remains binding upon Dura, DDSI or Spiros 
Corp., as the case may be; or (b) to any Person that acquires all or 
substantially all of the assets of Dura, DDSI or Spiros Corp. as the case may 
be, or which is the surviving Person in a merger or consolidation with Dura, 
DDSI or Spiros Corp. if such Person assumes all the obligations of DURA, DDSI 
or Spiros Corp., as the case may be, hereunder.  Notwithstanding the 
foregoing, Spiros Corp. II shall have the right to assign its rights and 
delegate its obligations hereunder following expiration or termination (other 
than by exercise) of the Purchase Option.  Any attempt to assign or delegate 
any portion of this Agreement in violation of this Section 9.6 shall be null 
and void.  Subject to the foregoing any reference to DURA, DDSI, Spiros Corp. 
or Spiros Corp. II hereunder shall be deemed to include the successors 
thereto and assigns thereof.

     9.7  AMENDMENTS.  No amendment, modification, waiver, termination or
discharge of any provision of this Agreement, nor consent by DURA, DDSI, Spiros
Corp. or Spiros Corp. II to any departure therefrom, shall in any event be
effective unless the same shall be in writing specifically identifying this
Agreement and the provision intended to be amended, modified, waived, terminated
or discharged and signed by DURA, DDSI, Spiros Corp. and Spiros Corp. II, and
each amendment, modification, waiver, termination or discharge shall be
effective only in the specific instance and for the specific purpose for which
given.  No provision of this Agreement shall be varied, contradicted or
explained by any other agreement, course of dealing or performance or any other
matter not set forth in an agreement in writing and signed by DURA, DDSI, Spiros
Corp. and Spiros Corp. II.

     9.8  GOVERNING LAW.  This Agreement shall be governed by and construed in
accordance with the laws of the State of California, as applied to contracts
made and performed entirely within the State of California.  Except as otherwise
provided herein, any claim or controversy arising out of or related to this
contract or any breach hereof shall be submitted to a court of competent
jurisdiction in the State of California, and the parties hereby consent to the
jurisdiction and venue of such court.

     9.9  SEVERABILITY. If any provision hereof should be held 


                                      - 20 -

<PAGE>

invalid, illegal or unenforceable in any respect in any jurisdiction, then, 
to the fullest extent permitted by law, (a) all other provisions hereof shall 
remain in full force and effect in such jurisdiction and shall be liberally 
construed in order to carry out the intentions of the parties hereto as 
nearly as may be possible and (b) such invalidity, illegality or 
unenforceability shall not affect the validity, legality or enforceability of 
such provision in any other jurisdiction.  To the extent permitted by 
applicable law, DURA, DDSI, Spiros Corp. and Spiros Corp. II hereby waive any 
provision of law that would render any provision hereof prohibited or 
unenforceable in any respect.

     9.10  HEADINGS. Headings used herein are for convenience only and shall not
in any way affect the construction of, or be taken into consideration in
interpreting, this Agreement.

     9.11  COUNTERPARTS.  This Agreement may be executed in any number of
counterparts, each of which counterparts, when so executed and delivered, shall
be deemed to be an original, and all of which counterparts, taken together,
shall constitute one and the same instrument.

     9.12  ENTIRE AGREEMENT. This Agreement, together with any agreements
referenced herein, constitute, on and as of the date hereof, the entire
agreement of DURA, DDSI, Spiros Corp. and Spiros Corp. II with respect to the
subject matter hereof, and all prior or contemporaneous understandings or
agreements, whether written or oral, between DURA, DDSI, Spiros Corp. and Spiros
Corp. II with respect to such subject matter are hereby superseded in their
entirety.


                [REMAINDER OF THIS PAGE INTENTIONALLY LEFT BLANK]






                                      - 21 -

<PAGE>

     IN WITNESS WHEREOF the parties have executed this Agreement as of the date
first above written.

                         SPIROS DEVELOPMENT CORPORATION II, INC.



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



                         DURA PHARMACEUTICALS, INC.



                         By: /s/ Cam L. Garner
                             -------------------------------------------
                              Cam L. Garner
                              President and Chief Executive Officer



                         DURA DELIVERY SYSTEMS, INC.



                         By: /s/ Mitchell R. Woodbury
                             -------------------------------------------
                              Mitchell R. Woodbury
                              Secretary



                         SPIROS DEVELOPMENT CORPORATION



                         By: /s/ Mitchell R. Woodbury
                             -------------------------------------------
                              Mitchell R. Woodbury
                              Secretary




                [SIGNATURE PAGE TO TECHNOLOGY LICENSE AGREEMENT]


<PAGE>

                                  SCHEDULE 1.1

                                    GLOSSARY








                                  SCHEDULE 1.1

<PAGE>

                                  SCHEDULE 1.1

                                    GLOSSARY

     "AFFILIATE" of a person shall mean a Person that directly, or indirectly
through one or more intermediaries, controls, is controlled by or is under
common control with such Person.  "Control" (and, with correlative meanings, the
terms "controlled by" and "under common control with") shall mean the possession
of the power to direct or cause the direction of the management and policies of
such Person, whether through the ownership of voting stock, by contract or
otherwise.  In the case of a corporations, "control" shall mean, among other
things, the direct or indirect ownership of more than fifty percent (50%) of its
outstanding voting stock.

     "AGREEMENTS" shall mean the Manufacturing and Marketing Agreement, the
Technology Agreement and the Development Agreement.  

     "ALBUTEROL OPTION" shall have the meaning assigned to it in Section 1.1 of
the Albuterol and Product Option Agreement.

     "ALBUTEROL AND PRODUCT OPTION AGREEMENT" shall mean the Albuterol and
Product Option Agreement dated as of December 22, 1997, between DURA and Spiros 
Corp. II, as amended, modified or supplemented from time to time.

     "ALBUTEROL OPTION CLOSING DATE" shall have the meaning assigned to it in
Section 1.5 of the Albuterol and Product Option Agreement.

     "ALBUTEROL PROGRAM ASSETS" shall have the meaning assigned to it in Section
1.1 of the Albuterol and Product Option Agreement.

     "ALBUTEROL PRODUCT" shall have the meaning assigned to it in Section 1.1 of
the Albuterol and Product Option Agreement.

     "AVAILABLE FUNDS" shall mean the sum of (a) the net proceeds to Spiros
Corp. II from the sale of the Units in the Offering and the Contribution, (b)
all royalties remitted to Spiros Corp. II by DURA (or its Affiliates) from the
Sale of Spiros Products pursuant to the Agreements, (c) the Option Proceeds, if
any, (d) any other amounts provided by DURA to Spiros Corp. II, if any and (e)
interest or other income earned through temporary investment of the amounts
described in clauses (a), (b), (c) or (d).

     "BANKRUPTCY CODE" shall mean the United States Bankruptcy Code, as amended
from time to time.

     "CLAIM" shall mean any and all liabilities, damages, losses, settlements,
claims, actions, suits, penalties, fines, costs or expenses (including, without
limitation, reasonable attorneys' fees).

                                  SCHEDULE 1.1
<PAGE>

     "CONFIDENTIAL INFORMATION" shall mean all Program Technology disclosed by
DURA (and its Affiliates) to Spiros Corp. II or by Spiros Corp. II to DURA
pursuant to the Agreements or the Services Agreement.

     "CONTRIBUTION" shall have the meaning assigned in Section 5.2 of the
Development Agreement.

     "CORE TECHNOLOGY" shall mean the DURA Core Technology, the DDSI Core
Technology and the Spiros Core Technology.

     "DDSI CORE TECHNOLOGY" shall mean (a) Technology owned or controlled by
DDSI as of the date of the closing of the Offering necessary or useful to the
development of the Spiros Products, and (b) the DDSI Patent Rights; PROVIDED,
HOWEVER, that DDSI Core Technology shall also include Technology acquired by
DDSI from a third party after the date of the closing of the Offering necessary
or useful to the development of the Spiros Products, except to the extent that
there are any limitations or restrictions on DDSI's ability to license or
sublicense such Technology.  "Owned or controlled" shall include Technology that
DDSI owns, or under which DDSI is licensed and has the right to grant
sublicenses and/or grant immunity from suit.

     "DDSI INDEMNITEE" shall mean DDSI, its successors and assigns, and the
directors, officers, employees, agents and counsel thereof.

     "DDSI PATENT RIGHTS" shall mean those certain inventions described in
claims of (a) the patent applications pending, filed by DDSI (or the rights to
which have been assigned to DDSI) as of the date of the Technology Agreement
relating to dry powder inhalers, powder storage systems and/or formulation
methods for dry powder inhalation, (b) any patent application constituting an
equivalent, counterpart, reissue, extension or continuation (including, without
limitation, a continuation in part or a subdivision) of any of the foregoing
patent applications and (c) any patent issued or issuing upon any of the
foregoing.

     "DESIGNATED COMPOUND(S)" shall mean any compounds for delivery using the
System selected by Spiros Corp. II, and agreed to be developed by DURA.

     "DEVELOPED TECHNOLOGY" shall mean any Technology including, without
limitation, any enhancements, substitutions or improvements to the Core
Technology that is (a) discovered, developed or otherwise acquired by DURA
pursuant to the terms of the Development Agreement or (b) otherwise acquired by
or on behalf of Spiros Corp. II during the term of the Development Agreement.

     "DEVELOPMENT" shall mean the further development of the Program Technology
for the purpose of identifying, developing, manufacturing, marketing and
commercializing Spiros Products and 

                                  SCHEDULE 1.1
<PAGE>

the making of the Other Expenditures.

     "DEVELOPMENT AGREEMENT" shall mean the Development Agreement dated as of 
December 22, 1997, between DURA and Spiros Corp., as amended, modified or 
supplemented from time to time.

     "DEVELOPMENT COSTS" shall mean the Direct Development Costs, the Indirect
Development Costs and the Other Expenditures.

     "DEVELOPMENT TERM" shall mean the period commencing on the Closing Date and
ending on the earlier of (a) the Option Closing Date or (b) the date the Option
terminates or expires other than by exercise.

     "DIRECT DEVELOPMENT COSTS" shall mean all costs incurred by DURA or its 
Affiliates in respect of the Development, other than Indirect Development 
Costs, determined in accordance with generally accepted accounting principles 
consistent with DURA's internal accounting system, allocated on a reasonable 
and consistent basis.  Direct Development Costs shall consist primarily of 
fully-burdened payroll costs (burdened to include benefits, payroll taxes and 
an allocation of facilities and overhead costs) and any other such costs 
generated internally by DURA in respect of the Development.

     "DPI" shall mean the motor-driven dry powder inhaler (other than an inahler
designed to deliver a single dose of a drug) developed by DURA, DDSI and/or
Spiros Corp. and to be developed by DURA and/or Spiros Corp. II.

     "DURA COMMON STOCK" shall mean the Common Stock of DURA, par value $.001
per share.  

     "DURA CORE TECHNOLOGY" shall mean (a) Technology owned or controlled by
DURA as of the date of the closing of the Offering necessary or useful to the
development of the Spiros Products, and (b) the DURA Patent Rights and DURA
Trademarks; PROVIDED, HOWEVER, that DURA Core Technology shall also include
Technology acquired by DURA from a third party after the date of the closing of
the Offering necessary or useful to the development of the Spiros Products,
except to the extent that there are any limitations or restrictions on DURA's
ability to license or sublicense such Technology.  "Owned or controlled" shall
include Technology that DURA owns, or under which DURA is licensed and has the
right to grant sublicenses and/or grant immunity from suit.

     "DURA INDEMNITEE" shall mean DURA, its successors and assigns, and the
directors, officers, employees, agents and counsel thereof.

     "DURA PATENT RIGHTS" shall mean those certain inventions described in
claims of (a) the patent applications pending, filed by DURA (or the rights to
which have been assigned to DURA) as of the date of the Technology Agreement
relating to DPIs, PSSs and/or formulation methods for dry powder inhalation, (b)
any 

                                  SCHEDULE 1.1
<PAGE>

patent application constituting an equivalent, counterpart, reissue,
extension or continuation (including, without limitation, a continuation in part
or a subdivision) of any of the foregoing patent applications and (c) any patent
issued or issuing upon any of the foregoing.

     "DURA TRADEMARKS" shall mean Spiros-TM-.

     "EVENT OF DEFAULT" shall mean any of the following events:  (a) at any
time, if DURA or Spiros Corp. II fails to perform or observe or otherwise
breaches any of its Material Obligations, and such failure or breach continues
unremedied for a period of sixty (60) days after receipt by of written notice
thereof from the other party; (b) at any time, effective as set forth in a
written notice from the other party if DURA or Spiros Corp. II shall (i) seek
the liquidation, reorganization, dissolution or winding-up of itself or the
composition or readjustment of its debts (other than pursuant to a merger with
an Affiliate), (ii) apply for or consent to the appointment of, or the taking
possession by, a receiver, custodian, trustee or liquidator for itself or of all
or a substantial part of its assets, (iii) make a general assignment for the
benefit of its creditors, (iv) commence a voluntary case under the Bankruptcy
Code, (v) file a petition seeking to take advantage of any other law relating to
bankruptcy, insolvency, reorganization, winding-up or composition or
readjustment of debts (other than pursuant to a merger with an Affiliate) or
(vi) adopt any resolution of its Board of Directors or shareholders for the
purpose of effecting any of the foregoing (other than pursuant to a merger with
an Affiliate); or (c) at any time, effective as set forth in a written notice
from the other party, if a proceeding or case shall be commenced without the
application or consent of DURA or Spiros Corp. II as applicable, and such
proceeding or case shall continue undismissed, or an order, judgment or decrees
approving or ordering any of the following shall be entered and continued
unstayed and in effect, for a period of sixty (60) days from and after the date
service of process is effected, seeking (i) DURA's or Spiros Corp. II's, as
applicable, liquidation, reorganization, dissolution or winding-up, or the
composition or readjustment of its debts, (ii) the appointment of a trustee,
receiver, custodian, liquidator or the like of DURA or Spiros Corp. II or for
all or any substantial part of its assets or (iii) similar relief in respect of
DURA or Spiros Corp. II under any law relating to bankruptcy, insolvency,
reorganization, winding-up or the composition or readjustment of debts.

     "FDA" shall mean the United States Food and Drug Administration or any
successor agency or authority, the approval of which is required to market
health care products in the United States.

     "FDA APPROVAL" shall mean the final regulatory approval of the FDA required
to commence commercial marketing of a health product.

                                  SCHEDULE 1.1
<PAGE>

     "FORCE MAJEURE" shall mean any act of God, any accident explosion, fire,
storm, earthquake, flood, drought, peril of the sea, riot, embargo, war or
foreign, federal, state or municipal order of general application, seizure,
requisition or allocation, any failure or delay of transportation, shortage of
or inability to obtain supplies, equipment, fuel or labor or any other
circumstance or event beyond the reasonable control of the party relying upon
such circumstance or event.

     "INDIRECT DEVELOPMENT COSTS" shall mean all costs, fees and out-of-pocket
or other expenses, including the purchase of any capital equipment related to
the Development, incurred or paid by DURA to a third party, other than an
Affiliate of DURA, in respect of the Development, determined in accordance with
generally accepted accounting principles consistent with DURA's internal
accounting system, allocated on a reasonable and consistent basis.

     "MANUFACTURING AND MARKETING AGREEMENT" shall mean the Manufacturing and 
Marketing Agreement dated as of December 22, 1997 between DURA and Spiros 
Corp. II, as amended, modified or supplemented from time to time.

     "MANUFACTURE" shall mean the manufacture and assembly of the Spiros
Products.

     "MATERIAL OBLIGATION" shall mean the material obligations of a party under
the Technology Agreement, the Development Agreement or the Manufacturing and
Marketing Agreement.

     "NET SALES" shall mean the gross amount invoiced for sales of Spiros
Products by DURA or its sublicensees, if any, to third parties less (i)
discounts actually allowed, (ii) credits for claims, allowances, retroactive
price reductions or returned Spiros Products, (iii) prepaid freight charges
incurred in transporting Spiros Products to customers, (iv) sales taxes and
other governmental charges actually paid in connection with the sales (but
excluding what is commonly known as income taxes) and (v) any royalty
obligations under the 1993 Royalty Agreement.  Net Sales shall not include sales
between or among DURA, its Affiliates and its sublicensees unless such sales are
for end use rather than for purposes of resale.

     "OFFERING" shall mean the underwritten public offering of the Units
pursuant to the Registration Statement.

     "OPTION PROCEEDS" shall have the meaning assigned to it in Section 3 of the
Albuterol and Product Option Agreement. 

     "OPTION PRODUCT" shall have the meaning assigned to it in Section 2.1 of
the Albuterol and Product Option Agreement.

     "OTHER EXPENDITURES" shall mean funds spent by Spiros Corp. II to acquire
capital equipment, develop a next generation inhaler system or to enhance the
System.

                                  SCHEDULE 1.1
<PAGE>

     "PATENT RIGHTS" shall mean any patents or patent applications within the
Spiros Corp. II Patent Rights, the DURA Patent Rights, the DDSI Patent Rights
and the Spiros Corp. Patent Rights.

     "PERSON" shall mean any individual, partnership, corporation, firm,
association, unincorporated organization, joint venture, trust or other entity.

     "PRODUCT OPTION" shall have the meaning assigned to it in Section 2.1 of
the Albuterol and Product Option Agreement. 

     "PRODUCT OPTION CLOSING DATE" shall have the meaning assigned to it in
Section 2.5 of the Albuterol and Product Option Agreement.

     "PROGRAM TECHNOLOGY" shall mean the Core Technology and the Developed
Technology.

     "PSS" shall mean the powder storage system developed and to be developed by
DURA for use with the DPI.

     "PURCHASE AGREEMENT" shall mean the Purchase Agreement dated as of
December 16, 1997, among DURA, Spiros Corp. II, Merrill Lynch & Co., and
Donaldson, Lufkin & Jenrette.  

     "PURCHASE OPTION" shall mean the option granted to the holder of Spiros
Corp. II's Special Common Stock to purchase all of the Spiros Corp. II Common
Stock as set forth in Article V of the Spiros Corp. II Charter.

     "PURCHASE OPTION CLOSING DATE" shall have the meaning assigned to it in
Article V of the Spiros Corp. II Charter.

     "PURCHASE OPTION EXERCISE PRICE" shall have the meaning assigned to it in
Article V of the Spiros Corp. II Charter 

     "REGISTRATION STATEMENT" shall mean the Registration Statement on Form 
S-1/S-3 filed by Spiros Corp. II and DURA dated October 10, 1997 (No. 
333-37673/333-37673-01), including all exhibits and any amendments thereof 
and supplements thereto.

     "RESEARCH FUNDS" shall mean the Available Funds, less (i) all general and
administrative expenses including, without limitation, those paid or payable
pursuant to the Development Agreement or the Services Agreement, and the
reasonable out-of-pocket expenses of Spiros Corp. II directors and reasonable
compensation for Spiros Corp. II's independent directors, less (ii) any amounts
paid to DURA under the Development Agreement or the Services Agreement, less
(iii) any costs and expenses incurred in the defense or settlement of any action
or claim or in respect of a judgment thereon, and less (iv) One Million Dollars
($1,000,000) to be retained by Spiros Corp. II as working capital in the event
DURA does not exercise the Purchase Option.

                                  SCHEDULE 1.1
<PAGE>

     "SALE(S)" or "SELL" shall mean the activity undertaken by a sales
representative during a sales call on physicians, physician assistants, nurses,
hospitals, clinics, health maintenance organizations, preferred provider
organizations and managed care companies (including all forms of communication
not involving face to face contact by such sales representatives), describing
the FDA-approved indicated uses, safety, effectiveness, contraindications, side
effects, warnings and other relevant characteristics of the Spiros Product, in a
fair and balanced manner consistent with the requirements of the Federal Food,
Drug, and Cosmetic Act, as amended (and the regulations thereunder).  

     "SPIROS CASSETTE SYSTEM" shall mean a DPI in which the PSS is in the form
of a cassette.

     "SPIROS CORE TECHNOLOGY" shall mean (a) Technology owned or controlled by
Spiros Corp. as of the date of the closing of the Offering necessary or useful
to the development of the Spiros Products, and (b) the Spiros Corp. Patent
Rights; PROVIDED, HOWEVER, that Spiros Core Technology shall also include
Technology acquired by Spiros Corp. from a third party after the date of the
closing of the Offering necessary or useful to the development of the Spiros
Products, except to the extent that there are any limitations or restrictions on
Spiros Corp.'s ability to license or sublicense such Technology.  "Owned or
controlled" shall include Technology that Spiros Corp. owns, or under which
Spiros Corp. is licensed and has the right to grant sublicenses and/or grant
immunity from suit.

     "SPIROS CORP. INDEMNITEE" shall mean Spiros Corp., its successors and
assigns, and the directors, officers, employees, agents and counsel thereof.  

     "SPIROS CORP. PATENT RIGHTS" shall mean those certain inventions described
in claims of (a) the patent applications pending, filed by Spiros Corp. (or the
rights to which have been assigned to Spiros Corp.) as of the date of the
Technology Agreement relating to dry powder inhalers, powder storage systems
and/or formulation methods for dry powder inhalation, (b) any patent application
constituting an equivalent, counterpart, reissue, extension or continuation
(including, without limitation, a continuation in part or a subdivision) of any
of the foregoing patent applications and (c) any patent issued or issuing upon
any of the foregoing.

     "SPIROS CORP. II CHARTER" shall mean Amended and Restated Certificate of
Spiros Development Corporation II, Inc. in effect as of the closing of the
Offering, as amended from time to time.

     "SPIROS CORP. II COMMON STOCK" shall mean the Callable Common Stock of
Spiros Corp. II, $.001 par value.

     "SPIROS CORP. II INDEMNITEE" shall mean Spiros Corp. II, its 

                                  SCHEDULE 1.1
<PAGE>

successors and assigns, and the directors, officers, employees, agents and 
counsel thereof.

     "SPIROS CORP. II PATENT RIGHTS" shall mean those certain inventions
described in claims of (a) any patent application having one or more claims
covering Developed Technology, (b) any patent application constituting an
equivalent, counterpart, reissue, extension or continuation (including, without
limitation, a continuation in part or a subdivision) of any of the foregoing
applications or (c) any patent issued or issuing upon any of the foregoing
applications.

     "SPIROS PRODUCT(S)" shall mean (a) any System used with a formulation of
albuterol, beclomethasone, ipratropium, an albuterol-ipratropium combination,
budesonide or a Designated Compound developed, produced, manufactured or
marketed by DURA on behalf of Spiros Corp. II using the Program Technology.

     "SPIROS PRODUCT PROGRAM ASSETS" shall have the meaning assigned to it in
Section 2.1 of the Albuterol and Product Option Agreement.

     "SYSTEM" shall mean the DPI and the PSS when used together.

     "TECHNOLOGY" shall mean, solely with respect to motor-driven dry powder
inhalers and powder storage systems for drugs for delivery through such
inhalers, the manufacture thereof, and formulations of drugs to be delivered
through such inhalers, public and nonpublic technical or other information,
trade secrets, know-how, processes, formulations, concepts, ideas, preclinical,
clinical, pharmacological or other data and testing results, experimental
methods, or results, assays, descriptions, business or scientific plans,
depictions, customer lists and any other written, printed or electronically
stored materials, pharmaceutical compounds or any other natural or man-made
pharmaceutical materials and any and all other intellectual  property, including
patents and patent applications, of any nature whatsoever.  The term
"Technology" shall include, without limitation, any of the foregoing as it
relates to enhancements of, substitutions for or improvements to the Core
Technology.

     "TECHNOLOGY AGREEMENT" shall mean the Technology License Agreement dated 
as of December 22, 1997, among DURA, DDSI, Spiros Corp. and Spiros Corp. II, 
as amended, modified or supplemented from time to time.

     "TERRITORY" shall mean the entire world.
     
     "UNDERWRITERS" shall have the meaning assigned to it in the Registration
Statement.

     "UNITS" shall mean units, each consisting of one share of Spiros Corp. II
Common Stock and one warrant to purchase one-fourth of one share of DURA Common
Stock, all as described in the Registration Statement.

                                  SCHEDULE 1.1
<PAGE>

     "1993 ROYALTY AGREEMENT" shall have the meaning assigned to it in the
Registration Statement.







                                  SCHEDULE 1.1

<PAGE>


                              DEVELOPMENT AGREEMENT


     This DEVELOPMENT AGREEMENT (the "Agreement") is made as of December 22,
1997, by and between DURA PHARMACEUTICALS, INC., a Delaware corporation
("DURA"), and SPIROS DEVELOPMENT CORPORATION II, INC., a Delaware corporation
("Spiros Corp. II").

                                    RECITALS

     WHEREAS, DURA and Spiros Corp. II are parties to the Technology Agreement,
the Manufacturing and Marketing Agreement, and the Albuterol and Product Option
Agreement (all capitalized terms shall have the respective meaning set forth in
Section 1 hereto). 

     WHEREAS DURA, Dura Delivery Systems, Inc., a Delaware corporation ("DDSI"),
and Spiros Development Corporation, a Delaware corporation ("Spiros Corp."),
have granted to Spiros Corp. II, and Spiros Corp. II has acquired from DURA,
DDSI and Spiros Corp., a license to certain technology for the purpose of
allowing Spiros Corp. II to further develop the Core Technology and to develop
and commercialize the Spiros Products.

     WHEREAS, DURA has experience in the development of pharmaceutical products
and has the facilities, equipment, employees and other resources to accomplish
development activities, on behalf of Spiros Corp. II, with respect to such
rights and technology.

     WHEREAS, Spiros Corp. II desires to engage DURA to perform such services in
connection with the Development, and DURA is willing to provide such services.

     NOW, THEREFORE, in consideration of the mutual covenants set forth herein
and for other good and valuable consideration, the receipt and sufficiency of
which are hereby acknowledged, and in order to induce DURA to enter into the
Agreements, DURA and Spiros Corp. II hereby agree as follows:

1.   DEFINITIONS.

     1.1  DEFINITIONS.  All capitalized terms used herein and not otherwise
defined shall have the respective meanings, to the extent such terms are used
herein, set forth in SCHEDULE 1.1 attached hereto, which is incorporated by this
reference as though fully set forth herein.

     1.2  SINGULAR AND PLURAL.  Singular and plural forms, as the case may be,
of terms defined herein shall have correlative meanings.

2.   DEVELOPMENT SERVICES.

     2.1  DEVELOPMENT.  Spiros Corp. II hereby engages DURA, and DURA hereby
accepts such engagement, to use commercially reasonable efforts to undertake the
Development.  Such services shall be provided as follows:

<PAGE>

          2.1.1  WORKPLAN AND BUDGET.  As of the date of the closing of the
Offering, DURA shall have provided Spiros Corp. II with a workplan and budget
acceptable to the Board of Directors of Spiros Corp. II covering the period from
the closing through December 31, 1998, a copy of which is attached hereto as
SCHEDULE 2.1.  Thereafter, DURA and Spiros Corp. II shall prepare an annual
workplan and budget in accordance with Section 3 hereof.  DURA and Spiros Corp.
II may make changes in the annual workplan and budget from time to time as
approved in writing by an authorized representative of each party.  Expenditures
made on behalf of Spiros Corp. II by DURA for which DURA is to be reimbursed
pursuant to Section 5.1 hereof, shall not exceed in any calendar year one
hundred twenty percent (120%) of the amount allocated in the annual workplan and
budget applicable to such year unless otherwise approved by the Board of
Directors of Spiros Corp. II.  DURA shall report significant deviations from the
annual workplan and budget to Spiros Corp. II in a timely manner.

          2.1.2  CONDUCT OF DEVELOPMENT.  During the term of this Agreement,
DURA shall use commercially reasonable efforts to (a) conduct the Development on
behalf of Spiros Corp. II in a prudent and skillful manner in accordance, in all
material respects, with the annual workplan and budget then in effect and
applicable laws, ordinances, rules, regulations, orders, licenses and other
requirements now or hereafter in effect and (b) diligently execute such annual
workplan and budget and report to Spiros Corp. II any significant deviations
therefrom in a timely manner.  Spiros Corp. II hereby appoints DURA its
exclusive agent, for the term of this Agreement, with the sole power and
authority to file and prosecute all necessary regulatory applications and
permits in DURA's name required to obtain FDA Approval and other regulatory
approvals for the Spiros Products.  DURA shall, at Spiros Corp. II's expense as
described below, furnish all labor, supervision, services, supplies and
materials necessary to perform the Development in accordance with the annual
workplan and budget then in effect.  In addition to its undertakings pursuant to
the Technology Agreement, DURA agrees to use commercially reasonable efforts, on
behalf of itself, DDSI and Spiros Corp., to attempt to obtain and to sublicense
to Spiros Corp. II subject to the terms and conditions of the Technology
Agreement, on behalf of and at the expense of Spiros Corp. II but in accordance
with Section 2.4 of the Technology Agreement, any patent or technology license
or sublicense from any Person, including DURA, DDSI or Spiros Corp., that DURA
reasonably determines to be necessary or useful to enable DURA to conduct the
Development under this Agreement.

          2.1.3  SUBCONTRACTS.  Spiros Corp. II acknowledges that DURA may elect
to subcontract to third parties a portion of the Development.  Spiros Corp. II
acknowledges and agrees that in performing the Development, DURA may, and is
hereby authorized to, without the prior written consent of Spiros Corp. II,
engage or agree or otherwise collaborate with other Persons, including, without
limitation, Affiliates of DURA or institutions performing other development
activities for DURA, to provide assistance in carrying out the Development.

          2.1.4  CHANGES TO THE WORKPLANS.  If at any time Spiros Corp. II
determines, based on the reports furnished pursuant to Section 3 hereof, in its
reasonable business judgment and in consultation with DURA, or DURA determines
with Spiros Corp. II's consent (which consent shall not be withheld
unreasonably), that the Development should be discontinued with respect to the

                                       -2-
<PAGE>

further development of a particular Spiros Product because the continuance
thereof is unfeasible or uneconomic, or that the Development should be expanded
to include one or more Designated Compounds, then Spiros Corp. II and DURA shall
use all reasonable efforts to agree on the nature of further development and the
identity of such Designated Compounds. 

          2.1.5  SALE OF SPIROS PRODUCTS PRIOR TO REGULATORY APPROVAL.  
Spiros Corp. II hereby appoints DURA as its exclusive agent for the 
Manufacture and Sale of Spiros Products during the term of this Agreement for 
the sole purpose of conducting the clinical testing required to obtain FDA 
Approval or other regulatory approval to market such Spiros Products.  DURA 
shall charge Spiros Corp. II for all the costs (determined in accordance with 
Section 6.5 hereof) relating to the Manufacture and Sale of such Spiros 
Products prior to FDA Approval of such Spiros Products as Development Costs, 
and shall remit to Spiros Corp. II any revenues received by it from the sale 
of such Spiros Products.  Spiros Corp. II agrees that all such revenues 
received hereunder with respect to Spiros Products shall be considered 
Available Funds. 

          2.1.6     MANUFACTURE AND SALE OF SPIROS PRODUCTS FOLLOWING 
REGULATORY APPROVAL.  Spiros Corp. II and DURA hereby agree that the 
Manufacture and Sale of each Spiros Product during the term of this Agreement 
following FDA Approval or other required regulatory approval to market such 
Spiros Product shall be governed solely by the terms and conditions of the 
Manufacturing and Marketing Agreement.

     2.2  DISCLAIMER OF WARRANTIES.  DURA cannot and does not guarantee that the
Development will be successful in whole or in part, that any Spiros Products
will be developed or that any developed Spiros Products will be successful in
the marketplace.  To the extent that DURA has complied with Section 2.1.2
hereof, the failure of DURA to further develop successfully the Program
Technology or to discover, develop or commercialize any Spiros Product will not
in and of itself constitute a breach by DURA of any representation, warranty,
covenant or other obligation under the Agreements.  In addition, neither DURA
nor Spiros Corp. II makes any representation or warranty or guaranty that the
Available Funds will be sufficient for the completion of the Development of any
or all of the Spiros Products or to begin commercialization with respect to any
Spiros Product.

     2.3  RIGHTS TO PROPERTY.  All right, title and interest to the Program
Technology acquired or developed pursuant to this Agreement including any
submissions or applications to the FDA or any foreign equivalent made by DURA in
its name on behalf of Spiros Corp. II shall be the exclusive property of Spiros
Corp. II; PROVIDED, HOWEVER, that such right, title and interest shall be
subject in all events to (a) the rights to Albuterol Program Assets obtained
from Spiros Corp. II pursuant to the exercise of the Albuterol Option or (b) the
rights to the Spiros Product Program Assets obtained from Spiros Corp. II
pursuant to the exercise of the Product Option.  All matters relating to patents
and patent applications with respect to the Program Technology acquired or
developed pursuant to this Agreement shall be governed by Section 5.2 of the
License Agreement.

                                       -3-
<PAGE>

     2.4  TERMINATION OF DEVELOPMENT UPON EXERCISE OF THE ALBUTEROL OPTION.  If
the Albuterol Option is exercised, Development hereunder shall cease with
respect to the Albuterol Product.  DURA and the Board of Directors of Spiros
Corp. II shall agree upon an allocation to one or more remaining Spiros Products
or to the Other Expenditures of the funds available as a result of the exercise
of the Albuterol Option.  

     2.5  TERMINATION OF DEVELOPMENT UPON EXERCISE OF THE PRODUCT OPTION.  If
the Product Option is exercised, Development hereunder shall cease with respect
to the Option Product.  DURA and the Board of Directors of Spiros Corp. II shall
agree upon an allocation to one or more remaining Spiros Products or to the
Other Expenditures of the funds available as a result of the exercise of the
Product Option.

3.   REPORTS AND RECORDS.  Within thirty (30) days after the end of each
calendar quarter during the term of this Agreement, DURA shall provide to the
Board of Directors of Spiros Corp. II a reasonably detailed report setting forth
in respect of such quarter (a) the total Development Costs incurred, (b) a
summary of the work performed hereunder by DURA and its employees and agents and
(c) a description of any material developments with respect to the Program
Technology.  Prior to December 1 of each year (commencing with December 1, 1998)
during the term of this Agreement, DURA shall report to the Board of Directors
of Spiros Corp. II with respect to the progress of the Development, which report
shall include the proposed annual workplan and budget for the next calendar
year.  Prior to January 1 of each year (commencing January 1, 1999), the Board
of Directors of Spiros Corp. II shall approve such annual workplan and budget
with such changes as it may, in the exercise of its reasonable business
judgment, deem necessary and as DURA may approve (which approval shall not be
unreasonably withheld); PROVIDED, that no annual workplan and budget shall be
deemed effective until approved by DURA and the Board of Directors of Spiros
Corp. II.  DURA shall prepare a final report, within ninety (90) days after the
expiration or termination of this Agreement, setting forth in reasonable detail
a summary of the work performed since the last report provided to the Board of
Directors hereunder and the material developments with respect thereto and
containing a final statement of all costs billed to Spiros Corp. II hereunder. 
DURA shall keep and maintain proper and complete records and books of account
documenting all of its expenses related to the Development, including those
allocated to and reimbursed by Spiros Corp. II hereunder.  At Spiros Corp. II's
request and expense, DURA shall permit a certified independent public accountant
selected by Spiros Corp. II to have access, no more than once in each calendar
year during the term of this Agreement and each year for three (3) calendar
years following the termination hereof, during regular business hours and upon
reasonable notice to DURA, to such records and books for the sole purpose of
determining the appropriateness of Development Costs invoiced hereunder;
PROVIDED, HOWEVER, that if such certified independent public accountant
reasonably determines that such Development Costs have been, for any calendar
year, after adjustments herein provided for, overstated by DURA by an amount
equal to or greater than five percent (5%), DURA shall promptly refund any such
overpayment to Spiros Corp. II and pay all reasonable fees and disbursements of
such certified independent public accountant incurred in the course of making
such determination.

4.   OTHER ACTIVITIES.  During the term of this Agreement, DURA shall devote
such time and 

                                       -4-
<PAGE>

effort to the performance of services pursuant to this Agreement as may be 
necessary or appropriate to fulfill its duties under this Agreement; 
PROVIDED, HOWEVER, it is specifically understood and agreed by Spiros Corp. 
II that DURA shall not be required to devote itself, on a full-time basis, to 
the provision of such services and that DURA shall have the right to engage 
in its own development activities and in other business activities with other 
Persons, and Spiros Corp. II shall not, by virtue of this Agreement, have any 
right, title or interest in or to such independent activities or to the 
income or profits derived therefrom and, without limiting DURA's obligation 
to use commercially reasonable efforts to provide certain services hereunder, 
nothing set forth in this Agreement shall limit or reduce the ability of DURA 
to carry on such other activities.

5.   PAYMENT FOR SERVICES; TIMING OF PAYMENTS.


     5.1  PAYMENTS FOR DEVELOPMENT.  In consideration of the Development 
to be carried out by DURA during the term of this Agreement, Spiros Corp. II 
shall reimburse DURA out of Available Funds for all of (a) the Direct 
Development Costs plus a fee equal to twenty-five percent (25%) of all of 
such costs (the "Management Fee"), PROVIDED that the cost to DURA of services 
provided by Affiliates of DURA shall not exceed the cost to each Affiliate of 
providing such services, and (b) the Indirect Development Costs plus a fee 
equal to twenty percent (20%) of all such costs (the "Indirect Management 
Fee"), invoiced to Spiros Corp. II by DURA. The amount to be paid to DURA 
pursuant to this Agreement shall not exceed the amount of the Available 
Funds.  The Available Funds must be retained by Spiros Corp. II in an account 
separate from all accounts containing any other funds. Spiros Corp. II agrees 
to expend all Available Funds on Development and Other Expenditures pursuant 
to this Agreement, except as otherwise set forth in the Agreements.  In the 
event that the cash and cash equivalents of Spiros Corp. II are reduced to 
less than $5 million, DURA may, within thirty (30) days following notice from 
Spiros Corp. II that such funds have been reduced to less than $5 million, at 
its option (the "Funding Option"), provide additional funds sufficient in the 
reasonable judgment of DURA and Spiros Corp. II to fund the continued 
Development of Spiros Products for an additional twelve (12) months at a 
level comparable to the level of funding provided during the prior twelve 
(12) months, which funding shall be considered Available Funds.  The Funding 
Option may only be exercised one time and shall be irrevocable following 
exercise. Payment to Spiros Corp. II of all amounts in respect of the Funding 
Option must be made within thirty (30) days of its exercise. 

     5.2  CONTRIBUTIONS.  Concurrently with the execution of this Agreement,
DURA will contribute Seventy-Five Million Dollars ($75,000,000) in cash to
Spiros Corp. II (the "Contribution").

     5.3  DEVELOPMENT EXPENSES.  Within five (5) business days of the closing of
the Offering and upon the receipt by Spiros Corp. II of an invoice therefor,
Spiros Corp. II shall reimburse DURA for all development services as set forth
on SCHEDULE 5.3 incurred by DURA through the date of the closing of the
Offering, estimated to be five million Dollars ($5,000,000)
but which shall in no event exceed seven million Dollars
($7,000,000).

     5.4  TIMING OF PAYMENTS.  Spiros Corp. II shall pay to DURA monthly the
Development 

                                       -5-
<PAGE>

Costs, plus the applicable Management Fee and Indirect Management Fee, 
actually incurred in the prior month as shown on a statement delivered by 
DURA to Spiros Corp. II.  Spiros Corp. II shall make such payment within 
fifteen (15) days after the delivery of such statement from DURA.  

     5.5  CALCULATION OF COSTS.  Direct Development Costs shall be allocated on
a reasonable and consistent basis, and charged to Spiros Corp. II for services
performed by DURA on behalf of Spiros Corp. II hereunder.  DURA's expenditures
and estimated expenditures for performing the Development hereunder shall be
determined using generally accepted accounting principles, consistent with
DURA's internal financial and accounting systems, allocated on a reasonable and
consistent basis.  Allocation of all Indirect Development Costs shall be made by
DURA on a reasonable basis consistent with DURA's regular internal cost
accounting system.

6.   REPRESENTATIONS, WARRANTIES AND COVENANTS.  The provisions of Section 3 of
the Technology Agreement with respect to DURA and Spiros Corp. II shall apply
with equal force and effect to this Agreement and are incorporated hereunder.  

7.   CONFIDENTIALITY.  The provisions of Sections 4.3 and 4.4 of the Technology
Agreement shall apply with equal force and effect to this Agreement and are
incorporated hereunder.

8.   DISCLAIMER OF WARRANTY; CONSEQUENTIAL DAMAGES.  The provisions of Section
5.3 of the Technology Agreement shall apply with equal force and effect to this
Agreement and are incorporated hereunder.

9.   INDEMNIFICATION AND INSURANCE.  

     9.1  INDEMNIFICATION.  The provisions of Section 6 of the Technology
Agreement shall apply with equal force and effect to this Agreement and are
incorporated hereunder.

     9.2  INSURANCE.

          9.2.1     INSURANCE BY SPIROS CORP. II.  To the extent Spiros Corp. II
develops or uses, or causes the development or use (except by DURA or its
Affiliates or subcontractors under this Agreement) of, the Spiros Products,
Spiros Corp. II shall, to the extent available at commercially reasonable rates,
maintain with insurers or underwriters of good repute such insurance relating to
the Development, and the sale and use of the Spiros Products, against such
risks, pursuant to such terms (including deductible limits or self-insured
retentions) and for such periods, as is customary for comparable businesses
undertaking the development, sale and use of products of a similar nature, and
shall, to the extent reasonably possible and not unreasonably expensive, cause
DURA, DDSI and Spiros Corp. to be named as additional insured parties on its
insurance policies.  To the extent Spiros Corp. II is required to obtain
insurance under this Section 9.2.1 during the term of this Agreement, Spiros
Corp. II may use Available Funds to pay the premiums therefor.

          9.2.2     INSURANCE BY DURA.  DURA shall, to the extent available at
commercially 

                                       -6-
<PAGE>

reasonable rates, maintain, with insurers or underwriters of good repute such 
insurance relating to the Development, against such risks and pursuant to 
such terms (including deductible limits or self-insured retentions) as is 
customary for comparable businesses undertaking research and development 
programs of a similar nature, and shall, to the extent reasonably possible 
and not unreasonably expensive, cause Spiros Corp. II to be named as an 
additional insured party on its insurance policies.

10.  TERM AND TERMINATION.

     10.1 TERM.  This Agreement shall be effective as of the date hereof and,
unless terminated earlier as provided in Sections 10.2, 10.3 and 10.4 hereof,
shall continue in full force and effect for the duration of the Development
Term.

     10.2 TERMINATION BY MUTUAL AGREEMENT.  By mutual agreement, the parties
hereto may at any time terminate this Agreement and the Development on mutually
acceptable terms.

     10.3 EFFECT OF PURCHASE OPTION EXERCISES.  

          10.3.1    PURCHASE OPTION.  In the event the Purchase Option is
exercised by DURA, this Agreement shall terminate, effective upon the Purchase
Option Closing Date, without any obligation to make payments pursuant to Section
7 of the Technology Agreement.

          10.3.2    PARTIAL TERMINATION UPON EXERCISE OF ALBUTEROL OPTION.  In
the event that the Albuterol Option is exercised as provided in the Albuterol
and Product Option Agreement, this Agreement shall terminate, effective on the
Albuterol Option Closing Date, with respect to the Albuterol Product, but shall
otherwise continue in full force and effect until terminated pursuant to this
Section 10.

          10.3.3    PARTIAL TERMINATION UPON EXERCISE OF PRODUCT OPTION.  In the
event that the Product Option is exercised as provided in the Albuterol and
Product Option Agreement, this Agreement shall terminate, effective on the
Product Option Closing Date, with respect to the Option Product but shall
otherwise continue in full force and effect until terminated pursuant to this
Section 10.

     10.4 TERMINATION FOR EVENT OF DEFAULT.  Either DURA or Spiros Corp. II
shall have the right to terminate this Agreement, effective as set forth in a
written notice to the othe party of the occurrence of an Event of Default with
respect to such other party.

     10.5 EFFECT OF TERMINATION.

          10.5.1    RETURN OF SPIROS PRODUCTS.  In the event of the termination
of DURA's right to continue Development of one or more Spiros Products pursuant
to Section 10.4 as a result of an Event of Default by DURA, DURA shall within
thirty (30) days of the effective date of such termination, transfer to Spiros
Corp. II all Program Technology and all other data, records and materials in
DURA's possession or control which relate to such Spiros Products.  DURA shall
also cooperate in the transfer of regulatory filings related to such Spiros
Products, and take such other 

                                       -7-
<PAGE>

actions and execute such other instruments, assignments and documents as may 
be necessary to effect the transfer of such Development rights to Spiros 
Corp. II.  

          10.5.2    CONTINUING OBLIGATION TO MAKE PAYMENTS.  Termination of this
Agreement shall not relieve the parties hereto of any liability, including any
obligation to pay any amounts payable by any party to another party which
accrued prior to such termination, nor preclude any party from pursuing all
rights and remedies it may have hereunder or at law or equity with respect to
any breach of this Agreement nor prejudice any party's right to obtain
performance of any obligation.

11.  MISCELLANEOUS.

     11.1 NO IMPLIED WAIVERS; RIGHTS CUMULATIVE.  No failure on the part of DURA
or Spiros Corp. II to exercise and no delay in exercising any right, power,
remedy or privilege under this Agreement or provided by statute or at law or in
equity or otherwise, including, without limitation, the right or power to
terminate this Agreement, shall impair, prejudice or constitute a waiver of any
such right, power, remedy or privilege or be construed as a waiver of any breach
of this Agreement or as an acquiescence therein, nor shall any single or partial
exercise of any such right, power, remedy or privilege preclude any other or
further exercise thereof or the exercise of any other right, power, remedy or
privilege.

     11.2 FORCE MAJEURE.  DURA and Spiros Corp. II shall each be excused for any
failure or delay in performing any of their respective obligations under this
Agreement, if such failure or delay is caused by Force Majeure.

     11.3 RELATIONSHIP OF THE PARTIES.  Nothing contained in this Agreement is
intended or is to be construed to constitute DURA and Spiros Corp. II as
partners or joint venturers or one party as an employee of any other party. 
Except as expressly provided herein, no party hereto shall have any express or
implied right or authority to assume or create any obligations on behalf of or
in the name of any other party or to bind any other party to any contract,
agreement or undertaking with any third party.

     11.4 NOTICES.  All notices, requests and other communications to DURA or 
Spiros Corp. II hereunder shall be in writing (including telecopy or similar 
electronic transmissions), shall refer specifically to this Agreement and 
shall be personally delivered or sent by telecopy or other electronic 
facsimile transmission or by registered mail or certified mail, return 
receipt requested and postage prepaid, or by reliable overnight courier 
service, in each case to the respective address specified below (or to such 
address as may be specified in writing to the other party hereto):

                                       -8-
<PAGE>

          If to DURA, addressed to:

          Dura Pharmaceuticals, Inc.
          7475 Lusk Boulevard
          San Diego, CA  92121
          Attention: President
           with a copy to the attention of General Counsel

          If to Spiros Corp. II, addressed to:

          Spiros Development Corporation II, Inc.
          7475 Lusk Boulevard
          San Diego, CA 92121
          Attention:  President

Any notice or communication given in conformity with this Section 12.4 shall be
deemed to be effective when received by the addressee, if delivered by hand,
telecopy or electronic transmission, three (3) days after mailing, if mailed and
one (1) business day after delivery to a reliable overnight courier service.

     11.5 FURTHER ASSURANCES.  Each of DURA and Spiros Corp. II hereby agrees to
duly execute and deliver, or cause to be duly executed and delivered, such
further instruments and do and cause to be done such further acts and things,
including, without limitation, the filing of such additional assignments,
agreements, documents and instruments, that may be necessary or as the other
party hereto may at any time and from time to time reasonably request in
connection with this Agreement or to carry out more effectively the provisions
and purposes of, or to better assure and confirm unto such other party its
rights and remedies under, this Agreement.  

     11.6 SUCCESSORS AND ASSIGNS.  The terms and provisions of this Agreement
shall inure to the benefit of, and be binding upon, DURA, Spiros Corp. II, and
their respective successors and assigns; PROVIDED, HOWEVER, that DURA and Spiros
Corp. II may not assign or otherwise transfer any of their respective rights and
interests, nor delegate any of their respective obligations, hereunder,
including, without limitation, pursuant to a merger or consolidation, without
the prior written consent of the other party hereto; PROVIDED FURTHER, HOWEVER,
that DURA may fully assign its rights and interests, and delegate its
obligations, hereunder, effective upon written notice thereof (a) to an
Affiliate if such Affiliate assumes all of the obligations of DURA hereunder and
this Agreement remains binding upon DURA; or (b) to any Person that acquires all
or substantially all of the assets of DURA, or which is the surviving Person in
a merger or consolidation with DURA, if such Person assumes all the obligations
of DURA hereunder.  Notwithstanding the foregoing, Spiros Corp. II shall have
the right to assign its rights and delegate its obligations hereunder following
expiration or termination (other than by exercise) of the Purchase Option.  
Notwithstanding the foregoing, Spiros Corp. II shall have the right to assign
its rights and delegate its obligations hereunder following expiration or
termination (other than by exercise) of the Purchase Option.  Any attempt to
assign or delegate any portion of this Agreement in violation of this Section
11.6 shall be null and void.  Subject to the foregoing any reference to DURA or
Spiros Corp. II hereunder shall be deemed to include the successors thereto and
assigns thereof.

                                       -9-
<PAGE>

     11.7 AMENDMENTS.  No amendment, modification, waiver, termination or
discharge of any provision of this Agreement, nor consent by DURA or Spiros
Corp. II to any departure therefrom, shall in any event be effective unless the
same shall be in writing specifically identifying this Agreement and the
provision intended to be amended, modified, waived, terminated or discharged and
signed by DURA and Spiros Corp. II, and each amendment, modification, waiver,
termination or discharge shall be effective only in the specific instance and
for the specific purpose for which given.  No provision of this Agreement shall
be varied, contradicted or explained by any other agreement, course of dealing
or performance or any other matter not set forth in an agreement in writing and
signed by DURA and Spiros Corp. II.

     11.8 GOVERNING LAW.  This Agreement shall be governed by and construed in
accordance with the laws of the State of California, as applied to contracts
made and performed entirely within the State of California.  Except as otherwise
provided herein, any claim or controversy arising out of or related to this
contract or any breach hereof shall be submitted to a court of competent
jurisdiction in the State of California, and the parties hereby consent to the
jurisdiction and venue of such court.

     11.9 SEVERABILITY. If any provision hereof should be held invalid, illegal
or unenforceable in any respect in any jurisdiction, then, to the fullest extent
permitted by law, (a) all other provisions hereof shall remain in full force and
effect in such jurisdiction and shall be liberally construed in order to carry
out the intentions of the parties hereto as nearly as may be possible and (b)
such invalidity, illegality or unenforceability shall not affect the validity,
legality or enforceability of such provision in any other jurisdiction.  To the
extent permitted by applicable law, DURA and Spiros Corp. II hereby waive any
provision of law that would render any provision hereof prohibited or
unenforceable in any respect.

     11.10  HEADINGS. Headings used herein are for convenience only and shall
not in any way affect the construction of, or be taken into consideration in
interpreting, this Agreement.

     11.11  COUNTERPARTS.  This Agreement may be executed in any number of
counterparts, each of which counterparts, when so executed and delivered, shall
be deemed to be an original, and all of which counterparts, taken together,
shall constitute one and the same instrument.

     11.12  ENTIRE AGREEMENT. This Agreement, together with any agreements
referenced herein, constitute, on and as of the date hereof, the entire
agreement of DURA and Spiros Corp. II with respect to the subject matter hereof,
and all prior or contemporaneous understandings or agreements, whether written
or oral, between DURA and Spiros Corp. II with respect to such subject matter
are hereby superseded in their entirety.

                [REMAINDER OF THIS PAGE INTENTIONALLY LEFT BLANK]

                                      -10-
<PAGE>

     IN WITNESS WHEREOF, the parties have executed this Agreement as of the date
first above written.

                              DURA PHARMACEUTICALS, INC.



                              By   /s/ Cam L. Garner
                                ----------------------------------------------
                                   Cam L. Garner 
                                   President and Chief Executive Officer


                                SPIROS DEVELOPMENT CORPORATION II, INC. 



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






















                    [SIGNATURE PAGE TO DEVELOPMENT AGREEMENT]
<PAGE>

                                  SCHEDULE 1.1

                                    GLOSSARY








                                  SCHEDULE 1.1
<PAGE>

                                  SCHEDULE 1.1

                                    GLOSSARY

     "AFFILIATE" of a person shall mean a Person that directly, or indirectly
through one or more intermediaries, controls, is controlled by or is under
common control with such Person.  "Control" (and, with correlative meanings, the
terms "controlled by" and "under common control with") shall mean the possession
of the power to direct or cause the direction of the management and policies of
such Person, whether through the ownership of voting stock, by contract or
otherwise.  In the case of a corporations, "control" shall mean, among other
things, the direct or indirect ownership of more than fifty percent (50%) of its
outstanding voting stock.

     "AGREEMENTS" shall mean the Manufacturing and Marketing Agreement, the
Technology Agreement and the Development Agreement.  

     "ALBUTEROL OPTION" shall have the meaning assigned to it in Section 1.1 of
the Albuterol and Product Option Agreement.

     "ALBUTEROL AND PRODUCT OPTION AGREEMENT" shall mean the Albuterol and
Product Option Agreement dated as of December 22, 1997, between DURA and Spiros
Corp. II, as amended, modified or supplemented from time to time.

     "ALBUTEROL OPTION CLOSING DATE" shall have the meaning assigned to it in
Section 1.5 of the Albuterol and Product Option Agreement.

     "ALBUTEROL PROGRAM ASSETS" shall have the meaning assigned to it in Section
1.1 of the Albuterol and Product Option Agreement.

     "ALBUTEROL PRODUCT" shall have the meaning assigned to it in Section 1.1 of
the Albuterol and Product Option Agreement.

     "AVAILABLE FUNDS" shall mean the sum of (a) the net proceeds to Spiros 
Corp. II from the sale of the Units in the Offering and the Contribution, (b) 
all royalties or fees remitted to Spiros Corp. II by DURA (or its Affiliates) 
from the Sale of Spiros Products or in consideration of license rights 
granted pursuant to the Agreements, (c) the Option Proceeds, if any, (d) any 
other amounts provided by DURA to Spiros Corp. II, if any and (e) interest or 
other income earned through temporary investment of the amounts described in 
clauses (a), (b), (c) or (d). 

     "BANKRUPTCY CODE" shall mean the United States Bankruptcy Code, as amended
from time to time.

     "CLAIM" shall mean any and all liabilities, damages, losses, settlements,
claims, actions, suits, penalties, fines, costs or expenses (including, without
limitation, reasonable attorneys' fees).

                                  SCHEDULE 1.1
<PAGE>

     "CONFIDENTIAL INFORMATION" shall mean all Program Technology disclosed by
DURA (and its Affiliates) to Spiros Corp. II or by Spiros Corp. II to DURA
pursuant to the Agreements or the Services Agreement.

     "CONTRIBUTION" shall have the meaning assigned in Section 5.2 of the
Development Agreement.

     "CORE TECHNOLOGY" shall mean the DURA Core Technology, the DDSI Core
Technology and the Spiros Core Technology.

     "DDSI CORE TECHNOLOGY" shall mean (a) Technology owned or controlled by
DDSI as of the date of the closing of the Offering necessary or useful to the
development of the Spiros Products, and (b) the DDSI Patent Rights; PROVIDED,
HOWEVER, that DDSI Core Technology shall also include Technology acquired by
DDSI from a third party after the date of the closing of the Offering necessary
or useful to the development of the Spiros Products, except to the extent that
there are any limitations or restrictions on DDSI's ability to license or
sublicense such Technology.  "Owned or controlled" shall include Technology that
DDSI owns, or under which DDSI is licensed and has the right to grant
sublicenses and/or grant immunity from suit.

     "DDSI INDEMNITEE" shall mean DDSI, its successors and assigns, and the
directors, officers, employees, agents and counsel thereof.

     "DDSI PATENT RIGHTS" shall mean those certain inventions described in
claims of (a) the patent applications pending, filed by DDSI (or the rights to
which have been assigned to DDSI) as of the date of the Technology Agreement
relating to dry powder inhalers, powder storage systems and/or formulation
methods for dry powder inhalation, (b) any patent application constituting an
equivalent, counterpart, reissue, extension or continuation (including, without
limitation, a continuation in part or a subdivision) of any of the foregoing
patent applications and (c) any patent issued or issuing upon any of the
foregoing.

     "DESIGNATED COMPOUND(S)" shall mean any compounds for delivery using the
System selected by Spiros Corp. II, and agreed to be developed by DURA.

     "DEVELOPED TECHNOLOGY" shall mean any Technology including, without
limitation, any enhancements, substitutions or improvements to the Core
Technology that is (a) discovered, developed or otherwise acquired by DURA
pursuant to the terms of the Development Agreement or (b) otherwise acquired by
or on behalf of Spiros Corp. II during the term of the Development Agreement.

     "DEVELOPMENT" shall mean the further development of the Program Technology
for the purpose of identifying, developing, manufacturing, marketing and
commercializing Spiros Products and 

                                  SCHEDULE 1.1
<PAGE>

the making of the Other Expenditures.

     "DEVELOPMENT AGREEMENT" shall mean the Development Agreement dated as of 
December 22, 1997, between DURA and Spiros Corp., as amended, modified or 
supplemented from time to time.

     "DEVELOPMENT COSTS" shall mean the Direct Development Costs, the Indirect
Development Costs and the Other Expenditures.

     "DEVELOPMENT TERM" shall mean the period commencing on the Closing Date and
ending on the earlier of (a) the Option Closing Date or (b) the date the Option
terminates or expires other than by exercise.

     "DIRECT DEVELOPMENT COSTS" shall mean all costs incurred by DURA or its 
Affiliates in respect of the Development, other than Indirect Development 
Costs, determined in accordance with generally accepted accounting principles 
consistent with DURA's internal accounting system, allocated on a reasonable 
and consistent basis.  Direct Development Costs shall consist primarily of 
fully-burdened payroll costs (burdened to include benefits, payroll taxes and 
an allocation of facilities and overhead costs) and any other such costs 
generated internally by DURA in respect of the Development.

     "DPI" shall mean the motor-driven dry powder inhaler (other than an inahler
designed to deliver a single dose of a drug) developed by DURA, DDSI and/or
Spiros Corp. and to be developed by DURA and/or Spiros Corp. II.

     "DURA COMMON STOCK" shall mean the Common Stock of DURA, par value $.001
per share.  

     "DURA CORE TECHNOLOGY" shall mean (a) Technology owned or controlled by
DURA as of the date of the closing of the Offering necessary or useful to the
development of the Spiros Products, and (b) the DURA Patent Rights and DURA
Trademarks; PROVIDED, HOWEVER, that DURA Core Technology shall also include
Technology acquired by DURA from a third party after the date of the closing of
the Offering necessary or useful to the development of the Spiros Products,
except to the extent that there are any limitations or restrictions on DURA's
ability to license or sublicense such Technology.  "Owned or controlled" shall
include Technology that DURA owns, or under which DURA is licensed and has the
right to grant sublicenses and/or grant immunity from suit.

     "DURA INDEMNITEE" shall mean DURA, its successors and assigns, and the
directors, officers, employees, agents and counsel thereof.

     "DURA PATENT RIGHTS" shall mean those certain inventions described in
claims of (a) the patent applications pending, filed by DURA (or the rights to
which have been assigned to DURA) as of the date of the Technology Agreement
relating to DPIs, PSSs and/or formulation methods for dry powder inhalation, (b)
any 

                                  SCHEDULE 1.1
<PAGE>

patent application constituting an equivalent, counterpart, reissue, 
extension or continuation (including, without limitation, a continuation in 
part or a subdivision) of any of the foregoing patent applications and (c) 
any patent issued or issuing upon any of the foregoing.

     "DURA TRADEMARKS" shall mean SpirosTM.

     "EVENT OF DEFAULT" shall mean any of the following events:  (a) at any
time, if DURA or Spiros Corp. II fails to perform or observe or otherwise
breaches any of its Material Obligations, and such failure or breach continues
unremedied for a period of sixty (60) days after receipt by of written notice
thereof from the other party; (b) at any time, effective as set forth in a
written notice from the other party if DURA or Spiros Corp. II shall (i) seek
the liquidation, reorganization, dissolution or winding-up of itself or the
composition or readjustment of its debts (other than pursuant to a merger with
an Affiliate), (ii) apply for or consent to the appointment of, or the taking
possession by, a receiver, custodian, trustee or liquidator for itself or of all
or a substantial part of its assets, (iii) make a general assignment for the
benefit of its creditors, (iv) commence a voluntary case under the Bankruptcy
Code, (v) file a petition seeking to take advantage of any other law relating to
bankruptcy, insolvency, reorganization, winding-up or composition or
readjustment of debts (other than pursuant to a merger with an Affiliate) or
(vi) adopt any resolution of its Board of Directors or shareholders for the
purpose of effecting any of the foregoing (other than pursuant to a merger with
an Affiliate); or (c) at any time, effective as set forth in a written notice
from the other party, if a proceeding or case shall be commenced without the
application or consent of DURA or Spiros Corp. II as applicable, and such
proceeding or case shall continue undismissed, or an order, judgment or decrees
approving or ordering any of the following shall be entered and continued
unstayed and in effect, for a period of sixty (60) days from and after the date
service of process is effected, seeking (i) DURA's or Spiros Corp. II's, as
applicable, liquidation, reorganization, dissolution or winding-up, or the
composition or readjustment of its debts, (ii) the appointment of a trustee,
receiver, custodian, liquidator or the like of DURA or Spiros Corp. II or for
all or any substantial part of its assets or (iii) similar relief in respect of
DURA or Spiros Corp. II under any law relating to bankruptcy, insolvency,
reorganization, winding-up or the composition or readjustment of debts.

     "FDA" shall mean the United States Food and Drug Administration or any
successor agency or authority, the approval of which is required to market
health care products in the United States.

     "FDA APPROVAL" shall mean the final regulatory approval of the FDA required
to commence commercial marketing of a health product.

                                  SCHEDULE 1.1
<PAGE>

     "FORCE MAJEURE" shall mean any act of God, any accident explosion, fire,
storm, earthquake, flood, drought, peril of the sea, riot, embargo, war or
foreign, federal, state or municipal order of general application, seizure,
requisition or allocation, any failure or delay of transportation, shortage of
or inability to obtain supplies, equipment, fuel or labor or any other
circumstance or event beyond the reasonable control of the party relying upon
such circumstance or event.

     "INDIRECT DEVELOPMENT COSTS" shall mean all costs, fees and out-of-pocket
or other expenses, including the purchase of any capital equipment related to
the Development, incurred or paid by DURA to a third party, other than an
Affiliate of DURA, in respect of the Development, determined in accordance with
generally accepted accounting principles consistent with DURA's internal
accounting system, allocated on a reasonable and consistent basis.

     "MANUFACTURING AND MARKETING AGREEMENT" shall mean the Manufacturing and
Marketing Agreement dated as of December 22, 1997 between DURA and Spiros Corp.
II, as amended, modified or supplemented from time to time.

     "MANUFACTURE" shall mean the manufacture and assembly of the Spiros
Products.

     "MATERIAL OBLIGATION" shall mean the material obligations of a party under
the Technology Agreement, the Development Agreement or the Manufacturing and
Marketing Agreement.

     "NET SALES" shall mean the gross amount invoiced for sales of Spiros
Products by DURA or its sublicensees, if any, to third parties less (i)
discounts actually allowed, (ii) credits for claims, allowances, retroactive
price reductions or returned Spiros Products, (iii) prepaid freight charges
incurred in transporting Spiros Products to customers, (iv) sales taxes and
other governmental charges actually paid in connection with the sales (but
excluding what is commonly known as income taxes) and (v) any royalty
obligations under the 1993 Royalty Agreement.  Net Sales shall not include sales
between or among DURA, its Affiliates and its sublicensees unless such sales are
for end use rather than for purposes of resale.

     "OFFERING" shall mean the underwritten public offering of the Units
pursuant to the Registration Statement.

     "OPTION PROCEEDS" shall have the meaning assigned to it in Section 3 of the
Albuterol and Product Option Agreement. 

     "OPTION PRODUCT" shall have the meaning assigned to it in Section 2.1 of
the Albuterol and Product Option Agreement.

     "OTHER EXPENDITURES" shall mean funds spent by Spiros Corp. II to acquire
capital equipment, develop a next generation inhaler system or to enhance the
System.

                                  SCHEDULE 1.1
<PAGE>


     "PATENT RIGHTS" shall mean any patents or patent applications within the
Spiros Corp. II Patent Rights, the DURA Patent Rights, the DDSI Patent Rights
and the Spiros Corp. Patent Rights.

     "PERSON" shall mean any individual, partnership, corporation, firm,
association, unincorporated organization, joint venture, trust or other entity.

     "PRODUCT OPTION" shall have the meaning assigned to it in Section 2.1 of
the Albuterol and Product Option Agreement. 

     "PRODUCT OPTION CLOSING DATE" shall have the meaning assigned to it in
Section 2.5 of the Albuterol and Product Option Agreement.

     "PROGRAM TECHNOLOGY" shall mean the Core Technology and the Developed
Technology.

     "PSS" shall mean the powder storage system developed and to be developed by
DURA for use with the DPI.

     "PURCHASE AGREEMENT" shall mean the Purchase Agreement dated as of
December 16, 1997, among DURA, Spiros Corp. II, Merrill Lynch & Co., and
Donaldson, Lufkin & Jenrette.  

     "PURCHASE OPTION" shall mean the option granted to the holder of Spiros
Corp. II's Special Common Stock to purchase all of the Spiros Corp. II Common
Stock as set forth in Article V of the Spiros Corp. II Charter.

     "PURCHASE OPTION CLOSING DATE" shall have the meaning assigned to it in
Article V of the Spiros Corp. II Charter.

     "PURCHASE OPTION EXERCISE PRICE" shall have the meaning assigned to it in
Article V of the Spiros Corp. II Charter 

     "REGISTRATION STATEMENT" shall mean the Registration Statement on Form S-
1/S-3 filed by Spiros Corp. II and DURA dated October 10, 1997 (No. 333-37673/
333-37673-01), including all exhibits and any amendments thereof
and supplements thereto.

     "RESEARCH FUNDS" shall mean the Available Funds, less (i) all general and
administrative expenses including, without limitation, those paid or payable
pursuant to the Development Agreement or the Services Agreement, and the
reasonable out-of-pocket expenses of Spiros Corp. II directors and reasonable
compensation for Spiros Corp. II's independent directors, less (ii) any amounts
paid to DURA under the Development Agreement or the Services Agreement, less
(iii) any costs and expenses incurred in the defense or settlement of any action
or claim or in respect of a judgment thereon, and less (iv) One Million Dollars
($1,000,000) to be retained by Spiros Corp. II as working capital in the event
DURA does not exercise the Purchase Option.

                                  SCHEDULE 1.1
<PAGE>

     "SALE(S)" or "SELL" shall mean the activity undertaken by a sales
representative during a sales call on physicians, physician assistants, nurses,
hospitals, clinics, health maintenance organizations, preferred provider
organizations and managed care companies (including all forms of communication
not involving face to face contact by such sales representatives), describing
the FDA-approved indicated uses, safety, effectiveness, contraindications, side
effects, warnings and other relevant characteristics of the Spiros Product, in a
fair and balanced manner consistent with the requirements of the Federal Food,
Drug, and Cosmetic Act, as amended (and the regulations thereunder).  

     "SPIROS CASSETTE SYSTEM" shall mean a DPI in which the PSS is in the form
of a cassette.

     "SPIROS CORE TECHNOLOGY" shall mean (a) Technology owned or controlled by
Spiros Corp. as of the date of the closing of the Offering necessary or useful
to the development of the Spiros Products, and (b) the Spiros Corp. Patent
Rights; PROVIDED, HOWEVER, that Spiros Core Technology shall also include
Technology acquired by Spiros Corp. from a third party after the date of the
closing of the Offering necessary or useful to the development of the Spiros
Products, except to the extent that there are any limitations or restrictions on
Spiros Corp.'s ability to license or sublicense such Technology.  "Owned or
controlled" shall include Technology that Spiros Corp. owns, or under which
Spiros Corp. is licensed and has the right to grant sublicenses and/or grant
immunity from suit.

     "SPIROS CORP. INDEMNITEE" shall mean Spiros Corp., its successors and
assigns, and the directors, officers, employees, agents and counsel thereof.  

     "SPIROS CORP. PATENT RIGHTS" shall mean those certain inventions described
in claims of (a) the patent applications pending, filed by Spiros Corp. (or the
rights to which have been assigned to Spiros Corp.) as of the date of the
Technology Agreement relating to dry powder inhalers, powder storage systems
and/or formulation methods for dry powder inhalation, (b) any patent application
constituting an equivalent, counterpart, reissue, extension or continuation
(including, without limitation, a continuation in part or a subdivision) of any
of the foregoing patent applications and (c) any patent issued or issuing upon
any of the foregoing.

     "SPIROS CORP. II CHARTER" shall mean Amended and Restated Certificate of
Spiros Development Corporation II, Inc. in effect as of the closing of the
Offering, as amended from time to time.

     "SPIROS CORP. II COMMON STOCK" shall mean the Callable Common Stock of
Spiros Corp. II, $.001 par value.

     "SPIROS CORP. II INDEMNITEE" shall mean Spiros Corp. II, its 

                                  SCHEDULE 1.1
<PAGE>

successors and assigns, and the directors, officers, employees, agents and 
counsel thereof.

     "SPIROS CORP. II PATENT RIGHTS" shall mean those certain inventions
described in claims of (a) any patent application having one or more claims
covering Developed Technology, (b) any patent application constituting an
equivalent, counterpart, reissue, extension or continuation (including, without
limitation, a continuation in part or a subdivision) of any of the foregoing
applications or (c) any patent issued or issuing upon any of the foregoing
applications.

     "SPIROS PRODUCT(S)" shall mean (a) any System used with a formulation of
albuterol, beclomethasone, ipratropium, an albuterol-ipratropium combination,
budesonide or a Designated Compound developed, produced, manufactured or
marketed by DURA on behalf of Spiros Corp. II using the Program Technology.

     "SPIROS PRODUCT PROGRAM ASSETS" shall have the meaning assigned to it in
Section 2.1 of the Albuterol and Product Option Agreement.

     "SYSTEM" shall mean the DPI and the PSS when used together.

     "TECHNOLOGY" shall mean, solely with respect to motor-driven dry powder
inhalers and powder storage systems for drugs for delivery through such
inhalers, the manufacture thereof, and formulations of drugs to be delivered
through such inhalers, public and nonpublic technical or other information,
trade secrets, know-how, processes, formulations, concepts, ideas, preclinical,
clinical, pharmacological or other data and testing results, experimental
methods, or results, assays, descriptions, business or scientific plans,
depictions, customer lists and any other written, printed or electronically
stored materials, pharmaceutical compounds or any other natural or man-made
pharmaceutical materials and any and all other intellectual  property, including
patents and patent applications, of any nature whatsoever.  The term
"Technology" shall include, without limitation, any of the foregoing as it
relates to enhancements of, substitutions for or improvements to the Core
Technology.

     "TECHNOLOGY AGREEMENT" shall mean the Technology License Agreement dated as
of December 22, 1997, among DURA, DDSI, Spiros Corp. and Spiros Corp. II, as
amended, modified or supplemented from time to time.

     "TERRITORY" shall mean the entire world.
     
     "UNDERWRITERS" shall have the meaning assigned to it in the Registration
Statement.

     "UNITS" shall mean units, each consisting of one share of Spiros Corp. II
Common Stock and one warrant to purchase one-fourth of one share of DURA Common
Stock, all as described in the Registration Statement.

                                  SCHEDULE 1.1
<PAGE>

     "1993 ROYALTY AGREEMENT" shall have the meaning assigned to it in the
Registration Statement.


<PAGE>

                                  SCHEDULE 2.1


                          Proposed Budget and Workplan
<TABLE>
<CAPTION>
                                                                      Year ended December 31,
                                                                           (in millions)
                                                   -----------------------------------------------------------
                                                   (3 months)                               (4 months)
                                                     1997(2)     1998      1999      2000      2001     Total
                                                   ----------   ------     -----     -----     -----    ------
<S>                                                <C>          <C>        <C>       <C>       <C>      <C>
Beginning cash balance . . . . . . . . . . . . . .    $ --      $151.7     $95.8     $45.9     $12.4    $ --
Dura Contribution. . . . . . . . . . . . . . . . .      75.0      --        --        --        --        75.0
Net proceeds of the Offerings. . . . . . . . . . .      81.7      --        --        --        --        81.7
Interest income(1) . . . . . . . . . . . . . . . .      --         6.0       3.5       1.4       0.3      11.2
                                                      ------    ------     -----     -----     -----    ------
     Total . . . . . . . . . . . . . . . . . . . .    $156.7    $157.7     $99.3     $47.3     $12.7    $167.9
                                                      ------    ------     -----     -----     -----    ------
                                                      ------    ------     -----     -----     -----    ------
Payments
   Albuterol . . . . . . . . . . . . . . . . . . .       3.4      30.3      --        --        --        33.7
   Beclomethasone. . . . . . . . . . . . . . . . .       1.6       9.1       6.0       0.3      --        17.0
   Budesonide. . . . . . . . . . . . . . . . . . .      --         4.6      15.2      11.1       6.3      37.2
   Ipratropium . . . . . . . . . . . . . . . . . .      --         9.5      16.1       9.0      --        34.6
   Albuterol-Ipratropium . . . . . . . . . . . . .      --         6.5      11.2      10.1       3.0      30.8
Other Expenditures . . . . . . . . . . . . . . . .      --         1.5       4.5       4.0       2.0      12.0
General and administrative expenses. . . . . . . .      --         0.4       0.4       0.4       0.4       1.6
                                                      ------    ------     -----     -----     -----    ------
     Total . . . . . . . . . . . . . . . . . . . .    $  5.0    $ 61.9     $53.4     $34.9     $11.7    $166.9
                                                      ------    ------     -----     -----     -----    ------
                                                      ------    ------     -----     -----     -----    ------
Ending cash balance  . . . . . . . . . . . . . . .    $151.7    $ 95.8     $45.9     $12.4     $ 1.0    $  1.0
                                                      ------    ------     -----     -----     -----    ------
                                                      ------    ------     -----     -----     -----    ------
</TABLE>
- ------------------------
(1)  Assumes an interest rate of 5%.

(2)  Expenditures in the year ended December 31, 1997 include approximately $4
     million to repay Dura for estimated costs and expenses to be incurred by
     Dura on behalf of Spiros Corp. II between October 10, 1997 and the closing
     of the Offerings.

<PAGE>

                                  SCHEDULE 5.3


Contracting for Development services through closing.

     Dry powder inhaler and drug development costs through closing of the
     Offering.







                                  SCHEDULE 5.3


<PAGE>


                     ALBUTEROL AND PRODUCT OPTION AGREEMENT



     This ALBUTEROL AND PRODUCT OPTION AGREEMENT, is dated as of December 22,
1997, by and between DURA PHARMACEUTICALS, INC., a Delaware corporation
("DURA"), and SPIROS DEVELOPMENT CORPORATION II, INC., a Delaware corporation
("Spiros Corp II").

                                    RECITALS

     A.   DURA and Spiros Development Corporation, a Delaware corporation
("Spiros Corp.") are parties to the Agreements as hereinafter defined.  Except
where the context requires otherwise, capitalized terms used but not defined
herein shall have the respective meanings assigned to them in the Glossary
attached as SCHEDULE 1.1 to this Agreement.

     B.   Pursuant to the Technology Agreement, each of DURA and Spiros Corp.
have granted to Spiros Corp. II, and Spiros Corp. II has acquired from each of
DURA and Spiros Corp., an exclusive license to certain patent rights and
technology for the purpose of allowing Spiros Corp. II to develop and
commercialize Spiros Products.

     C.   As a condition to entering into the Agreements, and in partial
consideration of the Contribution, DURA desires to receive from Spiros Corp. II,
and Spiros Corp. II is willing to grant to DURA, an option to acquire the
Albuterol Program Assets (defined in Section 1.1 below), pursuant to the terms
of this Agreement.

     D.   As a further condition to entering into the Agreements, and in partial
consideration of the Contribution, DURA desires to receive from Spiros Corp. II,
and Spiros Corp. II is willing to grant to DURA, an option to acquire the Spiros
Product Program Assets (defined in Section 2.1 below), pursuant to the terms of
this Agreement.

     NOW, THEREFORE, in consideration of the mutual covenants set forth herein
and for other good and valuable consideration, the receipt and sufficiency of
which are hereby acknowledged, DURA and Spiros Corp. II hereby agree as follows:

1.   ALBUTEROL OPTION

     1.1  GRANT OF ALBUTEROL OPTION.  Subject to the terms and conditions of
this Agreement, Spiros Corp. II hereby grants to DURA an option (the "Albuterol
Option") to acquire, for all purposes, medical uses and indications without any
limitation imposed by Spiros Corp. II, all of Spiros Corp. II's right, title and
interest in and to the following (the "Albuterol Program Assets"):  (a) the
product developed by DURA pursuant to the Development Agreement with albuterol 
in the Spiros Cassette System (the "Albuterol Product"), (b) albuterol as 
formulated for use in the Albuterol Product, (c) a perpetual, sublicensable, 
non-exclusive, royalty-free license to the technology owned by Dura or developed
or acquired by Dura during the term of the Development 

<PAGE>

Agreement applicable to the Albuterol Product for use solely with the Albuterol
Product, and (d) all applications and documents filed with the FDA or any other
regulatory body to obtain regulatory approval to commence commercial sale or use
of the Albuterol Product.  The tangible manifestations of the Albuterol Program 
Assets shall be delivered to DURA promptly following the Albuterol Option 
Closing Date (defined in Section 1.5 below).

     1.2  ALBUTEROL OPTION PERIOD.  Subject to earlier termination pursuant 
to Section 8 hereof, the Albuterol Option is exercisable commencing on the 
date of this Agreement and ending (the "Albuterol Option Termination Date") 
at 11:59 p.m., San Diego time, on the earlier of (a) three hundred and sixty 
(360) days after receipt of FDA Approval of the Albuterol Product or (b) the 
date following the commencement of Manufacture of the Albuterol Product 
pursuant to the Manufacturing and Marketing Agreement upon which Dura ceases 
to manufacture or market the Albuterol Product in accordance with the terms 
of the Manufacturing and Marketing Agreement.  If the Albuterol Option 
Termination Date is not a business day, then the Albuterol Option Termination 
Date shall be 11:59 p.m., San Diego time, on the next succeeding business day.

     1.3  EXERCISE PRICE.  Upon exercise of the Albuterol Option, DURA shall 
make a single payment (the "Albuterol Option Exercise Price") to Spiros Corp. 
II equal to (a) the aggregate Purchase Option Exercise Price, assuming 
acquisition of all shares of Spiros Corp. II Common Stock issued pursuant to 
the Offering four years following the date of closing of the Offering, 
multiplied by (b) a fraction, the numerator of which will equal the 
development and commercialization costs and expenses incurred by Spiros Corp. 
II in connection with the development and commercialization of the Albuterol 
Product and the denominator of which will equal $ 167,900,000 plus the net 
proceeds to DURA, if any, from the exercise by of the over-allotment option 
described in the Registration Statement by the Underwriters in connection 
with the Offering.

     1.4  FORM OF PAYMENT.  The Albuterol Option Exercise Price shall be paid in
cash, by certified or bank cashier's check (or wire transfer) made payable to
Spiros Corp. II.

     1.5  MANNER OF EXERCISE.  The Albuterol Option may be exercised at any time
during the Albuterol Option Period by written notice (the "Albuterol Purchase
Exercise Notice") to Spiros Corp. II, signed by an executive officer of DURA,
stating that the Albuterol Option is being exercised and setting forth: (a) the
estimated Albuterol Option Exercise Price as determined in accordance with
Section 1.3 hereof; and (b) a closing date, not less than twenty (20) nor more
than sixty (60) days after the date of such notice (the "Albuterol Option
Closing Date"), on which the Albuterol Program Assets shall be purchased.

     1.6  ALBUTEROL OPTION CLOSING DATE.

          (a)    At the closing of the Albuterol Option on the Albuterol Option
Closing Date, (i) Spiros Corp. II shall deliver to DURA such documents, bills of
sale, licenses, sublicenses, further instruments of transfer and assignment and
other papers and take such further actions as may be reasonably required or
desirable to effect the transfer of the Albuterol Program Assets contemplated
hereby, and (ii) DURA shall deliver to Spiros Corp. II a certified or bank
cashier's check (or wire transfer) in the amount of the Albuterol Option
Exercise Price.


                                       -2-

<PAGE>

          (b)   Transfer of all Albuterol Program Assets to DURA shall be deemed
to occur automatically on the Albuterol Option Closing Date, subject to the
provisions of Section 5 hereof. Notwithstanding any other provision of this
Agreement, with respect to any rights held by Spiros Corp. II pursuant to an
agreement with any person other than DURA, which rights relate to the Albuterol
Program Assets, the rights granted to DURA hereunder shall be limited to the
rights which Spiros Corp. II has a right to assign or grant under such agreement
and shall be subject to any obligations assumed by Spiros Corp. II in
consideration of the grant or assignment of such rights to Spiros Corp. II,
including all obligations to pay any license fees and royalties with respect to
the Albuterol Program Assets (such assumed obligations being referred to herein
as the "Assumed Albuterol Obligations"); PROVIDED, HOWEVER, that Spiros Corp. II
shall use commercially reasonable efforts to obtain the right to grant
sublicenses or assign such rights on terms reasonably acceptable to DURA.

2.   PRODUCT OPTION

     2.1  GRANT OF PRODUCT OPTION.  Subject to the terms and conditions of this
Agreement, Spiros Corp. II hereby grants to DURA an option (the "Product
Option") to acquire, for all purposes, medical uses and indications without any
limitation imposed by Spiros Corp. II, all of Spiros Corp. II's right, title and
interest in and to the following (the "Spiros Product Program Assets"):  (a) a
single Spiros Product (other than the Albuterol Product) developed by DURA
pursuant to the Development Agreement for which DURA determines to exercise the
Product Option (the "Option Product"), (b) the compound to be delivered by the
Option Product, as formulated for use specifically in the Option Product, (c) a
perpetual, sublicensable, non-exclusive, royalty-free license to the technology
owned by Dura or developed or acquired by Dura during the term of the
Development Agreement applicable to the Option Product for use solely with the
Option Product, and (d) all applications and documents filed with the FDA or any
other regulatory body to obtain regulatory approval to commence commercial sale
or use of the Option Product.  The tangible manifestations of the Spiros Product
Program Assets shall be delivered to DURA promptly following the Product Option
Closing Date (as defined in Section 2.5 below).

     2.2  PRODUCT OPTION PERIOD.  Subject to earlier termination pursuant to 
Section 8 hereof, the Product Option is exercisable with respect to each 
Spiros Product commencing on the date of this Agreement and ending (the 
"Product Option Termination Date") at 11:59 p.m., San Diego time, ninety (90) 
days after receipt of FDA Approval of such Spiros Product.  If the Product 
Option Termination Date is not a business day, then the Product Option 
Termination Date shall be 11:59 p.m., San Diego time, on the next succeeding 
business day.

     2.3  EXERCISE PRICE.  Upon exercise of the Product Option, DURA shall make
a single payment (the "Product Option Exercise Price") to Spiros Corp. II, of
one hundred and ten percent (110%) of (a) the aggregate Purchase Option Exercise
Price, assuming acquisition of all shares of Spiros Corp. II Common Stock issued
pursuant to the Offering four years following the date of closing of the
Offering, multiplied by (b) a fraction, the numerator of which will equal the
development and commercialization costs and expenses incurred by Spiros Corp. II
in connection


                                       -3-

<PAGE>

with the development and commercialization of the Option Product and the 
denominator of which will equal $167,900,000 plus the net proceeds to DURA, 
if any, from the exercise by of the over-allotment option described in the 
Registration Statement by the Underwriters in connection with the Offering.

     2.4  FORM OF PAYMENT.  The Product Option Exercise Price shall be paid in
cash, by certified or bank cashier's check (or wire transfer) made payable to
Spiros Corp. II.

     2.5  MANNER OF EXERCISE.  The Product Option may be exercised at any time
during the Product Option Period by written notice (the "Product Purchase
Exercise Notice") to Spiros Corp. II, signed by an executive officer of DURA,
stating that the Product Option is being exercised and setting forth: (a) the
Spiros Product to be designated as the Option Product; (b) the estimated Product
Option Exercise Price as determined in accordance with Section 2.3 hereof; and
(c) a closing date, not less than twenty (20) nor more than sixty (60) days
after the date of such notice (the "Product Option Closing Date"), on which the
Spiros Product Program Assets shall be purchased.

     2.6  PRODUCT OPTION CLOSING DATE.

          (a)    At the closing of the Product Option on the Product Option
Closing Date, (i) Spiros Corp. II shall deliver to DURA such documents, bills of
sale, licenses, sublicenses, further instruments of transfer and assignment and
other papers and take such further actions as may be reasonably required or
desirable to effect the transfer of the Spiros Product Program Assets
contemplated hereby, and (ii) DURA shall deliver to Spiros Corp. II a certified
or bank cashier's check (or wire transfer) in the amount of the Product Option
Exercise Price.

          (b)   Transfer of all Spiros Product Program Assets to DURA shall be
deemed to occur automatically on the Product Option Closing Date, subject to the
provisions of Section 5 hereof. Notwithstanding any other provision of this
Agreement, with respect to any rights held by Spiros Corp. II pursuant to an
agreement with any person other than DURA, which rights relate to the Spiros
Product Program Assets, the rights granted to DURA hereunder shall be limited to
the rights which Spiros Corp. II has a right to assign or grant under such
agreement and shall be subject to any obligations assumed by Spiros Corp. II in
consideration of the grant or assignment of such rights to Spiros Corp. II,
including all obligations to pay any license fees and royalties with respect to
the Spiros Product Program Assets (such assumed obligations being referred to
herein as the "Assumed Option Product Obligations"); PROVIDED, HOWEVER, that
Spiros Corp. II shall use commercially reasonable efforts to obtain the right to
grant sublicenses or assign such rights on terms reasonably acceptable to DURA.

3.   DISPOSITION OF ALBUTEROL OPTION EXERCISE PRICE AND PRODUCT OPTION EXERCISE
PRICE.  Until the expiration or termination of the Technology Agreement, the
Development Agreement or the Manufacturing and Marketing Agreement, at which
time all proceeds of the Albuterol Option Exercise Price and Product Option
Exercise Price (together with any interest, dividends and other earnings
thereon, the "Option Proceeds") received by Spiros Corp. II will become
unrestricted as to disposition or use by Spiros Corp. II, the Option Proceeds
shall be deemed Available Funds and shall not be otherwise expended, used,
encumbered or distributed.


                                       -4-

<PAGE>

4.   REPRESENTATIONS, WARRANTIES AND COVENANTS.  The provisions of Section 3 of
the Technology Agreement shall apply with equal force and effect to this
Agreement and are incorporated hereunder.

5.   CONDITIONS TO ALBUTEROL OR PRODUCT OPTION CLOSING.

     5.1  CONDITIONS TO OBLIGATIONS OF DURA.  The obligations of DURA to
consummate the transactions contemplated by this Agreement following exercise of
the Albuterol Option or the Product Option shall be subject, at DURA's option,
to the fulfillment at or prior to the Albuterol Closing Date or Product Option
Closing Date, as the case may be, of each of the following conditions:

          (a)    Spiros Corp. II shall have duly executed and delivered to DURA
each of the documents, certificates and other items provided in Section
1.6(a)(i), in the case of the exercise of the Albuterol Option, and Section
2.6(a)(i), in the case of the exercise of the Product Option, of this Agreement
to the reasonable satisfaction of DURA and its counsel.

          (b)    The representations and warranties made by Spiros Corp. II 
in Section 3.1 of the Technology Agreement shall be true and correct in all 
material respects on and as of the Albuterol Option Closing Date or the 
Product Option Closing Date, as the case may be, with the same effect as 
though such representations and warranties had been made or given on and as 
of such date, and Spiros Corp. II shall have performed and complied in all 
material respects with all of Spiros Corp. II's obligations under this 
Agreement which are to be performed or complied with by it on or prior to the 
Albuterol Option Closing Date or the Product Option Closing Date, as the case 
may be.

          (c)    No action, suit or other proceeding before a court, tribunal or
other governmental agency or body shall have been instituted or threatened to
restrain or prohibit the consummation of the transactions contemplated by this
Agreement, or seeking to obtain substantial damages in respect thereof, or
involving a claim that consummation thereof would result in the violation of any
law, decree or regulation of governmental authority having appropriate
jurisdiction, and no preliminary or permanent injunction or other order, decree
or ruling issued by a court of competent jurisdiction or by a government,
regulatory or administrative agency or commission nor any statute, rule,
regulation or executive order promulgated or enacted by any governmental
authority shall be in effect which would (i) make the acquisition or holding by
DURA of the Albuterol Program Assets, or the Spiros Product Program Assets, as
the case may be, illegal or impose material limitations on its ability to
exercise full rights of ownership with respect to such Albuterol Program Assets
or Spiros Product Program Assets, as the case may be, or (ii) otherwise prevent
the consummation of the transactions contemplated hereby.

     5.2  CONDITIONS TO OBLIGATIONS OF SPIROS CORP. II.  The obligations of
Spiros Corp. II to consummate the transactions contemplated by this Agreement
following exercise of the Albuterol Option or Product Option, shall be subject,
at Spiros Corp. II's option, to the


                                       -5-

<PAGE>

fulfillment at or prior to the Albuterol Option Closing Date or Product Option
Closing Date, as the case may be, of each of the following conditions:

          (a)    DURA shall have delivered to Spiros Corp. II the Albuterol
Option Exercise Price or the Product Option Exercise Price, as the case may be.

          (b)    Each of the representations and warranties made by DURA in
Section 3.1 of the Technology Agreement shall be true and correct in all
material respects on and as of the Albuterol Option Closing Date or the Product
Option Closing Date, as the case may be, with the same effect as though such
representations and warranties had been made or given on and as of such date,
and DURA shall have performed and complied in all material respects with all of
DURA's obligations under this Agreement which are to be performed or complied
with on or prior to the Albuterol Option Closing Date or the Product Option
Closing Date, as the case may be.

          (c)   No action, suit or other proceeding before a court, tribunal or
other governmental agency or body shall have been instituted or threatened to
restrain or prohibit the consummation of the transactions contemplated by this
Agreement, or seeking to obtain substantial damages in respect thereof, or
involving a claim that consummation thereof would result in the violation of any
law, decree or regulation of governmental authority having appropriate
jurisdiction, and no preliminary or permanent injunction or other order, decree
or ruling issued by a court of competent jurisdiction or by a government,
regulatory or administrative agency or commission nor any statute, rule,
regulation or executive order promulgated or enacted by any governmental
authority shall be in effect which would (i) make the transfer by Spiros Corp.
II of the Albuterol Program Assets or the Spiros Product Program Assets, as the
case may be, pursuant to this Agreement illegal or (ii) otherwise prevent the
consummation of the transactions contemplated hereby.

6.   DISCLAIMER OF WARRANTY.  SPIROS CORP. II DISCLAIMS ALL WARRANTIES, WHETHER
EXPRESS OR IMPLIED, (a) THAT THE ALBUTEROL PROGRAM ASSETS OR THE SPIROS PRODUCT
PROGRAM ASSETS, OR ANY USE THEREOF, WILL BE FREE FROM CLAIMS OF PATENT
INFRINGEMENT, INTERFERENCE OR UNLAWFUL USE OF PROPRIETARY INFORMATION OF ANY
THIRD PARTY AND (b) OF THE ACCURACY, RELIABILITY, TECHNICAL OR COMMERCIAL VALUE,
COMPREHENSIVENESS OR MERCHANTABILITY OF THE ALBUTEROL PROGRAM ASSETS OR THE
SPIROS PRODUCT PROGRAM ASSETS OR THEIR SUITABILITY OR FITNESS FOR ANY PURPOSE
WHATSOEVER, INCLUDING, WITHOUT LIMITATION, THE DESIGN, DEVELOPMENT, MANUFACTURE,
USE OR SALE OF PRODUCTS. EXCEPT AS EXPRESSLY SET FORTH HEREIN, THERE ARE NO
OTHER WARRANTIES OF WHATEVER NATURE, EXPRESS OR IMPLIED, INCLUDING, WITHOUT
LIMITATION, ANY WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE.


                                       -6-

<PAGE>

7.   ADDITIONAL AGREEMENTS.  Following the receipt of the Albuterol Option
Exercise Notice and until the Albuterol Option Closing Date and following the
receipt of the Product Option Exercise Notice and until the Product Option
Closing Date, the following shall apply:

     (a)   DURA and Spiros Corp. II will take all reasonable actions necessary
to comply promptly with all legal requirements which may be imposed on them with
respect to the consummation of the transactions contemplated by this Agreement.
DURA and Spiros Corp. II will take all reasonable actions necessary to obtain
(and will cooperate with the other party in obtaining) any consent, approval,
order or authorization of, or any registration, declaration or filing with, any
governmental entity, domestic or foreign, or other person, required to be
obtained or made by such party in connection with the taking of any action
contemplated by this Agreement.

     (b)    Spiros Corp. II shall each use its best efforts to ensure a quick
and effective transfer to DURA of the Albuterol Program Assets or the Spiros
Product Program Assets, as the case may be.

     (c)    Spiros Corp. II will use its best efforts to preserve the business
organization of Spiros Corp. II intact and, with respect to the Albuterol
Program Assets or the Spiros Product Program Assets, as the case may be, carry
on its business diligently and in substantially the same manner as it did prior
to such exercise and will take such action as may be necessary to maintain,
preserve, renew and keep in force and effect the existence, rights and
franchises of Spiros Corp. II, and Spiros Corp. II shall not, with respect
thereto, make or institute any change in its methods of sale, management,
accounting or operation.

     (d)   Spiros Corp. II shall ensure that, with respect to all Albuterol
Program Assets or all Spiros Product Program Assets, as the case may be, no
contract or commitment will be entered into, and no purchase or sale of assets
(tangible or intangible) will be made, by or on behalf of Spiros Corp. II,
except contracts, commitments, purchases or sales which are in the ordinary
course of business and consistent with past practice and are not material to
Spiros Corp. II (individually or in the aggregate).

8.   TERM; SURVIVAL.

     8.1  TERM.  This Agreement shall continue in full force and effect until
the earliest of (a) the termination of the Technology Agreement, the Development
Agreement or the Manufacturing and Marketing Agreement by Spiros Corp. II as a
result of a breach of such agreement by DURA, (b) at such time as both the
Albuterol Option and Product Option have terminated as to DURA, whether by
exercise or otherwise, or (c) at such time as the Purchase Option terminates,
whether by exercise or otherwise, at which time this Agreement shall terminate.

     8.2  SURVIVAL.  If this Agreement is terminated hereunder, Section 3 shall
survive any such termination.



                                       -7-

<PAGE>

9.   MISCELLANEOUS.

     9.1  NO IMPLIED WAIVERS; RIGHTS CUMULATIVE.  No failure on the part of DURA
or Spiros Corp. II to exercise and no delay in exercising any right, power,
remedy or privilege under this Agreement or provided by statute or at law or in
equity or otherwise, including, without limitation, the right or power to
terminate this Agreement, shall impair, prejudice or constitute a waiver of any
such right, power, remedy or privilege or be construed as a waiver of any breach
of this Agreement or as an acquiescence therein, nor shall any single or partial
exercise of any such right, power, remedy or privilege preclude any other or
further exercise thereof or the exercise of any other right, power, remedy or
privilege.

     9.2  FORCE MAJEURE.  DURA and Spiros Corp. II shall each be excused for any
failure or delay in performing any of their respective obligations under this
Agreement, if such failure or delay is caused by Force Majeure.

     9.3  RELATIONSHIP OF THE PARTIES.  Nothing contained in this Agreement is
intended or is to be construed to constitute DURA and Spiros Corp. II as
partners or joint venturers or one party as an employee of any other party.
Except as expressly provided herein, no party hereto shall have any express or
implied right or authority to assume or create any obligations on behalf of or
in the name of any other party or to bind any other party to any contract,
agreement or undertaking with any third party.

     9.4  NOTICES.  All notices, requests and other communications to DURA or
Spiros Corp. II hereunder shall be in writing (including telecopy or similar
electronic transmissions), shall refer specifically to this Agreement and shall
be personally delivered or sent by telecopy or other electronic facsimile
transmission or by registered mail or certified mail, return receipt requested,
postage prepaid, in each case to the respective address specified below (or to
such address as may be specified in writing to the other party hereto):

          If to DURA, addressed to:

          Dura Pharmaceuticals, Inc.
          7475 Lusk Boulevard
          San Diego, CA  92121
          Attention: President
            with a copy to the attention
            of General Counsel

          If to Spiros Corp. II, addressed to:

          Spiros Development Corporation II, Inc.
          c/o Dura Pharmaceuticals, Inc.
          7475 Lusk Boulevard
          San Diego, CA 92121
          Attention:  President


                                       -8-

<PAGE>

Any notice or communication given in conformity with this Section 9.4 shall be
deemed to be effective when received by the addressee, if delivered by hand,
telecopy or electronic transmission, and three (3) days after mailing, if
mailed.

     9.5  FURTHER ASSURANCES.  Each of DURA and Spiros Corp. II hereby agrees to
duly execute and deliver, or cause to be duly executed and delivered, such
further instruments and do and cause to be done such further acts and things,
including, without limitation, the filing of such additional assignments,
agreements, documents and instruments, that may be necessary or as the other
party hereto may at any time and from time to time reasonably request in
connection with this Agreement or to carry out more effectively the provisions
and purposes of, or to better assure and confirm unto such other party its
rights and remedies under, this Agreement.  Each party shall provide each other
party with copies of any notices sent hereunder with copies sent at the same
time as the original notice.

     9.6  SUCCESSORS AND ASSIGNS.  The terms and provisions of this Agreement
shall inure to the benefit of, and be binding upon, DURA, Spiros Corp. II, and
their respective successors and assigns; PROVIDED, HOWEVER, that DURA and Spiros
Corp. II may not assign or otherwise transfer any of their respective rights and
interests, nor delegate any of their respective obligations, hereunder,
including, without limitation, pursuant to a merger or consolidation, without
the prior written consent of the other party hereto; PROVIDED FURTHER, HOWEVER,
that DURA may fully assign its rights and interests, and delegate its
obligations, hereunder, effective upon written notice thereof (a) to an
Affiliate if such Affiliate assumes all of the obligations of DURA hereunder and
this Agreement remains binding upon DURA; or (b) to any Person that acquires all
or substantially all of the assets of DURA, or which is the surviving Person in
a merger or consolidation with DURA.  Any attempt to assign or delegate any
portion of this Agreement in violation of this Section 9.6 shall be null and
void.  Subject to the foregoing any reference to DURA or Spiros Corp. II
hereunder shall be deemed to include the successors thereto and assigns thereof.

     9.7  AMENDMENTS.  No amendment, modification, waiver, termination or
discharge of any provision of this Agreement, nor consent by DURA or Spiros
Corp. II to any departure therefrom, shall in any event be effective unless the
same shall be in writing specifically identifying this Agreement and the
provision intended to be amended, modified, waived, terminated or discharged and
signed by DURA and Spiros Corp. II, and each amendment, modification, waiver,
termination or discharge shall be effective only in the specific instance and
for the specific purpose for which given.  No provision of this Agreement shall
be varied, contradicted or explained by any other agreement, course of dealing
or performance or any other matter not set forth in an agreement in writing and
signed by DURA and Spiros Corp. II.

     9.8  GOVERNING LAW.  This Agreement shall be governed by and construed in
accordance with the laws of the State of California, as applied to contracts
made and performed entirely within the State of California.  Except as otherwise
provided herein, any claim or controversy arising out of or related to this
contract or any breach hereof shall be submitted to a court of competent
jurisdiction in the State of California, and the parties hereby consent to the
jurisdiction and venue of such court.


                                       -9-

<PAGE>

     9.9  SEVERABILITY. If any provision hereof should be held invalid, illegal
or unenforceable in any respect in any jurisdiction, then, to the fullest extent
permitted by law, (a) all other provisions hereof shall remain in full force and
effect in such jurisdiction and shall be liberally construed in order to carry
out the intentions of the parties hereto as nearly as may be possible and (b)
such invalidity, illegality or unenforceability shall not affect the validity,
legality or enforceability of such provision in any other jurisdiction.  To the
extent permitted by applicable law, DURA and Spiros Corp. II hereby waive any
provision of law that would render any provision hereof prohibited or
unenforceable in any respect.

     9.10 HEADINGS. Headings used herein are for convenience only and shall not
in any way affect the construction of, or be taken into consideration in
interpreting, this Agreement.

     9.11 COUNTERPARTS.  This Agreement may be executed in any number of
counterparts, each of which counterparts, when so executed and delivered, shall
be deemed to be an original, and all of which counterparts, taken together,
shall constitute one and the same instrument.

     9.12 ENTIRE AGREEMENT. This Agreement, together with any agreements
referenced herein and the Prior Agreements, constitutes, on and as of the date
hereof, the entire agreement of DURA and Spiros Corp. II with respect to the
subject matter hereof, and all prior or contemporaneous understandings or
agreements, whether written or oral, between DURA and Spiros Corp. II with
respect to such subject matter are hereby superseded in their entirety.


                [REMAINDER OF THIS PAGE INTENTIONALLY LEFT BLANK]


                                      -10-

<PAGE>

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


                                   SPIROS DEVELOPMENT CORPORATION II, INC.


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



                                   DURA PHARMACEUTICALS, INC.


                                   By: /s/ Cam L. Garner
                                       -----------------------------------------
                                         Cam L. Garner
                                         President and Chief Executive Officer












                    [SIGNATURE PAGE TO ALBUTEROL AND PRODUCT
                           PURCHASE OPTION AGREEMENT]


<PAGE>

                                  SCHEDULE 1.1

                                    GLOSSARY








                                  SCHEDULE 1.1

<PAGE>

                                  SCHEDULE 1.1

                                    GLOSSARY

     "AFFILIATE" of a person shall mean a Person that directly, or indirectly
through one or more intermediaries, controls, is controlled by or is under
common control with such Person.  "Control" (and, with correlative meanings, the
terms "controlled by" and "under common control with") shall mean the possession
of the power to direct or cause the direction of the management and policies of
such Person, whether through the ownership of voting stock, by contract or
otherwise.  In the case of a corporations, "control" shall mean, among other
things, the direct or indirect ownership of more than fifty percent (50%) of its
outstanding voting stock.

     "AGREEMENTS" shall mean the Manufacturing and Marketing Agreement, the
Technology Agreement and the Development Agreement.  

     "ALBUTEROL OPTION" shall have the meaning assigned to it in Section 1.1 of
the Albuterol and Product Option Agreement.

     "ALBUTEROL AND PRODUCT OPTION AGREEMENT" shall mean the Albuterol and
Product Option Agreement dated as of December 22, 1997, between DURA and Spiros
Corp. II, as amended, modified or supplemented from time to time.

     "ALBUTEROL OPTION CLOSING DATE" shall have the meaning assigned to it in
Section 1.5 of the Albuterol and Product Option Agreement.

     "ALBUTEROL PROGRAM ASSETS" shall have the meaning assigned to it in Section
1.1 of the Albuterol and Product Option Agreement.

     "ALBUTEROL PRODUCT" shall have the meaning assigned to it in Section 1.1 of
the Albuterol and Product Option Agreement.

     "AVAILABLE FUNDS" shall mean the sum of (a) the net proceeds to Spiros
Corp. II from the sale of the Units in the Offering and the Contribution, (b)
all royalties remitted to Spiros Corp. II by DURA (or its Affiliates) from the
Sale of Spiros Products pursuant to the Agreements, (c) the Option Proceeds, if
any, (d) any other amounts provided by DURA to Spiros Corp. II, if any and (e)
interest or other income earned through temporary investment of the amounts
described in clauses (a), (b), (c) or (d).

     "BANKRUPTCY CODE" shall mean the United States Bankruptcy Code, as amended
from time to time.

     "CLAIM" shall mean any and all liabilities, damages, losses, settlements,
claims, actions, suits, penalties, fines, costs or expenses (including, without
limitation, reasonable attorneys' fees).

                                  SCHEDULE 1.1
<PAGE>

     "CONFIDENTIAL INFORMATION" shall mean all Program Technology disclosed by
DURA (and its Affiliates) to Spiros Corp. II or by Spiros Corp. II to DURA
pursuant to the Agreements or the Services Agreement.

     "CONTRIBUTION" shall have the meaning assigned in Section 5.2 of the
Development Agreement.

     "CORE TECHNOLOGY" shall mean the DURA Core Technology, the DDSI Core
Technology and the Spiros Core Technology.

     "DDSI CORE TECHNOLOGY" shall mean (a) Technology owned or controlled by
DDSI as of the date of the closing of the Offering necessary or useful to the
development of the Spiros Products, and (b) the DDSI Patent Rights; PROVIDED,
HOWEVER, that DDSI Core Technology shall also include Technology acquired by
DDSI from a third party after the date of the closing of the Offering necessary
or useful to the development of the Spiros Products, except to the extent that
there are any limitations or restrictions on DDSI's ability to license or
sublicense such Technology.  "Owned or controlled" shall include Technology that
DDSI owns, or under which DDSI is licensed and has the right to grant
sublicenses and/or grant immunity from suit.

     "DDSI INDEMNITEE" shall mean DDSI, its successors and assigns, and the
directors, officers, employees, agents and counsel thereof.

     "DDSI PATENT RIGHTS" shall mean those certain inventions described in
claims of (a) the patent applications pending, filed by DDSI (or the rights to
which have been assigned to DDSI) as of the date of the Technology Agreement
relating to dry powder inhalers, powder storage systems and/or formulation
methods for dry powder inhalation, (b) any patent application constituting an
equivalent, counterpart, reissue, extension or continuation (including, without
limitation, a continuation in part or a subdivision) of any of the foregoing
patent applications and (c) any patent issued or issuing upon any of the
foregoing.

     "DESIGNATED COMPOUND(S)" shall mean any compounds for delivery using the
System selected by Spiros Corp. II, and agreed to be developed by DURA.

     "DEVELOPED TECHNOLOGY" shall mean any Technology including, without
limitation, any enhancements, substitutions or improvements to the Core
Technology that is (a) discovered, developed or otherwise acquired by DURA
pursuant to the terms of the Development Agreement or (b) otherwise acquired by
or on behalf of Spiros Corp. II during the term of the Development Agreement.

     "DEVELOPMENT" shall mean the further development of the Program Technology
for the purpose of identifying, developing, manufacturing, marketing and
commercializing Spiros Products and 

                                  SCHEDULE 1.1
<PAGE>

the making of the Other Expenditures.

     "DEVELOPMENT AGREEMENT" shall mean the Development Agreement dated as of 
December 22, 1997, between DURA and Spiros Corp., as amended, modified or 
supplemented from time to time.

     "DEVELOPMENT COSTS" shall mean the Direct Development Costs, the Indirect
Development Costs and the Other Expenditures.

     "DEVELOPMENT TERM" shall mean the period commencing on the Closing Date and
ending on the earlier of (a) the Option Closing Date or (b) the date the Option
terminates or expires other than by exercise.

     "DIRECT DEVELOPMENT COSTS" shall mean all costs incurred by DURA or its 
Affiliates in respect of the Development, other than Indirect Development 
Costs, determined in accordance with generally accepted accounting principles 
consistent with DURA's internal accounting system, allocated on a reasonable 
and consistent basis.  Direct Development Costs shall consist primarily of 
fully-burdened payroll costs (burdened to include benefits, payroll taxes and 
an allocation of facilities and overhead costs) and any other such costs 
generated internally by DURA in respect of the Development.

     "DPI" shall mean the motor-driven dry powder inhaler (other than an inahler
designed to deliver a single dose of a drug) developed by DURA, DDSI and/or
Spiros Corp. and to be developed by DURA and/or Spiros Corp. II.

     "DURA COMMON STOCK" shall mean the Common Stock of DURA, par value $.001
per share.  

     "DURA CORE TECHNOLOGY" shall mean (a) Technology owned or controlled by
DURA as of the date of the closing of the Offering necessary or useful to the
development of the Spiros Products, and (b) the DURA Patent Rights and DURA
Trademarks; PROVIDED, HOWEVER, that DURA Core Technology shall also include
Technology acquired by DURA from a third party after the date of the closing of
the Offering necessary or useful to the development of the Spiros Products,
except to the extent that there are any limitations or restrictions on DURA's
ability to license or sublicense such Technology.  "Owned or controlled" shall
include Technology that DURA owns, or under which DURA is licensed and has the
right to grant sublicenses and/or grant immunity from suit.

     "DURA INDEMNITEE" shall mean DURA, its successors and assigns, and the
directors, officers, employees, agents and counsel thereof.

     "DURA PATENT RIGHTS" shall mean those certain inventions described in
claims of (a) the patent applications pending, filed by DURA (or the rights to
which have been assigned to DURA) as of the date of the Technology Agreement
relating to DPIs, PSSs and/or formulation methods for dry powder inhalation, (b)
any 

                                  SCHEDULE 1.1
<PAGE>

patent application constituting an equivalent, counterpart, reissue,
extension or continuation (including, without limitation, a continuation in part
or a subdivision) of any of the foregoing patent applications and (c) any patent
issued or issuing upon any of the foregoing.

     "DURA TRADEMARKS" shall mean Spiros-TM-.

     "EVENT OF DEFAULT" shall mean any of the following events:  (a) at any
time, if DURA or Spiros Corp. II fails to perform or observe or otherwise
breaches any of its Material Obligations, and such failure or breach continues
unremedied for a period of sixty (60) days after receipt by of written notice
thereof from the other party; (b) at any time, effective as set forth in a
written notice from the other party if DURA or Spiros Corp. II shall (i) seek
the liquidation, reorganization, dissolution or winding-up of itself or the
composition or readjustment of its debts (other than pursuant to a merger with
an Affiliate), (ii) apply for or consent to the appointment of, or the taking
possession by, a receiver, custodian, trustee or liquidator for itself or of all
or a substantial part of its assets, (iii) make a general assignment for the
benefit of its creditors, (iv) commence a voluntary case under the Bankruptcy
Code, (v) file a petition seeking to take advantage of any other law relating to
bankruptcy, insolvency, reorganization, winding-up or composition or
readjustment of debts (other than pursuant to a merger with an Affiliate) or
(vi) adopt any resolution of its Board of Directors or shareholders for the
purpose of effecting any of the foregoing (other than pursuant to a merger with
an Affiliate); or (c) at any time, effective as set forth in a written notice
from the other party, if a proceeding or case shall be commenced without the
application or consent of DURA or Spiros Corp. II as applicable, and such
proceeding or case shall continue undismissed, or an order, judgment or decrees
approving or ordering any of the following shall be entered and continued
unstayed and in effect, for a period of sixty (60) days from and after the date
service of process is effected, seeking (i) DURA's or Spiros Corp. II's, as
applicable, liquidation, reorganization, dissolution or winding-up, or the
composition or readjustment of its debts, (ii) the appointment of a trustee,
receiver, custodian, liquidator or the like of DURA or Spiros Corp. II or for
all or any substantial part of its assets or (iii) similar relief in respect of
DURA or Spiros Corp. II under any law relating to bankruptcy, insolvency,
reorganization, winding-up or the composition or readjustment of debts.

     "FDA" shall mean the United States Food and Drug Administration or any
successor agency or authority, the approval of which is required to market
health care products in the United States.

     "FDA APPROVAL" shall mean the final regulatory approval of the FDA required
to commence commercial marketing of a health product.

                                  SCHEDULE 1.1
<PAGE>

     "FORCE MAJEURE" shall mean any act of God, any accident explosion, fire,
storm, earthquake, flood, drought, peril of the sea, riot, embargo, war or
foreign, federal, state or municipal order of general application, seizure,
requisition or allocation, any failure or delay of transportation, shortage of
or inability to obtain supplies, equipment, fuel or labor or any other
circumstance or event beyond the reasonable control of the party relying upon
such circumstance or event.

     "INDIRECT DEVELOPMENT COSTS" shall mean all costs, fees and out-of-pocket
or other expenses, including the purchase of any capital equipment related to
the Development, incurred or paid by DURA to a third party, other than an
Affiliate of DURA, in respect of the Development, determined in accordance with
generally accepted accounting principles consistent with DURA's internal
accounting system, allocated on a reasonable and consistent basis.

     "MANUFACTURING AND MARKETING AGREEMENT" shall mean the Manufacturing and 
Marketing Agreement dated as of December 22, 1997 between DURA and Spiros 
Corp. II, as amended, modified or supplemented from time to time.

     "MANUFACTURE" shall mean the manufacture and assembly of the Spiros
Products.

     "MATERIAL OBLIGATION" shall mean the material obligations of a party under
the Technology Agreement, the Development Agreement or the Manufacturing and
Marketing Agreement.

     "NET SALES" shall mean the gross amount invoiced for sales of Spiros
Products by DURA or its sublicensees, if any, to third parties less (i)
discounts actually allowed, (ii) credits for claims, allowances, retroactive
price reductions or returned Spiros Products, (iii) prepaid freight charges
incurred in transporting Spiros Products to customers, (iv) sales taxes and
other governmental charges actually paid in connection with the sales (but
excluding what is commonly known as income taxes) and (v) any royalty
obligations under the 1993 Royalty Agreement.  Net Sales shall not include sales
between or among DURA, its Affiliates and its sublicensees unless such sales are
for end use rather than for purposes of resale.

     "OFFERING" shall mean the underwritten public offering of the Units
pursuant to the Registration Statement.

     "OPTION PROCEEDS" shall have the meaning assigned to it in Section 3 of the
Albuterol and Product Option Agreement. 

     "OPTION PRODUCT" shall have the meaning assigned to it in Section 2.1 of
the Albuterol and Product Option Agreement.

     "OTHER EXPENDITURES" shall mean funds spent by Spiros Corp. II to acquire
capital equipment, develop a next generation inhaler system or to enhance the
System.

                                  SCHEDULE 1.1
<PAGE>

     "PATENT RIGHTS" shall mean any patents or patent applications within the
Spiros Corp. II Patent Rights, the DURA Patent Rights, the DDSI Patent Rights
and the Spiros Corp. Patent Rights.

     "PERSON" shall mean any individual, partnership, corporation, firm,
association, unincorporated organization, joint venture, trust or other entity.

     "PRODUCT OPTION" shall have the meaning assigned to it in Section 2.1 of
the Albuterol and Product Option Agreement. 

     "PRODUCT OPTION CLOSING DATE" shall have the meaning assigned to it in
Section 2.5 of the Albuterol and Product Option Agreement.

     "PROGRAM TECHNOLOGY" shall mean the Core Technology and the Developed
Technology.

     "PSS" shall mean the powder storage system developed and to be developed by
DURA for use with the DPI.

     "PURCHASE AGREEMENT" shall mean the Purchase Agreement dated as of
December 16, 1997, among DURA, Spiros Corp. II, Merrill Lynch & Co., and
Donaldson, Lufkin & Jenrette.  

     "PURCHASE OPTION" shall mean the option granted to the holder of Spiros
Corp. II's Special Common Stock to purchase all of the Spiros Corp. II Common
Stock as set forth in Article V of the Spiros Corp. II Charter.

     "PURCHASE OPTION CLOSING DATE" shall have the meaning assigned to it in
Article V of the Spiros Corp. II Charter.

     "PURCHASE OPTION EXERCISE PRICE" shall have the meaning assigned to it in
Article V of the Spiros Corp. II Charter 

     "REGISTRATION STATEMENT" shall mean the Registration Statement on Form 
S-1/S-3 filed by Spiros Corp. II and DURA dated October 10, 1997 (No. 
333-37673/333-37673-01), including all exhibits and any amendments thereof 
and supplements thereto.

     "RESEARCH FUNDS" shall mean the Available Funds, less (i) all general and
administrative expenses including, without limitation, those paid or payable
pursuant to the Development Agreement or the Services Agreement, and the
reasonable out-of-pocket expenses of Spiros Corp. II directors and reasonable
compensation for Spiros Corp. II's independent directors, less (ii) any amounts
paid to DURA under the Development Agreement or the Services Agreement, less
(iii) any costs and expenses incurred in the defense or settlement of any action
or claim or in respect of a judgment thereon, and less (iv) One Million Dollars
($1,000,000) to be retained by Spiros Corp. II as working capital in the event
DURA does not exercise the Purchase Option.

                                  SCHEDULE 1.1
<PAGE>

     "SALE(S)" or "SELL" shall mean the activity undertaken by a sales
representative during a sales call on physicians, physician assistants, nurses,
hospitals, clinics, health maintenance organizations, preferred provider
organizations and managed care companies (including all forms of communication
not involving face to face contact by such sales representatives), describing
the FDA-approved indicated uses, safety, effectiveness, contraindications, side
effects, warnings and other relevant characteristics of the Spiros Product, in a
fair and balanced manner consistent with the requirements of the Federal Food,
Drug, and Cosmetic Act, as amended (and the regulations thereunder).  

     "SPIROS CASSETTE SYSTEM" shall mean a DPI in which the PSS is in the form
of a cassette.

     "SPIROS CORE TECHNOLOGY" shall mean (a) Technology owned or controlled by
Spiros Corp. as of the date of the closing of the Offering necessary or useful
to the development of the Spiros Products, and (b) the Spiros Corp. Patent
Rights; PROVIDED, HOWEVER, that Spiros Core Technology shall also include
Technology acquired by Spiros Corp. from a third party after the date of the
closing of the Offering necessary or useful to the development of the Spiros
Products, except to the extent that there are any limitations or restrictions on
Spiros Corp.'s ability to license or sublicense such Technology.  "Owned or
controlled" shall include Technology that Spiros Corp. owns, or under which
Spiros Corp. is licensed and has the right to grant sublicenses and/or grant
immunity from suit.

     "SPIROS CORP. INDEMNITEE" shall mean Spiros Corp., its successors and
assigns, and the directors, officers, employees, agents and counsel thereof.  

     "SPIROS CORP. PATENT RIGHTS" shall mean those certain inventions described
in claims of (a) the patent applications pending, filed by Spiros Corp. (or the
rights to which have been assigned to Spiros Corp.) as of the date of the
Technology Agreement relating to dry powder inhalers, powder storage systems
and/or formulation methods for dry powder inhalation, (b) any patent application
constituting an equivalent, counterpart, reissue, extension or continuation
(including, without limitation, a continuation in part or a subdivision) of any
of the foregoing patent applications and (c) any patent issued or issuing upon
any of the foregoing.

     "SPIROS CORP. II CHARTER" shall mean Amended and Restated Certificate of
Spiros Development Corporation II, Inc. in effect as of the closing of the
Offering, as amended from time to time.

     "SPIROS CORP. II COMMON STOCK" shall mean the Callable Common Stock of
Spiros Corp. II, $.001 par value.

     "SPIROS CORP. II INDEMNITEE" shall mean Spiros Corp. II, its 

                                  SCHEDULE 1.1
<PAGE>

successors and assigns, and the directors, officers, employees, agents and 
counsel thereof.

     "SPIROS CORP. II PATENT RIGHTS" shall mean those certain inventions
described in claims of (a) any patent application having one or more claims
covering Developed Technology, (b) any patent application constituting an
equivalent, counterpart, reissue, extension or continuation (including, without
limitation, a continuation in part or a subdivision) of any of the foregoing
applications or (c) any patent issued or issuing upon any of the foregoing
applications.

     "SPIROS PRODUCT(S)" shall mean (a) any System used with a formulation of
albuterol, beclomethasone, ipratropium, an albuterol-ipratropium combination,
budesonide or a Designated Compound developed, produced, manufactured or
marketed by DURA on behalf of Spiros Corp. II using the Program Technology.

     "SPIROS PRODUCT PROGRAM ASSETS" shall have the meaning assigned to it in
Section 2.1 of the Albuterol and Product Option Agreement.

     "SYSTEM" shall mean the DPI and the PSS when used together.

     "TECHNOLOGY" shall mean, solely with respect to motor-driven dry powder
inhalers and powder storage systems for drugs for delivery through such
inhalers, the manufacture thereof, and formulations of drugs to be delivered
through such inhalers, public and nonpublic technical or other information,
trade secrets, know-how, processes, formulations, concepts, ideas, preclinical,
clinical, pharmacological or other data and testing results, experimental
methods, or results, assays, descriptions, business or scientific plans,
depictions, customer lists and any other written, printed or electronically
stored materials, pharmaceutical compounds or any other natural or man-made
pharmaceutical materials and any and all other intellectual  property, including
patents and patent applications, of any nature whatsoever.  The term
"Technology" shall include, without limitation, any of the foregoing as it
relates to enhancements of, substitutions for or improvements to the Core
Technology.

     "TECHNOLOGY AGREEMENT" shall mean the Technology License Agreement dated 
as of December 22, 1997, among DURA, DDSI, Spiros Corp. and Spiros Corp. II, 
as amended, modified or supplemented from time to time.

     "TERRITORY" shall mean the entire world.
     
     "UNDERWRITERS" shall have the meaning assigned to it in the Registration
Statement.

     "UNITS" shall mean units, each consisting of one share of Spiros Corp. II
Common Stock and one warrant to purchase one-fourth of one share of DURA Common
Stock, all as described in the Registration Statement.

                                  SCHEDULE 1.1
<PAGE>

     "1993 ROYALTY AGREEMENT" shall have the meaning assigned to it in the
Registration Statement.







                                  SCHEDULE 1.1


<PAGE>



                      MANUFACTURING AND MARKETING AGREEMENT


     This MANUFACTURING AND MARKETING AGREEMENT (the "Agreement") is made as 
of December 22, 1997 by and between DURA PHARMACEUTICALS, INC., a Delaware 
corporation ("DURA"), and SPIROS DEVELOPMENT CORPORATION II, INC., a Delaware 
corporation ("Spiros Corp. II").

                                    RECITALS

     WHEREAS, DURA and Spiros Corp. II are parties to the Development 
Agreement, the Technology Agreement and the Albuterol and Product Option 
Agreement (all capitalized terms shall have the respective meaning set forth 
in Section 1 hereof).

     WHEREAS, DURA has the Purchase Option to acquire all of the Spiros Corp. 
II Common Stock. 

     WHEREAS, DURA has the expertise necessary to manufacture, itself or 
through subcontractors, the Spiros Products.

     WHEREAS, DURA has marketing and sales personnel currently performing 
marketing for respiratory pharmaceutical products.

     WHEREAS, Spiros Corp. II desires to license DURA to manufacture, promote 
and sell the Spiros Products, and DURA is willing to accept such engagement.

     NOW, THEREFORE, in consideration of the mutual covenants set forth 
herein and for other good and valuable consideration, the receipt and 
sufficiency of which are hereby acknowledged, and in order to induce DURA to 
enter into the Agreements, DURA and Spiros Corp. II hereby agree as follows:

1.   DEFINITIONS.

     1.1  DEFINITIONS.  All capitalized terms used herein and not otherwise 
defined shall have the respective meanings, to the extent such terms are used 
herein, set forth in SCHEDULE 1.1 attached hereto, which is incorporated by 
this reference as though fully set forth herein.

     1.2  SINGULAR AND PLURAL.  Singular and plural forms, as the case may 
be, of terms defined herein shall have correlative meanings.

2.   DURA'S RESPONSIBILITIES.

     2.1  DURA'S GENERAL RESPONSIBILITIES.  During the term of this 
Agreement, DURA shall, at its sole expense (except as otherwise expressly 
provided herein), in addition to its other obligations hereunder, have 
responsibility for performing the activities set forth below:

                                     

<PAGE>

          (a)  supervise, train and maintain such competent and qualified 
sales personnel as may be required to promote the Spiros Products as provided 
herein;

          (b)  use diligent and commercially reasonable efforts to launch, 
market, promote and commence Sales of a Spiros Product promptly upon receipt 
of FDA Approval of such Spiros Product;

          (c)  on or before the thirtieth (30th) day of each calendar quarter 
following receipt of FDA Approval, furnish to Spiros Corp. II a report 
containing DURA's Manufacture and Sales activities during the prior calendar 
quarter;

          (d)  make no statement, representation or warranty, oral or 
written, concerning the Spiros Products inconsistent with or contrary to the 
labeling approved by regulatory authorities in respect of the Spiros Products;

          (e)  promptly submit to Spiros Corp. II all adverse drug experience 
information concerning the Spiros Products; and

          (f)  conform its practices and procedures relating to Spiros 
Product sampling to product sampling practices and procedures DURA follows 
with respect to other similar products, which practices and procedures shall 
be in compliance with applicable rules and regulations.

DURA shall take such other actions as DURA and Spiros Corp. II may jointly 
agree upon and deem necessary, desirable or appropriate to promote and Sell 
the Spiros Products effectively and as contemplated by this Agreement.

     2.2  ADVERTISING AND PROMOTIONAL RESPONSIBILITIES.  From time to time, 
but at least once each year, DURA shall develop and formulate a marketing 
plan setting forth DURA's strategies and plans for pricing, marketing and 
detailing Spiros Products.  Marketing plans shall be prepared in a manner 
appropriate for product launch and consistent with sales and marketing plans 
for similarly placed pharmaceutical products.  The marketing plans shall be 
submitted to the Board of Directors of Spiros Corp. II as part of the annual 
workplan and budget for approval.

     2.3  TERMS OF SALE.  DURA will be responsible for determining all terms 
of sale, including but not limited to, policies concerning pricing, credit 
terms, cash discounts and returns and allowances.

3.   ROYALTIES.

     3.1  ROYALTIES ON SALES OF SPIROS PRODUCTS.  Dura shall receive and 
retain on its own behalf all payments by purchasers 

                                      -2-

<PAGE>


of the Spiros Products Sold by DURA hereunder.  DURA hereby agrees to pay to 
Spiros Corp. II royalties equal to seven percent (7%) of Net Sales of each 
Spiros Products Sold beginning on the date of FDA Approval of such product; 
provided, however, that prior to the expiration of the Albuterol Option no 
royalty payment shall apply with respect to Net Sales of the Albuterol 
Product.

     3.2  ROYALTY PAYMENT.  Royalties due on Net Sales of Spiros Products 
shall be paid quarterly in arrears, on or before the forty-fifth (45th) day 
following the end of each calendar quarter.  Acceptance by Spiros Corp. II of 
any payment remitted hereunder, whether or not the amount shall be in 
dispute, shall not constitute acceptance by Spiros Corp. II of the account or 
schedules on which such payment is based.

     3.3  SINGLE ROYALTY.  All sales of Spiros Products among DURA, its 
Affiliates and any of their sublicensees shall be disregarded for purposes of 
computing royalties under this Section 3, but in such instances royalties 
shall be payable only upon sales to unlicensed third parties unless such 
other sales were for purposes of end use, rather than for resale.  Nothing 
contained herein shall obligate DURA to pay Spiros Corp. II more than one 
royalty on any unit of Spiros Products sold.

     3.4  LATE PAYMENTS.  DURA shall pay interest to Spiros Corp. II on the 
aggregate amount of any amounts payable by DURA that are not paid on or 
before the date such payments are due under this Agreement at a rate per 
annum equal to the lesser of the prime rate of interest as reported by 
Citibank, N.A., New York, from time to time, plus two percent (2%), or the 
highest rate permitted by applicable law, calculated on the number of days 
such payment is delinquent.

4.   ACCOUNTING AND STATEMENTS.

     4.1  ROYALTY STATEMENTS.  DURA shall keep, and cause its Affiliates, if 
any, to keep true and accurate accounts of all royalties payable to Spiros 
Corp. II under the Agreement and DURA shall deliver or cause to be delivered 
to Spiros Corp. II written statements of royalties due on or before the 
forty-fifth (45th) day following the end of each calendar quarter and at the 
same time shall pay Spiros Corp. II the amount of such royalties shown to be 
due pursuant to Section 3.  Such reports shall show in reasonably specific 
detail:  (a) the gross sales of each Spiros Product sold by DURA, its 
Affiliates and sublicensees during the reporting period and the calculation 
of Net Sales from such gross sales; (b) the royalties payable in United 
States dollars, if any, which shall have accrued hereunder based upon Net 
Sales of Spiros Products; (c) the withholding taxes, if any, required by law 
to be deducted in respect of such sales; and (d) the date of the first 
commercial sale of each Spiros Product.

                                     -3-  

<PAGE>

     4.2  RECORDS.  DURA shall keep, and cause its Affiliates and sublicensees,
if any, to keep accurate records in sufficient detail to be able to determine
the amount of royalties payable.  Spiros Corp. II shall have the right at its
own expense to have an independent certified public accounting firm examine the
relevant books and records of account of DURA, any of its Affiliates or
sublicensees during reasonable business hours not more often than once during
each calendar year, to determine whether appropriate accounting and payment of
royalties have been made during the preceding two (2) calendar years.  This
independent certified public accounting firm shall treat as confidential and
shall not disclose to Spiros Corp. II any information other than information
which is needed or proper to support the information required to be given to
Spiros Corp. II pursuant to this Agreement.  If such accounting firm concludes
that additional royalties were owed during such period, DURA shall pay the
additional royalties within thirty (30) days of the date Spiros Corp. II
delivers to DURA such accounting firm's written report so concluding.  The fees
charged by such accounting firm shall be paid by Spiros Corp. II; PROVIDED,
HOWEVER, if the audit discloses that the royalties payable by DURA for the
audited period are more than one hundred five percent (105%) of the royalties
actually paid for such period, then DURA shall pay the reasonable fees and
expenses charged by such accounting firm.

     4.3  SUBLICENSEE RECORDS.  DURA shall include in each permitted sublicense
granted by it pursuant to this Agreement or the License Agreement a provision
requiring the sublicensee to make reports to DURA, to keep and maintain records
of sales made pursuant to such sublicense and to grant access to such records by
Spiros Corp. II's independent accountant to the same extent required of DURA
under this Agreement.

5.   MANUFACTURING AND SALE RECORDS.  DURA shall keep, maintain, update and 
preserve for the benefit of Spiros Corp. II true, accurate and complete 
records of all efforts made by DURA pursuant to this Agreement, including, 
without limitation, records of current and prospective customer contacts, 
status of sales programs, advertising efforts, promotion efforts, market 
feedback, marketing strategy, distribution, business leads and sales leads 
("Records"). Upon written request of Spiros Corp. II or upon the termination 
of this Agreement, copies of the Records shall be sent by DURA to Spiros 
Corp. II within sixty (60) days of such request or termination.

6.   MANUFACTURING PRACTICES.

     6.1  MANUFACTURING SPECIFICATIONS.  The Manufacture of all Spiros 
Products during the term of this Agreement shall be the responsibility of 
DURA.  DURA shall manufacture, or cause its 

                                      -4-

<PAGE>

subcontractor to manufacture, the Spiros Products under this Agreement in 
compliance in all material respects with all requirements of applicable laws 
and regulations and all applicable good manufacturing practices, as 
prescribed from time to time by the FDA and other applicable worldwide 
regulatory authorities, using the specifications, manufacturing methods and 
formulae as agreed upon by DURA and Spiros Corp. II in writing.

     6.2  INSPECTION OF MANUFACTURING FACILITIES.  DURA or its subcontractor 
shall permit Spiros Corp. II and its duly authorized agents, at Spiros Corp. 
II's sole expense, to enter DURA's or its subcontractor's premises, upon 
reasonable notice during normal working hours, for the purpose of inspecting 
the manufacturing processes and components used in the manufacture of the 
Spiros Products and the quality thereof.

7.   CONFIDENTIALITY.  The provisions of Sections 4.3 and 4.4 of the 
Technology Agreement shall apply with equal force and effect to this 
Agreement and are incorporated hereunder. 

8.   REPRESENTATIONS, WARRANTIES AND COVENANTS.  The provisions of Section 3 
of the Technology Agreement with respect to DURA and Spiros Corp. II shall 
apply with equal force and effect to this Agreement and are incorporated 
hereunder. In addition, DURA represents, warrants and covenants to Spiros 
Corp. II as follows:

     8.1  DURA'S EFFORTS.  DURA shall use its commercially reasonable efforts 
to locate and contact specialist respiratory physicians and other physicians, 
hospitals, clinics, health maintenance organizations, preferred provider 
organizations and managed care companies for the purpose of determining 
whether such persons, groups or entities may be interested in buying or 
prescribing the Spiros Products.  DURA hereby agrees that failure to use its 
commercially reasonable efforts as described in this Agreement shall 
constitute a material breach of this Agreement;

     8.2  COMPLIANCE WITH APPLICABLE LAWS.  DURA shall comply (and shall 
require all its sublicensees, agents and representatives to comply) with all 
applicable laws, statutes, regulations and treaties relating to the 
Manufacture and Sale of the Spiros Corp. II's Products and the performance of 
DURA's obligations hereunder.  DURA shall demonstrate, at Spiros Corp. II's 
reasonable request, compliance with all applicable laws, statutes, 
regulations and treaties;

     8.3  USE OF NAMES.  DURA shall use the then-current names used by Spiros 
Corp. II for the Spiros Products (but will not represent or imply that it is 
Spiros Corp. II or an Affiliate of Spiros Corp. II, or a part of or partner 
or joint venturer with Spiros Corp. II);

     8.4  NOTIFICATION OF PROBLEMS WITH SPIROS PRODUCTS.  DURA 

                                      -5-

<PAGE>

shall keep Spiros Corp. II informed as to any problems encountered with the 
Spiros Products and any suggested resolutions for those problems and shall 
communicate promptly to Spiros Corp. II any and all modifications, design 
changes or improvements suggested by any employee or agent; and

     8.5  RECORDS.  DURA shall keep and maintain a file of all persons and 
entities to which Spiros Products have been sold by DURA or its sublicensees, 
including:  name; address; serial number, if any, of the Spiros Products; 
date of delivery; and any applicable contract or purchase order executed by 
such person or entity.  Such file may be inspected by Spiros Corp. II at any 
time and a complete copy of such file shall be delivered to Spiros Corp. II 
upon the termination or earlier expiration of this Agreement pursuant to 
Section 9.

9.   TERM AND TERMINATION.  

     9.1  TERM.  This Agreement shall be effective as of the date hereof and, 
unless terminated earlier as provided in Sections 9.2, 9.3 and 9.4 hereof, 
and shall continue in full force and effect until such time as the Purchase 
Option terminates or expires (other than by exercise), subject to Section 9.6.

     9.2  TERMINATION BY MUTUAL AGREEMENT.  By mutual agreement, the parties 
hereto may at any time terminate this Agreement on mutually acceptable terms.

     9.3  EFFECT OF OPTION EXERCISES.  

          9.3.1     PURCHASE OPTION.  Subject to Section 9.6, in the event 
the Purchase Option is exercised by DURA, this Agreement shall terminate, 
effective upon the Purchase Option Closing Date, without any obligation to 
make payments pursuant to Section 7 of the Technology Agreement.

          9.3.2     PARTIAL TERMINATION UPON EXERCISE OF ALBUTEROL OPTION.  
In the event that the Albuterol Option is exercised, this Agreement shall 
terminate, effective on the Albuterol Option Closing Date, with respect to 
the Albuterol Program Assets and any obligation to make royalty payments with 
respect to the Albuterol Product, but shall otherwise continue in full force 
and effect until terminated pursuant to this Section 9.

          9.3.3     PARTIAL TERMINATION UPON EXERCISE OF PRODUCT OPTION.  In 
the event that the Product Option is exercised, this Agreement shall 
terminate, effective on the Product Option Closing Date, with respect to the 
Option Product and any obligation to make royalty payments with respect to 
the Product Option, but shall otherwise continue in full force and effect 
until terminated pursuant to this Section 9.  

                                      -6-  

<PAGE>

     9.4  TERMINATION BY DURA.  Either DURA or Spiros Corp. II shall have the 
right to terminate this Agreement, effective as set forth in a written notice 
to the other of an Event of Default with respect to such other party.

     9.5  EFFECT OF TERMINATION.  

          9.5.1     RETURN OF SPIROS PRODUCTS.  In the event of the 
termination of DURA's right to continue to Manufacture and Sell one or more 
(other than as a result of the exercise of the Albuterol Option or the 
Product Option) Spiros Products pursuant to Section 9.4 as a result of an 
Event of Default by DURA, DURA shall within thirty (30) days of the effective 
date of such termination, transfer to Spiros Corp. II all Program Technology 
and all other data, records and materials in DURA's possession or control 
which relate to such Spiros Products.  In addition, DURA shall within fifteen 
(15) days of the effective date of the termination notify Spiros Corp. II in 
writing of the quantity of such Spiros Products which it has in inventory, 
and DURA shall thereupon be permitted during the six (6) months following 
such termination to Sell such inventory of Spiros Products; provided that 
Spiros Corp. II shall first have the right to purchase such Spiros Products 
for a transfer price equal to the cost of manufacture of such products 
together with DURA's overhead thereon.  DURA shall also cooperate in the 
transfer of regulatory filings related to such Spiros Products, and take such 
other actions and execute such other instruments, assignments and documents 
as may be necessary to effect the transfer of the Manufacture and Sale rights 
to Spiros Corp. II.

          9.5.2     SURVIVAL.  Sections 1, 2.1(c), (d), (e) and (f), 3 (but 
only to the extent rights to payments have accrued prior to termination), 4, 
5, 7, 8, 9, 10 and 11 of this Agreement, and all obligations to pay any 
amounts due hereunder, shall survive, and shall not be affected by, any 
termination of this Agreement pursuant to this Section 9.

10.  INDEMNIFICATION AND INSURANCE.  

     10.1 INDEMNIFICATION.  The provisions of Sections 6.1 and 6.2 of the 
Technology Agreement shall apply with equal force and effect to this 
Agreement and are incorporated hereunder.  

     10.2 INSURANCE.

          10.2.1    INSURANCE BY SPIROS CORP. II.  To the extent Spiros Corp. 
II develops or uses, or causes the development or use (except by DURA or its 
Affiliates or sublicensees under this Agreement) of, the Spiros Products, 
Spiros Corp. II shall, to the extent available at commercially reasonable 
rates, maintain with insurers or underwriters of good repute such insurance 
relating 

                                      -7-

<PAGE>

to the development, sale and use of the Spiros Products, against such risks, 
pursuant to such terms (including deductible limits or self-insured 
retentions) and for such periods, as is customary for comparable businesses 
undertaking the development, sale and use of products of a similar nature, 
and shall, to the extent reasonably possible and not unreasonably expensive, 
cause DURA and its Affiliates to be named as additional insured parties on 
its insurance policies. To the extent Spiros Corp. II is required to obtain 
insurance under this Section 10.2.1 during the term of this Agreement, Spiros 
Corp. II may use Available Funds to pay the premiums therefore.

          10.2.2    INSURANCE BY DURA.  DURA shall, to the extent available 
at commercially reasonable rates, maintain, with insurers or underwriters of 
good repute such insurance relating to the Development, Manufacture and Sale, 
against such risks and pursuant to such terms (including deductible limits or 
self-insured retentions) as is customary for comparable businesses 
undertaking research, development and commercialization programs of a similar 
nature, and shall, to the extent reasonably possible and not unreasonably 
expensive, cause Spiros Corp. II to be named as an additional insured party 
on its insurance policies.

11.  MISCELLANEOUS.

     11.1 NO IMPLIED WAIVERS; RIGHTS CUMULATIVE.  No failure on the part of 
DURA or Spiros Corp. II to exercise and no delay in exercising any right, 
power, remedy or privilege under this Agreement or provided by statute or at 
law or in equity or otherwise, including, without limitation, the right or 
power to terminate this Agreement, shall impair, prejudice or constitute a 
waiver of any such right, power, remedy or privilege or be construed as a 
waiver of any breach of this Agreement or as an acquiescence therein, nor 
shall any single or partial exercise of any such right, power, remedy or 
privilege preclude any other or further exercise thereof or the exercise of 
any other right, power, remedy or privilege.

     11.2 FORCE MAJEURE.  DURA and Spiros Corp. II shall each be excused for 
any failure or delay in performing any of their respective obligations under 
this Agreement, if such failure or delay is caused by Force Majeure.

     11.3 RELATIONSHIP OF THE PARTIES.  Nothing contained in this Agreement 
is intended or is to be construed to constitute DURA and Spiros Corp. II as 
partners or joint venturers or one party as an employee of any other party. 
Except as expressly provided herein, no party hereto shall have any express 
or implied right or authority to assume or create any obligations on behalf 
of or in the name of any other party or to bind any other party to any 
contract, agreement or undertaking with any third party.
 
                                     -8-

<PAGE>

     11.4 NOTICES.  All notices, requests and other communications to DURA or 
Spiros Corp. II hereunder shall be in writing (including telecopy or similar 
electronic transmissions), shall refer specifically to this Agreement and 
shall be personally delivered or sent by telecopy or other electronic 
facsimile transmission or by registered mail or certified mail, return 
receipt requested, postage prepaid, or reliable overnight courier service, in 
each case to the respective address specified below (or to such address as 
may be specified in writing to the other party hereto):

          If to DURA, addressed to:

          Dura Pharmaceuticals, Inc.
          7475 Lusk Boulevard
          San Diego, CA  92121
          Attention: President
            with a copy to the attention of General Counsel

          If to Spiros Corp. II, addressed to:

          Spiros Development Corporation II, Inc.
          7475 Lusk Boulevard
          San Diego, CA 92121
          Attention:  President

Any notice or communication given in conformity with this Section 11.4 shall 
be deemed to be effective when received by the addressee, if delivered by 
hand, telecopy or electronic transmission, three (3) days after mailing, if 
mailed, and one (1) business day after delivery to a reliable overnight 
courier service.

     11.5 FURTHER ASSURANCES.  Each of DURA and Spiros Corp. II hereby agrees 
to duly execute and deliver, or cause to be duly executed and delivered, such 
further instruments and do and cause to be done such further acts and things, 
including, without limitation, the filing of such additional assignments, 
agreements, documents and instruments, that may be necessary or as the other 
party hereto may at any time and from time to time reasonably request in 
connection with this Agreement or to carry out more effectively the 
provisions and purposes of, or to better assure and confirm unto such other 
party its rights and remedies under, this Agreement.  

     11.6 SUCCESSORS AND ASSIGNS.  The terms and provisions of this Agreement 
shall inure to the benefit of, and be binding upon, DURA, Spiros Corp. II, 
and their respective successors and assigns; PROVIDED, HOWEVER, that DURA and 
Spiros Corp. II may not assign or otherwise transfer any of their respective 
rights and interests, nor delegate any of their respective obligations, 
hereunder, including, without limitation, pursuant to a merger or 

                                      -9-

<PAGE>

consolidation, without the prior written consent of the other party hereto; 
PROVIDED FURTHER, HOWEVER, that DURA may fully assign its rights and 
interests, and delegate its obligations, hereunder, effective upon written 
notice thereof (a) to an Affiliate if such Affiliate assumes all of the 
obligations of DURA hereunder and this Agreement remains binding upon DURA; 
or (b) to any Person that acquires all or substantially all of the assets of 
DURA, or which is the surviving Person in a merger or consolidation with 
DURA, if such Person assumes all the obligations of DURA hereunder. 
Notwithstanding the foregoing, Spiros Corp. II shall have the right to assign 
its rights and delegate its obligations hereunder following expiration or 
termination (other than by exercise) of the Purchase Option.  Any attempt to 
assign or delegate any portion of this Agreement in violation of this Section 
11.6 shall be null and void.  Subject to the foregoing any reference to DURA 
or Spiros Corp. II hereunder shall be deemed to include the successors 
thereto and assigns thereof.

     11.7 AMENDMENTS.  No amendment, modification, waiver, termination or 
discharge of any provision of this Agreement, nor consent by DURA or Spiros 
Corp. II to any departure therefrom, shall in any event be effective unless 
the same shall be in writing specifically identifying this Agreement and the 
provision intended to be amended, modified, waived, terminated or discharged 
and signed by DURA and Spiros Corp. II, and each amendment, modification, 
waiver, termination or discharge shall be effective only in the specific 
instance and for the specific purpose for which given.  No provision of this 
Agreement shall be varied, contradicted or explained by any other agreement, 
course of dealing or performance or any other matter not set forth in an 
agreement in writing and signed by DURA and Spiros Corp. II. 

     11.8 GOVERNING LAW.  This Agreement shall be governed by and construed 
in accordance with the laws of the State of California, as applied to 
contracts made and performed entirely within the State of California.  Except 
as otherwise provided herein, any claim or controversy arising out of or 
related to this contract or any breach hereof shall be submitted to a court 
of competent jurisdiction in the State of California, and the parties hereby 
consent to the jurisdiction and venue of such court.

     11.9 SEVERABILITY. If any provision hereof should be held invalid, 
illegal or unenforceable in any respect in any jurisdiction, then, to the 
fullest extent permitted by law, (a) all other provisions hereof shall remain 
in full force and effect in such jurisdiction and shall be liberally 
construed in order to carry out the intentions of the parties hereto as 
nearly as may be possible and (b) such invalidity, illegality or 
unenforceability shall not affect the validity, legality or enforceability of 
such provision in any other jurisdiction. To the extent permitted by 
applicable law, DURA and Spiros Corp. II 

                                     -10-

<PAGE>


hereby waive any provision of law that would render any provision hereof 
prohibited or unenforceable in any respect.

     11.10  HEADINGS. Headings used herein are for convenience only and shall 
not in any way affect the construction of, or be taken into consideration in 
interpreting, this Agreement.

     11.11  COUNTERPARTS.  This Agreement may be executed in any number of 
counterparts, each of which counterparts, when so executed and delivered, 
shall be deemed to be an original, and all of which counterparts, taken 
together, shall constitute one and the same instrument.

     11.12  ENTIRE AGREEMENT. This Agreement, together with any agreements 
referenced herein, constitute, on and as of the date hereof, the entire 
agreement of DURA and Spiros Corp. II with respect to the subject matter 
hereof, and all prior or contemporaneous understandings or agreements, 
whether written or oral, between DURA and Spiros Corp. II with respect to 
such subject matter are hereby superseded in their entirety.

                [REMAINDER OF THIS PAGE INTENTIONALLY LEFT BLANK]

                                     -11- 

<PAGE>

     IN WITNESS WHEREOF the parties have executed this Agreement as of the date
first above written.

                         DURA PHARMACEUTICALS, INC.



                          By: /s/ Cam L. Garner
                             -------------------------------------------------
                              Cam L. Garner
                              President and Chief Executive Officer


                            SPIROS DEVELOPMENT CORPORATION II, INC.



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














                      [SIGNATURE PAGE TO MANUFACTURING AND
                              MARKETING AGREEMENT]


<PAGE>


                                  SCHEDULE 1.1

                                    GLOSSARY

<PAGE>


                                  SCHEDULE 1.1

                                    GLOSSARY

     "AFFILIATE" of a person shall mean a Person that directly, or indirectly
through one or more intermediaries, controls, is controlled by or is under
common control with such Person.  "Control" (and, with correlative meanings, the
terms "controlled by" and "under common control with") shall mean the possession
of the power to direct or cause the direction of the management and policies of
such Person, whether through the ownership of voting stock, by contract or
otherwise.  In the case of a corporations, "control" shall mean, among other
things, the direct or indirect ownership of more than fifty percent (50%) of its
outstanding voting stock.

     "AGREEMENTS" shall mean the Manufacturing and Marketing Agreement, the
Technology Agreement and the Development Agreement.  

     "ALBUTEROL OPTION" shall have the meaning assigned to it in Section 1.1 of
the Albuterol and Product Option Agreement.

     "ALBUTEROL AND PRODUCT OPTION AGREEMENT" shall mean the Albuterol and
Product Option Agreement dated as of December 22, 1997, between DURA and Spiros
Corp. II, as amended, modified or supplemented from time to time.

     "ALBUTEROL OPTION CLOSING DATE" shall have the meaning assigned to it in
Section 1.5 of the Albuterol and Product Option Agreement.

     "ALBUTEROL PROGRAM ASSETS" shall have the meaning assigned to it in Section
1.1 of the Albuterol and Product Option Agreement.

     "ALBUTEROL PRODUCT" shall have the meaning assigned to it in Section 1.1 of
the Albuterol and Product Option Agreement.

     "AVAILABLE FUNDS" shall mean the sum of (a) the net proceeds to Spiros
Corp. II from the sale of the Units in the Offering and the Contribution, (b)
all royalties remitted to Spiros Corp. II by DURA (or its Affiliates) from the
Sale of Spiros Products pursuant to the Agreements, (c) the Option Proceeds, if
any, (d) any other amounts provided by DURA to Spiros Corp. II, if any and (e)
interest or other income earned through temporary investment of the amounts
described in clauses (a), (b), (c) or (d).

     "BANKRUPTCY CODE" shall mean the United States Bankruptcy Code, as amended
from time to time.

     "CLAIM" shall mean any and all liabilities, damages, losses, settlements,
claims, actions, suits, penalties, fines, costs or expenses (including, without
limitation, reasonable attorneys' fees).

                                     SCHEDULE 1.1

<PAGE>


     "CONFIDENTIAL INFORMATION" shall mean all Program Technology disclosed by
DURA (and its Affiliates) to Spiros Corp. II or by Spiros Corp. II to DURA
pursuant to the Agreements or the Services Agreement.

     "CONTRIBUTION" shall have the meaning assigned in Section 5.2 of the
Development Agreement.

     "CORE TECHNOLOGY" shall mean the DURA Core Technology, the DDSI Core
Technology and the Spiros Core Technology.

     "DDSI CORE TECHNOLOGY" shall mean (a) Technology owned or controlled by
DDSI as of the date of the closing of the Offering necessary or useful to the
development of the Spiros Products, and (b) the DDSI Patent Rights; PROVIDED,
HOWEVER, that DDSI Core Technology shall also include Technology acquired by
DDSI from a third party after the date of the closing of the Offering necessary
or useful to the development of the Spiros Products, except to the extent that
there are any limitations or restrictions on DDSI's ability to license or
sublicense such Technology.  "Owned or controlled" shall include Technology that
DDSI owns, or under which DDSI is licensed and has the right to grant
sublicenses and/or grant immunity from suit.

     "DDSI INDEMNITEE" shall mean DDSI, its successors and assigns, and the
directors, officers, employees, agents and counsel thereof.

     "DDSI PATENT RIGHTS" shall mean those certain inventions described in
claims of (a) the patent applications pending, filed by DDSI (or the rights to
which have been assigned to DDSI) as of the date of the Technology Agreement
relating to dry powder inhalers, powder storage systems and/or formulation
methods for dry powder inhalation, (b) any patent application constituting an
equivalent, counterpart, reissue, extension or continuation (including, without
limitation, a continuation in part or a subdivision) of any of the foregoing
patent applications and (c) any patent issued or issuing upon any of the
foregoing.

     "DESIGNATED COMPOUND(S)" shall mean any compounds for delivery using the
System selected by Spiros Corp. II, and agreed to be developed by DURA.

     "DEVELOPED TECHNOLOGY" shall mean any Technology including, without
limitation, any enhancements, substitutions or improvements to the Core
Technology that is (a) discovered, developed or otherwise acquired by DURA
pursuant to the terms of the Development Agreement or (b) otherwise acquired by
or on behalf of Spiros Corp. II during the term of the Development Agreement.

     "DEVELOPMENT" shall mean the further development of the Program Technology
for the purpose of identifying, developing, manufacturing, marketing and
commercializing Spiros Products and 

                                     SCHEDULE 1.1
<PAGE>


the making of the Other Expenditures.

     "DEVELOPMENT AGREEMENT" shall mean the Development Agreement dated as of 
December 22, 1997, between DURA and Spiros Corp., as amended, modified or 
supplemented from time to time.

     "DEVELOPMENT COSTS" shall mean the Direct Development Costs, the Indirect
Development Costs and the Other Expenditures.

     "DEVELOPMENT TERM" shall mean the period commencing on the Closing Date and
ending on the earlier of (a) the Option Closing Date or (b) the date the Option
terminates or expires other than by exercise.

     "DIRECT DEVELOPMENT COSTS" shall mean all costs incurred by DURA or its 
Affiliates in respect of the Development, other than Indirect Development 
Costs, determined in accordance with generally accepted accounting principles 
consistent with DURA's internal accounting system, allocated on a reasonable 
and consistent basis.  Direct Development Costs shall consist primarily of 
fully-burdened payroll costs (burdened to include benefits, payroll taxes and 
an allocation of facilities and overhead costs) and any other such costs 
generated internally by DURA in respect of the Development.

     "DPI" shall mean the motor-driven dry powder inhaler (other than an inahler
designed to deliver a single dose of a drug) developed by DURA, DDSI and/or
Spiros Corp. and to be developed by DURA and/or Spiros Corp. II.

     "DURA COMMON STOCK" shall mean the Common Stock of DURA, par value $.001
per share.  

     "DURA CORE TECHNOLOGY" shall mean (a) Technology owned or controlled by
DURA as of the date of the closing of the Offering necessary or useful to the
development of the Spiros Products, and (b) the DURA Patent Rights and DURA
Trademarks; PROVIDED, HOWEVER, that DURA Core Technology shall also include
Technology acquired by DURA from a third party after the date of the closing of
the Offering necessary or useful to the development of the Spiros Products,
except to the extent that there are any limitations or restrictions on DURA's
ability to license or sublicense such Technology.  "Owned or controlled" shall
include Technology that DURA owns, or under which DURA is licensed and has the
right to grant sublicenses and/or grant immunity from suit.

     "DURA INDEMNITEE" shall mean DURA, its successors and assigns, and the
directors, officers, employees, agents and counsel thereof.

     "DURA PATENT RIGHTS" shall mean those certain inventions described in
claims of (a) the patent applications pending, filed by DURA (or the rights to
which have been assigned to DURA) as of the date of the Technology Agreement
relating to DPIs, PSSs and/or formulation methods for dry powder inhalation, (b)
any 

                                     SCHEDULE 1.1
<PAGE>


patent application constituting an equivalent, counterpart, reissue,
extension or continuation (including, without limitation, a continuation in part
or a subdivision) of any of the foregoing patent applications and (c) any patent
issued or issuing upon any of the foregoing.

     "DURA TRADEMARKS" shall mean Spiros=TM=.

     "EVENT OF DEFAULT" shall mean any of the following events:  (a) at any
time, if DURA or Spiros Corp. II fails to perform or observe or otherwise
breaches any of its Material Obligations, and such failure or breach continues
unremedied for a period of sixty (60) days after receipt by of written notice
thereof from the other party; (b) at any time, effective as set forth in a
written notice from the other party if DURA or Spiros Corp. II shall (i) seek
the liquidation, reorganization, dissolution or winding-up of itself or the
composition or readjustment of its debts (other than pursuant to a merger with
an Affiliate), (ii) apply for or consent to the appointment of, or the taking
possession by, a receiver, custodian, trustee or liquidator for itself or of all
or a substantial part of its assets, (iii) make a general assignment for the
benefit of its creditors, (iv) commence a voluntary case under the Bankruptcy
Code, (v) file a petition seeking to take advantage of any other law relating to
bankruptcy, insolvency, reorganization, winding-up or composition or
readjustment of debts (other than pursuant to a merger with an Affiliate) or
(vi) adopt any resolution of its Board of Directors or shareholders for the
purpose of effecting any of the foregoing (other than pursuant to a merger with
an Affiliate); or (c) at any time, effective as set forth in a written notice
from the other party, if a proceeding or case shall be commenced without the
application or consent of DURA or Spiros Corp. II as applicable, and such
proceeding or case shall continue undismissed, or an order, judgment or decrees
approving or ordering any of the following shall be entered and continued
unstayed and in effect, for a period of sixty (60) days from and after the date
service of process is effected, seeking (i) DURA's or Spiros Corp. II's, as
applicable, liquidation, reorganization, dissolution or winding-up, or the
composition or readjustment of its debts, (ii) the appointment of a trustee,
receiver, custodian, liquidator or the like of DURA or Spiros Corp. II or for
all or any substantial part of its assets or (iii) similar relief in respect of
DURA or Spiros Corp. II under any law relating to bankruptcy, insolvency,
reorganization, winding-up or the composition or readjustment of debts.

     "FDA" shall mean the United States Food and Drug Administration or any
successor agency or authority, the approval of which is required to market
health care products in the United States.

     "FDA APPROVAL" shall mean the final regulatory approval of the FDA required
to commence commercial marketing of a health product.

                                     SCHEDULE 1.1

<PAGE>


     "FORCE MAJEURE" shall mean any act of God, any accident explosion, fire,
storm, earthquake, flood, drought, peril of the sea, riot, embargo, war or
foreign, federal, state or municipal order of general application, seizure,
requisition or allocation, any failure or delay of transportation, shortage of
or inability to obtain supplies, equipment, fuel or labor or any other
circumstance or event beyond the reasonable control of the party relying upon
such circumstance or event.

     "INDIRECT DEVELOPMENT COSTS" shall mean all costs, fees and out-of-pocket
or other expenses, including the purchase of any capital equipment related to
the Development, incurred or paid by DURA to a third party, other than an
Affiliate of DURA, in respect of the Development, determined in accordance with
generally accepted accounting principles consistent with DURA's internal
accounting system, allocated on a reasonable and consistent basis.

     "MANUFACTURING AND MARKETING AGREEMENT" shall mean the Manufacturing and 
Marketing Agreement dated as of December 22, 1997 between DURA and Spiros 
Corp. II, as amended, modified or supplemented from time to time.

     "MANUFACTURE" shall mean the manufacture and assembly of the Spiros
Products.

     "MATERIAL OBLIGATION" shall mean the material obligations of a party under
the Technology Agreement, the Development Agreement or the Manufacturing and
Marketing Agreement.

     "NET SALES" shall mean the gross amount invoiced for sales of Spiros
Products by DURA or its sublicensees, if any, to third parties less (i)
discounts actually allowed, (ii) credits for claims, allowances, retroactive
price reductions or returned Spiros Products, (iii) prepaid freight charges
incurred in transporting Spiros Products to customers, (iv) sales taxes and
other governmental charges actually paid in connection with the sales (but
excluding what is commonly known as income taxes) and (v) any royalty
obligations under the 1993 Royalty Agreement.  Net Sales shall not include sales
between or among DURA, its Affiliates and its sublicensees unless such sales are
for end use rather than for purposes of resale.

     "OFFERING" shall mean the underwritten public offering of the Units
pursuant to the Registration Statement.

     "OPTION PROCEEDS" shall have the meaning assigned to it in Section 3 of the
Albuterol and Product Option Agreement. 

     "OPTION PRODUCT" shall have the meaning assigned to it in Section 2.1 of
the Albuterol and Product Option Agreement.

     "OTHER EXPENDITURES" shall mean funds spent by Spiros Corp. II to acquire
capital equipment, develop a next generation inhaler system or to enhance the
System.

                                     SCHEDULE 1.1

<PAGE>


     "PATENT RIGHTS" shall mean any patents or patent applications within the
Spiros Corp. II Patent Rights, the DURA Patent Rights, the DDSI Patent Rights
and the Spiros Corp. Patent Rights.

     "PERSON" shall mean any individual, partnership, corporation, firm,
association, unincorporated organization, joint venture, trust or other entity.

     "PRODUCT OPTION" shall have the meaning assigned to it in Section 2.1 of
the Albuterol and Product Option Agreement. 

     "PRODUCT OPTION CLOSING DATE" shall have the meaning assigned to it in
Section 2.5 of the Albuterol and Product Option Agreement.

     "PROGRAM TECHNOLOGY" shall mean the Core Technology and the Developed
Technology.

     "PSS" shall mean the powder storage system developed and to be developed by
DURA for use with the DPI.

     "PURCHASE AGREEMENT" shall mean the Purchase Agreement dated as of 
December 16, 1997, among DURA, Spiros Corp. II, Merrill Lynch & Co., and 
Donaldson, Lufkin & Jenrette.  

     "PURCHASE OPTION" shall mean the option granted to the holder of Spiros
Corp. II's Special Common Stock to purchase all of the Spiros Corp. II Common
Stock as set forth in Article V of the Spiros Corp. II Charter.

     "PURCHASE OPTION CLOSING DATE" shall have the meaning assigned to it in
Article V of the Spiros Corp. II Charter.

     "PURCHASE OPTION EXERCISE PRICE" shall have the meaning assigned to it in
Article V of the Spiros Corp. II Charter 

     "REGISTRATION STATEMENT" shall mean the Registration Statement on Form 
S-1/S-3 filed by Spiros Corp. II and DURA dated October 10, 1997 (No. 333-
37673/333-37673-01), including all exhibits and any amendments thereof
and supplements thereto.

     "RESEARCH FUNDS" shall mean the Available Funds, less (i) all general and
administrative expenses including, without limitation, those paid or payable
pursuant to the Development Agreement or the Services Agreement, and the
reasonable out-of-pocket expenses of Spiros Corp. II directors and reasonable
compensation for Spiros Corp. II's independent directors, less (ii) any amounts
paid to DURA under the Development Agreement or the Services Agreement, less
(iii) any costs and expenses incurred in the defense or settlement of any action
or claim or in respect of a judgment thereon, and less (iv) One Million Dollars
($1,000,000) to be retained by Spiros Corp. II as working capital in the event
DURA does not exercise the Purchase Option.

                                     SCHEDULE 1.1

<PAGE>


     "SALE(S)" or "SELL" shall mean the activity undertaken by a sales
representative during a sales call on physicians, physician assistants, nurses,
hospitals, clinics, health maintenance organizations, preferred provider
organizations and managed care companies (including all forms of communication
not involving face to face contact by such sales representatives), describing
the FDA-approved indicated uses, safety, effectiveness, contraindications, side
effects, warnings and other relevant characteristics of the Spiros Product, in a
fair and balanced manner consistent with the requirements of the Federal Food,
Drug, and Cosmetic Act, as amended (and the regulations thereunder).  

     "SPIROS CASSETTE SYSTEM" shall mean a DPI in which the PSS is in the form
of a cassette.

     "SPIROS CORE TECHNOLOGY" shall mean (a) Technology owned or controlled by
Spiros Corp. as of the date of the closing of the Offering necessary or useful
to the development of the Spiros Products, and (b) the Spiros Corp. Patent
Rights; PROVIDED, HOWEVER, that Spiros Core Technology shall also include
Technology acquired by Spiros Corp. from a third party after the date of the
closing of the Offering necessary or useful to the development of the Spiros
Products, except to the extent that there are any limitations or restrictions on
Spiros Corp.'s ability to license or sublicense such Technology.  "Owned or
controlled" shall include Technology that Spiros Corp. owns, or under which
Spiros Corp. is licensed and has the right to grant sublicenses and/or grant
immunity from suit.

     "SPIROS CORP. INDEMNITEE" shall mean Spiros Corp., its successors and
assigns, and the directors, officers, employees, agents and counsel thereof.  

     "SPIROS CORP. PATENT RIGHTS" shall mean those certain inventions described
in claims of (a) the patent applications pending, filed by Spiros Corp. (or the
rights to which have been assigned to Spiros Corp.) as of the date of the
Technology Agreement relating to dry powder inhalers, powder storage systems
and/or formulation methods for dry powder inhalation, (b) any patent application
constituting an equivalent, counterpart, reissue, extension or continuation
(including, without limitation, a continuation in part or a subdivision) of any
of the foregoing patent applications and (c) any patent issued or issuing upon
any of the foregoing.

     "SPIROS CORP. II CHARTER" shall mean Amended and Restated Certificate of
Spiros Development Corporation II, Inc. in effect as of the closing of the
Offering, as amended from time to time.

     "SPIROS CORP. II COMMON STOCK" shall mean the Callable Common Stock of
Spiros Corp. II, $.001 par value.

     "SPIROS CORP. II INDEMNITEE" shall mean Spiros Corp. II, its 

                                     SCHEDULE 1.1

<PAGE>


successors and assigns, and the directors, officers, employees, agents and 
counsel thereof.

     "SPIROS CORP. II PATENT RIGHTS" shall mean those certain inventions
described in claims of (a) any patent application having one or more claims
covering Developed Technology, (b) any patent application constituting an
equivalent, counterpart, reissue, extension or continuation (including, without
limitation, a continuation in part or a subdivision) of any of the foregoing
applications or (c) any patent issued or issuing upon any of the foregoing
applications.

     "SPIROS PRODUCT(S)" shall mean (a) any System used with a formulation of
albuterol, beclomethasone, ipratropium, an albuterol-ipratropium combination,
budesonide or a Designated Compound developed, produced, manufactured or
marketed by DURA on behalf of Spiros Corp. II using the Program Technology.

     "SPIROS PRODUCT PROGRAM ASSETS" shall have the meaning assigned to it in
Section 2.1 of the Albuterol and Product Option Agreement.

     "SYSTEM" shall mean the DPI and the PSS when used together.

     "TECHNOLOGY" shall mean, solely with respect to motor-driven dry powder
inhalers and powder storage systems for drugs for delivery through such
inhalers, the manufacture thereof, and formulations of drugs to be delivered
through such inhalers, public and nonpublic technical or other information,
trade secrets, know-how, processes, formulations, concepts, ideas, preclinical,
clinical, pharmacological or other data and testing results, experimental
methods, or results, assays, descriptions, business or scientific plans,
depictions, customer lists and any other written, printed or electronically
stored materials, pharmaceutical compounds or any other natural or man-made
pharmaceutical materials and any and all other intellectual  property, including
patents and patent applications, of any nature whatsoever.  The term
"Technology" shall include, without limitation, any of the foregoing as it
relates to enhancements of, substitutions for or improvements to the Core
Technology.

     "TECHNOLOGY AGREEMENT" shall mean the Technology License Agreement dated as
of December 22, 1997, among DURA, DDSI, Spiros Corp. and Spiros Corp. II, as
amended, modified or supplemented from time to time.

     "TERRITORY" shall mean the entire world.
     
     "UNDERWRITERS" shall have the meaning assigned to it in the Registration
Statement.

     "UNITS" shall mean units, each consisting of one share of Spiros Corp. II
Common Stock and one warrant to purchase one-fourth of one share of DURA Common
Stock, all as described in the Registration Statement.

                                     SCHEDULE 1.1

<PAGE>


     "1993 ROYALTY AGREEMENT" shall have the meaning assigned to it in the
Registration Statement.
























                                     SCHEDULE 1.1



<PAGE>


                               SERVICES AGREEMENT


     SERVICES AGREEMENT (this "Agreement") made as of the 22 day of December,
1997, among DURA PHARMACEUTICALS, INC., a Delaware corporation ("DURA"), and
SPIROS DEVELOPMENT CORPORATION II, INC., a Delaware corporation ("Spiros Corp.
II").

WHEREAS:

     DURA and Spiros Corp. II desire to provide the services described herein on
the terms set forth herein.  Any capitalized terms not defined herein shall have
the meaning assigned to such terms in the Glossary attached as SCHEDULE 1.1 to
this Agreement.

NOW IT IS HEREBY AGREED AS FOLLOWS:

     1.   SERVICES.  Upon the request of Spiros Corp. II from time to time, DURA
will supply Spiros Corp. II with management and administrative services as
mutually agreed upon.  Such services will be provided at reasonable times and
upon reasonable notice, as mutually agreed to by the parties.

     2.   COMPENSATION.  Spiros Corp. II shall pay to DURA a fee of $100,000,
quarterly in arrears within 30 days of the date of the invoice received from
DURA for the services provided.

     3.   REIMBURSEMENT.  Upon the consummation of the Offering, Spiros Corp. II
shall reimburse DURA for all out-of-pocket expenses incurred by DURA in
connection with the services provided hereunder, including those out-of-pocket
expenses incurred pursuant to the Offering.  In addition, Spiros Corp. II shall
reimburse DURA for its direct and indirect costs, including the fully burdened
cost of labor for DURA's employees that performed services in connection with
the Offering.

     4.   TERM AND TERMINATION.

          A.   This Agreement shall terminate upon the later of (i) one year 
after the termination of the Purchase Option (as defined in the Prospectus 
relating to the Offering) or (ii) upon the exercise of the Purchase Option. 
This Agreement can be terminated by Spiros Corp. II at any time after 
termination of the Purchase Option.  Either party may, in its discretion, 
terminate this Agreement in the event that the Technology Agreement, 
Development Agreement or Manufacturing and Marketing Agreement terminates as 
a result of an Event of Default by the other party.

          B.   Notwithstanding the foregoing, in the event that the Offering is
not

<PAGE>

consummated and is withdrawn, this Agreement shall terminate and be of no
further force and effect.

     5.   INDEMNIFICATION OF DURA.  Spiros Corp. II hereby agrees to indemnify,
protect and hold DURA harmless from any and all liabilities, costs or expenses
incurred by DURA as a result of services rendered by DURA under this Agreement,
including lawsuits of and claims by third parties, except for liabilities, costs
or expenses resulting from DURA's own negligence or wilful misconduct.

     6.   FORCE MAJEURE.  DURA shall not be liable for delay in performance of
any of its obligations hereunder if such delay is due to causes beyond its
reasonable control including, without limitation, acts of God, fires, strikes,
acts of ware, or intervention of any government or authority; provided, however,
that any such delay or failure shall be remedied by such party as soon as
possible.

     7.   RELATIONSHIP OF THE PARTIES.  Nothing contained in this Agreement is
intended or is to be construed to constitute DURA and Spiros Corp. II as
partners or joint venturers or DURA as an employee of Spiros Corp. II.  Neither
party hereto shall have any express or implied right or authority to assume or
create any obligations on behalf of or in the name of the other party or to bind
the other party to any contract, agreement or undertaking with any third party.

     8.   COUNTERPARTS.  This Agreement may be executed in any number of
counterparts, each of which when so executed shall be deemed to be an original
and all of which when taken together shall constitute this Agreement.

     9.   NOTICES.  Any notice or other communication required or permitted to
be given to any party under this Agreement shall be given in writing and shall
be delivered by hand or by registered mail, postage prepaid and return receipt
requested, or by reputable overnight delivery service or courier, addressed to
each party at the following addresses or such other address as may be designated
by notice pursuant to this Section 9:

If to Spiros Corp. II:        Spiros Corporation II, Inc.
                              c/o Dura Pharmaceuticals, Inc.
                              7475 Lusk Boulevard
                              San Diego, CA 92121
                              Attention:  President


                                       -2-

<PAGE>

If to DURA:                   Dura Pharmaceuticals, Inc.
                              7475 Lusk Boulevard
                              San Diego, CA 92121
                              Attention:  President
                                   with a copy to the attention
                                   of General Counsel

Any notice or communication given in conformity with this Section 9 shall be
deemed to be effective when received by the addressee, if delivered by hand or
delivery service or courier, and three days after mailing, if mailed.

     10.  GOVERNING LAW.  This Agreement shall be governed by and construed in
accordance with the laws of the State of California applicable to contracts to
be performed wholly within the State of California.  Except as otherwise
provided herein, any claim or controversy arising out of or related to this
Agreement or any breach thereof shall be submitted to a court of competent
jurisdiction in the State of California and the parties hereby consent to the
jurisdiction and venue of such court.

     11.  SEVERABILITY.  If any provision in this Agreement is deemed to be or
becomes invalid, illegal or unenforceable in any jurisdiction, (i) such
provision will be deemed amended in such jurisdiction to conform to applicable
laws of such jurisdiction so as to be valid and enforceable or, it cannot be so
amended without materiality altering the intention of the parties, it will be
deleted, (ii) the validity, legality and enforceability of such provision will
not in any way be affected or impaired thereby in any other jurisdiction and
(iii) the remaining provisions of this Agreement shall continue in full force
without being impaired or invalidated in any way.

     12.  AMENDMENTS.  No amendment, modification or addition hereto shall be
effective or binding on either party unless set forth in writing and executed by
a duly authorized representative of both parties.

     13.  WAIVER.  No waiver of any right under this Agreement shall be deemed
effective unless contained in a writing signed by the party charged with such
waiver, and no waiver of any breach or failure to perform shall be deemed to be
a waiver of any future breach or failure to perform or of any other right
arising under this Agreement.

     14.  HEADINGS.  The section headings contained in this Agreement are
included for convenience only and form no part of the agreement between the
parties.

     15.  ASSIGNMENT.  Neither party may assign its rights and obligations
hereunder without the prior written consent of the other party, which consent
may not be unreasonably withheld; provided, however, that DURA may assign such
rights and obligations hereunder to an Affiliate or to any person or entity with
which DURA is merged or consolidated or which

                                       -3-

<PAGE>

purchases all or substantially all of the assets of DURA.  DURA may subcontract
all or any portion of its duties hereunder to third parties, in its sole
discretion; provided, however, that any such subcontractor shall be bound by the
terms of this Agreement.

     16.  NO EFFECT ON OTHER AGREEMENTS.  No provision of this Agreement shall
be construed so as to negate, modify or affect in any way the provisions of any
other agreement between the parties unless specifically referred to, and solely
to the extent provided, in any such other agreement.

                [REMAINDER OF THIS PAGE INTENTIONALLY LEFT BLANK]

                                       -4-

<PAGE>

     IN WITNESS WHEREOF, the parties hereto have executed this Agreement on the
date first set forth above.

                         DURA PHARMACEUTICALS, INC.,
                         a Delaware corporation



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


                         SPIROS DEVELOPMENT CORPORATION II, INC.,
                         a Delaware corporation



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







                     [SIGNATURE PAGE TO SERVICES AGREEMENT]


<PAGE>

                                  SCHEDULE 1.1

                                    GLOSSARY








                                  SCHEDULE 1.1

<PAGE>

                                  SCHEDULE 1.1

                                    GLOSSARY

     "AFFILIATE" of a person shall mean a Person that directly, or indirectly
through one or more intermediaries, controls, is controlled by or is under
common control with such Person.  "Control" (and, with correlative meanings, the
terms "controlled by" and "under common control with") shall mean the possession
of the power to direct or cause the direction of the management and policies of
such Person, whether through the ownership of voting stock, by contract or
otherwise.  In the case of a corporations, "control" shall mean, among other
things, the direct or indirect ownership of more than fifty percent (50%) of its
outstanding voting stock.

     "AGREEMENTS" shall mean the Manufacturing and Marketing Agreement, the
Technology Agreement and the Development Agreement.  

     "ALBUTEROL OPTION" shall have the meaning assigned to it in Section 1.1 of
the Albuterol and Product Option Agreement.

     "ALBUTEROL AND PRODUCT OPTION AGREEMENT" shall mean the Albuterol and
Product Option Agreement dated as of December 22, 1997, between DURA and Spiros
Corp. II, as amended, modified or supplemented from time to time.

     "ALBUTEROL OPTION CLOSING DATE" shall have the meaning assigned to it in
Section 1.5 of the Albuterol and Product Option Agreement.

     "ALBUTEROL PROGRAM ASSETS" shall have the meaning assigned to it in Section
1.1 of the Albuterol and Product Option Agreement.

     "ALBUTEROL PRODUCT" shall have the meaning assigned to it in Section 1.1 of
the Albuterol and Product Option Agreement.

     "AVAILABLE FUNDS" shall mean the sum of (a) the net proceeds to Spiros
Corp. II from the sale of the Units in the Offering and the Contribution, (b)
all royalties remitted to Spiros Corp. II by DURA (or its Affiliates) from the
Sale of Spiros Products pursuant to the Agreements, (c) the Option Proceeds, if
any, (d) any other amounts provided by DURA to Spiros Corp. II, if any and (e)
interest or other income earned through temporary investment of the amounts
described in clauses (a), (b), (c) or (d).

     "BANKRUPTCY CODE" shall mean the United States Bankruptcy Code, as amended
from time to time.

     "CLAIM" shall mean any and all liabilities, damages, losses, settlements,
claims, actions, suits, penalties, fines, costs or expenses (including, without
limitation, reasonable attorneys' fees).

                                  SCHEDULE 1.1
<PAGE>

     "CONFIDENTIAL INFORMATION" shall mean all Program Technology disclosed by
DURA (and its Affiliates) to Spiros Corp. II or by Spiros Corp. II to DURA
pursuant to the Agreements or the Services Agreement.

     "CONTRIBUTION" shall have the meaning assigned in Section 5.2 of the
Development Agreement.

     "CORE TECHNOLOGY" shall mean the DURA Core Technology, the DDSI Core
Technology and the Spiros Core Technology.

     "DDSI CORE TECHNOLOGY" shall mean (a) Technology owned or controlled by
DDSI as of the date of the closing of the Offering necessary or useful to the
development of the Spiros Products, and (b) the DDSI Patent Rights; PROVIDED,
HOWEVER, that DDSI Core Technology shall also include Technology acquired by
DDSI from a third party after the date of the closing of the Offering necessary
or useful to the development of the Spiros Products, except to the extent that
there are any limitations or restrictions on DDSI's ability to license or
sublicense such Technology.  "Owned or controlled" shall include Technology that
DDSI owns, or under which DDSI is licensed and has the right to grant
sublicenses and/or grant immunity from suit.

     "DDSI INDEMNITEE" shall mean DDSI, its successors and assigns, and the
directors, officers, employees, agents and counsel thereof.

     "DDSI PATENT RIGHTS" shall mean those certain inventions described in
claims of (a) the patent applications pending, filed by DDSI (or the rights to
which have been assigned to DDSI) as of the date of the Technology Agreement
relating to dry powder inhalers, powder storage systems and/or formulation
methods for dry powder inhalation, (b) any patent application constituting an
equivalent, counterpart, reissue, extension or continuation (including, without
limitation, a continuation in part or a subdivision) of any of the foregoing
patent applications and (c) any patent issued or issuing upon any of the
foregoing.

     "DESIGNATED COMPOUND(S)" shall mean any compounds for delivery using the
System selected by Spiros Corp. II, and agreed to be developed by DURA.

     "DEVELOPED TECHNOLOGY" shall mean any Technology including, without
limitation, any enhancements, substitutions or improvements to the Core
Technology that is (a) discovered, developed or otherwise acquired by DURA
pursuant to the terms of the Development Agreement or (b) otherwise acquired by
or on behalf of Spiros Corp. II during the term of the Development Agreement.

     "DEVELOPMENT" shall mean the further development of the Program Technology
for the purpose of identifying, developing, manufacturing, marketing and
commercializing Spiros Products and 

                                  SCHEDULE 1.1
<PAGE>

the making of the Other Expenditures.

     "DEVELOPMENT AGREEMENT" shall mean the Development Agreement dated as of 
December 22, 1997, between DURA and Spiros Corp., as amended, modified or 
supplemented from time to time.

     "DEVELOPMENT COSTS" shall mean the Direct Development Costs, the Indirect
Development Costs and the Other Expenditures.

     "DEVELOPMENT TERM" shall mean the period commencing on the Closing Date and
ending on the earlier of (a) the Option Closing Date or (b) the date the Option
terminates or expires other than by exercise.

     "DIRECT DEVELOPMENT COSTS" shall mean all costs incurred by DURA or its 
Affiliates in respect of the Development, other than Indirect Development 
Costs, determined in accordance with generally accepted accounting principles 
consistent with DURA's internal accounting system, allocated on a reasonable 
and consistent basis.  Direct Development Costs shall consist primarily of 
fully-burdened payroll costs (burdened to include benefits, payroll taxes and 
an allocation of facilities and overhead costs) and any other such costs 
generated internally by DURA in respect of the Development.

     "DPI" shall mean the motor-driven dry powder inhaler (other than an inahler
designed to deliver a single dose of a drug) developed by DURA, DDSI and/or
Spiros Corp. and to be developed by DURA and/or Spiros Corp. II.

     "DURA COMMON STOCK" shall mean the Common Stock of DURA, par value $.001
per share.  

     "DURA CORE TECHNOLOGY" shall mean (a) Technology owned or controlled by
DURA as of the date of the closing of the Offering necessary or useful to the
development of the Spiros Products, and (b) the DURA Patent Rights and DURA
Trademarks; PROVIDED, HOWEVER, that DURA Core Technology shall also include
Technology acquired by DURA from a third party after the date of the closing of
the Offering necessary or useful to the development of the Spiros Products,
except to the extent that there are any limitations or restrictions on DURA's
ability to license or sublicense such Technology.  "Owned or controlled" shall
include Technology that DURA owns, or under which DURA is licensed and has the
right to grant sublicenses and/or grant immunity from suit.

     "DURA INDEMNITEE" shall mean DURA, its successors and assigns, and the
directors, officers, employees, agents and counsel thereof.

     "DURA PATENT RIGHTS" shall mean those certain inventions described in
claims of (a) the patent applications pending, filed by DURA (or the rights to
which have been assigned to DURA) as of the date of the Technology Agreement
relating to DPIs, PSSs and/or formulation methods for dry powder inhalation, (b)
any 

                                  SCHEDULE 1.1
<PAGE>

patent application constituting an equivalent, counterpart, reissue,
extension or continuation (including, without limitation, a continuation in part
or a subdivision) of any of the foregoing patent applications and (c) any patent
issued or issuing upon any of the foregoing.

     "DURA TRADEMARKS" shall mean Spiros-TM-.

     "EVENT OF DEFAULT" shall mean any of the following events:  (a) at any
time, if DURA or Spiros Corp. II fails to perform or observe or otherwise
breaches any of its Material Obligations, and such failure or breach continues
unremedied for a period of sixty (60) days after receipt by of written notice
thereof from the other party; (b) at any time, effective as set forth in a
written notice from the other party if DURA or Spiros Corp. II shall (i) seek
the liquidation, reorganization, dissolution or winding-up of itself or the
composition or readjustment of its debts (other than pursuant to a merger with
an Affiliate), (ii) apply for or consent to the appointment of, or the taking
possession by, a receiver, custodian, trustee or liquidator for itself or of all
or a substantial part of its assets, (iii) make a general assignment for the
benefit of its creditors, (iv) commence a voluntary case under the Bankruptcy
Code, (v) file a petition seeking to take advantage of any other law relating to
bankruptcy, insolvency, reorganization, winding-up or composition or
readjustment of debts (other than pursuant to a merger with an Affiliate) or
(vi) adopt any resolution of its Board of Directors or shareholders for the
purpose of effecting any of the foregoing (other than pursuant to a merger with
an Affiliate); or (c) at any time, effective as set forth in a written notice
from the other party, if a proceeding or case shall be commenced without the
application or consent of DURA or Spiros Corp. II as applicable, and such
proceeding or case shall continue undismissed, or an order, judgment or decrees
approving or ordering any of the following shall be entered and continued
unstayed and in effect, for a period of sixty (60) days from and after the date
service of process is effected, seeking (i) DURA's or Spiros Corp. II's, as
applicable, liquidation, reorganization, dissolution or winding-up, or the
composition or readjustment of its debts, (ii) the appointment of a trustee,
receiver, custodian, liquidator or the like of DURA or Spiros Corp. II or for
all or any substantial part of its assets or (iii) similar relief in respect of
DURA or Spiros Corp. II under any law relating to bankruptcy, insolvency,
reorganization, winding-up or the composition or readjustment of debts.

     "FDA" shall mean the United States Food and Drug Administration or any
successor agency or authority, the approval of which is required to market
health care products in the United States.

     "FDA APPROVAL" shall mean the final regulatory approval of the FDA required
to commence commercial marketing of a health product.

                                  SCHEDULE 1.1
<PAGE>

     "FORCE MAJEURE" shall mean any act of God, any accident explosion, fire,
storm, earthquake, flood, drought, peril of the sea, riot, embargo, war or
foreign, federal, state or municipal order of general application, seizure,
requisition or allocation, any failure or delay of transportation, shortage of
or inability to obtain supplies, equipment, fuel or labor or any other
circumstance or event beyond the reasonable control of the party relying upon
such circumstance or event.

     "INDIRECT DEVELOPMENT COSTS" shall mean all costs, fees and out-of-pocket
or other expenses, including the purchase of any capital equipment related to
the Development, incurred or paid by DURA to a third party, other than an
Affiliate of DURA, in respect of the Development, determined in accordance with
generally accepted accounting principles consistent with DURA's internal
accounting system, allocated on a reasonable and consistent basis.

     "MANUFACTURING AND MARKETING AGREEMENT" shall mean the Manufacturing and 
Marketing Agreement dated as of December 22, 1997 between DURA and Spiros 
Corp. II, as amended, modified or supplemented from time to time.

     "MANUFACTURE" shall mean the manufacture and assembly of the Spiros
Products.

     "MATERIAL OBLIGATION" shall mean the material obligations of a party under
the Technology Agreement, the Development Agreement or the Manufacturing and
Marketing Agreement.

     "NET SALES" shall mean the gross amount invoiced for sales of Spiros
Products by DURA or its sublicensees, if any, to third parties less (i)
discounts actually allowed, (ii) credits for claims, allowances, retroactive
price reductions or returned Spiros Products, (iii) prepaid freight charges
incurred in transporting Spiros Products to customers, (iv) sales taxes and
other governmental charges actually paid in connection with the sales (but
excluding what is commonly known as income taxes) and (v) any royalty
obligations under the 1993 Royalty Agreement.  Net Sales shall not include sales
between or among DURA, its Affiliates and its sublicensees unless such sales are
for end use rather than for purposes of resale.

     "OFFERING" shall mean the underwritten public offering of the Units
pursuant to the Registration Statement.

     "OPTION PROCEEDS" shall have the meaning assigned to it in Section 3 of the
Albuterol and Product Option Agreement. 

     "OPTION PRODUCT" shall have the meaning assigned to it in Section 2.1 of
the Albuterol and Product Option Agreement.

     "OTHER EXPENDITURES" shall mean funds spent by Spiros Corp. II to acquire
capital equipment, develop a next generation inhaler system or to enhance the
System.

                                  SCHEDULE 1.1
<PAGE>

     "PATENT RIGHTS" shall mean any patents or patent applications within the
Spiros Corp. II Patent Rights, the DURA Patent Rights, the DDSI Patent Rights
and the Spiros Corp. Patent Rights.

     "PERSON" shall mean any individual, partnership, corporation, firm,
association, unincorporated organization, joint venture, trust or other entity.

     "PRODUCT OPTION" shall have the meaning assigned to it in Section 2.1 of
the Albuterol and Product Option Agreement. 

     "PRODUCT OPTION CLOSING DATE" shall have the meaning assigned to it in
Section 2.5 of the Albuterol and Product Option Agreement.

     "PROGRAM TECHNOLOGY" shall mean the Core Technology and the Developed
Technology.

     "PSS" shall mean the powder storage system developed and to be developed by
DURA for use with the DPI.

     "PURCHASE AGREEMENT" shall mean the Purchase Agreement dated as of
December 16, 1997, among DURA, Spiros Corp. II, Merrill Lynch & Co., and
Donaldson, Lufkin & Jenrette.  

     "PURCHASE OPTION" shall mean the option granted to the holder of Spiros
Corp. II's Special Common Stock to purchase all of the Spiros Corp. II Common
Stock as set forth in Article V of the Spiros Corp. II Charter.

     "PURCHASE OPTION CLOSING DATE" shall have the meaning assigned to it in
Article V of the Spiros Corp. II Charter.

     "PURCHASE OPTION EXERCISE PRICE" shall have the meaning assigned to it in
Article V of the Spiros Corp. II Charter 

     "REGISTRATION STATEMENT" shall mean the Registration Statement on Form S-
1/S-3 filed by Spiros Corp. II and DURA dated October 10, 1997 (No. 333-
37673/333-37673-01), including all exhibits and any amendments thereof
and supplements thereto.

     "RESEARCH FUNDS" shall mean the Available Funds, less (i) all general and
administrative expenses including, without limitation, those paid or payable
pursuant to the Development Agreement or the Services Agreement, and the
reasonable out-of-pocket expenses of Spiros Corp. II directors and reasonable
compensation for Spiros Corp. II's independent directors, less (ii) any amounts
paid to DURA under the Development Agreement or the Services Agreement, less
(iii) any costs and expenses incurred in the defense or settlement of any action
or claim or in respect of a judgment thereon, and less (iv) One Million Dollars
($1,000,000) to be retained by Spiros Corp. II as working capital in the event
DURA does not exercise the Purchase Option.

                                  SCHEDULE 1.1
<PAGE>

     "SALE(S)" or "SELL" shall mean the activity undertaken by a sales
representative during a sales call on physicians, physician assistants, nurses,
hospitals, clinics, health maintenance organizations, preferred provider
organizations and managed care companies (including all forms of communication
not involving face to face contact by such sales representatives), describing
the FDA-approved indicated uses, safety, effectiveness, contraindications, side
effects, warnings and other relevant characteristics of the Spiros Product, in a
fair and balanced manner consistent with the requirements of the Federal Food,
Drug, and Cosmetic Act, as amended (and the regulations thereunder).  

     "SPIROS CASSETTE SYSTEM" shall mean a DPI in which the PSS is in the form
of a cassette.

     "SPIROS CORE TECHNOLOGY" shall mean (a) Technology owned or controlled by
Spiros Corp. as of the date of the closing of the Offering necessary or useful
to the development of the Spiros Products, and (b) the Spiros Corp. Patent
Rights; PROVIDED, HOWEVER, that Spiros Core Technology shall also include
Technology acquired by Spiros Corp. from a third party after the date of the
closing of the Offering necessary or useful to the development of the Spiros
Products, except to the extent that there are any limitations or restrictions on
Spiros Corp.'s ability to license or sublicense such Technology.  "Owned or
controlled" shall include Technology that Spiros Corp. owns, or under which
Spiros Corp. is licensed and has the right to grant sublicenses and/or grant
immunity from suit.

     "SPIROS CORP. INDEMNITEE" shall mean Spiros Corp., its successors and
assigns, and the directors, officers, employees, agents and counsel thereof.  

     "SPIROS CORP. PATENT RIGHTS" shall mean those certain inventions described
in claims of (a) the patent applications pending, filed by Spiros Corp. (or the
rights to which have been assigned to Spiros Corp.) as of the date of the
Technology Agreement relating to dry powder inhalers, powder storage systems
and/or formulation methods for dry powder inhalation, (b) any patent application
constituting an equivalent, counterpart, reissue, extension or continuation
(including, without limitation, a continuation in part or a subdivision) of any
of the foregoing patent applications and (c) any patent issued or issuing upon
any of the foregoing.

     "SPIROS CORP. II CHARTER" shall mean Amended and Restated Certificate of
Spiros Development Corporation II, Inc. in effect as of the closing of the
Offering, as amended from time to time.

     "SPIROS CORP. II COMMON STOCK" shall mean the Callable Common Stock of
Spiros Corp. II, $.001 par value.

     "SPIROS CORP. II INDEMNITEE" shall mean Spiros Corp. II, its 

                                  SCHEDULE 1.1
<PAGE>

successors and assigns, and the directors, officers, employees, agents and 
counsel thereof.

     "SPIROS CORP. II PATENT RIGHTS" shall mean those certain inventions
described in claims of (a) any patent application having one or more claims
covering Developed Technology, (b) any patent application constituting an
equivalent, counterpart, reissue, extension or continuation (including, without
limitation, a continuation in part or a subdivision) of any of the foregoing
applications or (c) any patent issued or issuing upon any of the foregoing
applications.

     "SPIROS PRODUCT(S)" shall mean (a) any System used with a formulation of
albuterol, beclomethasone, ipratropium, an albuterol-ipratropium combination,
budesonide or a Designated Compound developed, produced, manufactured or
marketed by DURA on behalf of Spiros Corp. II using the Program Technology.

     "SPIROS PRODUCT PROGRAM ASSETS" shall have the meaning assigned to it in
Section 2.1 of the Albuterol and Product Option Agreement.

     "SYSTEM" shall mean the DPI and the PSS when used together.

     "TECHNOLOGY" shall mean, solely with respect to motor-driven dry powder
inhalers and powder storage systems for drugs for delivery through such
inhalers, the manufacture thereof, and formulations of drugs to be delivered
through such inhalers, public and nonpublic technical or other information,
trade secrets, know-how, processes, formulations, concepts, ideas, preclinical,
clinical, pharmacological or other data and testing results, experimental
methods, or results, assays, descriptions, business or scientific plans,
depictions, customer lists and any other written, printed or electronically
stored materials, pharmaceutical compounds or any other natural or man-made
pharmaceutical materials and any and all other intellectual  property, including
patents and patent applications, of any nature whatsoever.  The term
"Technology" shall include, without limitation, any of the foregoing as it
relates to enhancements of, substitutions for or improvements to the Core
Technology.

     "TECHNOLOGY AGREEMENT" shall mean the Technology License Agreement dated as
of December 22, 1997, among DURA, DDSI, Spiros Corp. and Spiros Corp. II, as
amended, modified or supplemented from time to time.

     "TERRITORY" shall mean the entire world.
     
     "UNDERWRITERS" shall have the meaning assigned to it in the Registration
Statement.

     "UNITS" shall mean units, each consisting of one share of Spiros Corp. II
Common Stock and one warrant to purchase one-fourth of one share of DURA Common
Stock, all as described in the Registration Statement.

                                  SCHEDULE 1.1
<PAGE>

     "1993 ROYALTY AGREEMENT" shall have the meaning assigned to it in the
Registration Statement.







                                  SCHEDULE 1.1

<PAGE>


           Spiros Development Corporation II, Inc. 1997 Stock Option Plan.
                                          

<PAGE>


                     SPIROS DEVELOPMENT CORPORATION II, INC.
                             1997 STOCK OPTION PLAN


                                   ARTICLE ONE

                               GENERAL PROVISIONS


   I.     PURPOSE OF THE PLAN

          This 1997 Stock Option Plan is intended to promote the interests of
Spiros Development Corporation II, Inc., a Delaware corporation, by providing
eligible persons with the opportunity to acquire a proprietary interest, or
otherwise increase their proprietary interest, in the Corporation as an
incentive for them to remain in the service of the Corporation.

          Capitalized terms shall have the meanings assigned to such terms in
the attached Appendix.

   II.    STRUCTURE OF THE PLAN

          A.   The Plan shall be comprised of a Discretionary Option Grant
Program under which eligible persons may, at the discretion of the Plan
Administrator, be granted options to purchase shares of Common Stock. 

          B.   The Plan shall become effective on the date on which the Common
Stock is first registered under Section 12 of the 1934 Act (the "Plan Effective
Date"), and options may be granted at any time from and after the Plan Effective
Date until the date the Plan terminates in accordance with the provisions of
Section III of Article Three. 

   III.   ADMINISTRATION OF THE PLAN

          A.   The Primary Committee shall have sole and exclusive authority to
administer the Discretionary Option Grant Program with respect to Section 16
Insiders. Administration of the Discretionary Option Grant Program with respect
to all other persons eligible to participate in those programs may, at the
Board's discretion, be vested in the Primary Committee or a Secondary Committee,
or the Board may retain the power to administer the program with respect to all
those other persons. 

          B.   Members of the Primary Committee or any Secondary Committee shall
serve for such period of time as the Board may determine and may be removed by
the Board at any time.  The Board may also at any time terminate the functions
of any Secondary Committee and reassume all powers and authority previously
delegated to such committee.

<PAGE>

          C.   Each Plan Administrator shall, within the scope of its
administrative functions under the Plan, have full power and authority (subject
to the provisions of the Plan) to establish such rules and regulations as it may
deem appropriate for proper administration of the Discretionary Option Grant
Program and to make such determinations under, and issue such interpretations
of, the provisions of such programs and any outstanding options or stock
issuances thereunder as it may deem necessary or advisable.  Decisions of the
Plan Administrator within the scope of its administrative functions under the
Plan shall be final and binding on all parties who have an interest in the
Discretionary Option Grant Program under its jurisdiction or any outstanding
option thereunder.

          D.   Service on the Primary Committee or the Secondary Committee shall
constitute service as a Board member, and members of each such committee shall
accordingly be entitled to full indemnification and reimbursement as Board
members for their service on such committee.  No member of the Primary Committee
or the Secondary Committee shall be liable for any act or omission made in good
faith with respect to the Plan or any option grants or stock issuances under the
Plan.

   IV.    ELIGIBILITY

          A.   The persons eligible to participate in the Discretionary Option
Grant Program are as follows:

                 (i)     Employees,

                (ii)     non-employee members of the Board or the board of
     directors of any Parent or Subsidiary, and

               (iii)     consultants and other independent advisors who
     provide services to the Corporation (or any Parent or Subsidiary).

          B.   Each Plan Administrator shall, within the scope of its
administrative jurisdiction under the Plan, have full authority to determine,
which eligible persons are to receive option grants, the time or times when such
option grants are to be made, the number of shares to be covered by each such
grant, the status of the granted option as either an Incentive Option or a Non-
Statutory Option, the time or times when each option is to become exercisable
and the maximum term for which the option is to remain outstanding.

   V.     STOCK SUBJECT TO THE PLAN

          A.   The stock issuable under the Plan shall be shares of 
authorized but unissued or reacquired Common Stock, including shares 
repurchased by the Corporation on the open market. The maximum number of 
shares of Common Stock which may be issued over the term of the Plan shall 
initially not exceed 700,000 shares (the "Overall Limitation").

                                       2
<PAGE>

          B.   The Overall Limitation under the Plan shall automatically 
increase on February 15 of each calendar year during the term of the Plan, 
beginning with the 1998 calendar year, by that number of shares necessary to 
cause the Overall Limitation to be equal to 15% of the then outstanding 
shares of the Common Stock of the Company. No Incentive Options may be 
granted on the basis of the additional shares of Common Stock resulting from 
such annual increases.

          C.   No one person participating in the Plan may receive options, 
separately exercisable stock appreciation rights and direct stock issuances 
for more than 200,000 shares of Common Stock in the aggregate per calendar 
year, beginning with the 1997 calendar year.

          D.   Shares of Common Stock subject to outstanding options shall be 
available for subsequent issuance under the Plan to the extent (i) the 
options (including any options incorporated from the predecessor Plan) expire 
or terminate for any reason prior to exercise in full or (ii) the options are 
cancelled in accordance with the cancellation-regrant provisions of Article 
Two. All shares issued under the Plan (including shares issued upon exercise 
of options incorporated from the Predecessor Plan), whether or not those 
shares are subsequently repurchased by the Corporation pursuant to its 
repurchase rights under the Plan, shall reduce on a share-for-share basis the 
number of shares of Common Stock available for subsequent issuance under the 
Plan. In addition, should the exercise price of an option under the Plan 
(including any option incorporated from the Predecessor Plan) be paid with 
shares of Common Stock or should shares of Common Stock otherwise issuable 
under the Plan be withheld by the Corporation in satisfaction of the 
withholding taxes incurred in connection with the exercise of an option or 
the vesting of a stock issuance under the Plan, then the number of shares of 
Common Stock available for issuance under the Plan shall be reduced by the gross
number of shares for which the option is exercised or which vest under the 
stock issuance, and not by the net number of shares of Common Stock issued to 
the holder of such option or stock issuance.

          E.   Should any change be made to the Common Stock by reason of any 
stock split, stock dividend, recapitalization, combination of shares, 
exchange of shares or other change affecting the outstanding Common Stock as 
a class without the Corporation's receipt of consideration, appropriate 
adjustments shall be made to (i) the maximum number and/or class of 
securities issuable under the Plan, (ii) the maximum number and/or class of 
securities for which the share reserve is to increase automatically each 
year, (iii) the number and/or class of securities for which any one person 
may be granted options, separately exercisable stock appreciation rights and 
direct stock issuances per calendar year, (iv) the number and/or class of 
securities for which automatic option grants are to be made subsequently per 
Eligible Director under the Automatic Option Grant Program and (v) the number 
and/or class of securities and the exercise price per share in effect under 
each outstanding option (including any option incorporated from the 
Predecessor Plan) in order to prevent the dilution or enlargement of benefits 
thereunder. The adjustments determined by the Plan Administrator shall be 
final, binding and conclusive.

                                       3
<PAGE>

                                   ARTICLE TWO

                       DISCRETIONARY OPTION GRANT PROGRAM

   I.     OPTION TERMS

          Each option shall be evidenced by one or more documents in the form
approved by the Plan Administrator; PROVIDED, however, that each such document
shall comply with the terms specified below.  Each document evidencing an
Incentive Option shall, in addition, be subject to the provisions of the Plan
applicable to such options.

          A.   EXERCISE PRICE.

               1.   The exercise price per share shall be fixed by the Plan
Administrator but shall not be less than one hundred percent (100%) of the Fair
Market Value per share of Common Stock on the option grant date. 

               2.   The exercise price shall become immediately due upon
exercise of the option and shall, subject to the provisions of Section I of
Article Three and the documents evidencing the option, be payable in one or more
of the forms specified below:

                 (i)     cash or check made payable to the Corporation,

                (ii)     shares of Common Stock held for the requisite
     period necessary to avoid a charge to the Corporation's earnings for
     financial reporting purposes and valued at Fair Market Value on the
     Exercise Date, or

               (iii)     through a special sale and remittance procedure
     pursuant to which the Optionee shall concurrently provide irrevocable
     instructions to (a) a Corporation-designated brokerage firm to effect
     the immediate sale of the purchased shares and remit to the
     Corporation, out of the sale proceeds available on the settlement
     date, sufficient funds to cover the aggregate exercise price payable
     for the purchased shares plus all applicable Federal, state and local
     income and employment taxes required to be withheld by the Corporation
     by reason of such exercise and (b) the Corporation to deliver the
     certificates for the purchased shares directly to such brokerage firm
     in order to complete the sale. 

          Except to the extent such sale and remittance procedure is utilized,
payment of the exercise price for the purchased shares must be made on the
Exercise Date.

                                       4
<PAGE>

          B.   EXERCISE AND TERM OF OPTIONS.  Each option shall be exercisable
at such time or times, during such period and for such number of shares as shall
be determined by the Plan Administrator and set forth in the documents
evidencing the option.  However, no option shall have a term in excess of ten
(10) years measured from the option grant date.  

          C.   EFFECT OF TERMINATION OF SERVICE.

               1.   The following provisions shall govern the exercise of any
options held by the Optionee at the time of cessation of Service or death:

                 (i)     Any option outstanding at the time of the
     Optionee's cessation of Service for any reason shall remain
     exercisable for such period of time thereafter as shall be determined
     by the Plan Administrator and set forth in the documents evidencing
     the option, but no such option shall be exercisable after the
     expiration of the option term.

                (ii)     Any option exercisable in whole or in part by the
     Optionee at the time of death may be subsequently exercised by the
     personal representative of the Optionee's estate or by the person or
     persons to whom the option is transferred pursuant to the Optionee's
     will or in accordance with the laws of descent and distribution.  

               (iii)     Should the Optionee's Service be terminated for
     Misconduct, then all outstanding options held by the Optionee shall
     terminate immediately and cease to be outstanding.

                (iv)     During the applicable post-Service exercise
     period, the option may not be exercised in the aggregate for more than
     the number of vested shares for which the option is exercisable on the
     date of the Optionee's cessation of Service.  Upon the expiration of
     the applicable exercise period or (if earlier) upon the expiration of
     the option term, the option shall terminate and cease to be
     outstanding for any otherwise exercisable shares for which the option
     has not been exercised.  However, the option shall, immediately upon
     the Optionee's cessation of Service, terminate and cease to be
     outstanding for any and all shares for the option is not otherwise at
     that time exercisable. 

               2.   The Plan Administrator shall have complete discretion,
exercisable either at the time an option is granted or at any time while the
option remains outstanding, to:

                                       5
<PAGE>

                 (i)     extend the period of time for which the option is
     to remain exercisable following the Optionee's cessation of Service
     from the limited exercise period otherwise in effect for that option
     to such greater period of time as the Plan Administrator shall deem
     appropriate, but in no event beyond the expiration of the option term,
     and/or

                (ii)     permit the option to be exercised, during the
     applicable post-Service exercise period, not only with respect to the
     number of vested shares of Common Stock for which such option is
     exercisable at the time of the Optionee's cessation of Service but
     also with respect to one or more additional installments for which the
     option would have become exercisable had the Optionee continued in
     Service.

          D.   STOCKHOLDER RIGHTS.  The holder of an option shall have no
stockholder rights with respect to the shares subject to the option until such
person shall have exercised the option, paid the exercise price and become the
record holder of the purchased shares.

          E.   LIMITED TRANSFERABILITY OF OPTIONS.  During the lifetime of the
Optionee, Incentive Options shall be exercisable only by the Optionee and shall
not be assignable or transferable other than by will or by the laws of descent
and distribution following the Optionee's death.  However, a Non-Statutory
Option may, in connection with the Optionee's estate plan, be assigned in whole
or in part during the Optionee's lifetime to one or more members of the
Optionee's immediate family or to a trust established exclusively for one or
more such family members.  The assigned portion may only be exercised by the
person or persons who acquire a proprietary interest in the option pursuant to
the assignment. The terms applicable to the assigned portion shall be the same
as those in effect for the option immediately prior to such assignment and shall
be set forth in such documents issued to the assignee as the Plan Administrator
may deem appropriate.

   II.    INCENTIVE OPTIONS

          The terms specified below shall be applicable to all Incentive
Options.  Except as modified by the provisions of this Section II, all the
provisions of Articles One, Two and Seven shall be applicable to Incentive
Options.  Options which are specifically designated as Non-Statutory Options
when issued under the Plan shall NOT be subject to the terms of this Section II.

          A.   ELIGIBILITY.  Incentive Options may only be granted to Employees.


          B.   DOLLAR LIMITATION.  The aggregate Fair Market Value of the shares
of Common Stock (determined as of the respective date or dates of grant) for
which one or more options granted to any Employee under the Plan (or any other
option plan of the Corporation or any Parent or Subsidiary) may for the first
time become exercisable as Incentive Options during 

                                       6
<PAGE>

any one calendar year shall not exceed the sum of One Hundred Thousand 
Dollars ($100,000).  To the extent the Employee holds two (2) or more such 
options which become exercisable for the first time in the same calendar 
year, the foregoing limitation on the exercisability of such options as 
Incentive Options shall be applied on the basis of the order in which such 
options are granted.

          C.   10% STOCKHOLDER.  If any Employee to whom an Incentive Option is
granted is a 10% Stockholder, then the exercise price per share shall not be
less than one hundred ten percent (110%) of the Fair Market Value per share of
Common Stock on the option grant date, and the option term shall not exceed five
(5) years measured from the option grant date.

 III.     CORPORATE TRANSACTION/CHANGE IN CONTROL

          A.   In the event of any Corporate Transaction, each outstanding
option shall automatically accelerate so that each such option shall,
immediately prior to the effective date of the Corporate Transaction, become
exercisable for the total number of shares of Common Stock at the time subject
to such option and may be exercised for any or all of those shares as fully
vested shares.  However, an outstanding option shall NOT become exercisable on
such an accelerated basis if and to the extent:  (i) such option is, in
connection with the Corporate Transaction, to be assumed by the successor
corporation (or parent thereof) or (ii) such option is to be replaced with a
cash incentive program of the successor corporation which preserves the spread
existing at the time of the Corporate Transaction on any shares for which the
option is not otherwise at that time exercisable and provides for subsequent
payout in accordance with the same exercise/vesting schedule applicable to those
option shares or (iii) the acceleration of such option is subject to other
limitations imposed by the Plan Administrator at the time of the option grant. 

          B.   Immediately following the consummation of the Corporate
Transaction, all outstanding options shall terminate and cease to be
outstanding, except to the extent assumed by the successor corporation (or
parent thereof).

          C.   Each option which is assumed in connection with a Corporate
Transaction shall be appropriately adjusted, immediately after such Corporate
Transaction, to apply to the number and class of securities which would have
been issuable to the Optionee in consummation of such Corporate Transaction had
the option been exercised immediately prior to such Corporate Transaction. 
Appropriate adjustments to reflect such Corporate Transaction shall also be made
to (i) the exercise price payable per share under each outstanding option,
PROVIDED the aggregate exercise price payable for such securities shall remain
the same, (ii) the maximum number and/or class of securities available for
issuance over the remaining term of the Plan and (iii) the maximum number and/or
class of securities for which any one person may be granted stock options under
the Plan per calendar year. 

                                       7
<PAGE>

          D.   The Plan Administrator shall have the discretionary authority to
provide for the automatic acceleration of one or more outstanding options upon
the occurrence of a Corporate Transaction, whether or not those options are to
be assumed in the Corporate Transaction, so that each such option shall,
immediately prior to the effect date of such Corporate Transaction, become fully
exercisable for the total number of shares at the time subject to that option
and may be exercised for any or all of those shares as fully vested shares. 

          E.   The Plan Administrator shall have full power and authority,
exercisable either at the time the option is granted or at any time while the
option remains outstanding, to provide for the automatic acceleration of one or
more outstanding options in the event the Optionee's Service is subsequently
terminated by reason of an Involuntary Termination within a designated period
(not to exceed eighteen (18) months) following the effective date of any
Corporate Transaction in which those options are assumed and do not otherwise
accelerate.  Any options so accelerated shall remain exercisable for fully
vested shares until the EARLIER of (i) the expiration of the option term or (ii)
the expiration of the one (1) year period measured from the effective date of
the Involuntary Termination.  

          F.   The Plan Administrator shall have the discretionary authority to
provide for the automatic acceleration of one or more outstanding options upon
the occurrence of a Change in Control so that each such option shall,
immediately prior to the effect date of such Change in Control, become fully
exercisable for the total number of shares at the time subject to that option
and may be exercised for any or all of those shares as fully vested shares. 
Alternatively, the Plan Administrator may condition the automatic acceleration
of one or more outstanding options upon the subsequent termination of the
Optionee's Service by reason of an Involuntary Termination within a designated
period (not to exceed eighteen (18) months) following the effective date of such
Change in Control.  Each option so accelerated shall remain exercisable for
fully vested shares until the EARLIER of (i) the expiration of the option term
or (ii) the expiration of the one (1) year period measured from the effective
date of Optionee's cessation of Service.  

          G.   The portion of any Incentive Option accelerated in connection
with a Corporate Transaction or Change in Control shall remain exercisable as an
Incentive Option only to the extent the applicable One Hundred Thousand Dollar
limitation is not exceeded.  To the extent such dollar limitation is exceeded,
the accelerated portion of such option shall be exercisable as a Non-Statutory
Option under the Federal tax laws.

          H.   The outstanding options shall in no way affect the right of the
Corporation to adjust, reclassify, reorganize or otherwise change its capital or
business structure or to merge, consolidate, dissolve, liquidate or sell or
transfer all or any part of its business or assets.

                                       8
<PAGE>

  IV.     CANCELLATION AND REGRANT OF OPTIONS

          The Plan Administrator shall have the authority to effect, at any time
and from time to time, with the consent of the affected option holders, the
cancellation of any or all outstanding options under the Discretionary Option
Grant Program and to grant in substitution new options covering the same or
different number of shares of Common Stock but with an exercise price per share
based on the Fair Market Value per share of Common Stock on the new grant date.

                                       9
<PAGE>

                                  ARTICLE THREE

                                  MISCELLANEOUS

   I.     INTENTIONALLY OMITTED

  II.     TAX WITHHOLDING 

          A.   The Corporation's obligation to deliver shares of Common Stock
upon the exercise of options under the Plan shall be subject to the satisfaction
of all applicable Federal, state and local income and employment tax withholding
requirements.

          B.   The Plan Administrator may, in its discretion, provide any or all
holders of Non-Statutory Options under the Plan with the right to use shares of
Common Stock in satisfaction of all or part of the Taxes incurred by such
holders in connection with the exercise of those options.  Such right may be
provided to any such holder in either or both of the following formats:

               STOCK WITHHOLDING:  The election to have the Corporation
withhold, from the shares of Common Stock otherwise issuable upon the exercise
of such Non-Statutory Option, a portion of those shares with an aggregate Fair
Market Value equal to the percentage of the Taxes (not to exceed one hundred
percent (100%)) designated by the holder.

               STOCK DELIVERY:  The election to deliver to the Corporation, at
the time the Non-Statutory Option is exercised, one or more shares of Common
Stock previously acquired by such holder (other than in connection with the
option exercise triggering the Taxes) with an aggregate Fair Market Value equal
to the percentage of the Taxes (not to exceed one hundred percent (100%))
designated by the holder.

 III.     EFFECTIVE DATE AND TERM OF THE PLAN

          A.   The Plan shall become effective immediately upon the Plan
Effective Date.  Options may be granted under the Discretionary Option Grant
Program at any time on or after the Plan Effective Date.  However, no options
granted under the Plan may be exercised, and no shares shall be issued under the
Plan, until the Plan is approved by the Corporation's 

                                       10
<PAGE>

stockholders.  If such stockholder approval is not obtained within twelve 
(12) months after the Plan Effective Date, then all options previously 
granted under this Plan shall terminate and cease to be outstanding, and no 
further options shall be granted and no shares shall be issued under the Plan.

          B.   The Plan shall terminate upon the EARLIEST of (i) October 31,
2007, (ii) the date on which all shares available for issuance under the Plan
shall have been issued as fully-vested shares or (iii) the termination of all
outstanding options in connection with a Corporate Transaction.  Should the Plan
terminate on October 31, 2007, then all option grants outstanding at that time
shall thereafter continue to have force and effect in accordance with the
provisions of the documents evidencing those grants.

  IV.     AMENDMENT OF THE PLAN 

          A.   The Board shall have complete and exclusive power and authority
to amend or modify the Plan in any or all respects.  However, no such amendment
or modification shall adversely affect the rights and obligations with respect
to stock options at the time outstanding under the Plan unless the Optionee
consents to such amendment or modification. In addition, certain amendments may
require stockholder approval pursuant to applicable laws or regulations. 

          B.   Options to purchase shares of Common Stock may be granted under
the Discretionary Option Grant Program which in excess of the number of shares
then available for issuance under the Plan, provided those options shall not
become exercisable for any of the excess shares unless and until there is
obtained stockholder approval of an amendment sufficiently increasing the number
of shares of Common Stock available for issuance under the Plan.  If such
stockholder approval is not obtained within twelve (12) months after the date
the first of such option grants is made, then all options with such excess
shares shall immediately terminate and cease to be exercisable with respect to
those excess shares. 

   V.     USE OF PROCEEDS

          Any cash proceeds received by the Corporation from the sale of shares
of Common Stock under the Plan shall be used for general corporate purposes.

  VI.     REGULATORY APPROVALS

          A.   The implementation of the Plan or the granting of any stock
option under the Plan upon the exercise of any granted option shall be subject
to the Corporation's procurement of all approvals and permits required by
regulatory authorities having jurisdiction over the Plan, the stock options
granted under it and the shares of Common Stock issued pursuant to it.

                                       11
<PAGE>

          B.   No shares of Common Stock or other assets shall be issued or
delivered under the Plan unless and until there shall have been compliance with
all applicable requirements of Federal and state securities laws, including the
filing and effectiveness of the Form S-8 registration statement for the shares
of Common Stock issuable under the Plan, and all applicable listing requirements
of any stock exchange (or the Nasdaq National Market, if applicable) on which
Common Stock is then listed for trading. 

 VII.     NO EMPLOYMENT/SERVICE RIGHTS

          Nothing in the Plan shall confer upon the Optionee any right to
continue in Service for any period of specific duration or interfere with or
otherwise restrict in any way the rights of the Corporation (or any Parent or
Subsidiary employing or retaining such person) or of the Optionee, which rights
are hereby expressly reserved by each, to terminate such person's Service at any
time for any reason, with or without cause.

                                       12
<PAGE>

                                    APPENDIX 


          The following definitions shall be in effect under the Plan:

     A.   BOARD shall mean the Corporation's Board of Directors.

     B.   CHANGE IN CONTROL shall mean a change in ownership or control of the
Corporation effected through either of the following transactions:

            (i)     the acquisition, directly or indirectly by any person
     or related group of persons (other than the Corporation or a person
     that directly or indirectly controls, is controlled by, or is under
     common control with, the Corporation), of beneficial ownership (within
     the meaning of Rule 13d-3 of the 1934 Act) of securities possessing
     more than fifty percent (50%) of the total combined voting power of
     the Corporation's outstanding securities pursuant to a tender or
     exchange offer made directly to the Corporation's stockholders, or

           (ii)     a change in the composition of the Board over a period
     of thirty-six (36) consecutive months or less such that a majority of
     the Board members ceases, by reason of one or more contested elections
     for Board membership, to be comprised of individuals who either (A)
     have been Board members continuously since the beginning of such
     period or (B) have been elected or nominated for election as Board
     members during such period by at least a majority of the Board members
     described in clause (A) who were still in office at the time the Board
     approved such election or nomination. 

     C.   CODE shall mean the Internal Revenue Code of 1986, as amended.

     D.   COMMON STOCK shall mean the Corporation's common stock.

     E.   CORPORATE TRANSACTION shall mean either of the following stockholder-
approved transactions to which the Corporation is a party:

            (i)     a merger or consolidation in which securities
     possessing more than fifty percent (50%) of the total combined voting
     power of the Corporation's outstanding securities are transferred to a
     person or persons different from the persons holding those securities
     immediately prior to such transaction, or 

           (ii)     the sale, transfer or other disposition of all or
     substantially all of the Corporation's assets  in complete liquidation
     or dissolution of the Corporation.

                                       A-1
<PAGE>

     F.   CORPORATION shall mean Spiros Development Corporation II, Inc., a
Delaware corporation, and its successors.

     G.   DISCRETIONARY OPTION GRANT PROGRAM shall mean the discretionary option
grant program in effect under the Plan.

     H.   EMPLOYEE shall mean an individual who is in the employ of the
Corporation (or any Parent or Subsidiary), subject to the control and direction
of the employer entity as to both the work to be performed and the manner and
method of performance.

     I.   EXERCISE DATE shall mean the date on which the Corporation shall have
received written notice of the option exercise.

     J.   FAIR MARKET VALUE per share of Common Stock on any relevant date shall
be determined in accordance with the following provisions:

            (i)     If the Common Stock is at the time traded on the Nasdaq
     National Market, then the Fair Market Value shall be deemed equal to
     the closing selling price per share of Common Stock on the date in
     question, as such price is reported on the Nasdaq National Market.  If
     there is no closing selling price for the Common Stock on the date in
     question, then the Fair Market Value shall be the closing selling
     price on the last preceding date for which such quotation exists.

           (ii)     If the Common Stock is at the time listed on any Stock
     Exchange, then the Fair Market Value shall be deemed equal to the
     closing selling price per share of Common Stock on the date in
     question on the Stock Exchange determined by the Plan Administrator to
     be the primary market for the Common Stock, as such price is
     officially quoted in the composite tape of transactions on such
     exchange.  If there is no closing selling price for the Common Stock
     on the date in question, then the Fair Market Value shall be the
     closing selling price on the last preceding date for which such
     quotation exists.

     K.   INCENTIVE OPTION shall mean an option which satisfies the requirements
of Code Section 422.

     L.   INVOLUNTARY TERMINATION shall mean the termination of the Service of
any individual which occurs by reason of: 

            (i)     such individual's involuntary dismissal or discharge by
     the Corporation for reasons other than Misconduct, or 

                                       A-2
<PAGE>

           (ii)     such individual's voluntary resignation following (A) a
     change in his or her position with the Corporation which materially
     reduces his or her duties and responsibilities or the level of
     management to which he or she reports, (B) a reduction in his or her
     level of compensation (including base salary, fringe benefits and
     target bonus under any performance based bonus or incentive programs)
     by more than fifteen percent (15%) or (C) a relocation of such
     individual's place of employment by more than fifty (50) miles,
     provided and only if such change, reduction or relocation is effected
     by the Corporation without the individual's consent.
     
     M.   MISCONDUCT shall mean the commission of any act of fraud, embezzlement
or dishonesty by the Optionee, any unauthorized use or disclosure by such person
of confidential information or trade secrets of the Corporation (or any Parent
or Subsidiary), or any other intentional misconduct by such person adversely
affecting the business or affairs of the Corporation (or any Parent or
Subsidiary) in a material manner.  The foregoing definition shall not be deemed
to be inclusive of all the acts or omissions which the Corporation (or any
Parent or Subsidiary) may consider as grounds for the dismissal or discharge of
any Optionee or other person in the Service of the Corporation (or any Parent or
Subsidiary). 

     N.   1934 ACT shall mean the Securities Exchange Act of 1934, as amended.

     O.   NON-STATUTORY OPTION shall mean an option not intended to satisfy  the
requirements of Code Section 422.

     P.   OPTIONEE shall mean any person to whom an option is granted under the
Discretionary Option Grant Program.

     Q.   PARENT shall mean any corporation (other than the Corporation) in an
unbroken chain of corporations ending with the Corporation, provided each
corporation in the unbroken chain (other than the Corporation) owns, at the time
of the determination, stock possessing fifty percent (50%) or more of the total
combined voting power of all classes of stock in one of the other corporations
in such chain.

     R.   PERMANENT DISABILITY OR PERMANENTLY DISABLED shall mean the inability
of the Optionee or the Participant to engage in any substantial gainful activity
by reason of any medically determinable physical or mental impairment expected
to result in death or to be of continuous duration of twelve (12) months or
more.  

     S.   PLAN shall mean the Corporation's 1997 Stock Option Plan, as set forth
in this document.

                                       A-3
<PAGE>

     T.   PLAN ADMINISTRATOR shall mean the particular entity, whether the
Primary Committee, the Board or the Secondary Committee, which is authorized to
administer the Discretionary Option Grant Program with respect to one or more
classes of eligible persons, to the extent such entity is carrying out its
administrative functions under the programs with respect to the persons under
its jurisdiction.

     U.   PLAN EFFECTIVE DATE shall mean the date on which the Common Stock is
first registered under Section 12 of the 1934 Act. 

     V.   PRIMARY COMMITTEE shall mean the committee of two (2) or more non-
employee Board members appointed by the Board to administer the Discretionary
Option Grant Program with respect to Section 16 Insiders.

     W.   SECONDARY COMMITTEE shall mean a committee of one (1) or more Board
members appointed by the Board to administer the Discretionary Option Grant
Program with respect to eligible persons other than Section 16 Insiders. 

     X.   SECTION 16 INSIDER shall mean an officer or director of the
Corporation subject to the short-swing profit liabilities of Section 16 of the
1934 Act.

     Y.   SERVICE shall mean the performance of services for the Corporation (or
any Parent or Subsidiary) by a person in the capacity of an Employee, a non-
employee member of the board of directors or a consultant or independent
advisor, except to the extent otherwise specifically provided in the documents
evidencing the option grant or stock issuance.

     Z.   STOCK EXCHANGE shall mean either the American Stock Exchange or the
New York Stock Exchange.

     AA.  SUBSIDIARY shall mean any corporation (other than the Corporation) in
an unbroken chain of corporations beginning with the Corporation, provided each
corporation (other than the last corporation) in the unbroken chain owns, at the
time of the determination, stock possessing fifty percent (50%) or more of the
total combined voting power of all classes of stock in one of the other
corporations in such chain.

     AB.  TAXES shall mean the Federal, state and local income and employment
tax liabilities incurred by the holder of Non-Statutory Options in connection
with the exercise of those options.

     AC.  10% STOCKHOLDER shall mean the owner of stock (as determined under
Code Section 424(d)) possessing more than ten percent (10%) of the total
combined voting power of all classes of stock of the Corporation (or any Parent
or Subsidiary).


                                       A-4


<PAGE>


           1997 Stock Option Plan Form of Notice of Grant of Stock Option.


<PAGE>


                   SPIROS DEVELOPMENT CORPORATION II, INC.
                       NOTICE OF GRANT OF STOCK OPTION


          Notice is hereby given of the following option grant (the "Option") to
purchase shares of the Common Stock of Spiros Development Corporation II, Inc.
(the "Corporation"):

          OPTIONEE:                                                             
                    ------------------------------------------------------------
          GRANT DATE:                                                           
                      ----------------------------------------------------------

          EXERCISE PRICE:  $                                           per share
                            ------------------------------------------
          NUMBER OF OPTION SHARES:                                        shares
                                   --------------------------------------
          EXPIRATION DATE:                                                      
                           -----------------------------------------------------
          TYPE OF OPTION:             Incentive Stock Option
                              -------
                                      Non-Statutory Stock Option 
                              -------

          EXERCISE SCHEDULE:  The Option shall become exercisable for all the
          Option Shares upon the Optionee's completion of five (5) years of
          Service measured from the Grant Date.  However, the Option shall
          become exercisable for all the Option Shares on an accelerated basis
          immediately prior to the occurrence of the following performance 
          milestone, provided such milestone event occurs during the Optionee's
          period of Service:  Dura Pharmaceuticals, Inc. ("Dura") shall 
          purchase all of the Corporation's outstanding Common Stock pursuant
          to the stock purchase option granted to Dura under the Corporation's
          Amended and Restated Certificate of Incorporation.  In no event shall
          the Option become exercisable for any Option Shares after Optionee's
          cessation of Service.

          Optionee understands and agrees that the Option is granted subject 
to and in accordance with the terms of the Spiros Development Corporation II, 
Inc. 1997 Stock Option Plan (the "Plan").  Optionee further agrees to be 
bound by the terms of the Plan and the terms of the Option as set forth in 
the attached Stock Option Agreement.  If this is Optionee's first stock 
option grant under the Plan, a copy of the prospectus for the Plan is also 
attached hereto.  A copy of the Plan is available upon request made to the 
Corporate Secretary at the Corporation's principal offices.

<PAGE>

          NO EMPLOYMENT OR SERVICE CONTRACT.  Nothing in this Notice or in the
attached Stock Option Agreement or in the Plan shall confer upon Optionee any
right to continue in Service for any period of specific duration or interfere
with or otherwise restrict in any way the rights of the Corporation (or any
Parent or Subsidiary employing or retaining Optionee) or of Optionee, which
rights are hereby expressly reserved by each, to terminate Optionee's Service at
any time for any reason, with or without cause.

          DEFINITIONS.  All capitalized terms in this Notice shall have the
meaning assigned to them in this Notice or in the attached Stock Option
Agreement.

DATED:                        , 199    
       -----------------------     --

                                      SPIROS DEVELOPMENT
                                      CORPORATION II, INC.

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

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


                                      ------------------------------------------
                                                       OPTIONEE

                                      Address:                                  
                                                --------------------------------
                                                                                
                                      ------------------------------------------






                                       2
<PAGE>












                                  EXHIBIT A

                            STOCK OPTION AGREEMENT



<PAGE>

                                          
               1997 Stock Option Plan Form of Stock Option Agreement.
                                          

<PAGE>

                     SPIROS DEVELOPMENT CORPORATION II, INC.
                             STOCK OPTION AGREEMENT

RECITALS

     A.   The Board has adopted the Plan for the purpose of retaining the 
services of selected Employees, non-employee members of the Board or of the 
board of directors of any Parent or Subsidiary and consultants and other 
independent advisors who provide services to the Corporation (or any Parent 
or Subsidiary).

     B.   Optionee is to render valuable services to the Corporation (or a 
Parent or Subsidiary), and this Agreement is executed pursuant to, and is 
intended to carry out the purposes of, the Plan in connection with the 
Corporation's grant of an option to Optionee.

     C.   All capitalized terms in this Agreement shall have the meaning 
assigned to them in the attached Appendix.

          NOW, THEREFORE, it is hereby agreed as follows:

          1.   GRANT OF OPTION.  The Corporation hereby grants to Optionee, 
as of the Grant Date, an option to purchase up to the number of Option Shares 
specified in the Grant Notice.  The Option Shares shall be purchasable from 
time to time during the option term specified in Paragraph 2 at the Exercise 
Price.

          2.   OPTION TERM.  This option shall have a maximum term of ten 
(10) years measured from the Grant Date and shall accordingly expire at the 
close of business on the Expiration Date, unless sooner terminated in 
accordance with Paragraph 5 or 6.

          3.   LIMITED TRANSFERABILITY.  This option shall be neither 
transferable nor assignable by Optionee other than by will or by the laws of 
descent and distribution following Optionee's death and may be exercised, 
during Optionee's lifetime, only by Optionee.  However, if this option is 
designated a Non-Statutory Option in the Grant Notice, then this option may, 
in connection with the Optionee's estate plan, be assigned in whole or in 
part during Optionee's lifetime to one or more members of the Optionee's 
immediate family or to a trust established for the exclusive benefit of one 
or more such family members.  The assigned portion shall be exercisable only 
by the person or persons who acquire a proprietary interest in the option 
pursuant to such assignment.  The terms applicable to the assigned portion 
shall be the same as those in effect for this option immediately prior to 
such assignment and shall be set forth in such documents issued to the 
assignee as the Plan Administrator may deem appropriate.

<PAGE>

          4.   DATES OF EXERCISE.  This option shall become exercisable for 
the Option Shares in one or more installments as specified in the Grant 
Notice.  As the option becomes exercisable for such installments, those 
installments shall accumulate, and the option shall remain exercisable for 
the accumulated installments until the Expiration Date or sooner termination 
of the option term under Paragraph 5 or 6.

          5.   CESSATION OF SERVICE.  The option term specified in Paragraph 
2 shall terminate (and this option shall cease to be outstanding) prior to 
the Expiration Date should any of the following provisions become applicable:

                      (i)     Should Optionee cease to remain in Service
     for any reason (other than death, Permanent Disability or Misconduct)
     while this option is outstanding, then the period during which this
     option may be exercised shall be limited to a three (3)-month period
     commencing with the date of such cessation of Service.  In no event,
     however, shall this option be exercisable at any time after the
     Expiration Date.

                     (ii)     Should Optionee dies while holding this
     option, then the personal representative of Optionee's estate or the
     person or persons to whom the option is transferred pursuant to
     Optionee's will or in accordance with the laws of descent and
     distribution shall have the right to exercise this option.  Such right
     shall lapse, and this option shall cease to be outstanding, upon the
     EARLIER of (A) the expiration of the twelve (12)-month period measured
     from the date of Optionee's death or (B) the Expiration Date.

                    (iii)     Should Optionee cease Service by reason of
     Permanent Disability while this option is outstanding, then the period
     during which this option may be exercised shall be limited to twelve
     (12)-month period commencing with the date of such cessation of
     Service.  In no event, however, shall this option be exercisable at
     any time after the Expiration Date.

                     (iv)     During the limited period of post-Service
     exercisability, this option may not be exercised in the aggregate for
     more than the number of Option Shares for which the option is
     exercisable at the time of Optionee's cessation of Service.  Upon the
     expiration of such limited exercise period or (if earlier) upon the
     Expiration Date, this option shall terminate and cease to be
     outstanding for any otherwise exercisable Option Shares for which the
     option has not been exercised.  However, this option shall,
     immediately upon Optionee's cessation of Service for any reason,
     terminate and cease to be outstanding with respect to any and all
     Option Shares for which this option is not otherwise at that time
     exercisable.

                                   2
<PAGE>


                      (v)     Should Optionee's Service be terminated for
     Misconduct, then this option shall terminate immediately and cease to
     remain outstanding.

          6.   SPECIAL ACCELERATION OF OPTION.

               (a)  In the event of a Corporate Transaction, this option, to 
the extent outstanding at that time, but not otherwise fully exercisable, 
shall automatically accelerate so that this option shall, immediately prior 
to the effective date of the Corporate Transaction, become exercisable for 
all of the Option Shares at the time subject to this option and may be 
exercised for any or all of those Option Shares as fully-vested shares of 
Common Stock.  However, this option shall not become exercisable on such an 
accelerated basis, if and to the extent: (i) this option is, in connection 
with the Corporate Transaction, to be assumed by the successor corporation 
(or parent thereof) or (ii) this option is to be replaced with a cash 
incentive program of the successor corporation which preserves the spread 
existing at the time of the Corporate Transaction on the Option Shares for 
which this option is not otherwise at that time exercisable (the excess of 
the Fair Market Value of those Option Shares over the aggregate Exercise 
Price payable for such shares) and provides for subsequent pay-out in 
accordance with the same option exercise/vesting schedule set forth in the 
Grant Notice.

               (b)  Immediately following the Corporate Transaction, this 
option shall terminate and cease to be outstanding, except to the extent 
assumed by the successor corporation (or parent thereof) in connection with 
the Corporate Transaction.

               (c)  If this option is assumed in connection with a Corporate 
Transaction, then this option shall be appropriately adjusted, immediately 
after such Corporate Transaction, to apply to the number and class of 
securities which would have been issuable to Optionee in consummation of such 
Corporate Transaction had the option been exercised immediately prior to such 
Corporate Transaction, and appropriate adjustments shall also be made to the 
Exercise Price, PROVIDED the aggregate Exercise Price shall remain the same.

               (d)  This option may also become exercisable on an accelerated 
basis in accordance with the terms and conditions of any special addendum 
attached to this Agreement.

               (e)  This Agreement shall not in any way affect the right of 
the Corporation to adjust, reclassify, reorganize or otherwise change its 
capital or business structure or to merge, consolidate, dissolve, liquidate 
or sell or transfer all or any part of its business or assets.

                                   3
<PAGE>

          7.   ADJUSTMENT IN OPTION SHARES.  Should any change be made to the 
Common Stock by reason of any stock split, stock dividend, recapitalization, 
combination of shares, exchange of shares or other change affecting the 
outstanding Common Stock as a class without the Corporation's receipt of 
consideration, appropriate adjustments shall be made to (i) the total number 
and/or class of securities subject to this option and (ii) the Exercise Price 
in order to reflect such change and thereby preclude a dilution or 
enlargement of benefits hereunder.

          8.   STOCKHOLDER RIGHTS.  The holder of this option shall not have 
any stockholder rights with respect to the Option Shares until such person 
shall have exercised the option, paid the Exercise Price and become a holder 
of record of the purchased shares.

          9.   MANNER OF EXERCISING OPTION.

               (a)  In order to exercise this option with respect to all or 
any part of the Option Shares for which this option is at the time 
exercisable, Optionee (or any other person or persons exercising the option) 
must take the following actions:

                      (i)     Execute and deliver to the Corporation a
     Notice of Exercise for the Option Shares for which the option is
     exercised.

                     (ii)     Pay the aggregate Exercise Price for the
     purchased shares in one or more of the following forms:

                         (A)  cash or check made payable to the
          Corporation;

                         (B)  a promissory note payable to the Corporation,
          but only to the extent authorized by the Plan Administrator in
          accordance with Paragraph 13;

                         (C)  shares of Common Stock held by Optionee (or
          any other person or persons exercising the option) for the
          requisite period necessary to avoid a charge to the Corporation's
          earnings for financial reporting purposes and valued at Fair
          Market Value on the Exercise Date; or

                         (D)  through a special sale and remittance
          procedure pursuant to which Optionee (or any other person or
          persons exercising the option) shall concurrently provide
          irrevocable written instructions (I) to a Corporation-designated
          brokerage firm to effect the immediate sale of the purchased
          shares and remit to the Corporation, out of the sale proceeds
          available on the settlement date, sufficient funds to


                                   4
<PAGE>

          cover the aggregate Exercise Price payable for the purchased 
          shares plus all applicable Federal, state and local income and 
          employment taxes required to be withheld by the Corporation by 
          reason of such exercise and (II) to the Corporation to deliver the
          certificates for the purchased shares directly to such brokerage
          firm in order to complete the sale.

               Except to the extent the sale and remittance procedure is
          utilized in connection with the option exercise, payment of the
          Exercise Price must accompany the Notice of Exercise delivered to
          the Corporation in connection with the option exercise.

                    (iii)     Furnish to the Corporation appropriate
     documentation that the person or persons exercising the option (if
     other than Optionee) have the right to exercise this option.

                     (iv)     Make appropriate arrangements with the
     Corporation (or Parent or Subsidiary employing or retaining Optionee)
     for the satisfaction of all Federal, state and local income and
     employment tax withholding requirements applicable to the option
     exercise.

               (b)  As soon as practical after the Exercise Date, the 
Corporation shall issue to or on behalf of Optionee (or any other person or 
persons exercising this option) a certificate for the purchased Option 
Shares, with the appropriate legends affixed thereto.

               (c)  In no event may this option be exercised for any 
fractional shares.

          10.  COMPLIANCE WITH LAWS AND REGULATIONS.

               (a)  The exercise of this option and the issuance of the 
Option Shares upon such exercise shall be subject to compliance by the 
Corporation and Optionee with all applicable requirements of law relating 
thereto and with all applicable regulations of any stock exchange (or the 
Nasdaq National Market, if applicable) on which the Common Stock may be 
listed for trading at the time of such exercise and issuance.

               (b)  The inability of the Corporation to obtain approval from 
any regulatory body having authority deemed by the Corporation to be 
necessary to the lawful issuance and sale of any Common Stock pursuant to 
this option shall relieve the Corporation of any liability with respect to 
the non-issuance or sale of the Common Stock as to which such approval shall 
not have been obtained. The Corporation, however, shall use its best efforts 
to obtain all such approvals.

                                   5
<PAGE>

          11.  SUCCESSORS AND ASSIGNS.  Except to the extent otherwise 
provided in Paragraphs 3 and 6, the provisions of this Agreement shall inure 
to the benefit of, and be binding upon, the Corporation and its successors 
and assigns and Optionee, Optionee's assigns and the legal representatives, 
heirs and legatees of Optionee's estate.

          12.  NOTICES.  Any notice required to be given or delivered to the 
Corporation under the terms of this Agreement shall be in writing and 
addressed to the Corporation at its principal corporate offices.  Any notice 
required to be given or delivered to Optionee shall be in writing and 
addressed to Optionee at the address indicated below Optionee's signature 
line on the Grant Notice. All notices shall be deemed effective upon personal 
delivery or upon deposit in the U.S. mail, postage prepaid and properly 
addressed to the party to be notified.

          13.  FINANCING.  The Plan Administrator may, in its absolute 
discretion and without any obligation to do so, permit Optionee to pay the 
Exercise Price for the purchased Option Shares by delivering a full-recourse 
promissory note payable to the Corporation.  The terms of any such promissory 
note (including the interest rate, the requirements for collateral and the 
terms of repayment) shall be established by the Plan Administrator in its 
sole discretion.

          14.  CONSTRUCTION.  This Agreement and the option evidenced hereby 
are made and granted pursuant to the Plan and are in all respects limited by 
and subject to the terms of the Plan.  All decisions of the Plan 
Administrator with respect to any question or issue arising under the Plan or 
this Agreement shall be conclusive and binding on all persons having an 
interest in this option.

          15.  GOVERNING LAW.  The interpretation, performance and 
enforcement of this Agreement shall be governed by the laws of the State of 
California without resort to that State's conflict-of-laws rules.

          16.  EXCESS SHARES.  If the Option Shares covered by this Agreement 
exceed, as of the Grant Date, the number of shares of Common Stock which may 
without stockholder approval be issued under the Plan, then this option shall 
be void with respect to those excess shares, unless stockholder approval of 
an amendment sufficiently increasing the number of shares of Common Stock 
issuable under the Plan is obtained in accordance with the provisions of the 
Plan.

          17.  ADDITIONAL TERMS APPLICABLE TO AN INCENTIVE OPTION.  In the 
event this option is designated an Incentive Option in the Grant Notice, the 
following terms and conditions shall also apply to the grant:

                      (i)     This option shall cease to qualify for
     favorable tax treatment as an Incentive Option if (and to the extent)
     this option is exercised for one or more Option Shares: (A) more than
     three (3) months after the date 

                                   6
<PAGE>


     Optionee ceases to be an Employee for any reason other than death or 
     Permanent Disability or (B) more than twelve (12) months after the date 
     Optionee ceases to be an Employee by reason of Permanent Disability.

                     (ii)     No installment under this option shall
     qualify for favorable tax treatment as an Incentive Option if (and to
     the extent) the aggregate Fair Market Value (determined at the Grant
     Date) of the Common Stock for which such installment first becomes
     exercisable hereunder would, when added to the aggregate value
     (determined as of the respective date or dates of grant) of the Common
     Stock or other securities for which this option or any other Incentive
     Options granted to Optionee prior to the Grant Date (whether under the
     Plan or any other option plan of the Corporation or any Parent or
     Subsidiary) first become exercisable during the same calendar year,
     exceed One Hundred Thousand Dollars ($100,000) in the aggregate. 
     Should such One Hundred Thousand Dollar ($100,000) limitation be
     exceeded in any calendar year, this option shall nevertheless become
     exercisable for the excess shares in such calendar year as a Non-
     Statutory Option.

                    (iii)     Should the exercisability of this option be
     accelerated upon a Corporate Transaction, then this option shall
     qualify for favorable tax treatment as an Incentive Option only to the
     extent the aggregate Fair Market Value (determined at the Grant Date)
     of the Common Stock for which this option first becomes exercisable in
     the calendar year in which the Corporate Transaction occurs does not,
     when added to the aggregate value (determined as of the respective
     date or dates of grant) of the Common Stock or other securities for
     which this option or one or more other Incentive Options granted to
     Optionee prior to the Grant Date (whether under the Plan or any other
     option plan of the Corporation or any Parent or Subsidiary) first
     become exercisable during the same calendar year, exceed One Hundred
     Thousand Dollars ($100,000) in the aggregate.  Should the applicable
     One Hundred Thousand Dollar ($100,000) limitation be exceeded in the
     calendar year of such Corporate Transaction, the option may
     nevertheless be exercised for the excess shares in such calendar year
     as a Non-Statutory Option.

                     (iv)     Should Optionee hold, in addition to this
     option, one or more other options to purchase Common Stock which
     become exercisable for the first time in the same calendar year as
     this option, then the foregoing limitations on the exercisability of
     such options as Incentive Options shall be applied on the basis of the
     order in which such options are granted.

          18.  LEAVE OF ABSENCE.  The following provisions shall apply upon 
the Optionee's commencement of an authorized leave of absence:

                                   7
<PAGE>


                      (i)     The exercise schedule in effect under the
     Grant Notice shall be frozen as of the first day of the authorized
     leave, and this option shall not become exercisable for any additional
     installments of the Option Shares during the period Optionee remains
     on such leave.

                     (ii)     Should Optionee resume active Employee status
     within sixty (60) days after the start date of the authorized leave,
     Optionee shall, for purposes of the exercise schedule set forth in the
     Grant Notice, receive Service credit for the entire period of such
     leave.  If Optionee does not resume active Employee status within such
     sixty (60)-day period, then no Service credit shall be given for the
     period of such leave.

                    (iii)     If the option is designated as an Incentive
     Option in the Grant Notice, then the following additional provision
     shall apply:

                         -    If the leave of absence continues for more
          than ninety (90) days, then this option shall automatically
          convert to a Non-Statutory Option under the Federal tax laws at
          the end of the three (3)-month period measured from the ninety-
          first (91st) day of such leave, unless the Optionee's
          reemployment rights are guaranteed by statute or by written
          agreement.  Following any such conversion of the option, all
          subsequent exercises of such option, whether effected before or
          after Optionee's return to active Employee status, shall result
          in an immediate taxable event, and the Corporation shall be
          required to collect from Optionee the Federal, state and local
          income and employment withholding taxes applicable to such
          exercise.

                     (iv)     In no event shall this option become
     exercisable for any additional Option Shares or otherwise remain
     outstanding if Optionee does not resume Employee status prior to the
     Expiration Date of the option term. 


                                   8
<PAGE>


                                    EXHIBIT I
                               NOTICE OF EXERCISE


          I hereby notify Spiros Development Corporation II, Inc. (the 
"Corporation") that I elect to purchase____________ shares of the 
Corporation's Common Stock (the "Purchased Shares") at the option exercise 
price of $_____________ per share (the "Exercise Price") pursuant to that 
certain option (the "Option") granted to me under the Corporation's 1997 
Stock Incentive Plan on________________________, 199_.

          Concurrently with the delivery of this Exercise Notice to the 
Corporation, I shall hereby pay to the Corporation the Exercise Price for the 
Purchased Shares in accordance with the provisions of my agreement with the 
Corporation (or other documents) evidencing the Option and shall deliver 
whatever additional documents may be required by such agreement as a 
condition for exercise.  Alternatively, I may utilize the special 
broker-dealer sale and remittance procedure specified in my agreement to 
effect payment of the Exercise Price.

                    , 199  
- --------------------     --
Date

                              --------------------------------------------
                              Optionee

                              Address:                                    
                                      ------------------------------------


                              --------------------------------------------
Print name in exact manner
it is to appear on the
stock certificate: 
                              --------------------------------------------

Address to which certificate
is to be sent, if different
from address above:
                              --------------------------------------------


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

Social Security Number: 
                              --------------------------------------------

Employee Number:
                              --------------------------------------------

<PAGE>

                                    APPENDIX

          The following definitions shall be in effect under the Agreement:

     A.   AGREEMENT shall mean this Stock Option Agreement.

     B.   BOARD shall mean the Corporation's Board of Directors.

     C.   CODE shall mean the Internal Revenue Code of 1986, as amended.

     D.   COMMON STOCK shall mean the Corporation's common stock.

     E.   CORPORATE TRANSACTION shall mean either of the following stockholder-
approved transactions to which the Corporation is a party:

       (i)     a merger or consolidation in which securities possessing
     more than fifty percent (50%) of the total combined voting power of
     the Corporation's outstanding securities are transferred to a person
     or persons different from the persons holding those securities
     immediately prior to such transaction, or

      (ii)     the sale, transfer or other disposition of all or
     substantially all of the Corporation's assets in complete liquidation
     or dissolution of the Corporation.

     F.   CORPORATION shall mean Spiros Development Corporation II, Inc., a 
Delaware corporation.

     G.   EMPLOYEE shall mean an individual who is in the employ of the 
Corporation (or any Parent or Subsidiary), subject to the control and 
direction of the employer entity as to both the work to be performed and the 
manner and method of performance.

     H.   EXERCISE DATE shall mean the date on which the option shall have 
been exercised in accordance with Paragraph 9 of the Agreement.

     I.   EXERCISE PRICE shall mean the exercise price per share as specified 
in the Grant Notice.

     J.   EXPIRATION DATE shall mean the date on which the option expires as 
specified in the Grant Notice.


                                   A-1

<PAGE>

     K.   FAIR MARKET VALUE per share of Common Stock on any relevant date 
shall be determined in accordance with the following provisions:

       (i)     If the Common Stock is at the time traded on the Nasdaq
     National Market, then the Fair Market Value shall be the closing
     selling price per share of Common Stock on the date in question, as
     the price is reported by the National Association of Securities
     Dealers on the Nasdaq National Market or any successor system.  If
     there is no closing selling price for the Common Stock on the date in
     question, then the Fair Market Value shall be the closing selling
     price on the last preceding date for which such quotation exists.

      (ii)     If the Common Stock is at the time listed on any Stock
     Exchange, then the Fair Market Value shall be the closing selling
     price per share of Common Stock on the date in question on the Stock
     Exchange determined by the Plan Administrator to be the primary market
     for the Common Stock, as such price is officially quoted in the
     composite tape of transactions on such exchange.  If there is no
     closing selling price for the Common Stock on the date in question,
     then the Fair Market Value shall be the closing selling price on the
     last preceding date for which such quotation exists.

     L.   GRANT DATE shall mean the date of grant of the option as specified 
in the Grant Notice.

     M.   GRANT NOTICE shall mean the Notice of Grant of Stock Option 
accompanying the Agreement, pursuant to which Optionee has been informed of 
the basic terms of the option evidenced hereby.

     N.   INCENTIVE OPTION shall mean an option which satisfies the 
requirements of Code Section 422.

     O.   MISCONDUCT shall mean the commission of any act of fraud, 
embezzlement or dishonesty by Optionee, any unauthorized use or disclosure by 
Optionee of confidential information or trade secrets of the Corporation (or 
any Parent or Subsidiary), or any other intentional misconduct by Optionee 
adversely affecting the business or affairs of the Corporation (or any Parent 
or Subsidiary) in a material manner.  The foregoing definition shall not be 
deemed to be inclusive of all the acts or omissions which the Corporation (or 
any Parent or Subsidiary) may consider as grounds for the dismissal or 
discharge of Optionee or any other individual in the Service of the 
Corporation (or any Parent or Subsidiary).

     P.   NON-STATUTORY OPTION shall mean an option not intended to satisfy 
the requirements of Code Section 422.

     Q.   NOTICE OF EXERCISE shall mean the notice of exercise in the form 
attached hereto as Exhibit I.


                                    A-2
<PAGE>

     R.   OPTION SHARES shall mean the number of shares of Common Stock 
subject to the option as specified in the Grant Notice.

     S.   OPTIONEE shall mean the person to whom the option is granted as 
specified in the Grant Notice.

     T.   PARENT shall mean any corporation (other than the Corporation) in 
an unbroken chain of corporations ending with the Corporation, provided each 
corporation in the unbroken chain (other than the Corporation) owns, at the 
time of the determination, stock possessing fifty percent (50%) or more of 
the total combined voting power of all classes of stock in one of the other 
corporations in such chain.

     U.   PERMANENT DISABILITY shall mean the inability of Optionee to engage 
in any substantial gainful activity by reason of any medically determinable 
physical or mental impairment which is expected to result in death or has 
lasted or can be expected to last for a continuous period of twelve (12) 
months or more.

     V.   PLAN shall mean the Corporation's 1997 Stock Incentive Plan.

     W.   PLAN ADMINISTRATOR shall mean either the Board or a committee of 
the Board acting in its administrative capacity under the Plan. 

     X.   SERVICE shall mean the Optionee's performance of services for the 
Corporation (or any Parent or Subsidiary) in the capacity of an Employee, a 
non-employee member of the board of directors or a consultant or independent 
advisor.

     Y.   STOCK EXCHANGE shall mean the American Stock Exchange or the New 
York Stock Exchange.

     Z.   SUBSIDIARY shall mean any corporation (other than the Corporation) 
in an unbroken chain of corporations beginning with the Corporation, provided 
each corporation (other than the last corporation) in the unbroken chain 
owns, at the time of the determination, stock possessing fifty percent (50%) 
or more of the total combined voting power of all classes of stock in one of 
the other corporations in such chain.


                                    A-3




<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
COMPANY'S BALANCE SHEET AS OF DECEMBER 31, 1997, AND THE RELATED STATEMENT OF
OPERATIONS FOR THE PERIOD FROM SEPTEMBER 23, 1997 (DATE OF INCORPORATION) TO
DECEMBER 31, 1997 AND THE NOTES THERETO, AND IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO SUCH FINANCIAL STATEMENTS AND NOTES.
</LEGEND>
<MULTIPLIER> 1000
       
<S>                             <C>
<PERIOD-TYPE>                   OTHER
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             SEP-23-1997
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