SONUS PHARMACEUTICALS INC
10-Q, 1998-11-10
IN VITRO & IN VIVO DIAGNOSTIC SUBSTANCES
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<PAGE>   1

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

                     U.S. SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON D.C. 20549

                                    FORM 10-Q

[X]     QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES
        EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED SEPTEMBER 30, 1998

                                       or

[ ]     TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES
        EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM ______________ TO
        ____________.

                         Commission file number 0-26866

                           SONUS PHARMACEUTICALS, INC.
             (Exact Name of Registrant as Specified in Its Charter)

          DELAWARE                                      95-4343413
(State or Other Jurisdiction of          (I.R.S. Employer Identification Number)
 Incorporation or Organization)

                  22026 20TH AVE. SE, BOTHELL, WASHINGTON 98021
                    (Address of Principal Executive Offices)

                                 (425) 487-9500
              (Registrant's Telephone Number, Including Area Code)


Indicate by check whether the issuer (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

State the number of shares outstanding of each of the issuer's classes of common
equity as of the latest practicable date.


<TABLE>
<CAPTION>
                 Class                           Outstanding at October 31, 1998
                 -----                           -------------------------------
<S>                                              <C>
      Common Stock, $.001 par value                      8,629,742
</TABLE>


                               Page 1 of 12 Pages
                        Exhibit Index appears on Page 10


================================================================================
<PAGE>   2

                           SONUS PHARMACEUTICALS, INC.
                               INDEX TO FORM 10-Q


<TABLE>
<CAPTION>
                                                                                                             Page Number
                                                                                                             -----------
<S>                                                                                                          <C>
PART I.  FINANCIAL INFORMATION

         Item 1.  Financial Statements

                  Balance Sheets as of September 30, 1998 (unaudited) and December 31, 1997 ...........           3

                  Statements of Operations (unaudited) for the three months and nine months
                       ended September 30, 1998 and September 30, 1997 ................................           4

                  Statements of Cash Flow (unaudited) for the nine months ended
                      September 30, 1998 and September 30, 1997 .......................................           5

                  Notes to Financial Statements .......................................................           6

         Item 2.  Management's Discussion and Analysis of Financial Condition and
                      Results of Operations ...........................................................           7

PART II.  OTHER INFORMATION

         Item 1.  Legal Proceedings ...................................................................          10

         Item 6.  Exhibits and Reports on Form 8-K ....................................................          10

         Items 2, 3, 4 and 5 are not applicable and therefore have been omitted

SIGNATURES ............................................................................................          11
</TABLE>



                                       2
<PAGE>   3

PART I.  FINANCIAL INFORMATION

ITEM 1.  FINANCIAL STATEMENTS

                           SONUS PHARMACEUTICALS, INC.
                                 BALANCE SHEETS

<TABLE>
<CAPTION>
                                                                            SEPTEMBER 30,          DECEMBER 31,
                                                                                1998                  1997
                                                                            ------------           ------------
                                                                            (UNAUDITED)
<S>                                                                         <C>                    <C>         
ASSETS
Current assets:
   Cash and cash equivalents .....................................          $  6,625,401           $  5,253,227
   Marketable securities .........................................            13,690,045             21,317,835
   Other current assets ..........................................               331,111                639,970
                                                                            ------------           ------------
      Total current assets .......................................            20,646,557             27,211,032

Equipment, furniture and leasehold improvements, net of
   accumulated depreciation of $2,353,724 and $1,738,269 .........             1,520,086              1,734,737
                                                                            ------------           ------------
Total assets .....................................................          $ 22,166,643           $ 28,945,769
                                                                            ============           ============

LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
   Bank line of credit ...........................................          $  5,000,000           $  5,000,000
   Accounts payable and accrued expenses .........................             3,166,355              2,612,065
   Accrued clinical trial expenses ...............................             1,615,837              1,743,208
   Current portion of capital lease obligations ..................                85,184                146,762
                                                                            ------------           ------------
      Total current liabilities ..................................             9,867,376              9,502,035

Long-term debt ...................................................             2,019,741                845,939
Capital lease obligations, less current portion ..................                31,013                 93,178
Commitments
Stockholders' equity:
   Preferred stock; $.001 par value;
      5,000,000 authorized; no shares issued or outstanding ......                    --                     --
    Common stock; $.001 par value;
      20,000,000 shares authorized; 8,629,607 and 8,611,376
      shares issued and outstanding in 1998 and 1997,
      respectively ...............................................            34,995,061             34,860,237
   Accumulated deficit ...........................................           (24,742,381)           (16,338,949)
   Deferred compensation .........................................                (4,167)               (16,671)
                                                                            ------------           ------------
      Total stockholders' equity .................................            10,248,513             18,504,617
                                                                            ------------           ------------
Total liabilities and stockholders' equity .......................          $ 22,166,643           $ 28,945,769
                                                                            ============           ============
</TABLE>



                             See accompanying notes.



                                       3
<PAGE>   4

                           SONUS PHARMACEUTICALS, INC.
                            STATEMENTS OF OPERATIONS
                                   (UNAUDITED)



<TABLE>
<CAPTION>
                                            THREE MONTHS ENDED SEPTEMBER 30,               NINE MONTHS ENDED SEPTEMBER 30,
                                           -----------------------------------           -----------------------------------
                                               1998                   1997                  1998                    1997
                                           ------------           ------------           ------------           ------------
<S>                                        <C>                    <C>                    <C>                    <C>         
Revenues:
     Collaborative agreements ......       $  2,700,000           $  4,700,000           $  5,100,000           $ 14,500,000

Operating expenses:
     Research and development ......          2,988,347              3,921,921              8,709,665              9,415,246
     General and administrative ....          1,922,184              2,162,093              5,401,714              4,976,441
                                           ------------           ------------           ------------           ------------
Total operating expenses ...........          4,910,531              6,084,014             14,111,379             14,391,687
                                           ------------           ------------           ------------           ------------

Operating income (loss) ............         (2,210,531)            (1,384,014)            (9,011,379)               108,313

Other income (expense):
     Interest income ...............            231,118                294,550                776,706                815,551
     Interest expense ..............            (69,235)               (32,712)              (178,803)               (94,260)
                                           ------------           ------------           ------------           ------------
Income (loss) before income taxes ..         (2,048,648)            (1,122,176)            (8,413,476)               829,604

Income taxes .......................                 --                     --                     --                190,000
                                           ------------           ------------           ------------           ------------
Net income (loss) ..................       $ (2,048,648)          $ (1,122,176)          $ (8,413,476)          $    639,604
                                           ============           ============           ============           ============

Net income (loss) per share:
     Basic .........................       $      (0.24)          $      (0.13)          $      (0.98)          $       0.07
     Diluted .......................       $      (0.24)          $      (0.13)          $      (0.98)          $       0.07

Shares used in computation of net
  income (loss) per share:
     Basic .........................          8,626,253              8,573,029              8,619,125              8,553,321
     Diluted .......................          8,626,253              8,573,029              8,619,125              9,557,171
</TABLE>



                             See accompanying notes.



                                       4
<PAGE>   5

                           SONUS PHARMACEUTICALS, INC.
                            STATEMENTS OF CASH FLOWS
                                   (UNAUDITED)



<TABLE>
<CAPTION>
                                                                              NINE MONTHS ENDED SEPTEMBER 30,
                                                                            -----------------------------------
                                                                               1998                   1997
                                                                            ------------           ------------
<S>                                                                         <C>                    <C>         
OPERATING ACTIVITIES:
Net income (loss) ................................................          $ (8,413,476)          $    639,604
Adjustments to reconcile net income (loss) to net cash provided
   by (used in) operating activities:
   Depreciation and amortization .................................               627,959                443,367
   Amortization of discount on marketable securities .............                  (123)               (35,058)
   Realized (gain) loss on marketable securities .................                (7,881)                28,154
   Changes in operating assets and liabilities:
      Other current assets .......................................               308,859                 96,226
      Accounts payable and accrued expenses ......................               554,290                755,828
      Accrued clinical trial expenses ............................              (127,371)               403,033
      Deferred revenue ...........................................                    --             (1,000,000)
                                                                            ------------           ------------
Net cash provided by (used in) operating activities ..............            (7,057,743)             1,331,154

INVESTING ACTIVITIES:
Purchases of equipment, furniture and leasehold improvements .....              (400,803)              (865,499)
Purchases of marketable securities ...............................           (23,419,722)           (27,731,702)
Proceeds from sale of marketable securities ......................            17,772,969             15,797,079
Proceeds from maturities of marketable securities ................            13,292,590             11,243,205
                                                                            ------------           ------------
Net cash provided by (used in) investing activities ..............             7,245,034             (1,556,917)

FINANCING ACTIVITIES:
Proceeds from bank line of credit ................................            15,000,000             15,000,000
Repayment of bank line of credit .................................           (15,000,000)           (15,000,000)
Proceeds from long-term debt .....................................             1,173,802                     --
Repayment of capitalized lease obligations .......................              (123,743)              (146,490)
Proceeds from issuance of common stock and warrants ..............               134,824                389,989
                                                                            ------------           ------------
Net cash provided by financing activities ........................             1,184,883                243,499
                                                                            ------------           ------------

Change in cash and cash equivalents for the period ...............             1,372,174                 17,736
Cash and cash equivalents at beginning of period .................             5,253,227              7,236,615
                                                                            ------------           ------------
Cash and cash equivalents at end of period .......................          $  6,625,401           $  7,254,351
                                                                            ============           ============

Supplemental cash flow information:
   Interest paid .................................................          $     55,105           $     87,928
   Income taxes paid .............................................          $      7,500           $    105,272
</TABLE>



                             See accompanying notes.



                                       5
<PAGE>   6

                           SONUS PHARMACEUTICALS, INC.
                          NOTES TO FINANCIAL STATEMENTS
                                   (UNAUDITED)

1.   BASIS OF PRESENTATION

     The unaudited financial statements have been prepared in accordance with
generally accepted accounting principles for interim financial information and
with the instructions to Form 10-Q. Accordingly, they do not include all of the
information and footnotes required to be presented for complete financial
statements. The accompanying financial statements reflect all adjustments
(consisting only of normal recurring items) which are, in the opinion of
management, necessary for a fair presentation of the results for the interim
periods presented.

     The financial statements and related disclosures have been prepared with
the assumption that users of the interim financial information have read or have
access to the audited financial statements for the preceding fiscal year.
Accordingly, these financial statements should be read in conjunction with the
audited financial statements and the related notes thereto included in the Form
10-K for the year ended December 31, 1997 and filed with the SEC on March 31,
1998.

2.   RECENT ACCOUNTING PRONOUNCEMENTS

     In 1997, SONUS (the "Company") adopted Statement of Financial Accounting
Standards No. 128, "Earnings Per Share ("EPS")" (SFAS 128). In accordance with
this statement, the Company has presented both basic and diluted EPS. Basic EPS
is based on the weighted average number of common shares outstanding. Diluted
EPS is based on the weighted average number of common shares and dilutive
potential common shares. Dilutive potential common shares are calculated under
the treasury stock method and consist of unexercised stock options and warrants.
Amounts previously reported have been restated to conform to the provisions of
SFAS 128.

     During 1997, the Financial Accounting Standards Board issued Statement of
Financial Accounting Standard No. 130, "Reporting Comprehensive Income" (SFAS
130). SFAS 130 requires unrealized gains or losses on the Company's
available-for-sale securities, which are currently reported in shareholders'
equity, to be included in other comprehensive income. SFAS 130 is effective for
financial statements for fiscal years beginning after December 15, 1997 and all
interim periods thereafter. The total of other comprehensive income for the
periods ended September 30, 1998 and 1997 is immaterial.

     During 1997, the Financial Accounting Standards Board issued Statement of
Financial Accounting Standard No. 131, "Disclosures about Segments of an
Enterprise and Related Information" (SFAS 131). SFAS 131 is effective for
financial statements for fiscal years beginning after December 15, 1997. The
adoption of SFAS No. 131 is not expected to have a material impact on the
Company's results of operations, financial position or disclosures.



                                       6
<PAGE>   7

ITEM 2.  MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND
         RESULTS OF OPERATIONS

OVERVIEW

     SONUS (the "Company") is primarily engaged in the research, development and
commercialization of proprietary contrast agents for use in ultrasound imaging
and of proprietary drug delivery systems. The Company has financed its research
and development and clinical trials through payments received under agreements
with its collaborative partners, private equity and debt financings, and an
initial public offering ("IPO") completed in October 1995. Clinical trials of
the Company's principal product under development, EchoGen(R) (perflenapent
injectable emulsion), began in January 1994. In 1996, the Company filed a New
Drug Application ("NDA") with the U.S. Food and Drug Administration ("FDA") for
EchoGen as well as a Marketing Authorization Application ("MAA") with the
European Medicines Evaluation Agency ("EMEA").

     In February 1998, the Company received an action letter from the FDA which
indicated that the review of the EchoGen NDA was completed and the application
was considered inadequate for approval, citing certain deficiencies in the
application. In August 1998, the Company submitted to the FDA an amendment of
the NDA to address the deficiencies related to the echocardiography indications.
In October 1998, the Company submitted additional information requested by the
FDA relative to the echocardiography indication and the Company has received
notice from the FDA that the amendment filing was considered complete as of
October 19, 1998. Under the Food and Drug Administration Modernization Act, the
FDA has up to 180 days to review the amendment. Once the FDA review is complete,
the Company expects that the agency will issue another action letter. The
Company has not yet responded to issues raised in the February 1998 letter
relating to radiology indications but expects to submit additional clinical data
supportive of radiology indications at a later date.
 
     In March 1998, the EMEA's Committee for Proprietary Medicinal Products
("CPMP") issued a positive opinion on EchoGen for use as a transpulmonary
echocardiographic contrast agent in patients with suspected or established
cardiovascular disease who have had previous inconclusive non-contrast studies.
On July 20, 1998, the EMEA ratified the CPMP recommendation and granted a
marketing authorization for EchoGen in the 15 countries of the European Union
("E.U."). The Company and its marketing partner, Abbott Laboratories ("Abbott"),
are preparing for the commercialization of EchoGen in the E.U. after necessary
pricing approvals, reimbursement and manufacturing activities are completed.

     In May 1996, the Company formed a strategic alliance with Abbott for
marketing and selling of ultrasound contrast agents, including EchoGen, in the
U.S. Under the agreement, Abbott agreed to make certain payments to the Company,
primarily conditioned upon the achievement of milestones, of which $23.0 million
has been paid as of September 30, 1998. In addition, Abbott purchased in May
1996, for $4.0 million, warrants to acquire 500,000 shares of common stock of
the Company. The warrants are exercisable over five years at $16.00 per share.
In October 1996, the Company and Abbott entered into an agreement expanding
Abbott's territory to include Europe, Latin America, Canada, Middle East, Africa
and certain Asia/Pacific countries. Under the October 1996 agreement, Abbott has
agreed to pay the Company certain additional license and milestone payments, a
portion of which will be credited against future royalties once EchoGen is
approved for commercial sale. As of September 30, 1998, $12.6 million has been
paid to the Company by Abbott under the October 1996 agreement of which $5.6
million is creditable against future royalties.

     The Company has granted Daiichi Pharmaceutical Co., Ltd. ("Daiichi"),
exclusive marketing and distribution rights to EchoGen in Japan and in certain
other countries in the Pacific Rim. As of September 30, 1998, Daiichi has paid
the Company option, license and milestone fees totaling $12.8 million. Under its
agreement with the Company, Daiichi has the responsibility to perform clinical
studies of EchoGen. Daiichi completed Phase 1 clinical studies in Japan
during 1997. Significant additional clinical studies will be required on EchoGen
for the product to be submitted for regulatory approval in Japan. To date
Daiichi has not initiated Phase 2 studies in Japan and there can be no assurance
that such studies will be timely commenced, or commenced at all.

     The Company's results of operations have varied and will continue to vary
significantly from quarter to quarter and depend on, among other factors, the
timing of milestone payments made by collaborative partners, the timing of
regulatory approvals, the entering into additional product license agreements by
the Company, and the timing and costs of the clinical trials conducted by the
Company. The Company's current collaborative partners can terminate their



                                       7
<PAGE>   8

agreements on short notice, and there can be no assurance that the Company will
receive any additional funding or milestone payments.

RESULTS OF OPERATIONS

     To date, the Company's reported revenues have been derived from payments
received under collaborative agreements with third parties. Revenue received
under collaborative agreements was $2.7 million for the third quarter of 1998
compared with $4.7 million for the same period of the prior year. For the nine
months ended September 30, 1998, payments received under collaborative
agreements were $5.1 million compared to $14.5 million for the nine months ended
September 30, 1997. All revenue during these periods represent payments under
the Company's strategic alliance agreements with Abbott.

     Research and development expenses were $3.0 million for the third quarter
of 1998 compared with $3.9 million in the prior year. The decrease was primarily
due to a reduction in clinical trial activity when compared to the prior period
offset in part by a higher level of activity supporting the regulatory approval
process. For the first nine months, research and development costs were $8.7
million compared to $9.4 million for the same period of the prior year. The
decrease for the nine month period was primarily due to a reduction in clinical
trial activity offset in part by the higher level of activity supporting the
regulatory approval process. In addition, the Company received $2.4 million from
Abbott in the first nine months of 1998 for reimbursement of certain clinical
costs related to prostate and stress echocardiography indications for EchoGen.
Pursuant to the funding agreement with Abbott, 50% or $1.2 million will be
repaid with interest in five years. Accordingly, $1.2 million has been reported
as a long-term liability with the remaining $1.2 million reported as an offset
to research and development expenses.

     General and administrative expenses were $1.9 million for the third quarter
of 1998 compared with $2.2 million in the prior year. The decrease was primarily
due to a reduction in marketing programs due to the delay in U.S. regulatory
approval of EchoGen, offset in part by increases in legal costs - see "Legal
Proceedings". For the first nine months of 1998, general and administrative
costs were $5.4 million compared to $5.0 million for the same period of the
prior year. The increase for the nine month period was primarily a result of the
costs of filing, prosecuting and protecting patents, offset in part by a
reduction in marketing programs.

     Revenues in future quarters will be primarily dependent upon the timing of
certain regulatory and commercialization milestones and associated payments
under collaborative agreements. In addition, total operating expenses may
increase in future quarters due to ongoing and planned clinical trials to study
additional indications for EchoGen and future products and due to higher
marketing and administrative expenses as the Company continues to prepare for
commercialization of EchoGen. The Company may also incur significant expenses
relating to legal matters - see "Legal Proceedings."

     Interest income, net of interest expense, was $162,000 and $598,000 for the
third quarter and first nine months of 1998, respectively, compared to $262,000
and $721,000 for the same periods of the prior year. The decrease was primarily
due to the lower levels of invested cash during these periods and the interest
expense on amounts payable to Abbott for clinical development funding.

LIQUIDITY AND CAPITAL RESOURCES

     The Company has historically financed its operations with payments from
collaborative agreements, proceeds from equity financings and a bank line of
credit. At September 30, 1998, the Company had cash, cash equivalents and
marketable securities of $20.3 million, compared to $26.6 million at December
31, 1997. The decrease was primarily due to the $8.4 million net loss reported
in the first nine months of 1998, offset in part by $1.2 million of clinical
development funding by Abbott which, under the agreements with Abbott, will be
repaid with interest in five years in stock or cash.

     The Company has a bank loan agreement which provides for a $5.0 million
revolving line of credit facility and bears interest at the prime rate plus 1.0%
per annum. At September 30, 1998 there was $5.0 million outstanding under the
line of credit. The line of credit was renewed in August 1998, expires August
31, 1999 and is secured by the tangible assets of the Company. The Company is
required to maintain certain minimum balances of cash and marketable 



                                       8
<PAGE>   9

securities in order to borrow under the line of credit. There can be no
assurance that the Company will be able to maintain the minimum balances
necessary to borrow under the line.

     The Company expects that its cash needs will increase significantly in
future periods due to pending and planned clinical trials and higher
administrative and marketing expenses as the Company prepares for
commercialization of EchoGen. The Company estimates that existing cash and
marketable securities will be sufficient to meet operating requirements through
early 1999. The Company's future capital requirements will, however, depend on
many factors, including the ability of the Company to obtain and retain
continued funding from third parties under collaborative agreements, the ability
to maintain the Company's bank line of credit, the time and costs required to
gain regulatory approvals, the progress of the Company's research and
development programs, clinical trials, the costs of filing, prosecuting and
enforcing patents, patent applications, patent claims and trademarks, the costs
of marketing and distribution, the status of competing products, and the market
acceptance and third-party reimbursement of the Company's products, if and when
approved. The Company believes it is likely that it will require substantial
working capital during 1999 and the Company intends to seek additional funding
through available means, which may include debt or equity financing or the
licensing or sale of proprietary or marketing rights. If regulatory approvals
are delayed, or funding under existing or future collaborative agreements is
delayed or reduced, the Company's requirement for additional working capital
would be accelerated. There can be no assurance that additional financing will
be available on acceptable terms, if at all. Any equity financing would likely
result in substantial dilution to existing stockholders. If the Company is
unable to raise additional financing, the Company would be required to curtail
or delay the development of its products.

YEAR 2000 COMPLIANCE

     During 1997 the Company completed a comprehensive review of software
applications used in critical business processes. The Company has determined
that all of its critical internal business systems are Year 2000 compliant.
There is no guarantee that the systems of the Company's collaborative partners
or significant vendors will be Year 2000 compliant. The Company is currently
investigating the Year 2000 compliance of collaborative partners and significant
vendors in order to develop contingency plans should these parties not be Year
2000 compliant. If the Company's collaborative partners or significant vendors
are not Year 2000 compliant, this could have an adverse effect on the ability of
collaborative partners or vendors to satisfy their obligations to the Company or
for the Company to electronically communicate with such parties.

FORWARD-LOOKING STATEMENTS

     This Report contains certain forward-looking statements within the meaning
of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the
Securities Exchange Act of 1934, as amended, and the Company intends that such
forward-looking statements be subject to the safe harbors created thereby.
Examples of these forward-looking statements include, but are not limited to,
(i) the progress and results of clinical trials, (ii) the submission of
applications for and the timing or likelihood of marketing approvals, (iii) the
Company's anticipated future capital requirements and the terms of any capital
financing, (iv) the anticipated outcome or financial impact of litigation; and
(v) the timing and amount of future milestone payments, product revenues and
expenses. While these statements made by the Company are based on management's
current beliefs and judgment, they are subject to risks and uncertainties that
could cause actual results to vary.

     In evaluating such statements, stockholders and investors should
specifically consider a number of factors and assumptions, including those
discussed in the text and the financial statements and their accompanying
footnotes in this Report and the risk factors detailed from time to time in the
Company's filings with the Securities and Exchange Commission. As discussed in
the Company's annual report on Form 10-K for the year ended December 31, 1997,
actual results could differ materially from those projected in the
forward-looking statements as a result of the following factors, among others:
uncertainty of governmental regulatory requirements; future capital requirements
and uncertainty of additional funding; uncertainty of market acceptance;
dependence on third parties for funding, clinical development and distribution;
unproven safety and efficacy; uncertainty of clinical trials; history of
operating losses; uncertainty of future financial results; dependence on patents
and proprietary rights; competition and risk of technological obsolescence;
limited manufacturing experience; dependence on limited contract manufacturers
and suppliers; lack of marketing and sales experience; and limitations on
third-party reimbursement. 



                                       9
<PAGE>   10

PART II. OTHER INFORMATION

ITEM 1.  LEGAL PROCEEDINGS

     On January 7, 1998, the Company announced that it had filed a patent
infringement action in the U.S. District Court in Seattle, Washington, against
Molecular Biosystems Inc. ("MBI") and Mallinckrodt, Inc. The suit alleges that
one of MBI's ultrasound contrast agents infringes one or more of the Company's
patents. MBI has filed counterclaims alleging that the patents asserted by the
Company are invalid and not infringed, and that the Company has made false
public statements and engaged in other actions intended to damage MBI and one of
its ultrasound contrast agents. The Company does not believe there is any merit 
to these counterclaims and intends to defend its position vigorously. A trial 
date has been set for this lawsuit in August 1999. In October 1998, the court 
granted the Company's motion to stay the litigation until the U.S. Patent and 
Trademark Office ("PTO") has completed its re-examination of the patents in 
this lawsuit (see below).

     The re-examination of the patents was initiated by the PTO in July 1997
based on petition filed by MBI. The outcome of these re-examination proceedings
may have a significant impact on the above-identified patent infringement
action. Although the PTO has issued final rejections of the claims in the SONUS
patents at issue, the Company has responded to these rejections and is awaiting
a further PTO decision. The PTO may decide that the responses overcome the
rejections, or the PTO may maintain its rejections. The Company has the right to
appeal the rejections if they are maintained.

     In August 1998, the Company announced that it had received notice of
alleged class action complaints filed in the Superior Court of Washington and in
the U.S. District Court for the Western District of Washington against the
Company and certain of its officers and directors, alleging violations of the
Washington State Securities Act, the Washington Consumer Protection Act and the
U.S. Securities Exchange Act of 1934. The Company has moved to dismiss and stay
the State court action and expects to move to dismiss the federal actions once
lead plaintiffs are appointed and a consolidated complaint is filed. The Company
does not believe there is any merit to the claims in these actions and intends
to defend its position vigorously.

ITEM 6.  EXHIBITS AND REPORTS ON FORM 8-K

     (a)   EXHIBITS

<TABLE>
<CAPTION>
           Number  Description
           ------  -----------
           <S>     <C>                                                                
           10.30   Change in Control Agreement for Steven C. Quay, M.D., Ph.D.
           10.31   Change in Control Agreement for Michael A. Martino
           10.32   Change in Control Agreement for Gregory Sessler
           11.1    Computation of net income (loss) per share
</TABLE>

     (b)   REPORTS ON FORM 8-K

           The Company filed no reports on Form 8-K during the quarter ended 
           September 30, 1998.


ITEMS 2, 3, 4 AND 5 ARE NOT APPLICABLE AND HAVE BEEN OMITTED.



                                       10
<PAGE>   11

SIGNATURES


In accordance with the requirements of the Exchange Act, the registrant caused
this report to be signed on its behalf by the undersigned, thereunto duly
authorized.

                                            SONUS PHARMACEUTICALS, INC.

Date: November 10, 1998                     By: /s/  Gregory Sessler
                                               ---------------------------------
                                               Gregory Sessler
                                               Chief Financial Officer and 
                                               Assistant Secretary (Principal 
                                               Financial and Accounting Officer)



                                       11

<PAGE>   1
                               September 15, 1998


Steven C. Quay, M.D., Ph.D.
President and Chief Executive Officer
c/o SONUS Pharmaceuticals, Inc.
22026 20th Avenue
Bothell, Washington  98021

        Re: Change In Control Agreement

Dear Steve:

        In consideration of your employment with SONUS Pharmaceuticals, Inc., a
Delaware corporation (the "Company"), this letter agreement ( the "Agreement")
sets forth the compensation and benefits you will be entitled to receive in the
event your employment terminates in connection with a change in control of the
Company under the conditions described below. This Agreement takes effect on the
date you commence employment with the Company.

1.      TERMINATION OF EMPLOYMENT.

        1.1. During the term of this Agreement, you will be entitled to the
benefits provided in Section 2 of this Agreement in the event (A) a Change in
Control has occurred; and (B) (i) you terminate your employment with the Company
for Good Reason within 12 months following the Change of Control, or (ii) the
Company terminates your employment for reasons other than Cause, Disability, or
your death within 12 months following the Change of Control, provided you
fulfill your obligations under this Agreement.

        1.2. For purposes of this Agreement, the term "Change in Control" shall
mean (i) a sale of fifty percent (50%) or more of the outstanding shares of
common stock of the Company; (ii) a sale of all or substantially all of the
assets of the Company, or (iii) a merger, consolidation or reorganization
whereby the stockholders of the Company immediately prior to the consummation of
such merger, consolidation or reorganization own less than fifty percent (50%)
of the outstanding shares of common stock immediately following the consummation
of the merger, consolidation or reorganization.

        1.3. For purposes of this Agreement, the term "Good Reason" shall mean
any of the following, if done without your consent:

             1.3.1. A substantial diminution in your duties and responsibilities
to a level substantially beneath that of your duties and responsibilities at the
outset of your employment under this Agreement other than actions that are not
taken in bad faith and are remedied by the Company within thirty days after
written notice by you;

             1.3.2. A reduction by the Company in your current annual base 
salary unless such reduction is attributable to an across the board salary
reduction for all of management personnel of the Company and then only if the
percentage of your reduction is (i) not greater than 20%, and (ii) no greater in
percentage than that of the other management personnel;

             1.3.3. The Company  requires the relocation of your base of 
employment outside the Seattle, Washington metropolitan area;


<PAGE>   2
             1.3.4. A material breach by the Company of any of the terms and
provisions of this Agreement, which is not cured within 30 days of written
notice by you of such breach; or

             1.3.5. the failure of the Company to obtain a satisfactory
agreement from any successor in a Change of Control to assume and agree to
perform this Agreement, as contemplated in Section 6 hereof.

        1.4.  For purposes of this Agreement, the term "Cause" shall mean any of
the following: (i) your willful and continued failure or refusal to perform your
duties with the Company; (b) your willfully engaging in gross misconduct
injurious to the Company; (c) your being convicted or pleading guilty or nolo
contendere to any misdemeanor involving moral turpitude or to any felony; (d)
your having materially breached any provision of this Agreement, or any
agreement concerning confidentiality or ownership of inventions with the Company
and failed to cure such breach to the reasonable satisfaction of the Company
promptly after receiving written notice of breach if such cure is possible.

        1.5. For purposes of this Agreement, the term "Disability" shall mean
your inability to perform the essential functions of your position due to any
physical or mental illness even with reasonable accommodation to the extent
required by law, for any period of six months in the aggregate during any twelve
months, provided the Company has given you a written demand to return to your
fill time duties.

        1.6.  Any termination of employment by you or by the Company pursuant to
this Agreement shall be communicated by written Notice of Termination indicating
the termination provision in this Agreement relied upon, if any. For purposes of
this Agreement, the "Date of Termination" shall mean the date specified in the
Notice of Termination which shall not be earlier than ten (10) business days
after the date on the Notice of Termination is given and the expiration of any
time period given to cure a breach as provided in Section 1.4(d) of this
Agreement.

2.      COMPENSATION UPON TERMINATION.

        2.1. If your employment shall be terminated and you are entitled to
benefits under Section 1 of this Agreement then you shall receive the following
benefits:

             2.1.1. the Company shall pay to you in a lump sum within ten days
following the Date of Termination (a) your base salary unpaid through the Date
of Termination at the rate in effect as of the time of Notice of Termination and
(b) an amount equal to the value as of the Date of Termination of the deferred
portion of any bonus which has been declared but is unpaid under any incentive
compensation plan or program of the Company then in effect;

             2.1.2. the Company shall pay to you as severance pay in a lump sum 
within thirty days following the Date of Termination an amount equal to the
product of (a) the sum of your highest annual base salary in effect any time
during the twelve (12) month period prior to the Date of Termination, multiplied
by 2.99; and

             2.1.3. the Company shall maintain in full force and effect, for the
continued benefit of you for three years after the Date of Termination, or, if
sooner, until you are employed in a full-time capacity by another employer, all
non-cash health and welfare plans and programs (excluding 401(k) or any employee
bonus plans and programs or retirement plans or programs) in which you
participated immediately prior to the Date of Termination provided that your
continued participation is permissible under the general terms and provisions of
such plans and programs. In the event that your participation in any such plan
or program is barred, the Company shall arrange to provide you with benefits
substantially similar to those which you are entitled to receive under such
plans and programs at no cost to you. At the end of the period of coverage, you
shall have the option to have assigned to you at no cost and with no
apportionment of prepaid premiums, any assignable insurance policy owned by the
Company and relating to specifically to you.

        2.2. Notwithstanding Section 1, the respective obligations of, and
benefits afforded to, the Company and you as provided in this Section 2, shall
survive termination of this Agreement.

                                       2
<PAGE>   3

        2.3. No compensation or benefits shall be due under this Agreement in
the event your employment is terminated by you or the Company in circumstances
other than those described in Section 1.1, including but not limited to a
termination by you for any reason other than Good Reason, a termination by the
Company for Cause, Disability, or death, or any termination that does not occur
within twelve months following a Change in Control.

        2.4. To the extent that any or all of the payments and benefits provided
for in this Agreement constitute "parachute payments" within the meaning of
Section 280G of the Internal Revenue Code (the "Code") and, but for this Section
2.4 would be subject to the excise tax imposed by Section 4999 of the Code, the
aggregate amount of such payments and benefits shall be reduced such that the
present value thereof (as determined under the Code and applicable regulations)
is equal to 2.99 times the Executive's "base amount" (as defined in the Code).
The determination of any reduction of any payment or benefits under Section 2
pursuant to the foregoing provision shall be made by a nationally recognized
public accounting firm chosen by the Company in good faith, and such
determination shall be conclusive and binding on the Company and you.

3.      OTHER BENEFITS.

        In the event you are entitled to any compensation or benefits under this
Agreement, you shall not be entitled to any other severance compensation or
benefits under any other policy or agreement with the Company.

4.      PROPRIETARY INFORMATION AND UNFAIR COMPETITION.

        4.1.  You acknowledge that in the course of your employment with the
Company, you will be entrusted with access to extensive confidential information
of the Company concerning its products and service, methods of manufacture,
research and development, know-how, patents, copyrights, trademarks, and other
proprietary data, as well as the identity, needs, and preferences of its
customers and prospects, all of which the Company considers its legally
protected trade secrets and intellectual property. You further acknowledge the
highly competitive nature of the business of the Company, and the fact that
unauthorized disclosure or use of such trade secrets and intellectual property
would be inevitable if you were to compete with the Company or solicit competing
business from its prospects and customers. You therefore agree that in the event
of a termination following a Change of Control as described in this Agreement,
the following provisions shall apply:

        4.2. Commencing on the Date of Termination, and ending two years
thereafter (the "Non-Compete Period"), you will not provide goods or services to
or become an employee, owner (except for passive investments of not more than
three percent of the outstanding shares of, or any other equity interest in, any
company or entity listed or traded on a national securities exchange or in an
over-the-counter securities market), officer, agent, consultant, advisor or
director of any firm or person in any geographic area which competes in the
"Business". For purposes of this Agreement, the term "Business" shall mean the
research, design, development, manufacture, sale or distribution of ultrasound
contrast agents.

        4.3. During the Non-Compete Period, you will not directly or indirectly
induce any employee of the Company or any of its affiliates to engage in any
activity in which you are prohibited from engaging by paragraph 5.1 above, or to
terminate such employee's employment with the Company, or any of its affiliates,
and will not directly or indirectly employ or offer employment to any person who
was employed by the Company or any of its affiliates unless such person shall
cease to be employed by the Company or any of its affiliates for a period of at
least 12 months; provided, however, that this provision shall not apply to any
person who is no longer an employee of the Company or any of its affiliates as
of a result of actions taken by the Company or its affiliates.

        4.4. During the Non-Compete Period, you will refrain from making any
statement which has the effect of demeaning the name or the business reputation
of the Company or its subsidiaries or affiliates, or any officer or employee
thereof, or which materially adversely effects the best interests (economic or
otherwise) of the Company, its subsidiaries or affiliates.

        4.5. It is expressly understood and agreed that although you and the
Company consider the restrictions contained in this Section 5 to be reasonable,
if a final judicial determination is made by a court of jurisdiction that 


                                       3
<PAGE>   4
the time or territory or any other restriction contained in this Agreement is an
unenforceable restriction against you, provisions of this Agreement shall not be
rendered void, but shall be deemed amended to apply to such maximum time and
territory and to such maximum extent as such court may judicially determine or
indicate to be enforceable. Alternatively, if any court of competent
jurisdiction finds that any restriction contained in this Agreement is
unenforceable, and such restriction cannot be amended so as to make it
enforceable, such finding shall not effect the enforceability of any of the
other restriction contained herein.

5.      MISCELLANEOUS.

        Any payment required under this Agreement shall be subject to all
requirements of the law with regard to withholding, filing, making of reports
and the like, and the Company shall use its commercially reasonable best efforts
to satisfy promptly all such requirements. No provisions of this Agreement may
be modified, waived or discharged unless such waiver, modification or discharge
is agreed to in a writing signed by both parties. The validity, interpretation,
construction and performance of this Agreement shall be governed by the law of
the State of Delaware.

6.      SUCCESSORS AND ASSIGNMENT.

        This agreement and all of your rights thereunder shall inure to the
benefit of and be enforceable by your personal or legal representatives,
executors, administrators, successors, heirs, distributees, devisees and
legatees. Except as expressly provided in this Agreement, this Agreement is
personal to you and may not be assigned to you. If you should die while any
amounts would still be payable to you hereunder if you had continued to live,
all such amounts, unless otherwise provided herein, shall be paid in accordance
with the terms of this Agreement to your devisee, legatee, or other designee or,
if there be no such designee, to your estate. This Agreement shall be binding
upon any successor to the Company (whether direct or indirect, by purchase,
merger, consolidation or otherwise) to all or substantially all of the business
and/or assets of the Company.

7.      TERM OF AGREEMENT.

        This Agreement shall commence as of the date of this Agreement and shall
terminate on the earliest of (i) three (3) years from the date of this
Agreement, (ii) the termination of your employment by the Company for Cause,
Disability or death; (iii) your termination of employment other than for Good
Reason or (iv) your reaching age 65.

8.      NO GUARANTEE OF CONTINUED EMPLOYMENT.

        This Agreement is intended solely to provide you with certain
compensation and benefits in the event your employment terminates in the
circumstances described in Section 1.1. Nothing in this Agreement constitutes or
implies any specific term of employment. You acknowledge and agree that your
employment with the Company can be terminated by you or the Company at any time
with or without cause or prior warning, as provided in your written offer of
employment dated September 15, 1998. Nothing in this Agreement limits or
supersedes any other agreements between you and the Company concerning
confidentiality or ownership of intellectual property.

9.      MEDIATION.

        In the event that the Company terminates you for Cause and you dispute
its right to do so or you claim that your are entitled to terminate your
employment for Good Reason and the Company disputes your right to do so, a
mediator acceptable to you and the Company will be appointed within ten (10)
days to assist in reaching a mutually satisfactory resolution but will have no
authority to issue a binding decision. Such mediation must be concluded within
60 days of the date of termination or claim to termination. Should such
mediation fail to reach an acceptable conclusion and you are successful in any
litigation or settlement that issues from such dispute, you shall be entitled to
receive from the Company all of the expenses incurred by you in connection with
any such dispute including reasonable attorney's fees.




                                       4
<PAGE>   5
        If this Agreement is acceptable to you, kindly sign and return to the
Company the enclosed copy of this letter.

                                   Sincerely,

                                   SONUS Pharmaceuticals, Inc.



                                   By:  /s/ Gregory Sessler



AGREED AND ACCEPTED:


/s/ Steven C. Quay, M.D., Ph.D.

Steven C. Quay, M.D., Ph.D.

Dated:  September  16, 1998

                                       5

<PAGE>   1
                               September 15, 1998



Mr. Michael Martino
c/o SONUS Pharmaceuticals, Inc.
22026 20th Avenue
Bothell, Washington  98021

        Re:  Change In Control Agreement

Dear Michael:

        In consideration of your employment with SONUS Pharmaceuticals, Inc., a
Delaware corporation (the "Company"), this letter agreement ( the "Agreement")
sets forth the compensation and benefits you will be entitled to receive in the
event your employment terminates in connection with a change in control of the
Company under the conditions described below. This Agreement takes effect on the
date you commence employment with the Company.

1.      TERMINATION OF EMPLOYMENT.

        1.1. During the term of this Agreement, you will be entitled to the
benefits provided in Section 2 of this Agreement in the event (A) a Change in
Control has occurred; and (B) (i) you terminate your employment with the Company
for Good Reason within 12 months following the Change of Control, or (ii) the
Company terminates your employment for reasons other than Cause, Disability, or
your death within 12 months following the Change of Control, provided you
fulfill your obligations under this Agreement.

        1.2. For purposes of this Agreement, the term "Change in Control" shall
mean (i) a sale of fifty percent (50%) or more of the outstanding shares of
common stock of the Company; (ii) a sale of all or substantially all of the
assets of the Company, or (iii) a merger, consolidation or reorganization
whereby the stockholders of the Company immediately prior to the consummation of
such merger, consolidation or reorganization own less than fifty percent (50%)
of the outstanding shares of common stock immediately following the consummation
of the merger, consolidation or reorganization.

        1.3.  For purposes of this Agreement, the term "Good Reason" shall mean
any of the following, if done without your consent:

              1.3.1. A substantial diminution in your duties and
responsibilities to a level substantially beneath that of your duties and
responsibilities at the outset of your employment under this Agreement other
than actions that are not taken in bad faith and are remedied by the Company
within thirty days after written notice by you;

              1.3.2. A reduction by the Company in your current annual base
salary unless such reduction is attributable to an across the board salary
reduction for all of management personnel of the Company and then only if the
percentage of your reduction is (i) not greater than 20%, and (ii) no greater in
percentage than that of the other management personnel;


<PAGE>   2

             1.3.3. The Company requires the relocation of your base of 
employment outside the Seattle, Washington metropolitan area;

             1.3.4. A material breach by the Company of any of the terms and
provisions of this Agreement, which is not cured within 30 days of written
notice by you of such breach; or

             1.3.5. the failure of the Company to obtain a satisfactory
agreement from any successor in a Change of Control to assume and agree to
perform this Agreement, as contemplated in Section 6 hereof.

        1.4.  For purposes of this Agreement, the term "Cause" shall mean any of
the following: (i) your willful and continued failure or refusal to perform your
duties with the Company; (b) your willfully engaging in gross misconduct
injurious to the Company; (c) your being convicted or pleading guilty or nolo
contendere to any misdemeanor involving moral turpitude or to any felony; (d)
your having materially breached any provision of this Agreement, or any
agreement concerning confidentiality or ownership of inventions with the Company
and failed to cure such breach to the reasonable satisfaction of the Company
promptly after receiving written notice of breach if such cure is possible.

        1.5. For purposes of this Agreement, the term "Disability" shall mean
your inability to perform the essential functions of your position due to any
physical or mental illness even with reasonable accommodation to the extent
required by law, for any period of six months in the aggregate during any twelve
months, provided the Company has given you a written demand to return to your
fill time duties.

        1.6. Any termination of employment by you or by the Company pursuant to
this Agreement shall be communicated by written Notice of Termination indicating
the termination provision in this Agreement relied upon, if any. For purposes of
this Agreement, the "Date of Termination" shall mean the date specified in the
Notice of Termination which shall not be earlier than ten (10) business days
after the date on the Notice of Termination is given and the expiration of any
time period given to cure a breach as provided in Section 1.4(d) of this
Agreement.

2.      COMPENSATION UPON TERMINATION.

        2.1. If your employment shall be terminated and you are entitled to
benefits under Section 1 of this Agreement then you shall receive the following
benefits:

             2.1.1. the Company shall pay to you in a lump sum within ten days
following the Date of Termination (a) your base salary unpaid through the Date
of Termination at the rate in effect as of the time of Notice of Termination and
(b) an amount equal to the value as of the Date of Termination of the deferred
portion of any bonus which has been declared but is unpaid under any incentive
compensation plan or program of the Company then in effect;

             2.1.2. the Company shall pay to you as severance pay in a lump sum 
within thirty days following the Date of Termination an amount equal to the
product of (a) the sum of your highest annual base salary in effect any time
during the twelve (12) month period prior to the Date of Termination, multiplied
by 2.99; and

             2.1.3. the Company shall maintain in full force and effect, for
the continued benefit of you for three years after the Date of Termination, or,
if sooner, until you are employed in a full-time capacity by another employer,
all non-cash health and welfare plans and programs (excluding 401(k) or any
employee bonus plans and programs or retirement plans or programs) in which you
participated immediately prior to the Date of Termination provided that your
continued participation is permissible under the general terms and provisions of
such plans and programs. In the event that your participation in any such plan
or program is barred, the Company shall arrange to provide you with benefits
substantially similar to those which you are entitled to receive under such
plans and programs at no cost to you. At the end of the period of coverage, you
shall have the option to have assigned to you at no cost and with no
apportionment of prepaid premiums, any assignable insurance policy owned by the
Company and relating to specifically to you.

                                       2
<PAGE>   3

        2.2. Notwithstanding Section 1, the respective obligations of, and
benefits afforded to, the Company and you as provided in this Section 2, shall
survive termination of this Agreement.

        2.3. No compensation or benefits shall be due under this Agreement in
the event your employment is terminated by you or the Company in circumstances
other than those described in Section 1.1, including but not limited to a
termination by you for any reason other than Good Reason, a termination by the
Company for Cause, Disability, or death, or any termination that does not occur
within twelve months following a Change in Control.

        2.4. To the extent that any or all of the payments and benefits provided
for in this Agreement constitute "parachute payments" within the meaning of
Section 280G of the Internal Revenue Code (the "Code") and, but for this Section
2.4 would be subject to the excise tax imposed by Section 4999 of the Code, the
aggregate amount of such payments and benefits shall be reduced such that the
present value thereof (as determined under the Code and applicable regulations)
is equal to 2.99 times the Executive's "base amount" (as defined in the Code).
The determination of any reduction of any payment or benefits under Section 2
pursuant to the foregoing provision shall be made by a nationally recognized
public accounting firm chosen by the Company in good faith, and such
determination shall be conclusive and binding on the Company and you.

3.      OTHER BENEFITS.

        In the event you are entitled to any compensation or benefits under this
Agreement, you shall not be entitled to any other severance compensation or
benefits under any other policy or agreement with the Company.

4.      PROPRIETARY INFORMATION AND UNFAIR COMPETITION.

        4.1. You acknowledge that in the course of your employment with the
Company, you will be entrusted with access to extensive confidential information
of the Company concerning its products and service, methods of manufacture,
research and development, know-how, patents, copyrights, trademarks, and other
proprietary data, as well as the identity, needs, and preferences of its
customers and prospects, all of which the Company considers its legally
protected trade secrets and intellectual property. You further acknowledge the
highly competitive nature of the business of the Company, and the fact that
unauthorized disclosure or use of such trade secrets and intellectual property
would be inevitable if you were to compete with the Company or solicit competing
business from its prospects and customers. You therefore agree that in the event
of a termination following a Change of Control as described in this Agreement,
the following provisions shall apply:

        4.2. Commencing on the Date of Termination, and ending two years
thereafter (the "Non-Compete Period"), you will not provide goods or services to
or become an employee, owner (except for passive investments of not more than
three percent of the outstanding shares of, or any other equity interest in, any
company or entity listed or traded on a national securities exchange or in an
over-the-counter securities market), officer, agent, consultant, advisor or
director of any firm or person in any geographic area which competes in the
"Business". For purposes of this Agreement, the term "Business" shall mean the
research, design, development, manufacture, sale or distribution of ultrasound
contrast agents.

        4.3. During the Non-Compete Period, you will not directly or indirectly
induce any employee of the Company or any of its affiliates to engage in any
activity in which you are prohibited from engaging by paragraph 4.1 above, or to
terminate such employee's employment with the Company, or any of its affiliates,
and will not directly or indirectly employ or offer employment to any person who
was employed by the Company or any of its affiliates unless such person shall
cease to be employed by the Company or any of its affiliates for a period of at
least 12 months; provided, however, that this provision shall not apply to any
person who is no longer an employee of the Company or any of its affiliates as
of a result of actions taken by the Company or its affiliates.

        4.4. During the Non-Compete Period, you will refrain from making any
statement which has the effect of demeaning the name or the business reputation
of the Company or its subsidiaries or affiliates, or any officer or employee
thereof, or which materially adversely effects the best interests (economic or
otherwise) of the Company, its subsidiaries or affiliates.

                                       3
<PAGE>   4
        4.5. It is expressly understood and agreed that although you and the
Company consider the restrictions contained in this Section 4 to be reasonable,
if a final judicial determination is made by a court of jurisdiction that the
time or territory or any other restriction contained in this Agreement is an
unenforceable restriction against you, provisions of this Agreement shall not be
rendered void, but shall be deemed amended to apply to such maximum time and
territory and to such maximum extent as such court may judicially determine or
indicate to be enforceable. Alternatively, if any court of competent
jurisdiction finds that any restriction contained in this Agreement is
unenforceable, and such restriction cannot be amended so as to make it
enforceable, such finding shall not effect the enforceability of any of the
other restriction contained herein.

5.      MISCELLANEOUS.

        Any payment required under this Agreement shall be subject to all
requirements of the law with regard to withholding, filing, making of reports
and the like, and the Company shall use its commercially reasonable best efforts
to satisfy promptly all such requirements. No provisions of this Agreement may
be modified, waived or discharged unless such waiver, modification or discharge
is agreed to in a writing signed by both parties. The validity, interpretation,
construction and performance of this Agreement shall be governed by the law of
the State of Delaware.

6.      SUCCESSORS AND ASSIGNMENT.

        This agreement and all of your rights thereunder shall inure to the
benefit of and be enforceable by your personal or legal representatives,
executors, administrators, successors, heirs, distributees, devisees and
legatees. Except as expressly provided in this Agreement, this Agreement is
personal to you and may not be assigned to you. If you should die while any
amounts would still be payable to you hereunder if you had continued to live,
all such amounts, unless otherwise provided herein, shall be paid in accordance
with the terms of this Agreement to your devisee, legatee, or other designee or,
if there be no such designee, to your estate. This Agreement shall be binding
upon any successor to the Company (whether direct or indirect, by purchase,
merger, consolidation or otherwise) to all or substantially all of the business
and/or assets of the Company.

7.      TERM OF AGREEMENT.

        This Agreement shall commence as of the date of this Agreement and shall
terminate on the earliest of (i) three (3) years from the date of this
Agreement, (ii) the termination of your employment by the Company for Cause,
Disability or death; (iii) your termination of employment other than for Good
Reason or (iv) your reaching age 65.

8.      NO GUARANTEE OF CONTINUED EMPLOYMENT.

        This Agreement is intended solely to provide you with certain
compensation and benefits in the event your employment terminates in the
circumstances described in Section 1.1. Nothing in this Agreement constitutes or
implies any specific term of employment. You acknowledge and agree that your
employment with the Company can be terminated by you or the Company at any time
with or without cause or prior warning, as provided in your written offer of
employment dated September 15, 1998. Nothing in this Agreement limits or
supersedes any other agreements between you and the Company concerning
confidentiality or ownership of intellectual property.

9.      MEDIATION.

        In the event that the Company terminates you for Cause and you dispute
its right to do so or you claim that your are entitled to terminate your
employment for Good Reason and the Company disputes your right to do so, a
mediator acceptable to you and the Company will be appointed within ten (10)
days to assist in reaching a mutually satisfactory resolution but will have no
authority to issue a binding decision. Such mediation must be concluded within
60 days of the date of termination or claim to termination. Should such
mediation fail to reach an acceptable conclusion and you are successful in any
litigation or settlement that issues from such dispute, you shall be entitled 


                                       4
<PAGE>   5
to receive from the Company all of the expenses incurred by you in connection
with any such dispute including reasonable attorney's fees.




        If this Agreement is acceptable to you, kindly sign and return to the
Company the enclosed copy of this letter.

                                   Sincerely,

                                   SONUS Pharmaceuticals, Inc.



                                   By:  /s/ Steven C. Quay, M.D., Ph.D.


AGREED AND ACCEPTED:


/s/ Michael Martino

Michael Martino

Dated:  September  16, 1998

                                       5

<PAGE>   1
                               September 15, 1998



Mr. Greg Sessler
Vice President and Chief Financial Officer
c/o SONUS Pharmaceuticals, Inc.
22026 20th Avenue, Suite 201
Bothell, Washington  98021

        Re:  Change In Control Agreement

Dear Greg:

        In consideration of your employment with SONUS Pharmaceuticals, Inc., a
Delaware corporation (the "Company"), this letter agreement ( the "Agreement")
sets forth the compensation and benefits you will be entitled to receive in the
event your employment terminates in connection with a change in control of the
Company under the conditions described below. This Agreement takes effect on the
date you commence employment with the Company.

1.      TERMINATION OF EMPLOYMENT.

        1.1. During the term of this Agreement, you will be entitled to the
benefits provided in Section 2 of this Agreement in the event (A) a Change in
Control has occurred; and (B) (i) you terminate your employment with the Company
for Good Reason within 12 months following the Change of Control, or (ii) the
Company terminates your employment for reasons other than Cause, Disability, or
your death within 12 months following the Change of Control, provided you
fulfill your obligations under this Agreement.

        1.2. For purposes of this Agreement, the term "Change in Control" shall
mean (i) a sale of fifty percent (50%) or more of the outstanding shares of
common stock of the Company; (ii) a sale of all or substantially all of the
assets of the Company, or (iii) a merger, consolidation or reorganization
whereby the stockholders of the Company immediately prior to the consummation of
such merger, consolidation or reorganization own less than fifty percent (50%)
of the outstanding shares of common stock immediately following the consummation
of the merger, consolidation or reorganization.

        1.3. For purposes of this Agreement, the term "Good Reason" shall mean
any of the following, if done without your consent:

             1.3.1. A substantial diminution in your duties and
responsibilities to a level substantially beneath that of your duties and
responsibilities at the outset of your employment under this Agreement other
than actions that are not taken in bad faith and are remedied by the Company
within thirty days after written notice by you;

             1.3.2. A reduction by the Company in your current annual base
salary unless such reduction is attributable to an across the board salary
reduction for all of management personnel of the Company and then only if the
percentage of your reduction is (i) not greater than 20%, and (ii) no greater in
percentage than that of the other management personnel;

             1.3.3. The Company requires the relocation of your base of
employment outside the Seattle, Washington metropolitan area;


<PAGE>   2
             1.3.4. A material breach by the Company of any of the terms and
provisions of this Agreement, which is not cured within 30 days of written
notice by you of such breach; or

             1.3.5. the failure of the Company to obtain a satisfactory
agreement from any successor in a Change of Control to assume and agree to
perform this Agreement, as contemplated in Section 6 hereof.

        1.4.  For purposes of this Agreement, the term "Cause" shall mean any of
the following: (i) your willful and continued failure or refusal to perform your
duties with the Company; (b) your willfully engaging in gross misconduct
injurious to the Company; (c) your being convicted or pleading guilty or nolo
contendere to any misdemeanor involving moral turpitude or to any felony; (d)
your having materially breached any provision of this Agreement, or any
agreement concerning confidentiality or ownership of inventions with the Company
and failed to cure such breach to the reasonable satisfaction of the Company
promptly after receiving written notice of breach if such cure is possible.

        1.5. For purposes of this Agreement, the term "Disability" shall mean
your inability to perform the essential functions of your position due to any
physical or mental illness even with reasonable accommodation to the extent
required by law, for any period of six months in the aggregate during any twelve
months, provided the Company has given you a written demand to return to your
fill time duties.

        1.6. Any termination of employment by you or by the Company pursuant to
this Agreement shall be communicated by written Notice of Termination indicating
the termination provision in this Agreement relied upon, if any. For purposes of
this Agreement, the "Date of Termination" shall mean the date specified in the
Notice of Termination which shall not be earlier than ten (10) business days
after the date on the Notice of Termination is given and the expiration of any
time period given to cure a breach as provided in Section 1.4(d) of this
Agreement.

2.      COMPENSATION UPON TERMINATION.

        2.1. If your employment shall be terminated and you are entitled to
benefits under Section 1 of this Agreement then you shall receive the following
benefits:

             2.1.1. the Company shall pay to you in a lump sum within ten days
following the Date of Termination (a) your base salary unpaid through the Date
of Termination at the rate in effect as of the time of Notice of Termination and
(b) an amount equal to the value as of the Date of Termination of the deferred
portion of any bonus which has been declared but is unpaid under any incentive
compensation plan or program of the Company then in effect;

             2.1.2. the Company shall pay to you as severance pay in a lump sum 
within thirty days following the Date of Termination an amount equal to the
product of (a) the sum of your highest annual base salary in effect any time
during the twelve (12) month period prior to the Date of Termination, multiplied
by 2.99; and

             2.1.3. the Company shall maintain in full force and effect, for the
continued benefit of you for three years after the Date of Termination, or,
if sooner, until you are employed in a full-time capacity by another employer,
all non-cash health and welfare plans and programs (excluding 401(k) or any
employee bonus plans and programs or retirement plans or programs) in which you
participated immediately prior to the Date of Termination provided that your
continued participation is permissible under the general terms and provisions of
such plans and programs. In the event that your participation in any such plan
or program is barred, the Company shall arrange to provide you with benefits
substantially similar to those which you are entitled to receive under such
plans and programs at no cost to you. At the end of the period of coverage, you
shall have the option to have assigned to you at no cost and with no
apportionment of prepaid premiums, any assignable insurance policy owned by the
Company and relating to specifically to you.

        2.2. Notwithstanding Section 1, the respective obligations of, and
benefits afforded to, the Company and you as provided in this Section 2, shall
survive termination of this Agreement.

                                       2
<PAGE>   3

        2.3. No compensation or benefits shall be due under this Agreement in
the event your employment is terminated by you or the Company in circumstances
other than those described in Section 1.1, including but not limited to a
termination by you for any reason other than Good Reason, a termination by the
Company for Cause, Disability, or death, or any termination that does not occur
within twelve months following a Change in Control.

        2.4. To the extent that any or all of the payments and benefits provided
for in this Agreement constitute "parachute payments" within the meaning of
Section 280G of the Internal Revenue Code (the "Code") and, but for this Section
2.4 would be subject to the excise tax imposed by Section 4999 of the Code, the
aggregate amount of such payments and benefits shall be reduced such that the
present value thereof (as determined under the Code and applicable regulations)
is equal to 2.99 times the Executive's "base amount" (as defined in the Code).
The determination of any reduction of any payment or benefits under Section 2
pursuant to the foregoing provision shall be made by a nationally recognized
public accounting firm chosen by the Company in good faith, and such
determination shall be conclusive and binding on the Company and you.

3.      OTHER BENEFITS.

        In the event you are entitled to any compensation or benefits under this
Agreement, you shall not be entitled to any other severance compensation or
benefits under any other policy or agreement with the Company.

4.      PROPRIETARY INFORMATION AND UNFAIR COMPETITION.

        4.1.  You acknowledge that in the course of your employment with the
Company, you will be entrusted with access to extensive confidential information
of the Company concerning its products and service, methods of manufacture,
research and development, know-how, patents, copyrights, trademarks, and other
proprietary data, as well as the identity, needs, and preferences of its
customers and prospects, all of which the Company considers its legally
protected trade secrets and intellectual property. You further acknowledge the
highly competitive nature of the business of the Company, and the fact that
unauthorized disclosure or use of such trade secrets and intellectual property
would be inevitable if you were to compete with the Company or solicit competing
business from its prospects and customers. You therefore agree that in the event
of a termination following a Change of Control as described in this Agreement,
the following provisions shall apply:

        4.2.  Commencing on the Date of Termination, and ending two years
thereafter (the "Non-Compete Period"), you will not provide goods or services to
or become an employee, owner (except for passive investments of not more than
three percent of the outstanding shares of, or any other equity interest in, any
company or entity listed or traded on a national securities exchange or in an
over-the-counter securities market), officer, agent, consultant, advisor or
director of any firm or person in any geographic area which competes in the
"Business". For purposes of this Agreement, the term "Business" shall mean the
research, design, development, manufacture, sale or distribution of ultrasound
contrast agents.

        4.3.  During the Non-Compete Period, you will not directly or indirectly
induce any employee of the Company or any of its affiliates to engage in any
activity in which you are prohibited from engaging by paragraph 5.1 above, or to
terminate such employee's employment with the Company, or any of its affiliates,
and will not directly or indirectly employ or offer employment to any person who
was employed by the Company or any of its affiliates unless such person shall
cease to be employed by the Company or any of its affiliates for a period of at
least 12 months; provided, however, that this provision shall not apply to any
person who is no longer an employee of the Company or any of its affiliates as
of a result of actions taken by the Company or its affiliates.

        4.4.  During the Non-Compete Period, you will refrain from making any
statement which has the effect of demeaning the name or the business reputation
of the Company or its subsidiaries or affiliates, or any officer or employee
thereof, or which materially adversely effects the best interests (economic or
otherwise) of the Company, its subsidiaries or affiliates.

        4.5. It is expressly understood and agreed that although you and the
Company consider the restrictions contained in this Section 5 to be reasonable,
if a final judicial determination is made by a court of jurisdiction that 


                                       3
<PAGE>   4
the time or territory or any other restriction contained in this Agreement is an
unenforceable restriction against you, provisions of this Agreement shall not be
rendered void, but shall be deemed amended to apply to such maximum time and
territory and to such maximum extent as such court may judicially determine or
indicate to be enforceable. Alternatively, if any court of competent
jurisdiction finds that any restriction contained in this Agreement is
unenforceable, and such restriction cannot be amended so as to make it
enforceable, such finding shall not effect the enforceability of any of the
other restriction contained herein.

5.      MISCELLANEOUS.

        Any payment required under this Agreement shall be subject to all
requirements of the law with regard to withholding, filing, making of reports
and the like, and the Company shall use its commercially reasonable best efforts
to satisfy promptly all such requirements. No provisions of this Agreement may
be modified, waived or discharged unless such waiver, modification or discharge
is agreed to in a writing signed by both parties. The validity, interpretation,
construction and performance of this Agreement shall be governed by the law of
the State of Delaware.

6.      SUCCESSORS AND ASSIGNMENT.

        This agreement and all of your rights thereunder shall inure to the
benefit of and be enforceable by your personal or legal representatives,
executors, administrators, successors, heirs, distributees, devisees and
legatees. Except as expressly provided in this Agreement, this Agreement is
personal to you and may not be assigned to you. If you should die while any
amounts would still be payable to you hereunder if you had continued to live,
all such amounts, unless otherwise provided herein, shall be paid in accordance
with the terms of this Agreement to your devisee, legatee, or other designee or,
if there be no such designee, to your estate. This Agreement shall be binding
upon any successor to the Company (whether direct or indirect, by purchase,
merger, consolidation or otherwise) to all or substantially all of the business
and/or assets of the Company.

7.      TERM OF AGREEMENT.

        This Agreement shall commence as of the date of this Agreement and shall
terminate on the earliest of (i) three (3) years from the date of this
Agreement, (ii) the termination of your employment by the Company for Cause,
Disability or death; (iii) your termination of employment other than for Good
Reason or (iv) your reaching age 65.

8.      NO GUARANTEE OF CONTINUED EMPLOYMENT.

        This Agreement is intended solely to provide you with certain
compensation and benefits in the event your employment terminates in the
circumstances described in Section 1.1. Nothing in this Agreement constitutes or
implies any specific term of employment. You acknowledge and agree that your
employment with the Company can be terminated by you or the Company at any time
with or without cause or prior warning, as provided in your written offer of
employment dated September 15, 1998. Nothing in this Agreement limits or
supersedes any other agreements between you and the Company concerning
confidentiality or ownership of intellectual property.

9.      MEDIATION.

        In the event that the Company terminates you for Cause and you dispute
its right to do so or you claim that your are entitled to terminate your
employment for Good Reason and the Company disputes your right to do so, a
mediator acceptable to you and the Company will be appointed within ten (10)
days to assist in reaching a mutually satisfactory resolution but will have no
authority to issue a binding decision. Such mediation must be concluded within
60 days of the date of termination or claim to termination. Should such
mediation fail to reach an acceptable conclusion and you are successful in any
litigation or settlement that issues from such dispute, you shall be entitled to
receive from the Company all of the expenses incurred by you in connection with
any such dispute including reasonable attorney's fees.


                                       4
<PAGE>   5
        If this Agreement is acceptable to you, kindly sign and return to the
Company the enclosed copy of this letter.

                                   Sincerely,

                                   SONUS Pharmaceuticals, Inc.



                                   By:  /s/ Steven C. Quay, M.D., Ph.D.



AGREED AND ACCEPTED:

/s/ Gregory Sessler

Gregory Sessler

Dated:  September  16, 1998


                                       5


<PAGE>   1

                                  EXHIBIT 11.1

                           SONUS PHARMACEUTICALS, INC.
                   COMPUTATION OF NET INCOME (LOSS) PER SHARE



<TABLE>
<CAPTION>
                                                       THREE MONTHS ENDED                          NINE MONTHS ENDED
                                                         SEPTEMBER 30,                                SEPTEMBER 30,
                                                ---------------------------------           ---------------------------------
                                                   1998                   1997                 1998                   1997
                                                -----------           -----------           -----------           -----------
<S>                                             <C>                   <C>                   <C>                   <C>        
BASIC EARNINGS PER SHARE:
Net income (loss) .......................       $(2,048,648)          $(1,122,176)          $(8,413,476)          $   639,604

Weighted average common shares ..........         8,626,253             8,573,029             8,619,125             8,553,321

   Basic earnings per share .............       $     (0.24)          $     (0.13)          $     (0.98)          $      0.07

DILUTED EARNINGS PER SHARE:

Net income (loss) .......................       $(2,048,648)          $(1,122,176)          $(8,413,476)          $   639,604

Weighted average common shares - basic ..         8,626,253             8,753,029             8,619,125             8,553,321
Dilutive potential common shares ........                --                    --                    --             1,003,850
                                                -----------           -----------           -----------           -----------
   Total ................................         8,626,253             8,573,029             8,619,125             9,557,171
                                                ===========           ===========           ===========           ===========

   Diluted earnings per share ...........       $     (0.24)          $     (0.13)          $     (0.98)          $      0.07
</TABLE>



                                       12


<TABLE> <S> <C>

<ARTICLE> 5
       
<S>                             <C>
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JUL-01-1998
<PERIOD-END>                               SEP-30-1998
<CASH>                                       6,625,401
<SECURITIES>                                13,690,045
<RECEIVABLES>                                        0
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                            20,646,557
<PP&E>                                       3,873,810
<DEPRECIATION>                               2,353,724
<TOTAL-ASSETS>                              22,166,643
<CURRENT-LIABILITIES>                        9,867,376
<BONDS>                                              0
                                0
                                          0
<COMMON>                                    34,995,061
<OTHER-SE>                                (24,746,548)
<TOTAL-LIABILITY-AND-EQUITY>                22,166,643
<SALES>                                              0
<TOTAL-REVENUES>                             2,700,000
<CGS>                                                0
<TOTAL-COSTS>                                4,910,531
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                            (69,235)
<INCOME-PRETAX>                            (2,048,648)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                        (2,048,648)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                               (2,048,648)
<EPS-PRIMARY>                                   (0.24)
<EPS-DILUTED>                                   (0.24)
        

</TABLE>


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