ABBOTT LABORATORIES
SC 13D, 1996-05-24
PHARMACEUTICAL PREPARATIONS
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<PAGE>
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549

                                 SCHEDULE 13D

                 Under the Securities Exchange Act of 1934
                            (Amendment No.          )*
                                          ---------

                         Sonus Pharmaceuticals, Inc.
           --------------------------------------------------------
                                (Name of Issuer)

                    Common Stock, par value $.001 per share
           --------------------------------------------------------
                          (Title of Class of Securities)

                                   835692104
           --------------------------------------------------------
                                 (CUSIP Number)

           Jose M. de Lasa, Abbott Laboratories, AP6D D-364, 100
           Abbott Park Road, Abbott Park, Illinois 60064-3500
           Tel: (847) 937-8905
           --------------------------------------------------------
           (Name, Address and Telephone Number of Person Authorized
                     to Receive Notices and Communications)

                                 May 14, 1996
           --------------------------------------------------------
            (Date of Event which Requires Filing of this Statement)

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

   Check the following box if a fee is being paid with this statement  /X/.  (A
fee is not required only if the reporting person:  (1) has a previous statement
on file  reporting  beneficial ownership of more than five percent of the class
of securities  described in Item 1;  and  (2) has filed no amendment subsequent
thereto  reporting  beneficial ownership of five percent or less of such class.
(See Rule 13d-7.)

   NOTE:  Six copies of this statement, including all exhibits, should be filed
with the Commission.  See Rule 13d-1(a) for other parties to whom copies are to
be sent.

   *The remainder of  this cover  page  shall  be  filled  out  for a reporting
person's  initial  filing on this  form with  respect to the  subject  class of
securities,  and for any  subsequent  amendment  containing  information  which
would alter disclosures provided in a prior cover page.

   The information  required on the  remainder of this  cover page shall not be
deemed to be "filed"  for the purpose of  Section 18 of the Securities Exchange
Act of 1934  ("Act") or otherwise subject to the liabilities of that section of
the Act but shall be subject to all other  provisions of the Act  (however, see
the Notes).


                        (Continued on following page(s))

                              Page 1 of     Pages
                                        --- 


<PAGE>

CUSIP No. 835692104                   13D                 Page     of     Pages
          ---------                                            ---    --- 

- -------------------------------------------------------------------------------
 (1) Names of Reporting Persons.  S.S. or I.R.S. Identification Nos. of Above
     Persons

Abbott Laboratories IRS Identification Number: 36-0698440
- -------------------------------------------------------------------------------
 (2) Check the Appropriate Box if a Member     (a)  / /
     of a Group*                               (b)  / /
- -------------------------------------------------------------------------------
 (3) SEC Use Only

- -------------------------------------------------------------------------------
 (4) Source of Funds*
     WC
- -------------------------------------------------------------------------------
 (5) Check if Disclosure of Legal Proceedings is Required Pursuant to
     Items 2(d) or 2(e)
- -------------------------------------------------------------------------------
 (6) Citizenship or Place of Organization
     Illinois
- -------------------------------------------------------------------------------
Number of Shares              (7) Sole Voting
 Beneficially Owned                 Power        500,000
 by Each Reporting           --------------------------------------------------
 Person With                  (8) Shared Voting
                                    Power
                             --------------------------------------------------
                              (9) Sole Dispositive
                                    Power        500,000
                             --------------------------------------------------
                             (10) Shared Dispositive
                                    Power
- -------------------------------------------------------------------------------
(11) Aggregate Amount Beneficially Owned by Each Reporting Person
     500,000
- -------------------------------------------------------------------------------
(12) Check if the Aggregate Amount in Row (11) Excludes Certain Shares*
                                                                           / /
- -------------------------------------------------------------------------------
(13) Percent of Class Represented by Amount in Row (11)
     5.58%
- -------------------------------------------------------------------------------
(14) Type of Reporting Person*
     CO
- -------------------------------------------------------------------------------
                    *SEE INSTRUCTION BEFORE FILLING OUT!



<PAGE>


ITEM 1.   SECURITY AND ISSUER. 

          This statement relates to warrants (the "Warrants") for five hundred
thousand (500,000) shares of the common stock (the "Common Stock") of Sonus
Pharmaceuticals, Inc., a Delaware corporation (the "Issuer") whose principal
executive offices are located at 22026 20th Avenue, S.E., Suite 102, Bothell,
Washington 98021.  The Warrants have an exercise price equal to sixteen dollars
($16.00) per share, subject to adjustments as set forth in the Warrant
Certificate, a copy of which is attached hereto and incorporated herein as
EXHIBIT 3. All rights to purchase shares of Common Stock under the Warrant 
Certificate shall cease at 11:59 p.m. on May 14, 2001, subject to earlier 
termination as provided in the Warrant Certificate.  The Warrants are 
evidenced by the Warrant Certificate.
          
ITEM 2.        IDENTITY AND BACKGROUND.   

          (a) - (c), and (f)  The person filing this statement is Abbott
Laboratories ("Abbott"), an Illinois corporation.  Abbott's principal business
is the discovery, development, manufacture, and sale of a broad and diversified
line of health care products and services.  Abbott's principal office is located
at 100 Abbott Park Road, Abbott Park, Illinois 60064-3500.

          The names, citizenship, business addresses, present principal
occupation or employment and the name, and the principal business and address of
any corporation or other organization in which such employment is conducted of
the directors and executive officers of Abbott are as set forth in Annex A
hereto and incorporated herein by this reference.

          (d) and (e)  Neither Abbott, nor to the best of its knowledge, any
person listed on Annex A has during the last five years (i) been convicted in a
criminal proceeding (excluding traffic violations or similar misdemeanors) or
(ii) been a party to a civil proceeding of a judicial or administrative body of
competent jurisdiction and as a result of such proceeding was or is subject to a
judgment, decree or final order enjoining future violations of, or prohibiting
or mandating activities subject to, federal or state securities laws or finding
any violation with respect to such laws.


ITEM 3.   SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.  
          
          The consideration used by Abbott for the acquisition reported in this
Schedule 13D came from the general assets of Abbott.  Abbott acquired the
Warrants for $4,000,000 (i.e., eight dollars per share).

ITEM 4.   PURPOSE OF THE TRANSACTION.   

          Abbott acquired the Warrants contemporaneously and in connection with
its entering into an agreement with the Issuer pursuant to which Abbott and the
Issuer will collaborate in the research, development, marketing, and sale of
EchoGen-Registered Trademark- Emulsion, an ultrasound contrast agent being
investigated for broad clinical utility in both cardiology and radiology
applications. 

                                          3
<PAGE>

          Abbott acquired the Warrants as an investment and is bound by the
terms and conditions of the Agreement between Abbott Laboratories and Sonus
Pharmaceuticals, Inc. dated May 14, 1996 (the "Agreement") (a copy of which is
attached hereto as EXHIBIT 1), the Sonus Pharmaceuticals, Inc. Third Amended and
Restated Registration Rights Agreement entered into as of May 15, 1996 (the
"Registration Agreement") (a copy of which is attached hereto as EXHIBIT 2), and
a Warrant Certificate dated May 14, 1996 (the "Warrant Certificate") (a copy of
which is attached hereto as EXHIBIT 3).  The Agreement, the Registration
Agreement, and the Warrant Certificate are incorporated herein by this reference
and are described in greater detail in Item 6.  

          The Agreement provides that Abbott, with the exception of the shares
it may acquire upon exercise of the Warrant, shall not, without the prior
written consent of the Issuer, acquire or agree to acquire, by purchase or
otherwise, any voting securities of the Issuer or any subsidiary of the Issuer. 
Subject to the terms and conditions of the Agreement, the Registration
Agreement, and the Warrant Certificate; to a continuing review of the prospects
of the Issuer, market conditions, and economic conditions; and, to other
relevant factors, Abbott may purchase shares of Common Stock, or may dispose of
the shares it subsequently acquires.

          (a) In addition to the Warrant, Section 4.1 of the Agreement 
provides that Abbott may also receive a warrant to acquire an additional 
125,000 shares of the Common Stock (the "Section 4.1 Warrant").  Section 4.1 
of the Agreement, states that if the Issuer receives a bona fide offer from a 
Third Party (as defined in the Agreement) for the right to market and sell 
Product (as defined in the Agreement) in Canada and/or Latin America prior to 
December 31, 1996, then within a reasonable time, not to exceed sixty (60) 
days, the Issuer shall give written notice to Abbott of the details of the 
offer and Abbott shall have the opportunity to meet, or offer terms more 
favorable than, such Third Party offer within sixty (60) days of such notice. 
If either (A) Abbott meets or offers terms more favorable than such Third 
Party offer and the Issuer fails to enter into an agreement with Abbott with 
respect to such marketing rights, or (B) whether or not there is a Third 
Party offer, the parties do not enter into a binding commitment for Abbott to 
acquire marketing rights in Canada and/or Latin America prior to December 31, 
1996, then the payment in Appendix 2.3 to the Agreement due to Issuer upon 
the First Shipment Date (as defined therein) shall be decreased.  The Issuer 
may, at its option, substitute for the decreased payment Section 4.1 Warrants 
to purchase 125,000 shares of common stock of the Issuer, subject to 
adjustment as set forth in a warrant certificate substantially in the form of 
the Warrant Certificate, for shares of the Issuer's common stock, such 
Section 4.1 Warrants based on the warrant exercise price equal to the volume 
weighted average price for the ten (10) trading days prior to the date the 
Issuer executes a definitive agreement with a Third Party for marketing 
rights as set forth in Section 4.1 or December 31, 1996, whichever is 
earlier.  The Issuer shall notify Abbott of which option it chooses no later 
than December 31, 1996. The Section 4.1 Warrant shall be issued as of the 
date of the determination of the warrant price. Anything in the foregoing to 
the contrary notwithstanding, in the event that prior to December 31, 1996, 
the Issuer should receive a bona fide offer from a Third Party for marketing 
rights in Canada and/or Latin America and Abbott shall have failed to meet or 
offer more favorable terms as provided above, then the Issuer shall not be 
subject to a reduced fee upon First Shipment or have an obligation to issue 
any Section 4.1 Warrants.

                                          4
<PAGE>

          (b) - (j)  Except to the extent that the license of intellectual
property rights by the Issuer to Abbott pursuant to the Agreement (and the
related agreements referenced in the Agreement) constitutes "a sale or transfer
of a material amount of assets of the issuer or any of its subsidiaries," Abbott
does not now have any plans or proposals which would relate to or result in
transactions of the kind described in paragraphs (b) through (j) of Item 4 of
Schedule 13d of the Securities and Exchange Commission.  Abbott does, however,
reserve the right to adopt such plans or proposals, subject to compliance with
applicable regulatory requirements, if any. 

ITEM 5.   INTEREST IN SECURITIES OF THE ISSUER. 

          (a)  Abbott is the beneficial owner of Warrants entitling it to 
purchase 500,000 shares of the Issuer's Common Stock.  This represents 
approximately five and 58/100 percent (5.58%) of the outstanding shares of 
the Common Stock.  The calculation of the foregoing percentage is based on 
the number of shares of Common Stock shown as being outstanding on the Form 
10-Q Quarterly Report filed by the Issuer with the Securities and Exchange 
Commission for the quarter ended March 31, 1996.  In addition, under Section 
4.1 of the Agreement, Abbott may receive a Section 4.1 Warrant entitling 
Abbott to purchase an additional 125,000 shares of the Issuer's Common Stock. 
The Section 4.1 Warrant is described in greater detail in Item 4(a).
          
          (b)  At such time, if ever, as Abbott exercises the Warrant (or the 
Section 4.1 Warrant) it will have the sole power to vote  or direct the vote 
and the sole power to dispose or direct the disposition of the shares of 
Common Stock acquired upon that exercise.   Section 8.3 of the Agreement 
provides that, with the exception of the shares acquired upon exercise of the 
Warrant, Abbott and its "Affiliates" (as defined in the Agreement) shall not, 
without the prior written consent of the Issuer, acquire or agree to acquire, 
by purchase or otherwise any voting securities of the Issuer or any 
subsidiary of the Issuer.

          (c)  Except as described herein, there have been no transactions by
Abbott or the persons whose names are listed on Annex A in securities of the
Issuer during the past sixty days.

          (d)  No one other than Abbott is known to have the right to receive or
the power to direct the receipt of dividends from, or the proceeds from the a
sale of, the Warrant or the shares of Common Stock that Abbott may acquire upon
exercise of the Warrant. 

          (e)  Not applicable.


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

          Abbott's rights with respect to the securities of the Issuer are
subject to the terms and conditions of the Agreement, the Registration
Agreement, and the Warrant Certificate.  These terms and conditions are
described below.

                                          5
<PAGE>

          Section 8.1 of the Agreement provides that Abbott shall purchase and
the Issuer shall sell and issue the Warrant.


          Section 8.3 of the Agreement provides that with the exception of 
the shares acquired upon exercise of the Warrant, Abbott, shall not, without 
the prior written consent of the Issuer acquire or agree to acquire, by 
purchase or otherwise, any voting securities of the Issuer or any subsidiary 
of the Issuer.

          The Issuer has granted Abbott certain the registration rights under
the Registration Agreement and has amended the Registration Agreement to include
Abbott within that agreement's definition of the term "Holder."

          Section 1 of the Registration Agreement defines the terms 
"Registrable Securities", "Piggyback Registrable Securities", "register", 
"registered", "registration", "Registration Statement", "Initiating Holders" 
and "Piggyback Holders".  The terms "Registrable Securities" and "Piggyback 
Registrable Securities" are defined to include within their definition the 
Common Stock issued or issuable upon exercise of either the Warrant or the 
Section 4.1 Warrant.  The terms "register", "registered", and "registration" 
refer to a registration effected by filing with the Securities and Exchange 
Commission  a registration statement (the "Registration Statement") in 
compliance with the Securities Act of 1933, as amended (the "1933 Act") and 
the declaration or ordering by the  Securities and Exchange Commission  of 
the effectiveness of such Registration Statement.  The term "Initiating 
Holders" means any Holder or Holders of not less than fifty percent (50%) of 
the Registrable Securities held by all of the Holders then outstanding and 
not registered at the time of any request for registration pursuant to 
paragraph 1.2 of the Registration Agreement.  The term "Piggyback Holders" 
means the Holders of Piggyback Registrable Securities.

          Paragraph  1.2(a) of the Registration Agreement provides that if the
Issuer receives from Initiating Holders a written demand (a "Demand
Registration") that the Issuer effect any registration under the 1933 Act of all
or part of the Registrable Securities (other than a registration on Form S-3 or
any related form of registration statement), the Issuer will:

          (i)    promptly (but in any event within 10 days) give written notice
                 of the proposed registration to all other Holders; and

          (ii)   use its best efforts to effect such registration as soon as
                 practicable as may be so demanded and as will permit or
                 facilitate the sale and distribution of all or such portion of
                 such Initiating Holders' Registrable Securities as are
                 specified in such demand, together with all or such portion of
                 the Registrable Securities of any Holder or Holders joining in
                 such demand as are specified in a written demand received by
                 the Issuer within 30 days after such written notice is given,
                 provided that the Issuer shall not be obligated to take any
                 action to effect any such registration, pursuant to paragraph
                 1.2:

                                          6
<PAGE>


          (A)    Within 120 days immediately following the effective date of
                 any registration statement pertaining to an underwritten
                 public offering of securities of the Issuer for its own
                 account (other than a registration on Form S-4 relating solely
                 to a Securities and Exchange Commission Rule 145 transaction,
                 or a registration relating solely to employee benefit plans);

          (B)    After the Issuer has effected an aggregate of two such
                 registrations pursuant to paragraph 1.2 and the sales of the
                 shares of Common Stock under such registrations have closed;

          (C)    If the Issuer shall furnish to such Holders a certificate
                 signed by the President of the Issuer, stating that in the
                 good faith judgment of the board of directors of the Issuer it
                 would be seriously detrimental to the Issuer and its
                 shareholders for such Registration Statement to be filed at
                 the date filing would be required, in which case the Issuer
                 shall have an additional period of not more than 90 days
                 within which to file such Registration Statement; provided,
                 however, that the Issuer shall not use this right more than
                 once in any twelve month period;

          (D)    If the Demand Registration covers less than 30 percent of
                 Registrable Securities held by all of the Holders and the
                 proposed aggregate offering price to the public of the
                 Registrable Securities to be included in the registration by
                 all Holders, is less than $5,000,000; or

          (E)    Prior to October 17, 1996.

       Paragraph 1.2(b) of the Registration Agreement provides that if the 
Initiating Holders intend to distribute the Registrable Securities covered by 
their demand by means of an underwriting, they shall so advise the Issuer as 
part of their demand made pursuant to paragraph 1.2; and the Issuer shall 
include such information in the written notice referred to above.  In such 
event, the right of any Holder to registration pursuant to paragraph 1.2 is 
conditioned upon that Holder's participation in the underwriting and the 
inclusion of that Holder's Registrable Securities in the underwriting (unless 
otherwise mutually agreed by a majority in interest of the Initiating Holders 
and that Holder) to the extent provided in the Registration Agreement.

       Paragraph 1.2(b) of the Registration Agreement also provides that the
Issuer, together with all Holders proposing to distribute their securities
through such underwriting, must enter into an underwriting agreement in
customary form with the underwriter or underwriters selected by a majority in
interest of the Initiating Holders and reasonably satisfactory to the Issuer. 
Notwithstanding any other provision of paragraph 1.2, if the underwriter advises

                                          7
<PAGE>

the Issuer in writing that marketing factors (including an adverse effect on the
per share offering price) require a limitation of the number of shares to be
underwritten, then the Issuer must advise all Holders of Registrable Securities
that would otherwise be so registered and underwritten, and the number of shares
of Registrable Securities that may be included in the registration and
underwriting shall be allocated pro rata among the Holders thereof in
proportion, as nearly as practicable, to the respective amounts of Registrable
Securities held by such Holders at the time of filing the registration
statement.  For purposes of any underwriter cutback, all Registrable Securities
held by any Holder which is a partnership or corporation shall also include any
Registrable Securities held by the partners, retired partners, shareholders or
affiliated entities of such Holder, or the estates and family members of any
such partners and retired partners and any trusts for the benefit of any of the
foregoing persons, and such Holder and other persons shall be deemed to be a
single "selling Holder", and any pro rata reduction with respect to such
"selling Holder" shall be based upon the aggregate amount of shares carrying
registration rights owned by all entities and individuals included in such
"selling Holder", as defined in this sentence.  No Registrable Securities
excluded from the underwriting by reason of the underwriter's marketing
limitation shall be included in such registration.

     If any Holder disapproves of the terms of the underwriting, such Holder may
elect to withdraw therefrom by written notice to the Issuer, the underwriter,
and the Initiating Holders.  The Registrable Securities so withdrawn shall also
be withdrawn from registration.

     If the underwriter has not limited the number of Registrable Securities to
be underwritten, the Issuer may include securities for its own account (or for
the account of other shareholders) in such registration if the underwriter so
agrees and if the number of Registrable Securities that would otherwise have
been included in such registration and underwriting will not thereby be limited.

     Paragraph 1.3(a) of the Registration Agreement provides that if at any time
or from time to time the Issuer shall determine to register any of its
securities, either for its own account or the account of security holders, other
than a registration relating solely to employee benefit plans, a registration on
Form S-4 relating solely to an Securities and Exchange Commission Rule 145
transaction, or a registration pursuant to paragraph 1.2 of the Registrant
Agreement, the Issuer will:

       (i)  promptly give to the Piggyback Holders written notice thereof
            (which shall include a list of the jurisdictions in which the
            Issuer intends to attempt to qualify such securities under the
            applicable blue sky or other state securities laws); and

       (ii) include in such registration (and any related qualification under
            blue sky laws or other compliance), and in any underwriting
            involved therein, all the Piggyback Registrable Securities
            specified in a written request or requests, made within 20 days
            after receipt of such written notice from the Issuer, by the
            Piggyback Holders, except as set forth in subparagraph 1.3(b)
            of the Registration Agreement.

                                          8
<PAGE>

     Paragraph 1.3(b) of the Registration Agreement provides that if the 
registration of which the Issuer gives notice is for a registered public 
offering involving an underwriting, then the Issuer shall so advise the 
Piggyback Holders as a part of the written notice given pursuant to 
subparagraph 1.3(a)(i).  In such event, the right of the Piggyback Holders to 
registration of his or its Piggyback Registrable Securities pursuant to 
paragraph 1.3 shall be conditioned upon the Piggyback Holder's participation 
in such underwriting and the inclusion of the Piggyback Holder's Piggyback 
Registrable Securities in the underwriting to the extent provided in the 
Registration Agreement.  The Piggyback Holders proposing to distribute their 
securities through such underwriting shall, together with the Issuer and the 
other parties distributing their securities through such underwriting, enter 
into an underwriting agreement in customary form with the underwriter or 
underwriters selected for such underwriting by the Issuer. Notwithstanding 
any other provision of paragraph 1.3, if the underwriter determines that 
marketing factors require a limitation of the number of shares to be 
underwritten, the underwriter may limit the number of Piggyback Registrable 
Securities to be included in the registration and underwriting, or may 
exclude Piggyback Registrable Securities entirely from such registration and 
underwriting subject to the terms of this paragraph; provided, however, for 
any registration, the limitation shall not reduce the number of Piggyback 
Registrable Securities to be included in the offering below thirty percent 
(30%) of the total number of shares to be included in the offering unless the 
holders of at least a majority of Piggyback Registrable Securities then 
outstanding otherwise consent to or approve the limitation of the number of 
shares to be underwritten.  The Issuer shall so advise all holders of the 
Issuer's securities that would otherwise be registered and underwritten 
pursuant hereto, and the number of shares of such securities, including 
Piggyback Registrable Securities, that may be included in the registration 
and underwriting shall be allocated in the following manner:  shares, other 
than Piggyback Registrable Securities, requested to be included in such 
registration by shareholders shall be excluded, and if a limitation on the 
number of shares is still required, the number of Piggyback Registrable 
Securities that may be included shall be allocated among the Piggyback 
Holders thereof in proportion, as nearly as practicable, to the respective 
amounts of Piggyback Registrable Securities held by the Piggyback Holders at 
the time of filing the Registration Statement.  For purposes of any 
underwriter cutback, all Piggyback Registrable Securities held by any 
Piggyback Holder which is a partnership or corporation shall also include any 
Piggyback Registrable Securities held by the partners, retired partners, 
shareholders or affiliated entities of such Piggyback Holder or the estates 
and family members of any such partners and retired partners and any trusts 
for the benefit of any of the foregoing persons, and such Piggyback Holder 
and other persons shall be deemed to be a single "selling Holder", and any 
pro rata reduction with respect to such "selling Piggyback Holder" shall be 
based upon the aggregate amount of shares carrying registration rights owned 
by all entities and individuals included in such "selling Piggyback Holder," 
as defined in this sentence.  No securities excluded from the underwriting by 
reason of the underwriter's marketing limitation shall be included in such 
registration.  If any Piggyback Holder disapproves of the terms of the 
underwriting, it may elect to withdraw therefrom by written notice to the 
Issuer and the underwriter.  The Piggyback Registrable Securities so 
withdrawn shall also be withdrawn from registration.

                                          9

<PAGE>

     Paragraph 1.3(c) of the Registration Agreement provides that no Piggyback
Holder shall be entitled to exercise any right provided for in  Section 1.3
after October 17, 1998.

     Paragraph 1.4 of the Registration Agreement provides that all expenses
incurred in connection with the first two registrations effected pursuant to
paragraph 1.2 and all registrations effected pursuant to paragraphs 1.3 and 1.9,
including without limitation all registration, filing, and qualification fees
(including blue sky fees and expenses), printing expenses, escrow fees, fees and
disbursements of counsel for the Issuer and of one special counsel for the
participating Holders and the Common Holders (as defined in the Registration
Agreement), and expenses of any special audits incidental to or required by such
registration, shall be borne by the Issuer; provided, however, that the Issuer
shall not be required to pay stock transfer taxes or underwriters' discounts, or
commissions relating to Registrable Securities or Piggyback Registrable
Securities.  Notwithstanding anything to the contrary above, the Issuer shall
not be required to pay for any expenses of any registration proceeding under
paragraph 1.2 if the registration request is subsequently withdrawn at the
request of the Holders of a majority of the Registrable Securities to have been
registered, unless such Holders agree to forfeit their right to a demand
registration pursuant to paragraph 1.2 (in which event such right shall be
forfeited by all Holders).  In the absence of such an agreement to forfeit, the
Holders of Registrable Securities to have been registered shall bear all such
expenses pro rata on the basis of the Registrable Securities to have been
registered.  Notwithstanding the preceding sentence, however, if at the time of
the withdrawal, the Holders have learned of a material adverse change in the
condition, business, or prospects of the Issuer from that known to the Holders
at the time of their request, of which the Issuer had knowledge at the time of
the request, then the Holders shall not be required to pay any of said expenses
and shall retain their rights pursuant to paragraph 1.2.

       Paragraph 1.5 of the Registration Agreement provides that whenever
required under  Section 1 of the Registration Agreement to effect the
registration of any Registrable Securities or Piggyback Registrable Securities
the Issuer shall, as expeditiously as reasonably possible:

       (a)  Prepare and file with the Securities and Exchange Commission a
            registration statement with respect to such Registrable
            Securities or Piggyback Registrable Securities and use its
            diligent best efforts to cause such registration statement to
            become effective, and keep such registration statement effective
            for up to ninety (90) days or until the Holders and the Common
            Holders have completed the distribution relating thereto.

       (b)  Prepare and file with the Securities and Exchange Commission such
            amendments and supplements to such registration statement and the
            prospectus used in connection with such registration statement as
            may be necessary to comply with the provisions of the 1933 Act with
            respect to the disposition of all securities covered by such
            registration statement.

       (c)  Furnish to the Holders and the Common Holders such numbers of
            copies of a prospectus, including a preliminary prospectus, in
            conformity with the requirements of the 1933 Act, and such other
            documents as they may reasonably request in order to facilitate
            the disposition of Registrable Securities or Piggyback
            Registrable Securities owned by them.

                                          10
<PAGE>

       (d)     Use its best efforts to register and qualify the securities
               covered by such registration statement under such other
               securities or Blue Sky laws of such jurisdictions as shall be
               reasonably requested by the Holders and the Common Holders,
               provided that the Issuer shall not be required in connection
               therewith or as a condition thereto to qualify to do business or
               to file a general consent to service of process in any such
               states or jurisdictions.

       (e)     In the event of any underwritten public offering, enter into and
               perform its obligations under an underwriting agreement, in usual
               and customary form, with the managing underwriter of such
               offering.  Each Holder and each Common Holder participating in
               such underwriting shall also enter into and perform its
               obligations under such an agreement.

       (f)     Notify each holder of Registrable Securities or Piggyback
               Registrable Securities covered by such registration statement at
               any time when a prospectus relating thereto is required to be
               delivered under the 1933 Act of the happening of any event as a
               result of which the prospectus included in such registration
               statement, as then in effect, includes an untrue statement of a
               material fact or omits to state a material fact required to be
               stated therein or necessary to make the statements therein not
               misleading in the light of the circumstances then existing.

       (g)     Furnish, at the request of the Holder or any Common Holder
               requesting registration of Registrable Securities or Piggyback
               Registrable Securities pursuant to  Section 1, on the date that
               such Registrable Securities or Piggyback Registrable Securities
               are delivered to the underwriters for sale in connection with a
               registration pursuant to  Section 1, if such securities are being
               sold through underwriters, on the date that the registration
               statement with respect to such securities becomes effective, (i)
               an opinion, dated such date, of the counsel representing the
               Issuer for the purposes of such registration, in form and
               substance as is customarily given to underwriters in an
               underwritten public offering, addressed to the underwriters, if
               any, and to the Holders and/or the Common Holders requesting
               registration of Registrable Securities or Piggyback Registrable
               Securities, and (ii) a letter dated such date from the
               independent accountants of the Issuer, in form and substance as
               is customarily given by independent accountants to underwriters
               in an underwritten public offering, addressed to the
               underwriters, if any, and, if permissible, to the Holders and/or
               the Common Holders requesting registration of Registrable
               Securities or Piggyback Registrable Securities.

       Paragraph 1.6(a) of the Registration Agreement provides that the Issuer
will indemnify and hold harmless each Holder of Registrable Securities and each
Piggyback Holder of Piggyback Registrable Securities, each of such Holder's or


                                          11
<PAGE>

such Piggyback Holder's, officers, directors, partners and agents, and each
person controlling such Holder or such Piggyback Holders, with respect to any
registration, qualification, or compliance effected pursuant to  Section 1 of
the Registration Agreement, and each underwriter, if any, and each person who
controls any underwriter, of the Registrable Securities held by or issuable to
such Holder or such Piggyback Holder, against all claims, losses, damages, and
liabilities (or actions in respect thereto) to which they may become subject
under the 1933 Act, the Securities Exchange Act of 1934, as amended, (the "1934
Act"), or other federal or state law arising out of or based on (i) any untrue
statement (or alleged untrue statement) of a material fact contained in any
prospectus, offering circular, or other similar document (including any related
Registration Statement, notification, or the like) incident to any such
registration, qualification, or compliance, or based on any omission (or alleged
omission) to state therein a material fact required to be stated therein or
necessary to make the statements therein not misleading, or (ii) any violation
or alleged violation by the Issuer of any federal, state or common law rule or
regulation applicable to the Issuer in connection with any such registration,
qualification, or compliance, and will reimburse, as incurred, each such Holder,
each such Piggyback Holder, each such underwriter, and each such director,
officer, partner, agent and controlling person, for any legal and any other
expenses reasonably incurred in connection with investigating or defending any
such claim, loss, damage, liability, or action; provided that the Issuer will
not be liable in any such case to the extent that any such claim, loss, damage,
liability or expense, arises out of or is based on any untrue statement or
omission based upon written information furnished to the Issuer by an instrument
duly executed by such Holder or such Piggyback Holder or underwriter and stated
to be specifically for use therein.

       Paragraph 1.6(b) of the Registration Agreement provides that each Holder
and each Piggyback Holder will, if Registrable Securities or Piggyback
Registrable Securities held by or issuable to such Holder or such Piggyback
Holder are included in such registration, qualification, or compliance,
severally and not jointly, indemnify the Issuer, each of its directors, and each
officer who signs a Registration Statement in connection therewith, and each
person controlling the Issuer, each underwriter, if any, and, each person who
controls any underwriter, of the Issuer's securities covered by such a
Registration Statement, and each other Holder, each other Piggyback Holder, each
of such other Holder's or Piggyback Holder's officers, partners, directors and
agents and each person controlling such other Holder, or such other Piggyback
Holder against all claims, losses, damages, and liabilities (or actions in
respect thereof) arising out of or based on any untrue statement (or alleged
untrue statement) of a material fact contained in any such Registration
Statement, prospectus, offering circular, or other document, or any omission (or
alleged omission) to state therein a material fact required to be stated therein
or necessary to make the statements therein not misleading, and will reimburse,
as incurred, the Issuer, each such underwriter, each such other Holder, each
such other Piggyback Holder, and each such director, officer, partner, and
controlling person, for any legal or any other expenses reasonably incurred in
connection with investigating or defending any such claim, loss, damage,
liability, or action, in each case to the extent, but only to the extent, that
such untrue statement (or alleged untrue statement) or omission (or alleged
omission) was made in such Registration Statement, prospectus, offering
circular, or other document, in reliance upon and in conformity with written
information furnished to the Issuer by an instrument duly executed by such
Holder or such Piggyback Holder and stated to be specifically for use therein;
provided, however, that the liability of each Holder or each Piggyback Holder
hereunder shall be limited to the net proceeds received by such Holder or such
Piggyback Holder from the sale of securities under such Registration Statement. 
In no event will any Holder or any Piggyback Holder be required to enter into
any agreement or undertaking in connection with any registration under  Section
1 providing for any indemnification or contribution obligations on the part of
such Holder or such Piggyback Holder greater than such Holder's or such
Piggyback Holder's obligations under paragraph 1.6.

                                          12
<PAGE>

       Paragraph 1.6(c) of the Registration Agreement provides that each party
entitled to indemnification under paragraph 1.6 (the "Indemnified Party") shall
give notice to the party required to provide such indemnification (the
"Indemnifying Party") of any claim as to which indemnification may be sought
promptly after such Indemnified Party has actual knowledge thereof, and shall
permit the Indemnifying Party to assume the defense of any such claim or any
litigation resulting therefrom; provided that counsel for the Indemnifying
Party, who shall conduct the defense of such claim or litigation, shall be
subject to approval by the Indemnified Party (whose approval shall not be
unreasonably withheld) and the Indemnified Party may participate in such defense
with its separate counsel at the Indemnifying Party's expense if representation
of such Indemnified Party would be inappropriate due to actual or potential
differing interests between such indemnified party and any other party
represented by such counsel in such proceeding; and provided further that the
failure of any Indemnified Party to give notice as provided herein shall not
relieve the Indemnifying Party of its obligations under  Section 1, except to
the extent that such failure to give notice shall materially adversely affect
the Indemnifying Party in the defense of any such claim or any such litigation. 
No Indemnifying Party, in the defense of any such claim or litigation, shall,
except with the consent of each Indemnified Party, consent to entry of any
judgment or enter into any settlement that does not include as an unconditional
term thereof the giving by the claimant or plaintiff therein, to such
Indemnified Party, of a release from all liability in respect to such claim or
litigation.

          Paragraph 1.7 of the Registration Agreement provides that if the
Holder or any Piggyback Holder of Registrable Securities or Piggyback
Registrable Securities include Registrable Securities or Piggyback Registrable
Securities in any registration, such Holder or Piggyback Holder, shall furnish
to the Issuer such information regarding such Holder or Piggyback Holder
respectively, and the distribution proposed by such Holder or such Piggyback
Holder, respectively, as the Issuer may reasonably request in writing and as
shall be required in connection with any registration, qualification, or
compliance referred to in  Section 1.

       Paragraph 1.8 of the Registration Agreement provides that the rights 
of the Holders and the Piggyback Holders contained in paragraphs 1.2, 1.3 and 
1.9 of the Registration Agreement, to cause the Issuer to register the 
Registrable Securities or Piggyback Registrable Securities, may be assigned 
or otherwise conveyed to a transferee or assignee of Registrable Securities 
or Piggyback Registrable Securities, who shall be considered a "Holder" or a 
"Piggyback Holder", as applicable, for purposes of  Section 1; provided that 
such transferee or assignee, (a) receives such securities as a partner in 
connection with partnership distributions of a Series A Purchaser (as defined 
in the Registration Agreement) or a Piggyback Holder, or (b) acquires at 
least 200,000 shares (as presently constituted), or 100% of the Registrable 
Securities or Piggyback Registrable Securities held by the transferring 
Holder or Piggyback Holder, whichever is less; and, provided further, that 
the Issuer is given written notice by such Holder or Piggyback Holder at the 
time of or within a reasonable time after said transfer stating the name and 
address of said transferee or assignee and identifying the securities with 
respect to which such registration rights are being assigned.

                                          13
<PAGE>

       Paragraph 1.9 of the Registration Agreement provides that the Issuer
shall use its best efforts to qualify for registration on Form S-3 and to that
end the Issuer shall register (whether or not required by law to do so) its
Common Stock under the 1934 Act within twelve (12) months following the
effective date of the first registration of any securities of the Issuer on Form
S-1.  After the Issuer has qualified for the use of Form S-3, the Holders of
Registrable Securities shall have the right to request up to four (4)
registrations on Form S-3 under  paragraph 1.9.  The Issuer shall give notice to
all Holders of Registrable Securities of the receipt of a request for
registration pursuant to  paragraph 1.9 and shall provide a reasonable
opportunity for other Holders to participate in the registration.  Subject to
the foregoing, the Issuer will use its best efforts to effect promptly the
registration of all shares of Registrable Securities on Form S-3, as the case
may be, to the extent requested by the Holder or Holders thereof for purposes of
disposition; provided, however, that the Issuer shall not be obligated to effect
any such registration (i) if the Holders, together with the holders of any other
securities of the Issuer entitled to inclusion in such registration, propose to
sell Registrable Securities and such other securities (if any) at an aggregate
price to the public of less than $1,000,000, or (ii) more than once during any
twelve (12) month period; or (iii) in the event that the conditions set forth in
subparagraph 1.2(a)(ii)(C) obtain (but subject to the limitations set forth
therein).

       Paragraph 1.10 of the Registration Agreement provides that no Holder,
nor any Piggyback Holder shall have any right to obtain or seek an injunction
restraining or otherwise delaying any such registration as the result of any
controversy that might arise with respect to the interpretation or
implementation of Section 1.

       Paragraph 1.11 of the Registration Agreement provides that from and 
after the date of the Registration Agreement, the Issuer shall not, without 
the prior written consent of the holders of more than a majority of the 
Piggyback Registrable Securities, enter into any agreement with any holder or 
prospective holder of any securities of the Issuer which would allow such 
holder or prospective holder to (a) require the Issuer to effect a 
registration or (b) include any securities in any registration filed under 
paragraph 1.2 or 1.3 of the Registration Agreement, unless, under the terms of 
such agreement, such holder or prospective holder may include such securities 
in any such registration only to the extent that the inclusion of such 
securities will not diminish the amount of Registrable Securities or 
Piggyback Registrable Securities which are included in such registration and 
includes the equivalent of Section 1.13 as a term.

       Paragraph 1.12 of the Registration Agreement provides that with a view
to making available to the Holders and the Piggyback Holders the benefits of
certain rules and regulations of the Securities and Exchange Commission which
may permit the sale of the Registrable Securities and the Piggyback Registrable
Securities to the public without registration, the Issuer agrees to use its best
efforts to:

                                          14
<PAGE>

       (a)     Make and keep public information available, as those terms are
               understood and defined in Securities and Exchange Commission Rule
               144 or any similar or analogous rule promulgated under the 1933
               Act, at all times commencing ninety (90) days after the effective
               date of the first registration filed by the Issuer for an
               offering of its securities to the general public;

       (b)     File with the Securities and Exchange Commission, in a timely
               manner, all reports and other documents required of the Issuer
               under the 1933 Act and 1934 Act;

       (c)     So long as any Holder or any Piggyback Holder owns any
               Registrable Securities or Piggyback Registrable Securities,
               furnish to such Holder or such Piggyback Holder forthwith upon
               request:  a written statement by the Issuer as to its compliance
               with the reporting requirements of said Rule 144 of the 1933 Act,
               and of the 1934 Act (at any time after it has become subject to
               such reporting requirements); a copy of the most recent annual or
               quarterly report of the Issuer; and such other reports and
               documents as any Holder or any Piggyback Holder may reasonably
               request in availing itself of any rule or regulation of the
               Securities and Exchange Commission allowing it to sell any such
               securities without registration.

       Paragraph 1.13 of the Registration Agreement provides that each Holder
and each Piggyback Holder agrees that during the 120-day period following
the effective date of a registration statement of the Issuer filed under the
1933 Act, he or it shall not, to the extent requested by the Issuer and any
underwriter, sell or otherwise transfer or dispose of (other than to donees who
agree to be similarly bound) any Common Stock of the Issuer held by him or it at
any time during such period except Common Stock included in such registration;
provided, however, that:

       (a)     such agreement shall be applicable only to the first such
               registration statement of the Issuer which covers Common Stock
               (or other securities) to be sold on his or its behalf to the
               public in an underwritten offering; and

       (b)     all officers and directors of the Issuer and all other persons
               with registration rights (whether or not pursuant to this
               Agreement) enter into similar agreements.

     In order to enforce the foregoing covenant, the Issuer may impose
stop-transfer instructions with respect to the Registrable Securities and/or
Piggyback Registrable Securities of each Holder and each Piggyback Holder (and
the shares or securities of every other person subject to the foregoing
restriction) until the end of such period.

                                          15
<PAGE>

       Paragraph 1.14 of the Registration Agreement provides that any provision
of  Section 1 may be amended and the observance thereof may be waived (either
generally or in a particular instance and either retroactively or prospectively)
only with the written consent of the Issuer and the holders of not less than a
majority of the Piggyback Registrable Securities then outstanding.  Any
amendment or waiver effected in accordance with this paragraph shall be binding
upon each Holder, each Piggyback Holder, each future holder of Registrable
Securities or Piggyback Registrable Securities, and the Issuer.

          The Warrant Certificate provides that Abbott is the owner of 
500,000 Warrants, each of which entitles the Abbott  or registered assigns 
(the "Holder") to purchase one fully paid and nonassessable share of Common 
Stock of the Issuer (such number being subject to adjustment as provided in 
Paragraph 5 of the Warrant Certificate) on the terms and conditions set forth 
in the Warrant Certificate. 

          The purchase price of the shares of Common Stock covered by the
Warrants is  $16.00 per share, subject to adjustment as provided in Paragraph 5
of the Warrant Certificate.  The purchase price of the shares of Common Stock as
to which the Warrants are exercised must be paid in full at the time of exercise
and may be paid by cash, check or bank draft.

          The term of the Warrants commenced on the May 14, 1996 and all 
rights to purchase shares of Common Stock under the Warrant Certificate shall 
cease at 11:59 P.M. on May 14, 2001, subject to earlier termination as 
provided in the Warrant Certificate.  The Warrants may be exercised at any 
time from May 14, 1996 until their expiration.  The Warrant Certificate also 
provides that the Holder of the Warrants shall not have any of the rights of 
a stockholder with respect to the shares covered by the Warrants as to any 
shares of Common Stock that are not actually issued and delivered to it.

          The Warrants are not transferable or assignable except to an 
Affiliate of the Holder without the prior written consent of the Issuer, 
which consent shall not be unreasonably withheld.  The Holder may transfer or 
assign the shares of Common Stock issuable upon exercise of the Warrants; 
provided, however, that (i) a registration statement with respect thereto has 
become effective under the 1933 Act; or (ii) in the opinion of counsel to the 
Holder such registration is not necessary; or (iii) such transfer complies 
with the provisions of Rule 144 under the 1933 Act.  For purposes of the 
Warrant Certificate, "Affiliate" means any wholly-owned subsidiary or parent 
of, or any corporation, entity or other person which is, within the meaning 
of the 1933 Act, controlling, controlled by or under common control with, the 
Holder or the Issuer, as the case may be.

          Section 5 of the Warrant Certificate describes the circumstances 
under which there will be adjustments for stock splits, consolidations, 
etcetera.  It provides that the purchase price and number and class of shares 
subject to the Warrant Certificate shall all be proportionately adjusted in 
the event of any change or increase or decrease in the number of issued 
shares of Common Stock in the Issuer, without receipt of consideration by the 
Issuer, which result from a split-up or consolidation of shares, payment of a 
share dividend, a recapitalization, combination of shares or other like 
capital adjustment, so that, upon exercise of the Warrant Certificate, the 
Holder shall receive the number and class of shares it would have received 
had it been the holder of the number of shares of Common Stock in the Issuer, 
for which the Warrant Certificate is being exercised, on the date of such 
change or increase or decrease in the number of issued shares of Common Stock 
in the Issuer.  If the Issuer reorganizes, consolidates or merges with or 
into any other corporation where the Issuer is not the surviving entity, then 
each share of Common Stock shall be convertible into the consideration to 
which the shares of Common Stock subject to the Warrant Certificate would 
have been entitled to receive upon the effectiveness of such reorganization, 
merger or consolidation.  Adjustments under Section 5 shall be made by the 
Board of Directors of the Issuer in its reasonable, good faith judgment, 
whose determination with respect thereto shall be final and conclusive.  No 
fractional shares shall be issued under the Warrant Certificate or upon any 
such adjustment.

                                          16
<PAGE>

          Section 6 of the Warrant Certificate describes the method by which 
the Warrant may be exercised.  Paragraph 6(a) provides that, subject to the 
terms and conditions of the Warrant Certificate, the Warrants may be 
exercised by surrender of the Warrant Certificate together with delivery to 
the Issuer at its principal office of a signed Subscription Agreement (the 
"Subscription Agreement") specifying the number of shares to be purchased.  
The Subscription Agreement shall be accompanied by payment in cash, check or 
bank draft, payable to the Issuer, equal to, in the aggregate, the full 
purchase price of the shares.  The Issuer shall deliver a certificate or 
certificates representing the shares subject to such exercise as soon as 
practicable after the Subscription Agreement and consideration for the shares 
has been received by the Issuer, and the Holder shall be deemed a record 
holder of Common Stock upon such receipt by the Issuer. 

          Paragraph 6(b) provides that the Holder shall have the right, upon 
its written request delivered or transmitted to the Issuer together with the 
Warrant Certificate, to exchange the Warrant Certificate, in whole or in part 
at any time or from time to time on or prior to May 14, 2001, for the number 
of shares of Common Stock having an aggregate Fair Market Value (determined 
as set forth in Paragraph 6(c) below) on the date of such exchange equal to 
the difference between (1) the aggregate Fair Market Value on the date of the 
exchange of a number of shares designated by the Holder and (2) the aggregate 
exercise price the Holder would have paid to the Issuer to purchase the 
designated number of shares upon exercise of the Warrant Certificate.  Upon 
any such exchange, the number of shares purchasable upon exercise of the 
Warrant Certificate shall be reduced by the designated number of shares, and, 
if a balance of purchasable shares remains after that exchange, the Issuer 
shall execute and deliver to the Holder a new Warrant Certificate evidencing 
the right of the Holder to purchase such balance of shares.  No payment of any 
cash or other consideration shall be required.  The exchange shall be 
effective upon the date of receipt by the Issuer of the original Warrant 
Certificate surrendered for cancellation and a written request from the 
Holder that the exchange pursuant to this Section be made, or at such later 
date as may be specified in such request.

          Paragraph 6(c) provides that the fair market value of the Common Stock
("Fair Market Value") shall be determined as follows:

          (i)  If the Common Stock is listed on a national securities exchange
               or admitted to unlisted trading privileges on such an exchange,
               or is listed on the Nasdaq National Market or Small Cap Market,
               the current Fair Market Value shall be the volume-weighted
               average price of the Common Stock on such exchange or Nasdaq for
               the ten (10) business days prior to the date of exchange of the
               Warrant; or

                                          17
<PAGE>

         (ii)  If the Common Stock is not so listed or admitted to unlisted
               trading privileges or quoted on Nasdaq, the current Fair Market
               Value shall be the volume-weighted average of the mean of the
               last bid and asked prices reported for the ten (10) business days
               prior to the date of the exchange of the Warrant (1) by Nasdaq,
               or (2) if reports are unavailable under clause (i) above, by the
               National Quotation Bureau Incorporated; or

        (iii)  If the Common Stock is not so listed or admitted to unlisted
               trading privileges and bid and asked prices are not so
               reported, the current Fair Market Value shall be determined
               in good faith as promptly as reasonably practicable by the
               Board of Directors.



ITEM 7.   MATERIAL TO BE FILED AS EXHIBITS.

          Annex A -      Information Concerning Executive Officers and 
                         Directors of Abbott Laboratories.

          Exhibit 1 -    Agreement between Abbott Laboratories and Sonus
                         Pharmaceuticals, Inc. dated May 14, 1996. 
                         (Confidential Treatment requested for portions of this
                         Agreement.)

          Exhibit 2 -    Amended Registration Rights Agreement.
     
          Exhibit 3 -    Warrant Certificate.


               *******************************

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

                                   Abbott Laboratories

DATED: May 23, 1996        By:    Duane L. Burnham
                                -----------------------------------------
                                Duane L. Burnham, Chairman of the Board
                                     and Chief Executive Officer

                                          18
<PAGE>

                                     Annex A

                  Information Concerning Executive Officers and
                        Directors of Abbott Laboratories
                         _______________________________

          The current corporate officers and directors of Abbott Laboratories
     are listed below.  The address of Abbott Laboratories is:  Abbott
     Laboratories, 100 Abbott Park Road, Abbott Park, Illinois 60064-3500. 
     Abbott Laboratories does not consider all of its corporate officers to be
     executive officers as defined by the Securities Exchange Act of 1934 or
     Releases thereunder.  Unless otherwise indicated, all positions set forth
     below opposite an individual's name refer to positions within Abbott
     Laboratories, and the business address listed for each individual not
     principally employed by Abbott Laboratories is also the address of the
     corporation or other organization which principally employs that
     individual.


                           POSITION/PRESENT PRINCIPAL
                           OCCUPATION OR EMPLOYMENT
 NAME                      AND BUSINESS ADDRESS                  CITIZENSHIP

 Corporate Officers
 ------------------

 Duane  L. Burnham (1)     Chairman of the Board and             U. S. A.
                           Chief Executive Officer

 Thomas R. Hodgson (1)     President and Chief Operating         U. S. A.
                           Officer

 Joy A. Amundson (1)       Senior Vice President,                U. S. A.
                           Chemical & Agricultural Products

 Paul N. Clark (1)         Senior Vice President,                U. S. A.
                           Pharmaceutical Operations

 Gary P. Coughlan (1)      Senior Vice President, Finance        U. S. A.
                           & Chief Financial Officer

 Jose M. de Lasa (1)       Senior Vice President,                U. S. A.
                           Secretary and General Counsel

 John G. Kringel (1)       Senior Vice President,                U. S. A.
                           Hospital Products

 Thomas M. McNally (1)     Senior Vice President, Ross Products  U. S. A.

 David V. Milligan,        Senior Vice President, Chief          U. S. A.
  Ph.D. (1)                Scientific Officer

 Robert L. Parkinson,      Senior Vice President,                U. S. A.
  Jr. (1)                  International Operations

 Ellen M. Walvoord (1)     Senior Vice President, Human          U. S. A.
                           Resources

 Miles D. White (1)        Senior Vice President,                U. S. A.
                           Diagnostic Operations

                                          19
<PAGE>

                                    Annex A

                           POSITION/PRESENT PRINCIPAL
                           OCCUPATION OR EMPLOYMENT
 NAME                      AND BUSINESS ADDRESS                  CITIZENSHIP

 Catherine V.              Vice President, Investor Relations    U. S. A.
  Babington (1)            and Public Affairs

 Mark E. Barmak            Vice President, Litigation and        U. S. A.
                           Government Affairs

 Christopher B. Begley     Vice President, Hospital              U. S. A.
                           Products Business Sector

 Thomas D. Brown           Vice President, Diagnostic            U. S. A.
                           Commercial Operations

 Gary R. Byers (1)         Vice President, Internal Audit        U. S. A.

 Kenneth W. Farmer (1)     Vice President, Management            U. S. A.
                           Information Services & Administration

 Thomas C. Freyman (1)     Vice President and Treasurer          U. S. A.

 David B. Goffredo         Vice President, Pharmaceutical        U. S. A.
                           Products Marketing & Sales

 Rick A. Gonzalez (1)      Vice President, HealthSystems         U. S. A.

 Jay B. Johnston           Vice President, Diagnostic            U. S. A.
                           Assays and Operations

 James J. Koziarz, Ph.D.   Vice President, Diagnostic            U. S. A.
                           Products Research & Development

 John F. Lussen (1)        Vice President, Taxes                 U. S. A.

 Richard H. Morehead (1)   Vice President, Corporate             U. S. A.
                           Planning and Development

 Theodore A. Olson (1)     Vice President and Controller         U. S. A.

 Andre G. Pernet           Vice President, Pharmaceutical        U. S. A.
                           Products Research & Development

 Carl A. Spalding          Vice President, Ross Pediatric        U. S. A.
                           Products

 William H. Stadtlander    Vice President, Ross Medical          U. S. A.
                           Nutritional Products

                                          20
<PAGE>

                                    Annex A

                           POSITION/PRESENT PRINCIPAL
                           OCCUPATION OR EMPLOYMENT
 NAME                      AND BUSINESS ADDRESS                  CITIZENSHIP

 Josef Wendler             Vice President, European Operations   Germany

 Don G. Wright (1)         Vice President, Corporate Quality     U. S. A.
                           Assurance & Regulatory Affairs

 Lance B. Wyatt (1)        Vice President, Corporate             U. S. A.
                           Engineering

 Directors
 ---------

 K.  Frank Austen, M.D.    Professor of Medicine,                U. S. A.
                           Harvard Medical School
                              The Seeley G. Mudd Building,
                              Room 604
                              250 Longwood Avenue
                              Boston, Massachusetts 02115

 Duane L. Burnham          Officer of Abbott                     U. S. A.

 H. Laurance Fuller        Chairman, President, and Chief        U. S. A.
                           Executive Officer
                              Amoco Corporation 
                              200 East Randolph Drive
                              Mail Code 3000
                              Chicago, Illinois 60601
                              (integrated petroleum and 
                              chemicals company)

 Thomas R. Hodgson         Officer of Abbott                     U. S. A.

 Allen F. Jacobson         Retired Chairman and Chief Executive  U. S. A.
                           Officer, Minnesota Mining &
                           Manufacturing Company
                              3050 Minnesota World Trade Center
                              30 E. 7th Street
                              St. Paul, Minnesota 55101-4901
                              (manufacturer of industrial imaging
                              and health care products)

                                          21
<PAGE>


                                  Annex A

                Information Concerning Executive Officers and 
                       Directors of Abbott Laboratories
                    _____________________________________

                            POSITION/PRESENT PRINCIPAL
                            OCCUPATION OR EMPLOYMENT
 NAME                       AND BUSINESS ADDRESS                CITIZENSHIP

 David A. Jones             Chairman and Chief Executive        U. S. A.
                            Officer 
                              Humana Inc.
                              500 W. Main St.
                              Humana Building
                              Louisville, Kentucky 40201
                              (health plan business)

 The Rt. Hon. the 
  Lord Owen CH              British Member of Parliament        United Kingdom
                              20 Queen Anne's Gate
                              Westminster, London
                              SW1H 9AA, England

 Boone Powell, Jr.          President and Chief Executive       U. S. A.
                            Officer
                              Baylor Health Care System and
                              Baylor University Medical Center,
                              Vice President, Baylor University
                              3500 Gaston Avenue
                              Dallas, Texas 75246

 Addison Barry Rand         Executive Vice President            U. S. A.
                            Xerox Corporation
                              800 Long Ridge Road
                              Stamford, Connecticut
                              06904-1600
                              (document processing, insurance 
                              and financial services company)

 Dr. W. Ann Reynolds       Chancellor                           U. S. A.
                              The City University of New York
                              535 E. 80th Street
                              New York, New York 10021

 William D. Smithburg      Chairman, President and Chief        U. S. A.
                           Executive Officer
                              The Quaker Oats Company
                              321 N. Clark Street
                              Chicago, Illinois 60610
                              (worldwide food manufacturer
                              and marketer of beverages
                              and grain-based products)

                                          22
<PAGE>



                                  Annex A

                Information Concerning Executive Officers and 
                       Directors of Abbott Laboratories
                    _____________________________________

                            POSITION/PRESENT PRINCIPAL
                            OCCUPATION OR EMPLOYMENT
 NAME                       AND BUSINESS ADDRESS                CITIZENSHIP

 John R. Walter            Chairman and Chief Executive         U. S. A.
                           Officer
                              R. R. Donnelley & Sons Company
                              R. R. Donnelley Building
                              77 West Wacker Drive
                              Chicago, Illinois 60601 
                              (printing company)

 William L. Weiss          Chairman Emeritus, Ameritech         U. S. A.
                           Corporation
                              One First National Plaza
                              Suite 2530C
                              Chicago, Illinois 60603-2006
                              (telecommunications company)


(1) Pursuant to Item 401(b) of Regulation S-K Abbott has identified these 
    persons as "executive officers" within the meaning of Item 401(b).

                                        23


<PAGE>

                                    AGREEMENT

                                     BETWEEN

                               ABBOTT LABORATORIES

                                       AND

                           SONUS PHARMACEUTICALS, INC.








                         [Confidential Treatment Requested]



<PAGE>

                                TABLE OF CONTENTS
                               ABBOTT LABORATORIES
                                       AND
                           SONUS PHARMACEUTICALS, INC.


 1.  DEFINITIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   2

 2.  RESEARCH AND DEVELOPMENT  . . . . . . . . . . . . . . . . . . . . . . .   6

 3.  ALLOCATION OF PRODUCT RIGHTS AND RESPONSIBILITIES . . . . . . . . . . .   9

 4.  CANADA AND LATIN AMERICA. . . . . . . . . . . . . . . . . . . . . . . .  24

 5.  LICENSES  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  26

 6.  LAUNCH BUDGET; REIMBURSEMENT PAYMENTS . . . . . . . . . . . . . . . . . .27

 7.  REVENUE PAYMENTS  . . . . . . . . . . . . . . . . . . . . . . . . . . .  29

 8.  WARRANT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  31

 9.  BUYOUT OPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  32

10.  RIGHT OF FIRST REFUSAL FOR ADDITIONAL PRODUCTS  . . . . . . . . . . . .  33

11.  REPRESENTATIONS  AND WARRANTIES . . . . . . . . . . . . . . . . . . . .  34

12.  TERM AND TERMINATION  . . . . . . . . . . . . . . . . . . . . . . . . .  35

13.  INDEMNIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . .  40

14.  LIMITATION OF LIABILITY . . . . . . . . . . . . . . . . . . . . . . . .  42

15.  CONFIDENTIAL INFORMATION  . . . . . . . . . . . . . . . . . . . . . . .  42

16.  NON-COMPETE   . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  43

17.  FORCE MAJEURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  43

18.  NOTICES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  44

19.  ASSIGNMENT  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  45

20.  SUCCESSORS AND ASSIGNS  . . . . . . . . . . . . . . . . . . . . . . . .  46

<PAGE>

21.  ALTERNATIVE DISPUTE RESOLUTION  . . . . . . . . . . . . . . . . . . . .  46

22.  PUBLICITY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  46

23.  RELATIONSHIP OF PARTIES . . . . . . . . . . . . . . . . . . . . . . . .  47

24.  APPENDICES AND EXHIBITS . . . . . . . . . . . . . . . . . . . . . . . .  47

25.  HEADINGS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  48

26.  WAIVER  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  48

27.  SEVERABILITY  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  48

28.  ENTIRE AGREEMENT; AMENDMENT . . . . . . . . . . . . . . . . . . . . . .  48

29.  APPLICABLE LAW  . . . . . . . . . . . . . . . . . . . . . . . . . . . .  49

30.  COUNTERPARTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  49

<PAGE>

                                   APPENDICES


INDICATIONS                                       Appendix 1.6

LICENSED PATENTS                                  Appendix 1.13

RESEARCH AND DEVELOPMENT PLAN                     Appendix 2.2

R&D PAYMENT SCHEDULE                              Appendix 2.3

NET SALES FORECAST                                Appendix 3.2B

SPECIFICATIONS                                    Appendix 3.4

TRADEMARKS                                        Appendix 3.9

ALTERNATIVE DISPUTE RESOLUTION                    Appendix 21




                                    EXHIBITS


WARRANT CERTIFICATE FORM                          Exhibit A


[THE APPENDICES LISTED ABOVE,
 OTHER THAN APPENDIX 2.3,
 ARE NOT INCLUDED HEREWITH
 BUT WILL BE FURNISHED
 SUPPLEMENTALLY TO THE COMMISSION
 UPON REQUEST, SUBJECT
 TO ABBOTT LABORATORIES' RIGHT
 TO REQUEST CONFIDENTIAL
 TREATMENT FOR THESE APPENDICES PURSUANT
 TO THE RULES OF THE COMMISSION]

<PAGE>

                                    AGREEMENT


     THIS AGREEMENT dated May 14, 1996 ("Effective Date"), by and between Abbott
Laboratories, an Illinois corporation with principal offices at 100  Abbott Park
Road, Abbott Park, Illinois 60064-3500 ("ABBOTT") and SONUS Pharmaceuticals,
Inc., a Delaware corporation with principal offices at 22026 20th Avenue, S.E.,
Suite 102, Bothell, Washington 98021 ("SONUS").

                                    RECITALS

     WHEREAS, SONUS has developed and holds patents and patent applications on
an ultrasound contrast agent, trademarked "EchoGen;" and

     WHEREAS, SONUS and ABBOTT have previously entered into a Development and
Supply Agreement, dated May 6, 1993 ("Supply Agreement"), whereby ABBOTT
assisted in the manufacturing scale-up of and agreed to manufacture the
ultrasound contrast agent for SONUS; and

     WHEREAS, SONUS is currently conducting clinical studies for use in
obtaining Federal Food and Drug Administration approval of the ultrasound
contrast agent; and

     WHEREAS, SONUS desires to grant, and ABBOTT desires to obtain, certain
exclusive marketing rights, subject to limited SONUS co-promotion rights, to the
ultrasound contrast agent in accordance with the terms and conditions of this
Agreement;

     NOW, THEREFORE, in consideration of the premises and the mutual promises
and covenants set forth below, ABBOTT and SONUS mutually agree as follows:


                                        1

<PAGE>

1.  DEFINITIONS
     In addition to the terms defined in the provisions of the Agreement, the
following terms shall have the meaning ascribed below:

     1.1  "Affiliate" means any entity which controls, is controlled by or is
under common control with another entity.  An entity is deemed to be in control
of another entity (controlled entity) if the former owns directly or indirectly
at least the lesser of (a) fifty percent (50%), or (b) the maximum percentage
allowed by law in the country of the controlled entity, of the outstanding
voting equity of the controlled entity.

     1.2  "Agreement" means this Agreement, as may be amended, including all
Appendices and Exhibits attached hereto.

     1.3  "Average Unit Selling Price" means Net Sales for a period divided by
the number of Units of Product shipped by ABBOTT and its Affiliates in the
Territory for the same period, less returned goods, inventory outdates, recalls
and/or withdrawals of Product.

     1.4  "Confidential Information" means information disclosed in writing by
one party to the other pursuant to this Agreement and identified as
"CONFIDENTIAL" as well as information disclosed orally to the extent such oral
disclosure is reduced to writing and is identified as "CONFIDENTIAL" and which
is provided to the other party within thirty (30) days after oral disclosure.
"Confidential Information" does not include any of such information which:

          (A)  is known to the receiving party before receipt thereof under this
Agreement, or is independently developed by the receiving party without recourse
to


                                        2

<PAGE>

the other party's Confidential Information, as evidenced by the receiving
party's written  records;

          (B)  is disclosed to the receiving party without restriction after
full execution of this Agreement by a Third Party having a legal right to make
such  disclosure; or

          (C)  is or becomes part of the public domain through no breach of this
Agreement.

     1.5  "FDA"  means the United States Food and Drug Administration or any
successor entity thereto.

     1.6  "Field" means diagnostic ultrasound pharmaceuticals for all current
and future markets for the indications set forth in Appendix 1.6, as such
indications are approved by the FDA.

     1.7  "Finished Goods Inventory" means the Product inventory status whereby
the Product has completed production and testing procedures and is ready for
sale to Third Party customers.

     1.8  "Finished Product" means Units of the Product tested and ready for
sale, either supplied to ABBOTT by SONUS, or manufactured by ABBOTT for SONUS.

     1.9  "First Shipment Date" means the date of the first shipment of Product
by ABBOTT to a Third Party, as evidenced by an ABBOTT sales invoice generated
and sent to a Third Party, but in no event more than ninety (90) days after FDA
approval of the Product.

     1.10  "GMP" means current good manufacturing practices as established by
the FDA and as practiced by the industry in which the parties operate.


                                        3

<PAGE>

     1.11  "Improvements" means any and all developments, inventions or
discoveries in the Field relating to the Licensed Patents or Know-How and
developed, or acquired  with the right to sublicense, by SONUS during the term
of this Agreement and shall  include, but not be limited to, developments
intended to enhance the safety and  efficacy of the Product.

     1.12  "Know-How" means that proprietary technology of SONUS relating to the
Product including, but not limited to, manufacture  or product techniques,
formulations or production technology, methods of synthesis or  other processes.

     1.13  "Licensed Patents" means:

          (A) the patents and patent applications set forth in Appendix 1.13 and
any patents or patent applications covering the Product now owned or hereafter
acquired by SONUS or under which SONUS has the right to grant sublicenses during
the term of this Agreement in the Territory including any covering Improvements;

          (B)  all patents arising from such applications identified in (A) and
any divisions, continuations, and continuations-in-part identified in (A);

          (C)  any extension, renewal,  re-examination or reissue of a patent
identified in (A) or (B).

     1.14  "NDA" means an application filed with the FDA for approval by the FDA
of the sale of the Product in the United States of America, whether such
application is characterized as a New Drug Application or otherwise.

     1.15  "Net Sales" means the gross sales of the Product in all of its final
packaged  forms shipped by ABBOTT and its Affiliates in the Territory,  less:

          (A)  allowances and adjustments separately and actually credited or


                                        4

<PAGE>

payable, including credit for damaged, outdated and returned products;

          (B)  trade  discounts earned or granted;

          (C)  cash discounts actually allowed;

          (D)  transportation  charges (including insurance costs), handling
charges, sales taxes, excise taxes and  duties, and other similar charges
invoiced to customers;

          (E) wholesaler chargebacks; and

          (F)  rebates and management fees earned or granted.

     Net Sales shall be calculated in accordance with ABBOTT's standard internal
policies and procedures.  Any discount, allowance, rebate, management fee or
wholesaler chargeback for the Product which is given to a customer due to the
purchase of a product other than the Product or due to the purchase of any
service, shall not be taken into consideration for the calculation of Net Sales.

     1.16  "Product"  means a colloidal dispersion ultrasound contrast agent
suitable  for intravenous administration containing the active ingredient
dodecafluoropentane which is covered by one or more claims of the Licensed
Patents regardless of form, dose or package.  Without limiting the generality of
the foregoing, "Product" shall include: (i) a complete product with kit,
including one or more vials of EchoGen-Registered Trademark- together with a kit
including a syringe, tubing and other accessories as may be included in the
final package; (ii) one or more vials of EchoGen-Registered Trademark- without
any kit; and (iii) a kit only, consisting of a syringe, tubing and other
accessories as are included in the final package, but not including any EchoGen-
Registered Trademark-.

     1.17  "Supply Agreement" means the Contrast Agent Development and Supply


                                        5

<PAGE>

Agreement between ABBOTT and SONUS dated May 6, 1993, as amended and as may be
amended by the parties.

     1.18  "Territory" means the continental United States, Alaska, Hawaii and
Puerto Rico, but does not include its other territories, commonwealths or
possessions.

     1.19  "Third Party" means any individual, corporation, partnership, trust
or other  business organization or entity, and any other recognized organization
other than the  parties hereto and their Affiliates.

     1.20 "Unit" means a single vial of the Product or a combination of a single
vial with a kit which is in final salable form.

2.  RESEARCH AND DEVELOPMENT

     2.1  RESPONSIBILITIES.  SONUS shall use reasonable commercial best efforts
to carry out and perform the research and development to obtain prompt FDA
approval of  the Product for use in the Field.   SONUS shall be solely
responsible for all research  and development, for clinical research, and for
the securing of regulatory approval of  the Product in the Territory.  SONUS
shall use its reasonable commercial best efforts to achieve each milestone of
the Plan (as defined below) and complete each phase of the research and
development in order to obtain FDA approval of  the Product for marketing in the
Territory.

     2.2  RESEARCH AND DEVELOPMENT PLAN.  SONUS shall be responsible for
preparing a research and  development plan to include all the necessary
research, development, clinical research  and regulatory filings  to support an
NDA and obtain FDA approval of the Product in the Territory.  The research and
development plan and milestone timetable shall be attached to this Agreement as
Appendix 2.2 ("Plan").



                                        6

<PAGE>

Such Plan shall be updated quarterly by SONUS and SONUS  shall submit to ABBOTT
a quarterly status report summarizing the completion or phase  of completion of
each key milestone in the Plan.   During the period of time covered by  the
Plan, ABBOTT and SONUS shall meet at least quarterly  at times and  places
mutually agreed upon to discuss the status of the Plan.

     2.3  RESEARCH AND DEVELOPMENT PAYMENTS.  ABBOTT shall provide to SONUS (A)
thirty million dollars ($30,000,000) to support completion of the Plan,
including any related  general needs by SONUS, and (B) one million dollars
($1,000,000) as payment for the grant of the licenses under  the Licensed
Patents and Know-How  in Article 5 and the trademark license in Section 3.9.
These payments shall  be nonrefundable, shall be paid by ABBOTT to SONUS in the
amounts and at the times set forth on the schedule in Appendix 2.3.  The
quarterly milestone payments set forth in Appendix 2.3 shall be paid to SONUS
within fifteen (15) days of receipt of the appropriate quarterly report
described above in Section 2.2.

     2.4  ADDITIONAL CLINICAL RESEARCH.  ABBOTT shall have no obligation to 
provide financial support for research and development, including clinical 
research, to be conducted by SONUS except for the amounts payable by ABBOTT 
as set forth in Section 2.3 and Article 7.  SONUS shall promptly notify 
ABBOTT in writing if SONUS desires that ABBOTT fund expenditures for clinical 
research in addition to that set forth in the Plan to support research and 
development for ultrasound diagnostic applications for the following 
indications for the Product::   [CONFIDENTIAL PORTION].   Such notice from 
SONUS shall include a budget for clinical research and a preliminary

                                        7

<PAGE>

clinical plan. ABBOTT shall communicate its decision whether or not to
financially participate in such clinical research within ninety (90) days of
receipt of the budget and clinical plan from SONUS.  ABBOTT shall be under no
obligation to financially support such additional clinical research.  If ABBOTT
desires to participate in such additional clinical research, ABBOTT shall
reimburse SONUS for its documented incremental costs and expenses incurred
associated with the additional clinical research which are costs and expenses in
excess of SONUS' budget for clinical research as described in Sections 2.2 and
3.6 and which are mutually agreed by the parties.  In addition, the definition
of the "Field" set forth in Section 1.6 shall be expanded to include the
indication(s) funded by ABBOTT.  SONUS shall reimburse ABBOTT fifty percent
(50%) of such costs and expenses funded by ABBOTT by either, at the option of
SONUS (i) reimbursing ABBOTT such costs and expenses with interest  at the prime
rate of interest  within five (5) years of the date such costs and expenses are
paid by ABBOTT, or (ii) reducing the percentage amounts payable by ABBOTT to
SONUS as provided in Article 7 at such dates and in such amounts as is mutually
agreed by the parties.  If ABBOTT determines not to provide additional financial
support for such additional clinical research and SONUS proceeds with the
additional research and development, then the parties shall negotiate in good
faith to modify the percentage allocations of Revenue Payments allocable to such
additional indications under Section 7.1 below to reflect the amount of the
expenditures to be made by SONUS for such additional clinical research related
to such additional indications, together with such other factors as are
appropriate.  If the parties agree to a reasonable modification of the
percentage allocation of Revenue Payments as set forth above, the definition of


                                        8

<PAGE>

"Field" set forth in Section 1.6 shall be expanded to include such additional
indications.  The provisions of this Section 2.4 shall apply only with respect
to the new indications for the Product specified above and shall not apply to
any new product which is subject to Section 10 below.

     2.5  FDA APPROVAL.  If SONUS does not receive FDA approval to market the
Product within four (4) years of the date of the NDA filing, then ABBOTT may,
but does not have any obligation to,  pursue such FDA approval of the Product.
If ABBOTT determines to pursue FDA approval, then SONUS shall promptly, upon
written request from ABBOTT, deliver to ABBOTT all NDA documentation, clinical
study data and supplies.  ABBOTT may conduct any necessary research or clinical
studies to obtain such FDA approval of the Product.  All reasonable costs
incurred by ABBOTT in pursuing such FDA approval  shall be deducted from any
payments due SONUS under this Agreement.

3.  ALLOCATION OF PRODUCT RIGHTS AND RESPONSIBILITIES

     3.1  PREMISE .  Under this Article 3, ABBOTT and SONUS agree to a division
of responsibilities regarding the Product and, under Article 7, accordingly
agree to a division of revenue generated by sales of the Product.  If there is a
material change in the division of such responsibilities, whether by the
agreement of the parties or by operation of this Agreement, then the parties
shall negotiate in good faith toward a corresponding change in the division of
revenue under Article 7.

     3.2  MARKETING AND SALES.

          (A)  ABBOTT shall have the exclusive right and the associated
responsibilities for the marketing and sales of the Product in the Territory,
which shall


                                        9

<PAGE>

include responsibility for distribution, order entry, invoicing and  collection
regarding sales of the Product.  ABBOTT shall use its reasonable  commercial
best efforts to optimize sales, profitability, and market share in the
Territory.   The efforts of ABBOTT   shall be evidenced by carrying out those
specific tasks as mutually agreed to by the parties.   ABBOTT shall prepare pre-
and post-launch marketing plans which shall be reviewed and approved by SONUS
prior to  implementation, such approval not to be unreasonably withheld.

          (B)  SONUS shall have the right to co-promote (as defined herein) the
Product at its own expense in the Territory only under the following
circumstances:

               (i) at any time after the first anniversary of the First Shipment
Date, if ABBOTT's Net Sales to Third Parties are below fifty percent (50%) of
the mutually agreed Net Sales forecast attached as Appendix 3.2B for any two
consecutive  quarters. SONUS shall notify ABBOTT in writing within  thirty (30)
days of receipt of the applicable second quarterly Net Sales report, as set
forth in Section 7.1, of its  intention to co-promote the Product.  SONUS' right
to co-promote would be effective thirty (30) days after the date of ABBOTT's
receipt of notice from SONUS.  If SONUS does not so  inform ABBOTT, then SONUS
shall have waived its right to co-promote the  Product with regard to that
specific failure of ABBOTT to meet its Net Sales forecast for such two (2)
consecutive quarters.  The Net Sales forecast shall be adjusted as mutually
agreed by the parties to reflect the actual time that FDA approval is obtained
and the actual indications approved.

               (ii)  at any time after the third anniversary of the First
Shipment Date, SONUS may, at its expense, co-promote and sell the Product in the
Territory in


                                       10

<PAGE>

order to increase sales, profitability and market share above the existing Net
Sales forecast, for new indications, market segment customers, or customer
locations in a manner  designed as complementary to ABBOTT's sales and marketing
efforts.  All SONUS deployment and promotional plans and budgets must be
reviewed and approved by ABBOTT prior to implementation, such approval not to be
unreasonably withheld.  SONUS shall  notify ABBOTT in writing ninety (90) days
prior to commencing such co-promotion  of the Product.

               (iii) at any time for new indications or new market segments for
which ABBOTT has declined to support research, development or clinical research
after timely notice by SONUS as set forth in Section 2.4.

          (C)  SONUS' rights to co-promote the Product as set forth in
subsections 3.2(B) (i), (ii), and (iii) do not include the right of SONUS to
sublicense,  transfer, or grant, directly or indirectly, such rights to a Third
Party except as set forth in Article 19.  For purposes of this Agreement, "co-
promotion" means the detailing of the Product to a Third Party customer
including providing promotional materials and technical assistance but does not
include accepting sales orders.  SONUS shall inform all such customers to place
all sales resulting from SONUS' co-promotion of the Product directly with ABBOTT
and provide the necessary sales processing information to the customer.

     3.3  RAW MATERIALS, QUALITY CONTROL.  SONUS  shall be responsible for
procurement of all raw materials necessary for the manufacture of the Product as
well as quality control of the raw materials.  SONUS shall handle raw materials
in accordance with the applicable  provisions of the Supply Agreement.


                                       11

<PAGE>

     3.4  PRODUCT MANUFACTURE.

          (A) ABBOTT and SONUS have previously entered into the Supply Agreement
under which ABBOTT has agreed to  manufacture the Product for SONUS.  SONUS may
purchase Product under the Supply Agreement to fulfill ABBOTT's purchase orders
under Section 3.5.  All manufacturing of the Product by ABBOTT for sale in the
Territory by ABBOTT shall be in accordance with the terms of the Supply
Agreement and the specifications for the Product in effect under the Supply
Agreement ("Specifications") attached hereto as Appendix 3.4.   The parties
agree to negotiate in good faith an amendment to the Supply Agreement to include
within the terms of the Supply Agreement the purchase and sale of the kits
consisting of syringes, tubing and other accessories as are included in the
final package of the complete Product, including the pricing and other terms and
conditions of sale which are consistent with the Supply Agreement and the
general custom and practice within the industry regarding such materials.

     (B) The Supply Agreement shall govern ABBOTT's manufacture of all Product
provided to SONUS for sale by SONUS outside the Territory and SONUS' right to
manufacture or have manufactured the Product by a Third Party.   SONUS shall
give ABBOTT reasonable prior notice in writing if SONUS decides to manufacture
or have manufactured by a Third Party the Product  for purchase by ABBOTT under
this Agreement.  Upon such notice, ABBOTT and SONUS shall enter into good faith
negotiations to reach agreement on the terms and conditions for a Third Party
manufacturer for the Product to be purchased by ABBOTT.

     (C) All Product manufactured by SONUS or by a Third Party shall conform
with


                                       12

<PAGE>

the Specifications.  Any Third Party manufacturer appointed by SONUS to
manufacture the Product must be approved by the FDA and have a reasonable
history and record of conforming with current GMP.

     (D)  If any of the provisions of the Supply Agreement and this Agreement
are inconsistent, then the provisions of this  Agreement shall control for
purposes of the manufacture and supply of Product subject to this  Agreement.

     3.5  PRODUCT FORECASTS, ORDERS AND REJECTED PRODUCT.  (A) Not later than
one hundred twenty (120) days prior to the First Shipment Date, and thereafter,
at least thirty (30) days prior to the first day of each calendar quarter,
ABBOTT shall furnish to SONUS a rolling forecast of the quantities of the
Product ABBOTT intends to order for sale in the Territory during the twelve (12)
month period commencing with that calendar quarter.  The first three (3) months
of such forecast shall constitute a firm order and a binding commitment of
ABBOTT to purchase such quantities as evidenced by purchase orders received from
ABBOTT in accordance with Section 3.5(B).  The balance of each such forecast
shall merely represent reasonable estimates, not purchase commitments for the
Product.

     (B)  ABBOTT shall place each purchase order with SONUS for Product to be
delivered hereunder thirty (30) days prior to the delivery date specified in
each respective purchase order.  SONUS may reject any purchase order which
exceeds one hundred fifty percent (150%) of the most current forecast underlying
such purchase order.  No rejection shall be effective unless in writing and
delivered to ABBOTT within ten (10) days of SONUS' receipt of ABBOTT's purchase
order.  ABBOTT shall be obligated to purchase all Product ordered and delivered
by the


                                       13

<PAGE>

specified delivery date provided that, if Product is manufactured by a Third
Party manufacturer and not by ABBOTT, such Product meets the Specifications.

     (C)  If the Product is manufactured solely by SONUS or a Third Party and if
SONUS is unable to meet its supply obligations under any purchase order, then
SONUS shall give prompt written notice to ABBOTT.  In such event, if SONUS
fails, or notifies ABBOTT  that it will fail, to supply any amount of Product
for a ninety (90) day period, then ABBOTT may (i) set up a manufacturing source,
at the reasonable expense of SONUS, and manufacture or have the Product
manufactured by a Third Party at the reasonable expense of SONUS for the time
period of such failure or one hundred eighty (180) days, whichever is longer, or
(ii) terminate this Agreement in accordance with Section 12.2(D).  The rights of
ABBOTT to terminate the Agreement pursuant to this Section 3.5(C) will not apply
if ABBOTT is in default of the Supply Agreement, unless ABBOTT's default or
inability to supply is directly or indirectly due to SONUS, including, but not
limited to, SONUS' failure to supply raw materials to ABBOTT as required under
the Supply Agreement and this Agreement.

     (D)    If the Product is manufactured solely by ABBOTT and if ABBOTT is
unable to meet its supply obligations under any purchase order, then ABBOTT
shall give prompt written notice to SONUS.  In such event, if ABBOTT fails, or
notifies SONUS that it will fail, to supply any amount of Product for a ninety
(90) day period, then SONUS may (i) set up a manufacturing source, at the
reasonable expense of ABBOTT, and manufacture or have the Product manufactured,
by a Third Party at the reasonable expense of ABBOTT for the time period of such
failure or one hundred eighty (180) days, whichever is longer, or (ii) terminate
this Agreement in accordance



                                       14

<PAGE>

with Section 12.2(D).  Notwithstanding the foregoing, SONUS shall not have the
right to terminate this Agreement if the cause of ABBOTT's inability to supply
is directly or indirectly due to SONUS, including, but not limited to, SONUS'
failure to supply raw materials to ABBOTT as required under the Supply Agreement
and this Agreement.

     (E)  If SONUS and ABBOTT are both manufacturing or otherwise supplying
Finished Product to ABBOTT for sale in the Territory and either ABBOTT or SONUS
("Non-Performing Party") notifies the other party ("Other Party") that the Non-
Performing Party is unable to supply Product to the Other Party or either fails
to supply Product pursuant to this Section 3.5, and is unable to correct such
failure within ninety (90) days of written notice thereof from the Other Party,
then the right of Non-Performing Party to manufacture or otherwise supply
Product to the Other Party under the Supply Agreement shall cease until such
time as the Non-Performing Party notifies the other that it is again able to
supply Product.

     (F)  For Product provided by SONUS to ABBOTT which SONUS has sourced from a
party other than ABBOTT, ABBOTT shall notify SONUS in writing of any claim
relating to damaged, defective or nonconforming Product or any shortage in
quantity of any shipment of Product within thirty (30) days of receipt of such
Product by ABBOTT.  In the event of such rejection or shortage, SONUS shall
replace the rejected Product or make up the shortage within thirty (30) days of
receiving such notice, at no additional cost to ABBOTT, and shall make
arrangements with ABBOTT for the return of any rejected Product at the expense
of SONUS.  For Products provided by SONUS to ABBOTT which SONUS has sourced from
ABBOTT, ABBOTT shall accept such Products as conforming upon delivery to ABBOTT.


                                       15

<PAGE>

     (G)    In the event that SONUS is unable to provide raw material under the
Supply Agreement for a period of ninety (90) days or longer, then ABBOTT shall
have the right to purchase the raw materials from a Third Party at SONUS'
expense or manufacture the raw materials or have a Third Party manufacture the
raw materials at SONUS' expense.

     3.6 CLINICAL RESEARCH, REGULATORY AFFAIRS, TECHNICAL MARKETING/MEDICAL
SUPPORT.

     (A) SONUS shall be responsible for all ongoing product development,
clinical research and regulatory filings and affairs beyond the responsibilities
set forth in Section 2.3 in support of expanded label indications in the Field.
SONUS shall also be responsible for all FDA communications, including review of
promotional materials, and all FDA requirements regarding the Product (except
those communications and requirements specifically associated with GMP
applicable to the manufacture of the Product by ABBOTT as addressed in the
Supply Agreement).  ABBOTT will forward all adverse drug events to SONUS for
handling by SONUS, including any required reporting to the FDA.  Each party
shall promptly notify the other party of all communications from and to the FDA
regarding the Product.

     (B)  SONUS shall be responsible for all medical and technical support in
the Field in the Territory, including those specific tasks mutually agreed to by
the parties.   This support shall be designed to fit with the Product
positioning and ABBOTT's promotional plan.

     3.7  PRODUCT RECALLS.  In the event (A) any government authority issues a
request, directive or order that the Product be recalled, or (B) a court of
competent jurisdiction orders such a recall, or (C) ABBOTT and SONUS, after
consultation with


                                       16

<PAGE>

each other, determine that the Product should be recalled, the parties shall
take all appropriate corrective actions, and shall cooperate in the
investigations surrounding the recall.  ABBOTT     shall handle notification of
customers and return of Product from customers.  SONUS shall handle all FDA
communications and requests regarding any recalls.  If such recall results from
any cause or event arising from a sole responsibility of SONUS as set forth in
this Agreement or in the Supply Agreement or is solely attributable to SONUS,
SONUS shall be responsible for all expenses of the recall and ABBOTT may deduct
any such expenses borne by ABBOTT from any payment due to SONUS under this
Agreement.  If such recall results from a sole responsibility of ABBOTT as set
forth in this Agreement or in the Supply Agreement or is solely attributable to
ABBOTT, ABBOTT shall be responsible for the expenses of recall and shall
reimburse SONUS for expenses incurred by SONUS for such recall.  In the event
that the recall results from any cause(s) or event(s) arising from a joint
responsibility of the parties or partially from a responsibility of SONUS and
partially from a responsibility of ABBOTT, SONUS and ABBOTT shall be jointly
responsible for expenses of the recall in proportion to each such party's
proximate fault with respect to the recall.  For the purpose of this Agreement,
the expenses of recall shall include, without limitation, the expenses of
notification and destruction or return of the recalled Product, cost for the
Product recalled, legal expenses, inventory write-offs and penalties resulting
from third party contracts.

     3.8  PATENTS

          (A) SONUS shall be responsible for and shall  diligently carry out and
shall bear all costs (including attorney fees) for the preparation, filing,
prosecution,


                                       17

<PAGE>

maintenance, and extensions, if any, of all patents or patent applications
under the Licensed Patents.  In addition, SONUS shall promptly advise ABBOTT of
all  material correspondence, filings and notices of action between SONUS and
the United States  Patent and Trademark Office ("PTO") concerning the Licensed
Patents.  If SONUS  elects not to prepare and file a patent application covering
an Improvement referenced under Section 3.8(B) or discontinues the prosecution
of any patent application or maintenance of any patent under  the Licensed
Patents, then SONUS shall promptly notify ABBOTT and supply ABBOTT  with copies
of all written communications with the PTO.  In the event that ABBOTT reasonably
determines that the failure of SONUS to pursue the filing and prosecution of the
patent application would adversely affect the rights of ABBOTT under this
Agreement, ABBOTT may, but  does not have the obligation to, file or continue
prosecution of such application or  maintain such patent at its own expense.
If ABBOTT so elects, then SONUS shall be responsible for the reasonable costs
incurred by ABBOTT in connection with such filing or prosecution and shall
promptly reimburse ABBOTT for such costs upon notice by ABBOTT.

          (B)  SONUS shall promptly notify ABBOTT of any Improvements and of any
efforts by SONUS to patent Improvements in the Territory including, but not
limited to designation of the countries in which any patent application in
respect thereof is to be filed.   Any patent application in respect of such
Improvement and any patent issued therefrom shall become part of the Licensed
Patents and Appendix 1.13 shall be modified to reflect the addition to Licensed
Patents.  If any Improvement is not patented, it shall become part of the Know-
How.

          (C) If either ABBOTT or SONUS has knowledge of any infringement or


                                       18

<PAGE>

likely infringement of a Licensed Patent or unauthorized use of Know-How in the
Territory, then the party having such knowledge shall promptly inform the other
party in writing, and the parties shall promptly consult with one another
regarding the action to be taken.  Unless the parties otherwise mutually agree,
SONUS shall prosecute such suit, and each party shall cooperate with the other
party in the prosecution thereof and SONUS shall have the right to determine the
strategy of the prosecution of such suit.  Notwithstanding the foregoing, if
ABBOTT is participating in the prosecution, ABBOTT  shall be entitled to have
input in the strategy of prosecution.  SONUS shall have the right to determine
the counsel to be retained by the parties in connection with such action or
claim, which counsel shall be reasonably satisfactory to ABBOTT.  SONUS may seek
the assistance and participation of ABBOTT in the action or claim.  If SONUS
requests ABBOTT's participation, (i) ABBOTT shall participate in the prosecution
if the action or claim involves an infringement by a Third Party's product, or
potential product, which substantially falls within the definition of Product in
Section 1.16, and (ii) ABBOTT may participate if ABBOTT determines that it would
be in ABBOTT's interests to participate if the action or claim does not directly
involve an infringement by a Third Party's product, or potential product, which
substantially falls within the definition of Product in Section 1.16.
Notwithstanding the foregoing, in the event that the action or claim involves an
infringement by a Third Party's product, or potential product, which
substantially falls within the definition of Product in Section 1.16, ABBOTT
shall have the right to participate, on an equal basis with SONUS,  in the
prosecution of such action or claim.  If SONUS prosecutes such claim without the
participation of ABBOTT, the costs and expenses incurred in connection with such


                                       19

<PAGE>

action or claim shall be borne by SONUS.  However, if Abbott participates in the
action or claim, the costs and expenses incurred in connection with such action
or claim shall be shared equally by SONUS and ABBOTT.  If ABBOTT does not
participate in the prosecution of the action or claim, or unless otherwise
provided in this Section 3.8(C), any offer of settlement and any settlement
shall be in SONUS' discretion, provided that any offer of settlement or
settlement does not conflict with licenses granted under Article 5.  If ABBOTT
participates in the prosecution of the action or claim and/or if the action or
claim involves an infringement by a Third Party's product, or potential product,
which substantially falls within the definition of Product in Section 1.16, any
offer of settlement and any settlement shall be subject to the prior approval of
both ABBOTT and SONUS.   Each party agrees not to unreasonably withhold its
approval of any such settlement.  If ABBOTT does not participate in the
prosecution of the action or claim, any recovery of damages or other payments
received in connection with such action or claim shall be realized by SONUS.
However, any recovery of damages or other payments received in connection with
such action for which ABBOTT participates in the prosecution shall be allocated
between and disbursed to ABBOTT and SONUS as follows:  (i) first, to reimburse
ABBOTT and SONUS for their respective  costs and expenses incurred in connection
with such action, and (ii) the balance of recovery or other payments to be
divided equally between ABBOTT and SONUS.  In the event that the recovery of
damages is not sufficient to cover costs and expenses incurred by the parties in
connection with such action, each party shall be reimbursed on a pro rata basis
according to each party's percentage of the total costs and expenses incurred by
the parties together.   ABBOTT may, but does not have the obligation to,
participate in


                                       20

<PAGE>

the prosecution of any infringement action outside the Territory.  However, if
ABBOTT does participate in any action and prosecution outside the Territory,
ABBOTT shall be entitled to share in the proceeds or recovery of damages or
other payments received in connection with such action outside the Territory.
Such amounts shall be allocated between and disbursed to ABBOTT and SONUS as
follows:   (i) first, to reimburse ABBOTT for ABBOTT's costs and expenses
incurred in connection with such action, (ii) second, to reimburse SONUS for
SONUS' costs and expenses incurred in connection with such action, and (iii) the
balance of recovery or other payments to be divided equally between ABBOTT and
SONUS.

          (D)  If a claim or suit is brought against ABBOTT alleging:  (i)
infringement of any patent or unauthorized use of any Know-How owned by a Third
Party by reason of ABBOTT's exercise of its licenses hereunder; or  (ii)  an
interest in any patent under the Licensed Patents, ABBOTT shall  promptly give
written notice to SONUS.  SONUS, within a reasonable time after such notice,
but not longer than sixty (60) days, shall advise ABBOTT of SONUS' decision on
the intended disposition of such claim or suit.  If SONUS elects not to dispose
of the claim or defend  the suit, ABBOTT may do so.  The parties will furnish
each other with reasonable  assistance regarding such claim or suit as may be
requested by the other party.  Any offer of settlement or settlement of the
claim or suit by one party shall have the prior written approval of the other
party, such approval not to be unreasonably withheld.  ABBOTT shall have the
right to settle such claim or suit by payment in any form.  If any  amounts are
paid or payable to a Third Party by ABBOTT or any damages and/or costs are
awarded against ABBOTT in such suit, then at the time of payment, such amounts,


                                       21

<PAGE>

damages and costs may be offset against any Revenue Payment due in such year
or, if necessary, in succeeding years to SONUS.

     3.9 TRADEMARKS

          (A)  GRANT OF LICENSE.  SONUS hereby grants to ABBOTT a non-exclusive
license (the "Trademark License") in the Territory to use the SONUS trademark(s)
set forth in Appendix 3.9 on all labels, advertisements, promotional materials
and literature for the Product.

          (B) RESERVATION OF RIGHTS.  SONUS expressly reserves the right to use
and license Third Parties to use the SONUS trademark(s) in a manner not
inconsistent with this Agreement.

          (C) ACKNOWLEDGEMENT.  ABBOTT acknowledges that the SONUS trademark(s)
are owned exclusively by SONUS and that ABBOTT has no right, title or interest
in and to the SONUS trademark(s), except the rights conferred by this Agreement
and that all goodwill associated with the SONUS trademark(s) inures to the
benefit of SONUS.

          (D) REGISTRATION.  SONUS agrees to maintain the SONUS trademark(s) in
the United States at its own expense including the preparation and recordation
of registered user agreements and/or licenses necessary or reasonably deemed
necessary by ABBOTT in order to comply with local laws.

          (E) USE OF TRADEMARK(S).  The Products shall bear the trademark
EchoGen-Registered Trademark- or such other trademarks as mutually agreed to by
the parties.  ABBOTT shall at all times properly use the SONUS trademark(s) to
indicate brand names by using the SONUS trademark(s) in conjunction with the
common name for the Product,


                                       22

<PAGE>

e.g. "ECHOGEN-Registered Trademark- emulsion." However, in written copy or
package inserts ABBOTT may display, where appropriate, the symbol and common
name at the first or most prominent reference to the trademark.  The trademark
registration symbol "-Registered Trademark-" or "-TM-" shall be used to indicate
registration status.  Wherever the SONUS trademark(s) are used, attribution
shall be given to SONUS Pharmaceuticals, Inc. as the owner of the SONUS
trademark(s) at least once per publication as used in the public domain.

          (F) INFRINGEMENTS.  ABBOTT shall promptly call to the attention of
SONUS the use by any Third Party of the SONUS trademark(s) or any trademark
similar to the mark covered by this Agreement, of which it may become aware and
which it may consider to be an infringement or passing off of the SONUS
trademark(s) or unfair competition.  SONUS shall have the right to decide
whether or not to bring proceedings against Third Parties.  Such proceedings
shall be at the expense of SONUS.  ABBOTT shall cooperate fully with SONUS to
whatever extent is deemed reasonably necessary by SONUS to prosecute such
action.  In the event that SONUS recovers damages from prosecution of such
action, SONUS shall retain amounts received for such damages except that ABBOTT
shall be entitled to reimbursement of its costs, expenses, and attorneys' fees
attributable to such action.  SONUS shall not settle or compromise any suit for
infringement without the express approval of ABBOTT, such approval not to be
unreasonably withheld.  In the event SONUS decides not to prosecute, and ABBOTT
reasonably determines that the failure to prosecute would adversely affect the
rights of ABBOTT under this Agreement, ABBOTT shall have the right, but not the
obligation, to prosecute such action at its own expense.   SONUS shall cooperate
fully with ABBOTT to whatever extent is deemed reasonably


                                       23

<PAGE>

necessary by ABBOTT to prosecute such action.  In the event that ABBOTT recovers
damages from prosecution of such action, ABBOTT shall retain amounts received
for such damages except that SONUS shall be entitled to reimbursement of its
costs, expenses, and attorneys' fees attributable to such action.  ABBOTT shall
not settle or compromise any suit for infringement without the express approval
of SONUS.

          (G) TERM.  The initial term of this Trademark License shall be the
Term specified in Article 12 of this Agreement.  Upon expiration of such Term,
ABBOTT shall have a right to renew the Trademark License at a mutually agreeable
reasonable royalty rate.

          (H) TERMINATION.  Upon termination of this Agreement, ABBOTT shall
discontinue all use of the SONUS trademark(s) and shall not thereafter adopt a
mark which is confusingly similar.

          (I) COPIES.  Within ten (10) days after the Effective Date, SONUS
shall provide ABBOTT photocopies of its applicable trademarks
applications/registrations in the Territory.

4.  CANADA AND LATIN AMERICA AND OTHER TERRITORIES.

     4.1 CANADA AND LATIN AMERICA.  If SONUS receives a bona fide offer from a
Third  Party for the right to market and sell the Product in Canada and/or Latin
America  prior to December 31, 1996, then within a reasonable time, not to
exceed sixty (60) days, SONUS shall give written notice to ABBOTT of the details
of the offer and  ABBOTT shall have the opportunity to meet, or offer terms more
favorable than, such Third Party offer within  sixty (60) days of such notice.
If either (A) ABBOTT meets or offers terms more favorable than  such Third Party
offer and SONUS fails to enter into an


                                       24

<PAGE>

agreement with ABBOTT with respect to such  marketing rights, or (B) whether 
or not there is a Third Party offer, the parties do not enter into a binding 
commitment  for ABBOTT to acquire marketing rights in Canada and/or Latin 
America prior to December 31, 1996,  then  the  payment in Appendix 2.3 due 
to SONUS upon First Shipment Date shall be decreased by [CONFIDENTIAL PORTION].
SONUS may, at its option, substitute for the decreased payment warrants to 
purchase 125,000 shares of common stock of SONUS, subject to adjustment as 
set forth in the Warrant  evidenced by a warrant certificate substantially in 
the form of Exhibit A ("Warrant") for shares of SONUS common stock, such 
Warrant based on the warrant exercise price equal to the volume weighted 
average price for the ten (10) trading days prior to the date SONUS executes 
a definitive agreement with a Third Party for marketing rights as set forth 
in this provision or December 31, 1996, whichever is earlier.  SONUS shall 
notify ABBOTT of which option it chooses no later than December 31, 1996.  
The warrant shall be issued as of the date of the determination of the 
warrant price as set forth above.  Anything in the foregoing to the contrary 
notwithstanding, in the event that prior to December 31, 1996, SONUS should 
receive a bona fide offer from a Third Party for marketing rights in Canada 
and/or Latin America and ABBOTT shall have failed to meet or offer more 
favorable terms as provided above, then SONUS shall not be subject to a 
reduced fee upon First Shipment or have an obligation to issue any warrants 
as provided herein.  For purposes of this Agreement, Latin America shall 
include South America, Central America, Mexico, and the Caribbean (including 
possessions or territories of the United States, France, the United Kingdom 
and the Netherlands).

                                       25

<PAGE>

     4.2 OTHER TERRITORIES.   If SONUS receives a bona fide offer from a Third
Party for the right to market and sell the Product in areas or countries other
than the Territory, Canada, Latin America or areas or countries which are
covered by the Agreement dated March 31, 1995 between SONUS and Daiichi
Pharmaceuticals, Ltd. or the Agreement dated October 27, 1994 between SONUS and
Guerbet S.A. (collectively, the "Prior Agreements"), then within a reasonable
time, not to exceed sixty (60) days, SONUS shall give written notice to ABBOTT
of the details of the offer and  ABBOTT shall have the opportunity to meet, or
offer terms more favorable than, such Third Party offer within  sixty (60) days
of such notice.  If ABBOTT meets or offers terms more favorable to SONUS, ABBOTT
and SONUS shall negotiate and enter into an agreement on such terms together
with such other terms as are substantially the same terms of this Agreement for
such areas or countries.  Furthermore, in the event that any areas or countries
covered under a Prior Agreement are no longer covered under a Prior Agreement,
SONUS shall within sixty (60) days notify ABBOTT and facilitate discussions with
ABBOTT regarding ABBOTT acquiring marketing rights for the Products in such
areas or countries.

     4.3 CO-PROMOTION.  ABBOTT and SONUS agree to consider and discuss, and if
requested by ABBOTT, SONUS shall introduce the concept with the parties
contracting with SONUS under the Prior Agreements to consider and discuss,
opportunities for ABBOTT to co-promote the Product in areas or countries covered
by the Prior Agreements.

5.  LICENSES

          (A)  SONUS hereby grants to ABBOTT a royalty-free exclusive license,


                                       26

<PAGE>

exclusive even as to SONUS, with the  right to sublicense, under the Licensed
Patents and Know-How to use, offer to sell and sell the Product in the Field in
the Territory subject to SONUS' co-promotion rights pursuant to Section 3.2(B).
The right to sublicense to a Third Party shall be subject to the approval of
SONUS, such approval not to be unreasonably withheld.

          (B)  SONUS hereby grants to ABBOTT a royalty-free nonexclusive
license, with the right to sublicense, under the Licensed Patents and Know-How
to make, have made, and import the Product for the Field in the Territory,
subject to the limitations set forth in Section 3.5(B).  The right to sublicense
to a Third Party shall be subject to the approval of SONUS, such approval not to
be unreasonably withheld.

          (C)  ABBOTT's licenses hereunder shall become  paid-up upon ABBOTT
tendering to SONUS all payments due pursuant to Appendix 2.3.

6.   LAUNCH BUDGETS; REIMBURSEMENT PAYMENTS

     6.1 LAUNCH BUDGETS.  ABBOTT and SONUS shall each prepare separate pro forma
launch budgets to cover their respective expenses associated with and incurred
after the launch of the Product which shall be mutually approved by the parties.
Within thirty (30) days of FDA Advisory Panel approval, ABBOTT and SONUS will
meet to review and, if appropriate and mutually agreeable, update such launch
budgets for the period for which Launch Budget Reimbursement Payments may be
required as set forth in Section 6.2.  The parties will thereafter meet
quarterly during this period to review and, if appropriate and mutually
agreeable, update such budgets.  Each party's launch budget shall include the
expense line items and allocation of the expense items between ABBOTT and SONUS.


                                       27

<PAGE>

     6.2 LAUNCH BUDGET REIMBURSEMENT PAYMENTS.  Each quarter following the 
First Shipment Date and until either the second anniversary of the First 
Shipment Date or the achievement of Net Sales of Product in the Territory of 
at least twenty-five million dollars ($25,000,000) in each of two consecutive 
quarters, whichever comes first, one party shall pay to the other party an 
amount equal to fifty percent (50%) of the excess of budget launch expenses 
of one party over the budget launch expenses of the other party for the same 
period (e.g. if ABBOTT has budget launch expenses of [Confidential Portion] 
and SONUS has budget launch expenses of [Confidential Portion] in the first 
twelve (12) months of Product sales, the amount to be paid by SONUS is 
[Confidential Portion].  The payment will be made within sixty (60) days of 
the end of each calendar quarter for the period the launch expenses are 
incurred.  In the case of payment to be made by SONUS, the amounts payable 
shall be offset against payments to be made by ABBOTT to SONUS as set forth 
in Article 7.  In the case of payments to be made by ABBOTT, the payments 
will be made by wire transfer.  Each party shall supply to the other party 
all wire transfer account information.

     6.3 LOSS CARRY FORWARD.  If a Launch Budget Reimbursement Payment as
calculated in Section 6.2 is to be made by SONUS to ABBOTT and such Launch
Budget Reimbursement Payment has not been fully paid by SONUS to ABBOTT by the
expiration of twenty-four (24) months following the First Shipment Date, or the
achievement of Net Sales of Product in the Territory of at least twenty-five
million dollars ($25,000,000) in each of two (2) consecutive quarters, whichever
should first occur, then the unpaid amount shall be carried forward and offset
against Revenue Payments for subsequent quarters until such time as the entire
Launch Budget


                                       28

<PAGE>

Reimbursement Payment has been paid or credited to ABBOTT.

7.   REVENUE PAYMENTS

     7.1 CALCULATION OF REVENUE PAYMENTS.  Following the First Shipment Date,
ABBOTT shall pay SONUS an amount as calculated in the following formula
("Revenue Payment").

<TABLE>
<S>                   <C>                              <C>
Revenue   =   47%  x  Units of Finished Product    x   Average Unit Selling Price
Payment               accepted by ABBOTT into          from prior Quarter
                      Finished Goods Inventory
                      LESS:  returned goods,
                      Inventory outdates, recalls
                      and/or withdrawals
</TABLE>

     For the first quarter following the First Shipment date, the estimated
Average Unit Selling Price shall be communicated to SONUS on or before ninety
(90) days prior to the First Shipment Date.   The Revenue Payment for any
quarter shall be paid within thirty (30) days after the end of each such
calendar quarter or ninety (90) days after the Finished Product is placed in
Finished Goods Inventory, whichever is earlier.  The payment will be made by
wire transfer.  SONUS shall supply to ABBOTT all wire transfer account
information.  At the time of the wire transfer, ABBOTT shall send to SONUS by
electronic-mail, facsimile or overnight courier, a report to SONUS setting forth
the calculation used to determine the Revenue Payment, including launch budget
reimbursement payments.

     7.2 SONUS CO-PROMOTION.  If SONUS is co-promoting the Product in the
Territory pursuant to Section 3.2(B), all sales of Product by SONUS shall be
credited to ABBOTT and included in gross sales for purposes of the Revenue
Payment


                                       29

<PAGE>

calculation.  In the event that SONUS is co-promoting the Product under
3.2(B)(iii), the Revenue Payments due by ABBOTT to SONUS under Article 7 shall
be adjusted to reflect SONUS' additional contribution at such time and in such
amount as the parties mutually agree.

     7.3 RECORDS AND AUDIT.  ABBOTT and SONUS shall keep and maintain records of
sales made and expenses incurred pursuant to this Agreement.  On a monthly
basis, ABBOTT shall provide SONUS with records of sales of Units by list numbers
consistent with ABBOTT's other products of a similar nature in the normal course
of business.  On a quarterly basis, ABBOTT shall provide SONUS with reports
reconciling sales of Products with discounts and other deductions to support Net
Sales figures. Such records shall be kept for a period of four (4) years after
the sales period to which such records relate. During this period, such records
shall be open to inspection upon reasonable written notice by one party to the
other.  Such inspection shall be performed by a nationally recognized
independent certified public accountant selected by the requesting party and
approved by the other party, which approval shall not be unreasonably withheld.
All expenses of such inspection shall be borne by the requesting party.
However, (i) if an inspection initiated by SONUS reveals that payments to SONUS
have been understated by five percent (5%) or more, and if such understatement
is greater than $25,000, ABBOTT shall pay the cost of inspection, the


                                       30

<PAGE>

understated amount and interest at the prime rate of interest on the understated
amount, and (ii) if an inspection initiated by ABBOTT reveals that figures
reported by SONUS to ABBOTT have been understated by five percent (5%) or more
and if such understatement is greater than $25,000, SONUS shall pay the cost of
inspection, the understated amount and interest at the prime rate of interest on
the understated amount.   Any independent certified public accountant engaged by
either party shall sign a confidentiality agreement prior to any audit and shall
then have the right to examine the records kept pursuant to this Agreement and
report findings (but not the underlying data) of the examination to the
requesting party as is necessary to evidence that records were or were not
maintained and used in accordance with this Agreement.  A copy of any report
provided to the requesting party by the independent certified public accountant
shall be given concurrently to the other party.

8.  WARRANT

     8.1  PURCHASE.  ABBOTT shall concurrently herewith purchase, and SONUS
agrees to sell and issue, at ABBOTT's request, warrants evidenced by a warrant
certificate substantially in the form of Exhibit A ("Warrant"), for five hundred
thousand (500,000) shares of SONUS' common stock at an exercise price equal to
sixteen dollars ($16.00) per share subject to adjustments as set forth in the
Warrant.  The  Warrant shall be priced at eight dollars ($8.00) per share, which
price per share will  be paid concurrently with the issuance of the Warrant.
The Warrant shall be exercisable at any time after receipt  by ABBOTT for a
period of five (5) years from the date of ABBOTT's receipt of the Warrant.

     8.2  REGISTRATION RIGHTS.  SONUS shall, prior to or on the Effective Date,
cause to be amended the Sonus Pharmaceuticals, Inc. Amended and Restated
Registration Rights Agreement dated November 23, 1994, as amended ("Registration
Rights Agreement"), to include ABBOTT as a "Holder" thereunder and include the
shares of common stock issuable upon exercise of the Warrant as "Registrable
Securities", as


                                       31

<PAGE>

the terms "Holder" and "Registrable Securities" are defined in the Registration
Rights Agreement.  In the event that SONUS is unable to cause such amendment
prior to the Effective Date, SONUS shall cause such amendment within thirty (30)
days of the Effective Date.

     8.3  PROHIBITION.  With the exception of the purchase under Section 8.1,
ABBOTT, and its Affiliates for the term of this Agreement, shall not, without
the prior written consent of  SONUS, acquire or agree to acquire, by purchase or
otherwise,  any voting securities of SONUS or any subsidiary of SONUS.

9.  BUYOUT OPTION

     It is the intent of the parties to provide for a buyout of this Agreement
by one party from the other subject to the mutual agreement of the parties.  On
the sixth (6th), ninth (9th), and twelfth (12th) anniversary  of the Effective
Date, either party may give written notice to the other party of its interest in
buying out the other party's rights and obligations under this Agreement.   If
both parties agree, a process will be established whereby either party may buy
out the rights and obligations of the other party in the Territory at a price
equal to or greater than the net present value of the projected net profit
before tax, discounted at fifteen percent (15%) for the remaining term of the
Agreement ("Option Price").  If both parties desire to exercise the buyout and
ABBOTT and SONUS do agree on the Option Price, then the representatives of
ABBOTT and  SONUS shall meet and simultaneously exchange closed bids, which bids
shall be opened in  the presence of both representatives.  If both parties
agree, the higher bid shall prevail.  If the parties mutually agree that the
buyout is to take place,  the parties shall enter into an agreement that sets
forth the timetable and process  for the orderly


                                       32

<PAGE>

transfer of such rights.  If both parties do not agree on the calculation of the
buyout price or do not agree on the transfer of rights and terms of the buyout,
then the buyout shall not take place and notwithstanding anything else in this
Article, the buyout option will not be effective again during the remaining term
of this Agreement.

10.  RIGHT OF FIRST REFUSAL FOR ADDITIONAL PRODUCTS

     In the event SONUS desires to grant any license to market or distribute to
a Third Party, any ultrasound diagnostic imaging products for the Field and in
the Territory which are not covered by the license set forth in Section 5 or the
terms of Section 2.4 and which are the proprietary technology of SONUS
including, but not limited to those technologies commonly referred to as
PhaseShift-TM- and High-Q Factor-TM-, then ABBOTT shall have a right of first
refusal with respect to the license or sale of such product in the Field and in
the Territory.  If SONUS desires to solicit offers from Third Parties to market
and sell such product for the Field in the Territory, then SONUS shall promptly
give written notice to ABBOTT.  Within thirty (30) days of such notice, ABBOTT
shall indicate whether or not it is interested in such product.  If ABBOTT is
interested, SONUS and ABBOTT shall negotiate in good faith for a maximum of
sixty (60) days to mutually determine the material terms of a definitive
agreement regarding such product.  If ABBOTT and SONUS do not reach such
agreement, but during the negotiation period, ABBOTT offered in writing economic
terms which were rejected by SONUS, and during the term of this Agreement SONUS
subsequently solicits and receives a bona fide Third Party offer on the same or
less favorable economic terms considered as a whole than those offered by
ABBOTT, then SONUS shall promptly notify ABBOTT in writing.  ABBOTT then may
offer to meet such


                                       33

<PAGE>

terms within forty-five (45) days from such notice.  The parties will then
negotiate in good faith towards a definitive agreement for the product.  If
ABBOTT does not offer to meet such terms within such forty-five (45) day period,
then ABBOTT shall have no further rights under this Section 9 with respect to
such product.  Nothing herein shall restrict SONUS from itself marketing,
selling or distributing any such product.

11.  REPRESENTATIONS AND WARRANTIES

     11.1  SONUS hereby represents and warrants that:

          (A)  SONUS has the full right, power and corporate authority to enter
into this Agreement, and to make the promises and grant the licenses set forth
in this Agreement and that there are no outstanding  agreements, assignments or
encumbrances in existence inconsistent with the  provisions of this Agreement.

          (B) To the best knowledge of SONUS, the Licensed Patents have not or
will not be obtained through any  activity, omission or representation that
would limit or destroy the validity of the  Licensed Patents and SONUS has no
knowledge or information that would materially adversely impact on or affect the
validity and/or enforceability of the Licensed Patents.

          (C)  There are no actions threatened or pending before any court or
governmental agency or other tribunal other than the PTO relating to the
Licensed Patents or Know-How.

          (D)  SONUS has not authorized and will not during the term of this
Agreement authorize Third Parties to practice the  Licensed Patents or the Know-
How in the Field in the Territory or otherwise grant rights or licenses  to
market and sell the  Product in the Field in the Territory, other than as may be
granted in any patent


                                       34

<PAGE>

infringement settlement as permitted pursuant to the terms of Section 3.8(C).

          (E)  No Third Party has acquired, owns or possesses any right, title
or  interest in or to the Licensed Patents or Know-How in the Field in the
Territory.

     11.2  ABBOTT hereby represents and warrants that:

          (A)  ABBOTT has the full right, power and corporate authority to enter
into this Agreement and to make the promises set  forth in this Agreement and
that there are no outstanding agreements, assignments or  encumbrances in
existence inconsistent with the provisions of this Agreement.

          (B) ABBOTT is an "accredited investor" within the meaning of Rule 501
under the Securities Act of 1933, as amended (the "Act") and hereby certifies
that all shares of common stock in SONUS purchased or to be purchased by it
pursuant to the exercise of the Warrants set forth in Articles 4 and 8 are
being, or are to be, acquired by it for investment, and not with a view to the
distribution thereof.  Further, ABBOTT understands that the common stock to be
purchased pursuant to the exercise of such Warrants will be "restricted
securities" and may not be sold, transferred or otherwise disposed of without
registration under the Act, or an exemption therefrom, and that in the absence
of an effective registration statement, or an available exemption from
registration under the Act, the common stock must be held indefinitely.

12.  TERM AND TERMINATION

     12.1  TERM.  The term of this Agreement shall commence on the Effective
Date, and unless sooner terminated pursuant to Section 12.2 or Article 9, and
shall continue in effect until the last to expire of the patents under the
Licensed Patents or end of the life of the branded Product, whichever is
longer.   The "life of  the branded Product"


                                       35

<PAGE>

shall be defined as the time period ending three (3) months after  FDA approval
of the first generic form of the Product to be marketed by a Third Party  in the
Territory.  Upon expiration of the term of this Agreement pursuant to this
Section 12.1 ABBOTT shall have a fully paid up, irrevocable and non-exclusive
license under the Know-How.

     12.2  EARLY TERMINATION.  This Agreement may be terminated in accordance
with the following provisions:

          (A)  SURRENDER.  In whole or in part by ABBOTT's surrender and
termination of the licenses and rights granted hereunder at any time upon one
(1) year prior written notice to SONUS.

          (B)  INSOLVENCY.  By notice by either party to the other party upon
(i)  the insolvency of the other party, or the appointment of a receiver by the
other party for  all or any substantial part of its properties, provided that
such receiver is not  discharged within sixty (60) days of his appointment; (ii)
the adjudication of the other party as a bankrupt; (iii) the admission by the
other party in writing of its inability to generally pay its debts as they
become due; (iv) the execution by the other party of an assignment for  the
benefit of its creditors; or (v) the filing by the other party of a petition to
be adjudged  a bankrupt, or a petition or answer admitting the material
allegations of a petition filed  against the other party in any bankruptcy
proceeding, or the act of the other party in  instituting or voluntarily being
or becoming a party to any other judicial proceeding  intended to effect a
discharge of the debts of the other party, in whole or in substantial part.

          (C)  PRODUCT FAILURE.   If the Product is found to be not safe or
efficacious by ABBOTT, then ABBOTT may terminate this Agreement upon thirty (30)
days written


                                       36

<PAGE>

notice to SONUS, subject to applicable indemnification as set forth in Section
13.1.

          (D)  SUPPLY FAILURE.   In the event of failure to supply Product, the
provisions of Section 3.5 shall apply.  Any termination under Section 3.5 shall
be subject to the provisions of Section 12.3(E).

          (E)  DEFAULT.  Except as provided in Section 12.2 and Section 17.1,
the  rights set forth in this Article 12 to terminate this Agreement and to
terminate the licenses granted hereunder are the only such rights of the parties
to take  such actions under this Agreement.  If either party believes that the
other party has  committed a breach of any material provision of this Agreement,
the following shall apply:

               (i)  If the other party  has failed to remedy such breach within
ninety (90) days after the receipt of notice in  writing of such breach from the
nonbreaching party, then the nonbreaching party may submit the issue of whether
the other party has committed a breach of any material  provision hereunder for
resolution in accordance with the procedure set forth in Article 21
(Alternative Dispute Resolution); and

               (ii)  If the neutral person (as set forth in Article 21) in
accordance with the procedures set forth in Article 21 renders a ruling that the
breaching party has materially breached the Agreement; and

               (iii)  If the breaching party has materially failed to comply
with the  terms of such ruling within the time period specified therein for
compliance or, if no time  period is stated, then the nonbreaching party has
served notice upon the breaching  party to undertake the actions specified to
comply with the terms of the ruling and the breaching party has materially
failed, within thirty (30) days of such


                                       37

<PAGE>

notice with regard to payment obligations and within ninety (90) days of such
notice with regard to other obligations, to undertake such action; then the
nonbreaching party shall have the right to terminate this Agreement by
delivering written notice to the breaching party within thirty (30) days after
expiration of the applicable period under Section 12.2(E)(iii).

               (iv)  In the event that ABBOTT is the non-breaching party, in
lieu of terminating the Agreement, ABBOTT may proceed under Section 12.4.

     12.3  CONSEQUENCES OF EXPIRATION OR EARLY TERMINATION; SURVIVAL

          (A)  Upon expiration or early termination, including that set forth in
Section 12.2(A), SONUS shall retain ownership of all regulatory filings or
approvals,  clinical data and all other data developed by SONUS in the
Territory; ABBOTT  shall retain ownership of all data developed solely by ABBOTT
in the Territory.   In the event of surrender or early termination, ABBOTT shall
make no further use of the  Licensed Patents or Know-How within the Territory.
Upon expiration or termination, any sublicenses granted under such licenses
shall be terminated.   Expiration or early termination of the Agreement shall
not effect the Supply Agreement,  which shall remain effective as to its terms.

          (B)  If this Agreement is terminated in part or in whole by ABBOTT
under  Section 12.2, then SONUS, at ABBOTT's option,  shall repurchase all
remaining Product which is reasonably resalable from ABBOTT at ABBOTT's cost,
unless otherwise mutually agreed by the parties, within thirty (30) days of
termination.

          (C)  If the Agreement is terminated under Section 12.2(B), then the
parties shall have the rights as set forth in those bankruptcy statutes, as may
be


                                       38

<PAGE>

amended at the time of such termination, governing intellectual property rights
of  licensors and licensees, as appropriate, in a bankruptcy proceeding.

          (D)  If this Agreement is terminated by either party for any reason,
then  ABBOTT's exclusive license hereunder shall terminate, SONUS shall
repurchase the  remaining Product which is reasonably resalable from ABBOTT at
ABBOTT's cost, unless otherwise mutually agreed by the parties within thirty
(30) days of termination and neither party will have any  further liability to
the other except as set forth in Section 12.3(E).  If this Agreement is
terminated by either party under Section 12.2(D) or 12.2(E) due to breach of the
provisions of this Agreement, then the non-breaching party may seek damages for
breach from the breaching party.  If the breach is a breach of a representation
or warranty set forth in Article 11, then the non-breaching party shall also
have the remedy set forth in Article 13.  Neither party shall have any further
liability to the other except as set forth in Section 12.3(E) and this Section.

          (E)  Expiration or early termination of this Agreement shall not
relieve  either party of its obligations incurred prior to expiration or early
termination.  The  obligations under Article 22 (Publicity); Article 21
(Alternative Dispute Resolution); Article 19 (Assignment); Article 15
(Confidential  Information);  Article 14 (Limitation of Liability); Article 13
(Indemnification); and Article 11 (Representations and Warranties) shall
survive expiration or early termination of this Agreement or of any extensions
thereof.

     12.4   ABBOTT RIGHT TO CONTINUE.   Notwithstanding the foregoing, in the
event of default by SONUS under Section 12.2(E), then ABBOTT may, at ABBOTT's
option (i) seek damages for breach by SONUS and continue to operate under the
Agreement


                                       39

<PAGE>

and keep the Agreement in effect, in which case ABBOTT shall have the right, but
not the obligation, to assume any and all responsibilities of SONUS as set forth
under Article 3 and be entitled to adjustment in the division of revenue
reflecting ABBOTT's assumption of such responsibilities as reasonably determined
by ABBOTT, or (ii) seek damages for breach by SONUS and terminate the Agreement.

13.  INDEMNIFICATION

     13.1  BY SONUS.   SONUS shall indemnify, defend and hold ABBOTT, its
directors, employees, agents and representatives harmless from and against all
claims, causes of action, settlement costs, (including reasonable attorney fees
and expenses), losses or liabilities of any kind (A) which are asserted by a
Third Party and which (i) arise out of or are attributable to any negligent act
or omission or willful misconduct on the part of SONUS, its directors,
employees, agents or representatives, or (ii) involve the use of the Product  as
a pharmaceutical product or the safety or efficacy of the Product, including any
theory of strict liability in tort or any other theory of product liability, and
which are not otherwise attributable to any negligent  act or omission or
willful misconduct on the part of ABBOTT, its directors, employees,  agents or
representatives; or (iii) arise from claims that the product or its manufacture,
use or sale infringes a patent, trademark or other proprietary right of a Third
Party provided that the infringement does not relate solely to the manufacturing
procedure of ABBOTT; or (B) arise from a breach of a representation or warranty
in Section 11.1; (C) arise out the negligent act or omission or willful
misconduct by SONUS in the manufacture of the Product by SONUS; or (D) arising,
from the supply by SONUS and use by ABBOTT of bulk raw materials which fail to
comply with Bulk Raw Materials


                                       40

<PAGE>

Specifications, as defined in the Supply Agreement, where ABBOTT manufactures
the Product.

     13.2  BY ABBOTT.  ABBOTT shall indemnify, defend and hold SONUS, its
directors, employees, agents and representatives harmless from and against all
claims,  causes of action, settlement costs (including reasonable attorney fees
and expenses),  losses or liabilities of any kind (A) which are asserted by a
Third Party and  which arise out of or are  attributable to any negligent act or
omission or willful misconduct on the part of  ABBOTT, its employees, agents, or
representatives, or (B) which arise from a breach of a representation or 
warranty in Section 11.2.

     13.3  CONDITION OF INDEMNIFICATION.  If either party expects to seek
indemnification under this Article, it shall promptly give notice to the
indemnifying party  of the basis for such claim of indemnification.  If
indemnification is sought as a result of  any Third Party claim or suit,  such
notice to the indemnifying party shall be within  fifteen (15) days after
receipt by the other party of such claim or suit (if to ABBOTT,  notice to
Abbott Laboratories, Risk Management, D-317, 100 Abbott Park Road, Abbott  Park,
IL 60064-3500; if to SONUS, notice as set forth in Article 18); provided,
however, that the failure to give notice within such time period shall not
relieve the indemnifying party of its obligation to indemnify unless it shall be
materially prejudiced by the failure.  Each party shall  cooperate fully with
the other party in the defense of all such claims or suits.  No offer of
settlement, settlement or compromise shall be binding on a party hereto without
its prior written consent (which consent will not be unreasonably withheld)
unless such  settlement fully releases the other party without any liability,
loss, cost or obligation to  such party.


                                       41

<PAGE>

14.  LIMITATION OF LIABILITY

     Except for Third Party liability arising under Article 13, in no event
shall either party be liable for loss of profits or other economic loss, or for
indirect, incidental, penal or consequential damages, or other similar damages
arising out of this Agreement.

15.  CONFIDENTIAL INFORMATION

     15.1  DUE CARE.  It is recognized by the parties that during the term of
this Agreement, the parties will exchange Confidential Information pertaining to
their performance hereunder.   Each party will exercise due care to prevent the
disclosure of Confidential Information of the other party.

     15.2  PERMITTED DISCLOSURES

          (A)  Notwithstanding the above, nothing contained in this Agreement
shall preclude SONUS or ABBOTT from utilizing or disclosing to others its
Confidential Information or utilizing Confidential Information received from the
other party as may be required (i) for regulatory purposes, including obtaining
FDA approvals; (ii) for audit, tax or customs purposes; or (iii) by law
(including disclosure obligations under applicable securities laws), court or
other government order, provided that the party subject to such order notifies
the other party and uses reasonable efforts to obtain a protective order
covering such Confidential Information.

          (B)  In addition to the foregoing, ABBOTT and SONUS may disclose the
Confidential Information of the other party, only to such employees or Third
Parties who have a reasonable need for the Confidential Information in the
performance of their services in connection with the matters set forth in this
Agreement or otherwise within the scope of the licenses set forth in Article 5
and Section 3.9; who are informed


                                       42

<PAGE>

of the confidential nature of the Confidential Information; and who are bound
not to disclose such Confidential Information.

     15.3  OTHER AGREEMENTS.  The parties have entered into a Confidential
Disclosure Agreement dated October 7, 1992 ("CDA").  The CDA shall remain in
full force and effect as to its confidentiality requirements for the terms
specified therein.  However, on and after the Effective Date of this Agreement,
all subject matter conveyed or covered under this Agreement shall be governed in
all respects by the confidentiality provisions contained in this Article 15.
The obligations of the parties set forth in this Article 15 shall apply during
the term hereof and for a period of five (5) years after the date of early
termination or expiration of this Agreement or any extension thereof.

16.  NON-COMPETE

     For a period of five (5) years after the Effective Date each party and its
Affiliates shall undertake not to market or sell a competing product in the
Territory to an end user.  However, nothing contained in this Article 16 shall
be construed as preventing (i) either party from conducting research and
development, manufacturing, formulation development, and/or distribution
activities relating to a competing product during such period or thereafter, or
(ii) the grant of any rights in any patent infringement settlement as permitted
pursuant to the terms of Section 3.8(C).

     For purposes of this Article 16, a competing product shall mean a product
in the Field whose mode of action and/or mechanism is materially similar to the
Product.

17.  FORCE MAJEURE

     17.1  EVENTS OF FORCE MAJEURE.  Delay or failure on the part of either
party in


                                       43

<PAGE>

performing its obligations under this Agreement shall not subject such party to
any liability to the other if such delay or failure is caused by or results from
acts such as but not limited to acts of God, fire, explosion, flood, drought,
war, riot, sabotage, embargo, strikes or other labor trouble, or compliance with
any law, order or regulation of any government entity acting with color of
right.

     17.2  CONSEQUENCES OF FORCE MAJEURE.  Upon occurrence of an event of force
majeure, the party affected shall promptly notify the other in writing, setting
forth the details of the occurrence, and making every attempt to resume the
performance of its obligations as soon as practicable after the force majeure
event ceases.   If such event prevents performance by one party for more than
six (6) months, then the other party may terminate this Agreement subject to
Section 12.3.

18.  NOTICES

     Any notices permitted or required by this Agreement shall be sent by (A)
facsimile, (B) registered mail or (C) a recognized private mail carrier service,
and such notice shall be effective on the date received as indicated by the
facsimile imprint date in the case of (A) and the carrier receipt in the case of
(B) and (C).   If sent and addressed as follows or to such other address as may
be designated by a party in writing:

     If to SONUS:        SONUS PHARMACEUTICALS, INC.
                         22026 20th Avenue, S.E.
                         Suite 102
                         Bothell, Washington 98021
                         Telefax: (206) 489-0626
          Attention:     Steven Quay, M.D., Ph.D



                                       44

<PAGE>

     With a copy to:     Stradling, Yocca, Carlson & Rauth
                         660 Newport Center Drive, Suite 1600
                         Newport Beach, CA 92660-6441
                         Telefax: (714) 725-4100
          Attention:     K. C. Schaaf

     If to ABBOTT:       ABBOTT LABORATORIES
                         Hospital Products Division
                         200 Abbott Park Road
                         Abbott Park, IL 60064-3537
                         Telefax: (847) 937-0805
          Attention:     President, Hospital Products Division

     With copy to:       Division Vice President
                         Domestic Legal Operations
                         D-322, AP6D
                         Abbott Laboratories
                         100 Abbott Park Road
                         Abbott Park, IL 60064-3500
                         Telefax: (847) 938-1206


19.  ASSIGNMENT

     19.1 LIMITATION ON ASSIGNMENT.  This Agreement may not be assigned or
transferred by either party, whether by operation of law or otherwise, except
that either party may assign this Agreement to any of its Affiliates, or to any
successor by merger or sale of substantially all of its business unit to which
this Agreement relates without the consent of the other party.  Any attempted
delegation or assignment not in accordance with this Article 19 shall be of no
force or effect.

     19.2 ASSUMPTION BY ABBOTT.  In the event that SONUS sells, transfers or
otherwise assigns this Agreement to a third party ("Assignee") as permitted in
this Article 19, and ABBOTT, in ABBOTT's reasonable discretion, determines that
the Assignee is not at least as capable as SONUS of performing its (SONUS')
responsibilities under this Agreement, ABBOTT may, upon thirty (30) days prior
written


                                       45


<PAGE>

notice to Assignee, assume any or all of Assignee's responsibilities under this
Agreement, including, but not limited to, responsibilities set forth in Section
3 and  other responsibilities agreed to by the parties in accordance with
Section 6.1, and adjust, in ABBOTT's reasonable discretion,  the Revenue Payment
set forth in Article 7 proportionately in accordance with the reduction in the
responsibilities of Assignee.

20.  SUCCESSORS AND ASSIGNS

     This Agreement shall inure to the benefit of and be binding upon the
parties hereto and their successors and permitted assigns.

21.  ALTERNATIVE DISPUTE RESOLUTION

     The parties agree that any dispute that arises in connection with this
Agreement shall first be presented to the respective presidents of the ABBOTT
Hospital Products Division, and of SONUS, or their designees, for resolution.
If no resolution is reached, then such dispute shall be resolved by binding
Alternative Dispute Resolution ("ADR") in the manner described in the Appendix
21.  Anything herein to the contrary notwithstanding the neutral shall not have
the ability to change or alter any decision of ABBOTT to exercise its rights
under Section 12.4.

22.  PUBLICITY

     The parties agree that upon the execution of this Agreement, a press
release approved by both parties will be issued.   Except for such press release
and periodic disclosures by SONUS required by law or regulation or in the
ordinary course of its SEC filings, neither party shall (A) originate any
publicity, news release or other public announcement, written or oral, whether
to the public press, stockholders or otherwise, relating to this Agreement, any
amendment hereto or performance hereunder, or (B)


                                       46

<PAGE>

use the name of the other in any publicity, news release or other public
announcement, except (i) with the prior written consent of the other party, or
(ii) as required by law, in which case the originating party will give to the
other party at least ten (10) days prior notice of such proposed disclosure to
complete a review in order to offer comments and modifications.  Consistent with
applicable law, the other party will have the right to request reasonable
changes to the disclosure to protect its interests.  In all other cases, the
originating party shall give the consenting party at least twenty-one (21) days
to complete a review in order to offer comments, modifications or to give such
consent.  The party required to give consent shall endeavor to respond in less
than twenty-one (21) days if practicable.

23.  RELATIONSHIP OF PARTIES

     The relationship of the parties under this Agreement is that of independent
contractors.   Nothing contained in this Agreement is intended or is to be
construed so as to constitute the parties as partners, joint venturers, or
either party as an agent or employee of the other.  Neither party has any
express or implied right under this Agreement to assume or create any obligation
on behalf of or in the name of the other, or to bind the other party to any
contract, agreement or undertaking with any Third Party, and no conduct of the
parties shall be deemed to infer such right.

24.  APPENDICES AND EXHIBITS

     All Appendices and Exhibits referenced herein are hereby made a part of
this Agreement.


                                       47

<PAGE>

25.  HEADINGS

     The headings used in this Agreement are for convenience only and are not a
part of this Agreement.

26.  WAIVER

     No waiver by either party of any default, right or remedy shall be
effective unless in writing, nor shall any such waiver operate as a waiver of
any other or of the same default, right or remedy respectively, on a future
occasion.

27.  SEVERABILITY

     If any term or provision of this Agreement shall for any reason be held
invalid, illegal or unenforceable in any respect, such invalidity, illegality or
unenforceability shall not affect any other term or provision hereof, and this
Agreement shall be interpreted and construed as if such term or provision, to
the extent the same shall have been held to be invalid, illegal or
unenforceable, had never been contained herein.

28.  ENTIRE AGREEMENT; AMENDMENT

     Except as specifically contemplated in this Agreement and except for the
CDA and the Supply Agreement, this Agreement sets forth the entire understanding
of the parties with respect to the subject matter hereof and supersedes all
prior agreements, written and oral, between the parties.   No modification of
any of the terms of this Agreement shall be deemed to be valid unless it is in
writing and signed by both parties.  No course of dealing or usage of trade
shall be used to modify the terms and conditions herein.


                                       48

<PAGE>

29.  APPLICABLE LAW

     This Agreement shall be governed by and construed in accordance with the
laws of Washington, excluding its conflict of laws principles.

30.  COUNTERPARTS

     This Agreement may be executed in any number of counterparts, each of which
shall be deemed an original, but all of which together shall constitute one and
the same instrument.

                            [Signature Page Follows]


                                       49

<PAGE>

     IN WITNESS WHEREOF, each of the parties hereto has caused this Agreement to
be executed by its duly authorized representative as of the day and year first
above written.


ABBOTT LABORATORIES                          SONUS PHARMACEUTICALS, INC.



By:  /s/ John G. Kringel                     By: /s/ Steven C. Quay, M.D., Ph.D
   -------------------------------              --------------------------------
     John G. Kringel                             Steven C. Quay, M.D., Ph.D
     President                                   President and Chief Executive
     Hospital Products Division                    Officer



                                       50


<PAGE>

                                  APPENDIX 2.3

                            RESEARCH AND DEVELOPMENT
                                PAYMENT SCHEDULE


Execution of definitive agreement              $4 Million
(Includes $1,000,000 payment for grant of licenses)

Quarterly Milestone Payments*

     Payment 1                                 $1 Million
     Payment 2                                 $1 Million
     Payment 3                                 $1 Million
     Payment 4                                 $1 Million
     Payment 5                                 $1 Million
     Payment 6                                 $1 Million
     Payment 7                                 $1 Million

Filing NDA**    within 15 days                 $2 Million
                within 105 days                $1 Million
                within 195 days                $1 Million

NDA acceptance by FDA**
                within 15 days                 $1 Million
                within 105 days                $1 Million
                within 195 days                $1 Million
                within 285 days                $1 Million

Advisory Panel Approval**
                within 15 days                 $2 Million
                within 105 days                $2 Million
                within 195 days                $2 Million

NDA approval                                   $2 Million

First Shipment of Product                      $4 Million


*    Payments made on January 1, April 1, July 1, and October 1.  Payments will
     begin on the first quarter after the Effective Date.

**   For indications substantially as listed in Appendix 1.6.


<PAGE>

                                    EXHIBIT A

THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED UNDER 
THE SECURITIES ACT OF 1933; THEY HAVE BEEN ACQUIRED BY THE HOLDER FOR 
INVESTMENT AND MAY NOT BE PLEDGED, HYPOTHECATED, SOLD, TRANSFERRED OR 
OTHERWISE DISPOSED OF EXCEPT AS MAY BE AUTHORIZED UNDER THE SECURITIES ACT OF 
1933 AND THE RULES AND REGULATIONS PROMULGATED THEREUNDER.

Warrant Certificate No. _____ 
______________, 1996                            
            ___________ Warrants                            SONUS 
PHARMACEUTICALS, INC.

                               WARRANT CERTIFICATE

     THIS WARRANT CERTIFICATE (the "Warrant Certificate"), certifies that 
_________________ or registered assigns (the "Holder"), is the owner of 
_______ warrants ("Warrants"), each of which entitles the Holder hereof to 
purchase, as and when described herein one fully paid and non-assessable 
share of common stock, as such shares may be adjusted pursuant to Paragraph 
5, ("Common Stock") of SONUS PHARMACEUTICALS, INC., a Delaware corporation 
(the "Company"), at a purchase price of $________ per share during the term 
of this Warrant Certificate.

     1.   WARRANT.  Each Warrant entitles the Holder to purchase one fully 
paid and nonassessable share of Common Stock of the Company (such number 
being subject to adjustment as provided in Paragraph 5 hereof) on the terms 
and conditions herein set forth.

     2.   PURCHASE PRICE.  The purchase price of the shares of Common Stock 
covered by the Warrants shall be $_______ per share, subject to adjustment as 
provided in Paragraph 5 hereof.  The purchase price of the shares of Common 
Stock as to which the Warrants shall be exercised shall be paid in full at 
the time of exercise and such consideration may consist of cash, check or 
bank draft.

     3.   TERM OF WARRANT.  The term of Warrants shall commence on the date 
hereof and all rights to purchase shares of Common Stock hereunder shall 
cease at 11:59 P.M. on ______________________, _________, subject to earlier 
termination as provided herein.  Warrants granted hereunder may be exercised 
at any time from the date hereof until expiration hereof.  The Holder of the 
Warrants shall not have any of the rights of a stockholder with respect to 
the shares covered by the Warrants as to any shares of Common Stock not 
actually issued and delivered to it.

     4.   TRANSFERABILITY.  The Warrants shall not be transferable or 
assignable except to an Affiliate of the Holder without the prior written 
consent of the Company, which consent shall not be unreasonably withheld.  
The Holder may transfer or assign the shares of Common Stock issuable upon 
exercise of the Warrants; provided, however, that (i) a registration 
statement with respect thereto has become effective under the Securities Act; 
or (ii) in the opinion of counsel to the Holder such registration is not 
necessary; or (iii) such transfer complies with the provisions of Rule 144 
under the Securities Act of 1933, as amended (the "Securities Act").  The 
legend imprinted on the certificates pursuant to Section 10 shall be removed, 
and the Company shall issue a new certificate without such legend to the 
Holder of such security if such security is registered under the Securities

<PAGE>

Act or, in the opinion of counsel to the Holder such legend is no longer 
required under the Securities Act or the conditions for a permissible sale or 
transfer under Rule 144(k) have been complied with.  For purposes of this 
Warrant Certificate, "Affiliate" shall mean any wholly-owned subsidiary or 
parent of, or any corporation, entity or other person which is, within the 
meaning of the 1933 Act, controlling, controlled by or under common control 
with, the Holder or the Company, as the case may be.

     5.   ADJUSTMENTS FOR STOCK SPLITS, CONSOLIDATIONS, ETC.  The purchase 
price and number and class of shares subject to this Warrant Certificate 
shall all be proportionately adjusted in the event of any change or increase 
or decrease in the number of issued shares of Common Stock in the Company, 
without receipt of consideration by the Company, which result from a split-up 
or consolidation of shares, payment of a share dividend, a recapitalization, 
combination of shares or other like capital adjustment, so that, upon 
exercise of this Warrant Certificate, the Holder shall receive the number and 
class of shares it would have received had it been the holder of the number 
of shares of Common Stock in the Company, for which this Warrant Certificate 
is being exercised, on the date of such change or increase or decrease in the 
number of issued shares of Common Stock in the Company.  If the Company shall 
reorganize, consolidate or merge with or into any other corporation where the 
Company is not the surviving entity, then each share of Common Stock shall be 
convertible into the consideration to which the shares of Common Stock 
subject to this Warrant Certificate would have been entitled to receive upon 
the effectiveness of such reorganization, merger or consolidation.  
"Affiliate" shall have the meaning set forth in Paragraph 4.  Adjustments 
under this paragraph shall be made by the Board of Directors in its 
reasonable, good faith judgment, whose determination with respect thereto 
shall be final and conclusive.  No fractional shares shall be issued under 
this Warrant Certificate or upon any such adjustment.

     6.   METHOD OF EXERCISING WARRANTS.

          (a)  Subject to the terms and conditions of this Warrant 
Certificate, the Warrants may be exercised by surrender of the Warrant 
Certificate together with delivery to the Company at its principal office of 
a signed Subscription Agreement in the form attached hereto as Annex 1 (the 
"Subscription Agreement") specifying the number of shares to be purchased.  
Such Subscription Agreement shall be accompanied by payment in cash, check or 
bank draft, payable to the Company, equal to, in the aggregate, the full 
purchase price of such shares. The Company shall deliver a certificate or 
certificates representing the shares subject to such exercise as soon as 
practicable after the Subscription Agreement and consideration for the shares 
shall have been received by the Company, and the Holder shall be deemed a 
record holder of Common Stock upon such receipt by the Company.  All shares 
that shall be purchased upon the exercise of the Warrants as provided herein 
shall be fully paid and nonassessable.

          (b)  In addition, the Holder shall have the right, upon its written 
request delivered or transmitted to the Company together with this Warrant 
Certificate, to exchange this Warrant Certificate, in whole or in part at any 
time or from time to time on or prior to _______________, _______, for the 
number of shares of Common Stock having an aggregate Fair Market Value 
(determined as set forth in Paragraph 6(c) below) on the date of such 
exchange equal to the difference between (1) the aggregate Fair Market Value 
on the date of such exchange of a number of shares designated by the Holder 
and (2) the aggregate exercise price the Holder would have paid to the 
Company to purchase such designated number of shares upon exercise of this 
Warrant Certificate. Upon any such exchange, the number of shares purchasable 
upon exercise of this Warrant Certificate shall be

                                        2

<PAGE>

reduced by such designated number of shares, and, if a balance of purchasable 
shares remains after such exchange, the Company shall execute and deliver to 
the Holder a new Warrant Certificate evidencing the right of the Holder to 
purchase such balance of shares.  No payment of any cash or other 
consideration shall be required.  Such exchange shall be effective upon the 
date of receipt by the Company of the original Warrant Certificate 
surrendered for cancellation and a written request from the Holder that the 
exchange pursuant to this Section be made, or at such later date as may be 
specified in such request.

     (c)  Fair market value of the Common Stock ("Fair Market Value") shall be
determined as follows:

          (i)    If the Common Stock is listed on a national securities 
exchange or admitted to unlisted trading privileges on such an exchange; or 
is listed on the Nasdaq National Market or Small Cap Market, the current Fair 
Market Value shall be the volume-weighted average price of the Common Stock 
on such exchange or Nasdaq for the ten (10) business days prior to the date 
of exchange of this Warrant; or

          (ii)   If the Common Stock is not so listed or admitted to unlisted 
trading privileges or quoted on Nasdaq, the current Fair Market Value shall 
be the volume-weighted average of the mean of the last bid and asked prices 
reported for the ten (10) business days prior to the date of the exchange of 
this Warrant (1) by Nasdaq, or (2) if reports are unavailable under clause 
(i) above, by the National Quotation Bureau Incorporated; or

          (iii)  If the Common Stock is not so listed or admitted to unlisted 
trading privileges and bid and asked prices are not so reported, the current 
Fair Market Value shall be determined in good faith as promptly as reasonably 
practicable by the Board of Directors.

     7.   REGISTRATION RIGHTS.  The Holder hereunder has been made a party to 
the SONUS Pharmaceuticals, Inc. Amended and Restated Registration Rights 
Agreement dated November 23, 1994, as amended ("Registration Rights 
Agreement"). The shares of Common Stock issuable upon exercise of this 
Warrant Certificate are included as "Registrable Securities" under the 
Registration Rights Agreement (as that term is defined in the Registration 
Rights Agreement) with all registration rights pertaining to such Registrable 
Securities.

     8.   GENERAL.  The Company shall at all times during the term of the 
Warrants reserve and keep available such number of shares of Common Stock as 
will be sufficient to satisfy the requirements of this Warrant Certificate, 
shall pay all original issue and transfer taxes with respect to the issue and 
transfer of shares pursuant hereto and all other fees and expenses 
necessarily incurred by the Company in connection therewith, and will from 
time to time use its best efforts to comply with all laws and regulations, 
which, in the opinion of counsel for the Company, shall be applicable thereto.

     9.   LEGENDS.  It is understood that the certificates evidencing the 
Common Stock purchased upon exercise of this Warrant Certificate may bear the 
following legend:

     "THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN       
REGISTERED UNDER THE SECURITIES ACT OF 1933; THEY HAVE BEEN ACQUIRED BY 
THE HOLDER FOR INVESTMENT AND MAY NOT BE

                                        3

<PAGE>

     PLEDGED, HYPOTHECATED, SOLD, TRANSFERRED, OR OTHERWISE DISPOSED
     OF EXCEPT AS MAY BE AUTHORIZED UNDER THE SECURITIES ACT OF 1933,
     AS AMENDED, AND THE RULES AND REGULATIONS PROMULGATED THEREUNDER."

     IN WITNESS WHEREOF, the Company has caused this Warrant Certificate to be
duly executed by its officers thereunto duly authorized, all as of the day and
year first above written.

                                             SONUS PHARMACEUTICALS, INC.



                                             By:
                                                  ------------------------------

                                             Its:
                                                  ------------------------------


                                        4

<PAGE>

                         ANNEX I TO WARRANT CERTIFICATE

                             SUBSCRIPTION AGREEMENT


     The undersigned holder of the Warrant Certificate to which this
Subscription Agreement is attached as Annex I hereby subscribes for ____________
shares of Common Stock which the undersigned is entitled to purchase pursuant to
the terms of such Warrant Certificate.  Payment of the purchase price for the
Warrants is being made concurrently herewith.

     I hereby certify that all of the shares of Common Stock, $0.001 par value,
of SONUS PHARMACEUTICALS, INC., purchased by the undersigned pursuant to the
exercise on this date of the Warrants granted to the undersigned by the Warrant
Certificate are being acquired by the undersigned for investment and not with a
view to the distribution thereof.

Date:
     -------------------------------


                                             ___________________________________
                                             Signature



                                             -----------------------------------
                                             Type or Print Name



                                             -----------------------------------
                                             Street Address



                                             ___________________________________
                                             City           State       Zip Code


<PAGE>
                                                               Exhibit 99.2

                           SONUS PHARMACEUTICALS, INC.

                           THIRD AMENDED AND RESTATED

                          REGISTRATION RIGHTS AGREEMENT


     This Third Amended and Restated Registration Rights Agreement is entered 
into as of May 15, 1996, by and among SONUS Pharmaceuticals, Inc., a Delaware 
corporation (the "Company"), Steven C. Quay, M.D., Ph.D. (the "Founder"), 
Daiichi Pharmaceutical Co., Ltd. ("Daiichi"), Mallinckrodt Medical, Inc., a 
Delaware corporation ("Mallinckrodt"), Abbott Laboratories, an Illinois 
corporation ("Abbott"), Guerbet, S.A. ("Guerbet"), certain holders of shares 
of Common Stock of the Company set forth on Exhibit 1 hereto (such persons, 
together with Guerbet, are herein collectively referred to as the "Common 
Holders"), and those Purchasers (the "Series A Purchasers") of the Company's 
Series A Preferred Stock pursuant to that certain Series A Preferred Stock 
Purchase Agreement dated as of November 1, 1991 (the "Series A Purchase 
Agreement").  The Founder, Daiichi, Mallinckrodt, Abbott and such Series A 
Purchasers shall be referred to collectively hereinafter as the "Holders" and 
each individually as a "Holder." 

                                R E C I T A L S :


     A.   The Company, the Founder and the Series A Purchasers entered into 
that certain Registration Rights Agreement dated as of November 1, 1991 (the 
"Registration Rights Agreement").

     B.   The Registration Rights Agreement was amended and restated pursuant 
to that certain Amended and Restated Registration Rights Agreement dated as 
of November 5, 1993 among the Series A Purchasers, the Founder and Daiichi 
(the "First Restated Registration Rights Agreement").

     C.   The First Restated Registration Rights Agreement was amended by an 
Amendment No. 1 dated February 11, 1994 (the "Amendment") to include the 
shares of Common Stock held by the Common Holders as "Registrable Securities" 
for certain purposes of the First Restated Registration Rights Agreement.

     D.   The First Registration Rights Agreement was amended and restated 
pursuant to an Amended and Restated Registration Rights Agreement dated 
November 23, 1994 to include certain additional securities as "Registrable 
Securities" thereunder (the "Second Restated Registration Rights Agreement").

     E.   The Second Registration Rights Agreement was amended by Amendment 
No. 1 thereto dated February 11, 1994, an Amendment dated January 3, 1995, 
Amendment No. 2 dated March 20, 1995 and Amendment No. 3 dated October 17, 
1995.

     F.   The Parties desire to amend and restate the Second Restated 
Registration Rights Agreement to (i) include Abbott as a "Holder" thereunder 
and up to 625,000 shares of Common Stock issuable upon exercise of Warrants 
issued or which may be issued to Abbott (the "Abbott Warrants") as 
"Registrable Securities" hereunder; (ii) include shares of Common Stock 
issuable upon exercise of Warrants to purchase an aggregate of 69,471 shares 
of Common Stock issued to the Series A Purchasers as of July 31, 1995 in 
connection with the extension of the repayment of certain 


<PAGE>

bridge financing loans issued in 1993 and 1994 as Registrable Securities 
hereunder; and (iii) reflect the current facts and circumstances following 
the completion of the Company's initial public offering completed on October 
17, 1995.

     NOW THEREFORE, in consideration of the mutual agreements, covenants and 
conditions and releases contained herein, the Company, the Common Holders and 
each of the Holders hereby agree as follows:

                                   SECTION 1.


                               REGISTRATION RIGHTS


     The Company hereby grants to each of the Holders and the Common Holders 
the registration rights set forth in this Section 1, with respect to the 
Registrable Securities and/or Piggyback Registrable Securities (as 
hereinafter defined) owned by the Holders or the Common Holders, as 
applicable.  The Company, the Holders and the Common Holders agree that the 
registration rights provided herein set forth the sole and entire agreement 
on the subject matter between the Company, the Holders and the Common Holders.

     1.1  DEFINITIONS.  As used in this Section 1:


          (a)  The terms "register", "registered", and "registration" refer 
to a registration effected by filing with the Securities and Exchange 
Commission (the "SEC") a registration statement (the "Registration 
Statement") in compliance with the Securities Act of 1933, as amended (the 
"1933 Act") and the declaration or ordering by the SEC of the effectiveness 
of such Registration Statement.

          (b)  The term "Registrable Securities" means (i) 1,410,295 shares 
of Common Stock held by the Founder, (ii) 2,375,854 shares of Common Stock 
held by Series A Purchasers in the respective amounts on the date hereof as 
set forth in Exhibit 2 attached hereto; (iii) 462,857 shares of Common Stock 
held by Daiichi issued upon conversion of the Debenture, (iv) 35,145 shares 
of Common Stock held by Mallinckrodt issued upon conversion of shares of 
Series C Preferred Stock; (v) Common Stock issued or issuable upon exercise 
of the Abbott Warrants initially exercisable into an aggregate of up to 
625,000 shares of Common Stock; (vi) Common Stock issued or issuable upon 
exercise of those certain Warrants exercisable into an aggregate of 316,295 
shares of Common Stock held by the Founder and certain of the Holders in the 
respective amounts set forth in Exhibit 3 attached hereto; and (vii) any 
Common Stock of the Company issued as (or issuable upon the conversion or 
exercise of any warrant, right, or other security that is issued as) a 
dividend or other distribution with respect to, or in exchange or in 
replacement of, such Registrable Securities (as defined in clauses (i), (ii), 
(iii), (iv), (v) and (vi).  In the event of any recapitalization by the 
Company, whether by stock split, reverse stock split, stock dividend or the 
like, the number of shares of Registrable Securities used throughout this 
Agreement for various purposes shall be proportionately increased or 
decreased.

          (c)  The term "Piggyback Registrable Securities" means (i) 
Registrable Securities; (ii) 595,308 shares of Common Stock held by the 
Common Holders as set forth on Exhibit 1; and (iii) the 549,410 shares of 
Common Stock held by Guerbet.  In the event of any recapitalization by the 
Company, whether by stock split, reverse stock split, stock dividend or the 
like, the number of 

                                     2
<PAGE>

shares of Piggyback Registrable Securities used throughout this Agreement for 
various purposes shall be proportionately increased or decreased.

          (d)  The term "Initiating Holders" means any Holder or Holders of 
not less than fifty percent (50%) of the Registrable Securities held by all 
of the Holders then outstanding and not registered at the time of any request 
for registration pursuant to paragraph 1.2 of this Agreement.

          (e)  The term "Piggyback Holders" means the holders of Piggyback 
Registrable Securities.

     1.2  DEMAND REGISTRATION.

          (a)  DEMAND FOR REGISTRATION.  If the Company shall receive from 
Initiating Holders a written demand (a "Demand Registration") that the 
Company effect any registration under the 1933 Act of all or part of the 
Registrable Securities (other than a registration on Form S-3 or any related 
form of registration statement, such a request being provided for under 
paragraph 1.9 hereof) the Company will:

               (i)  promptly (but in any event within 10 days) give written 
notice of the proposed registration to all other Holders; and

               (ii) use its best efforts to effect such registration as soon 
as practicable as may be so demanded and as will permit or facilitate the 
sale and distribution of all or such portion of such Initiating Holders' 
Registrable Securities as are specified in such demand, together with all or 
such portion of the Registrable Securities of any Holder or Holders joining 
in such demand as are specified in a written demand received by the Company 
within 30 days after such written notice is given, provided that the Company 
shall not be obligated to take any action to effect any such registration, 
pursuant to this paragraph 1.2:

                    (A)  Within 120 days immediately following the effective
     date of any registration statement pertaining to an underwritten public
     offering of securities of the Company for its own account (other than a
     registration on Form S-4 relating solely to an SEC Rule 145 transaction, 
     or a registration relating solely to employee benefit plans);

                    (B)  After the Company has effected an aggregate of two 
     such registrations pursuant to this paragraph 1.2 and the sales of the 
     shares of Common Stock under such registrations have closed;


                    (C)  If the Company shall furnish to such Holders a
     certificate signed by the President of the Company, stating that in the
     good faith judgment of the board of directors of the Company it would be
     seriously detrimental to the Company and its shareholders for such
     Registration Statement to be filed at the date filing would be required, 
     in which case the Company shall have an additional period of not more than
     90 days within which to file such Registration Statement; provided, 
     however, that the Company shall not use this right more than once in any 
     twelve month period;


                    (D)  If the Demand Registration covers less than 30 percent
     of Registrable Securities held by all of the Holders and the proposed
     aggregate offering price 

                                     3
<PAGE>


     to the public of the Registrable Securities to be  included in the 
     registration by all Holders, is less than $5,000,000; or

                    (E)  Prior to October 17, 1996.

          (b)  UNDERWRITING.  If the Initiating Holders intend to distribute 
the Registrable Securities covered by their demand by means of an 
underwriting, they shall so advise the Company as part of their demand made 
pursuant to this paragraph 1.2; and the Company shall include such 
information in the written notice referred to in subparagraph 1.2(a)(i).  In 
such event, the right of any Holder to registration pursuant to this 
paragraph 1.2 shall be conditioned upon such Holder's participation in such 
underwriting and the inclusion of such Holder's Registrable Securities in the 
underwriting (unless otherwise mutually agreed by a majority in interest of 
the Initiating Holders and such Holder) to the extent provided herein.

     The Company shall, together with all Holders proposing to distribute 
their securities through such underwriting, enter into an underwriting 
agreement in customary form with the underwriter or underwriters selected by 
a majority in interest of the Initiating Holders and reasonably satisfactory 
to the Company. Notwithstanding any other provision of this paragraph 1.2, if 
the underwriter shall advise the Company in writing that marketing factors 
(including, without limitation, an adverse effect on the per share offering 
price) require a limitation of the number of shares to be underwritten, then 
the Company shall so advise all Holders of Registrable Securities that would 
otherwise be registered and underwritten pursuant hereto, and the number of 
shares of Registrable Securities that may be included in the registration and 
underwriting shall be allocated pro rata among such Holders thereof in 
proportion, as nearly as practicable, to the respective amounts of 
Registrable Securities held by such Holders at the time of filing the 
registration statement.  For purposes of any underwriter cutback, all 
Registrable Securities held by any Holder which is a partnership or 
corporation shall also include any Registrable Securities held by the 
partners, retired partners, shareholders or affiliated entities of such 
Holder, or the estates and family members of any such partners and retired 
partners and any trusts for the benefit of any of the foregoing persons, and 
such Holder and other persons shall be deemed to be a single "selling 
Holder", and any pro rata reduction with respect to such "selling Holder" 
shall be based upon the aggregate amount of shares carrying registration 
rights owned by all entities and individuals included in such "selling 
Holder", as defined in this sentence.  No Registrable Securities excluded 
from the underwriting by reason of the underwriter's marketing limitation 
shall be included in such registration.

     If any Holder disapproves of the terms of the underwriting, such Holder 
may elect to withdraw therefrom by written notice to the Company, the 
underwriter, and the Initiating Holders.  The Registrable Securities so 
withdrawn shall also be withdrawn from registration.

     If the underwriter has not limited the number of Registrable Securities 
to be underwritten, the Company may include securities for its own account 
(or for the account of other shareholders) in such registration if the 
underwriter so agrees and if the number of Registrable Securities that would 
otherwise have been included in such registration and underwriting will not 
thereby be limited.


                                     4
<PAGE>

     1.3  COMPANY REGISTRATION.


          (a)  If at any time or from time to time the Company shall 
determine to register any of its securities, either for its own account or 
the account of security holders, other than a registration relating solely to 
employee benefit plans, a registration on Form S-4 relating solely to an SEC 
Rule 145 transaction, or a registration pursuant to paragraph 1.2 hereof, the 
Company will:

               (i)  promptly give to the Piggyback Holders written notice 
thereof (which shall include a list of the jurisdictions in which the Company 
intends to attempt to qualify such securities under the applicable blue sky 
or other state securities laws); and

               (ii) include in such registration (and any related 
qualification under blue sky laws or other compliance), and in any 
underwriting involved therein, all the Piggyback Registrable Securities 
specified in a written request or requests, made within 20 days after receipt 
of such written notice from the Company, by the Piggyback Holders, except as 
set forth in subparagraph 1.3(b) below.

          (b)  UNDERWRITING.  If the registration of which the Company gives 
notice is for a registered public offering involving an underwriting, the 
Company shall so advise the Piggyback Holders as a part of the written notice 
given pursuant to subparagraph 1.3(a)(i).  In such event, the right of the 
Piggyback Holders to registration of his or its Piggyback Registrable 
Securities pursuant to this paragraph 1.3 shall be conditioned upon the 
Piggyback Holder's participation in such underwriting and the inclusion of 
the Piggyback Holder's Piggyback Registrable Securities in the underwriting 
to the extent provided herein.  The Piggyback Holders proposing to distribute 
their securities through such underwriting shall, together with the Company 
and the other parties distributing their securities through such 
underwriting, enter into an underwriting agreement in customary form with the 
underwriter or underwriters selected for such underwriting by the Company.  
Notwithstanding any other provision of this paragraph 1.3, if the underwriter 
determines that marketing factors require a limitation of the number of 
shares to be underwritten, the underwriter may limit the number of Piggyback 
Registrable Securities to be included in the registration and underwriting, 
or may exclude Piggyback Registrable Securities entirely from such 
registration and underwriting subject to the terms of this paragraph; 
provided, however, for any registration, the limitation shall not reduce the 
number of Piggyback Registrable Securities to be included in the offering 
below thirty percent (30%) of the total number of shares to be included in 
the offering unless the holders of at least a majority of Piggyback 
Registrable Securities then outstanding otherwise consent to or approve the 
limitation of the number of shares to be underwritten.  The Company shall so 
advise all holders of the Company's securities that would otherwise be 
registered and underwritten pursuant hereto, and the number of shares of such 
securities, including Piggyback Registrable Securities, that may be included 
in the registration and underwriting shall be allocated in the following 
manner: shares, other than Piggyback Registrable Securities, requested to be 
included in such registration by shareholders shall be excluded, and if a 
limitation on the number of shares is still required, the number of Piggyback 
Registrable Securities that may be included shall be allocated among the 
Piggyback Holders thereof in proportion, as nearly as practicable, to the 
respective amounts of Piggyback Registrable Securities held by the Piggyback 
Holders at the time of filing the Registration Statement.  For purposes of 
any underwriter cutback, all Piggyback Registrable Securities held by any 
Piggyback Holder which is a partnership or corporation shall also include any 
Piggyback Registrable Securities held by the partners, retired partners, 
shareholders or affiliated entities of such Piggyback Holder or the estates 
and family 
                                     5
<PAGE>

members of any such partners and retired partners and any trusts 
for the benefit of any of the foregoing persons, and such Piggyback Holder 
and other persons shall be deemed to be a single "selling Holder", and any 
pro rata reduction with respect to such "selling Piggyback Holder" shall be 
based upon the aggregate amount of shares carrying registration rights owned 
by all entities and individuals included in such "selling Piggyback Holder," 
as defined in this sentence.  No securities excluded from the underwriting by 
reason of the underwriter's marketing limitation shall be included in such 
registration.  If any Piggyback Holder disapproves of the terms of the 
underwriting, it may elect to withdraw therefrom by written notice to the 
Company and the underwriter.  The Piggyback Registrable Securities so 
withdrawn shall also be withdrawn from registration.

          (c)  TERMINATION OF REGISTRATION RIGHTS.  No Piggyback Holder shall 
be entitled to exercise any right provided for in this Section 1.3 after 
October 17, 1998.

     1.4  EXPENSES OF REGISTRATION.  All expenses incurred in connection with 
the first two registrations effected pursuant to paragraph 1.2 and all 
registrations effected pursuant to paragraphs 1.3 and 1.9, including without 
limitation all registration, filing, and qualification fees (including blue 
sky fees and expenses), printing expenses, escrow fees, fees and 
disbursements of counsel for the Company and of one special counsel for the 
participating Holders and the Common Holders, and expenses of any special 
audits incidental to or required by such registration, shall be borne by the 
Company; provided, however, that the Company shall not be required to pay 
stock transfer taxes or underwriters' discounts, or commissions relating to 
Registrable Securities or Piggyback Registrable Securities.  Notwithstanding 
anything to the contrary above, the Company shall not be required to pay for 
any expenses of any registration proceeding under paragraph 1.2 if the 
registration request is subsequently withdrawn at the request of the Holders 
of a majority of the Registrable Securities to have been registered, unless 
such Holders agree to forfeit their right to a demand registration pursuant 
to paragraph 1.2 (in which event such right shall be forfeited by all 
Holders).  In the absence of such an agreement to forfeit, the Holders of 
Registrable Securities to have been registered shall bear all such expenses 
pro rata on the basis of the Registrable Securities to have been registered.  
Notwithstanding the preceding sentence, however, if at the time of the 
withdrawal, the Holders have learned of a material adverse change in the 
condition, business, or prospects of the Company from that known to the 
Holders at the time of their request, of which the Company had knowledge at 
the time of the request, then the Holders shall not be required to pay any of 
said expenses and shall retain their rights pursuant to paragraph 1.2.

     1.5  OBLIGATIONS OF THE COMPANY.  Whenever required under this Section 1 
to effect the registration of any Registrable Securities or Piggyback 
Registrable Securities the Company shall, as expeditiously as reasonably 
possible:

          (a)  Prepare and file with the SEC a registration statement with 
respect to such Registrable Securities or Piggyback Registrable Securities 
and use its diligent best efforts to cause such registration statement to 
become effective, and keep such registration statement effective for up to 
ninety (90) days or until the Holders and the Common Holders have completed 
the distribution relating thereto.

          (b)  Prepare and file with the SEC such amendments and supplements 
to such registration statement and the prospectus used in connection with 
such registration statement as may be necessary to comply with the provisions 
of the 1933 Act with respect to the disposition of all securities covered by 
such registration statement.

                                     6
<PAGE>

          (c)  Furnish to the Holders and the Common Holders such numbers of 
copies of a prospectus, including a preliminary prospectus, in conformity 
with the requirements of the 1933 Act, and such other documents as they may 
reasonably request in order to facilitate the disposition of Registrable 
Securities or Piggyback Registrable Securities owned by them.

          (d)  Use its best efforts to register and qualify the securities 
covered by such registration statement under such other securities or Blue 
Sky laws of such jurisdictions as shall be reasonably requested by the 
Holders and the Common Holders, provided that the Company shall not be 
required in connection therewith or as a condition thereto to qualify to do 
business or to file a general consent to service of process in any such 
states or jurisdictions.

          (e)  In the event of any underwritten public offering, enter into 
and perform its obligations under an underwriting agreement, in usual and 
customary form, with the managing underwriter of such offering.  Each Holder 
and each Common Holder participating in such underwriting shall also enter 
into and perform its obligations under such an agreement.

          (f)  Notify each holder of Registrable Securities or Piggyback 
Registrable Securities covered by such registration statement at any time 
when a prospectus relating thereto is required to be delivered under the 1933 
Act of the happening of any event as a result of which the prospectus 
included in such registration statement, as then in effect, includes an 
untrue statement of a material fact or omits to state a material fact 
required to be stated therein or necessary to make the statements therein not 
misleading in the light of the circumstances then existing.

          (g)  Furnish, at the request of the Holder or any Common Holder 
requesting registration of Registrable Securities or Piggyback Registrable 
Securities pursuant to this Section 1, on the date that such Registrable 
Securities or Piggyback Registrable Securities are delivered to the 
underwriters for sale in connection with a registration pursuant to this 
Section 1, if such securities are being sold through underwriters, on the 
date that the registration statement with respect to such securities becomes 
effective, (i) an opinion, dated such date, of the counsel representing the 
Company for the purposes of such registration, in form and substance as is 
customarily given to underwriters in an underwritten public offering, 
addressed to the underwriters, if any, and to the Holders and/or the Common 
Holders requesting registration of Registrable Securities or Piggyback 
Registrable Securities, and (ii) a letter dated such date from the 
independent accountants of the Company, in form and substance as is 
customarily given by independent accountants to underwriters in an 
underwritten public offering, addressed to the underwriters, if any, and, if 
permissible, to the Holders and/or the Common Holders requesting registration 
of Registrable Securities or Piggyback Registrable Securities.

     1.6  INDEMNIFICATION.

          (a)  The Company will, and does hereby undertake to, indemnify and 
hold harmless each Holder of Registrable Securities and each Piggyback Holder 
of Piggyback Registrable Securities, each of such Holder's or such Piggyback 
Holder's, officers, directors, partners and agents, and each person 
controlling such Holder or such Piggyback Holders, with respect to any 
registration, qualification, or compliance effected pursuant to this Section 
1, and each underwriter, if any, and each person who controls any 
underwriter, of the Registrable Securities held by or issuable to such Holder 
or such Piggyback Holder, against all claims, losses, damages, and 
liabilities (or actions in respect thereto) to which they may become subject 
under the 1933 Act, the Securities 

                                     7
<PAGE>

Exchange Act of 1934, as amended, (the "1934 Act"), or other federal or state 
law arising out of or based on (i) any untrue statement (or alleged untrue 
statement) of a material fact contained in any prospectus, offering circular, 
or other similar document (including any related Registration Statement, 
notification, or the like) incident to any such registration, qualification, 
or compliance, or based on any omission (or alleged omission) to state 
therein a material fact required to be stated therein or necessary to make 
the statements therein not misleading, or (ii) any violation or alleged 
violation by the Company of any federal, state or common law rule or 
regulation applicable to the Company in connection with any such 
registration, qualification, or compliance, and will reimburse, as incurred, 
each such Holder, each such Piggyback Holder, each such underwriter, and each 
such director, officer, partner, agent and controlling person, for any legal 
and any other expenses reasonably incurred in connection with investigating 
or defending any such claim, loss, damage, liability, or action; provided 
that the Company will not be liable in any such case to the extent that any 
such claim, loss, damage, liability or expense, arises out of or is based on 
any untrue statement or omission based upon written information furnished to 
the Company by an instrument duly executed by such Holder or such Piggyback 
Holder or underwriter and stated to be specifically for use therein.

          (b)  Each Holder and each Piggyback Holder will, if Registrable 
Securities or Piggyback Registrable Securities held by or issuable to such 
Holder or such Piggyback Holder are included in such registration, 
qualification, or compliance, severally and not jointly, indemnify the 
Company, each of its directors, and each officer who signs a Registration 
Statement in connection therewith, and each person controlling the Company, 
each underwriter, if any, and, each person who controls any underwriter, of 
the Company's securities covered by such a Registration Statement, and each 
other Holder, each other Piggyback Holder, each of such other Holder's or 
Piggyback Holder's officers, partners, directors and agents and each person 
controlling such other Holder, or such other Piggyback Holder against all 
claims, losses, damages, and liabilities (or actions in respect thereof) 
arising out of or based on any untrue statement (or alleged untrue statement) 
of a material fact contained in any such Registration Statement, prospectus, 
offering circular, or other document, or any omission (or alleged omission) 
to state therein a material fact required to be stated therein or necessary 
to make the statements therein not misleading, and will reimburse, as 
incurred, the Company, each such underwriter, each such other Holder, each 
such other Piggyback Holder, and each such director, officer, partner, and 
controlling person, for any legal or any other expenses reasonably incurred 
in connection with investigating or defending any such claim, loss, damage, 
liability, or action, in each case to the extent, but only to the extent, 
that such untrue statement (or alleged untrue statement) or omission (or 
alleged omission) was made in such Registration Statement, prospectus, 
offering circular, or other document, in reliance upon and in conformity with 
written information furnished to the Company by an instrument duly executed 
by such Holder or such Piggyback Holder and stated to be specifically for use 
therein; provided, however, that the liability of each Holder or each 
Piggyback Holder hereunder shall be limited to the net proceeds received by 
such Holder or such Piggyback Holder from the sale of securities under such 
Registration Statement.  In no event will any Holder or any Piggyback Holder 
be required to enter into any agreement or undertaking in connection with any 
registration under this Section 1 providing for any indemnification or 
contribution obligations on the part of such Holder or such Piggyback Holder 
greater than such Holder's or such Piggyback Holder's obligations under this 
paragraph 1.6.

          (c)  Each party entitled to indemnification under this paragraph 
1.6 (the "Indemnified Party") shall give notice to the party required to 
provide such indemnification (the "Indemnifying Party") of any claim as to 
which indemnification may be sought promptly after such 

                                     8
<PAGE>

Indemnified Party has actual knowledge thereof, and shall permit the 
Indemnifying Party to assume the defense of any such claim or any litigation 
resulting therefrom; provided that counsel for the Indemnifying Party, who 
shall conduct the defense of such claim or litigation, shall be subject to 
approval by the Indemnified Party (whose approval shall not be unreasonably 
withheld) and the Indemnified Party may participate in such defense with its 
separate counsel at the Indemnifying Party's expense if representation of 
such Indemnified Party would be inappropriate due to actual or potential 
differing interests between such indemnified party and any other party 
represented by such counsel in such proceeding; and provided further that the 
failure of any Indemnified Party to give notice as provided herein shall not 
relieve the Indemnifying Party of its obligations under this Section 1, 
except to the extent that such failure to give notice shall materially 
adversely affect the Indemnifying Party in the defense of any such claim or 
any such litigation.  No Indemnifying Party, in the defense of any such claim 
or litigation, shall, except with the consent of each Indemnified Party, 
consent to entry of any judgment or enter into any settlement that does not 
include as an unconditional term thereof the giving by the claimant or 
plaintiff therein, to such Indemnified Party, of a release from all liability 
in respect to such claim or litigation.

     1.7  INFORMATION BY THE HOLDERS OR THE PIGGYBACK HOLDERS.  If the Holder 
or any Piggyback Holder of Registrable Securities or Piggyback Registrable 
Securities include Registrable Securities or Piggyback Registrable Securities 
in any registration, such Holder or Piggyback Holder, shall furnish to the 
Company such information regarding such Holder or Piggyback Holder 
respectively, and the distribution proposed by such Holder or such Piggyback 
Holder, respectively, as the Company may reasonably request in writing and as 
shall be required in connection with any registration, qualification, or 
compliance referred to in this Section 1.

     1.8  TRANSFER OF REGISTRATION RIGHTS.  The rights of the Holders and the 
Piggyback Holders contained in paragraphs 1.2, 1.3 and 1.9 hereof, to cause 
the Company to register the Registrable Securities or Piggyback Registrable 
Securities, may be assigned or otherwise conveyed to a transferee or assignee 
of Registrable Securities or Piggyback Registrable Securities, who shall be 
considered a "Holder" or a "Piggyback Holder", as applicable, for purposes of 
this Section 1; provided that such transferee or assignee, (a) receives such 
securities as a partner in connection with partnership distributions of a 
Series A Purchaser or a Piggyback Holder, or (b) acquires at least 200,000 
shares (as presently constituted), or 100% of the Registrable Securities or 
Piggyback Registrable Securities held by the transferring Holder or Piggyback 
Holder, whichever is less; and, provided further, that the Company is given 
written notice by such Holder or Piggyback Holder at the time of or within a 
reasonable time after said transfer stating the name and address of said 
transferee or assignee and identifying the securities with respect to which 
such registration rights are being assigned.

     1.9  FORM S-3.  The Company shall use its best efforts to qualify for 
registration on Form S-3 and to that end the Company shall register (whether 
or not required by law to do so) its Common Stock under the 1934 Act within 
twelve (12) months following the effective date of the first registration of 
any securities of the Company on Form S-1.  After the Company has qualified 
for the use of Form S-3, the Holders of Registrable Securities shall have the 
right to request up to four (4) registrations on Form S-3 under this 
paragraph 1.9.  The Company shall give notice to all Holders of Registrable 
Securities of the receipt of a request for registration pursuant to this 
paragraph 1.9 and shall provide a reasonable opportunity for other Holders to 
participate in the registration.  Subject to the foregoing, the Company will 
use its best efforts to effect promptly the registration of all shares of 
Registrable Securities on Form S-3, as the case may be, to the extent 
requested by the Holder or 

                                    9
<PAGE>

Holders thereof for purposes of disposition; provided, however, that the 
Company shall not be obligated to effect any such registration (i) if the 
Holders, together with the holders of any other securities of the Company 
entitled to inclusion in such registration, propose to sell Registrable 
Securities and such other securities (if any) at an aggregate price to the 
public of less than $1,000,000, or (ii) more than once during any twelve (12) 
month period; or (iii) in the event that the conditions set forth in 
subparagraph 1.2(a)(ii)(C) obtain (but subject to the limitations set forth 
therein).

     1.10 DELAY OF REGISTRATION.  No Holder, nor any Piggyback Holder shall 
have any right to obtain or seek an injunction restraining or otherwise 
delaying any such registration as the result of any controversy that might 
arise with respect to the interpretation or implementation of this Section 1.

     1.11 LIMITATIONS ON SUBSEQUENT REGISTRATION RIGHTS.  From and after the 
date of this Agreement, the Company shall not, without the prior written 
consent of the holders of more than a majority of the Piggyback Registrable 
Securities, enter into any agreement with any holder or prospective holder of 
any securities of the Company which would allow such holder or prospective 
holder to (a) require the Company to effect a registration or (b) include any 
securities in any registration filed under paragraph 1.2 or 1.3 hereof, 
unless, under the terms of such agreement, such holder or prospective holder 
may include such securities in any such registration only to the extent that 
the inclusion of such securities will not diminish the amount of Registrable 
Securities or Piggyback Registrable Securities which are included in such 
registration and includes the equivalent of Section 1.13 as a term.

     1.12 RULE 144 REPORTING.  With a view to making available to the Holders 
and the Piggyback Holders the benefits of certain rules and regulations of 
the SEC which may permit the sale of the Registrable Securities and the 
Piggyback Registrable Securities to the public without registration, the 
Company agrees to use its best efforts to:

          (a)  Make and keep public information available, as those terms are 
understood and defined in SEC Rule 144 or any similar or analogous rule 
promulgated under the 1933 Act, at all times commencing ninety (90) days 
after the effective date of the first registration filed by the Company for 
an offering of its securities to the general public;

          (b)  File with the SEC, in a timely manner, all reports and other 
documents required of the Company under the 1933 Act and 1934 Act;

          (c)  So long as any Holder or any Piggyback Holder owns any 
Registrable Securities or Piggyback Registrable Securities, furnish to such 
Holder or such Piggyback Holder forthwith upon request:  a written statement 
by the Company as to its compliance with the reporting requirements of said 
Rule 144 of the 1933 Act, and of the 1934 Act (at any time after it has 
become subject to such reporting requirements); a copy of the most recent 
annual or quarterly report of the Company; and such other reports and 
documents as any Holder or any Piggyback Holder may reasonably request in 
availing itself of any rule or regulation of the SEC allowing it to sell any 
such securities without registration.

     1.13 "MARKET STAND-OFF" AGREEMENT.  Each Holder and each Piggyback 
Holder hereby agrees that during the 120-day period following the effective 
date of a registration statement of the 

                                    10
<PAGE>

Company filed under the 1933 Act, he or it shall not, to the extent requested 
by the Company and any underwriter, sell or otherwise transfer or dispose of 
(other than to donees who agree to be similarly bound) any Common Stock of 
the Company held by him or it at any time during such period except Common 
Stock included in such registration; provided, however, that:

          (a)  such agreement shall be applicable only to the first such 
registration statement of the Company which covers Common Stock (or other 
securities) to be sold on his or its behalf to the public in an underwritten 
offering; and

          (b)  all officers and directors of the Company and all other 
persons with registration rights (whether or not pursuant to this Agreement) 
enter into similar agreements.

     In order to enforce the foregoing covenant, the Company may impose 
stop-transfer instructions with respect to the Registrable Securities and/or 
Piggyback Registrable Securities of each Holder and each Piggyback Holder 
(and the shares or securities of every other person subject to the foregoing 
restriction) until the end of such period.

     1.14 AMENDMENT OF REGISTRATION RIGHTS.  Any provision of this Section 1 
may be amended and the observance thereof may be waived (either generally or 
in a particular instance and either retroactively or prospectively) only with 
the written consent of the Company and the holders of not less than a 
majority of the Piggyback Registrable Securities then outstanding.  Any 
amendment or waiver effected in accordance with this paragraph shall be 
binding upon each Holder, each Piggyback Holder, each future holder of 
Registrable Securities or Piggyback Registrable Securities, and the Company.

                                   SECTION 2.

                                COMPANY COVENANTS

     The Company hereby covenants and agrees as follows:

     2.1  BASIC FINANCIAL INFORMATION.

          (a)  So long as any Holder or any subsidiary, affiliate or partner 
of such Holder shall own at least 200,000 Registrable Securities, to furnish 
the following reports:

               (i)  As soon as practicable after the end of each fiscal year, 
and in any event within 120 days thereafter, audited consolidated balance 
sheets of the Company and its subsidiaries, if any, as at the end of such 
fiscal year, and audited consolidated statements of income and cash flows of 
the Company and its subsidiaries, if any, for such fiscal year, prepared in 
accordance with generally accepted accounting principles and setting forth in 
each case in comparative form the figures for the previous fiscal year, all 
in reasonable detail and accompanied by a report and opinion thereon, by 
independent public accountants of national reputation selected by the 
Company's board of directors and by a copy of such accountants' management 
letter prepared in connection therewith.

               (ii) As soon as practicable after the end of each of the first 
three (3) quarters of the fiscal year, but in any event within forty-five 
(45) days after the end of each such 

                                    11
<PAGE>

quarter, the Company's unaudited consolidated balance sheet as of the end of 
such quarter, and its unaudited consolidated statements of income and cash 
flows for such quarter, all in reasonable detail and prepared in accordance 
with generally accepted accounting principles and certified by the principal 
financial or accounting officer of the Company.

          (b)  The rights granted pursuant to this paragraph 2.1 may not be 
assigned or otherwise conveyed by any Holder or by any subsequent transferee 
of any such rights without the written consent of the Company, which consent 
shall not be unreasonably withheld; provided that the Company may refuse such 
written consent if the proposed transferee is a competitor of the Company; 
and provided further, that no such written consent shall be required if the 
transfer is in connection with the transfer of Common Stock to any partner or 
retired partner of any Holder that is a general or limited partnership or to 
any such partner's estate.

                                   SECTION 3.


                                  MISCELLANEOUS

     3.1  GOVERNING LAW.  This Agreement shall be governed by and construed 
under the laws of the State of Washington as applied to agreements among 
Washington residents made and to be performed entirely with the State of 
Washington.

     3.2  ENTIRE AGREEMENT; AMENDMENT.  This Agreement shall supersede and 
replace the Second Restated Registration Rights Agreement, as amended, which 
shall be terminated concurrently upon the effectiveness of this Agreement.  
This Agreement constitutes the full and entire understanding and agreement 
between the parties with respect to the subject matter hereof.  Except as 
otherwise provided in paragraph 1.14 above, this Agreement may be amended, 
waived, discharged or terminated only by written consent of the Company and 
the holders of not less than a majority of the Piggyback Registrable 
Securities.

     3.3  NOTICES.  Any notice, request or other communication required or 
permitted hereunder shall be given in writing and shall be deemed to have 
been duly given if personally delivered or if telegraphed, or mailed by 
registered or certified mail, postage prepaid, if to the Company, SONUS 
Pharmaceuticals, Inc., 22026 20th Avenue, S.E., Suite 102, Bothell, 
Washington  98021, and if to the other parties, at the respective addresses 
of the parties as set forth on the Exhibits attached hereto and shall be 
deemed to have been received when delivered.  Any party hereto may by notice 
so given change its address for future notices hereunder.

                                     12
<PAGE>


     3.4  COUNTERPARTS.  This Agreement may be executed in any number of 
counterparts, each of which shall be deemed an original, but all of which 
together shall constitute one and the same instrument.

     3.5  SEVERABILITY.  In the event that any provision of this Agreement 
becomes or is declared by a court of competent jurisdiction to be illegal, 
unenforceable or void, this Agreement shall continue in full force and effect 
without said provision.

     4.6  CAPTIONS.  The captions and headings to Sections of this Agreement 
have been inserted for identification and reference purposes only and shall 
not be used to construe the meaning or the interpretation of this Agreement.

     IN WITNESS WHEREOF, this Agreement has been duly executed and delivered 
by the parties as of the date first above written.

                                     SONUS PHARMACEUTICALS, INC.


                                     By _____________________________________
                                        Steven C. Quay, M.D., Ph.D, President


                                     HOLDERS:

                                       ______________________________________
                                       STEVEN C. QUAY, M.D., PH.D.   



                                       DAIICHI PHARMACEUTICAL CO., LTD.


                                     By _____________________________________



                                     ABBOTT LABORATORIES


                                     By _____________________________________



                                     MALLINCKRODT MEDICAL, INC.


                                     By _____________________________________


                                        13
<PAGE>

                                     CROSSPOINT VENTURE PARTNERS, III



                                     By _____________________________________
                                        Donald B. Milder, General Partner



                                     ENTERPRISE PARTNERS II, L.P.



                                     By _____________________________________
                                        Andrew E. Senyei, M.D., General Partner



                                     ENTERPRISE PARTNERS II ASSOCIATES, L.P.



                                     By _____________________________________
                                        Andrew E. Senyei, M.D., General Partner



                                      APERTURE ASSOCIATES, L.P.


                                      By:  Horsley Keogh Associates, Inc.,
                                         Its General Partner



                                     By _____________________________________
                                        N. Dan Reeve, Managing Director



                                     UTAH VENTURES

                                     By:  Utah Ventures Partners,
                                        Its General Partner



                                     By _____________________________________
                                        James C. Dreyfous, General Partner

                                   14
<PAGE>


                                     COMMON HOLDERS:


                                     GUERBET, S.A.


                                     By _____________________________________



                                     ABS EMPLOYEES VENTURE FUND
                                     LIMITED PARTNERSHIP

                                     By:  Alex. Brown Investments Incorporated,
                                          General Partner


                                     By _____________________________________
                                        Mayo A. Shattuck, III, President



                                     STRADLING, YOCCA, CARLSON & RAUTH
                                     INVESTMENT PARTNERSHIP OF 1982



                                     By _____________________________________
                                        C. Craig Carlson, Partner



                                     STRADLING, YOCCA, CARLSON & RAUTH 
                                     PROFIT SHARING PLAN


                                     By:  California Central Trust Bank,
                                           Trustee


                                     By _____________________________________

                                   15
<PAGE>


                                    EXHIBIT 1


                                 COMMON HOLDERS



     Name and Address of                              No. of Shares of
         Shareholder                                     Common Stock 

Guerbet, S.A.                                              549,410
Boite Postale 50400
95943 Roissy CDG
Cedex - France
WITH A COPY TO:
Olivier Lendowner - Manager, Legal Affairs

ABS Employees Venture Fund Limited Partnership              35,720
135 East Baltimore Street
Baltimore, Maryland  21202

Stradling, Yocca, Carlson & Rauth                            2,595
  Investment Partnership of 1982
660 Newport Center Drive, Suite 1600
Newport Beach, California  92660

Stradling, Yocca, Carlson & Rauth                            7,583
  Profit Sharing Plan
c/o California Central Trust Bank, Trustee
3080 South Bristol Street, 2nd Floor
Costa Mesa, California  92626

          TOTAL:                                          595,308
                                                         ========
                                 Exhibit 1-i

<PAGE>

                                    EXHIBIT 2


                                     HOLDERS


     Name and Address                    No. of Shares of Common Stock
                                                  625,000
Abbott Laboratories                      (Abbott currently holds a
Department 0322, AP6D                    warrant exercisable into
100 Abbott Park Road                     500,000 shares of Common
Abbott Park, Illinois 60064-3500         Stock.  Pursuant to the terms
WITH A COPY TO:                          of that certain Agreement
Lynne T. Boehringer, Esq.                dated May 14, 1996 between the
                                         Company and Abbott, Abbott may
                                         be issued an additional
                                         warrant to purchase 125,000
                                         shares of Common Stock)

Aperture Associates, L.P.                           395,976
505 Montgomery Street
San Francisco, California 
94111
WITH A COPY TO:
Alfred J. Giuffrida, Partner
Nixon, Hargrave, Devans &
Doyle
Clinton Square - P.O. Box 1051
Rochester, New York  14603

Crosspoint Venture Partners                         841,448
III
18552 MacArthur Boulevard,
Suite 400
Irvine, California  92715

Daiichi Pharmaceutical Co., Ltd.                    462,857
14-10, Nihonbashi 3-Chome
Chuo-Ku, Tokyo 103 Japan

Enterprise Partners II, L.P.                        771,328
5000 Birch Street, Suite 6200
Newport Beach, California 
92660

Enterprise Partners II Associates, L.P.              70,120
5000 Birch Street, Suite 6200
Newport Beach, California 92660

Mallinckrodt Medical, Inc.                           35,145
675 McDonnell Boulevard - P.O.Box 5840                          
St. Louis, Missouri 63134

Steven C. Quay, M.D., Ph.D.                       1,410,295
c/o SONUS Pharmaceuticals, Inc.
22026 20th Avenue, S.E., Suite 102
Bothell, Washington 98021

Utah Ventures                                       296,982
419 Wakara Way, Suite 206
Salt Lake City, Utah  84108
WITH A COPY TO:
Allan M. Wolfe, M.D.
VOXEL
26081 Merit Circle, Suite 117
Laguna Hills, California 92653

          TOTAL:                                  2,375,854
                                                  =========

                                    Exhibit 2-i

<PAGE>
                                    EXHIBIT 3


                                 WARRANT HOLDERS


                                                              No. of Warrants
                                         Warrant                to Purchase
           Holder                          No.                  Common Stock
           ------                        -------              ---------------
Crosspoint Venture Partners III                                   111,266
Enterprise Partners II, L.P.                                      101,996
Enterprise Partners II Associates, L.P.                             9,268
Aperture Associates, L.P.                                          52,358
Utah Ventures                                                      26,114
Steven C. Quay, M.D., Ph.D.                                        15,293
                                                                 --------
          TOTAL:                                                  316,295
                                                                  =======













                                Exhibit 3-i

<PAGE>
                                                                  EXHIBIT 99.3

THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED UNDER 
THE SECURITIES ACT OF 1933;  THEY HAVE BEEN ACQUIRED BY THE HOLDER FOR 
INVESTMENT AND MAY NOT BE PLEDGED, HYPOTHECATED, SOLD, TRANSFERRED OR 
OTHERWISE DISPOSED OF EXCEPT AS MAY BE AUTHORIZED UNDER THE SECURITIES ACT OF 
1933 AND THE RULES AND REGULATIONS PROMULGATED THEREUNDER.

Warrant Certificate No. 1
May 14, 1996                                                  500,000 Warrants

                           SONUS PHARMACEUTICALS, INC.

                              WARRANT CERTIFICATE

     THIS WARRANT CERTIFICATE (the "Warrant Certificate"), certifies that 
ABBOTT LABORATORIES or registered assigns (the "Holder"), is the owner of 
500,000 warrants ("Warrants"), each of which entitles the Holder hereof to 
purchase, as and when described herein one fully paid and non-assessable 
share of common stock, as such shares may be adjusted pursuant to Paragraph 
5, ("Common Stock") of SONUS PHARMACEUTICALS, INC., a Delaware corporation 
(the "Company"), at a purchase price of $16.00 per share during the term of 
this Warrant Certificate.

     1.   WARRANT.  Each Warrant entitles the Holder to purchase one fully 
paid and nonassessable share of Common Stock of the Company (such number 
being subject to adjustment as provided in Paragraph 5 hereof) on the terms 
and conditions herein set forth.

     2.   PURCHASE PRICE.  The purchase price of the shares of Common Stock 
covered by the Warrants shall be $16.00 per share, subject to adjustment as 
provided in Paragraph 5 hereof.  The purchase price of the shares of Common 
Stock as to which the Warrants shall be exercised shall be paid in full at 
the time of exercise and such consideration may consist of cash, check or 
bank draft.

     3.   TERM OF WARRANT.  The term of the Warrants shall commence on the 
date hereof and all rights to purchase shares of Common Stock hereunder shall 
cease at 11:59 P.M. on May 14, 2001, subject to earlier termination as 
provided herein.  Warrants granted hereunder may be exercised at any time 
from the date hereof until expiration hereof.  The Holder of the Warrants 
shall not have any of the rights of a stockholder with respect to the shares 
covered by the Warrants as to any shares of Common Stock not actually issued 
and delivered to it.

     4.   TRANSFERABILITY.  The Warrants shall not be transferable or 
assignable except to an Affiliate of the Holder without the prior written 
consent of the Company, which consent shall not be unreasonably withheld.  
The Holder may transfer or assign the shares of Common Stock issuable upon 
exercise of the Warrants; provided, however, that (i) a registration 
statement with respect thereto has become effective under the Securities Act; 
or (ii) in the opinion of counsel to the Holder such registration is not 
necessary; or (iii) such transfer complies with the provisions of Rule 144 
under the Securities Act of 1933, as amended (the "Securities Act").  The 
legend imprinted on the certificates pursuant to Section 10 shall be removed, 
and the Company shall issue a new certificate without such legend to the 
Holder of such security if such security is registered under the Securities 
Act or, in the opinion of counsel to the Holder such legend is no longer 
required under the Securities Act or the conditions for a permissible sale or 
transfer under Rule 144(k) have been complied with.  For purposes of this 
Warrant Certificate, "Affiliate" shall mean any wholly-owned subsidiary or 
parent of, or any corporation, entity or other person which is, within the 
meaning of the 1933 Act, controlling, controlled by or under common control 
with, the Holder or the Company, as the case may be.

<PAGE>

     5.   ADJUSTMENTS FOR STOCK SPLITS, CONSOLIDATIONS, ETC.  The purchase 
price and number and class of shares subject to this Warrant Certificate 
shall all be proportionately adjusted in the event of any change or increase 
or decrease in the number of issued shares of Common Stock in the Company, 
without receipt of consideration by the Company, which result from a split-up 
or consolidation of shares, payment of a share dividend, a recapitalization, 
combination of shares or other like capital adjustment, so that, upon 
exercise of this Warrant Certificate, the Holder shall receive the number and 
class of shares it would have received had it been the holder of the number 
of shares of Common Stock in the Company, for which this Warrant Certificate 
is being exercised, on the date of such change or increase or decrease in the 
number of issued shares of Common Stock in the Company.  If the Company shall 
reorganize, consolidate or merge with or into any other corporation where the 
Company is not the surviving entity, then each share of Common Stock shall be 
convertible into the consideration to which the shares of Common Stock 
subject to this Warrant Certificate would have been entitled to receive upon 
the effectiveness of such reorganization, merger or consolidation.  
"Affiliate" shall have the meaning set forth in Paragraph 4.  Adjustments 
under this paragraph shall be made by the Board of Directors in its 
reasonable, good faith judgment, whose determination with respect thereto 
shall be final and conclusive.  No fractional shares shall be issued under 
this Warrant Certificate or upon any such adjustment.

     6.   METHOD OF EXERCISING WARRANTS. 

          (a)  Subject to the terms and conditions of this Warrant 
Certificate, the Warrants may be exercised by surrender of the Warrant 
Certificate together with delivery to the Company at its principal office of 
a signed Subscription Agreement in the form attached hereto as Annex 1 (the 
"Subscription Agreement") specifying the number of shares to be purchased.  
Such Subscription Agreement shall be accompanied by payment in cash, check or 
bank draft, payable to the Company, equal to, in the aggregate, the full 
purchase price of such shares. The Company shall deliver a certificate or 
certificates representing the shares subject to such exercise as soon as 
practicable after the Subscription Agreement and consideration for the shares 
shall have been received by the Company, and the Holder shall be deemed a 
record holder of Common Stock upon such receipt by the Company.  All shares 
that shall be purchased upon the exercise of the Warrants as provided herein 
shall be fully paid and nonassessable.

          (b)  In addition, the Holder shall have the right, upon its written 
request delivered or transmitted to the Company together with this Warrant 
Certificate, to exchange this Warrant Certificate, in whole or in part at any 
time or from time to time on or prior to May 14, 2001, for the number of 
shares of Common Stock having an aggregate Fair Market Value (determined as 
set forth in Paragraph 6(c) below) on the date of such exchange equal to the 
difference between (1) the aggregate Fair Market Value on the date of such 
exchange of a number of shares designated by the Holder and (2) the aggregate 
exercise price the Holder would have paid to the Company to purchase such 
designated number of shares upon exercise of this Warrant Certificate.  Upon 
any such exchange, the number of shares purchasable upon exercise of this 
Warrant Certificate shall be reduced by such designated number of shares, 
and, if a balance of purchasable shares remains after such exchange, the 
Company shall execute and deliver to the Holder a new Warrant Certificate 
evidencing the right of the Holder to purchase such balance of shares.  No 
payment of any cash or other consideration shall be required.  Such exchange 
shall be effective upon the date of receipt by the Company of the original 
Warrant Certificate surrendered for cancellation and a written request from 
the Holder that the exchange pursuant to this Section be made, or at such 
later date as may be specified in such request.

                                          2

<PAGE>

          (c)  Fair market value of the Common Stock ("Fair Market Value") 
shall be determined as follows:

                (i) If the Common Stock is listed on a national securities 
exchange or admitted to unlisted trading privileges on such an exchange, or 
is listed on the Nasdaq National Market or Small Cap Market, the current Fair 
Market Value shall be the volume-weighted average price of the Common Stock 
on such exchange or Nasdaq for the ten (10) business days prior to the date 
of exchange of this Warrant; or

               (ii) If the Common Stock is not so listed or admitted to 
unlisted trading privileges or quoted on Nasdaq, the current Fair Market 
Value shall be the volume-weighted average of the mean of the last bid and 
asked prices reported for the ten (10) business days prior to the date of the 
exchange of this Warrant (1) by Nasdaq, or (2) if reports are unavailable 
under clause (i) above, by the National Quotation Bureau Incorporated; or

              (iii) If the Common Stock is not so listed or admitted to 
unlisted trading privileges and bid and asked prices are not so reported, the 
current Fair Market Value shall be determined in good faith as promptly as 
reasonably practicable by the Board of Directors.

     7.   REGISTRATION RIGHTS.  The Holder hereunder has been made a party to 
the SONUS Pharmaceuticals, Inc. Amended and Restated Registration Rights 
Agreement dated November 23, 1994, as amended ("Registration Rights 
Agreement"). The shares of Common Stock issuable upon exercise of this 
Warrant Certificate are included as "Registrable Securities" under the 
Registration Rights Agreement (as that term is defined in the Registration 
Rights Agreement) with all registration rights pertaining to such Registrable 
Securities.

     8.   GENERAL.  The Company shall at all times during the term of the 
Warrants reserve and keep available such number of shares of Common Stock as 
will be sufficient to satisfy the requirements of this Warrant Certificate, 
shall pay all original issue and transfer taxes with respect to the issue and 
transfer of shares pursuant hereto and all other fees and expenses 
necessarily incurred by the Company in connection therewith, and will from 
time to time use its best efforts to comply with all laws and regulations, 
which, in the opinion of counsel for the Company, shall be applicable thereto.

     9.   LEGENDS.  It is understood that the certificates evidencing the 
Common Stock purchased upon exercise of this Warrant Certificate may bear the 
following legend:

"THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED 
UNDER THE SECURITIES ACT OF 1933;  THEY HAVE BEEN ACQUIRED BY THE HOLDER FOR 
INVESTMENT AND MAY NOT BE PLEDGED, HYPOTHECATED, SOLD, TRANSFERRED, OR 
OTHERWISE DISPOSED OF EXCEPT AS MAY BE AUTHORIZED UNDER THE SECURITIES ACT OF 
1933, AS AMENDED, AND THE RULES AND REGULATIONS PROMULGATED THEREUNDER."

                                3

<PAGE>

     IN WITNESS WHEREOF, the Company has caused this Warrant Certificate to 
be duly executed by its officers thereunto duly authorized, all as of the day 
and year first above written.

                                   SONUS PHARMACEUTICALS, INC.



                                   By:  _______________________________

                                   Its: _______________________________
                                        

                                       4

<PAGE>

                          ANNEX I TO WARRANT CERTIFICATE

                             SUBSCRIPTION AGREEMENT


     The undersigned holder of the Warrant Certificate to which this 
Subscription Agreement is attached as Annex I hereby subscribes for ________  
shares of Common Stock which the undersigned is entitled to purchase 
pursuant to the terms of such Warrant Certificate.  Payment of the purchase 
price for the Warrants is being made concurrently herewith.

     I hereby certify that all of the shares of Common Stock, $0.001 par 
value, of SONUS PHARMACEUTICALS, INC., purchased by the undersigned pursuant 
to the exercise on this date of the Warrants granted to the undersigned by 
the Warrant Certificate are being acquired by the undersigned for investment 
and not with a view to the distribution thereof.

Date: __________________________

                                   _________________________________________
                                   Signature


                                   _________________________________________
                                   Type or Print Name


                                   _________________________________________
                                   Street Address


                                   _________________________________________
                                   City                State       Zip Code



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