WATSON PHARMACEUTICALS INC
SC 13D, 1998-11-10
PHARMACEUTICAL PREPARATIONS
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<PAGE>
 
                                 UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C.  20549

                                 SCHEDULE 13D

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


                                TheraTech, Inc.
- --------------------------------------------------------------------------------
                                (Name of Issuer)

                    Common Stock, $0.01 par value per share
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                   88338810
- --------------------------------------------------------------------------------
                                (CUSIP Number)

                               Robert C. Funsten
                         Vice President, Legal Affairs
                         Watson Pharmaceuticals, Inc.
                               311 Bonnie Circle
                           Corona, California 91720
                                (909) 270-1400
- --------------------------------------------------------------------------------
     (Name, Address and Telephone Number of Person Authorized to Receive 
                          Notices and Communications)

                               October 23, 1998
- --------------------------------------------------------------------------------
            (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 (S)240.13d-1(e), (S)240.13d-1(f) or (S)240.13d-1(g), check
the following box /  /.

Note. Schedules filed in paper format shall include a signed original and five
copies, including all exhibits.  See Rule 13d-7 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).

                                  Page 1 of 8

<PAGE>

                                 SCHEDULE 13D
- -----------------------                                  
  CUSIP NO. 88338310
- -----------------------                                  
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                          
      Watson Pharmaceuticals, Inc. ("Watson") 
      95-3872914
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [_]
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 
- ------------------------------------------------------------------------------
      SOURCE OF FUNDS*
 4    
      00
- ------------------------------------------------------------------------------
      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT 
      TO ITEMS 2(d) or 2(e) [_]
 5    
- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 6    
      a Nevada Corporation
- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     7     
     NUMBER OF            
                             
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      8    
                          5,058,462
     OWNED BY                    
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     9     
    REPORTING             
                         
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          10   
                          5,058,462
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
11    
      5,058,462
      
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
12                  
      [_]
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
13    
      23.5%            
- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
14
      CO
- ------------------------------------------------------------------------------
           
                                  Page 2 of 8

<PAGE>
 
Item 1.   Security and Issuer.

     This statement on Schedule 13D ("Schedule 13D") relates to the shares of
common stock, $0.01 par value per share ("Common Stock"), of TheraTech, Inc., a
Delaware corporation ("TheraTech"), with principal executive offices located at
417 Wakara Way, Salt Lake City, Utah 84108.
 
Item 2.   Identity and Background.

     This Schedule 13D is filed on behalf of Watson Pharmaceuticals, Inc., a
Nevada corporation ("Watson"). This Schedule 13D also includes information with
respect to the executive officers and directors of Watson (the "Control
Persons").

     (a)-(c), (f)

Watson Pharmaceuticals, Inc., a Nevada Corporation
311 Bonnie Circle
Corona, California 91720

Watson is engaged in the development, production, marketing and distribution of
off-patent branded pharmaceutical products.

Allen Chao, Ph.D, a United States citizen
Watson Pharmaceuticals, Inc.
311 Bonnie Circle
Corona, California 91720

Dr. Allen Chao is the Chief Executive Officer, President and Chairman of the
Board of Watson.

David C. Hsia, Ph.D, a United States citizen
Watson Pharmaceuticals, Inc.
311 Bonnie Circle
Corona, California 91720

Dr. David C. Hsia is the Senior Vice President of Scientific Affairs of Watson.

Frederick Wilkinson, a United States citizen
Watson Pharmaceuticals, Inc.
311 Bonnie Circle
Corona, California 91720

Frederick Wilkinson is a Vice President of Watson.


                                  Page 3 of 8
<PAGE>
 
Alec D. Keith, Ph.D, a United States citizen
269 Kuikahi Street
Hilo, Hawaii 96720

Dr. Alec D. Keith is a Director of Watson and has been a consultant of Watson
since July 1996, as well as Adjunct Professor of Biophysics at Pennsylvania
State University.

Michel J. Feldman, a United States citizen
D'Ancona & Pflaum
30 North LaSalle Street, Suite 2900
Chicago, Illinois 60602

Michael J. Feldman is Secretary and a Director of Watson and a partner of the
law firm of D'Ancona & Pflaum, which is Watson's outside counsel.

Albert F. Hummel, a United States citizen
5276 Avenida Cantaria
P.O. Box 3407
Rancho Santa Fe, California 92067

Albert F. Hummel is a Director of Watson and a partner in Affordable Residential
Communities. In addition, Mr. Hummel is President of Pentech Pharmaceuticals,
Inc.

Michael Fedida, a United States citizen
J & J Pharmacy
Cedar Chemists, Inc.
527 Cedar Lane
Teaneck, New Jersey 07666

Michael Fedida is a Director of Watson and a registered pharmacist, consultant
and owner of retail pharmacies.

Ronald R. Taylor, a United States citizen
Enterprise Partners Venture Capital
7979 Ivanhoe Avenue
Suite 550
La Jolla, CA 92037

Ronald R. Taylor is a Director of Watson and is a consultant to Cardinal Health,
Inc.

                                  Page 4 of 8
<PAGE>
 
Andrew L. Turner, a United States citizen
Sun Healthcare Group, Inc.
101 Sun Lane N.E.
Albuquerque, NM 87109

Andrew L. Turner is a Director of Watson and Chairman and Chief Executive
Officer of Sun Healthcare Group, Inc.

Chato Abad, a United States citizen
Watson Pharmaceuticals, Inc.
311 Bonnie Circle
Corona, California 91720

Chato Abad is the Vice President of Finance of Watson.
 
Michael E. Boxer, a United States citizen
Watson Pharmaceuticals, Inc.
311 Bonnie Circle
Corona, California 91720

Michael E. Boxer is the Chief Financial Officer of Watson.

Robert C. Funsten, a United States citizen
Watson Pharmaceuticals, Inc.
311 Bonnie Circle
Corona, California 91720

Robert C. Funsten is the Vice President, Legal Affairs of Watson.

     (d)  During the last 5 years, neither Watson nor any of the Control Persons
have been convicted in a criminal proceeding (excluding traffic or similar
misdemeanors).

     (e)  During the last 5 years, neither Watson nor any of the Control Persons
have 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.

     Each of Dinesh C. Patel ("Patel") and William I. Higuchi ("Higuchi"),
pursuant to their respective voting agreements dated as of October 23, 1998
(each a "Voting Agreement"), attached hereto as Exhibits A and B respectively,
and hereby incorporated by reference as though


                                  Page 5 of 8
<PAGE>
 
fully set forth herein, granted Watson certain voting rights with respect to
their Common Stock, in consideration of Watson's execution of that certain
Agreement and Plan of Merger, dated as of October 23, 1998 (the "Merger
Agreement") among Watson, TheraTech and Jazz Merger Corp., a wholly owned
subsidiary of Watson ("Watson Sub"), previously filed by TheraTech with the
Securities and Exchange Commission (the "Commission") as an exhibit to its
Report on Form 8-K on October 28, 1998, and hereby incorporated by reference as
though fully set forth herein.

Item 4.   Purpose of the Transaction.

     As of October 23, 1998, Watson, Watson Sub and TheraTech entered into the
Merger Agreement, pursuant to which TheraTech agreed to merge with Watson Sub
with TheraTech being the surviving corporation of the merger (the "Merger").
Pursuant to the terms of the Merger Agreement, (a) as consideration for the
Merger, each share of Common Stock will be converted into the right to receive a
portion of a share of common stock, $0.0033 par value per share, of Watson
("Watson Common Stock"). Upon consummation of the Merger, (a) Watson intends to
own all outstanding shares of Common Stock; (b) the board of directors of
TheraTech shall consist of one member appointed by Watson; (c) only 3,000 shares
of Common Stock shall be issued and outstanding and owned by Watson; (d) the
Certificate of Incorporation and by-laws of Watson Sub shall become the
Certificate of Incorporation and by-laws of TheraTech; (e) the Common Stock
shall be delisted from trading on the Nasdaq National Market, and (f) the Common
Stock shall cease to be registered under the Exchange Act.

     Pursuant to the Voting Agreements, each of Patel and Higuchi agreed (i) not
to sell, transfer, pledge, assign or otherwise dispose of, or enter into any
agreement, option or other arrangement or understanding with respect to the
sale, transfer, pledge, assignment or other disposition of the Common Stock that
they hold to any person other than Watson or Watson's designee; (ii) to grant
irrevocable proxies to, and appoint any individual who shall be designated by
Watson, their proxy and attorney-in-fact to vote their Common Stock at any
meeting of the stockholders of TheraTech in any circumstance where their vote,
consent, or other approval is sought in favor of the Merger, the adoption by
TheraTech of the Merger Agreement and the approval of the other transactions
contemplated by the Merger Agreement and the calling of a special meeting of
stockholders to consider any of the foregoing, and against any alternative
proposal or frustrating transaction; and (iii) to vote in favor of the Merger
Agreement at any meeting of the TheraTech stockholders called to vote upon the
Merger Agreement or vote against any other proposal or frustrating transaction.
Consequently, the primary purpose of entering into the Voting Agreements was to
enhance Watson's ability to gain control of TheraTech through the Merger.

Item 5.   Interest in the Securities of the Issuer.

     (a)-(b).  The ownership percentages are computed based on a total of
21,289,262 shares of Common Stock outstanding on September 30, 1998.


                                  Page 6 of 8
<PAGE>
 
     Pursuant to the Voting Agreements, Watson possesses the indirect beneficial
ownership of 5,058,462 shares (23.5% of the total number of shares of Common
Stock outstanding) of Common Stock and has the shared power to vote and direct
the vote and the shared power to dispose and direct the disposition of such
shares. Watson's beneficial ownership includes 4,837,461 shares of Common Stock
and the rights to acquire 221,001 shares of Common Stock by Patel, which if
acquired, would be subject to the Voting Agreement attached hereto as Exhibit B.

     (c)  Except for those shares acquired and disclosed herein, neither Watson
nor any of the Control Persons, have acquired beneficial ownership of any Common
Stock within the last sixty (60) days.

     (d)  Not Applicable.

     (e)  Not Applicable.

Item 6.   Contracts, Arrangements, Understandings or relationships with Respect
          to Securities of the Issuer.

     The terms of the Merger Agreement, previously filed by TheraTech with the
Commission as an exhibit to its Report on Form 8-K filed on October 28, 1998,
are hereby incorporated herein by reference as though fully set forth herein.
The terms of the Voting Agreements, attached as Exhibit A and Exhibit B to this
Schedule 13D, are hereby incorporated herein by reference as though fully set
forth herein.

Item 7.   Material to be Filed as Exhibits.
 
     Copies of the written agreements relating to the acquisition of the
Securities, contracts, arrangements and understandings have been identified in
Item 6 above and are attached or incorporated by reference as already herein
specified.

1.   "Exhibit A" is the Voting Agreement dated as of October 23, 1998 between
     Watson and Patel.
2.   "Exhibit B" is the Voting Agreement dated as of October 23, 1998 between
     Watson and Higuchi.
3.   The Agreement and Plan of Merger, dated as of October 23, 1998, among
     Watson, Jazz Merger Corp. and TheraTech was previously filed by TheraTech
     with the Commission as an exhibit to its Report on Form 8-K filed on
     October 28, 1998, and is hereby incorporated herein by reference.


                                  Page 7 of 8
<PAGE>
 
                                   SIGNATURE

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

Dated: November 10, 1998
                                       Watson Pharmaceuticals, Inc.


                                       By:  /s/ Robert C. Funsten
                                          -----------------------------------
                                            Robert C. Funsten
                                            Vice President, Legal Affairs


                                  Page 8 of 8

<PAGE>
 
                                   Exhibit A

                               VOTING AGREEMENT

     VOTING AGREEMENT, dated as of October 24, 1998, between Watson
Pharmaceuticals, Inc., a Nevada corporation ("Parent"), and Dinesh C. Patel,
Ph.D. (the "Stockholder").

     WHEREAS, Parent and Theratech, Inc., a Delaware corporation (the
"Company"), propose to enter into an Agreement and Plan of Merger, dated the
date hereof (as the same may be amended or supplemented, the "Merger Agreement")
providing for the merger of Jazz Merger Corp., a Delaware corporation and 
wholly-owned subsidiary of Parent ("Subsidiary"), with the Company (the
"Merger");

     WHEREAS, Stockholder is the record and beneficial owner of 2,687,926/*/
shares of common stock, par value $.01 per share, of the Company (the "Company
Common Stock"); such securities, as they may be adjusted by stock dividend,
stock split, recapitalization, combination or exchange of shares, merger,
consolidation, reorganization or other change or transaction of or by the
Company, together with securities that may be acquired after the date hereof by
Stockholder, including Company Common Stock issuable upon the exercise of
options to purchase Company Common Stock (as the same may be adjusted as
aforesaid), being collectively referred to herein as the "Securities"; and

     WHEREAS, as a condition to their willingness to enter into the Merger
Agreement, Parent and Subsidiary have requested that the Stockholder enter into
this Agreement. Capitalized terms not otherwise defined herein shall have the
meanings ascribed to them in the Merger Agreement;

     NOW, THEREFORE, to induce Parent and Subsidiary to enter into, and in
consideration of them entering into, the Merger Agreement, and in consideration
of the premises and the representations, warranties and agreements contained
herein and intending to be legally bound hereby, the parties hereby agree as
follows:

1.   Covenants of the Stockholder.  Stockholder agrees as follows:

     (a)  Stockholder shall not, except as contemplated by the terms of this
          Agreement, (i) sell, transfer, pledge, assign or otherwise dispose of,
          or enter into any agreement, option or other arrangement (including
          any profit sharing arrangement) or understanding with respect to the
          sale, transfer, pledge, assignment or other

- -------------------
     /*/  A portion of these shares are pledged to secure borrowings by Dr.
          Patel. Dr. Patel has retained voting rights on the pledged shares. In
          addition, Dr. Patel holds options to purchase 175,002 shares.


<PAGE>
 
          disposition of, the Securities to any person other than Parent or
          Parent's designee; (ii) enter into any voting arrangement, whether by
          proxy, voting agreement, voting trust, power-of-attorney or otherwise,
          with respect to the Securities or (iii) take any other action that
          would in any way restrict, limit or interfere with the performance of
          its obligations hereunder or the transactions contemplated hereby;
          provided, however, that any Stockholder that is an individual may
          transfer all or any part of his or her Securities to any sibling or
          any other member of his or her immediate family, any of his or her
          lineal descendants or any trust for the benefit of any of them, if the
          recipient of the Securities agrees in advance in writing delivered to
          Parent to be bound by this Agreement.

     (b)  Subject to Section 9 hereof, except as specifically provided in the
          Merger Agreement, until the Merger is consummated or the Merger
          Agreement is terminated, the Stockholder shall not, nor shall the
          Stockholder permit any investment banker, financial adviser, attorney,
          accountant or other representative or agent acting on behalf of or at
          the direction of the Stockholder (a "Stockholder Representative") to,
          directly or indirectly (i) solicit, initiate or encourage (including
          by way of furnishing information), or take any other action designed
          or reasonably likely to facilitate, any inquiries or the making of any
          proposal which constitutes, or may reasonably be expected to lead to,
          any Alternative Proposal (as defined in the Merger Agreement) or (ii)
          participate in any discussions or negotiations regarding any
          Alternative Proposal. Without limiting the foregoing, it is understood
          that any violation of the restrictions set forth in the preceding
          sentence by a Stockholder Representative shall be deemed to be a
          violation of this Section 1(b) by the Stockholder.

     (c)  At any meeting of stockholders of the Company called to vote upon the
          Merger and the Merger Agreement or at any adjournment thereof or in
          any other circumstances upon which a vote, consent or other approval
          (including by written consent) with respect to the Merger and the
          Merger Agreement is sought from the stockholders of the Company, the
          Stockholder shall vote (or cause to be voted) Stockholder's Securities
          in favor of approving the Merger, the adoption of the Merger Agreement
          and the approval of the other transactions contemplated by the Merger
          Agreement and the calling of a special meeting of the stockholders of
          the Company to consider any of the foregoing. At any meeting of
          stockholders of the Company or at any adjournment thereof or in any
          other circumstances upon which the Stockholder's vote, consent or
          other approval is sought, Stockholder shall vote (or cause to be
          voted) Stockholder's Securities against (i) any Alternative Proposal,
          or (ii) any amendment of the Company's Certificate of Incorporation or
          by-laws or other proposal or transaction involving the Company or any
          of its subsidiaries or any motion at a meeting of stockholders of the
          Company, which amendment or other proposal or transaction or motion
          would in any manner


<PAGE>
 
          impede, frustrate, prevent or nullify, the Merger, the Merger
          Agreement or any of the other transactions contemplated by the Merger
          Agreement (collectively, "Frustrating Transactions").


2.   Grant of Irrevocable Proxy Coupled with an Interest; Appointment of Proxy.

     (a)  Stockholder hereby irrevocably grants to, and appoints, any individual
          who shall be designated by Parent, and each of them, Stockholder's
          proxy and attorney-in-fact (with full power of substitution), for and
          in the name, place and stead of such Stockholder, to vote
          Stockholder's Securities, or grant a consent or approval in respect of
          such Securities, at any meeting of stockholders of the Company or at
          any adjournment thereof or in any other circumstances upon which their
          vote, consent or other approval is sought, (i) in favor of the Merger,
          the adoption by the Company of the Merger Agreement and the approval
          of the other transactions contemplated by the Merger Agreement and the
          calling of a special meeting of the stockholders of the Company to
          consider any of the foregoing, and (ii) against any Alternative
          Proposal or Frustrating Transaction.

     (b)  Stockholder represents that any proxies heretofore given in respect of
          Stockholder's Securities are not irrevocable, and that any such
          proxies are hereby revoked.

     (c)  STOCKHOLDER HEREBY AFFIRMS THAT THE PROXY SET FORTH IN THIS SECTION 2
          IS COUPLED WITH AN INTEREST AND IS IRREVOCABLE UNTIL THE TIME SET
          FORTH IN THE LAST SENTENCE OF THIS SECTION. Stockholder hereby further
          affirms that such irrevocable proxy is given in connection with the
          execution of the Merger Agreement, and that such irrevocable proxy is
          given to secure the performance of the duties of Stockholder under
          this Agreement. Stockholder hereby ratifies and confirms all that the
          individual voting such irrevocable proxy may lawfully do or cause to
          be done by virtue hereof. Such irrevocable proxy is executed and
          intended to be irrevocable in accordance with the provisions of
          Section 212 of the Delaware General Corporate Law ("DGCL"). Such
          irrevocable proxy shall be valid until the earlier to occur of (i) one
          year from the date hereof or (ii) the termination of this Agreement in
          accordance with its terms.

3.   Representations and Warranties of the Stockholder.  Stockholder hereby
     represents and warrants to Parent as follows:

     (a)  Authorization.  The Stockholder has the legal capacity to execute,
          deliver and perform this Agreement. This Agreement constitutes a valid
          and binding obligation of the Stockholder enforceable against the
          Stockholder in accordance


<PAGE>
 
          with its terms. If the Stockholder is married and the Securities
          constitute community property under applicable law, this Agreement has
          been duly authorized, executed and delivered by, and constitutes the
          valid and binding agreement of, the Stockholder's spouse enforceable
          against such spouse in accordance with its terms.

     (b)  No Conflict.  The execution, delivery and performance by the
          Stockholder of this Agreement and the consummation of the transactions
          contemplated hereby do not and will not (i) result in any breach or
          violation of or be in conflict with or constitute a default under any
          law or agreement or arrangement to which the Stockholder is a party or
          by which the Stockholder is bound, (ii) require any filing by the
          Stockholder with or authorization by any governmental entity (other
          than 13 D/G amendments) or (iii) require any consent or other action
          by any person under, constitute a default under, or give rise to any
          right of termination, cancellation or acceleration of a loss of any
          benefit to which the Stockholder is entitled under any provision of
          any agreement or other instrument binding on the Stockholder.

     (c)  Ownership of Securities.  Stockholder's Securities and the
          certificates representing such Securities are now held by Stockholder,
          or by a nominee or custodian for the benefit of Stockholder, and the
          Stockholder has good and marketable title to such Securities, free and
          clear of any (i) liens, proxies, voting trusts or agreements,
          understandings or arrangements and (ii) pledges, restrictions, charges
          or other adverse claims of any kind or nature. Stockholder owns of
          record or beneficially no securities of the Company, or any options,
          warrants or rights exercisable for securities of the Company, other
          than the Securities set forth opposite the Stockholder's name on
          Schedule A hereto./**/

     (d)  Merger Agreement.  Stockholder understands and acknowledges that
          Parent and Subsidiary are entering into the Merger Agreement in
          reliance upon the Stockholder's execution and delivery of this
          Agreement.


4.   Further Assurances.  Stockholder will, from time to time, execute and
     deliver, or cause to be executed and delivered, such additional or further
     transfers, assignments, endorsements, consents and other instruments as
     Parent may reasonably request for the purpose of effectively carrying out
     the transactions contemplated by this Agreement and to vest the power to
     vote Stockholder's Securities as contemplated by Section 2.

- -------------------
     /**/ See page 1.


<PAGE>
 
5.   Assignment; Binding Effect. Except as set forth herein, neither this
     Agreement nor any of the rights, interests or obligations hereunder shall
     be assigned by any of the parties hereto (whether by operation of law or
     otherwise) without the prior written consent of the other parties. Subject
     to the preceding sentence, this Agreement shall be binding upon, inure to
     the benefit of, and be enforceable by, the parties hereto and their
     respective successors and assigns. Notwithstanding anything contained in
     this Agreement to the contrary, nothing in this Agreement, expressed or
     implied, is intended to confer on any person other than the parties hereto
     or their respective heirs, successors, executors, administrators and
     assigns any rights, remedies, obligations or liabilities under or by reason
     of this Agreement.


6.   Termination.  This Agreement, and all rights and obligations of the parties
     hereunder, shall terminate upon the earliest to occur of the Effective Time
     or the termination of the Merger Agreement in accordance with its terms.
     Nothing in this Section 6 shall relieve any party from liability for
     willful breach of this Agreement.


7.   Stop Transfer.  The Company agrees with, and covenants to, Parent that the
     Company shall not register the transfer of any certificate representing
     Stockholder's Securities unless such transfer is made in accordance with
     the terms of this Agreement.


8.   General Provisions.

     (a)  Expenses.  All costs and expenses incurred by Parent in connection
          with this Agreement and the transactions contemplated hereby shall be
          paid by Parent. All costs and expenses incurred by the Stockholder in
          connection with this Agreement and the transactions contemplated
          hereby shall be paid by the Company; provided, however, that Parent
          shall reimburse Stockholder, or pay for directly if practicable, any
          expenses incurred in connection with actions requested by Parent.

     (b)  Amendments.  This Agreement may not be amended except by an instrument
          in writing signed by each of the parties hereto.

     (c)  Notice.  All notices and other communications hereunder shall be in
          writing and shall be deemed given upon receipt to the parties at the
          following addresses (or at such other address for a party as shall be
          specified by like notice):

          (i)  if to Parent, to:

               Watson Pharmaceuticals, Inc.
               311 Bonnie Circle
               Corona, California 91720
               Fax: (909) 270-1429


<PAGE>
 
               Attn: Chairman & CEO

          with a copy to:

               Watson Pharmaceuticals, Inc.
               311 Bonnie Circle
               Corona, California 91720
               Fax: (909) 270-1429
               Attn: Legal Department

          ; and

          (ii)if to Stockholder, to the address set forth under the name of
          Stockholder on Schedule A attached hereto;

          with a copy to:

               Kirkland & Ellis
               153 East 53rd Street
               New York, New York 10022
               Fax: (212) 446-4900
               Attn: Stephen P. H. Johnson

     (d)  Interpretation.  When a reference is made in this Agreement to a
          Section, such reference shall be to a Section of this Agreement unless
          otherwise indicated.  The headings contained in this Agreement are for
          reference purposes only and shall not affect in any way the meaning or
          interpretation of this Agreement.  Wherever the words "include",
          "includes" or "including" are used in this Agreement, they shall be
          deemed to be followed by the words "without limitation".

     (e)  Counterparts.  This Agreement may be executed in two or more
          counterparts, all of which shall be considered one and the same
          agreement and shall become effective when two or more counterparts
          have been signed by each of the parties and delivered to the other
          parties, it being understood that all parties need not sign the same
          counterpart.

     (f)  Entire Agreement; No Third-party Beneficiaries. This Agreement
          (including the documents and instruments referred to herein) (i)
          constitutes the entire agreement and supersedes all prior agreements
          and understandings, both written and oral, among the parties with
          respect to the subject matter hereof and (ii) is not intended to
          confer upon any person other than the parties hereto any rights or
          remedies hereunder.


<PAGE>
 
     (g)  Governing Law.  This Agreement shall be governed and construed in
          accordance with the laws of the State of Delaware without regard to
          any applicable conflicts of law.

9.   Stockholder Capacity.  Stockholder signs solely in his capacity as the
     record holder and beneficial owner of, or the trustee of a trust whose
     beneficiaries are the beneficial owners of, Stockholder's Securities and
     nothing herein shall limit or affect any actions taken by Stockholder in
     his capacity as an officer or director, if applicable, of the Company to
     the extent specifically permitted by the Merger Agreement.

10.  Enforcement.  The parties agree that irreparable damage would occur in the
     event that any of the provisions of this Agreement were not performed in
     accordance with their specific terms or were otherwise breached.  It is
     accordingly agreed that the parties shall be entitled to an injunction or
     injunctions to prevent breaches of this Agreement and to enforce
     specifically the terms and provisions of this Agreement in a court of the
     United States. This being in addition to any other remedy to which they are
     entitled at law or in equity.  In addition, each of the parties hereto
     waives any right to trial by jury with respect to any claim or proceeding
     related to or arising out of this Agreement or any of the transactions
     contemplated hereby.

     STOCKHOLDER AGREES THAT, IN CONNECTION WITH ANY LEGAL SUIT OR PROCEEDING
     ARISING WITH RESPECT TO THIS AGREEMENT, IT SHALL SUBMIT TO THE JURISDICTION
     OF THE UNITED STATES DISTRICT COURT FOR THE DISTRICT OF DELAWARE AND AGREES
     TO VENUE IN SUCH COURTS.  STOCKHOLDER HEREBY APPOINTS THE SECRETARY OF THE
     COMPANY AS HIS AGENT FOR SERVICE OF PROCESS FOR PURPOSES OF THE FOREGOING
     SENTENCE ONLY.  EACH PARTY HERETO WAIVES ANY RIGHT TO JURY TRIAL IN
     CONNECTION WITH ANY SUCH SUIT OR PROCEEDING.

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

                      WATSON PHARMACEUTICALS, INC.



                      By: /s/ Robert C. Funsten
                          -------------------------------------- 
                      Name: Robert C. Funsten
                            ------------------------------------ 
                      Title: Vice President, Legal Affairs
                            ------------------------------------ 

                      STOCKHOLDER


                      /s/ Dinesh C. Patel, Ph.D.
                          -------------------------------------- 
                      Dinesh C. Patel, Ph.D.


<PAGE>
 
                                  SCHEDULE A

 
STOCKHOLDER                                                    SECURITIES HELD

Dinesh C. Patel, Ph.D.                                          2,687,926/***/




- -------------------
/***/   A portion of these shares are pledged to secure borrowings by Dr. Patel.
        Dr. Patel has retained voting rights on the pledged shares. In addition,
        Dr. Patel holds options to purchase 175,002 shares.

<PAGE>
 
                                   Exhibit B

                                VOTING AGREEMENT

     VOTING AGREEMENT, dated as of October 24, 1998, between Watson
Pharmaceuticals, Inc., a Nevada corporation ("Parent"), and William I. Higuchi
(the "Stockholder").

     WHEREAS, Parent and Theratech, Inc., a Delaware corporation (the
"Company"), propose to enter into an Agreement and Plan of Merger, dated the
date hereof (as the same may be amended or supplemented, the "Merger Agreement")
providing for the merger of Jazz Merger Corp., a Delaware corporation and
wholly-owned subsidiary of Parent ("Subsidiary"), with the Company (the
"Merger");

     WHEREAS, Stockholder is the record and beneficial owner of 2,299,034 shares
of common stock, par value $.01 per share, of the Company (the "Company Common
Stock"); such securities, as they may be adjusted by stock dividend, stock
split, recapitalization, combination or exchange of shares, merger,
consolidation, reorganization or other change or transaction of or by the
Company, together with securities that may be acquired after the date hereof by
Stockholder, including Company Common Stock issuable upon the exercise of
options to purchase Company Common Stock (as the same may be adjusted as
aforesaid), being collectively referred to herein as the "Securities"; and

     WHEREAS, as a condition to their willingness to enter into the Merger
Agreement, Parent and Subsidiary have requested that the Stockholder enter into
this Agreement.  Capitalized terms not otherwise defined herein shall have the
meanings ascribed to them in the Merger Agreement;

     NOW, THEREFORE, to induce Parent and Subsidiary to enter into, and in
consideration of them entering into, the Merger Agreement, and in consideration
of the premises and the representations, warranties and agreements contained
herein and intending to be legally bound hereby, the parties hereby agree as
follows:

1.   Covenants of the Stockholder.  Stockholder agrees as follows:

     (a)  Stockholder shall not, except as contemplated by the terms of this
          Agreement, (i) sell, transfer, pledge, assign or otherwise dispose of,
          or enter into any agreement, option or other arrangement (including
          any profit sharing arrangement) or understanding with respect to the
          sale, transfer, pledge, assignment or other disposition of, the
          Securities to any person other than Parent or Parent's designee; (ii)
          enter into any voting arrangement, whether by proxy, voting agreement,
          voting trust, power-of-attorney or otherwise, with respect to the
          Securities or (iii) take any other action that would in any way
          restrict, limit or interfere with the performance of its obligations
          hereunder or the transactions contemplated hereby;


<PAGE>
 
          provided, however, that any Stockholder that is an individual may
          transfer all or any part of his or her Securities to any sibling or
          any other member of his or her immediate family, any of his or her
          lineal descendants or any trust for the benefit of any of them, if the
          recipient of the Securities agrees in advance in writing delivered to
          Parent to be bound by this Agreement.  Notwithstanding subsection (i)
          above, Stockholder may sell up to 65,000 shares of Company Common
          Stock for the limited purpose of satisfying any cash settlement of, or
          the unwinding of, his "zero-cost collar" arrangement which expires on
          March 9, 1999, as identified on Stockholder's Form 4 for March, 1998,
          filed with the Securities and Exchange Commission on April 10, 1998,
          if Stockholder has complied with the following: (x) Stockholder has
          complied with all legal obligations in order to sell such shares,
          including without limitation, compliance with all applicable
          securities laws and regulations, compliance with all insider trading
          legislation and policies and receipt of an opinion of counsel
          authorizing such sale, if necessary, and (y) Stockholder has provided
          Parent with at least ten (10) days prior written notice of his
          intention to sell such shares, with appropriate documentation
          evidencing compliance with (x) above, such documentation to be
          reasonably acceptable to Parent, and (z) such sale does not in any way
          jeopardize or otherwise alter the pooling of interest accounting
          treatment of the Merger, as determined in the sole discretion of
          Parent.

     (b)  Except as specifically provided in the Merger Agreement, until the
          Merger is consummated or the Merger Agreement is terminated, the
          Stockholder shall not, nor shall the Stockholder permit any investment
          banker, financial adviser, attorney, accountant or other
          representative or agent acting on behalf of or at the direction of the
          Stockholder (a "Stockholder Representative") to, directly or
          indirectly (i) solicit, initiate or encourage (including by way of
          furnishing information), or take any other action designed or
          reasonably likely to facilitate, any inquiries or the making of any
          proposal which constitutes, or may reasonably be expected to lead to,
          any Alternative Proposal (as defined in the Merger Agreement) or (ii)
          participate in any discussions or negotiations regarding any
          Alternative Proposal.  Without limiting the foregoing, it is
          understood that any violation of the restrictions set forth in the
          preceding sentence by a Stockholder Representative shall be deemed to
          be a violation of this Section 1(b) by the Stockholder.

     (c)  At any meeting of stockholders of the Company called to vote upon the
          Merger and the Merger Agreement or at any adjournment thereof or in
          any other circumstances upon which a vote, consent or other approval
          (including by written consent) with respect to the Merger and the
          Merger Agreement is sought from the stockholders of the Company, the
          Stockholder shall vote (or cause to be voted) Stockholder's Securities
          in favor of approving the Merger, the adoption of the


<PAGE>
 
          Merger Agreement and the approval of the other transactions
          contemplated by the Merger Agreement and the calling of a special
          meeting of the stockholders of the Company to consider any of the
          foregoing.  At any meeting of stockholders of the Company or at any
          adjournment thereof or in any other circumstances upon which the
          Stockholder's vote, consent or other approval is sought, Stockholder
          shall vote (or cause to be voted) Stockholder's Securities against (i)
          any Alternative Proposal, or (ii) any amendment of the Company's
          Certificate of Incorporation or by-laws or other proposal or
          transaction involving the Company or any of its subsidiaries or any
          motion at a meeting of stockholders of the Company, which amendment or
          other proposal or transaction or motion would in any manner impede,
          frustrate, prevent or nullify, the Merger, the Merger Agreement or any
          of the other transactions contemplated by the Merger Agreement
          (collectively, "Frustrating Transactions").

2.   Grant of Irrevocable Proxy Coupled with an Interest; Appointment of Proxy.

     (a)  Stockholder hereby irrevocably grants to, and appoints, any individual
          who shall be designated by Parent, and each of them, Stockholder's
          proxy and attorney-in-fact (with full power of substitution), for and
          in the name, place and stead of such Stockholder, to vote
          Stockholder's Securities, or grant a consent or approval in respect of
          such Securities, at any meeting of stockholders of the Company or at
          any adjournment thereof or in any other circumstances upon which their
          vote, consent or other approval is sought, (i) in favor of the Merger,
          the adoption by the Company of the Merger Agreement and the approval
          of the other transactions contemplated by the Merger Agreement and the
          calling of a special meeting of the stockholders of the Company to
          consider any of the foregoing, and (ii) against any Alternative
          Proposal or Frustrating Transaction.

     (b)  Stockholder represents that any proxies heretofore given in respect of
          Stockholder's Securities are not irrevocable, and that any such
          proxies are hereby revoked.

     (c)  STOCKHOLDER HEREBY AFFIRMS THAT THE PROXY SET FORTH IN THIS SECTION 2
          IS COUPLED WITH AN INTEREST AND IS IRREVOCABLE UNTIL THE TIME SET
          FORTH IN THE LAST SENTENCE OF THIS SECTION.  Stockholder hereby
          further affirms that such irrevocable proxy is given in connection
          with the execution of the Merger Agreement, and that such irrevocable
          proxy is given to secure the performance of the duties of Stockholder
          under this Agreement.  Stockholder hereby ratifies and confirms all
          that the individual voting such irrevocable proxy may lawfully do or
          cause to be done by virtue hereof.  Such irrevocable proxy is executed
          and intended to be irrevocable in accordance with the provisions of
          Section 212 of the Delaware


<PAGE>
 
          General Corporate Law ("DGCL").  Such irrevocable proxy shall be valid
          until the earlier to occur of (i) one year from the date hereof or
          (ii) the termination of this Agreement in accordance with its terms.

3.   Representations and Warranties of the Stockholder.  Stockholder hereby
     represents and warrants to Parent as follows:

     (a)  Authorization.  The Stockholder has the legal capacity to execute,
          deliver and perform this Agreement.  This Agreement constitutes a
          valid and binding obligation of the Stockholder enforceable against
          the Stockholder in accordance with its terms.  If the Stockholder is
          married and the Securities constitute community property under
          applicable law, this Agreement has been duly authorized, executed and
          delivered by, and constitutes the valid and binding agreement of, the
          Stockholder's spouse enforceable against such spouse in accordance
          with its terms.

     (b)  No Conflict.  The execution, delivery and performance by the
          Stockholder of this Agreement and the consummation of the transactions
          contemplated hereby do not and will not (i) result in any breach or
          violation of or be in conflict with or constitute a default under any
          law or agreement or arrangement to which the Stockholder is a party or
          by which the Stockholder is bound, (ii) require any filing by the
          Stockholder with or authorization by any governmental entity (other
          than 13 D/G amendments) or (iii) require any consent or other action
          by any person under, constitute a default under, or give rise to any
          right of termination, cancellation or acceleration of a loss of any
          benefit to  which the Stockholder is entitled under any provision of
          any agreement or other instrument binding on the Stockholder.

     (c)  Ownership of Securities.  Stockholder's Securities and the
          certificates representing such Securities are now held by Stockholder,
          or by a nominee or custodian for the benefit of Stockholder, and the
          Stockholder has good and marketable title to such Securities, free and
          clear of any (i) liens, proxies, voting trusts or agreements,
          understandings or arrangements and (ii) pledges, restrictions, charges
          or other adverse claims of any kind or nature (other than the "zero-
          cost collar" arrangement described in Section 1(a) above).
          Stockholder owns of record or beneficially no securities of the
          Company, or any options, warrants or rights exercisable for securities
          of the Company, other than the Securities set forth opposite the
          Stockholder's name on Schedule A hereto.

     (d)  Merger Agreement.  Stockholder understands and acknowledges that
          Parent and Subsidiary are entering into the Merger Agreement in
          reliance upon the Stockholder's execution and delivery of this
          Agreement.


<PAGE>
 
4.   Further Assurances.  Stockholder will, from time to time, execute and
     deliver, or cause to be executed and delivered, such additional or further
     transfers, assignments, endorsements, consents and other instruments as
     Parent may reasonably request for the purpose of effectively carrying out
     the transactions contemplated by this Agreement and to vest the power to
     vote Stockholder's Securities as contemplated by Section 2.

5.   Assignment; Binding Effect.  Except as set forth herein, neither this
     Agreement nor any of the rights, interests or obligations hereunder shall
     be assigned by any of the parties hereto (whether by operation of law or
     otherwise) without the prior written consent of the other parties.  Subject
     to the preceding sentence, this Agreement shall be binding upon, inure to
     the benefit of, and be enforceable by, the parties hereto and their
     respective successors and assigns.  Notwithstanding anything contained in
     this Agreement to the contrary, nothing in this Agreement, expressed or
     implied, is intended to confer on any person other than the parties hereto
     or their respective heirs, successors, executors, administrators and
     assigns any rights, remedies, obligations or liabilities under or by reason
     of this Agreement.

6.   Termination.  This Agreement, and all rights and obligations of the parties
     hereunder, shall terminate upon the earliest to occur of the Effective Time
     or the  termination of the Merger Agreement in accordance with its terms.
     Nothing in this Section 6 shall relieve any party from liability for
     willful breach of this Agreement.

7.   Stop Transfer.  The Company agrees with, and covenants to, Parent that the
     Company shall not register the transfer of any certificate representing
     Stockholder's Securities unless such transfer is made in accordance with
     the terms of this Agreement.

8.   General Provisions.

     (a)  Expenses.  All costs and expenses incurred by Parent in connection
          with this Agreement and the transactions contemplated hereby shall be
          paid by Parent.  All costs and expenses incurred by the Stockholder in
          connection with this Agreement and the transactions contemplated
          hereby shall be paid by the Company; provided, however, that Parent
          shall reimburse Stockholder, or pay for directly if practicable, any
          expenses incurred in connection with actions requested by Parent.

     (b)  Amendments.  This Agreement may not be amended except by an instrument
          in writing signed by each of the parties hereto.

     (c)  Notice.  All notices and other communications hereunder shall be in
          writing and shall be deemed given upon receipt to the parties at the
          following addresses (or at such other address for a party as shall be
          specified by like notice):


<PAGE>
 
          (i) if to Parent, to:

               Watson Pharmaceuticals, Inc.
               311 Bonnie Circle
               Corona, California 91720
               Fax: (909) 270-1429
               Attn: Chairman & CEO

          with a copy to:

               Watson Pharmaceuticals, Inc.
               311 Bonnie Circle
               Corona, California 91720
               Fax: (909) 270-1429
               Attn: Legal Department

          ; and

          (ii)if to Stockholder, to the address set forth under the name of
          Stockholder on Schedule A attached hereto;

          with a copy to:

               [Kirkland & Ellis
               153 East 53rd Street
               New York, New York 10022
               Fax: (212) 446-4900
               Attn: Stephen P. H. Johnson]

     (d)  Interpretation. When a reference is made in this Agreement to a
          Section, such reference shall be to a Section of this Agreement unless
          otherwise indicated. The headings contained in this Agreement are for
          reference purposes only and shall not affect in any way the meaning or
          interpretation of this Agreement. Wherever the words "include",
          "includes" or "including" are used in this Agreement, they shall be
          deemed to be followed by the words "without limitation".

     (e)  Counterparts. This Agreement may be executed in two or more
          counterparts, all of which shall be considered one and the same
          agreement and shall become effective when two or more counterparts
          have been signed by each of the parties and delivered to the other
          parties, it being understood that all parties need not sign the same
          counterpart.


<PAGE>
 
     (f)  Entire Agreement; No Third-party Beneficiaries. This Agreement
          (including the documents and instruments referred to herein) (i)
          constitutes the entire agreement and supersedes all prior agreements
          and understandings, both written and oral, among the parties with
          respect to the subject matter hereof and (ii) is not intended to
          confer upon any person other than the parties hereto any rights or
          remedies hereunder.

     (g)  Governing Law. This Agreement shall be governed and construed in
          accordance with the laws of the State of Delaware without regard to
          any applicable conflicts of law.

9.   Stockholder Capacity. Stockholder signs solely in his capacity as the
     record holder and beneficial owner of, or the trustee of a trust whose
     beneficiaries are the beneficial owners of, Stockholder's Securities and
     nothing herein shall limit or affect any actions taken by Stockholder in
     his capacity as an officer or director, if applicable, of the Company to
     the extent specifically permitted by the Merger Agreement.

10.  Enforcement. The parties agree that irreparable damage would occur in the
     event that any of the provisions of this Agreement were not performed in
     accordance with their specific terms or were otherwise breached. It is
     accordingly agreed that the parties shall be entitled to an injunction or
     injunctions to prevent breaches of this Agreement and to enforce
     specifically the terms and provisions of this Agreement in a court of the
     United States. This being in addition to any other remedy to which they are
     entitled at law or in equity. In addition, each of the parties hereto
     waives any right to trial by jury with respect to any claim or proceeding
     related to or arising out of this Agreement or any of the transactions
     contemplated hereby.

     STOCKHOLDER AGREES THAT, IN CONNECTION WITH ANY LEGAL SUIT OR PROCEEDING
     ARISING WITH RESPECT TO THIS AGREEMENT, IT SHALL SUBMIT TO THE JURISDICTION
     OF THE UNITED STATES DISTRICT COURT FOR THE DISTRICT OF DELAWARE AND AGREES
     TO VENUE IN SUCH COURTS. STOCKHOLDER HEREBY APPOINTS THE SECRETARY OF THE
     COMPANY AS HIS AGENT FOR SERVICE OF PROCESS FOR PURPOSES OF THE FOREGOING
     SENTENCE ONLY. EACH PARTY HERETO WAIVES ANY RIGHT TO JURY TRIAL IN
     CONNECTION WITH ANY SUCH SUIT OR PROCEEDING.

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

                                    WATSON PHARMACEUTICALS, INC.



                                    By: /s/ Robert C. Funsten
                                        --------------------------------------
                                    Name: Robert C. Funsten
                                          ------------------------------------
                                    Title: Vice President, Legal Affairs
                                           -----------------------------------

                                    STOCKHOLDER


                                    /s/ William I. Higuchi
                                    ------------------------------------------
                                    William I. Higuchi
<PAGE>
 
                                  SCHEDULE A


STOCKHOLDER                                                      SECURITIES HELD

William I. Higuchi                                                  2,299,034


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