ALZA CORP
S-3, 1996-04-08
PHARMACEUTICAL PREPARATIONS
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<PAGE>
     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON APRIL 8, 1996
 
                                                      REGISTRATION NO. 333-
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549
                           --------------------------
 
                                    FORM S-3
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                            ------------------------
 
                                ALZA CORPORATION
             (Exact name of registrant as specified in its charter)
 
<TABLE>
<S>                          <C>
         DELAWARE                 77-0142070
      (State or other          (I.R.S. employer
      jurisdiction of           identification
     incorporation or              number)
       organization)
</TABLE>
 
   950 PAGE MILL ROAD, P.O. BOX 10950, PALO ALTO, CALIFORNIA 94303-0802 (415)
                                    494-5000
  (Address, including zip code, and telephone number, including area code, of
                   registrant's principal executive offices)
 
                                BRUCE C. COZADD
                   VICE PRESIDENT AND CHIEF FINANCIAL OFFICER
                                ALZA CORPORATION
                       950 PAGE MILL ROAD, P.O. BOX 10950
                        PALO ALTO, CALIFORNIA 94303-0802
                                 (415) 494-5000
 (Name, address, including zip code, and telephone number, including area code,
                             of agent for service)
                           --------------------------
 
           WITH COPIES OF ALL ORDERS, NOTICES AND COMMUNICATIONS TO:
 
<TABLE>
<S>                                      <C>
            Sarah A. O'Dowd                       Thomas C. Janson, Jr.
    Heller Ehrman White & McAuliffe       Skadden, Arps, Slate, Meagher & Flom
         525 University Avenue                   300 South Grand Avenue
      Palo Alto, California 94301                      Suite 3400
            (415) 324-7000                    Los Angeles, California 90071
                                                     (213) 687-5000
</TABLE>
 
                           --------------------------
 
        APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:
As soon as practicable after the effective date of this Registration Statement.
                           --------------------------
 
    If  the  only securities  being registered  on this  Form are  being offered
pursuant to dividend or  interest investment plans,  please check the  following
box. / /
 
    If  any of the securities being registered on this Form are being offered on
a delayed or continuous basis pursuant to  Rule 415 under the Securities Act  of
1933, as amended, other than securities offered only in connection with dividend
or interest reinvestment plans, check the following box. / /
 
    If  this Form  is filed  to register  additional securities  for an offering
pursuant to Rule 462(b) under the Securities Act of 1933, as amended, check  the
following  box and  list the Securities  Act Registration number  of the earlier
effective registration statement for the same offering. / /
                           --------------------------
 
    If this Form  is a post-effective  amendment filed pursuant  to Rule  462(c)
under  the Securities Act of  1933 as amended, check  the following box and list
the Securities  Act of  1933, as  amended, registration  number of  the  earlier
effective registration statement for the same offering. / /
                           --------------------------
 
                        CALCULATION OF REGISTRATION FEE
 
<TABLE>
<CAPTION>
                                                           PROPOSED          PROPOSED
                                                           MAXIMUM           MAXIMUM
                                          AMOUNT        OFFERING PRICE      AGGREGATE
      TITLE OF EACH CLASS OF              TO BE         PER DEBENTURE     OFFERING PRICE      AMOUNT OF
    SECURITIES TO BE REGISTERED         REGISTERED           (1)               (1)         REGISTRATION FEE
<S>                                  <C>               <C>               <C>               <C>
Debentures due 2006................  $460,000,000(2)         100%          $460,000,000        $158,621
Common Stock, par value
 $.01 per share....................        (3)                --                --               None
</TABLE>
 
(1)  Estimated  solely  for  the purpose  of  calculating  the  registration fee
    pursuant to Rule 457 under the Securities Act of 1933, as amended.
(2) Includes $60,000,000 aggregate principal amount of Debentures subject to the
    Underwriter's over-allotment option.
(3) Also being  registered are  such indeterminate  number of  shares of  Common
    Stock  as  may  be issuable  upon  conversion of  the  Debentures registered
    hereby.
 
    THE REGISTRANT HEREBY  AMENDS THIS  REGISTRATION STATEMENT ON  SUCH DATE  OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE  A  FURTHER  AMENDMENT  WHICH SPECIFICALLY  STATES  THAT  THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE  IN ACCORDANCE WITH SECTION 8(A)  OF
THE  SECURITIES ACT  OF 1933 OR  UNTIL THIS REGISTRATION  STATEMENT SHALL BECOME
EFFECTIVE ON  SUCH  DATE  AS  THE SECURITIES  AND  EXCHANGE  COMMISSION,  ACTING
PURSUANT TO SAID SECTION 8(A), MAY DETERMINE.
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
INFORMATION   CONTAINED  HEREIN  IS  SUBJECT   TO  COMPLETION  OR  AMENDMENT.  A
REGISTRATION STATEMENT  RELATING TO  THESE SECURITIES  HAS BEEN  FILED WITH  THE
SECURITIES  AND EXCHANGE  COMMISSION. THESE SECURITIES  MAY NOT BE  SOLD NOR MAY
OFFERS TO BUY BE ACCEPTED PRIOR  TO THE TIME THE REGISTRATION STATEMENT  BECOMES
EFFECTIVE.  THIS  PROSPECTUS  SHALL  NOT  CONSTITUTE AN  OFFER  TO  SELL  OR THE
SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE  SECURITIES
IN  ANY STATE IN WHICH SUCH OFFER,  SOLICITATION OR SALE WOULD BE UNLAWFUL PRIOR
TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF ANY SUCH STATE.
<PAGE>
                             SUBJECT TO COMPLETION
                  PRELIMINARY PROSPECTUS DATED APRIL   , 1996
P R O S P E C T U S
                                  $400,000,000
 
                                     [LOGO]
                  % CONVERTIBLE SUBORDINATED DEBENTURES DUE 2006
                               ------------------
 
    The   % Convertible Subordinated  Debentures due 2006 (the "Debentures")  to
be  issued  by  ALZA  Corporation,  a  Delaware  corporation  ("ALZA"),  will be
convertible, at the option of the holder,  at any time on or prior to  maturity,
unless  previously redeemed or repurchased, into shares of Common Stock of ALZA,
$.01 par value per share ("Common Stock"), at a  conversion price of $       per
share  of Common  Stock (equivalent to  a conversion rate  of         shares per
$1,000  principal  amount  of  Debentures),  subject  to  certain  anti-dilution
adjustments.  See "Description  of Debentures  -- Conversion  of Debentures." On
April 4, 1996, the last reported sale  price of the Common Stock as reported  on
the New York Stock Exchange was $32 3/8 per share. The Common Stock is listed on
the New York Stock Exchange under the symbol "AZA".
 
    Interest on the Debentures will be payable on             and             of
each  year, commencing              , 1996. The Debentures will be redeemable by
ALZA, in whole or in part, at any time  on or after              , 1999, at  the
redemption  prices  set  forth herein,  in  each  case plus  accrued  and unpaid
interest, if any, to the  redemption date. In the event  of a Change in  Control
(as  defined  herein), each  holder of  the  Debentures will  have the  right to
require ALZA to repurchase all or a portion of such holder's Debentures at  100%
of  the principal amount thereof,  plus accrued and unpaid  interest, if any, to
the date of repurchase. See "Description of Debentures."
 
    The Debentures are  unsecured and subordinated  in right of  payment to  all
existing  and  future Senior  Indebtedness (as  defined herein)  of ALZA.  As of
December 31, 1995, ALZA had $850,000 of debt that would have constituted  Senior
Indebtedness. The Debentures will rank pari passu with ALZA's outstanding 5 1/4%
Liquid  Yield Option-TM- Notes due 2014  (the "LYONs"-TM-), which as of December
31, 1995 had an accreted value  of $362,944,000. See "Description of  Debentures
- -- Subordination of Debentures."
 
    Application  has been  made to  list the  Debentures on  the New  York Stock
Exchange under the symbol       .
 
    SEE "RISK FACTORS" BEGINNING ON PAGE  7 FOR A DISCUSSION OF CERTAIN  FACTORS
WHICH SHOULD BE CAREFULLY CONSIDERED BY PROSPECTIVE PURCHASERS OF THE DEBENTURES
OFFERED HEREBY.
                             ---------------------
THESE  SECURITIES HAVE NOT  BEEN APPROVED OR DISAPPROVED  BY THE SECURITIES AND
 EXCHANGE  COMMISSION  OR  ANY  STATE  SECURITIES  COMMISSION,  NOR  HAS  THE
   SECURITIES  AND EXCHANGE  COMMISSION OR  ANY STATE  SECURITIES COMMISSION
    PASSED  UPON  THE  ACCURACY  OR   ADEQUACY  OF  THIS  PROSPECTUS.   ANY
                 REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
 
<TABLE>
<CAPTION>
                                                          PRICE TO          UNDERWRITING        PROCEEDS TO
                                                         PUBLIC(1)          DISCOUNT(2)           ALZA(3)
<S>                                                  <C>                 <C>                 <C>
Per Debenture......................................         100%                 %                   %
Total (4)..........................................     $400,000,000             $                   $
</TABLE>
 
(1) Plus accrued interest, if any, from             , 1996.
(2)  ALZA  has  agreed to  indemnify  the  Underwriter against,  and  to provide
    contribution with  respect to,  certain liabilities,  including  liabilities
    under the Securities Act of 1933, as amended. See "Underwriting."
(3) Before deducting expenses payable by ALZA estimated at $500,000.
(4) ALZA has granted the Underwriter an option, exercisable within 30 days after
    the  date of  this Prospectus, to  purchase up to  an additional $60,000,000
    aggregate principal amount  of Debentures  on the  same terms  as set  forth
    above  to cover over-allotments, if any. If the option is exercised in full,
    the Price to  Public, Underwriting  Discount and  Proceeds to  ALZA will  be
    $460,000,000, $      and $      , respectively. See "Underwriting."
                           --------------------------
 
    The  Debentures are offered by the Underwriter, subject to prior sale, when,
as and if  issued to and  accepted by  the Underwriter, subject  to approval  of
certain  legal  matters  by  counsel  for  the  Underwriter  and  certain  other
conditions. The Underwriter reserves the right to withdraw, cancel or modify any
such offer  and to  reject orders  in  whole or  in part.  It is  expected  that
delivery  of the  Debentures will  be made in  New York,  New York,  on or about
            , 1996.
 
- -TM-Trademark of Merrill Lynch & Co., Inc.
 
                           --------------------------
                              MERRILL LYNCH & CO.
                                ---------------
 
               The date of this Prospectus is             , 1996
<PAGE>
    IN CONNECTION WITH THIS OFFERING,  THE UNDERWRITER MAY OVER-ALLOT OR  EFFECT
TRANSACTIONS  WHICH STABILIZE  OR MAINTAIN  THE MARKET  PRICE OF  THE DEBENTURES
OFFERED HEREBY, THE COMMON STOCK OF ALZA OR OTHER SECURITIES OF ALZA, OR ANY  OF
THEM,  AT LEVELS ABOVE THOSE  WHICH MIGHT OTHERWISE PREVAIL  IN THE OPEN MARKET.
SUCH TRANSACTIONS  MAY  BE EFFECTED  ON  THE NEW  YORK  STOCK EXCHANGE,  IN  THE
OVER-THE-COUNTER  MARKET OR  OTHERWISE. SUCH  STABILIZING, IF  COMMENCED, MAY BE
DISCONTINUED AT ANY TIME.
 
                            ------------------------
 
                             AVAILABLE INFORMATION
 
    ALZA is subject to the informational requirements of the Securities Exchange
Act of 1934, as amended (the "Exchange Act"), and in accordance therewith  files
reports, proxy statements and other information with the Securities and Exchange
Commission   (the  "Commission").  Such  reports,  proxy  statements  and  other
information  may  be  inspected  at  the  public  reference  facilities  of  the
Commission  at Judiciary  Plaza, 450 Fifth  Street, N.W.,  Washington, DC 20549.
Copies of such material can be obtained at prescribed rates from the  Commission
at  such address. Such reports, proxy  statements and other information can also
be inspected at the Commission's regional offices at 7 World Trade Center,  13th
Floor,  New York,  New York 10019  and at  500 West Madison  Street, Suite 1400,
Chicago, Illinois 60661. In addition,  such reports, proxy statements and  other
information  concerning ALZA  may be  inspected at the  offices of  the New York
Stock Exchange at 20 Broad Street, New York, New York 10005.
 
    ALZA has filed  with the  Commission a  Registration Statement  on Form  S-3
under  the  Securities Act  of  1933, as  amended  (the "Securities  Act"), with
respect to the securities offered by this Prospectus. As permitted by the  rules
and  regulations of the Commission, this Prospectus  does not contain all of the
information set  forth  in  the  Registration Statement  and  the  exhibits  and
schedules  thereto.  For  further  information  with  respect  to  ALZA  and the
securities offered hereby, reference is  made to the Registration Statement  and
the  exhibits  thereto,  which may  be  examined  without charge  at  the public
reference facilities maintained by the Commission at Judiciary Plaza, 450  Fifth
Street, N.W., Washington, DC 20549, and copies of which may be obtained from the
Commission upon payment of the prescribed fees.
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
    The  following documents, which have been filed by ALZA with the Commission,
are hereby incorporated by reference in this Prospectus:
 
        (a) ALZA's Annual Report on Form 10-K for the fiscal year ended December
    31, 1995; and
 
        (b) The description of the Common Stock contained in ALZA's registration
    statement on Form 8-A filed May  14, 1992 under the Exchange Act,  including
    any amendment or reports filed for the purpose of updating such description.
 
    All documents filed by ALZA pursuant to Section 13(a), 13(c), 14 or 15(d) of
the  Exchange Act  subsequent to the  date of  this Prospectus and  prior to the
termination of the offering of the securities offered hereby shall be deemed  to
be  incorporated by reference into this Prospectus  and to be a part hereof from
the respective dates of filing of  such documents. Any statement contained in  a
document  incorporated or deemed to be incorporated by reference herein shall be
deemed to  be modified  or superseded  for purposes  of this  Prospectus to  the
extent  that a  statement contained herein,  or in any  other subsequently filed
document that  also is  or is  deemed to  be incorporated  by reference  herein,
modifies  or  supersedes  such  statement. Any  such  statement  so  modified or
superseded shall  not  be  deemed,  except as  so  modified  or  superseded,  to
constitute a part of this Prospectus.
 
    Upon  written or oral request directed  to Corporate and Investor Relations,
ALZA Corporation, 950  Page Mill  Road, P.O.  Box 10950,  Palo Alto,  California
94303-0802,  telephone (415) 494-5222, ALZA will provide, without charge, to any
person to whom this Prospectus is delivered, a copy of any document incorporated
by reference in  this Prospectus (not  including exhibits to  any such  document
except  to  the  extent  any  such  exhibits  are  specifically  incorporated by
reference in the information incorporated in this Prospectus).
 
                                       2
<PAGE>
                               PROSPECTUS SUMMARY
 
    STATEMENTS   MADE  IN  THIS  PROSPECTUS  RELATING  TO  PRODUCT  DEVELOPMENT,
MANUFACTURING AND MARKETING,  OR THAT  OTHERWISE RELATE TO  FUTURE PERIODS,  ARE
FORWARD-LOOKING  STATEMENTS WITHIN THE MEANING OF  SECTION 27A OF THE SECURITIES
ACT AND SECTION 21E OF THE EXCHANGE ACT. ACTUAL RESULTS COULD DIFFER  MATERIALLY
FROM  THOSE ANTICIPATED IN THE FORWARD-LOOKING STATEMENTS AS A RESULT OF CERTAIN
RISKS DESCRIBED IN THIS PROSPECTUS (INCLUDING ALZA'S ANNUAL REPORT ON FORM  10-K
FOR 1995 AND OTHER DOCUMENTS INCORPORATED HEREIN BY REFERENCE).
 
                                      ALZA
 
    ALZA  is a  leader in  the development  and commercialization  of innovative
pharmaceutical products  that  incorporate  drugs  into  advanced  dosage  forms
designed to provide controlled, predetermined rates of drug release for extended
time  periods.  By administering  drugs in  preset  patterns and  by alternative
routes, ALZA's  advanced  dosage  forms, called  therapeutic  systems,  can  add
medical  and economic value to drug  therapies by minimizing their unpleasant or
harmful side  effects, optimizing  their  beneficial actions,  simplifying  drug
therapy,  and  increasing patient  compliance by  decreasing the  frequency with
which medication must be administered.
 
    Historically, most  of  ALZA's  product  development  activities  have  been
undertaken  pursuant to joint development  and commercialization agreements with
pharmaceutical  companies.   These   agreements   normally   provide   for   the
pharmaceutical  company client to  reimburse ALZA for  costs incurred in product
development and clinical evaluation of a specified product, including a  portion
of  general and administrative expenses. The client receives marketing rights to
the product and ALZA  receives royalties on the  client's sales of the  product.
Generally ALZA manufactures all or a portion of the client's requirements of the
product.  Among  the ALZA-developed  products commercialized  to date  by client
companies are Procardia XL-Registered  Trademark- (nifedipine) extended  release
tablets  for  the  treatment of  angina  and  hypertension, Duragesic-Registered
Trademark- (fentanyl) CII  for the management  of chronic pain  in patients  who
require  continuous opioid analgesia  for pain that cannot  be managed by lesser
means,  Transderm-Nitro-Registered  Trademark-  (nitroglycerin),  a   once-daily
product  for the prevention  of angina pectoris due  to coronary artery disease,
and Nicoderm-Registered Trademark- (nicotine), an  aid in smoking cessation  for
relief of nicotine withdrawal symptoms.
 
    The  United States health care industry has changed dramatically in the last
several years.  Pharmaceutical companies  have  reduced sales  forces,  acquired
pharmacy  benefit  companies, and  built alliances  in an  effort to  cut costs,
secure market share, and improve research and development productivity. In  this
environment,  every new pharmaceutical product must add value to the health care
marketplace. These changes have created a unique opportunity for ALZA.
 
    Beginning in the early 1990s and  accelerating over the past several  years,
ALZA  has embarked on  a three-part strategy to  capitalize on the opportunities
created by  the new  health  care marketplace.  First,  ALZA has  continued  its
traditional product development arrangements with client companies.
 
    Second,  ALZA has expanded its commercialization capabilities and activities
through  its  ALZA  Pharmaceuticals  division.  In  1994,  ALZA  Pharmaceuticals
introduced  in  the United  States  Testoderm-Registered Trademark-(testosterone
transdermal system) CIII for hormone replacement therapy in males for conditions
associated with a deficiency or absence of endogenous testosterone. Also  during
1994,  ALZA's sales force began to co-promote  in the United States two products
developed by ALZA under agreements with client companies -- Duragesic-Registered
Trademark-  with  Janssen   Pharmaceutica,  Inc.   ("Janssen"),  and   Glucotrol
XL-Registered  Trademark-  with  Pfizer  Inc. ("Pfizer").  In  April  1996, ALZA
Pharmaceuticals launched  in  the  United  States  Ethyol-Registered  Trademark-
(amifostine),  a unique agent developed by  U.S. Bioscience, Inc., indicated for
the  reduction   of  cumulative   renal   toxicity  associated   with   repeated
administration  of the chemotherapeutic drug cisplatin in patients with advanced
ovarian cancer  or non-small  cell lung  cancer. ALZA  has exclusive  rights  to
market  the product for five years, with  an option to extend for one additional
year; U.S. Bioscience co-promotes the product with ALZA. As part of its strategy
to expand  its commercialization  activities, and  in order  to decrease  ALZA's
dependence  on client  companies, ALZA formed  Therapeutic Discovery Corporation
("TDC")  in  1993   to  develop,  with   ALZA,  a  pipeline   of  products   for
commercialization  by ALZA. At  the end of 1995,  ALZA and TDC  had more than 20
products in  various stages  of development,  including a  number in  Phase  III
clinical evaluation.
 
                                       3
<PAGE>
    Third,  in order  to extend ALZA's  leadership in  drug delivery technology,
ALZA formed the  ALZA Technology Institute  ("ATI") in 1994.  ATI is  increasing
ALZA's  investment  in  the  research and  development  of  therapeutic systems,
including systems for  the delivery of  biotechnology compounds and  for use  in
gene therapy.
 
    ALZA's  principal executive offices are located  at 950 Page Mill Road, P.O.
Box 10950, Palo Alto,  California 94303-0802 and its  telephone number is  (415)
494-5000.
 
                                  THE OFFERING
 
<TABLE>
<S>                                      <C>
The Debentures.........................  $400,000,000 aggregate principal amount
                                         ($460,000,000  aggregate  principal  amount  if the
                                         Underwriter's over- allotment  option is  exercised
                                         in  full)  of          %  Convertible  Subordinated
                                         Debentures due 2006.
 
Payment of Interest....................  The Debentures will  bear interest at  the rate  of
                                             %   per   annum.  Interest   will   be  payable
                                         semi-annually on            and            of  each
                                         year,  commencing                      ,  1996. See
                                         "Description of Debentures -- General."
 
Conversion Rights......................  The Debentures are  convertible, at  the option  of
                                         the  holder, at any  time on or  prior to maturity,
                                         unless previously  redeemed  or  repurchased,  into
                                         shares  of Common  Stock, at a  conversion price of
                                         $      per share, subject to certain  anti-dilution
                                         adjustments.  See  "Description  of  Debentures  --
                                         Conversion of Debentures."
 
Optional Redemption by ALZA............  The Debentures  are  redeemable at  the  option  of
                                         ALZA,  in whole or in part, at any time on or after
                                               , 1999, at  the redemption  prices set  forth
                                         herein,  in  each  case  plus  accrued  and  unpaid
                                         interest, if  any,  to  the  redemption  date.  See
                                         "Description  of Debentures  -- Optional Redemption
                                         by ALZA."
 
Repurchase at Option of Holders Upon
 Change in Control.....................  In the  event  a  Change in  Control  occurs,  each
                                         holder of Debentures may require ALZA to repurchase
                                         all  or a  portion of  such holder's  Debentures at
                                         100% of the principal amount thereof, together with
                                         accrued interest  to  the  repurchase  date.  If  a
                                         Change  in Control were  to occur, there  can be no
                                         assurance that ALZA would have sufficient funds  to
                                         pay   the  repurchase  price   for  all  Debentures
                                         tendered by the  holders thereof. See  "Description
                                         of  Debentures --  Repurchase at  Option of Holders
                                         Upon Change in Control."
</TABLE>
 
                                       4
<PAGE>
 
<TABLE>
<S>                                      <C>
Subordination..........................  The Debentures will be subordinated to all existing
                                         and  future  Senior   Indebtedness  of  ALZA,   the
                                         principal  amount of which as  of December 31, 1995
                                         was $850,000. The Debentures  will rank pari  passu
                                         with   ALZA's  outstanding  LYONs,   which  had  an
                                         accreted value of $362,944,000 at December 31, 1995
                                         ($948,750,000  principal  amount  at  maturity   in
                                         2014).   The  Debentures  will   not  restrict  the
                                         incurrence of Senior Indebtedness  by ALZA, or  the
                                         incurrence  of other indebtedness or liabilities by
                                         ALZA  or  its   subsidiaries  or  affiliates.   See
                                         "Capitalization"  and "Description of Debentures --
                                         Subordination of Debentures."
 
Use of Proceeds........................  ALZA will use the net proceeds of the offering  for
                                         general corporate purposes. See "Use of Proceeds."
 
Listing................................  Application has been made to list the Debentures on
                                         the  New  York  Stock  Exchange  under  the  symbol
                                                 . The Common Stock  is currently traded  on
                                         the New York Stock Exchange under the symbol "AZA".
</TABLE>
 
                                       5
<PAGE>
                      SUMMARY CONSOLIDATED FINANCIAL DATA
 
    Set  forth below  are summary  consolidated financial  data for  ALZA at the
dates and for the periods indicated.
 
<TABLE>
<CAPTION>
                                                                            YEARS ENDED DECEMBER 31,
                                                      --------------------------------------------------------------------
                                                          1995          1994          1993          1992          1991
                                                      ------------  ------------  ------------  ------------  ------------
<S>                                                   <C>           <C>           <C>           <C>           <C>
                                                                (IN THOUSANDS, EXCEPT PER SHARE DATA AND RATIOS)
STATEMENT OF OPERATIONS DATA:
  Total revenues....................................  $  350,624    $  278,756    $  234,182    $  250,519    $  162,349
  Net income (loss).................................      72,408(1)     58,120        45,612(2)     72,170       (62,076)(3)
  Net income (loss) per share.......................        0.88          0.71          0.57          0.90         (0.88  )
BALANCE SHEET DATA:
  Working capital (deficiency)......................  $  510,120    $  436,445    $  (87,767   (2) $  188,744 $  227,950
  Total assets......................................     937,215       806,252       621,824       698,381       580,490
  5 1/4% zero coupon convertible subordinated
   debentures (LYONs)...............................     362,944       344,593            --            --            --
  Commercial paper..................................          --            --       249,520  (2)         --          --
  7 1/2% zero coupon convertible subordinated
   debentures.......................................          --            --            --       228,966       213,220
  Other long-term liabilities.......................      51,770        41,192        28,969        22,723        23,607
  Total stockholders' equity........................     454,553       364,479       306,677  (4)    407,543     322,854
OTHER DATA:
  Ratio of earnings to fixed charges (5)............        5.5x          5.5x          3.9x          6.3x            --  (6)
</TABLE>
 
- --------------------------
 
 (1) Includes a pre-tax  benefit of $7  million from the  reversal of a  reserve
     established  after  a  patent  infringement suit  was  filed  by Ciba-Geigy
     Corporation against ALZA and Marion  Merrell Dow, Inc. (now Hoechst  Marion
     Roussel,  Inc.) and  a pre-tax charge  of $7  million for a  portion of the
     payment  ALZA  made  to  U.S.  Bioscience,  Inc.  under  a  marketing   and
     distribution agreement for Ethyol-Registered Trademark-.
 
 (2) Includes  pre-tax charges and allowances of $28 million ($0.23 per share on
     an after-tax  basis) related  primarily to  manufacturing activities.  Also
     includes  $7 million ($0.08 per share)  in one-time benefits resulting from
     the adoption  of  Statement  of Financial  Accounting  Standards  No.  109,
     ACCOUNTING   FOR  INCOME  TAXES,  and  a   $4  million  ($0.05  per  share)
     extraordinary refinancing  charge  relating  to the  redemption  of  ALZA's
     7  1/2% zero  coupon convertible subordinated  debentures. The  7 1/2% zero
     coupon convertible subordinated  debentures were  replaced with  commercial
     paper  which was  classified as  short-term debt,  thereby reducing working
     capital.
 
 (3) In 1991 ALZA incurred a one-time pre-tax charge of $101 million ($1.38  per
     share  on  an  after-tax  basis) relating  to  the  purchase  of in-process
     technology in connection with the acquisition of Bio-Electro Systems, Inc.,
     a company acquired by ALZA in early 1992.
 
 (4) Total stockholders' equity decreased from December 31, 1992 to December 31,
     1993 primarily due to the special dividend paid in 1993 to stockholders  in
     connection with the formation of TDC, which reduced stockholders' equity by
     $250 million.
 
 (5) The ratios of earnings to fixed charges were calculated by dividing the sum
     of  (i) income (loss) before income taxes and the extraordinary refinancing
     charge and  cumulative effect  of the  accounting change  described in  (2)
     above  and (ii) fixed  charges (reduced by  capitalized interest costs), by
     fixed  charges.   Fixed  charges   consist   of  interest   (expensed   and
     capitalized), amortization of debt issue expense and the estimated interest
     portion of rent expense.
 
 (6) Earnings  for the year  ended December 31, 1991  were insufficient to cover
     fixed charges by $43 million. See (3) above.
 
                                       6
<PAGE>
                                  RISK FACTORS
 
    Statements   made  in  this  Prospectus  relating  to  product  development,
manufacturing and marketing,  or that  otherwise relate to  future periods,  are
forward-looking  statements within the meaning of  Section 27A of the Securities
Act and Section 21E of the Exchange Act. Actual results could differ  materially
from  those anticipated in the forward-looking statements as a result of certain
risks described below or elsewhere  in this Prospectus (including ALZA's  Annual
Report  on  Form  10-K  for  1995 and  other  documents  incorporated  herein by
reference).
 
    DEPENDENCE ON  RELATIONSHIPS  WITH  CLIENT COMPANIES.    ALZA's  net  income
currently  results primarily from  royalties and fees  paid by client companies.
Royalties  and  fees  are  derived  from  sales  by  the  clients  of   products
incorporating ALZA technologies, and therefore vary from quarter to quarter as a
result  of changing levels of product  sales by client companies. Because ALZA's
clients make all marketing and other commercialization decisions with respect to
such products (including,  in many  cases, taking  responsibility for  obtaining
necessary  regulatory  approvals),  most  of the  variables  that  affect ALZA's
royalties and fees are not directly  within ALZA's control. In addition,  ALZA's
royalties  and  fees  could be  adversely  affected  if the  pressures  for cost
containment in  the U.S.  health care  system were  to result  in lower  selling
prices  for  royalty-bearing products.  For the  year  ended December  31, 1995,
Procardia XL-Registered Trademark-, marketed by Pfizer, accounted for more  than
40% of ALZA's royalties and fees.
 
    UNCERTAINTIES  RELATING  TO RECENT  AND PLANNED  EXPANSION OF  MARKETING AND
MANUFACTURING ACTIVITIES.  ALZA  has  recently  expanded  its  commercialization
activities.  ALZA began marketing the Testoderm-Registered Trademark-transdermal
therapeutic system in 1994, and is co-promoting Duragesic-Registered  Trademark-
with  Janssen and Glucotrol  XL-Registered Trademark-with Pfizer.  ALZA has also
recently launched  Ethyol-Registered Trademark-  (amifostine). ALZA  intends  to
expand  its commercialization  activities as a  result of  its arrangements with
TDC, and under additional arrangements  with third parties (which could  include
the   acquisition  or  license  of  products  and/or  technologies).  While  the
activities with TDC and other third parties are intended to result in a valuable
pipeline of products for marketing by ALZA, there can be no assurance that  this
will  be  the  case,  nor  can there  be  any  assurance  generally  that ALZA's
commercialization activities will be successful.  ALZA also has expanded and  is
continuing  to  expand its  manufacturing facilities  in anticipation  of future
manufacturing needs. Utilization of these  facilities in any quarter depends  on
many  factors, including client orders,  product approvals, and product launches
and sales,  many  of which  are  outside of  ALZA's  control. There  can  be  no
assurance that ALZA's expanded manufacturing activities will be profitable.
 
    VOLATILITY OF SECURITIES PRICES.  The market prices of ALZA's securities are
subject  to  significant fluctuations  in  response to  variations  in quarterly
operating results,  announcements of  new  commercial products  by ALZA  or  its
competitors,  developments or disputes concerning  patent or proprietary rights,
regulatory developments in both the United States and foreign countries,  health
care  reform  and  regulation,  and  economic  and  other  external  factors. In
addition, the pharmaceutical  sector of  the stock  market has  in recent  years
experienced  significant  price  fluctuations.  Such  fluctuations,  as  well as
economic conditions generally, may adversely  affect the market price of  ALZA's
securities, including its Common Stock and the Debentures.
 
    UNCERTAINTIES CONCERNING EFFECTS OF CHANGES IN U.S. HEALTH CARE MARKET.  The
U.S.  health  care  industry has  continued  to  change rapidly  as  the public,
government, medical practitioners and the pharmaceutical industry focus on  ways
to  expand medical coverage  while controlling the growth  in health care costs.
Legislative changes continue to  be proposed, many of  which, if enacted,  could
put  significant pressures  on the  prices charged  for pharmaceutical products.
Similarly, prescription drug  reimbursement practices  and the  growth of  large
managed  care  organizations, as  well as  generic and  therapeutic substitution
(substitution  of  a   different  product  for   the  same  indication),   could
significantly affect ALZA's business.
 
    ARRANGEMENTS  POTENTIALLY EFFECTING  A CHANGE IN  CONTROL OF  ALZA.  Certain
provisions of ALZA's Certificate of Incorporation, the LYONs and the  Debentures
may  effect a change in control of ALZA. The provisions of ALZA's Certificate of
Incorporation granting the Board of Directors  the authority to issue shares  of
Preferred  Stock with such terms as  the Board may determine, classifying ALZA's
board,  preventing  stockholders  from   calling  special  meetings  of   ALZA's
stockholders and requiring supermajority votes in the
 
                                       7
<PAGE>
event  of  certain  proposed business  combinations  may inhibit  any  change in
control of ALZA. Provisions  in the Debentures and  the outstanding LYONs  grant
the  holders of these securities the right  to require ALZA to repurchase all or
any part of the Debentures  and the LYONs in the  event of a change in  control,
which  may  also effect  any  change in  control  of ALZA.  See  "Description of
Debentures --  Repurchase at  Option  of Holders  Upon  Change in  Control"  and
"Description of Capital Stock."
 
    SUBORDINATION.   The Debentures will be  unsecured and subordinated in right
of payment in full to all existing and future Senior Indebtedness of ALZA. As  a
result  of such  subordination, in the  event of any  insolvency, liquidation or
reorganization of ALZA or upon acceleration of the Debentures due to an Event of
Default, the  assets  of  ALZA will  be  available  to pay  obligations  on  the
Debentures and any other subordinated indebtedness of ALZA only after all Senior
Indebtedness  has been  paid in  full, and  there may  not be  sufficient assets
remaining to pay  amounts due  on any  or all of  the Debentures  and any  other
subordinated  indebtedness  of ALZA  then  outstanding. The  Indenture  does not
prohibit or limit  the incurrence of  Senior Indebtedness or  the incurrence  of
other  indebtedness and other  liabilities by ALZA or  its subsidiaries, and the
incurrence of  additional indebtedness  and  other liabilities  by ALZA  or  its
subsidiaries could adversely affect ALZA's ability to pay its obligations on the
Debentures.  ALZA anticipates  that from time  to time it  will incur additional
indebtedness, including Senior Indebtedness.  See "Description of Debentures  --
Subordination of Debentures."
 
    ABSENCE  OF ESTABLISHED MARKET FOR DEBENTURES.  Prior to the offering of the
Debentures, there has been  no public market for  the Debentures. Although  ALZA
has  applied to have the  Debentures approved for listing  on the New York Stock
Exchange, there can be  no assurance that an  active public market will  develop
for the Debentures or that, if such market develops, the market price will equal
or  exceed  the  public offering  price  set forth  on  the cover  page  of this
Prospectus. The  initial  public  offering  price  of  the  Debentures  will  be
determined  by  negotiation between  ALZA  and the  Underwriter  and may  not be
indicative of  the market  price of  the Debentures  after the  offering of  the
Debentures hereby.
 
                                       8
<PAGE>
                                USE OF PROCEEDS
 
    The  aggregate net proceeds to ALZA from  the sale of the Debentures offered
hereby are estimated to  be approximately $           million (or  approximately
$           million if  the Underwriter's over-allotment  option is exercised in
full). ALZA will use the net proceeds for general corporate purposes, which  may
include  expansion of  ALZA's pharmaceutical  business (including  its sales and
marketing activities), expansion of  research and development and  manufacturing
facilities,  expenditures under existing or  future joint ventures, partnerships
or other similar agreements, the  completion or continuation of the  development
of   TDC  products,  the  acquisition  of  assets,  technologies,  products  and
businesses to expand ALZA's operations, and working capital. Pending such  uses,
ALZA will invest the net proceeds of the offering in marketable securities.
 
                PRICE RANGE OF COMMON STOCK AND DIVIDEND POLICY
 
    ALZA's  Common Stock  is traded  on the  New York  Stock Exchange  under the
symbol "AZA". The following table  sets forth the high  and low per share  sales
price  for the Common Stock  as reported on the  composite tape for the quarters
indicated. The last reported  sale price for  the Common Stock  on the New  York
Stock  Exchange on April 4, 1996 was $32 3/8. These prices do not include retail
mark-ups, mark-downs or commissions.
 
<TABLE>
<CAPTION>
                                              HIGH         LOW
                                             -------     -------
<S>                                          <C>         <C>
1994
  First Quarter.........................     $   30 3/4  $   21
  Second Quarter........................         26 5/8      20 1/4
  Third Quarter.........................         24 1/8      20 1/8
  Fourth Quarter........................         20 3/4      17
1995
  First Quarter.........................         24 1/8      18 1/8
  Second Quarter........................         24 5/8      18 3/8
  Third Quarter.........................         27          22 1/8
  Fourth Quarter........................         25 1/8      20 1/4
1996
  First Quarter.........................         34 7/8      24 3/8
  Second Quarter (through April 4)......         32 1/2      30 1/2
</TABLE>
 
    ALZA has  never paid  a  cash dividend  on its  Common  Stock and  does  not
anticipate doing so in the foreseeable future.
 
                                       9
<PAGE>
                                 CAPITALIZATION
 
    The  following table  sets forth the  capitalization and  short-term debt of
ALZA and its consolidated subsidiaries at December 31, 1995, and as adjusted  to
give  effect to the sale of the  Debentures offered by this Prospectus (assuming
no exercise of the Underwriter's over-allotment option).
 
<TABLE>
<CAPTION>
                                                        DECEMBER 31, 1995
                                                    --------------------------
(IN THOUSANDS, EXCEPT SHARE AND PER SHARE AMOUNTS)    ACTUAL
                                                    ----------
                                                                AS ADJUSTED(1)
                                                                --------------
                                                                 (UNAUDITED)
 
Short-term debt (2)...............................    $    869      $      869
<S>                                                 <C>         <C>
                                                    ----------  --------------
                                                    ----------  --------------
Long-term liabilities:
  5 1/4% zero coupon convertible subordinated
   debentures (LYONs).............................    $362,944      $  362,944
     % convertible subordinated debentures offered
   hereby.........................................          --         400,000
  Other long-term liabilities.....................      51,770          51,770
                                                    ----------  --------------
      Total long-term liabilities.................     414,714         814,714
                                                    ----------  --------------
Stockholders' equity:
  Common Stock, $.01 par value, 300,000,000 shares
   authorized; 82,506,419 shares issued and
   outstanding (3)................................         825             825
  Additional paid-in capital......................     310,451         310,451
  Unrealized gains on available-for-sale
   securities (net of $1,313 tax effect)..........       1,886           1,886
  Retained earnings...............................     141,391         141,391
                                                    ----------  --------------
    Total stockholders' equity....................     454,553         454,553
                                                    ----------  --------------
      Total capitalization........................    $869,267      $1,269,267
                                                    ----------  --------------
                                                    ----------  --------------
</TABLE>
 
- ------------------------
(1) Adjusted to reflect the issuance of the Debentures, assuming no exercise  of
    the Underwriter's over-allotment option.
 
(2) Short-term debt consists entirely of the current portion of long-term debt.
 
(3) Excludes  4,863,868 shares  reserved for  issuance pursuant  to ALZA's stock
    option, stock purchase and other incentive plans, 12,321,416 shares reserved
    for issuance  upon conversion  of  the LYONs,  966,697 shares  reserved  for
    issuance  upon the exercise  of outstanding warrants  exercisable at $65 per
    share on  or  before  December  31, 1999,  issued  in  connection  with  the
    formation  of TDC, 1,000,000  shares reserved for  issuance upon exercise of
    outstanding warrants exercisable at $25 per  share on or before January  31,
    1996  (which warrants  were exercised subsequent  to December  31, 1995) and
            shares reserved for issuance upon conversion of the Debentures.
 
                                       10
<PAGE>
                           DESCRIPTION OF DEBENTURES
 
    The Debentures will be issued under an Indenture, dated as of April   , 1996
(the "Indenture"), between the  Company and The Chase  Manhattan Bank, N.A.,  as
trustee  (the "Trustee").  A copy of  the form of  the Indenture is  filed as an
exhibit to the Registration  Statement of which this  Prospectus is a part.  The
following summaries of certain provisions of the Debentures and the Indenture do
not  purport  to be  complete and  are subject  to, and  are qualified  in their
entirety by  reference to,  all of  the  provisions of  the Debentures  and  the
Indenture,   including  the  definitions  therein  of  certain  terms.  Wherever
particular provisions  or  defined  terms  of the  Indenture  (or  the  form  of
Debenture  which is a part thereof) are  referred to, such provisions or defined
terms are  incorporated herein  by reference.  As used  in the  "Description  of
Debentures" references to "ALZA" refer to ALZA Corporation and not to any of its
subsidiaries.
 
GENERAL
 
    The   Debentures  will  represent  unsecured  general  obligations  of  ALZA
subordinate in  right  of  payment  to certain  other  obligations  of  ALZA  as
described  under "--  Subordination of  Debentures" and  convertible into Common
Stock as described under "-- Conversion  of Debentures." The Debentures will  be
limited   to  $400,000,000  aggregate  principal  amount  ($460,000,000  if  the
over-allotment  option  is  exercised   in  full),  will   be  issued  only   in
denominations  of $1,000 or any multiple thereof and will mature on            ,
2006, unless earlier redeemed at  the option of ALZA  or repurchased by ALZA  at
the option of the holder upon a Change in Control (as defined) or converted.
 
    The  Debentures will bear interest at the annual rate set forth on the cover
page hereof from              , 1996, payable semi-annually  on              and
           of  each year, commencing             , 1996, to holders of record at
the close of business on the preceding            and            ,  respectively
(other than with respect to a Debenture or portion thereof called for redemption
on a redemption date, or repurchased in connection with a Change in Control on a
Repurchase  Date (as defined  below) during the  period from the  record date to
(but excluding) the next succeeding interest payment date (in which case accrued
interest shall be payable to the extent required to the holder of the  Debenture
or  portion thereof redeemed or repurchased), or converted after the record date
and before the next succeeding interest  payment date except to the extent  that
at  the time such Debenture or portion thereof is submitted for conversion, such
Debenture or portion thereof  was required to be  accompanied by funds equal  to
interest  payable  on such  succeeding interest  payment  date on  the principal
amount so converted; see "-- Conversion of Debentures" below). Interest will  be
paid  by check mailed to such holders. Interest will be computed on the basis of
a 360-day year composed of twelve 30-day months.
 
    Principal and premium, if  any, will be payable,  and the Debentures may  be
presented for conversion, registration of transfer and exchange, without service
charge,  at the office of ALZA or its  agent maintained for such purposes in The
City of New York, which shall initially  be an office or agency of the  Trustee.
The Debentures will be convertible at the aforesaid offices of ALZA or its agent
maintained for such purpose.
 
    The Debentures will be issued only in fully registered form without coupons,
in denominations of $1,000 and any integral multiple thereof. The Debentures are
exchangeable  and transfers thereof will  be registered without charge therefor,
but ALZA may  require payment  of a  sum sufficient to  cover any  tax or  other
governmental charge payable in connection therewith.
 
    When  issued,  the Debentures  will be  a  new issue  of securities  with no
established trading market.  Although ALZA  has applied to  have the  Debentures
approved  for listing on the New York  Stock Exchange, there can be no assurance
that an active public market  will develop for the  Debentures or that, if  such
market develops, the market price will equal or exceed the public offering price
set  forth on  the cover  page of this  Prospectus. The  initial public offering
price of the Debentures will be  determined by negotiation between ALZA and  the
Underwriter  and may  not be  indicative of the  market price  of the Debentures
after the offering of the Debentures hereby.
 
    The Indenture does not  contain any financial  covenants or restrictions  on
the  payment of dividends, the incurrence of Senior Indebtedness or the issuance
or repurchase of securities of ALZA. The Indenture
 
                                       11
<PAGE>
contains no covenants  or other provisions  to afford protection  to holders  of
Debentures in the event of a highly leveraged transaction or a change in control
of ALZA except to the extent described under
"-- Repurchase at Option of Holders Upon Change in Control."
 
CONVERSION OF DEBENTURES
 
    The  holders of Debentures will be entitled,  at any time prior to the close
of business  on the  final maturity  date of  the Debentures,  subject to  prior
redemption  or repurchase,  to convert  any Debentures  or portions  thereof (in
denominations of $1,000 or multiples thereof) into Common Stock of ALZA, at  the
conversion  price set forth on  the cover page hereof,  subject to adjustment as
described below.  Except as  described  below, no  adjustment  will be  made  on
conversion  of any Debentures  for interest accrued thereon  or for dividends on
any Common  Stock  issued. If  any  Debentures  not called  for  redemption  are
converted  after a record date for the payment of interest and prior to the next
succeeding interest payment date, such  Debentures must be accompanied by  funds
equal  to the interest payable  on such succeeding interest  payment date on the
principal amount so converted. ALZA is  not required to issue fractional  shares
of  Common Stock upon conversion of Debentures  and, in lieu thereof, will pay a
cash adjustment based upon the market price of Common Stock on the last  Trading
Day  (as defined in the Indenture) prior to  the date of conversion. In the case
of Debentures called for redemption, conversion rights will expire at the  close
of  business on the business day preceding  the date fixed for redemption unless
ALZA defaults in  payment of  the redemption price.  A Debenture  in respect  of
which  a holder is exercising its option  to require repurchase upon a Change in
Control may be converted only if such holder withdraws its election to  exercise
its repurchase option in accordance with the terms of the Indenture.
 
    The  initial conversion price  is subject to  adjustment (under formulae set
forth in the Indenture) in certain events, including: (i) the issuance of Common
Stock as  a dividend  or distribution  on  Common Stock  of ALZA;  (ii)  certain
subdivisions  and combinations  of the Common  Stock; (iii) the  issuance to all
holders of Common Stock of certain rights or warrants to purchase Common  Stock;
(iv)  the distribution to all holders of Common Stock of shares of capital stock
of ALZA (other than Common Stock) or evidences of indebtedness of ALZA or assets
(including securities,  but  excluding  those rights,  warrants,  dividends  and
distributions  referred to above or paid  in cash); (v) distributions consisting
of cash, excluding any cash dividends or other distributions on the Common Stock
made in any  12-month period,  which when combined  with (A)  all such  all-cash
distributions made within such 12-month period in respect of which no adjustment
has been made plus (B) any cash and the fair market value of other consideration
payable  in respect of any tender offers by  ALZA or any of its subsidiaries for
Common Stock  concluded within  such  12-month period  in  respect of  which  no
adjustment  has been  made, do  not exceed  15% of  ALZA's market capitalization
(being the product of the Current Market Price (as defined in the Indenture)  of
the Common Stock times the number of shares of Common Stock then outstanding) on
the record date for such dividend or distribution, and excluding any dividend or
distribution  in connection with  the liquidation, dissolution  or winding up of
ALZA; and (vi) payment in respect of a  tender or exchange offer by ALZA or  any
subsidiary of ALZA for the Common Stock to the extent that the cash and value of
any  other  consideration included  in such  payment per  share of  Common Stock
exceeds the Current  Market Price  (as defined in  the Indenture)  per share  of
Common  Stock on the Trading Day next  succeeding the last date on which tenders
or exchanges may be made pursuant to such tender or exchange offer.
 
    No adjustment will be made with respect to clause (iii) or (iv) above if the
Debenture holders are to participate in such issuance or distribution on a basis
and with  notice  that ALZA's  Board  of Directors  determines  to be  fair  and
appropriate  in light of the basis on which holders of Common Stock participate.
In addition, no adjustment will be made with respect to clause (iv) above if, in
lieu of  such  adjustment,  the  Debenture holders,  upon  conversion,  will  be
entitled  to receive, in addition to the  shares of Common Stock into which such
Debentures are  convertible,  the  kind  and  amount  of  shares,  evidences  of
indebtedness  or assets comprising the distribution that such holders would have
received had they  converted their  Debentures immediately prior  to the  record
date for determining the stockholders entitled to receive such distribution.
 
                                       12
<PAGE>
    In  addition, the Indenture  provides that if  ALZA implements a stockholder
rights plan,  such  rights  plan  must  provide  that  upon  conversion  of  the
Debentures  the holders will  receive, in addition to  the Common Stock issuable
upon such conversion,  the rights  issued under such  plan (notwithstanding  the
occurrence  of an event causing such rights to separate from the Common Stock at
or prior to the time of conversion).
 
    In the case of  (i) any reclassification  or change of  the Common Stock  or
(ii)  a  consolidation,  merger  or  combination involving  ALZA  or  a  sale or
conveyance to another person of the property  and assets of ALZA as an  entirety
or  substantially as an entirety,  in each case as a  result of which holders of
Common Stock  shall  be  entitled  to receive  stock,  other  securities,  other
property  or assets  (including cash)  with respect to  or in  exchange for such
Common Stock, the holders  of the Debentures then  outstanding will be  entitled
thereafter  to convert  such Debentures  into the kind  and amount  of shares of
stock, other securities or other property or assets which they would have  owned
or  been entitled to receive  upon such reclassification, change, consolidation,
merger, combination, sale or conveyance had such Debentures been converted  into
Common  Stock immediately prior to such reclassification, change, consolidation,
merger, combination, sale  or conveyance  assuming that a  holder of  Debentures
would  not  have  exercised  any  rights of  election  as  to  the  stock, other
securities or other property or assets receivable in connection therewith.
 
    In the event of a taxable distribution to holders of Common Stock (or  other
transaction)  which  results  in any  adjustment  of the  conversion  price, the
holders of Debentures may, in certain circumstances, be deemed to have  received
a  distribution subject to  United States income  tax as a  dividend; in certain
other circumstances, the absence of such  an adjustment may result in a  taxable
dividend  to  the  holders of  Common  Stock.  See "Certain  Federal  Income Tax
Considerations."
 
    ALZA from  time to  time  may to  the extent  permitted  by law  reduce  the
conversion  price by any amount for any period  of at least 20 business days, in
which case ALZA shall give at least 15 days' notice of such reduction. ALZA may,
at its option,  make such  reductions in the  conversion price,  in addition  to
those  set forth above,  as the Board  of Directors deems  advisable to avoid or
diminish any income tax to holders  of Common Stock resulting from any  dividend
or  distribution of stock (or rights to acquire stock) or from any event treated
as  such   for  income   tax   purposes.  See   "Certain  Federal   Income   Tax
Considerations."
 
    No  adjustment  in  the  conversion  price  will  be  required  unless  such
adjustment would require a change of at least 1% in the conversion price then in
effect; PROVIDED that any adjustment that would otherwise be required to be made
shall be carried forward  and taken into account  in any subsequent  adjustment.
Except  as  stated above,  the conversion  price  will not  be adjusted  for the
issuance of Common Stock or any securities convertible into or exchangeable  for
Common Stock or carrying the right to purchase any of the foregoing.
 
OPTIONAL REDEMPTION BY ALZA
 
    The Debentures are not entitled to any sinking fund. At any time on or after
           ,  1999, the Debentures will be redeemable at ALZA's option in whole,
or from time to time in part, on at  least 30 and not more than 60 days'  notice
given  to the holders at  the following prices (expressed  as percentages of the
principal amount),  together,  in  each  case, with  accrued  interest  to,  but
excluding, the date fixed for redemption.
 
    If redeemed during the 12-month period beginning            :
 
<TABLE>
<CAPTION>
                                                                         REDEMPTION
YEAR                                                                        PRICE
- -----------------------------------------------------------------------  -----------
<S>                                                                      <C>
1999...................................................................       %
2000...................................................................       %
2001...................................................................       %
2002...................................................................       %
2003 and thereafter....................................................    100.00%
</TABLE>
 
provided that any semi-annual payment of interest becoming due on the date fixed
for  redemption shall be payable to the holders of record on the relevant record
date of the Debentures being redeemed.
 
                                       13
<PAGE>
    If fewer than all the Debentures are to be redeemed, the Trustee will select
the Debentures to be  redeemed pro rata or  by lot, or by  any other method  not
prohibited  by any stock exchange on which the Debentures are listed at the time
of such redemption.  If any  Debenture is  to be redeemed  in part  only, a  new
Debenture  or Debentures in  principal amount equal  to the unredeemed principal
portion thereof  will be  issued. If  a  portion of  a holder's  Debentures  are
selected  for partial redemption and, prior  to such redemption, such holder has
elected to convert a portion of such Debentures, such converted portion shall be
deemed to be taken from the portion selected for redemption.
 
REPURCHASE AT OPTION OF HOLDERS UPON CHANGE IN CONTROL
 
    The Indenture provides that  if a Change in  Control occurs, each holder  of
Debentures  shall  have the  right to  require  ALZA to  repurchase all  of such
holder's Debentures, or any portion of  the principal amount thereof that is  an
integral multiple of $1,000, on the date (the "Repurchase Date") that is 30 days
after  the date of the Company Notice (as defined), for cash at a price equal to
100% of the principal amount thereof  (the "Repurchase Price") plus accrued  and
unpaid  interest  to,  but excluding,  the  Repurchase Date;  provided  that any
semi-annual payment of  interest becoming due  on the Repurchase  Date shall  be
payable  to the holders of record on  the relevant record date of the Debentures
being repurchased.
 
    Within 15 days  after the  occurrence of  a Change  in Control,  ALZA or  at
ALZA's  request the  Trustee is obligated  to give  to all holders  of record of
Debentures a notice (the "Company Notice")  of the occurrence of such Change  in
Control  and of the repurchase right arising as a result thereof. ALZA must also
deliver a copy of the Company Notice to the Trustee. To exercise the  repurchase
right,  a holder of such Debentures must deliver to the Trustee on or before the
30th day after the  date of the  Company Notice written  notice of the  holder's
exercise  of such right, together with the  Debentures with respect to which the
right is being exercised.
 
    A "Change in Control" will be deemed to have occurred at such time after the
original issuance of Debentures as:
 
        (i) there is a report filed by any Person (as defined in the  Indenture,
    and  including any syndicate or group deemed  to be a "person" under Section
    13(d)(3) of the Exchange Act), other  than ALZA, any subsidiary of ALZA,  or
    any employee benefit plan of ALZA or any such subsidiary, on Schedule 13D or
    14D-1  pursuant to the Exchange Act,  disclosing that such Person has become
    the beneficial owner, directly  or indirectly, through  a purchase or  other
    acquisition  transaction or series  of transactions (other  than a merger or
    consolidation involving  ALZA), of  shares  of capital  stock of  ALZA  that
    entitle  such Person to exercise in excess  of 50% of the total voting power
    of all shares of  capital stock of  ALZA entitled to  vote generally in  the
    election of directors; or
 
        (ii)  there occurs  any consolidation  of ALZA  with, or  merger of ALZA
    into, any other Person, any merger of another Person into ALZA, or any  sale
    or  transfer of all  or substantially all  of the assets  of ALZA to another
    Person (other than (a) any such transaction pursuant to which the holders of
    the Common Stock  immediately prior  to such transaction  have, directly  or
    indirectly,   shares  of  capital  stock  of  the  continuing  or  surviving
    corporation immediately after such transaction which entitle such holders to
    exercise in excess of 50% of the total voting power of all shares of capital
    stock of the continuing or surviving corporation entitled to vote  generally
    in the election of directors and (b) any merger (1) which does not result in
    any  reclassification, conversion,  exchange or  cancellation of outstanding
    shares of  Common  Stock or  (2)  which is  effected  solely to  change  the
    jurisdiction  of incorporation  of ALZA  and results  in a reclassification,
    conversion or exchange  of outstanding  shares of Common  Stock solely  into
    shares of common stock).
 
    The  term "beneficial  owner" shall  be determined  in accordance  with Rule
13d-3 promulgated  by the  Commission  under the  Exchange  Act. To  the  extent
applicable,  ALZA will  comply with  the provisions of  Rule 13e-4  or any other
tender offer  rules,  and will  file  a Schedule  13E-4  or any  other  schedule
required  under such rules, in  connection with any offer  by ALZA to repurchase
Debentures at the option of the holders thereof upon a Change in Control.
 
                                       14
<PAGE>
    The Change in Control feature of the Debentures may in certain circumstances
make more difficult or discourage a takeover  of ALZA and, thus, the removal  of
incumbent  management. The  repurchase right is  not the  result of management's
knowledge of any effort to accumulate any  Common Stock or to obtain control  of
ALZA  by means of a merger, tender offer, solicitation, or otherwise, or part of
a plan by  management to adopt  a series of  anti-takeover provisions.  Instead,
this right is the result of negotiations between ALZA and the Underwriter.
 
    ALZA's  ability to repurchase Debentures upon  the occurrence of a Change in
Control is subject to limitations. If a  Change in Control were to occur,  there
can  be no  assurance that  ALZA would  have sufficient  financial resources, or
would be  able  to  arrange financing,  to  pay  the repurchase  price  for  all
Debentures  tendered by holders  thereof. Any future  credit agreements or other
agreements relating  to other  indebtedness (including  Senior Indebtedness)  to
which  ALZA becomes a party may  contain similar restrictions and provisions. In
the event a  Change in Control  occurs at a  time when ALZA  is prohibited  from
repurchasing  Debentures,  ALZA  could  seek  the  consent  of  its  lenders  to
repurchase the Debentures or could attempt to refinance the borrowings or  lease
arrangements  that  contain such  prohibition. If  ALZA does  not obtain  such a
consent or repay such borrowings or lease arrangements, ALZA would be prohibited
under the terms of such  agreements from repurchasing Debentures. Moreover,  the
occurrence  of a Change in Control or the repurchase of Debentures upon a Change
in Control may cause an event of default under Senior Indebtedness of ALZA. As a
result, in each case, any repurchase  of the Debentures would, absent a  waiver,
be  prohibited under  the subordination  provisions of  the Indenture  until the
Senior Indebtedness is paid in full. See "-- Subordination of Debentures"  below
and  "Risk  Factors --  Subordination." Any  failure by  ALZA to  repurchase the
Debentures when required following a Change in Control would result in an  Event
of  Default under the Indenture whether or  not such repurchase is prohibited by
the terms  of any  other agreement  or by  the subordination  provisions of  the
Indenture.  Any  such  default  may,  in  turn,  cause  a  default  under Senior
Indebtedness of ALZA.
 
SUBORDINATION OF DEBENTURES
 
    Indebtedness evidenced by the  Debentures will be  subordinated in right  of
payment,  as set  forth in the  Indenture, to the  prior payment in  full of all
existing  and  future  Senior  Indebtedness.  "Senior  Indebtedness"  means  the
principal of (and premium, if any) and unpaid interest on all present and future
(i)  indebtedness of ALZA for borrowed money; (ii) obligations of ALZA evidenced
by bonds, debentures, notes or similar instruments; (iii) indebtedness incurred,
assumed or guaranteed  by ALZA in  connection with  the acquisition by  it or  a
subsidiary  of  any  business,  properties  or  assets  (except  purchase  money
indebtedness classified as accounts payable under generally accepted  accounting
principles);  (iv) obligations  of ALZA  as lessee  under leases  required to be
capitalized on  the  balance  sheet  of  the  lessee  under  generally  accepted
accounting  principles and leases of property or assets made as part of any sale
and  lease-back  transaction  to  which  ALZA  is  a  party;  (v)  reimbursement
obligations  of ALZA in respect of letters of credit relating to indebtedness of
other obligations of  ALZA that qualify  as indebtedness or  obligations of  the
kind referred to in clauses (i) through (iv) above; and (vi) obligations of ALZA
under  direct or indirect guaranties in  respect of, and obligations (contingent
or otherwise)  to  purchase or  otherwise  acquire,  or otherwise  to  assure  a
creditor  against loss in  respect of, indebtedness or  obligations of others of
the kinds referred to in clauses (i) through (v) above, in each case unless,  in
the instrument creating or evidencing the indebtedness or obligation or pursuant
to  which the  same is  outstanding, it  is provided  that such  indebtedness or
obligation is not superior in right of payment to the Debentures. The Debentures
will rank pari passu in right of payment to the outstanding LYONs.
 
    By reason of such  subordination, in the  event of dissolution,  insolvency,
bankruptcy  or other similar  proceedings, upon any  distribution of assets, (i)
the holders of Senior Indebtedness  will be entitled to  be paid in full  before
payment  may be  made on the  Debentures and  the holders of  Debentures will be
required to  pay  over  their share  of  such  distribution in  respect  of  the
Debentures  to the holders of Senior Indebtedness until such Senior Indebtedness
is paid in full and (ii) unsecured creditors of ALZA who are not holders of  the
Debentures  or holders  of Senior Indebtedness  may recover  less, ratably, than
holders of Senior Indebtedness and may  recover more, ratably, than the  holders
of the Debentures.
 
                                       15
<PAGE>
    No  payment of the principal,  premium, if any, or  interest with respect to
any  Debentures  (including  but  not  limited  to  the  Redemption  Price,  the
Repurchase  Price, or on account of purchase or other acquisition of Debentures)
may be made, nor may  ALZA pay cash with respect  to the purchase price or  upon
conversion  of any Debenture (other  than cash in lieu  of fractional shares) or
acquire any Debentures except as set forth in the Indenture, if there shall have
occurred and be  continuing (i) a  default in  any payment with  respect to  any
Senior  Indebtedness of  ALZA or (ii)  an event  of default with  respect to any
Senior Indebtedness of  ALZA permitting  the holders thereof  to accelerate  the
maturity thereof.
 
    As  of December  31, 1995, the  principal amount of  Senior Indebtedness was
$850,000. There  are  no  restrictions  in the  Indenture  on  the  creation  of
additional   indebtedness,  including  Senior  Indebtedness.  In  addition,  the
Debentures will be effectively subordinated to all liabilities, including  trade
payables  and capitalized lease obligations, if any, of ALZA's subsidiaries. Any
right of ALZA to receive assets of  any of its subsidiaries upon liquidation  or
reorganization of the subsidiary (and the consequent right of the holders of the
Debentures  to participate in those assets)  will be effectively subordinated to
the claims of that subsidiary's creditors (including trade creditors), except to
the extent that ALZA is itself recognized  as a creditor of such subsidiary,  in
which  case  the claims  of ALZA  would  still be  subordinated to  any security
interests in  the  assets  of  such subsidiary  and  any  indebtedness  of  such
subsidiary senior to that held by ALZA.
 
EVENTS OF DEFAULT AND REMEDIES
 
    An Event of Default is defined in the Indenture as being: default in payment
when  due of the principal  of or premium, if  any, on the Debentures (including
any failure to repurchase the Debentures  on a Repurchase Date); default for  30
days  in payment of  any installment of  interest on the  Debentures; default by
ALZA for 60  days after notice  in the  observance or performance  of any  other
covenants  in the Indenture;  failure of ALZA  to make any  payment at maturity,
including any applicable grace period,  in respect of indebtedness for  borrowed
money  of ALZA,  which payment  is in an  amount in  excess of  $30 million, and
continuance of  such failure  for 30  days after  notice; default  by ALZA  with
respect to any indebtedness for borrowed money of ALZA, which default results in
acceleration  of any such indebtedness which is in an amount of in excess of $30
million without  such indebtedness  having  been paid  or discharged,  or  there
having  been deposited  in trust  a sum  of money  sufficient to  discharge such
indebtedness, or such acceleration having been rescinded or annulled, within  30
days  after  notice;  or  certain  events  involving  bankruptcy,  insolvency or
reorganization of ALZA.  The Indenture  provides that the  Trustee may  withhold
notice  to  the holders  of  Debentures of  any  default (except  in  payment of
principal, premium, if any, or interest  with respect to the Debentures) if  the
Trustee considers it in the interest of the holders of the Debentures to do so.
 
    The  Indenture provides that if an Event  of Default shall have occurred and
be continuing, the  Trustee or the  holders of  not less than  25% in  principal
amount  of  the Debentures  then outstanding  may declare  the principal  of and
accrued interest on  the Debentures to  be due and  payable immediately, but  if
ALZA shall cure all defaults (except the nonpayment of principal of, premium, if
any,  and  interest on  any of  the Debentures  which shall  have become  due by
acceleration) and certain  other conditions  are met,  with certain  exceptions,
such  declaration may be annulled and past defaults may be waived by the holders
of a majority of the principal amount of the Debentures then outstanding. In the
case of certain events of bankruptcy or insolvency, the principal of and accrued
interest on the Debentures shall automatically become and be immediately due and
payable.
 
    The holders  of  a majority  in  principal  amount of  the  Debentures  then
outstanding  shall  have the  right  to direct  the  time, method  and  place of
conducting any proceedings for any remedy  available to the Trustee, subject  to
certain limitations specified in the Indenture.
 
MODIFICATION OF THE INDENTURE
 
    The  Indenture contains provisions permitting ALZA and the Trustee, with the
consent of the holders of  not less than a majority  in principal amount of  the
Debentures  at the time outstanding, to modify the Indenture or any supplemental
indenture or the rights of  the holders of the  Debentures, except that no  such
modification  shall (i) extend  the fixed maturity of  any Debenture, reduce the
rate or extend the  time for payment of  interest thereon, reduce the  principal
amount thereof or premium, if any, thereon, reduce any
 
                                       16
<PAGE>
amount  payable  upon  redemption  thereof, change  the  obligation  of  ALZA to
repurchase any  Debenture upon  the occurrence  of any  Change in  Control in  a
manner  adverse  to holders  of  Debentures, impair  the  right of  a  holder to
institute suit  for  the payment  thereof,  change  the currency  in  which  the
Debentures are payable or impair the right to convert the Debentures into Common
Stock  subject to the terms set forth in the Indenture, or modify the provisions
of the Indenture with respect to the subordination of the Debentures in a manner
adverse to the holders  of the Debentures in  any material respect, without  the
consent  of each holder of a Debenture so affected, or (ii) reduce the aforesaid
percentage of Debentures  the holders of  which are required  to consent to  any
such  modifications, without the consent of the holders of all of the Debentures
then outstanding.
 
    Under the Indenture, ALZA, when authorized  by the resolutions of the  Board
of Directors, and the Trustee may, from time to time and at any time, enter into
an  indenture  or  supplemental indentures  for  one  or more  of  the following
purposes: (i) to  make provision with  respect to the  conversion rights of  the
holders  of the Debentures or the repurchase  obligations of ALZA, in each case,
pursuant to the terms of the Indenture; (ii) subject to the subordination of the
Debentures, to convey, transfer,  assign, mortgage or pledge  to the Trustee  as
security  for  the Debentures,  any property  or assets;  (iii) to  evidence the
succession of another corporation  to ALZA, or  successive successions, and  the
assumption  by  the  successor  corporation  of  the  covenants,  agreements and
obligations  of  ALZA  pursuant  to  the  Indenture;  (iv)  subject  to  certain
limitations,   to  add  to  the  covenants   of  ALZA  such  further  covenants,
restrictions or  conditions as  the Board  of Directors  and the  Trustee  shall
consider to be for the benefit of the holders of the Debentures, and to make the
occurrence,  or the occurrence and continuance, of  a Default (as defined in the
Indenture) in  any  such  additional covenants,  restrictions  or  conditions  a
Default  or an  Event of  Default (as defined  in the  Indenture) permitting the
enforcement of all or any of the several remedies provided in the Indenture; (v)
to cure any ambiguity or to correct or supplement any provision contained in the
Indenture  or  in  any  supplemental   indenture  which  may  be  defective   or
inconsistent  with  any other  provision contained  in the  Indenture or  in any
supplemental indenture, or to make such other provisions in regard to matters or
questions arising  under the  Indenture  which shall  not adversely  affect  the
interest  of any holder of  the Debentures; or (vi)  to evidence and provide for
the acceptance  of  appointment by  a  successor  Trustee with  respect  to  the
Debentures.
 
LIMITATION ON MERGER, SALE OR CONSOLIDATION
 
    ALZA  shall not consolidate or  merge with or into  any other corporation or
corporations  or,  directly  or  indirectly,  sell,  convey  or  lease  all   or
substantially  all  of its  property to  any other  corporation (whether  or not
affiliated with ALZA) unless the surviving or successor corporation in the event
of a merger or consolidation, or the corporation to which a sale, conveyance  or
lease  is made  (i) is an  entity organized and  existing under the  laws of the
United States, any state thereof or the District of Columbia and (ii)  expressly
assumes  by  supplemental  indenture  all  the  obligations  of  ALZA  under the
Debentures and the Indenture.
 
DISCHARGE OF INDENTURE
 
    ALZA may terminate substantially all of its obligations under the  Indenture
at  any  time  by  delivering  all outstanding  Debentures  to  the  Trustee for
cancellation and paying any other sums payable under the Indenture.
 
CONCERNING THE TRUSTEE
 
    The Chase Manhattan  Bank, N.A., as  Trustee under the  Indenture, has  been
appointed  by ALZA  as the paying  agent, conversion  agent, registrar, transfer
agent and custodian with regard to the Debentures. The Trustee or its affiliates
may from time to time in the  future provide banking and other services to  ALZA
in the ordinary course of its business.
 
GOVERNING LAW
 
    The  Indenture  and the  Debentures  will be  governed  by and  construed in
accordance with the laws of the State of New York.
 
                                       17
<PAGE>
                          DESCRIPTION OF CAPITAL STOCK
 
    ALZA's authorized capital  stock consists  of 300,000,000  shares of  Common
Stock,  par value  $.01 per  share, and 100,000  shares of  Preferred Stock, par
value $.01 per share (the "Preferred Stock"). No Preferred Stock is  outstanding
as of the date of this Prospectus. For recent prices of Common Stock, see "Price
Range of Common Stock and Dividend Policy."
 
    On  December  31,  1995,  there  were  82,506,419  shares  of  Common  Stock
outstanding. In addition there were  (i) 4,863,868 shares reserved for  issuance
pursuant  to ALZA's stock option, stock purchase and other incentive plans; (ii)
12,321,416 shares  reserved for  issuance upon  conversion of  the LYONs;  (iii)
966,697  shares reserved for issuance upon  the exercise of outstanding warrants
exercisable at  $65  per  share  on  or before  December  31,  1999,  issued  in
connection  with  the  formation  of TDC;  (iv)  1,000,000  shares  reserved for
issuance upon exercise of outstanding warrants  exercisable at $25 per share  on
or before January 31, 1996 (which warrants were exercised subsequent to December
31,  1995); and (v)         shares reserved for  issuance upon conversion of the
Debentures (      shares if the over-allotment option is exercised in full).
 
    Holders of Common Stock are entitled to one vote for each share held on  all
matters  submitted to a vote of stockholders.  Subject to any superior rights of
Preferred Stock, holders of Common  Stock are entitled to  share, on a pro  rata
basis,  in all assets  remaining after payment of  or provision for liabilities.
The shares of Common Stock are not subject to redemption. ALZA has the corporate
power to repurchase Common Stock.
 
    ALZA's Board  of  Directors  has  authority to  fix  or  alter  the  rights,
preferences, privileges, restrictions and other terms of any series of Preferred
Stock,  the number  of shares constituting  any such series  and the designation
thereof. ALZA has no present plans to issue any shares of Preferred Stock.
 
    ALZA has a classified  Board of Directors  with directors serving  staggered
terms  of three  years each.  Directors may not  be removed  by the stockholders
without cause. Special meetings  of the stockholders may  be called only by  the
Board  of Directors, the Chairman of the Board or the President. Nominations for
election of  directors  may  be  made  by the  Board  of  Directors  or  by  any
stockholder  of  record  entitled  to  vote  for  directors,  provided  that any
stockholder nominating a candidate for  director must deliver written notice  to
the Secretary of ALZA not later than the close of business 60 days in advance of
the  stockholders' meeting  or 10  days after  the date  on which  the notice of
meeting is first given  to stockholders, whichever  is later. The  stockholder's
notice  must set  forth certain information  concerning the  stockholder and the
stockholder's nominee. No  nominations for  director shall be  presented to  any
stockholders'  meeting if  not made in  compliance with  such procedures. ALZA's
bylaws also require that advance notice be given and certain other procedures be
followed with regard to any other business to be brought by a stockholder before
a meeting of  stockholders. Such procedures  include the delivery  of notice  of
such  proposal to the Secretary of ALZA not  later than the close of business 60
days in advance of the meeting or 10 days after the date on which the notice  of
meeting  is first given to stockholders, whichever is later. The notice must set
forth certain information concerning the stockholder and the proposed  business,
including  any  material  interest  of the  stockholder  in  that  business. The
provisions of  ALZA's  Certificate of  Incorporation  and bylaws  governing  the
number  and classification of the Board of Directors and certain related matters
cannot be amended without the approval of at least 75% of the Board of Directors
or the  affirmative vote  of  not less  than  80% of  the  voting power  of  the
outstanding shares of voting capital stock. The affirmative vote of at least 80%
of  the  voting power  of  the outstanding  shares  of voting  capital  stock is
required to approve certain business combinations.
 
    The provisions of ALZA's Certificate of Incorporation granting the Board  of
Directors  the authority to issue  Preferred Stock with such  terms as the Board
may determine, classifying  ALZA's Board, preventing  stockholders from  calling
special  meetings of ALZA's  stockholders, and requiring  supermajority votes in
the event of certain business combinations may inhibit any change in control  of
ALZA.
 
                                       18
<PAGE>
                   CERTAIN FEDERAL INCOME TAX CONSIDERATIONS
 
    The  following  is a  general discussion  of  certain United  States federal
income tax considerations relevant to holders of the Debentures. This discussion
is based  upon the  Internal Revenue  Code  of 1986,  as amended  (the  "Code"),
Treasury  Regulations, Internal  Revenue Service  ("IRS") rulings,  and judicial
decisions now  in effect,  all of  which are  subject to  change (possibly  with
retroactive  effect)  or  different interpretations.  This  discussion  does not
purport to deal with all aspects of federal income taxation that may be relevant
to a particular investor's  decision to purchase the  Debentures, and it is  not
intended  to be wholly applicable to all categories of investors, some of which,
such  as  dealers   in  securities,  banks,   insurance  companies,   tax-exempt
organizations and non-United States persons, may be subject to special rules. In
addition,  this discussion is limited to persons that purchase the Debentures in
this offering and hold the Debentures as "capital assets" within the meaning  of
Section 1221 of the Code.
 
    ALL  PROSPECTIVE PURCHASERS OF  THE DEBENTURES ARE  ADVISED TO CONSULT THEIR
OWN  TAX  ADVISORS  REGARDING  THE   FEDERAL,  STATE,  LOCAL  AND  FOREIGN   TAX
CONSEQUENCES  OF THE PURCHASE,  OWNERSHIP AND DISPOSITION  OF THE DEBENTURES AND
THE COMMON STOCK.
 
CONVERSION OF DEBENTURES INTO COMMON STOCK
 
    In general,  no gain  or loss  will  be recognized  for federal  income  tax
purposes on a conversion of the Debentures into shares of Common Stock. However,
cash  paid by  ALZA in lieu  of a fractional  share of Common  Stock will likely
result in taxable gain (or loss), which  will be capital gain (or loss), to  the
extent  that the amount of such cash exceeds  (or is exceeded by) the portion of
the adjusted basis  of the  Debenture allocable  to such  fractional share.  The
adjusted  basis of shares of Common Stock  received on conversion will equal the
adjusted basis of the  Debenture converted, reduced by  the portion of  adjusted
basis  allocated to any fractional share of Common Stock exchanged for cash. The
holding period  of a  holder in  the Common  Stock received  on conversion  will
include the period during which the converted Debentures were held.
 
    The  Conversion  Price  of the  Debentures  is subject  to  adjustment under
certain  circumstances.  See  "Description   of  Debentures  --  Conversion   of
Debentures."  Section  305  of  the Code  and  the  Treasury  Regulations issued
thereunder may  treat  the  holders  of the  Debentures  as  having  received  a
constructive  distribution if and to the  extent that certain adjustments in the
Conversion Price  that  may  occur in  limited  circumstances  (particularly  an
adjustment  to reflect a  taxable dividend to holders  of Common Stock) increase
the proportionate interest of a holder of Debentures in the fully diluted Common
Stock, whether or not such holder ever exercises its conversion privilege. As  a
result  of such a  constructive distribution the holders  of Debentures may have
ordinary income to the extent of ALZA's  current earnings and profits as of  the
end  of the taxable  year to which the  constructive distribution relates and/or
ALZA's accumulated  earnings and  profits.  Moreover, if  there  is not  a  full
adjustment to the Conversion Price of the Debentures to reflect a stock dividend
or  other  event  increasing  the  proportionate  interest  of  the  holders  of
outstanding Common Stock  in the assets  or earnings and  profits of ALZA,  then
such  increase in the proportionate interest of  the holders of the Common Stock
generally will be treated as a distribution to such holders, taxable as ordinary
income to the extent of ALZA's current earnings and profits as of the end of the
taxable year  to  which  the constructive  distribution  relates  and/or  ALZA's
accumulated earnings and profits.
 
SALE, EXCHANGE OR RETIREMENT OF DEBENTURES
 
    Each  holder of  Debentures generally will  recognize gain or  loss upon the
sale, exchange, redemption, repurchase,  retirement or other disposition  (other
than  conversion) of the Debentures measured  by the difference (if any) between
(i) the  amount of  cash and  the fair  market value  of any  property  received
(except  to the extent that  such cash or other  property is attributable to the
payment of accrued interest not previously included in income, which amount will
be taxable as ordinary income) and (ii) the holder's adjusted tax basis in those
Debentures (including any market discount  previously included in income by  the
holder).  Each holder of Common Stock, in general, into which the Debentures are
converted, in general,  will recognize  gain or  loss upon  the sale,  exchange,
redemption,  or  other  disposition of  the  Common Stock  measured  under rules
similar to those described in the preceding sentence for the Debentures. Special
rules may apply  to redemptions of  Common Stock which  may result in  different
treatment. Any such gain or
 
                                       19
<PAGE>
loss  recognized on  the sale,  exchange, redemption,  repurchase, retirement or
other disposition of a Debenture or share of Common Stock should, in general, be
capital gain  or  loss and  would  be long-term  capital  gain or  loss  if  the
Debenture or the Common Stock was held for more than one year at the time of the
disposition. A holder's initial basis in a Debenture will be the cash price paid
therefor.
 
BACK-UP WITHHOLDING
 
    A  holder  of  Debentures  or  Common  Stock  may  be  subject  to  "back-up
withholding" from a reportable payment at a  rate of 31 percent if, among  other
things,  (i)  the holder  fails to  furnish  a social  security number  or other
taxpayer identification  number ("TIN")  to ALZA  certified under  penalties  of
perjury  within  a reasonable  time  after the  request  therefor; (ii)  the IRS
notifies ALZA that the TIN furnished by  the holder is incorrect; (iii) the  IRS
notifies ALZA that backup withholding should be commenced because the holder has
failed to properly report interest or dividends; or (iv) when required to do so,
the  holder fails to certify under penalties  of perjury that such holder is not
subject to  backup withholding  or that  the TIN  provided to  ALZA is  correct.
Reportable  payments  include interest  payments,  dividend payments  and, under
certain circumstances, principal payments on  the Debentures. A holder who  does
not  provide ALZA with its correct TIN  also may be subject to penalties imposed
by the IRS. Any  amount withheld from  a payment to a  holder under the  back-up
withholding  rules  is  creditable  against  the  holder's  federal  income  tax
liability. Back-up withholding will not apply, however, with respect to payments
made to certain  holders, including corporations,  tax-exempt organizations  and
certain  foreign persons, provided  their exemption from  back-up withholding is
properly established.
 
    ALZA will report to the  holders of Debentures and  Common Stock and to  the
IRS  the amount  of any  "reportable payments"  for each  calendar year  and the
amount of tax withheld, if any, with respect to such payments.
 
                                       20
<PAGE>
                                  UNDERWRITING
 
    Merrill Lynch, Pierce, Fenner &  Smith Incorporated (the "Underwriter")  has
agreed,  subject  to the  terms  and conditions  of  the Purchase  Agreement, to
purchase $400,000,000 aggregate  principal amount of  the Debentures from  ALZA.
The  Underwriter  has advised  ALZA  that it  proposes  to offer  the Debentures
directly to the public at the offering price set forth on the cover page of this
Prospectus. After  the  initial  public  offering, the  offering  price  may  be
changed.  The Debentures  are offered subject  to receipt and  acceptance by the
Underwriter and  to certain  other  conditions, including  the right  to  reject
orders in whole or in part.
 
    ALZA  has granted the  Underwriter an option, exercisable  for 30 days after
the date  of  this Prospectus,  to  purchase  up to  an  additional  $60,000,000
principal  amount of Debentures to cover over-allotments, if any, at the initial
public offering price less the underwriting  discount as set forth on the  cover
page of this Prospectus.
 
    ALZA  has agreed to  indemnify the Underwriter  against certain liabilities,
including liabilities under the  Securities Act, and  to contribute to  payments
the Underwriter may be required to make in respect thereof.
 
    ALZA  has agreed with the Underwriter not  to sell, offer to sell, grant any
option for  the sale  of, or  otherwise dispose  of or  transfer any  securities
similar to the Debentures or any Common Stock or any securities convertible into
or  exercisable or exchangeable for such securities or Common Stock for a period
of 90 days after the date of  this Prospectus without the prior written  consent
of  the Underwriter other  than (i) Common  Stock issuable upon  the exchange of
Debentures offered hereby; (ii) Common Stock issued or sold pursuant to employee
benefit plans and dividend  reinvestment plans; (iii)  Common Stock issued  upon
exercise  of currently outstanding options,  warrants or convertible securities;
(iv) certain privately issued restricted securities; or (v) Common Stock  issued
in  connection with investments in, acquisitions  of, or mergers or combinations
with other companies.
 
    Application has  been made  to list  the Debentures  on the  New York  Stock
Exchange.
 
    From  time  to  time the  Underwriter  and  certain of  its  affiliates have
performed, and  may  in the  future  perform, investment  banking  or  financial
advisory services for ALZA.
 
                                 LEGAL MATTERS
 
    The  validity of the  issuance of the Debentures  offered hereby and certain
legal matters with respect  to United States  federal income tax  considerations
will  be passed  upon for ALZA  by Heller  Ehrman White &  McAuliffe, Palo Alto,
California, ALZA's counsel. Skadden, Arps,  Slate, Meagher & Flom, Los  Angeles,
California,  will act as counsel to the Underwriter. Julian N. Stern, a director
and the Secretary of ALZA,  is a member of Heller  Ehrman White & McAuliffe.  At
April  1, 1996, attorneys  in that firm  involved in the  representation of ALZA
owned beneficially  138,379  shares  of Common  Stock  (including  options,  but
excluding warrants to purchase Common Stock).
 
                                    EXPERTS
 
    The  consolidated financial  statements and financial  statement schedule of
ALZA Corporation appearing or incorporated by reference in ALZA's Annual  Report
(Form  10-K) for the year ended December 31,  1995, have been audited by Ernst &
Young LLP, independent auditors, as set forth in their reports thereon  included
or  incorporated by reference therein and incorporated herein by reference. Such
consolidated  financial  statements   and  financial   statement  schedule   are
incorporated  herein by reference  in reliance upon such  reports given upon the
authority of such firm as experts in accounting and auditing.
 
                                       21
<PAGE>
- -------------------------------------------
                                     -------------------------------------------
- -------------------------------------------
                                     -------------------------------------------
 
    NO  DEALER, SALESPERSON OR OTHER INDIVIDUAL  HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR  MAKE ANY  REPRESENTATIONS NOT  CONTAINED IN  THIS PROSPECTUS  IN
CONNECTION  WITH THE OFFERING COVERED BY THIS PROSPECTUS. IF GIVEN OR MADE, SUCH
INFORMATION OR REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED
BY ALZA OR  THE UNDERWRITER.  THIS PROSPECTUS DOES  NOT CONSTITUTE  AN OFFER  TO
SELL,  OR  A SOLICITATION  OF AN  OFFER TO  BUY, ANY  SECURITIES OTHER  THAN THE
REGISTERED SECURITIES TO WHICH  IT RELATES, OR AN  OFFER OR SOLICITATION IN  ANY
JURISDICTION  WHERE, OR TO ANY PERSON TO WHOM, IT IS UNLAWFUL TO MAKE SUCH OFFER
OR SOLICITATION.  NEITHER THE  DELIVERY OF  THIS PROSPECTUS  NOR ANY  SALE  MADE
HEREUNDER  SHALL, UNDER ANY CIRCUMSTANCES, CREATE  AN IMPLICATION THAT THERE HAS
NOT BEEN ANY CHANGE IN THE FACTS SET FORTH IN THIS PROSPECTUS OR IN THE  AFFAIRS
OF ALZA SINCE THE DATE HEREOF.
 
                            ------------------------
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                    PAGE
                                                    -----
<S>                                              <C>
Available Information..........................           2
Incorporation of Certain Documents by
 Reference.....................................           2
Prospectus Summary.............................           3
Risk Factors...................................           7
Use of Proceeds................................           9
Price Range of Common Stock and Dividend
 Policy........................................           9
Capitalization.................................          10
Description of Debentures......................          11
Description of Capital Stock...................          18
Certain Federal Income Tax Considerations......          19
Underwriting...................................          21
Legal Matters..................................          21
Experts........................................          21
</TABLE>
 
                                  $400,000,000
 
                                     [LOGO]
 
                            % CONVERTIBLE SUBORDINATED
                              DEBENTURES DUE 2006
 
                            ------------------------
 
                                   PROSPECTUS
 
                            ------------------------
 
                              MERRILL LYNCH & CO.
 
                                           , 1996
 
- -------------------------------------------
                                     -------------------------------------------
- -------------------------------------------
                                     -------------------------------------------
<PAGE>
                                    PART II
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 14.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.
 
    The  expenses  in  connection  with the  issuance  and  distribution  of the
securities being registered, other than underwriting discounts and  commissions,
are estimated as follows:
 
<TABLE>
<CAPTION>
<S>                                                              <C>
Securities and Exchange Commission Registration Fee............  $ 158,621
New York Stock Exchange Listing Application Fee................      1,500
Blue Sky Fees and Expenses*....................................     20,000
NASD Registration Fee..........................................     30,500
Legal Fees and Expenses*.......................................     60,000
Accounting Fees and Expenses*..................................     60,000
Printing and Engraving Expenses*...............................     65,000
Trustee and Registrar Fees and Expenses*.......................      6,000
Miscellaneous*.................................................     98,379
                                                                 ---------
      Total....................................................  $ 500,000
                                                                 ---------
                                                                 ---------
</TABLE>
 
- ------------------------
* Estimated
 
ITEM 15.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.
 
    Section  102 of the Delaware General Corporation Law allows a corporation to
eliminate  the  personal  liability  of  directors  of  a  corporation  to   the
corporation  or to any of  its stockholders for monetary  damage for a breach of
his or her fiduciary duty as a  director, except in the case where the  director
breached  his or her  duty of loyalty, failed  to act in  good faith, engaged in
intentional misconduct or knowingly violated a law, authorized the payment of  a
dividend  or approved a stock repurchase  in violation of Delaware corporate law
or obtained an  improper personal benefit.  ALZA's Certificate of  Incorporation
contains  a provision that eliminates directors' personal liability as set forth
above.
 
    Section 145 of the  Delaware General Corporation  Law, as amended,  provides
that  a  corporation may  indemnify  any person  who  was or  is  a party  or is
threatened to be made  a party to any  threatened, pending or completed  action,
suit or proceeding, whether civil, criminal, administrative or investigative, by
reason  of the fact  that he or she  is or was a  director, officer, employee or
agent of the corporation or is or was serving at its request in such capacity in
another  corporation  or  business   association  against  expenses   (including
attorneys'  fees), judgments, fines and amounts  paid in settlement actually and
reasonably incurred  by him  or her  in  connection with  such action,  suit  or
proceeding if he or she acted in good faith and in a manner he or she reasonably
believed  to be in or not opposed to  the best interests of the corporation and,
with respect to any  criminal action or proceeding,  had no reasonable cause  to
believe his or her conduct was unlawful.
 
    In  addition, Article 9  of ALZA's Certificate  of Incorporation provides as
follows:
 
    LIMITATION OF LIABILITY AND INDEMNIFICATION OF DIRECTORS.
 
    (a) ELIMINATION  OF CERTAIN  LIABILITY OF  DIRECTORS.   No director  of  the
corporation  shall be personally  liable to the  corporation or its stockholders
for monetary damages  for breach  of fiduciary duty  as a  director, except  for
liability  (i)  for  any  breach  of  the  director's  duty  of  loyalty  to the
corporation or its stockholders, (ii) for acts or omissions not in good faith or
which involve intentional misconduct or a knowing violation of law, (iii)  under
Section  174 of the Delaware General Corporation Law or (iv) for any transaction
from which the director derived an improper personal benefit.
 
                                      II-1
<PAGE>
    (b) INDEMNIFICATION AND INSURANCE.
 
        (1) RIGHT TO INDEMNIFICATION.  Each person who was or is made a party or
    is threatened to be made  a party to or is  involved in any action, suit  or
    proceeding,  whether  civil,  criminal, administrative  or  investigative (a
    "proceeding"), because he or she, or a person of whom he or she is the legal
    representative, is or was a director or officer of the corporation or is  or
    was  serving  at the  request  of the  corporation  as a  director, officer,
    employee or agent of another corporation or of a partnership, joint venture,
    trust or  other  enterprise  (including service  with  respect  to  employee
    benefit  plans), whether the basis of the proceeding is alleged action in an
    official capacity as a director, officer, employee or agent or in any  other
    capacity  while serving as a director,  officer, employee or agent, shall be
    indemnified and  held harmless  by  the corporation  to the  fullest  extent
    authorized  by the Delaware  General Corporation Law, as  the same exists or
    may hereafter be amended (but,  in the case of  any such amendment, only  to
    the  extent that such  amendment permits the  corporation to provide broader
    indemnification rights than  that law permitted  the corporation to  provide
    before  such amendment), against all  expense, liability and loss (including
    attorneys' fees,  judgments, penalties,  fines, Employee  Retirement  Income
    Security  Act of 1974 excise  taxes or penalties, and  amounts paid or to be
    paid in  settlement)  reasonably incurred  or  suffered by  such  person  in
    connection   therewith;  provided,  however,   that  the  corporation  shall
    indemnify any  such  person seeking  indemnification  in connection  with  a
    proceeding (or part thereof) initiated by such person only if the proceeding
    (or  part  thereof)  was  authorized  by  the  Board  of  Directors  of  the
    corporation. Such  indemnification shall  continue as  to a  person who  has
    ceased  to be a director, officer, employee  or agent and shall inure to the
    benefit of his  or her  heirs, executors  and administrators.  The right  to
    indemnification  conferred by this  Section shall be  a contract right which
    may not be retroactively amended and shall  include the right to be paid  by
    the  corporation the expenses  incurred in defending  any such proceeding in
    advance of its final disposition;  provided, however, that, if the  Delaware
    General Corporation Law requires, the payment of such expenses incurred by a
    director or officer in his or her capacity as a director or officer (and not
    in  any other capacity  in which service  was or is  rendered by such person
    while a director  or officer,  including, without  limitation, service  with
    respect  to an employee benefit plan) in advance of the final disposition of
    the proceeding shall  be made only  upon delivery to  the corporation of  an
    undertaking,  by or  on behalf  of such  director or  officer, to  repay all
    amounts so advanced if ultimately it shall be determined that such  director
    or  officer  is  not  entitled  to  be  indemnified  under  this  Section or
    otherwise. The corporation may, by action of its Board of Directors, provide
    indemnification to employees  and agents  of the corporation  with the  same
    scope and effect as the indemnification of directors and officers.
 
        (2)  NONEXCLUSIVITY OF  RIGHTS.   The right  to indemnification  and the
    payment of expenses  incurred in defending  a proceeding in  advance of  its
    final  disposition conferred in  this Section shall not  be exclusive of any
    other right  which  any person  may  have  or hereafter  acquire  under  any
    statute,  provision of this Certificate  of Incorporation, bylaw, agreement,
    vote of stockholders or disinterested directors, or otherwise.
 
        (3) INSURANCE.  The corporation may maintain insurance, at its  expense,
    to  protect  itself and  any  director, officer,  employee  or agent  of the
    corporation or  another corporation,  partnership, joint  venture, trust  or
    other enterprise against any such expense, liability or loss, whether or not
    the  corporation would have the power  to indemnify such person against such
    expense, liability or loss under the Delaware General Corporation Law.
 
    ALZA has purchased  directors and officers  liability insurance which  would
indemnify  the directors  and officers  of ALZA  against damages  arising out of
certain kinds  of  claims  which might  be  made  against them  based  on  their
negligent acts or omissions while acting in their capacity as such.
 
                                      II-2
<PAGE>
ITEM 16.  EXHIBITS.
 
<TABLE>
<C>        <S>
      1.1  Form of Purchase Agreement between the Registrant and the Underwriter
      4.1  Form of Certificate for the Debenture (included in Exhibit 4.2)
      4.2  Form of Indenture between the Registrant and The Chase Manhattan Bank, N.A. as
            Trustee, relating to the Debentures
      5.1  Opinion of Heller Ehrman White & McAuliffe as to legality of Debentures and
            Common Stock
      8.1  Opinion of Heller Ehrman White & McAuliffe with respect to certain tax matters
     12.1  Computation of Ratios of Earnings to Fixed Charges
     23.1  Consent of Ernst & Young LLP, Independent Auditors
     23.2  Consent of Heller Ehrman White & McAuliffe (included in its opinion filed as
            Exhibit 5.1 to this Registration Statement)
     23.3  Consent of Heller Ehrman White & McAuliffe (included in its opinion filed as
            Exhibit 8.1 to this Registration Statement)
     24.1  Power of Attorney (included on page II-4)
     25.1  Statement of Eligibility and Qualification under the Trust Indenture Act of 1939
            on Form T-1 of The Chase Manhattan Bank, N.A. to act as Trustee under the
            Indenture
</TABLE>
 
ITEM 17.  UNDERTAKINGS.
 
    The   undersigned  Registrant  hereby  undertakes   that,  for  purposes  of
determining any liability  under the  Securities Act  of 1933,  as amended  (the
"Securities  Act"), each  filing of the  Registrant's annual  report pursuant to
Section 13(a)  or Section  15(d) of  the  Securities Exchange  Act of  1934,  as
amended (and, where applicable, each filing of an employee benefit plan's annual
report  pursuant to  Section 15(d)  of the Securities  Exchange Act  of 1934, as
amended) that is incorporated by reference in this registration statement  shall
be  deemed to be a new registration statement relating to the securities offered
herein, and the offering of such securities  at that time shall be deemed to  be
the initial bona fide offering thereof.
 
    Insofar  as indemnification for liabilities under  the Securities Act may be
permitted to  directors,  officers and  controlling  persons of  the  Registrant
pursuant  to  the  provisions described  in  Item  15 above,  or  otherwise, the
Registrant has been advised that in  the opinion of the Securities and  Exchange
Commission  such indemnification  is against public  policy as  expressed in the
Securities Act and is, therefore, unenforceable.  In the event that a claim  for
indemnification  against  such  liabilities  (other  than  the  payment  by  the
Registrant of expenses incurred  or paid by a  director, officer or  controlling
person  of  the Registrant  in the  successful  defense of  any action,  suit or
proceeding) is  asserted by  such  director, officer  or controlling  person  in
connection  with the securities being registered, the Registrant will, unless in
the opinion of its counsel the matter has been settled by controlling precedent,
submit to  a court  of appropriate  jurisdiction the  question of  whether  such
indemnification  by it is  against public policy as  expressed in the Securities
Act and will be governed by the final adjudication of such issue.
 
    The undersigned Registrant hereby undertakes that:
 
    (1) For purposes of determining any liability under the Securities Act,  the
information  omitted  from  the  form  of  prospectus  filed  as  part  of  this
registration statement in  reliance upon Rule  430A and contained  in a form  of
prospectus  filed by the Registrant pursuant to  Rule 424(b)(1) or (4) or 497(h)
under the  Securities  Act shall  be  deemed to  be  part of  this  registration
statement as of the time it was declared effective.
 
    (2)  For the purpose of determining  any liability under the Securities Act,
each post-effective amendment that contains a form of prospectus shall be deemed
to be a new registration statement  relating to the securities offered  therein,
and  the offering  of such  securities at that  time shall  be deemed  to be the
initial bona fide offering thereof.
 
                                      II-3
<PAGE>
                                   SIGNATURES
 
    Pursuant  to the requirements of the  Securities Act of 1933, the Registrant
certifies that it has  reasonable grounds to  believe that it  meets all of  the
requirements  for  filing on  Form  S-3 and  has  duly caused  this Registration
Statement to  be  signed  on  its behalf  by  the  undersigned,  thereunto  duly
authorized, in the city of Palo Alto, State of California, on April 8, 1996.
 
                                                     ALZA CORPORATION
 
                                                     /S/ ERNEST MARIO
                                          --------------------------------------
                                                     Dr. Ernest Mario,
                                                 Co-Chairman and Chief Executive
                                          Officer
 
                               POWER OF ATTORNEY
 
    Each  person  whose signature  appears  below constitutes  and  appoints Dr.
Ernest Mario  and Bruce  C. Cozadd  his true  and lawful  attorneys-in-fact  and
agents,  each acting alone, with full  power of substitution and resubstitution,
for him and in his name, place and stead, in any and all capacities, to sign any
or all  amendments (including  post-effective  amendments) to  the  Registration
Statement,  and to sign any registration statement for the same offering covered
by this Registration Statement that is  to be effective upon filing pursuant  to
Rule 462(b) under the Securities Act of 1933, as amended, and all post-effective
amendments  thereto, and to  file the same,  with all exhibits  thereto, and all
documents in connection therewith, with the Securities and Exchange  Commission,
granting  unto said attorneys-in-fact and agents, full power and authority to do
and perform each and every act and  thing requisite and necessary to be done  in
and  about the  premises, as fully  to all intents  and purposes as  he might or
could  do   in  person,   hereby  ratifying   and  confirming   all  that   said
attorneys-in-fact  and agents,  each acting alone,  or his or  her substitute or
substitutes, may lawfully do or cause to be done by virtue hereof.
 
    Pursuant  to  the  requirements  of   the  Securities  Act  of  1933,   this
Registration  Statement has  been signed below  by the following  persons in the
capacities and on the dates indicated:
 
<TABLE>
<CAPTION>
               SIGNATURE                                      TITLE                                 DATE
- ---------------------------------------  ------------------------------------------------  ----------------------
 
<C>                                      <S>                                               <C>
          /S/ ALEJANDRO ZAFFARONI
    -------------------------------      Co-Chairman of the Board and Director                      April 8, 1996
        Dr. Alejandro Zaffaroni
               /S/ ERNEST MARIO          Co-Chairman of the Board, Chief Executive
    -------------------------------      Officer and Director (Principal Executive                  April 8, 1996
           Dr. Ernest Mario              Officer)
            /S/ WILLIAM G. DAVIS
    -------------------------------      Director                                                   April 8, 1996
           William G. Davis
    -------------------------------      Director                                                          , 1996
           Martin S. Gerstel
            /S/ ROBERT J. GLASER
    -------------------------------      Director                                                   April 8, 1996
         Dr. Robert J. Glaser
             /S/ DEAN O. MORTON
    -------------------------------      Director                                                   April 8, 1996
            Dean O. Morton
         /S/ RUDOLPH A. PETERSON
    -------------------------------      Director                                                   April 8, 1996
          Rudolph A. Peterson
                /S/ ISAAC STEIN
    -------------------------------      Director                                                   April 8, 1996
              Isaac Stein
             /S/ JULIAN N. STERN
    -------------------------------      Director                                                   April 8, 1996
            Julian N. Stern
             /S/ BRUCE C. COZADD
    -------------------------------      Vice President and Chief Financial Officer                 April 8, 1996
            Bruce C. Cozadd              (Principal Financial and Accounting Officer)
</TABLE>
 
                                      II-4

<PAGE>


                                  ALZA CORPORATION 

                               (A Delaware corporation)

                  ___% Convertible Subordinated Debentures due 2006


                                  PURCHASE AGREEMENT


                                                                   _______, 1996

MERRILL LYNCH & CO.
Merrill Lynch, Pierce, Fenner & Smith
             Incorporated

Merrill Lynch World Headquarters
North Tower
World Financial Center
New York, New York  10281-1209

Ladies and Gentlemen:

     ALZA Corporation, a Delaware corporation (the "Company"), confirms its 
agreement with Merrill Lynch & Co., Merrill Lynch, Pierce, Fenner & Smith 
Incorporated (the "UNDERWRITER"), with respect to the issue and sale by the 
Company and the purchase by the Underwriter, of $400,000,000 aggregate 
principal amount of the Company's ___% Convertible Subordinated Debentures 
due 2006 (the "DEBENTURES") and with respect to the grant by the Company to 
the Underwriter of the option described in Section 2(b) hereof to purchase 
all or any part of an additional $60,000,000 aggregate principal amount of 
its Debentures solely to cover over-allotments.  The aforesaid $400,000,000 
aggregate principal amount of Debentures (the "INITIAL SECURITIES") to be 
purchased by the Underwriter and all or any part of the $60,000,000 
aggregate principal amount of the Debentures subject to the over-allotment 
option described in Section 2(b) hereof (the "OPTION SECURITIES") are 
collectively referred to herein as the

<PAGE>

"SECURITIES."  The Securities are to be issued pursuant to an indenture, in
substantially the form filed as an exhibit to the Registration Statement, to be
dated as of April __, 1996 (the "INDENTURE"), between the Company and The Chase
Manhattan Bank, N.A., as trustee (the "TRUSTEE").  

     The Securities are convertible into shares of Common Stock, par value $0.01
per share, of the Company (the "COMMON STOCK") at any time prior to the close of
business on the maturity date of the Securities.

     Prior to the purchase and public offering of the Securities by the
Underwriter, the Company and the Underwriter shall enter into an agreement
substantially in the form of Exhibit A hereto (the "PRICING AGREEMENT").  The
Pricing Agreement may take the form of an exchange of any standard form of
written telecommunication between the Company and the Underwriter and shall
specify such applicable information as is indicated in Exhibit A hereto.  The
offering of the Securities will be governed by this Agreement, as supplemented
by the Pricing Agreement.  From and after the date of the execution and delivery
of the Pricing Agreement, this Agreement shall be deemed to incorporate the
Pricing Agreement.

     The Company has filed with the Securities and Exchange Commission (the
"COMMISSION") a registration statement on Form S-3 (No. 333-_____) and a related
preliminary prospectus for the registration of the Securities, and the shares of
Common Stock to be issued upon conversion of the Securities, under the
Securities Act of 1933, as amended (the "1933 ACT"), has filed such amendments
thereto, if any, and such amended preliminary prospectuses as may have been
required to the date hereof, and will file such additional amendments thereto
and such amended prospectuses as may hereafter be required.  Such registration
statement (as amended, if applicable), in the form declared effective by the
Commission, and the prospectus constituting a part thereof (including in each
case all documents, if any, to the extent incorporated or deemed to be
incorporated by reference therein and the information, if any, deemed to be part
of the registration statement pursuant to Rule 430A(b) of the rules and
regulations of the Commission under the 1933 Act (the "1933 ACT REGULATIONS")),
as from time to time amended or supplemented pursuant to the 1933 Act, the
Securities


                                          2

<PAGE>

Exchange Act of 1934, as amended (the "1934 ACT"), or otherwise, are hereinafter
referred to as the "REGISTRATION STATEMENT" and the "PROSPECTUS", respectively,
except that if any revised prospectus shall be provided to the Underwriter by
the Company for use in connection with the offering of the Securities which
differs from the Prospectus on file at the Commission at the time the
Registration Statement becomes effective (whether or not such revised prospectus
is required to be filed by the Company pursuant to Rule 424(b) of the 1933 Act
Regulations), the term "Prospectus" shall refer to such revised prospectus from
and after the time it is first provided to the Underwriter for such use.  All
references in this Agreement to financial statements and schedules and other
information which is "contained," "included" or "stated" in the Registration
Statement or the Prospectus (and all  other references of like import) shall be
deemed to mean and include all such financial statements and schedules and other
information which is incorporated by reference in, or deemed to be part of, the
Registration Statement or the Prospectus, as the case may be; and all references
in this Agreement to amendments or supplements to the Registration Statement or
the Prospectus shall be deemed to mean and include the filing of any document
under the 1934 Act after the date of this Agreement which is or is deemed to be
incorporated by reference in the Registration Statement or the Prospectus, as
the case may be.

     The Company understands that the Underwriter proposes to make a public
offering of the Securities as soon as it deems advisable after this Agreement
has been executed and delivered and the Indenture has been qualified under the
Trust Indenture Act of 1939, as amended (the "1939 ACT").

     SECTION 1.     REPRESENTATIONS AND WARRANTIES.

     (a)  REPRESENTATIONS AND WARRANTIES BY THE COMPANY.  The Company represents
and warrants to the Underwriter as of the date hereof, as of the date of the
Pricing Agreement (such later date being hereinafter referred to as the
"REPRESENTATION DATE") and as of the Closing Date and agrees with the
Underwriter, as follows:

          (i)       COMPLIANCE WITH REGISTRATION REQUIREMENTS.  The Company
     meets the requirements for use of Form


                                          3

<PAGE>

     S-3 under the 1933 Act, and at the time the Registration Statement becomes
     effective and at the Representation Date, the Registration Statement will
     comply in all material respects with the requirements of the 1933 Act, the
     1933 Act Regulations, the 1939 Act and the rules and regulations of the
     Commission under the 1939 Act (the "1939 ACT REGULATIONS"), and will not
     contain an untrue statement of a material fact or omit to state a material
     fact required to be stated therein or necessary to make the statements
     therein not misleading.  The Prospectus, at the Representation Date (unless
     the term "Prospectus" refers to a prospectus which has been provided to the
     Underwriter by the Company for use in connection with the offering of the
     Securities which differs from the Prospectus on file at the Commission at
     the time the Registration Statement becomes effective, in which case at the
     time it is first provided to the Underwriter for such use) and at the
     Closing Time referred to in Section 2(c) hereof, and will not include an
     untrue statement of a material fact or omit to state a material fact
     necessary in order to make the statements therein, in the light of the
     circumstances under which they were made, not misleading; PROVIDED,
     HOWEVER, that the representations and warranties in this subsection shall
     not apply to statements in or omissions from the Registration Statement or
     Prospectus made in reliance upon and in conformity with information
     furnished to the Company in writing by the Underwriter expressly for use in
     the Registration Statement or the Prospectus. 

          (ii)      INCORPORATED DOCUMENTS.  The documents incorporated or
     deemed to be incorporated by reference in the Registration Statement and
     the Prospectus, at the time they were filed with the Commission, complied
     or at the time they hereafter are filed with the Commission will comply in
     all material respects with the requirements of the 1934 Act and the rules
     and regulations of the Commission thereunder (the "1934 ACT REGULATIONS"),
     and, when read together with the other information in the Prospectus, at
     the time the Registration Statement and any amendments thereto became or
     become effective, and at the Closing Time, did not and will not contain an
     untrue statement of a material fact or


                                          4

<PAGE>

     omit to state a material fact required to be stated therein or necessary to
     make the statements therein in light of the circumstances under which they
     were made, not misleading.

          (iii)     INDEPENDENT ACCOUNTANTS.  The accountants who certified the
     financial statements and supporting schedules included in the Registration
     Statement are independent public accountants as required by the 1933 Act
     and the 1933 Act Regulations.

          (iv)      FINANCIAL STATEMENTS.  The financial statements included in
     the Registration Statement and the Prospectus, together with the related
     schedules and notes, present fairly the financial position of the Company
     and its consolidated subsidiaries at the dates indicated and the statement
     of operations, stockholders' equity and cash flows of the Company and its
     consolidated subsidiaries for the periods specified; except as otherwise
     stated in the Registration Statement, said financial statements have been
     prepared in conformity with generally accepted accounting principles
     ("GAAP") applied on a consistent basis throughout the periods involved. 
     The supporting schedules, if any, included, in the Registration Statement
     present fairly in accordance with GAAP the information required to be
     stated therein.  The selected consolidated financial data included in the
     Prospectus present fairly the information shown therein and have been
     compiled on a basis consistent with that of the audited financial
     statements included in the Registration Statement.  The Company's ratios of
     earnings to fixed charges included in the Prospectus under the caption
     "Summary Consolidated Financial Data" and in Exhibit 12.1 to the 
     Registration Statement have been calculated in compliance with Item 
     503(d) of Regulation S-K of the Commission.

          (v)       NO MATERIAL ADVERSE CHANGE IN BUSINESS.  Since the
     respective dates as of which information is given in the Registration
     Statement and the Prospectus, except as otherwise stated therein, (A) there
     has been no material adverse change in the condition, financial or
     otherwise, or in the earnings or business affairs of the


                                          5

<PAGE>

     Company and its subsidiaries considered as one enterprise, whether or not
     arising in the ordinary course of business (a "MATERIAL ADVERSE EFFECT"), 
     (B) there have been no transactions entered into by the Company or any of
     its subsidiaries, other than those in the ordinary course of business,
     which are material with respect to the Company and its subsidiaries
     considered as one enterprise, and (C) there has been no dividend or
     distribution of any kind declared, paid or made by the Company on any class
     of its capital stock.

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

          (vii)     GOOD STANDING OF SUBSIDIARIES.  Each subsidiary of the
     Company has been duly organized and is validly existing as a corporation in
     good standing under the laws of the jurisdiction of its incorporation, has
     corporate power and authority to own, lease and operate its properties and
     to conduct its business as described in the prospectus and is duly
     qualified as a foreign corporation to transact business and is in good
     standing in each jurisdiction in which such qualification is required,
     whether by reason of the ownership or leasing of property or the conduct of
     business, except where the failure to so qualify or to be in good standing
     would not result in a Material Adverse Effect; except as otherwise
     disclosed in the Registration Statement, all of the issued and outstanding
     capital stock of each such corporate subsidiary has been duly authorized
     and validly issued, is fully paid and non-


                                          6

<PAGE>

     assessable and is owned by the Company, directly or through subsidiaries,
     free and clear of any security interest, mortgage, pledge, lien,
     encumbrance, claim or equity.

          (viii)    CAPITALIZATION.  The authorized, issued and outstanding
     capital stock of the Company is as set forth in the Prospectus under
     "Capitalization" (except for subsequent issuances, if any, pursuant to
     warrants, options, convertible securities or employee benefit plans).  
     The shares of issued and outstanding capital stock of the Company have 
     been duly authorized and validly issued and are fully paid and 
     nonassessable; the Common Stock conforms to the statements relating 
     thereto contained in the Prospectus; none of the outstanding shares of 
     capital stock of the Company was issued in violation of the preemptive 
     or other similar rights of any securityholder of the Company.

          (ix)      ABSENCE OF DEFAULTS AND CONFLICTS.  Neither the Company nor
     any of its subsidiaries is in violation of its Certificate of Incorporation
     or By-laws or other corresponding organizational documents or in default
     in the performance or observance of any obligation, agreement, covenant 
     or condition contained in any material contract, indenture, mortgage, 
     loan agreement, note, lease or other instrument to which the Company or 
     any of its subsidiaries is a party or by which it or any of them may be 
     bound, or to which any of the property or assets of the Company or any 
     subsidiary is subject (collectively, "AGREEMENTS AND INSTRUMENTS") except
     for such defaults that would not result in a Material Adverse Effect; and
     the execution, delivery and performance of this Agreement, the Pricing 
     Agreement, the Indenture and the Securities and the consummation of the 
     transactions contemplated herein and therein and in the Registration 
     Statement, and compliance by the Company with its obligations hereunder 
     and thereunder and the Securities have been duly authorized by all 
     necessary corporate action and do not and will not, whether with or 
     without the giving of notice or passage of time or both, conflict with 
     or constitute a breach of, or default under, or result in the creation 
     or imposition of any lien, charge or encumbrance upon any property or 
     assets of the Company or any subsidiary pursuant to, the Agreements and 
     Instruments (except


                                          7

<PAGE>

     for such conflicts, breaches or defaults or liens, charges or encumbrances
     that would not result in a Material Adverse Effect), nor will such action
     (i) entitle the holders of any Senior Indebtedness (as such term is defined
     in the Indenture) to accelerate the maturity thereof, or (ii) result in any
     violation of the provisions of the Certificate of Incorporation, By-laws or
     other corresponding organizational documents of the Company or any
     subsidiary or any applicable law, administrative regulation or
     administrative or court decree.

          (x)       ABSENCE OF LABOR DISPUTE.  No labor dispute with the
     employees of the Company or any subsidiary exists or, to the knowledge of
     the Company, is imminent, and the Company is not aware (without independent
     investigation) of any existing or imminent labor disturbance by the
     employees of any of its or any subsidiary's principal suppliers,
     manufacturers, customers or contractors, which, in either case, may
     reasonably be expected to result in a Material Adverse Effect.

          (xi)      ABSENCE OF PROCEEDINGS.   There is no action, suit,
     proceeding, inquiry or investigation before or brought by any court or
     governmental agency or body, domestic or foreign, now pending, or, to the
     knowledge of the Company, threatened, against or affecting the Company or
     any subsidiary, which is required to be disclosed in the Registration
     Statement (other than as disclosed therein), or which might reasonably be
     expected to result in a Material Adverse Effect other than as disclosed in
     the Registration Statement, or which might reasonably be expected to
     materially and adversely affect the properties or assets thereof or which
     might materially and adversely affect the consummation of the transactions
     contemplated in this Agreement; all pending legal or governmental
     proceedings to which the Company or any of its subsidiaries is a party or
     of which any of their respective property or assets is the subject which
     are not described in the Registration Statement (other than applications
     for product approvals before the United States Food and Drug Administration
     and health regulatory authorities in foreign countries and applications for
     patents or trademarks before the United States


                                          8

<PAGE>

     Patent and Trademark Office and similar authorities in foreign countries),
     including ordinary routine litigation incidental to the business, are,
     considered in the aggregate, not material; and there are not contracts or
     documents of the Company or any of its subsidiaries which are required to
     be filed as exhibits to the Registration Statement by the 1933 Act or by
     the 1933 Act Regulations which have not been so filed.

          (xii)     POSSESSION OF INTELLECTUAL PROPERTY.  Except as disclosed in
     the Prospectus, each of the Company and its subsidiaries owns or possesses
     patents, licenses, trademarks, service marks and trade names necessary to
     carry on its business as presently conducted and neither the Company nor
     any of its subsidiaries has received any notice of any infringement of or 
     conflict with asserted rights of others with respect to any of the 
     foregoing which, singly or in the aggregate, would result in a Material 
     Adverse Effect.

          (xiii)    ABSENCE OF FURTHER REQUIREMENTS.  No authorization, approval
     or consent of, any court or governmental authority or agency is necessary
     in connection with the offering, issuance or sale of the Securities
     hereunder or the consummation by the Company of any of the other
     transactions contemplated hereby except such as have been obtained to the
     extent required as of the date hereof and will have been obtained prior the
     Closing Time.

          (xiv)     AUTHORIZATION OF THE SECURITIES.  The Securities have been
     duly authorized by all necessary corporate action on the part of the 
     Company, and, at the Closing Time, will have been duly executed, by
     the Company, and, when authenticated in the manner provided for in the
     Indenture and delivered against payment of the purchase price therefor
     specified herein and in the Pricing Agreement, will constitute valid and
     binding obligations of the Company, subject as to enforcement (i) to
     bankruptcy, insolvency, reorganization, arrangement, moratorium, fraudulent
     conveyance and other laws of general applicability relating to or affecting
     creditors' rights and (ii) to general principles of equity whether such
     enforcement is considered in a proceeding in equity or at law.


                                          9

<PAGE>

          (xv)      AUTHORIZATION OF COMMON STOCK.  The shares of Common Stock
     issuable upon conversion of the Securities at the initial Conversion Price
     (as defined in the Indenture) have been duly authorized and validly 
     reserved for issuance upon such conversion, as the case may be, and such 
     shares, when issued and delivered upon such conversion or purchase in the 
     manner provided for in the Indenture, will be validly issued, fully paid 
     and nonassessable; and the issuance of such shares upon such conversion 
     will not be subject to preemptive or other similar rights.

          (xvi)     DESCRIPTION OF THE SECURITIES.  The Securities and the
     Common Stock conform in all material respects to the respective statements
     relating thereto contained in the Prospectus.

          (xvii)    AUTHORIZATION OF INDENTURE.  The Indenture has been duly 
     authorized by all necessary corporate action on the part of the Company 
     and, when executed and delivered by the Company (assuming the due 
     authorization, execution and delivery thereof by the Trustee), will 
     constitute a valid and binding agreement of the Company, enforceable 
     against the Company in accordance with its terms, subject as to enforcement
     (i) to bankruptcy, insolvency, reorganization, arrangement, moratorium, 
     fraudulent conveyance and other laws of general applicability relating to 
     or affecting creditors' rights and (ii) to general principles of equity, 
     whether such enforcement is considered in a proceeding at equity or at law.
     The Indenture conforms in all material respects to the description thereof 
     contained in the Prospectus.

          (xviii)   TITLE TO PROPERTY.  The Company and its subsidiaries have
     good and marketable title to their respective material properties, in each
     case free and clear of all liens, encumbrances and defects, except (A)
     customary liens and encumbrances arising in the ordinary course of the
     Company's business, (B) as stated in the Prospectus or (C) such as do not
     materially affect the value of such properties in the aggregate to the
     Company and its


                                          10
      
<PAGE>


    subsidiaries considered as one enterprise and do not materially interfere
    with the use made and proposed to be made of such properties.

            (xix)  POSSESSION OF LICENSES AND PERMITS.  The Company and its
    subsidiaries possess such material certificates, authorities or permits
    issued by the appropriate state, federal or foreign regulatory agencies or
    bodies necessary to conduct the business now operated by them, and neither
    the Company nor any of its subsidiaries has received any notice of
    proceedings relating to the revocation or modification of any such
    certificate, authority or permit which, singly or in the aggregate, if the
    subject of an unfavorable decision, ruling or finding, would materially and
    adversely affect the condition, financial or otherwise, or the earnings or
    business affairs of the Company and its subsidiaries considered as one
    enterprise.

            (xx)   NO CHANGE IN CONTROL.  To the knowledge of the Company, no
    event has occurred nor is any action threatened or pending which would
    result in a Change in Control (as defined in the Indenture).

            (xxi)  NO PENDING DISTRIBUTION.  Except as contemplated by this
    Agreement, no distribution by the Company or any of its affiliates, and no
    distribution that could be attributed to the Company (as the result of
    distributions by an "affiliated purchaser" within the meaning of Rule 10b-6
    under the 1934 Act or otherwise), of Securities or shares of Common Stock
    (collectively, the "SUBJECT SECURITIES"), any securities of the same class
    and/or series as the Subject Securities, or any securities immediately
    convertible into or exchangeable for any right to acquire any Subject
    Security is now in progress or pending or will have commenced at any time
    prior to the completion of the distribution of the Securities, except for
    distributions (i) pursuant to employee benefit plans and dividend
    reinvestment plans, (ii) upon exercise of currently outstanding warrants,
    options or convertible securities or (iii) made as gifts by officers or 
    directors of the Company.

            (xxii) AUTHORIZATION OF AGREEMENT.  This Agreement has been, and,
    at the Representation Date,


                                          11

<PAGE>

    the Pricing Agreement will have been, duly executed and delivered by the
    Company.

    (b)  OFFICER'S CERTIFICATES.  Any certificate designated as such signed by
any officer of the Company or any of its subsidiaries delivered to the
Underwriter or to counsel for the Underwriter shall be deemed a representation
and warranty by the Company to the Underwriter as to the matters covered
thereby.

    SECTION 2.  SALE AND DELIVERY TO UNDERWRITER; CLOSING.

    (a)  SECURITIES.  On the basis of the representations and warranties herein
contained and subject to the terms and conditions herein set forth, the Company
agrees to sell to the Underwriter, and the Underwriter agrees to pur
chase from the Company, the Initial Securities at the price per $1,000 principal
amount set forth in the Pricing Agreement.

            (1)  If the Company has elected not to rely upon Rule 430A under
the 1933 Act Regulations, the initial public offering price, the initial
conversion price, the interest rate of the Securities, and the purchase price
(per $1,000 principal amount) to be paid by the Underwriter for the Securities
have each been determined and set forth in the Pricing Agreement, dated the date
hereof, and an amendment to the Registration Statement and the Prospectus will
be filed before the Registration Statement becomes effective.

            (2)  If the Company has elected to rely upon Rule 430A under the
1933 Act Regulations, the purchase price (per $1,000 principal amount) to be
paid by the Underwriter for the Securities shall be an amount equal to the
initial public offering price, less an amount per Security to be determined by
agreement between the Under-


                                          12

<PAGE>

writer and the Company.  The initial public offering price (per $1,000 principal
amount) of the Securities shall be $1,000.  The initial Conversion Price
applicable to the Securities and the interest rate of the Securities
shall be determined by agreement between the Company and the Underwriter.  The
initial public offering price, initial Conversion Price, the purchase price and
interest rate, when so determined, shall be set forth in the Pricing Agreement.
In the event that such interest rate and Conversion Price have not been
agreed upon and the Pricing Agreement has not been executed and delivered by the
parties thereto by the close of business on the fourth business day following
the date of this Agreement, this Agreement shall terminate forthwith, without
liability of any party to any other party, unless otherwise agreed to by the
Company and the Underwriter.

    (b)  In addition, on the basis of the representations and warranties herein
contained and subject to the terms and conditions herein set forth, the Company
hereby grants an option to the Underwriter to purchase from it any or all of the
Option Securities (in multiples of $1,000 principal amount) at the same price
(per $1,000 principal amount) as is to be paid by the Underwriter for the
Initial Securities on the terms set forth in the Pricing Agreement.  The option
hereby granted will expire automatically 30 days after (i) the date the
Registration Statement becomes effective, if the Company has elected not to rely
upon Rule 430A under the 1933 Act Regulations or (ii) the Representation Date,
if the company has elected to rely upon Rule 430A under the 1933 Act
Regulations, and may be exercised in whole or in part (but only once) only for
the purpose of covering over-allotments which may be made in connection with the
offering and distribution of the Initial Securities upon notice by the
Underwriter to the Company at least three business days prior to the Date of
Delivery (as defined below), or at least two business days prior to the delivery
of the Initial Securities, setting forth the number of Option Securities as to
which the Underwriter is then exercising the option and the time and date of
payment and delivery for such Option Securities.  Any such time and date of
delivery (a "DATE OF DELIVERY") shall be determined by the Underwriter but shall
not be later than seven full business days after the exercise of such


                                          13

<PAGE>

option, and not in any event prior to the Closing Time, as hereinafter defined,
unless otherwise agreed by the Underwriter and the Company.

    (c)  Delivery of the Initial Securities shall be made at the office of the
Underwriter in New York City, and payment of the purchase price for the Initial
Securities shall be made at the offices of Heller, Ehrman, White & McAuliffe,
525 University Avenue, Suite 1100, Palo Alto, California, or in each case at
such other place as shall be agreed upon by the Underwriter and the Company, at
7:00 A.M., (Palo Alto time) on the third business day following the date the
Registration Statement becomes effective (or, if the Company has elected to rely
upon Rule 430A, the third business day after execution of the Pricing
Agreement), or such other time not later than ten business days after such date
as shall be agreed upon by the Underwriter and the Company (such time and date
of payment and delivery being herein called the "CLOSING TIME").  In addition,
in the event that any or all of the Option Securities are purchased by the
Underwriter, payment of the purchase price for, and delivery of certificates
for, such Option Securities shall be made at the above-mentioned offices of
Heller Ehrman White & McAuliffe and the Underwriter, respectively, or at such
other place as shall be agreed upon by the Underwriter and the Company, on the
Date of Delivery as specified in the notice from the Underwriter to the Company.
Payment shall be made to the Company by federal funds wire transfer of same day
funds to an account designated by and against delivery to the Underwriter of
certificates for the Securities to be purchased by it.  Certificates evidencing
the Initial Securities and the Option Securities, if any, shall be registered in
such names and in such denominations as the Underwriter may request in writing
at least two business days before the Closing Time or the Date of Delivery, as
the case may be.  The certificates for the Initial Securities or the Option
Securities, if any, will be made available for examination and packaging by the
Underwriter not later than 10:00 A.M. (New York City time), on the last business
day prior to the Closing Time or the Date of Delivery, as the case may be.

    SECTION 3.  COVENANTS OF THE COMPANY.  The Company covenants with the
Underwriter as follows:


                                          14

<PAGE>

    (a)     COMPLIANCE WITH SECURITIES REGULATIONS AND COMMISSION REQUESTS.
The Company will notify the Underwriter immediately, and confirm the notice in
writing, (i) of the effectiveness of the Registration Statement and any
amendment thereto (including any post-effective amendment) and, if Rule 430A of
the 1933 Act Regulations is being relied upon, of the filing of the amended
Prospectus pursuant to Rule 430A and Rule 424(b)(1), (ii) of the receipt of any
comments from the Commission, (iii) of any request by the Commission for any
amendment to the Registration Statement or any amendment or supplement to the
Prospectus or for additional information, and (iv) of the issuance by the
Commission of any stop order suspending the effectiveness of the Registration
Statement or of any order preventing or suspending the use of any preliminary
prospectus, or of the suspension of the qualification of the Securities for
offering or sale in any jurisdiction, or of the initiation or threatening of any
proceedings for any of such purposes.  The Company will make every reasonable
effort to prevent the issuance of any stop order and, if any stop order is
issued, to obtain the lifting thereof at the earliest possible moment.

    (b)     FILING OF AMENDMENTS.  The Company will not at any time file or
make any amendment to the Registration Statement (including any post-effective
amendment) or any amendment or supplement to the Prospectus (including any
revised prospectus which the Company proposes for use by the Underwriter in
connection with the offering of the Securities which differs from the prospectus
on file at the Commission at the time the Registration Statement becomes
effective, whether or not such revised prospectus is required to be filed
pursuant to Rule 424(b) of the 1933 Act Regulations), whether pursuant to the
1933 Act, the 1934 Act or otherwise, of which the Underwriter shall not have
previously been advised and furnished a copy a reasonable amount of time prior
to its proposed filing, or to which the Underwriter or counsel for the
Underwriter shall reasonably object.

    (c)     DELIVERY OF REGISTRATION STATEMENTS.  The Company will deliver to
the Underwriter two signed copies of the Registration Statement as originally
filed and of each amendment thereto (including exhibits filed therewith or
incorporated by reference therein and documents incorporated or deemed to be
incorporated by reference


                                          15

<PAGE>

therein) [and signed copies of all consents and certificates of experts, as the
Underwriter may reasonably request] and will also deliver to the Underwriter as
many conformed copies of the Registration Statement as originally filed and of
each amendment thereto (without exhibits) as the Underwriter may reasonably
request.

    (d)     DELIVERY OF PROSPECTUS.  The Company will furnish to the
Underwriter, from time to time during the period when the Prospectus is required
to be delivered under the 1933 Act or the 1934 Act, such number of copies of the
Prospectus (as amended or supplemented) as such Underwriter may reasonably
request for purposes contemplated by the 1933 Act or the 1934 Act or the
respective applicable rules and regulations of the Commission thereunder.

    (e)     CONTINUED COMPLIANCE WITH SECURITIES LAWS.  The Company will comply
with the 1933 Act and the 1933 Act Regulations, the 1934 Act and the 1934 Act
Regulations and the 1939 Act and the 1939 Act Regulations so as to permit the
completion of the distribution of the Securities as contemplated in this
Agreement and in the Prospectus.  If any event shall occur or condition shall
exist as a result of which it is necessary, in the opinion of counsel for the
Underwriter or counsel for the Company, to amend the Registration Statement or
amend or supplement the Prospectus in order that the Prospectus will not include
any untrue statement of any material fact or omit to state a material fact
necessary in order to make the statements therein not misleading in the light of
the circumstances existing at the time it is delivered to a purchaser, or if it
shall be necessary, in the opinion of such counsel, at any such time to amend
the Registration Statement or amend or supplement the Prospectus in order to
comply with the requirements of the 1933 Act or the 1933 Act Regulations, the
Company will promptly prepare and file with the Commission, subject to Section
3(b) hereof such amendment or supplement as may be necessary to correct such
untrue statement or omission or to make the Registration Statement or the
Prospectus comply with such requirements, and the Company will furnish to the
Underwriter such number of copies of such amendment or supplement as the
Underwriter may reasonably request.  The Company agrees to notify the
Underwriter to suspend use of the Prospectus as promptly as practicable after
the occurrence of such an event or


                                          16

<PAGE>

the existence of such a condition, and the Underwriter hereby agrees to suspend
use of the Prospectus until the Company has amended or supplemented the
Prospectus to correct such misstatement or omission.

    (f)     BLUE SKY QUALIFICATIONS.  The Company will use its best efforts in
cooperation with the Underwriter, to qualify the Securities and the shares of
Common Stock issuable upon conversion of the Securities for offering and sale
under the applicable securities, laws of such states and other jurisdictions of
the United States as the Underwriter may designate PROVIDED, HOWEVER, that the
Company shall not be obligated to file any general consent to service or process
or to qualify as a foreign corporation or as a dealer in securities in any
jurisdiction in which it is not so qualified.  In each jurisdiction in which the
Securities or such shares of Common Stock have been so qualified, the Company
will file such statements and reports as may be required by the laws of such
jurisdiction to continue such qualification in effect for so long as may be
required by the laws of such jurisdiction in connection with the distribution of
the Securities or such shares of Common Stock.  The Company will also supply the
Underwriter with such information as is reasonably necessary for the
determination of the legality of the Securities for investment under the laws of
such jurisdictions as the Underwriter may request.

    (g)     RULE 158.  The Company will make generally available to holders of
its securities as soon as practicable, but not later than 90 days after the
close of the period covered thereby, an earnings statement (in form complying
with the provisions of Rule 158 of the 1933 Act Regulations) covering a twelve
month period beginning not later than the first day of the Company's fiscal
quarter next following the "effective date" (as defined in said Rule 158) of the
Registration Statement.

    (h)     USE OF PROCEEDS.  The Company will use the net proceeds received by
it from the sale of the Securities in the manner specified in the Prospectus
under "Use of Proceeds."

    (i)     FILING PURSUANT TO RULE 430A.  If, at any time that the
Registration Statement becomes effective, any information shall have been
omitted therefrom in reliance upon Rule 430A of the 1933 Act Regulations, then
immedi-


                                          17

<PAGE>

ately following the execution of the Pricing Agreement, the Company will
prepare, and file or transmit for filing with the Commission in accordance with
such Rule 430A and Rule 424(b) of the 1933 Act Regulations, copies of an amended
Prospectus, or, if required by such Rule 430A, a post-effective amendment to the
Registration Statement (including an amended Prospectus), containing all
information so omitted.

    (j)     REPORTING REQUIREMENTS.  The Company, during the period when the
Prospectus is required to be delivered under the 1933 Act or the 1934 Act, will
file all documents required to be filed with the Commission pursuant to Section
13, 14 or 15 of the 1934 Act within the time periods required by the 1934 Act
and the 1934 Act Regulations of which the Underwriter shall have previously been
advised and furnished a copy, and to which the Underwriter or its counsel shall
not have reasonably objected.

    (k)     REPORTS TO STOCKHOLDERS.  For a period of five years after the
Closing Time, the Company will furnish to the Underwriter copies of all reports
and communications delivered to the Company's stockholders to the holders of the
Securities as a class and will also furnish copies of all reports (excluding
exhibits) filed with the Commission on forms 8-K, 10-Q and 10-K, and all other
reports and information furnished to its stockholders generally, not later than
the time such reports are first furnished to its stockholders generally.

    (l)     LISTING.  The Company will use its best efforts to effect the
listing of the Securities and the shares of Common Stock issuable upon
conversion of the Securities on the New York Stock Exchange (the
"NYSE")(and, in the case of such shares of the Common Stock, any other stock
exchange on which the Common Stock is listed) and to cause the Securities to be
registered under the 1934 Act.

    (m)     SUFFICIENT SHARES OF COMMON STOCK.  The Company will reserve and
keep available at all times, free of preemptive rights, sufficient shares of
Common Stock for issuance upon conversion of all the Securities.

    (n)     COMPLIANCE WITH FLORIDA STATUTE.  The Company has complied and will
comply with all the provisions of

                                          18


<PAGE>

Florida H.B. 1771, codified as Section 517.075 of the Florida statutes, and all
regulations promulgated thereunder relating to issuers doing business in Cuba.

    (o)     RESTRICTION ON SALE OF SECURITIES.  During a period of 90 days from
the date of the Pricing Agreement, the Company will not, without the
Underwriter's prior written consent, directly or indirectly, sell, offer to
sell, grant any option for the sale of, or otherwise dispose of or transfer, any
securities similar to the Securities or any Common Stock or any security
convertible into or exchangeable or exercisable for any Securities or any such
similar securities or Common Stock except for securities (i) sold to the
Underwriter pursuant to this Agreement, (ii) issued or sold pursuant to employee
benefit plans and dividend reinvestment plans, (iii) issued upon exercise of
currently outstanding warrants, options, or convertible securities, or (iv) 
issued or sold in a transaction exempt from the registration requirements of 
the 1933 Act; PROVIDED, HOWEVER, that in the case of clause (iv), such 
securities may not (A) exceed, or be convertible into or exchangeable or 
exercisable for more than, fifteen percent (15%) of the fully diluted equity 
interest in the company and (B) be eligible for the PORTAL trading system of 
the National Association of Securities Dealers, Inc.  The foregoing sentence 
shall not apply to shares of Common Stock issued in connection with investments
in, acquisitions of, or mergers or combinations with other companies by the 
Company.

    SECTION 4.  PAYMENT OF EXPENSES.  (a) EXPENSES.  The Company will pay all
expenses incident to the performance of its obligations under this Agreement,
including (i) the printing and filing of the Registration Statement as
originally filed and of each amendment thereto, (ii) the printing and
reproduction of this Agreement and the Indenture (iii) the preparation, issuance
and delivery of the certificates for the Securities to the Underwriter, (iv) the
fees and disbursements of the Company's counsel and accountants (v) the
qualification of the Securities and the shares of Common Stock issuable upon
conversion of the Securities under state securities laws in accordance with 
the provisions of Section 3(f) hereof, including filing fees and
the reasonable fees and disbursements of counsel for the Underwriter in
connection therewith and in connection with the preparation of the


                                          19

<PAGE>

Blue Sky Survey and any Legal Investment Survey and any supplement or amendment
thereto, (vi) the printing and delivery to the Underwriter of copies of the
Registration Statement as originally filed and each amendment thereto, of each
preliminary prospectus, and of the Prospectus and any amendments or supplements
thereto, (vii) the printing and delivery to the Underwriter of copies of the
Blue Sky Survey and any Legal Investment Survey and any supplement or amendment
thereto, (viii) the fees and expenses of the Trustee, including the fees and
disbursements of counsel for the Trustee in connection with the Indenture, (ix)
any fees payable in connection with the rating of the Securities, and (x) the
fee of the National Association of Securities Dealers, Inc. in connection with
its review of corporate financings with respect to the Securities and fees and
disbursements of counsel to the Underwriter in connection therewith; and (xi)
the fees and expenses incurred in connection with the listing on the NYSE of the
Securities and shares of Common Stock issuable upon conversion of the 
Securities (and, in the case of such shares of Common Stock, the fees and
expenses incurred in connection with the listing of such shares of Common Stock
on each other stock exchange on which the Common Stock is listed).

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

    SECTION 5.  CONDITIONS OF UNDERWRITER'S OBLIGATIONS.  The obligations of
the Underwriter hereunder are subject to the accuracy of the representations and
warranties of the Company herein contained or in certificates of any officer of
the Company or any subsidiary delivered pursuant to the provisions hereof, to
the performance by the Company of its covenants and other obligations hereunder,
and to the following further conditions:

    (a)     EFFECTIVENESS OF REGISTRATION STATEMENT.  The Registration Statement
shall have become effective not later than 5:30 P.M. on the date hereof, or at 
such later time and date as may be approved by the Underwriter; and at the 
Closing Time no stop order suspending the effectiveness of the Registration 
Statement shall have been


                                          20

<PAGE>


issued under the 1933 Act or proceedings therefor initiated or threatened by the
Commission.  If the Company has elected to rely upon Rule 430A of the 1933 Act
Regulations, the initial public offering price, the interest rate for the
Securities and initial Conversion Price of the Securities and any other 
price-related information previously omitted from the effective Registration 
Statement pursuant to such Rule 430A shall have been transmitted to the 
Commission for filing pursuant to Rule 424(b) of the 1933 Act Regulations 
within the prescribed time period, and prior to the Closing Time the Company 
shall have provided evidence satisfactory to the counsel for the Underwriter 
of such timely filing, or a post-effective amendment providing such information 
shall have been promptly filed and declared effective in accordance with the 
requirements of Rule 430A of the 1933 Act Regulations.

    (b)  CLOSING CONDITIONS.  At the Closing Time the Underwriter shall have
received:

         (1)  A signed opinion of Heller Ehrman White & McAuliffe, counsel to
the Company, dated as of the Closing Time, in form and substance satisfactory to
counsel for the Underwriter, to the effect that:

         (i)  The Company has been duly incorporated and is validly existing
    and in good standing under the laws of the State of Delaware.

         (ii)  The Company has all requisite corporate power and corporate
    authority to enter into and perform this Agreement, the Pricing Agreement
    and the Indenture, to own, lease and operate its properties and to carry on
    its business as, to the knowledge of such counsel, it is now conducted.

         (iii)  The Company is duly qualified to do business and is in good
    standing in the State of California.

         (iv)  The Indenture has been duly authorized by all necessary
    corporate action on the part of the Company and has been duly executed and
    delivered on behalf of the Company.


                                          21

<PAGE>

         (v)  Assuming the due authorization, execution and delivery thereof by
    the Trustee, the Indenture is a valid and binding obligation of the Company
    enforceable against the Company in accordance with its terms, subject as to
    enforcement (i) to bankruptcy, insolvency, reorganization, arrangement,
    moratorium, fraudulent conveyance and other laws of general applicability
    relating to or affecting creditors' rights and (ii) to general principles
    of equity, whether such enforcement is considered in a proceeding in equity
    or at law.

         (vi)  The form of certificate representing the Securities is in the
    form contemplated by the Indenture; the Securities have been duly
    authorized by all necessary corporate action on the part of the Company
    and, when executed by the Company and authenticated by or on behalf of the
    Trustee in the manner provided for in the Indenture (assuming the due
    authorization, execution and delivery of the Indenture by the Trustee) and
    delivered against payment of the purchase price therefor specified herein
    and in the Pricing Agreement, will constitute valid and binding obligations
    of the Company, enforceable against the Company in accordance with their
    terms, subject as to enforcement (i) to bankruptcy, insolvency,
    reorganization, arrangement, moratorium, fraudulent conveyance and other
    laws of general applicability relating to or affecting creditors' rights
    and (ii) to general principles of equity, whether such enforcement is
    considered in a proceeding in equity or at law and, except as set forth
    above, will be entitled to the benefits of the Indenture; and the issuance
    of the Securities is not subject to any preemptive rights or other rights
    of first refusal arising by operation of law or under the Certificate of
    Incorporation or Bylaws of the Company.

         (vii)  The shares of Common Stock issuable upon conversion of the
    Securities at the initial Conversion Price have been duly authorized and
    validly reserved by the Company for issuance upon such conversion and, when
    issued and delivered upon such conversion in the manner provided in the
    Indenture, will be validly issued, fully paid and nonassessable; and the
    issuance of such shares upon such


                                          22

<PAGE>

    conversion is not presently subject to any preemptive rights or other
    rights of first refusal arising by operations of law or under the
    Certificate of Incorporation or Bylaws of the Company.

         (viii)  The Indenture has been qualified under the 1939 Act.

         (ix)  This Agreement and the Pricing Agreement have been duly
    authorized by all necessary corporate action on the part of the Company and
    have been duly executed and delivered on behalf of the Company.

         (x)  The Securities, the Common Stock and the Indenture conform in all
    material respects to the descriptions thereof contained in the Prospectus.

         (xi)  The form of certificate used to evidence the Common Stock is in
    due and proper form and complies with applicable provisions of the Delaware
    General Corporation law.

         (xii)  The Registration Statement is effective under the 1933 Act and,
    to such counsel's knowledge, no stop order suspending the effectiveness of
    the Registration Statement has been issued under the 1933 Act or
    proceedings therefor initiated or threatened by the Commission.

         (xiii)  At the time the Registration Statement became effective and at
    the Representation Date, the Registration Statement (other than the
    financial statements and supporting schedules included herein, as to which
    no opinion need be rendered) complied as to form in all material respects
    with the requirements of the 1933 Act and the 1933 Act Regulations.

         (xiv)  The information in the Prospectus under the captions
    "Description of Debentures" and "Certain United States Federal Income Tax
    Considerations," to the extent that it constitutes matters of law,
    summaries of legal matters, documents or proceedings, or legal conclusion,
    has been reviewed by such counsel and is correct in all material respects.

         (xv)  No government consents, approvals, authorizations,
    registrations, declarations or filings,


                                          23

<PAGE>

    or order of any court of which such counsel has knowledge, are required in
    connection with the offering, issuance or sale of the Securities to the
    Underwriter, except such as may be required under the 1933 Act, the 1933
    Act Regulations, the 1934 Act, the 1934 Act Regulations, the 1939 Act, the
    1939 Act Regulations or state securities laws for the offering and sale of
    the Securities and the qualification of the Indenture under the 1939 Act.

         (xvi)  Neither the execution or delivery of this Agreement, the
    Pricing Agreement or the Indenture by the Company nor the performance of
    this Agreement, the Pricing Agreement or the Indenture by the Company (A)
    conflicts with any provision of the Certificate of Incorporation or Bylaws
    of the Company or (B) violates any law applicable to the Company.

         (xvii)  Neither the issuance and delivery of the Securities or the
    Common Stock issuable upon conversion of the Securities nor the repurchase 
    of the Securities by the Company (A) conflicts with any provision of the
    Certificate of Incorporation or Bylaws of the Company or (B) violates any
    law applicable to the Company.

    The opinion expressed in subsection (xv) of this Section 5(b)(1) shall not
be construed to relate to, and no opinion need be rendered as to, state 
laws or regulations applicable to health, drugs and cosmetics.  The
opinion expressed in subsections (xvi)(B) and (xvii)(B) shall not be construed
to relate to, and no opinion need be rendered as to, federal or state securities
laws, patent laws or regulations or federal or state laws or regulations
applicable to health, drugs or cosmetics.  In giving the opinion required by
subsection (b)(1) of this Section, Heller Ehrman White & McAuliffe shall
additionally state that nothing has come to their attention that would lead them
to believe (A) that the Registration Statement or any amendment thereto (other
than the financial statements and supporting schedules and other financial data
included therein, in the Registration Statement as to which no belief need be 
expressed), at  the time the Registration Statement or


                                          24

<PAGE>

any such amendment became effective, contained an untrue statement of a material
fact or omitted or omits to state a material fact required to be stated therein
or necessary in order to make the statements therein not misleading or that (B)
the Prospectus or any amendment or supplement thereto (other that the financial
statements and supporting schedules and other financial data included therein as
to which no belief need be expressed), at the Representation Date (unless the
term "Prospectus" refers to a prospectus which has been provided to the
Underwriter by the Company for use in connection with the offering of the
Securities which differs from the Prospectus on file at the Commission at the
time the Registration Statement becomes effective, in which case at the time it
is first provided to the Underwriter for such use) or at the Closing Time,
contained or contains an untrue statement of a material fact or omitted or omits
to state a material fact necessary in order to make the statements therein, in
the light of the circumstances under which they were made, not misleading.

         (2)  A signed opinion of Peter D. Staple, Esq., Vice President and
General Counsel of the Company, dated as of the Closing Time, in form and
substance satisfactory to counsel for the Underwriter, to the effect that:

         (i)  To the knowledge of such counsel, the Company is duly qualified
    as a foreign corporation to transact business and is in good standing in
    each jurisdiction in which such qualification is required, whether by
    reason of the ownership or leasing of property or the conduct of business,
    except where the failure to so qualify would not have a material adverse
    effect on the condition, financial or otherwise, or the earnings or
    business affairs of the Company and its subsidiaries considered as one
    enterprise.

         (ii)  The authorized, issued and outstanding capital stock of the
    Company is as set forth in the Prospectus under "Capitalization" (except
    for subsequent issuances, if any, pursuant to employee benefit plans and
    dividend reinvestment plans or issued upon exercise of currently
    outstanding warrants or options, in each case as the same may be referred
    to in the Prospectus), and the shares of issued and outstanding Common
    Stock have been duly authorized


                                          25

<PAGE>

    and validly issued and are fully paid and nonassessable.

         (iii)  Each subsidiary of the Company has been duly organized and is
    validly existing as a corporation in good standing under the laws of the
    jurisdiction of its incorporation, has corporate power and authority to
    own, lease and operate its properties and to conduct its business as
    described in the Prospectus and, to such counsel's knowledge, is duly
    qualified as a foreign corporation to transact business and is in good
    standing in each jurisdiction in which such qualification is required,
    whether by reason of the ownership or leasing of property or the conduct of
    business, except where the failure to so qualify would not have a material
    adverse effect on the condition, financial or otherwise, or the earnings or
    business affairs of the Company and its subsidiaries considered as one
    enterprise; all of the issued and outstanding capital stock of each such
    subsidiary has been duly authorized and validly issued, is fully paid and
    nonassessable and, to such counsel's knowledge, is owned by the Company,
    directly or through subsidiaries, free and clear of any security interest,
    mortgage, pledge, lien, encumbrance, claim or equity.

         (iv)  The information in the Company's Annual Report on Form 10-K
    filed with the Commission pursuant to the 1934 Act for the year ended
    December 31, 1995, under the caption "Item 3.  Legal Proceedings", to the
    extent that it constitutes matters of law, summaries of legal documents or
    proceedings, or legal conclusions, has been reviewed by such counsel and is
    correct in all material respects.

         (v)  To such counsel's knowledge, there are no contracts, indentures,
    mortgages, loan agreements, notes, leases or other instruments or documents
    required to be described or referred to in the Registration Statement or to
    be filed as exhibits thereto other than those described or referred to
    therein or filed or incorporated by reference as exhibits thereto; the
    descriptions thereof or references thereto are correct; and no default
    exists in the due performance or observance of any obligation, agreement,
    covenant or condition contained in any


                                          26

<PAGE>

    contract, indenture, mortgage, loan agreement, note, lease or other
    instrument so described, referred to, filed or incorporated by reference,
    which would result in any material adverse change in the condition,
    financial or otherwise, or in the earnings or business affairs of the
    Company.

         (vi)  The execution and delivery of this Agreement, the Pricing
    Agreement and Indenture on behalf of the Company, the performance of this
    Agreement, the Pricing Agreement and the Indenture on behalf of the
    Company, and the issuance and delivery of the Securities or the Common
    Stock issuable upon conversion thereof by the Company or the repurchase of
    the Securities under the Indenture by the Company do not and will not (A)
    conflict with any provision of the Certificate of Incorporation or Bylaws
    of the Company or any of its subsidiaries, (B) violate any law,
    administrative regulation or administrative or court decree applicable to
    the Company or any of its subsidiaries or (C) result in a breach or
    violation of or constitute a default under, or result in the creation or
    imposition of any lien, charge or encumbrance upon any property or assets
    of the Company or any of its subsidiaries pursuant to, any term of any
    material agreement or instrument to which the Company is a party or by
    which the Company is bound or to which any of the properties or assets of
    the Company are subject.

         (vii)  Each document filed pursuant to the 1934 Act and incorporated
    or deemed to be incorporated by reference in the Prospectus complied, when
    so filed, as to form in all material respects with the 1934 Act and the
    1934 Act Regulations.

         (viii)  Except as disclosed in the Prospectus, each United States
    patent and registered trademark referred to in the Prospectus as owned by
    the Company has been issued by the United States Patent and Trademark
    Office.

         (ix)  Except as disclosed in the Prospectus, such counsel does not
    know of any pending or threatened legal or governmental proceeding relating
    to patents or proprietary know-how used by the Company or others to which
    the Company is a party or to


                                          27

<PAGE>

    which any of the properties of the Company are the subject which, if
    adversely decided, could result in any material adverse change in the
    condition, financial or otherwise, or in the earnings or business affairs
    of the Company and its subsidiaries considered as one enterprise.

         (x)  Neither the issuance of the Securities nor the shares of Common
    Stock issuable upon conversion of the Securities are subject to any
    preemptive rights or other rights of first refusal arising by operation of
    law, under the Certificate of Incorporation or Bylaws of the Company or, to
    such counsel's knowledge, otherwise.

         (3)  The favorable opinion of Skadden, Arps, Slate, Meagher & Flom,
counsel for the Underwriter, dated as of Closing Time, with respect to such
matters as the Underwriter may reasonably require.

    (c)  At the Closing Time, there shall not have been, since the date hereof
or since the respective dates as of which information is given in the
Registration Statement and the Prospectus, any material adverse change in the
condition, financial or otherwise, or in the earnings or business affairs of the
Company and its subsidiaries considered as one enterprise, whether or not
arising in the ordinary course of business, and the Underwriter shall have
received a certificate of the President or a Vice President of the Company and
of the chief financial or chief accounting officer of the Company, dated as of
the Closing Time, to the effect that (i) there has been no such material adverse
change, (ii) the representations and warranties in Section 1 hereof are true and
correct with the same force and effect as though expressly made at and as of the
Closing Time, (iii) the Company has complied with all agreements and satisfied
all conditions on its part to be performed or satisfied at or prior to the
Closing Time, (iv) no stop order suspending the effectiveness of the
Registration Statement has been issued and no proceedings for that purpose have
been initiated or threatened by the Commission, and (v) to such officers'
knowledge, there are no contracts, inden-


                                          28

<PAGE>

tures, mortgages, loan agreements, notes, leases or other instruments required
to be described or referred to in the Registration Statement or to be filed as
exhibits thereto other than those described or referred to therein or filed or
incorporated by reference as exhibits thereto.

    (d)  At the time of the execution of this Agreement, the Underwriter shall
have received from Ernst & Young, LLP a letter dated the date that the
Registration Statement first became effective (the "First E & Y Letter"), in
form and substance satisfactory to the Underwriter.

    (e)  At the Closing Time, the Underwriter shall have received from Ernst &
Young, LLP a letter, dated as of the Closing Time, confirming, on the basis of a
review in accordance with the procedures set forth in the First E & Y Letter,
that nothing has come to their attention from the date of the most recent
financial statements of the Company filed with the Commission, audited or
interim, as the case may be, to a date not more that five days prior to the
Closing Time which would require any change in the First E & Y Letter if it were
required to be dated and delivered at the Closing Time, except in each case as
described in the second such letter.

    (f)  Subsequent to the execution of this Agreement, no downgrading shall
have occurred in the rating accorded any of the Company's debt securities by
Standard & Poor's Corporation or Moody's Investors Service, and neither such
organization shall have publicly announced that it has under surveillance or
review, with possible negative implications, its rating accorded any of the
Company's debt securities, if in the reasonable judgement of the Underwriter any
such development is so material and adverse as to make it impracticable or
inadvisable to consummate the sale and delivery of the Securities by the
Underwriter as contemplated in the Prospectus.

    (g)  At the Closing Time, the Securities and the Common Stock issuable upon
conversion thereof shall have been approved for listing on the NYSE upon notice
of issuance.

    (h)  At the Closing Time, and at the Date of Delivery, if any, counsel for
the Underwriter shall have been furnished with such documents and opinions as
they may


                                          29

<PAGE>

reasonably require for the purpose of enabling them to pass upon the issuance
and sale of the Securities as herein contemplated and related proceedings, or in
order to evidence the accuracy of any of the representations or warranties, or
the fulfillment of any of the conditions, herein contained; and all proceedings
taken by the Company in connection with the issuance and sale of the Securities
as herein contemplated shall be satisfactory in form and substance to the
Underwriter and counsel for the Underwriter.

    (i)  In the event that the Underwriter exercises its option provided in
Section 2(b) hereof to purchase all or any portion of the Option Securities and
the Date of Delivery is not the same as the Closing Time, the representations
and warranties of the Company contained herein and the statements in any
certificates furnished by the Company hereunder shall be true and correct as of
the Date of Delivery, and, at the Date of Delivery, the Underwriter shall have
received:

         (1)  A certificate, dated the Date of Delivery, of the President or a
Vice President of the Company and the chief financial or chief accounting
officer of the Company confirming that the certificate delivered at the Closing
Time pursuant to Section 5(c) hereof remains true and correct as of the Date of
Delivery.

         (2)  The favorable opinion of Heller Ehrman White & McAuliffe,
counsel to the Company, in form and substance satisfactory to counsel for the
Underwriter, dated the Date of Delivery, relating to the Option Securities to be
purchased on the Date of Delivery and otherwise to the same effect as the
opinion required by Section 5(b)(1) hereof.

         (3)  The favorable opinion of Peter D. Staple, Esq., Vice President
and General Counsel of the Company, in form and substance satisfactory to
counsel for the Underwriter, dated the Date of Delivery, and to the same effect
as the opinion required by Section 5(b)(2) hereof.

         (4)  The favorable opinion of Skadden, Arps, Slate, Meagher & Flom,
counsel for the Underwriter, dated the Date of Delivery, relating to the Option
Securities to be purchased on the Date of Delivery and otherwise to


                                          30

<PAGE>

the same effect as the opinion required by Section 5(b)(3) hereof.

          (5)  A letter from Ernst & Young, LLP, in form and substance
satisfactory to the Underwriter and dated the Date of Delivery, substantially
the same in form and substance as the letter furnished to the Underwriter
pursuant to Section 5(e) hereof, except that the "specified date" in the letter
furnished pursuant to this Section 5(i)(5) shall be a date not more than five
days prior to the Date of Delivery.

     If any of the conditions specified in this Section shall not have been
fulfilled when and as required to be fulfilled, this Agreement may be terminated
by the Underwriter by notice to the Company at any time prior to the Closing
Time, and such termination shall be without liability of any party to any other
party except as provided in Section 4 hereof, and provided further that Section
6 and 7 shall survive such termination.

     SECTION 6.  INDEMNIFICATION 

     (a)  INDEMNIFICATION OF UNDERWRITER.  The Company agrees to indemnify and
hold harmless the Underwriter and each person, if any, who controls the
Underwriter within the meaning of Section 15 of the 1933 Act:

          (i)  against any and all loss, liability, claim, damage and expense
     whatsoever, as incurred, arising out of any untrue statement or alleged
     untrue statement of a material fact contained in the Registration Statement
     (or any amendment thereto), including the information deemed to be part of
     the Registration Statement pursuant to Rule 430A(b) of the 1933 Act Regula-
     tions, if applicable, and all documents incorporated therein by reference,
     or the omission or alleged omission therefrom of a material fact required
     to be stated therein or necessary to make the statements therein not mis-
     leading or arising out of any untrue statement or alleged untrue statement
     of a material fact contained in any preliminary prospectus or the
     Prospectus (or any amendment or supplement thereto), or the omission or
     alleged omission therefrom of a material fact necessary in order to make
     the statements therein, in


                                       31

<PAGE>

light of the circumstances under which they were made, not misleading;

          (ii)  against any and all loss, liability, claim, damage and expense
     whatsoever, as incurred, to the extent of the aggregate amount paid in set-
     tlement of any litigation, or any investigation or proceeding by any
     governmental agency or body, commenced or threatened, or of any claim
     whatsoever based, in each case, upon any such untrue statement or omission,
     or any such alleged untrue statement or omission, if such settlement is
     effected with the written consent of the Company; and

          (iii)  against any and all expense whatsoever, as incurred (including,
     subject to Section 6(c) hereof, the fees and disbursements of counsel
     chosen by the Underwriter), reasonably incurred in investigating, preparing
     or defending against any litigation, or any investigation or proceeding by
     any governmental agency or body, commenced or threatened, or any claim
     whatsoever based, in each case, upon any such untrue statement or omission,
     or any such alleged untrue statement or omission, to the extent that any
     such expense is not paid under (i) or (ii) above; 

PROVIDED, HOWEVER, that this indemnity agreement shall not apply to any loss,
liability, claim, damage or expense to the extent arising out of any untrue
statement or omission or alleged untrue statement or omission made in reliance
upon and in conformity with written information furnished to the Company by the
Underwriter, or any person controlling the Underwriter, expressly for use in the
Registration Statement (or any amendment thereto) or any preliminary prospectus
or the Prospectus (or any amendment or supplement thereto); and PROVIDED,
FURTHER, that the Company shall not be liable to the Underwriter under the
indemnity agreement in this subsection (a) with respect to any preliminary
prospectus to the extent that any such loss, liability, claim, damage or expense
of the Underwriter results from the fact that the Underwriter sold Securities to
a person to whom there was not sent or given, at or prior to the written
confirmation of such sale, a copy of the Prospectus as then amended or supple-
mented (excluding documents incorporated by reference therein) in any case where
such delivery is required by


                                       32
<PAGE>

the 1933 Act if the Company has previously furnished copies thereof to the
Underwriter and the loss, liability, claim, damage or expense of the Underwriter
results from an untrue statement or omission or alleged untrue statement or
omission of a material fact contained in the preliminary prospectus which was
corrected in the Prospectus (or the Prospectus as amended or supplemented). 

     (b)  INDEMNIFICATION OF COMPANY, DIRECTORS AND OFFICERS.  The Underwriter
agrees to indemnify and hold harmless the Company, its directors, each of its
officers who signed the Registration Statement, and each person, if any, who
controls the Company within the meaning of Section 15 of the 1933 Act, against
any and all loss, liability, claim, damage and expense described in the
indemnity contained in subsection (a) of this Section, as incurred, but only
with respect to untrue statements or omissions, or alleged untrue statements or
omissions, made in the Registration Statement (or any amendment thereto), or any
preliminary prospectus or the Prospectus (or any amendment or supplement
thereto) in reliance upon and in conformity with written information furnished
to the Company by the Underwriter expressly for use in the Registration
Statement (or any amendment thereto) or such preliminary prospectus or the
Prospectus (or any amendment or supplement thereto).

     (c)  ACTIONS AGAINST PARTIES; NOTIFICATION.  Each indemnified party shall
give notice as promptly as reasonably practicable to each indemnifying party of
any action commenced against it in respect of which indemnity may be sought
hereunder, but failure to so notify an indemnifying party shall not relieve such
indemnifying party from any liability which it may have otherwise than on
account of this indemnity agreement.  An indemnifying party may participate at
its own expense in the defense of any such action.  If it so elects within a
reasonable time after receipt of such notice, an indemnifying party, jointly
with any other indemnifying parties receiving such notice, may assume the
defense of such action with counsel chosen by it and approved by the indemnified
parties defendant in such action, PROVIDED that, if such indemnified party or
parties reasonably determine that there may be legal defenses available to them
which are different from or in addition to those available to such indemnifying
party or parties, then such indemnifying party or parties shall not be entitled
to assume such de-


                                       33
<PAGE>

fense.  If the indemnifying party or parties are not entitled to assume the
defense of such action as a result of the proviso to the preceding sentence,
counsel for the indemnifying party or parties shall be entitled to conduct the
defense of such indemnifying party or parties and counsel for the indemnified
party or parties shall be entitled to conduct the defense of such indemnified
party or parties.  If an indemnifying party is entitled to so assume the defense
of such action and does in fact assume the defense of such action, the
indemnifying parties shall not be liable for any fees and expenses of counsel
for the indemnified parties incurred thereafter in connection with such action. 
In no event shall the indemnifying parties be liable for fees and expenses of
more than one counsel (in addition to any local counsel) separate from their own
counsel for all indemnified parties in connection with any one action or
separate but similar or related actions in the same jurisdiction arising out of
the same general allegations or circumstances.

     SECTION 7.  CONTRIBUTION.  In order to provide for just and equitable
contribution in circumstances in which the indemnification provided for in
Section 6 hereof is for any reason held to be unenforceable by indemnified
parties although applicable in accordance with its terms, the Company and the
Underwriter shall contribute to the aggregate losses, liabilities, claims
damages and expenses of the nature contemplated by said indemnification incurred
by the Company and the Underwriter as incurred, in such proportions that the
Underwriter is responsible for that portion represented by the percentage that
the underwriting discount appearing on the cover page of the Prospectus bears to
the initial public offering price appearing thereon and the Company is
responsible for the balance; PROVIDED, HOWEVER, that no person guilty of
fraudulent misrepresentation (within the meaning of Section 11(f) of the 1933
Act) shall be entitled to contribution from any person who was not guilty of
such fraudulent misrepresentation.  For purposes of this Section, each person,
if any, who controls the Underwriter within the meaning of Section 15 of the
1933 Act shall have the same rights to contribution as the Underwriter, and each
director of the Company, each officer of the Company who signed the Registration
Statement, and each person, if any, who controls the Company within the


                                       34
<PAGE>

meaning of Section 15 of the 1933 Act shall have the same rights to contribution
as the Company.

     SECTION 8.  REPRESENTATIONS, WARRANTIES AND AGREEMENTS TO SURVIVE DELIVERY.
The representations, warranties, indemnities, agreements and other statements of
the Company or its officers set forth in this Agreement and the Pricing
Agreement or contained in certificates of officers of the Company submitted
pursuant hereto, shall remain operative and in full force and effect, regardless
of any investigation made by or on behalf of the Underwriter or controlling,
person, or by or on behalf of the Company, and shall survive delivery of the
Securities to the Underwriter.  The indemnities of the Underwriter set forth in
this Agreement and the Pricing Agreement shall remain operative and in full
force and effect regardless of any investigation made by or on behalf of the
Company, its directors, officers or controlling persons, or by or on behalf of
the Underwriter, and shall survive delivery to the Securities by, and payment
for the Securities to, the Company.

     SECTION 9.  TERMINATION OF AGREEMENT.  (a)  TERMINATION; GENERAL.  The 
Underwriter may terminate this Agreement, by notice to the Company, at any 
time at or prior to Closing Time (i) if there has been, since the time of 
execution of this Agreement or since the respective dates as of which 
information is given in the Prospectus, any material adverse change in the 
condition, financial or otherwise, or in the earnings or business affairs of 
the Company and its subsidiaries considered as one enterprise, whether or not 
arising in the ordinary course of business, or (ii) if there has occurred any 
material adverse change in the financial markets in the United States or any 
outbreak of hostilities or escalation thereof or other calamity or crisis the 
effect of which is such as to make it, in the judgment of the Underwriter, 
impracticable to market the Securities or to enforce contracts for the sale 
of the Securities, or (iii) if trading in the Common Stock has been suspended 
by the Commission, or if trading generally on the American Stock Exchange or 
the NYSE or in the Nasdaq National Market has been suspended, or minimum or 
maximum prices for trading have been fixed, or maximum ranges for prices have 
been required, by any of said exchanges or by order of the Commission, or any 
other governmental authority, or (iv) if a banking moratorium

                                       35
<PAGE>

has been declared by either Federal, New York or California authorities.

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

     SECTION 10.  NOTICES.  All notices and other communications hereunder shall
be in writing and shall be deemed to have been duly given if mailed or
transmitted by any standard form of telecommunication.  Notices to the
Underwriter shall be directed to it at 101 California Street, San Francisco,
California 94111, Attention: D. Casey Safreno, Vice President, with copy to
Skadden, Arps, Slate, Meagher & Flom, 300 South Grand Avenue, Los Angeles,
California 90071, Attention:  Thomas C. Janson, Jr.; notices to the Company
shall be directed to it at 950 Page Mill Road, P.O. Box 10950, Palo Alto, 
California 94303-0802, Attention: Peter D. Staple, Vice President and General
Counsel, with a copy to Heller Ehrman White & McAuliffe, 525 University 
Avenue, Palo Alto, California 94301, Attention: Sarah A. O'Dowd.

     SECTION 11.  PARTIES.  This Agreement and the Pricing Agreement are made
solely for the benefit of the Company and the Underwriter, and, to the extent
expressed, any person controlling the Company or the Underwriter within the
meaning of Section 15 of the 1933 Act, and the directors of the Company and its
officers who have signed the Registration Statement, and their respective
executors, administrators, successors and assigns, and no other person shall
acquire or have any right under or by virtue of this Agreement.  The term
"successors and assigns" shall not include any purchaser, as such purchaser, of
Securities from the Underwriter. 

     SECTION 12.  GOVERNING LAW AND TIME.  This Agreement and the Pricing
Agreement shall be governed by and construed in accordance with the laws of the
State of New York applicable to agreements made and to be performed in said
State.  Unless otherwise set forth herein, specified times of day refer to New
York City time.

     SECTION 13.  AMENDMENTS.  No amendment or waiver of any provision of this
Agreement, nor any consent or


                                       36
<PAGE>

approval to any departure therefrom, shall in any event be effective unless the
same shall be in writing and signed by the parties hereto.

     SECTION 14.  COUNTERPARTS.  This Agreement may be executed in one or more
counterparts and when a counterpart has been executed by each party, all such
counterparts taken together shall constitute one and the same agreement.


                                       37
<PAGE>

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

     If the foregoing is in accordance with your understanding of our agreement,
please sign and return to the Company a counterpart hereof, whereupon this
instrument, along with all counterparts, will become a binding agreement between
the Underwriter and the Company in accordance with its terms.


                              Very truly yours,

                              ALZA CORPORATION


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




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


MERRILL LYNCH, PIERCE, FENNER & SMITH
     INCORPORATED



By: 
   -------------------------------------
          Authorized Signatory


                                       38
<PAGE>
                                                                       EXHIBIT A


                                ALZA CORPORATION

                            (a Delaware corporation)

                    $400,000,000 Principal Amount at Maturity

               ____% Convertible Subordinated Debentures due 2006



                                           ____________, 1996



MERRILL LYNCH & CO.
Merrill Lynch, Pierce, Fenner & Smith
          Incorporated
Merrill Lynch World Headquarters
North Tower
World Financial Center
New York, New York  10281-1209

Ladies and Gentlemen:

          Reference is made to the Purchase Agreement dated as of __________,
1996 (the "Purchase Agreement") relating to the purchase by Merrill Lynch & Co.,
Merrill Lynch, Pierce, Fenner & Smith Incorporated (the "Purchaser") of the
above __% Convertible Subordinated Debentures due 2006 (the "Securities") of
ALZA Corporation (the "Company").

          Pursuant to Section 2 of the Purchase Agreement, the Company agrees
with the Purchaser as follows:  

          1.   The initial issue price per $1,000 principal amount of Securities
shall be $1,000.

          2.   The interest rate on the Securities shall be ____% per annum.

          3.   The initial Conversion Price shall be $___ per share of the
Company's Common Stock, $0.01 par value per share. 

<PAGE>

          4.   The purchase price per $1,000 principal amount of Securities to
be paid by the Purchaser shall be $_______, being an amount equal to the
initial public offering price set forth above, less $___ per $1,000 principal
amount of Securities.

          If the foregoing is in accordance with your understanding of our
agreement, please sign and return to the Company a counterpart hereof, whereupon
this instrument, along with all counterparts, will become a binding agreement
between the Purchaser and the Company in accordance with its terms.

                              Very truly yours,

                              ALZA CORPORATION 



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


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



MERRILL LYNCH, PIERCE, FENNER & SMITH
          INCORPORATED 



By:                                     
   -------------------------------------
      Authorized Signatory


                                        2

 


<PAGE>


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



                                   ALZA CORPORATION

                                          TO

                            THE CHASE MANHATTAN BANK, N.A.
                                       Trustee


                                      INDENTURE

                              Dated as of April __, 1996


                                     $400,000,000*


                   __% Convertible Subordinated Debentures due 2006


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

- ----------------------------
*   $460,000,000 if the Over-Allotment Option is exercised in full.

<PAGE>

         INDENTURE, dated as of April __, 1996, between ALZA Corporation, a
Delaware corporation (the "Company," as more fully set forth in Section 1.1),
and The Chase Manhattan Bank, N.A., a national banking association duly
organized and existing under the laws of the United States, not in its 
individual capacity but solely as trustee (the
"TRUSTEE," as more fully set forth in Section 1.1).

                                 W I T N E S S E T H:

         WHEREAS, the Company has duly authorized the issue of its __%
Convertible Subordinated Debentures due 2006 (the "DEBENTURES"), in an aggregate
principal amount specified herein and has duly authorized the execution and
delivery of this Indenture.

         NOW, THEREFORE:

         Each party agrees as follows for the benefit of the other party and
for the equal and ratable benefit of the respective holders from time to time of
the Debentures:

                                      ARTICLE I

                                     DEFINITIONS

         Section 1.1  DEFINITIONS.  The terms defined in this Section 1.1
(except as otherwise expressly provided herein or in any indenture supplemental
hereto) for all purposes of this Indenture and of any indenture supplemental
hereto shall have the respective meanings set forth in this Section 1.1.

         AFFILIATE:  The term "Affiliate" of any specified Person shall mean
any other Person directly or indirectly controlling or controlled by or under
direct or indirect common control with such specified Person.  For the purpose
of this definition, "control," when used with respect to any specified Person
means the power to direct or cause the direction of the management and policies
of such Person, directly or indirectly, whether through the ownership of voting
securities, by contract or otherwise; and the terms "controlling" and
"controlled" shall have meanings correlative to the foregoing.

         BOARD OF DIRECTORS:  The term "Board of Directors" or "Board" shall
mean, with respect to any matter, the Board of Directors of the Company or a
committee of such Board duly authorized, with respect to such matter, to
exercise the power of such Board.

         BUSINESS DAY:  The term "Business Day" means each Monday, Tuesday,
Wednesday, Thursday and Friday on which banking institutions in The City of New
York are not authorized or obligated by law or executive order to close.

<PAGE>

         Cash or cash:  The term "cash" means such coin or currency of The
         ----    ----
United States of America as at any time of payment is legal tender for the
payment of public and private debts.

         COMMISSION:  The term "Commission" shall mean the Securities and
Exchange Commission.

         COMMON STOCK:  The term "Common Stock" means the Common Stock, par
value $.01 per share, of the Company as it exists on the date of this Indenture
or any other shares of capital stock of the Company into which such common stock
shall be reclassified or changed.

         COMPANY:  The term "Company" shall mean ALZA Corporation, a Delaware
corporation, until a successor replaces it pursuant to the provisions of Article
XI and, thereafter, shall mean such successors.  The foregoing sentence shall
likewise apply to any subsequent successor or successors.

         COMPANY ORDER:  The term "Company Order" shall mean a written order 
signed in the name of the Company by (a) either of its Co-Chairmen of the 
Board, its Chief Executive Officer, President or any Vice President, and (b) 
by its Treasurer, an Assistant Treasurer, its Secretary or an Assistant 
Secretary, and delivered to the Trustee.

         CORPORATE TRUST OFFICE:  The term "Corporate Trust Office" shall 
mean the principal office of the Trustee at which at any particular time its 
corporate trust business shall be principally administered, which office is, 
at the date as of which this Indenture is dated, located at 4 Chase MetroTech 
Center, 3rd Floor, Brooklyn, New York, 11245 Attention:  Institutional Trust 
Group.

         DEBENTURE or DEBENTURES:  The terms "Debenture" or "Debentures" shall
mean any Debenture or Debentures, as the case may be, authenticated and
delivered under this Indenture.


         DEBENTUREHOLDER or HOLDER:  The terms "Debentureholder" or "Holder" as
applied to any Debenture, shall mean any person in whose name such Debenture is
registered on the Registrar's books.

         DEFAULT:  The term "Default" shall mean any event that is, or after
notice or passage of time, or both, would be, an Event of Default.

         EXCHANGE ACT:  The term "Exchange Act" shall mean the Securities
Exchange Act of 1934, as amended and the rules and regulations of the Commission
promulgated thereunder, as in effect from time to time.

                                          2

<PAGE>

         EVENT OF DEFAULT:  The term "Event of Default":  shall mean any event
specified in Section 6.1(a), (b), (c), (d), (e), (f) or (g).

         INDENTURE:  The term "Indenture" shall mean this instrument as
originally executed or, if amended or supplemented in accordance with the terms
hereof, as so amended or supplemented.

         OFFICER:  The term "Officer" means either Co-Chairman of the Board,
the Chief Executive Officer, President, any Vice President, the Treasurer, the
Secretary, any Assistant Treasurer or Assistant Secretary of the Company.  

         OFFICERS' CERTIFICATE:  The term "Officers' Certificate," when used
with respect to the Company, shall mean a written certificate containing the
information specified in Section 11.3, 16.5 or 16.6 signed by both (a) the
President, the Chief Executive Officer, Executive or Senior Vice President or
any Vice President (whether or not designated by a number or numbers or word or
words added before or after the title "Vice President") and (b) by the Treasurer
or any Assistant Treasurer or Secretary or any Assistant Secretary of the
Company.

         OPINION OF COUNSEL:  The term "Opinion of Counsel" shall mean a
written opinion containing the information specified in Section 11.3, 16.5 or
16.6, of counsel who may be an employee of or counsel to the Company, or other
counsel acceptable to the Trustee.

         OVER-ALLOTMENT OPTION:  The term "Over-Allotment Option" shall mean
the option of the Underwriter to purchase additional Debentures in the
aggregate principal amount of up to $60,000,000 as provided in the Purchase
Agreement referred to in Section 2.2 hereof.

         PERSON:  The term "Person" shall mean any individual, corporation,
partnership, joint venture, association, joint stock company, trust,
unincorporated organization or government or any agency or political subdivision
thereof.

         PREDECESSOR DEBENTURE:  The term "Predecessor Debenture" of any
particular Debenture shall mean every previous Debenture evidencing all or a
portion of the same debt as that evidenced by such particular Debentures; and,
for the purposes of this definition, any Debenture authenticated and delivered
under Section 2.7 in lieu of a lost, destroyed or stolen Debenture shall be
deemed to evidence the same debt as the lost, destroyed or stolen Debenture that
it replaces.

                                          3

<PAGE>

         REDEMPTION DATE:  The term "Redemption Date" means the date specified
for redemption of any of the Debentures in accordance with the terms of the
Debentures and this Indenture.

         REDEMPTION PRICE:  The term "Redemption Price" shall have the meaning
set forth in the Debentures.

         RESPONSIBLE OFFICER:  The term "Responsible Officer," shall mean, 
with respect to the Trustee, any officer within the Corporate Trust Office,
including any Vice President, Managing Director, Assistant Vice President, 
Secretary, Assistant Secretary or any other officer of the Trustee 
customarily performing functions similar to those performed by any of the 
above designated officers and also, with respect to a particular matter, any 
other officer to whom such matter is referred because of such officer's 
knowledge and familiarity with the particular subject. 

         SECURITIES ACT:  The term "Securities Act" shall mean the Securities
Act of 1933, as amended, and the rules and regulations of the Commission
promulgated thereunder.

         SENIOR INDEBTEDNESS:  The term "Senior Indebtedness" means the
principal of, and premium, if any, and unpaid interest on, all present and
future (i) indebtedness of the Company for borrowed money, (ii) obligations of
the Company evidenced by bonds, debentures, notes or similar instruments, (iii)
indebtedness incurred, assumed or guaranteed by the Company in connection with
the acquisition by it or a Subsidiary of any business, properties or assets
(except purchase-money indebtedness classified as accounts payable under
generally accepted accounting principles), (iv) obligations of the Company as
lessee under (A) leases required to be capitalized on the balance sheet of the
lessee under generally accepted accounting principles and (B) leases of property
or assets made as part of any sale and leaseback transaction to which the
Company is a party, (v) reimbursement obligations of the Company in respect of
letters of credit relating to indebtedness or other obligations of the Company
that qualify as indebtedness or obligations of the kind referred to in clauses
(i) through (iv) above, and (vi) obligations of the Company under direct or
indirect guaranties in respect of, and obligations (contingent or otherwise) to
purchase or otherwise acquire, or otherwise to assure a creditor against loss in
respect of, indebtedness or obligations of others of the kinds referred to in
clauses (i) through (v) above, in each case unless in the instrument creating or
evidencing the indebtedness or obligation or pursuant to which the same is
outstanding it is provided that such indebtedness or obligation is not superior
in right of payment to the Debentures.  Notwithstanding the foregoing, the term
Senior Indebtedness shall not include any Indebtedness of the Company to any
subsidiary of the Company, a majority of the voting stock of which is owned,
directly or indirectly, by the Company or any indebtedness or obligations under
the Company's Liquid Yield Option Notes due 2014 (Zero Coupon-
Subordinated).

                                          4

<PAGE>

         SUBSIDIARY:  The term "Subsidiary" means (i) a corporation, a 
majority of whose Capital Stock with voting power, under ordinary 
circumstances, to elect directors is, at the date of determination, directly 
or indirectly owned by the Company, by one or more Subsidiaries of the 
Company or by the Company and one or more Subsidiaries of the Company or (ii) 
a partnership in which the Company or a Subsidiary of the Company, at the 
date of determination holds in excess of 50% of the profits or voting 
interests of, or (iii) any other person (other than a corporation or a 
partnership) in which the Company, a Subsidiary of the Company or the Company
and one or more Subsidiaries of the Company, directly or indirectly, at the 
date of determination, has (x) at least a majority ownership interest or (y) 
the power to elect or direct the election of a majority of the directors or 
other governing body of such person.

         TRUST INDENTURE ACT:  The term "Trust Indenture Act" shall mean the
Trust Indenture Act of 1939, as amended as it was in force at the date of
execution of this Indenture. 

         TRUST OFFICER:  The term "Trust Officer" means any officer of the
Trustee assigned by the Trustee to administer its corporate trust matters.

         TRUSTEE:  The term "Trustee" shall mean The Chase Manhattan Bank, N.A.
and its successors and any corporation resulting from or surviving any
consolidation or merger to which it or its successors may be a party and any
successor trustee at the time serving as successor trustee hereunder.

         UNDERWRITER:  The term "Underwriter" means Merrill Lynch, Pierce
Fenner & Smith Incorporated.

         Section 1.2  OTHER DEFINITIONS:
                                                                 Defined in
              Term                                                 Section
              ----                                               ----------

"Beneficial Owner" . . . . . . . . . . . . . . . . . . . . . . .    15.3(1)
"Capital Stock". . . . . . . . . . . . . . . . . . . . . . . . .       14.6
"Change in Control". . . . . . . . . . . . . . . . . . . . . . .       15.4
"Closing Price". . . . . . . . . . . . . . . . . . . . . . . . . 14.5(g)(1)
"Company Notice" . . . . . . . . . . . . . . . . . . . . . . . .    15.2(a)
"Conversion Agent" . . . . . . . . . . . . . . . . . . . . . . .        2.3
"Conversion Price" . . . . . . . . . . . . . . . . . . . . . . .       14.4
"Current Market Price" . . . . . . . . . . . . . . . . . . . . . 14.5(g)(2)
"Legal Holiday". . . . . . . . . . . . . . . . . . . . . . . . .       16.7
"Paying Agent" . . . . . . . . . . . . . . . . . . . . . . . . .        2.3
"Purchase Agreement" . . . . . . . . . . . . . . . . . . . . . .        2.2
"Registrar". . . . . . . . . . . . . . . . . . . . . . . . . . .        2.3

                                          5

<PAGE>

"Repurchase Date". . . . . . . . . . . . . . . . . . . . . . . .       15.1
"Repurchase Price" . . . . . . . . . . . . . . . . . . . . . . .       15.1
"Senior Indebtedness Default". . . . . . . . . . . . . . . . . .        4.2
"Trading Day". . . . . . . . . . . . . . . . . . . . . . . . . . 14.5(g)(5)
"Trigger Event". . . . . . . . . . . . . . . . . . . . . . . . .    14.5(d)

         Section 1.3  INCORPORATION BY REFERENCE OF TRUST INDENTURE ACT. 
Whenever this Indenture refers to a provision of the Trust Indenture Act, such
provision is incorporated by reference in and made a part of this Indenture. 
The following Trust Indenture Act terms used in this Indenture have the
following meanings:

    "Commission" means the Securities and Exchange Commission.

    "indenture securities" means the Debentures.

    "indenture security holder" means a Debentureholder.

    "indenture to be qualified" means this Indenture.

    "indenture trustee" or "institutional trustee" means the Trustee.

    "obligor" on the indenture securities means the Company.

         All other Trust Indenture Act terms used in this Indenture that are
defined by the Trust Indenture Act or defined by Trust Indenture Act reference
to another statute or regulation have the meanings assigned to them by such
definitions.

         Section 1.4  RULES OF CONSTRUCTION.  Unless the context otherwise
requires:

              (1)  a term has the meaning assigned to it;

              (2)  an accounting term not otherwise defined has the meaning
assigned to it in accordance with generally accepted accounting principles as in
effect from time to time in The United States of America;

              (3)  "or" is not exclusive;

              (4)  "including" means including, without limitation; 

              (5)  words in the singular include the plural, and words in the
plural include the singular; and

                                          6

<PAGE>

              (6)  the words "herein," "hereof," "hereunder," and words of
similar import refer to this Indenture as a whole and not to any particular
Article, Section or other Subdivision.

                                      ARTICLE II

                                    THE DEBENTURES

         Section 2.1  FORM AND DATING.  The Debentures and the Trustee's
certificate of authentication shall be substantially in the form of Exhibit A,
which is a part of this Indenture.  The Debentures may have notations, legends
or endorsements required by law, stock exchange rule or usage (provided that any
such notation, legend or endorsement required by usage is in a form acceptable
to the Company and the Trustee).  Each Debenture shall be dated the date of its
authentication.

         Section 2.2  EXECUTION AND AUTHENTICATION.  The Debentures shall be
executed by the Company by either of its Co-Chairmen of the Board, its President
or one of its Vice Presidents, under its corporate seal reproduced thereon
attested by its Secretary or one of its Assistant Secretaries.  The signature of
any of these officers on the Debentures may be manual or facsimile.

         Debentures bearing the manual or facsimile signatures of individuals
who were the proper Officers of the Company shall bind the Company,
notwithstanding that such individuals or any of them have ceased to hold such
offices prior to the authentication and delivery of such Debentures or did not
hold such offices at the time of issuance of such Debentures.

         No Debenture shall be entitled to any benefit under this Indenture or
be valid or obligatory for any purpose unless there appears on such Debenture a
certificate of authentication substantially in the form provided for herein duly
executed by the Trustee by manual signature of an authorized signatory, and such
certificate upon any Debenture shall be conclusive evidence, and the only
evidence, that such Debenture has been duly authenticated and delivered
hereunder.

         The Trustee shall authenticate and make available for delivery
Debentures for original issue in an aggregate principal amount of up to
$400,000,000 upon a Company Order without any further action by the Company;
PROVIDED, HOWEVER, that in the event that the Company sells any Debentures
pursuant to the Over Allotment Option granted pursuant to Section 2(b) of the
Purchase Agreement, dated _________, 1996, between the Company and the
Underwriter (the "PURCHASE AGREEMENT"), then the Trustee shall authenticate and
deliver Debentures for original issue in an aggregate principal amount of up to
$400,000,000 plus up to

                                          7

<PAGE>

$60,000,000 aggregate principal amount of the Debentures sold pursuant to the
Over-Allotment Option upon a Company Order without any further action by the
Company.  The aggregate principal amount of the Debentures outstanding at any
time may not exceed the amount set forth in the foregoing sentence, subject to
the proviso set forth therein, except as provided in Section 2.7.

         Section 2.3  REGISTRAR, PAYING AGENT AND CONVERSION AGENT.  The
Company shall maintain an office or agency where the Debentures may be presented
for registration of transfer or for exchange ("REGISTRAR"), an office or agency
where the Debentures may be presented for repurchase or payment ("PAYING AGENT")
and an office or agency where the Debentures may be presented for conversion
("CONVERSION AGENT").  The Registrar shall keep a register of the Debentures and
of their transfer and exchange.  The Company may have one or more co-registrars,
one or more additional paying agents and one or more additional conversion
agents.  The term Paying Agent includes any additional paying agents.  The term
Conversion Agent includes any additional conversion agent.

         The Company shall enter into an appropriate agency agreement with any
Registrar, Paying Agent, Conversion Agent or co-registrar (with the consent of
the Trustee) other than the Trustee.  The agreement shall implement the
provisions of this Indenture that relate to such agent.  The Company shall
notify the Trustee and the Holders of the name and address of any such agent and
of any change in the office or agency referred to in Section 5.2.  If the
Company fails to maintain a Registrar, Paying Agent or Conversion Agent, the
Trustee shall act as such and shall be entitled to appropriate compensation
therefor pursuant to Section 7.7.  The Company or any Subsidiary or an Affiliate
of either of them may act as Paying Agent, Registrar, Conversion Agent or co-
registrar.

         The Company initially appoints the Trustee as Registrar, Conversion
Agent and Paying Agent in connection with the Debentures.

         Section 2.4  PAYING AGENT TO HOLD ASSETS IN TRUST.  Except as
otherwise provided herein, prior to or on each due date of payments in respect
of any Debenture, the Company shall deposit with the Paying Agent cash or, if
permitted by the terms hereof, securities sufficient to make such payments when
so becoming due.  The Company shall require each Paying Agent (other than the
Trustee) to agree in writing that the Paying Agent shall hold in trust for the
benefit of Debentureholders or the Trustee all assets held by the Paying Agent
for the making of payments in respect of the Debentures and shall notify the
Trustee of any default by the Company in making any such payment.  At any time
during the continuance of any such default, the Paying Agent shall, upon the
written request of the Trustee, forthwith pay to

                                          8

<PAGE>

the Trustee all assets so held in trust.  If the Company, a Subsidiary or an
affiliate of either of them acts as Paying Agent, it shall segregate the assets
held by it as Paying Agent and hold it as a separate trust fund.  The Company at
any time may require a Paying Agent to pay all assets held by it to the Trustee
and to account for any assets disbursed by it.  Upon doing so, the Paying Agent
shall have no further liability for the money and securities.  

         Section 2.5  DEBENTUREHOLDER LISTS.  The Trustee shall preserve in 
as current a form as is reasonably practicable the most recent list available 
to it of the names and addresses of Debentureholders.  If the Trustee is not 
the Registrar, the Company shall furnish or cause to be furnished to the 
Trustee (i) at least semiannually on January 1 and July 1 a list of the names 
and addresses of Debentureholders dated within 15 days of the date on which 
the list is furnished and (ii) at such other times as the Trustee may request 
in writing a list, in such form and as of such date as the Trustee may 
reasonable require, of the names and addresses of Debentureholders.

         Section 2.6  TRANSFER AND EXCHANGE.  Upon surrender for registration
of transfer of any Debenture, together with a written instrument of transfer
satisfactory to the Registrar duly executed by the Debentureholder or such
Debentureholder's attorney duly authorized in writing, at the office or agency
of the Company designated as Registrar or co-registrar pursuant to Section 2.3
or at the office or agency referred to in Section 5.2, the Company shall
execute, and the Trustee shall authenticate and deliver, in the name of the
designated transferee or transferees, one or more new Debentures of any
authorized denomination or denominations, of a like aggregate principal amount. 
The Company shall not charge a service charge for any registration of transfer
or exchange, but the Company may require payment of a sum sufficient to pay all
taxes, assessments or other governmental charges that may be imposed in
connection with the transfer or exchange of the Debentures from the
Debentureholder requesting such transfer or exchange (other than any exchange of
a temporary Debenture for a definitive Debenture not involving any change in
ownership).  

         Transfers of Debentures may be effected only by surrender of the 
Debentures to the Company for registration and the issuance by the Company of 
one or more new Debentures.  As provided in Section 9.3, until such surrender 
and registration, the Company may treat the holders of Debentures appearing 
on the Debenture register as the absolute owners of such Debentures.

         At the option of the Holder, Debentures may be exchanged for other 
Debentures of any authorized denomination or denominations, of a like 
aggregate principal amount, upon surrender of the Debentures to be exchanged, 
together with a written

                                          9

<PAGE>


instrument of transfer satisfactory to the Registrar duly executed by the
Debentureholder or such Debentureholder's attorney duly authorized in writing,
at such office or agency.  Whenever any Debentures are so surrendered for
exchange, the Company shall execute, and the Trustee shall authenticate and
deliver, the Debentures which the Holder making the exchange is entitled to
receive.

         The Company shall not be required to make, and the Registrar need not
register, transfers or exchanges of (a) Debentures selected for redemption
(except, in the case of Debentures to be redeemed in part, the portion thereof
not to be redeemed), (b) any Debentures in respect of which a repurchase notice
has been given and not withdrawn by the Holder thereof in accordance with
Section 15.2 (except, in the case of Debentures to be purchased in part, the
portion thereof not to be purchased) or (c) any Debentures for a period of 15
days before a selection of the Debentures to be redeemed.

         Section 2.7  REPLACEMENT DEBENTURES.  If (a) any mutilated Debenture
is surrendered to the Company or the Trustee, or (b) the Company and the Trustee
receive evidence to their satisfaction of the destruction, loss or theft of any
Debenture, and there is delivered to the Company and the Trustee such security
or indemnity as may be required by them to save each of them harmless, then, in
the absence of notice to the Company or the Trustee that such Debenture has been
acquired by a BONA FIDE purchaser, the Company shall execute, and upon its
written request the Trustee shall authenticate and deliver, in exchange for any
such mutilated Debenture or in lieu of any such destroyed, lost or stolen
Debenture, a new Debenture of like tenor and principal amount, bearing a number
not contemporaneously outstanding.

         In case any such mutilated, destroyed, lost or stolen Debenture has
become or is about to become due and payable, or is about to be redeemed by the
Company pursuant to Article III hereof, the Company in its discretion may,
instead of issuing a new Debenture, pay or redeem such Debenture, as the case
may be.

         Upon the issuance of any new Debentures under this Section, the
Company may require the payment of a sum sufficient to cover any tax or other
governmental charge that may be imposed in relation thereto and any other
expenses (including the fees and expenses of the Trustee) in connection
therewith.

         Every new Debenture issued pursuant to this Section in lieu of any
mutilated, destroyed, lost or stolen Debenture shall constitute an original
additional contractual obligation of the Company, whether or not the destroyed,
lost or stolen Debenture shall be at any time enforceable by anyone, and shall
be entitled


                                          10

<PAGE>

to all benefits of this Indenture equally and proportionately with any and all
other Debentures duly issued hereunder.

         The provisions of this Section are exclusive and shall preclude (to
the extent lawful) all other rights and remedies with respect to the replacement
or payment of mutilated, destroyed, lost or stolen Debentures.

         Section 2.8  OUTSTANDING DEBENTURES; DETERMINATIONS OF HOLDERS' ACTION.
Debentures outstanding at any time are all the Debentures authenticated
by the Trustee except for those cancelled by it, those delivered to it for
cancellation, mutilated, destroyed, lost or stolen Debentures for which the
Trustee has authenticated and made available for delivery a new Debenture in
lieu therefor pursuant to Section 2.7 and those described in this Section 2.8 as
not outstanding.  A Debenture does not cease to be outstanding because the
Company or an Affiliate thereof holds the Debenture;  PROVIDED, HOWEVER, that in
determining whether the Holders of the requisite principal amount of Debentures
have given or concurred in any request, demand, authorization, direction,
notice, consent or waiver hereunder, Debentures owned by the Company or any
other obligor upon the Debentures or any Affiliate of the Company or such other
obligor shall be disregarded and deemed not to be outstanding, except that, in
determining whether the Trustee shall be protected in relying upon any such
request, demand, authorization, direction, notice, consent or waiver, only
Debentures which the Trustee knows to be so owned shall be so disregarded.
Subject to the foregoing, only Debentures outstanding at the time of such
determination shall be considered in any such determination (including, without
limitation, determinations pursuant to Articles VI and X).

         If a Debenture is replaced pursuant to Section 2.7, it ceases to be
outstanding unless the Trustee receives proof satisfactory to it that the
replaced Debenture is held by a BONA FIDE purchaser.

         If the Paying Agent holds, in accordance with this Indenture, on a
Redemption Date or on a Repurchase Date, or on the stated maturity date, cash
or, if permitted by the terms hereof, securities sufficient to pay the
Debentures payable on that date, then on and after that date such Debentures
shall cease to be outstanding and interest, if any, on such Debentures shall
cease to accrue and all other rights of the Holder shall terminate (other than
the right to receive the applicable Redemption Price or Repurchase Price, upon
delivery of the Debenture in accordance with the terms of this Indenture);
PROVIDED, that if such Debentures are to be redeemed, notice of such redemption
has been duly given pursuant to this Indenture or provision therefor
satisfactory to the Trustee has been made.


                                          11

<PAGE>

         If a Debenture is converted in accordance with Article XIV then from
and after such conversion the Debenture shall cease to be outstanding and
interest, if any, shall cease to accrue on such Debenture.

         Section 2.9  TEMPORARY DEBENTURES.  Pending the preparation of
definitive Debentures, the Company may execute, and upon Company Order the
Trustee shall authenticate and deliver, temporary Debentures which are printed,
lithographed, typewritten, mimeographed or otherwise produced, in any authorized
denomination, substantially of the tenor of the definitive Debentures in lieu of
which they are issued and with such appropriate insertions, omissions,
substitutions and other variations as the Officers executing such Debentures may
determine, as conclusively evidenced by their execution of such Debentures.

         If temporary Debentures are issued, the Company will cause definitive
Debentures to be prepared without unreasonable delay.  After the preparation of
definitive Debentures, the temporary Debentures shall be exchangeable for
definitive Debentures upon surrender of the temporary Debentures at the office
or agency of the Company designated for such purpose pursuant to Section 2.3 or
5.2, without charge to the Holder.  Upon surrender for cancellation of any one
or more temporary Debentures the Company shall execute and the Trustee shall
authenticate and deliver in exchange therefor a like principal amount of
definitive Debentures of authorized denominations.  Until so exchanged the
temporary Debentures shall in all respects be entitled to the same benefits
under this Indenture as definitive Debentures.

         Section 2.10  CANCELLATION.  All Debentures surrendered for payment,
redemption by the Company pursuant to Article III, conversion pursuant to
Article XIV, repurchase by the Company pursuant to Article XV, registration of
transfer or exchange shall, if surrendered to any person other than the Trustee,
be delivered to the Trustee and shall be promptly cancelled by it.  The Company
may at any time deliver to the Trustee for cancellation any Debentures
previously authenticated and delivered hereunder which the Company may have
acquired in any manner whatsoever, and all Debentures so delivered shall be
promptly cancelled by the Trustee.  The Company may not issue new Debentures to
replace Debentures it has paid or delivered to the Trustee for cancellation or
that any Holder has converted pursuant to Article XIV.  No Debentures shall be
authenticated in lieu of or in exchange for any Debentures cancelled as provided
in this Section, except as expressly permitted by this Indenture.  All cancelled
Debentures held by the Trustee shall be disposed of by the Trustee in accordance
with its normal procedures and evidence of such disposition shall be delivered
to the Company unless the Company directs by Company Order that the Trustee
deliver cancelled Debentures to the Company.


                                          12

<PAGE>

                                     ARTICLE III

                                      REDEMPTION

         Section 3.1  RIGHT TO REDEEM; NOTICES TO TRUSTEE.  The Company, at its
option, may redeem the Debentures for cash in accordance with the provisions set
forth in the Debentures.  If the Company elects to redeem Debentures pursuant to
such provisions, it shall notify the Trustee in writing of the Redemption Date,
the principal amount of Debentures to be redeemed and the Redemption Price.

         The Company shall give the notice to the Trustee provided for in this
Section 3.1 at least 60 days before the Redemption Date (unless a shorter notice
shall be satisfactory to the Trustee).  If fewer than all the Debentures are to
be redeemed, the record date relating to such redemption shall be selected by
the Company and given to the Trustee, which record date shall not be less than
ten days after the date of notice to the Trustee (unless a shorter notice shall
be satisfactory to the Trustee).

         Section 3.2  SELECTION OF DEBENTURES TO BE REDEEMED.  If less than all
the Debentures are to be redeemed, the Trustee shall select the Debentures to be
redeemed PRO RATA or by lot, or by any other method the Trustee considers fair
and appropriate (so long as such method is not prohibited by the rules of any
stock exchange on which the Debentures are then listed).  The Trustee shall make
the selection at least 35 but not more than 60 days before the Redemption Date
from outstanding Debentures not previously called for redemption.  The Trustee
may select for redemption portions of the principal amounts of Debentures that
have denominations larger than $1,000.  Debentures and portions of them the
Trustee selects shall be in principal amounts of $1,000 or an integral multiple
of $1,000.  Provisions of this Indenture that apply to Debentures called for
redemption also apply to portions of Debentures called for redemption.  The
Trustee shall notify the Company promptly, but not less than 35 days before the
Redemption Date, of the Debentures or portions of Debentures to be redeemed.

         If any Debenture selected for partial redemption is thereafter
surrendered for conversion in part before termination of the conversion right
with respect to the portion of the Debenture so selected, the converted portion
of such Debenture shall be deemed (so far as may be), solely for purposes of
determining the aggregate principal amount of Debentures to be redeemed by the
Company, to be the portion selected for redemption.  Debentures that have been
converted during a selection of Debentures to be redeemed may be treated by the
Trustee as outstanding for the purpose of such selection.  Nothing in this
Section 3.2 shall affect the right of any Holder to convert any


                                          13

<PAGE>

Debenture pursuant to Article XIV before the termination of the conversion right
with respect thereto.

         Section 3.3  NOTICE OF REDEMPTION.  At least 30 days but not more than
60 days before a Redemption Date, the Company shall mail a notice of redemption
by first-class mail to each Holder of Debentures to be redeemed in the manner
provided in Section 16.3.

         The notice shall identify the Debentures to be redeemed and shall
state:

              (1)  the Redemption Date;

              (2)  the Redemption Price;

              (3)  the Conversion Price;

              (4)  the name and address of the Paying Agent and Conversion
Agent and of the office or agency referred to in Section 5.2;

              (5)  that Debentures called for redemption may be converted at
any time before the close of business on the Redemption Date;

              (6)  that Holders who want to convert Debentures must satisfy the
requirements set forth in the Debentures;

              (7)  that Debentures called for redemption must be surrendered to
the Paying Agent or at the office or agency referred to in Section 5.2 to
collect the Redemption Price;

              (8)  the CUSIP number of the Debentures;

              (9)  if fewer than all the outstanding Debentures are to be
redeemed, the certificate numbers and principal amounts of the particular
Debentures to be redeemed; and

              (10)  that, unless the Company defaults in payment of the
Redemption Price, interest, if any, on Debentures selected for redemption, will
cease to accrue on and after the Redemption Date.

         At the Company's written request, the Trustee shall give the notice of
redemption in the Company's name and at the Company's expense.

         Section 3.4  EFFECT OF NOTICE OF REDEMPTION.  Once notice of
redemption is given, Debentures called for redemption become due and payable on
the Redemption Date stated in the


                                          14

<PAGE>

notice and at the Redemption Price therefor except for Debentures that are
converted in accordance with the terms of this Indenture.  Upon the later of the
Redemption Date and the date such Debentures are surrendered to the Paying Agent
or at the office or agency referred to in Section 5.2, such Debentures called
for redemption shall be paid at the Redemption Price therefor.

         Section 3.5  DEPOSIT OF REDEMPTION PRICE.  Prior to or on the
Redemption Date, the Company shall deposit with the Paying Agent (or if the
Company or a Subsidiary or an Affiliate of either of them is the Paying Agent,
shall segregate and hold in trust) cash sufficient to pay the Redemption Price
of all Debentures to be redeemed on that date other than Debentures or portions
of Debentures called for redemption which prior thereto have been delivered by
the Company to the Trustee for cancellation.  The Paying Agent shall as promptly
as practicable return to the Company any cash, with interest, if any, thereon,
not required for that purpose because of conversion of Debentures pursuant to
Article XIV.  If such cash is then held by the Company or a Subsidiary or an
Affiliate of the Company in trust and is not required for such purpose it shall
be discharged from such trust.

         Section 3.6  DEBENTURES REDEEMED IN PART.  Upon surrender of a
Debenture that is redeemed in part, the Company shall execute, and the Trustee
shall authenticate and deliver to the Holder, a new Debenture in an authorized
denomination equal in principal amount to the unredeemed portion of the
Debenture surrendered.

         Section 3.7  CONVERSION ARRANGEMENT ON CALL FOR REDEMPTION.  In
connection with any redemption of Debentures, the Company may arrange for the
purchase and conversion of any Debentures called for redemption by an agreement
with one or more investment bankers or other purchasers to purchase all or a
portion of such Debentures by paying to the Trustee in trust for the
Debentureholders whose Debentures are to be so purchased, on or before the close
of business on the Redemption Date, an amount that, together with any amounts
deposited with the Trustee by the Company for redemption of such Debentures is
not less than the Redemption Price, together with interest, if any, accrued to
the Redemption Date, of such Debentures.  Notwithstanding anything to the
contrary contained in this Article III, the obligation of the Company to pay the
Redemption Price of such Debentures, including all accrued interest, if any,
shall be deemed to be satisfied and discharged to the extent such amount is so
paid by such purchasers but no such agreement shall relieve the Company of its
obligation to pay such Redemption Price and interest, if any.  If such an
agreement is entered into, any Debentures not duly surrendered for conversion by
the Holders thereof may, at the option of the Company be deemed, to the fullest
extent permitted (notwithstanding anything to the contrary contained in Article


                                          15

<PAGE>

XIV), surrendered by such purchasers for conversion, all as of immediately 
prior to the close of business on the Redemption Date, subject to payment of 
the above amount as aforesaid.  The Trustee shall hold and pay to the Holders 
whose Debentures are selected for redemption any such amount paid to it for 
purchase and conversion in the same manner as it would moneys deposited with it 
by the Company for the redemption of Debentures.  Without the Trustee's prior 
written consent, no arrangement between the Company and such purchasers for the 
purchase and conversion of any Debentures shall increase or otherwise affect any
of the powers, duties, responsibilities or obligations of the Trustee as set 
forth in this Indenture, and the Company agrees to indemnify the Trustee from, 
and hold it harmless against, any loss, liability or expense arising out of or
in connection with any such arrangement for the purchase and conversion of any
Debentures between the Company and such purchasers, including the costs and
expenses incurred by the Trustee in the defense of any claim or liability
arising out of or in connection with the exercise or performance of any of its
powers, duties, responsibilities or obligations under this Indenture.

                                      ARTICLE IV

                             SUBORDINATION OF DEBENTURES

         Section 4.1  DEBENTURES SUBORDINATE TO SENIOR INDEBTEDNESS.  The
Company covenants and agrees, and each Holder of a Debenture, by such Holder's
acceptance thereof, likewise covenants and agrees, that, to the extent and in
the manner hereinafter set forth in this Article IV, the indebtedness
represented by the Debentures and the payment of the principal, Redemption
Price, Repurchase Price and interest, if any, in respect of each and all of the
Debentures are hereby expressly made subordinate and subject in right of payment
to the prior payment in full of all Senior Indebtedness.

         No provision of this Article IV shall prevent the occurrence of any
Default or Event of Default hereunder.

         Section 4.2  PAYMENT OVER OF PROCEEDS UPON DISSOLUTION.  Upon any
distribution of assets of the Company in the event of (a) any insolvency or
bankruptcy case or proceeding, or any receivership, liquidation, reorganization
or other similar case or proceeding in connection therewith, relative to the
Company or to its creditors, as such, or to its assets, or (b) any liquidation,
dissolution or other winding up of the Company, whether voluntary or involuntary
and whether or not involving insolvency or bankruptcy, or (c) any assignment for
the benefit of creditors or any other marshalling of assets and liabilities of
the Company, then and in any such event the Holders of Senior Indebtedness shall
be entitled to receive payment in full of all amounts due or to become due on or
in respect of all Senior Indebtedness, or


                                          16

<PAGE>

provision shall be made for such payment in money or money's worth, before the
holders of the Debentures are entitled to receive any payment of the principal
of, premium, if any, and interest on all Debentures (including, but not limited
to, the Redemption Price with respect to Debentures called for redemption in
accordance with Section 3.2 or the Repurchase Price of Debentures submitted for
repurchase in accordance with Section 15.2) and to that end the holders of
Senior Indebtedness shall be entitled to receive, for application to the payment
thereof, any payment or distribution of any kind or character, whether in cash,
property or securities, which may be payable or deliverable in respect of the
Debentures in any such case, proceeding, dissolution, liquidation or other
winding up  or event, including any such payment or distribution which may be
payable or deliverable by reason of the payment of any other indebtedness of the
Company being subordinated to the payment of the Debentures.

         In the event that, notwithstanding the foregoing provisions of this
Section 4.2, the Trustee or the holder of any Debenture shall have received any
payment or distribution of assets of the Company of any kind or character,
whether in cash, property or securities, including any such payment or
distribution which may be payable or deliverable by reason of the payment of any
other indebtedness of the Company being subordinated to the payment of the
Debentures, before all Senior Indebtedness is paid in full or payment thereof
provided for, and if such fact shall, at or prior to the time of such payment or
distribution, have been made known to the Trustee or, as the case may be, such
holder, then in such event such payment or distribution shall be paid over or
delivered forthwith to the trustee in bankruptcy, receiver, liquidating trustee,
custodian, assignee, agent or other Person making payment or distribution of
assets of the Company for application to the payment of all Senior Indebtedness
remaining unpaid, to the extent necessary to pay all Senior Indebtedness in
full, after giving effect to any concurrent payment or distribution to or for
the holders of Senior Indebtedness.

         The consolidation of the Company with, or the merger of the Company
into, another person or the liquidation or dissolution of the Company following
the conveyance or transfer of its properties and assets substantially as an
entirety to another person upon the terms and conditions set forth in Article XI
shall not be deemed a dissolution, winding up, liquidation, reorganization,
assignment for the benefit of creditors or marshalling of assets and liabilities
of the Company for the purposes of this Section 4.2 if the person formed by such
consolidation or into which the Company is merged or the person which acquires
by conveyance or transfer such properties and assets substantially as an
entirety, as the case may be, shall as part of such consolidation, merger,
conveyance or transfer, comply with the conditions set forth in Article XI.



                                          17

<PAGE>

         Section 4.3  PRIOR PAYMENT OF SENIOR INDEBTEDNESS UPON ACCELERATION OF
DEBENTURES.  In the event that any Debentures are declared due and payable
before their stated maturity, then and in such event the holders of Senior
Indebtedness outstanding at the time such Debentures so become due and payable
shall be entitled to receive payment in full of all amounts due or to become due
on or in respect of all Senior Indebtedness, or provision shall be made for such
payment in money or money's worth, before the Holders of the Debentures are
entitled to receive any payment (including any payment which may be payable by
reason of the payment of any other indebtedness of the Company being
subordinated to the payment of the Debentures) by the Company of the principal
of, premium, if any, and interest on all Debentures (including, but not limited
to, the Redemption Price with respect to the Debentures called for redemption in
accordance with Section 3.2 or the Repurchase Price of any Debentures submitted
for repurchase in accordance with Section 15.2 or on account of the purchase or
other acquisition of Debentures).

         In the event that, notwithstanding the foregoing, the Company shall
make any payment to the Trustee or the holder of any Debenture prohibited by the
foregoing provisions of this Section, and if such fact shall, at or prior to the
time of such payment, have been made known to the Trustee or, as the case may
be, such holder, then and in such event such payment shall be paid over and
delivered forthwith to the Company.

         The provisions of this Section shall not apply to any payment with
respect to which Section 4.2 would be applicable.

         Section 4.4  NO PAYMENT WHEN SENIOR INDEBTEDNESS IN DEFAULT.  In the
event and during the continuation of any default in the payment of principal of
(or premium, if any) or interest on any Senior Indebtedness beyond any
applicable grace period with respect thereto, or in the event that any event of
default with respect to any Senior Indebtedness shall have occurred and be
continuing, permitting the holders of such Senior Indebtedness (or a trustee on
behalf of the holders thereof) to declare such Senior Indebtedness due and
payable prior to the date on which it would otherwise have become due and
payable (a "SENIOR INDEBTEDNESS DEFAULT"), unless and until such Senior
Indebtedness Default shall have been cured or waived or shall have ceased to
exist and such acceleration shall have been rescinded or annulled, or in the
event any judicial proceeding shall be pending with respect to any such Default,
then no payment (including any payment which may be payable by reason of the
payment of any other indebtedness of the Company being subordinated to the
payment of the Debentures) of principal of, premium, if any, and interest on all
Debentures (including, but not limited to, the Redemption Price with respect to
the Debentures called for redemption in accordance with Section 3.2 or the
Repurchase Price of any Debentures submitted for repurchase in accordance with
Section 15.2 or on


                                          18

<PAGE>

account of the purchase or other acquisition of Debentures shall be made, nor
may the Company pay cash with respect to the purchase price or upon conversion
of any Debentures (other than cash in lieu of fractional shares).

         In the event that, notwithstanding the foregoing, the Company shall
make any payment to the Trustee or the holder of any Debentures prohibited by
the foregoing provisions of this Section 4.4, and if such fact shall then have
been made known to the Trustee or, as the case may be, such Holder, then and in
such event such payment shall be paid over and delivered forthwith to the 
Company.

         The provisions of this Section shall not apply to any payment with
respect to which Section 4.2 would be applicable.

         Section 4.5  PAYMENT PERMITTED IF NO DEFAULT.  Nothing contained in
this Article or elsewhere in this Indenture or in any of the Debentures shall
prevent (a) the Company, at any time except during the pendency of any case,
proceeding, dissolution, liquidation or other winding up, assignment for the
benefit of creditors or other marshalling of assets and liabilities of the
Company referred to in Section 4.2 or under the conditions described in Section
4.3 or 4.4, from making payments at any time of principal of, premium, if any,
and interest on all Debentures (including, but not limited to, the Redemption
Price with respect to the Debentures called for redemption in accordance with
Section 3.2 or the Repurchase Price with respect to Debentures submitted for
repurchase in accordance with Section 15.2) or (b) the application by the
Trustee of any money deposited with it hereunder to the payment of or on account
of the principal of, premium, if any, and interest on all Debentures (including,
but not limited to, the Redemption Price with respect to the Debentures called
for redemption in accordance with Section 3.2 or the Repurchase Price with
respect to Debentures submitted for repurchase in accordance with Section 15.2),
or the retention of such payment by the Holders of the Debentures, if, at the
time of such application by the Trustee, the Trustee did not have actual
knowledge that such payment would have been prohibited by the provisions of this
Article IV.

         Section 4.6  SUBROGATION TO RIGHTS OF HOLDERS OF SENIOR INDEBTEDNESS.
Subject to payment in full of all Senior Indebtedness, the holders of the
Debentures shall be subrogated to the extent of the payments or distributions
made to the holders of such Senior Indebtedness pursuant to the provisions of
this Article IV (equally and ratably with the holders of all indebtedness of the
Company which by its express terms is subordinated to indebtedness of the
Company to substantially the same extent as the Debentures are subordinated and
is entitled to like rights of subrogation) to the rights of the holders of such
Senior Indebtedness to receive payments or distributions of cash, property and


                                          19

<PAGE>

securities applicable to the Senior Indebtedness until the principal of,
premium, if any, and interest on all Debentures (including, but not limited to,
the Redemption Price with respect to the Debentures called for redemption in
accordance with Section 3.2 or the Repurchase Price with respect to Debentures
submitted for repurchase in accordance with Section 15.2), shall be paid in
full.  For purposes of such subrogation, no payments or distributions to the
holders of the Senior Indebtedness of any cash, property or securities to which
the holders of the Debentures or the Trustee would be entitled except for the
provisions of this Article, and no payments over pursuant to the provisions of
this Article to the holders of Senior Indebtedness by holders of the Debentures
or the Trustee, shall, as among the Company, its creditors other than holders of
Senior Indebtedness and the Holders of the Debentures, be deemed to be a payment
or distribution by the Company to or of the Senior Indebtedness.  

          Section 4.7  PROVISIONS SOLELY TO DEFINE RELATIVE RIGHTS.  The provi-
sions of this Article are and are intended solely for the purpose of defining
the relative rights of the holders of the Debentures, on the one hand, and the
holders of Senior Indebtedness, on the other hand.  Nothing contained in this
Article or elsewhere in this Indenture or in the Debentures is intended to or
shall (a) impair, as among the Company, its creditors other than holders of
Senior Indebtedness and the Holders of the Debentures, the obligation of the
Company, which is absolute and unconditional (and which, subject to the rights
under this Article of the holders of Senior Indebtedness, is intended to rank
equally with all other general obligations of the Company), to pay to the
holders of the Debentures the principal of, premium, if any, and interest on all
Debentures (including, but not limited to, the Redemption Price with respect to
the Debentures called for redemption in accordance with Section 3.2 or the
Repurchase Price with respect to Debentures submitted for repurchase in
accordance with Section 15.2) as and when the same shall become due and payable
in accordance with the terms of the Debentures and this Indenture; or (b) affect
the relative rights against the Company of the holders of the Debentures and
creditors of the Company other than the holders of Senior Indebtedness; or (c)
prevent the Trustee or the holder of any Debenture from exercising all remedies
otherwise permitted by applicable law upon Default under this Indenture, subject
to the rights, if any, under this Article of the holders of Senior Indebtedness
to receive cash, property and securities otherwise payable or deliverable to the
Trustee or such holder.

          Section 4.8  TRUSTEE TO EFFECTUATE SUBORDINATION.  Each holder of a
Debenture by such holder's acceptance thereof authorizes and directs the 
Trustee on such holder's behalf to take such action as may be necessary or 
appropriate to effectuate the subordination provided in this Article and 
appoints the Trustee his attorney-in-fact for any and all such purposes.  


                                       20

<PAGE>

          Section 4.9  NO WAIVER OF SUBORDINATION PROVISIONS.  No right of any
present or future holder of any Senior Indebtedness to enforce subordination as
herein provided shall at any time in any way be prejudiced or impaired by any
act or failure to act on the part of the Company or by any act or failure to
act, in good faith, by any such holder, or by any non-compliance by the Company
with the terms, provisions and covenants of this Indenture, regardless of any
knowledge thereof any such holder may have or be otherwise charged with.

          Without in any way limiting the generality of the foregoing paragraph,
the holders of Senior Indebtedness may, at any time and from time to time,
without the consent of or notice to the Trustee or the holders of the
Debentures, without incurring responsibility to the holders of the Debentures
and without impairing or releasing the subordination provided in this Article or
the obligations hereunder of the holders of the Debentures to the holders of
Senior Indebtedness, do any one or more of the following:  (i) change the
manner, place or terms of payment or extend the time of payment of, or renew or
alter, Senior Indebtedness, or otherwise amend or supplement in any manner
Senior Indebtedness or any instrument evidencing the same or any agreement under
which Senior Indebtedness is outstanding; (ii) sell, exchange, release or
otherwise deal with any property pledged, mortgaged or otherwise securing Senior
Indebtedness; (iii) release any Person liable in any manner for the collection
of Senior Indebtedness; and (iv) exercise or refrain from exercising any rights
against the Company and any other Person.

          Section 4.10  NOTICE TO TRUSTEE.  The Company shall give prompt
written notice to the Trustee of any fact known to the Company which would
prohibit the making of any payment to or by the Trustee in respect of the
Debentures.  Notwithstanding the provisions of this Article or any other
provision of this Indenture, the Trustee shall not be charged with knowledge of
the existence of any facts which would prohibit the making of any payment to or
by the Trustee in respect of the Debentures, unless and until the Trustee shall
have received written notice therefor from the Company or a holder of Senior
Indebtedness or from any trustee thereof; and, prior to the receipt of any such
written notice, the Trustee, subject to the provisions of Section 6.1, shall be
entitled in all respects to assume that no such facts exist.  

          Subject to the provision of Section 7.1, the Trustee shall be entitled
to rely on the delivery to it of a written notice by a Person representing
himself to be a holder of Senior Indebtedness (or a trustee therefor) to
establish that such notice has been given by a holder of Senior Indebtedness (or
a trustee therefor).  In the event that the Trustee determines in good faith
that further evidence required with respect to the right of any Person as a
holder of Senior Indebtedness to partic-


                                       21
<PAGE>

ipate in any payment or distribution pursuant to this Article, the Trustee may
request such Person to furnish evidence to the reasonable satisfaction of the
Trustee as to the amount of Senior Indebtedness held by such Person, the extent
to which such Person is entitled to participate in such payment or distribution
and any other facts pertinent to the rights of such Person under this Article,
and if such evidence is not furnished, the Trustee may defer any payment to such
Person pending judicial determination as to the right of such Person to receive
such payment.

          Section 4.11  RELIANCE ON JUDICIAL ORDER OR CERTIFICATE OF LIQUIDATING
AGENT.  Upon payment or distribution of assets of the Company referred to in
this Article, the Trustee, subject to the provisions of Section 7.1, and the
holders of the Debentures shall be entitled to rely conclusively upon any order
or decree entered by any court of competent jurisdiction in which such 
insolvency, bank-ruptcy, receivership, liquidation, reorganization, dissolution,
winding up or similar case or proceeding is pending, or a certificate of the
trustee in bankruptcy, liquidating trustee, custodian, receiver, assignee for
the benefit of creditors, agent or other Person making such payment or
distribution, delivered to the Trustee or to the holders of Debentures, for the
purpose of ascertaining the Persons entitled to participate in such payment or
distribution, the holders of the Senior Indebtedness and other indebtedness of
the Company, the amount thereof or payable thereon, the amount or amounts paid
or distributed thereon and all other facts pertinent thereto or to this Article.

          Section 4.12  TRUSTEE NOT FIDUCIARY FOR HOLDERS OF SENIOR
INDEBTEDNESS.  The Trustee shall not be deemed to owe any fiduciary duty to the
holders of Senior Indebtedness and shall not be liable to any such holders if it
shall in good faith mistakenly pay over or distribute to holders of Debentures
or to the Company or to any other person cash, property or securities to which
any holders of Senior Indebtedness shall be entitled by virtue of this Article
or otherwise.

          Section 4.13  RIGHTS OF TRUSTEE AS HOLDER OF SENIOR INDEBTEDNESS;
PRESERVATION OF TRUSTEE'S RIGHTS.  The Trustee in its individual capacity shall
be entitled to all the rights set forth in this Article with respect to any
Senior Indebtedness which may at any time be held by it, to the same extent as
any other holder of Senior Indebtedness, and nothing in this Indenture shall
deprive the Trustee of any of its rights as such holder.

          Nothing in this Article shall apply to claims of, or payments to, the
Trustee under or pursuant to Section 7.7.

          Section 4.14  ARTICLE APPLICABLE TO PAYING AGENTS.  In case at any
time any Paying Agent other than the Trustee shall have been appointed by the
Company and be then acting hereunder,


                                       22
<PAGE>

the term "Trustee" as used in this Article shall in such case (unless the
context otherwise requires) be construed as extending to and including such
Paying Agent within its meaning as fully for all intents and purposes as if such
Paying Agent were named in this Article in addition to or in place of the
Trustee; PROVIDED, HOWEVER, that Sections 4.10 and 4.12 shall not apply to the
Company or any Affiliate of the Company if it or such Affiliate acts as Paying
Agent.

          Section 4.15  CERTAIN CONVERSIONS DEEMED PAYMENT.  For the purposes of
this Article only, (1) the issuance and delivery of junior securities upon
conversion of Debentures in accordance with Article XV shall not be deemed to
constitute a payment or distribution on account of the principal of, premium, if
any, and interest on all Debentures (including, but not limited to, the
redemption price with respect to the Debentures called for redemption in
accordance with Section 3.2 or submitted for repurchase in accordance with
Section 15.2) or on account of the purchase or other acquisition of Debentures,
and (2) the payment, issuance or delivery of cash, property or securities (other
than junior securities) upon conversion of a Debenture shall be deemed to
constitute payment on account of principal of such Debenture.  For the purposes
of this Section, the term "JUNIOR SECURITIES" means (a) shares of any stock of
any class of the Company and (b) securities of the Company which are
subordinated in right of payment to all Senior Indebtedness which may be
outstanding at the time of issuance or delivery of such securities to the same
extent as, or to a greater extent than, the Debentures are so subordinated as
provided in this Article.  Nothing contained in this Article or elsewhere in
this Indenture or in the Debentures is intended to or shall impair, as among the
Company, its creditors other than holders of Senior Indebtedness and the holders
of the Debentures, the right, which is absolute and unconditional, of the holder
of any Debenture to convert such Debenture in accordance with Article XV.  

                                    ARTICLE V

                       PARTICULAR COVENANTS OF THE COMPANY

          Section 5.1  PAYMENT OF PRINCIPAL, PREMIUM AND INTEREST.  The Company
covenants and agrees that it will duly and punctually pay or cause to be paid
the principal of and premium, if any, and interest on each of the Debentures at
the places, at the respective times and in the manner provided herein and in the
Debentures.  Each installment of interest on the Debentures due on any semi-
annual interest payment date may be paid by mailing checks for the interest
payable to or upon the written order of the holders of Debentures entitled
thereto as they shall appear on the Debenture register.


                                       23

<PAGE>

          Section 5.2  MAINTENANCE OF OFFICE OR AGENCY.  The Company will 
maintain in The City of New York, an office or agency where the Debentures 
may be surrendered for registration of transfer or exchange or for 
presentation for payment or for conversion or redemption and where notices 
and deeds to or upon the Company in respect of the Debentures and this 
Indenture may be served.  The Company will give prompt written notice to the 
Trustee of the location, and any change in the location, of such office or 
agency not designated or appointed by the Trustee.  If at any time the 
Company shall fail to maintain any such required office or agency or shall 
fail to furnish the Trustee with the address thereof, such presentations 
surrenders, notices and demands may be made or served at the Corporate Trust 
Office or the office or agency of the Trustee in The City of New York.

          The Company may also from time to time designate one or more other 
offices or agencies where the Debentures may be presented or surrendered for 
any or all such purposes and may from time to time rescind such designations; 
PROVIDED that no such designation or rescission shall in any manner relieve 
the Company of its obligation to maintain an office or agency in The City of 
New York, for such purposes.  The Company will give prompt written notice to 
the holders of any such designation or rescission and of any change in the 
location of any such other office or agency.

          The Company hereby initially designates the Corporate Trust Office of
the Trustee and the office or agency of the Trustee in the Borough of Brooklyn,
The City of New York (which shall initially be The Chase Manhattan Bank, N.A.
located at 4 Chase MetroTech Center, Brooklyn, New York 11245, as an office or
agency of the Company for each of the aforesaid purposes.

          Section 5.3  APPOINTMENTS TO FILL VACANCIES IN TRUSTEE'S OFFICE.  The
Company, whenever necessary to avoid or fill a vacancy in the office of Trustee,
will appoint, in the manner provided in Section 7.8, a successor Trustee, so
that there shall at all times be a Trustee qualified and acting hereunder.

          Section 5.4  CORPORATE EXISTENCE.  Subject to Article XI, the Company
will do or cause to be done all things necessary to preserve and keep in full
force and effect its corporate existence.

          Section 5.5  STAY, EXTENSION AND USURY LAWS.  The Company covenants
(to the extent that it may lawfully do so) that it shall not at any time insist
upon, plead, or in any manner whatsoever claim or take the benefit or advantage
of, any stay, extension or usury law or other law which would prohibit or
forgive the Company from paying all or any portion of the princi-


                                       24
<PAGE>

pal of or interest on the Debentures as contemplated herein, wherever enacted,
now or at any time hereafter in force, or which may affect the covenants or the
performance of this Indenture and the Company (to the extent it may lawfully do
so) hereby expressly waives all benefit or advantage of any such law, and
covenants that it will not, by resort to any such law, hinder, delay or impede
the execution of any power herein granted to the Trustee, but will suffer and
permit the execution of every such power as though no such law has been enacted.

          Section 5.6  COMPLIANCE CERTIFICATE.  The Company shall deliver to the
Trustee within 120 days after the end of each fiscal year of the Company
(beginning with the fiscal year ending closest to December 31, 1996) an
Officers' Certificate stating whether or not the signers know of any Default
that occurred during such period.  If they do, such Officers' Certificate shall
describe the Default and its status.

          Section 5.7  SEC REPORTS.  The Company shall file with the Trustee,
within 15 days after it files such annual and quarterly reports, information,
documents and other reports with the Commission, copies of its annual and
quarterly reports and of the information, documents and other reports (or copies
of such portions of any of the foregoing as the Commission may by rules and
regulations prescribe) which the Company is required to file with the Commission
pursuant to Section 13 or 15(d) of the Exchange Act (or any such successor
provisions thereto).  In the event the Company is at any time no longer subject
to the reporting requirements of Section 13 or 15(d) of the Exchange Act (or any
such successor provisions), it shall continue to provide the Trustee with
reports containing substantially the same information as would have been
required to be filed with the Commission had the Company continued to have been
subject to such reporting requirements, and the Trustee shall make any such
reports available to Debentureholders upon request.  In such event, such reports
shall be provided at the times the Company would have been required to provide
reports had it continued to have been subject to such reporting requirements. 
The Company also shall comply with the other provisions of Trust Indenture Act
Section 314(a).

                                   ARTICLE VI

                              DEFAULTS AND REMEDIES

          Section 6.1  EVENTS OF DEFAULT.  In case one or more of the following
Events of Default (whatever the reason for such Event of Default and whether it
shall be voluntary or involuntary or be effected by operation of law or pursuant
to any judgment, decree or order of any court or any order, rule or regulation
of any administrative or governmental body) shall have occurred and be
continuing:


                                       25
<PAGE>

               (a)  default in the payment of any installment of interest upon
          any of the Debentures as and when the same shall become due and
          payable, and continuance of such default for a period of thirty (30)
          days, whether or not such payment is permitted under Article IV
          hereof; or

               (b)  default in the payment of the principal of or premium, if
          any, on any of the Debentures as and when the same shall become due
          and payable either at maturity or in connection with any redemption
          pursuant to Article III or repurchase pursuant to Article XV, by
          acceleration or otherwise, whether or not such payment is permitted
          under Article IV hereof; or

               (c)  failure on the part of the Company duly to observe or
          perform any other of the covenants or agreements on the part of the
          Company in the Debentures or in this Indenture (other than a covenant
          or agreement a default in whose performance or whose breach is else-
          where in this Section 6.1 specifically dealt with) continued for a
          period of sixty (60) days after the date on which written notice of
          such failure, requiring the Company to remedy the same, shall have
          been given to the Company by the Trustee, or to the Company and the
          Trustee by the holders of at least 25 percent in aggregate principal
          amount of the Debentures at the time outstanding; or

               (d)  failure on the part of the Company to make any payment at
          maturity, including any applicable grace period, in respect of
          indebtedness for borrowed money of the Company, which payment is in an
          amount in excess of $30 million, and continuance of such failure 
          within a period of thirty (30) days after the date on which the 
          written notice of such failure shall have been given to the Company 
          by the Trustee, or to the Company and the Trustee by the holders of 
          at least 25 percent in aggregate principal amount of the Debentures 
          at the time outstanding; or

               (e)  default by the Company with respect to any indebtedness for
          borrowed money of the Company, which default results in acceleration
          of any such indebtedness which is in an amount of in excess of $30
          million without such indebtedness having been discharged, or there 
          having been deposited in trust a sum of money sufficient to discharge 
          in full such indebtedness, or such acceleration having been rescinded 
          or annulled within thirty (30) days after the date on which
          the written notice of such default shall have been given to the
          Company by the Trustee, or to the Company


                                       26
<PAGE>

          and the Trustee by the holders of at least 25 percent in aggregate
          principal amount of the Debentures at the time outstanding; or

               (f)  the Company shall commence a voluntary case or other
          proceeding seeking liquidation, reorganization or other relief with
          respect to itself or its debts under any bankruptcy, insolvency or
          other similar law now or hereafter in effect or seeking the
          appointment of a trustee, receiver, liquidator, custodian or other
          similar official of it or any substantial part of its property, or
          shall consent to any such relief or to the appointment of or taking
          possession by any such official in an involuntary case or other
          proceeding commenced against it, or shall make a general assignment
          for the benefit of creditors, or shall fail generally to pay its debts
          as they become due; or

               (g)  an involuntary case or other proceeding shall be commenced
          against the Company seeking liquidation, reorganization or other
          relief with respect to it or its debts under any bankruptcy,
          insolvency or other similar law now or hereafter in effect or seeking
          the appointment of a trustee, receiver, liquidator, custodian or other
          similar official of it or any substantial part of its property, and
          such involuntary case or other proceeding shall remain undismissed and
          unstayed for a period of ninety (90) consecutive days;

then, and in each and every such case (other than an Event of Default specified
in Section 6.1(f) or (g)), unless the principal of all of the Debentures shall
have already become due and payable, either the Trustee or the holders of not
less than 25 percent in aggregate principal amount of the Debentures then
outstanding hereunder, by notice in writing to the Company (and to the Trustee
if given by Debentureholders), may declare the principal of all the Debentures
and the interest accrued thereon to be due and payable immediately, and upon any
such declaration the same shall become and shall be immediately due and payable,
anything in this Indenture or in the Debentures contained to the contrary
notwithstanding.  If an Event of Default specified in Section 6.1(f) or (g)
occurs, the principal of all the Debentures and the interest accrued thereon
shall be immediately and automatically due and payable without any further
action on the part of the Company, the Trustee or the holders of the Debentures.
This provision, however, is subject to the condition that if, at any time after
the principal of the Debentures shall have been so declared due and payable, and
before any judgment or decree for the payment of the monies due shall have been
obtained or entered as hereinafter provided, the Company shall pay or shall
deposit with the Trustee a sum sufficient to pay all matured installments


                                       27
<PAGE>

of interest upon all Debentures and the principal of and premium, if any, on any
and all Debentures which shall have become due otherwise than by acceleration
(with interest on overdue installments of interest (to the extent that payments
of such interest is enforceable under applicable law) and on such principal and
premium, if any, at the rate borne by the Debentures, to the date of such
payment or deposit) and amounts due to the Trustee pursuant to Section 7.7, and
if any and all Defaults under this Indenture, other than the nonpayment of
principal of and premium, if any, and accrued interest on Debentures which shall
have become due by acceleration, shall have been cured or waived pursuant to
Section 6.7, then the holders of a majority in aggregate principal amount of the
Debentures then outstanding, by written notice to the Company and to the
Trustee, may waive all Defaults or Events of Default and rescind and annul such
declaration and its consequences; but no such waiver or rescission and annulment
shall extend to or shall affect any subsequent Default or Event of Default, or
shall impair any right consequent thereon.  The Company shall notify the Trustee
in writing promptly upon becoming aware of any Default or Event of Default.

          In case the Trustee shall have proceeded to enforce any right under
this Indenture and such proceedings shall have been discontinued or abandoned
because of such waiver or rescission and annulment or for any other reason or
shall have been determined adversely to the Trustee, then the Company, the
holders of Debentures, and the Trustee shall continue as though no such
proceeding had been taken.

          Section 6.2  PAYMENTS OF DEBENTURES ON DEFAULT; SUIT THEREFOR.  The
Company covenants that (a) if the Company defaults in the payment of any
installment of interest upon any of the Debentures as and when the same shall
become due and payable, and such Default shall have continued for a period of
thirty (30) days, or (b) the Company Defaults pursuant to Section 6.1(b) then,
upon demand of the Trustee, the Company will pay to the Trustee, for the benefit
of the holders of the Debentures, the whole amount that then shall have become
due and payable on all such Debentures for principal and premium, if any, or
interest, or both, as the case may be, with interest upon the overdue principal
and premium, if any, and (to the extent that payment of such interest is
enforceable under applicable law) upon the overdue installments of interest at
the rate borne by the Debentures; and, in addition thereto, such further amount
as shall be sufficient to cover the costs and expenses of collection, including
reasonable compensation to the Trustee, its agents, attorneys and counsel, and
any expenses or liabilities incurred by the Trustee hereunder other than through
its negligence or bad faith.  Until such demand by the Trustee, the Company may
pay the principal of and premium, if any, and interest on the Debentures to the
registered holders, whether or not the Debentures are overdue.



                                       28
<PAGE>

          If the Company fails promptly to pay such amounts upon such demand,
the Trustee, in its own name and as trustee of an express trust, shall be
entitled and empowered to institute any actions or proceedings at law or in
equity for the collection of the sums so due and unpaid, and may prosecute any
such action or proceeding to judgment or final decree, and may enforce any such
judgment or final decree against the Company or any other obligor on the
Debentures and collect in the manner provided by law out of the property of the
Company or any other obligor on the Debentures wherever situated the monies
adjudged or decreed to be payable.

          If there shall be pending proceedings for the bankruptcy or for the
reorganization of the Company or any other obligor on the Debentures under
Title 11 of the United States Code, or any other applicable law, or in case a
receiver, assignee or trustee in bankruptcy or reorganization, liquidator,
sequestrator or similar official shall have been appointed for or taken
possession of the Company or such other obligor, the property of the Company or
such other obligor, or in the case of any other judicial proceedings relative to
the Company or such other obligor upon the Debentures, or to the creditors or
property of the Company or such other obligor, the Trustee, irrespective of
whether the principal of the Debentures shall then be due and payable as therein
expressed or by declaration or otherwise and irrespective of whether the Trustee
shall have made any demand pursuant to the provisions of this Section 6.2, shall
be entitled and empowered, by intervention in such proceeding or otherwise, to
file and prove a claim or claims for the whole amount of principal, premium, if
any, and interest owing and unpaid in respect of the Debentures, and, in case of
any judicial proceedings, to file such proofs of claim and other papers or
documents as may be necessary or advisable in order to have the claims of the
Trustee and of the Debentureholders allowed in such judicial proceedings
relative to the Company or any other obligor on the Debentures, its or their
creditors, or its or their property, and to collect and receive any monies or
other property payable or deliverable on any such claims, and to distribute the
same after the deduction of any amounts due the Trustee under Section 7.7.

          All rights of action and of asserting claims under this Indenture, or
under any of the Debentures, may be enforced by the Trustee without the
possession of any of the Debentures, or the production thereof at any trial or
other proceeding relative thereto, and any such suit or proceeding instituted by
the Trustee shall be brought in its own name as trustee of an express trust, and
any recovery of judgment shall, after provision for the payment of the
reasonable compensation, expenses, disbursements and advances of the Trustee,
its agents and counsel, be for the ratable benefit of the holders of the
Debentures.


                                       29


<PAGE>


         In any proceedings brought by the Trustee (and in any proceedings
involving the interpretation of any provision of this Indenture to which the
Trustee shall be a party) the Trustee shall be held to represent all the holders
of the Debentures, and it shall not be necessary to make any holders of the
Debentures parties to any such proceedings.

         Section 6.3  APPLICATION OF MONIES COLLECTED BY TRUSTEE.  Any monies
collected by the Trustee pursuant to this Article VI shall be applied in the
order following, at the date or dates fixed by the Trustee for the distribution
of such monies, upon presentation of the several Debentures, and stamping
thereon the payment, if only partially paid, and upon surrender thereof, if
fully paid:

              First:  To the payment of all amounts due the Trustee under
         Section 7.7;

              Second:  Subject to the provisions of Article IV, if the
         principal of the outstanding Debentures shall not have become due and
         be unpaid, to the payment of interest on the Debentures in default in
         the order of the maturity of the installments of such interest, with
         interest (to the extent that such interest has been collected by the
         Trustee) upon the overdue installments of interest at the rate borne
         by the Debentures, such payments to be made ratably to the persons
         entitled thereto;

              Third:  Subject to the provisions of Article IV, if the principal
         of the outstanding Debentures shall have become due, by declaration or
         otherwise, and be unpaid to the payment of the whole amount then owing
         and unpaid upon the Debentures for principal and premium, if any, and
         interest, with interest on the overdue principal and premium, if any,
         and (to the extent that such interest has been collected by the
         Trustee) upon overdue installments of interest at the rate borne by
         the Debentures; and PROVIDED, that if such monies shall be
         insufficient to pay in full the whole amounts so due and unpaid upon
         the Debentures, then to the payment of such principal and premium, if
         any, and interest without preference or priority of principal and
         premium, if any, over interest, or of interest over principal and
         premium, if any, or of any installment of interest over any other
         installment of interest, or of any Debenture over any other Debenture,
         ratably to the aggregate of such principal and premium, if any, and
         accrued and unpaid interest; and


                                          30

<PAGE>

              Fourth:  Subject to the provisions of Article IV, to the payment
         of the remainder, if any, to the Company or any other person lawfully
         entitled thereto.

         Section 6.4  PROCEEDINGS BY DEBENTUREHOLDER.  No holder of any
Debenture shall have any right to institute any suit, action or proceeding in
equity or at law upon or under or with respect to this Indenture, or for the
appointment of a receiver, trustee, liquidator, custodian or other similar
official, or for any other remedy hereunder, unless such holder previously shall
have given to the Trustee written notice of an Event of Default and of the
continuance thereof, as hereinbefore provided, and unless the holders of not
less than 25 percent in aggregate principal amount of the Debentures then
outstanding shall have made written request upon the Trustee to institute such
action, suit or proceeding in its own name as Trustee hereunder and shall have
offered to the Trustee such reasonable indemnity as it may require against the
costs, expenses and liabilities to be incurred therein or thereby, and the
Trustee for sixty (60) days after its receipt of such notice, request and offer
of indemnity, shall have neglected or refused to institute any such action, suit
or proceeding and no direction inconsistent with such written request shall have
been given to the Trustee pursuant to Section 6.7; no one or more holders of
Debentures shall have any right in any manner whatever to affect, disturb or
prejudice the rights of any other holder of Debentures, or to obtain or seek to
obtain priority over or preference to any other such holder, or to enforce any
right under this Indenture, except in the manner herein provided and for the
equal, ratable and common benefit of all holders of Debentures (except as
otherwise provided herein).  For the protection and enforcement of this Section
6.4, each and every Debentureholder and the Trustee shall be entitled to such
relief as can be given at law or in equity.

         Notwithstanding any other provision of this Indenture and the
Debentures, the right of the holder of any Debenture to receive payment of the
principal of and premium, if any, and interest on such Debenture, on or after
the respective due dates expressed in such Debenture, or to institute suit for
the enforcement of any such payment on or after such respective dates against
the Company shall not be impaired or affected without the consent of such
holder.

         Anything in this Indenture or the Debentures to the contrary
notwithstanding, the holder of any Debenture, without the consent of either the
Trustee or the holder of any other Debenture, in his own behalf and for his own
benefit, may enforce, and may institute and maintain any proceeding suitable to
enforce, his rights of conversion as provided herein.

         Section 6.5  PROCEEDINGS BY TRUSTEE.  In case of an Event of Default
the Trustee may in its discretion proceed to


                                          31

<PAGE>

protect and enforce the rights vested in it by this Indenture by such
appropriate judicial proceedings as the Trustee shall deem most effectual to
protect and enforce any of such rights, either by suit in equity or by action at
law or by proceeding in bankruptcy or otherwise, whether for the specific
enforcement of any covenant or agreement contained in this Indenture or in aid
of the exercise of any power granted in this Indenture, or to enforce any other
legal or equitable right vested in the Trustee by this Indenture or by law.

         Section 6.6  REMEDIES CUMULATIVE AND CONTINUING.  Except as provided
in Section 2.7, all powers and remedies given by this Article VI to the Trustee
or to the Debentureholders shall, to the extent permitted by law, be deemed
cumulative and not exclusive of any thereof or of any other powers and remedies
available to the Trustee or the holders of the Debentures, by judicial
proceedings or otherwise, to enforce the performance or observance of the
covenants and agreements contained in this Indenture, and no delay or omission
of the Trustee or of any holder of the Debentures to exercise any right or power
accruing upon any Default or Event of Default occurring and continuing as
aforesaid shall impair any such right or power, or shall be construed to be a
waiver of any such default or any acquiescence therein; and subject to the
provisions of Section 6.4, every power and remedy given by this Article VI or by
law to the Trustee or to the Debentureholders may be exercised from time to
time, and as often as shall be deemed expedient, by the Trustee or by the
Debentureholders.

         Section 6.7  DIRECTION OF PROCEEDINGS AND WAIVER OF DEFAULTS BY
MAJORITY OF DEBENTUREHOLDERS.  The holders of a majority in aggregate principal
amount of the Debentures at the time outstanding shall have the right to direct
the time, method, and place of conducting any proceeding for any remedy
available to the Trustee or exercising any trust or power conferred on the
Trustee; PROVIDED, HOWEVER, that (a) such direction shall not be in conflict
with any rule of law or with this Indenture, and (b) the Trustee may take any
other action deemed proper by the Trustee which is not inconsistent with such
direction.  The holders of a majority in aggregate principal amount of the
Debentures at the time outstanding may on behalf of the holders of all of the
Debentures waive any past Default or Event of Default hereunder and its
consequences except (i) a Default in the payment of interest or premium, if any,
on, or the principal of, the Debentures, (ii) a failure by the Company to
convert any Debentures into Common Stock, (iii) a Default in the payment of
Redemption Price pursuant to Article III or Repurchase Price pursuant to Article
XV or (iv) a Default in respect of a covenant or provisions hereof which under
Article X cannot be modified or amended without the consent of the holders of
all Debentures then outstanding.  Upon any such waiver the Company, the Trustee
and the holders of the Debentures shall be restored to their former


                                          32

<PAGE>

positions and rights hereunder; but no such waiver shall extend to any
subsequent or other Default or Event of Default or impair any right consequent
thereon.  Whenever any Default or Event of Default hereunder shall have been
waived as permitted by this Section 6.7, said Default or Event of Default shall
for all purposes of the Debentures and this Indenture be deemed to have been
cured and to be not continuing; but no such waiver shall extend to any
subsequent or other Default or Event of Default or impair any right consequent
thereon.

         Section 6.8  UNDERTAKING TO PAY COSTS.  All parties to this Indenture
agree, and each holder of any Debenture by such Holder's acceptance thereof
shall be deemed to have agreed, that any court may, in its discretion, require,
in any suit for the enforcement of any right or remedy under this Indenture, or
in any suit against the Trustee for any action taken or omitted by it as
Trustee, the filing by any party litigant in such suit of an undertaking to pay
the costs of such suit and that such court may in its discretion assess
reasonable costs, including reasonable attorneys' fees, against any party
litigant in such suit, having due regard to the merits and good faith of the
claims or defenses made by such party litigant; PROVIDED that the provisions of
this Section 6.8 (to the extent permitted by law) shall not apply to any suit
instituted by the Trustee, to any suit instituted by any Debentureholder, or
group of Debentureholders, holding in the aggregate more than ten percent in
principal amount of the Debentures at the time outstanding determined in
accordance with Section 8.4, or to any suit instituted by any Debentureholder
for the enforcement of the payment of the principal of or premium, if any, or
interest on any Debenture on or after the due date expressed in such Debenture
or to any suit for the enforcement of the right to convert any Debenture in
accordance with the provisions of Article XIV or to require the Company to
repurchase any Debenture in accordance with Article XV.


                                     ARTICLE VII

                                       TRUSTEE

         Section 7.1  DUTIES OF TRUSTEE.

              (a)  If an Event of Default has occurred and is continuing, the
         Trustee shall exercise the rights and powers vested in it by this
         Indenture and use the same degree of care and skill in its exercise as
         a prudent man would exercise or use under the circumstances in the
         conduct of his own affairs.

              (b)  Except during the continuance of an Event of Default:


                                          33


<PAGE>

              (1)  the Trustee need perform only those duties that are
specifically set forth in this Indenture and no others; and

              (2)  in the absence of bad faith on its part, the Trustee may
conclusively rely, as to the truth of the statements and the correctness of the
opinions expressed therein, upon certificates or opinions furnished to the
Trustee and conforming to the requirements of this Indenture.  However, in the
case of any such certificate or opinions which by any provision hereof are
specifically required to be furnished to the Trustee, the Trustee shall examine
the certificates and opinions to determine whether or not they conform to the
requirements of this Indenture.

              (c)  The Trustee may not be relieved from liability for its own
         negligent action, its own negligent failure to act or its own willful
         misconduct, except that:

              (1)  this paragraph (c) does not limit the effect of paragraph
(b) of this Section 7.1;

              (2)  the Trustee shall not be liable for any error of judgment
made in good faith by a Responsible Officer unless it is proved that the Trustee
was negligent in ascertaining the pertinent facts; and

              (3)  the Trustee shall not be liable with respect to any action
it takes or omits to take in good faith in accordance with a direction received
by it pursuant to Section 6.7.

              (d) Every provision of this Indenture that in any way relates to
         the Trustee is subject to paragraphs (a), (b), (c) and (e) of this
         Section 7.1.

              (e)  The Trustee (and its directors, officers, employees and 
         agents) may refuse to perform any duty or exercise any right or 
         power hereunder or extend or risk its own funds or otherwise
         incur any financial liability unless it receives indemnity
         satisfactory to it against any loss, liability or expense.

              (f)  Money held by the Trustee in trust hereunder need not be
         segregated from other funds except to the extent required by law.  The
         Trustee (acting in any capacity hereunder) shall be under no liability
         for interest on any money received by it hereunder except as the
         Trustee may otherwise have agreed in writing with the Company.


                                          34

<PAGE>

         Section 7.2  RIGHTS OF TRUSTEE.


              (a)  The Trustee may rely on any document believed by it to be
         genuine and to have been signed or presented by the proper person.
         The Trustee need not investigate any fact or matter stated in the
         document.

              (b)  Before the Trustee acts or refrains from acting, it may
         require an Officers' Certificate and an Opinion of Counsel.  The
         Trustee shall not be liable for any action it takes or omits to take
         in good faith in reliance on such Officers' Certificate or Opinion of
         Counsel.

              (c)  The Trustee may act through agents and shall not be
         responsible for the misconduct or negligence of any agent appointed
         with due care.


              (d)  Subject to the provisions of Section 7.1(c), the Trustee
         shall not be liable for any action it takes or omits to take in good
         faith which it believes to be authorized or within its rights or
         powers.

              (e)  The Trustee shall be under no obligation to exercise any of
         the rights or powers vested in it by this Indenture at the request or
         direction of any of the Holders pursuant to this Indenture, unless
         such Holders shall have offered to the Trustee (and its directors, 
         officers, employees and agents) security or indemnity satisfactory to 
         it against the costs, expenses and liabilities which might be
         incurred by it in compliance with such request or direction.

              (f)  The Trustee shall not be bound to make any investigation
         into the facts or matters stated in any resolution, certificate,
         statement, instrument, opinion, report, notice, request, direction,
         consent, order, bond, debenture, note, other evidence of indebtedness
         or other paper or document, but the Trustee, in its discretion, may
         make such further inquiry or investigation into such facts or matters
         as it may see fit, and, if the Trustee shall determine to make such
         further inquiry or investigation, it shall be entitled to examine the
         books, records and premises of the Company, personally or by agent or
         attorney.

         Section 7.3  INDIVIDUAL RIGHTS OF TRUSTEE.  The Trustee in its
individual or any other capacity may become the owner or pledgee of the
Debentures and may otherwise deal with the Company or its Affiliates with the
same rights it would have if it were not Trustee.  Any Paying Agent, Registrar,
Conversion Agent or co-registrar may do the same with like rights.  However, the
Trustee must comply with Sections 7.10 and 7.11.


                                          35

<PAGE>

         Section 7.4  TRUSTEE'S DISCLAIMER.  The Trustee makes no
representation as to the validity or adequacy of this Indenture or the
Debentures, it shall not be accountable for the Company's use of the proceeds
from the Debentures, it shall not be responsible for any statement in the
registration statement for the Debentures under the Securities Act or in the
Indenture or the Debentures (other than its certificate of authentication), or
the determination as to the Persons entitled to receive any notices hereunder.

         Section 7.5  NOTICE OF DEFAULTS.  If a Default occurs and is
continuing and if it is actually known to a Responsible Officer of the Trustee,
the Trustee shall give to each Debentureholder notice of the Default within 90
days after it occurs.  Except in the case of a Default described in Section
6.1(a) or (b), the Trustee may withhold the notice if and so long as a committee
of its Trust Officers in good faith determines that withholding the notice is in
the interests of Debentureholders.

         Section 7.6  REPORTS BY TRUSTEE TO HOLDERS.  Within 60 days after each
June 15 beginning with the June 15 following the date of this Indenture, the
Trustee shall mail to each Debentureholder a brief report dated as of such June
15 that complies with Trust Indenture Act Section 313(a).  The Trustee also
shall comply with Trust Indenture Act Section 313(b).

         A copy of each report at the time of its mailing to Debentureholders
shall be provided to the Company and shall be filed with the Commission and each
stock exchange on which the Debentures are listed.  The Company agrees promptly
to notify the Trustee whenever the Debentures become listed on any stock
exchange and of any delisting thereof.

         Section 7.7  COMPENSATION AND INDEMNITY.  The Company agrees:

              (a)  to pay to the Trustee from time to time such compensation as
         shall have been agreed to in writing between the Company and the
         Trustee for all services rendered by it hereunder (which compensation
         shall not (to the extent permitted by law) be limited by any provision
         of law in regard to the compensation of a trustee of an express
         trust);

              (b)  to reimburse the Trustee upon its request and, if required
         by the Company, submission of reasonable documentation for all
         reasonable expenses, disbursements and advances incurred or made by
         the Trustee in accordance with any provision of this Indenture
         (including the reasonable compensation and the expenses, advances and
         disbursements of its agents and counsel), except any such expense,
         disbursement or advance


                                          36

<PAGE>

         as may be attributable to its negligence or bad faith; and

              (c)  to indemnify each of the Trustee or any predecessor Trustee
         (and its directors, officers, employees and agents) for, and to hold
         it harmless against, any and all loss, liability,
         damage, claim or expense, including taxes (other than taxes based
         upon, measured or determined by the income of the Trustee), incurred
         without negligence or bad faith on its part, arising out of or in
         connection with the acceptance or administration of this trust,
         including the reasonable costs and expenses of defending itself
         against any claim or liability in connection with the exercise or
         performance of any of its powers or duties hereunder.

         The Trustee shall give the Company prompt notice of any claim or
liability for which the Trustee might be entitled to indemnification under
subparagraph (c) of this Section 7.7.  To secure the Company's payment
obligations in this Section 7.7, the Trustee shall have a lien prior to the
Debentures on all money or property held or collected by the Trustee.

         The Company's payment obligations pursuant to this Section 7.7 shall
survive the discharge of this Indenture.  When the Trustee incurs expenses after
the occurrence of a Default specified in Section 7.1(f) or (g), the expenses are
intended to constitute expenses of administration under Federal or State
bankruptcy laws.  The provisions of this Section shall survive the termination
of this Indenture.

         Section 7.8  REPLACEMENT OF TRUSTEE.  The Trustee may resign by so
notifying the Company; PROVIDED, HOWEVER, no such resignation shall be effective
until a successor Trustee has accepted its appointment pursuant to this
Section 7.8.  The Holders of a majority in aggregate principal amount of the
Debentures at the time outstanding may remove the Trustee by so notifying the
Trustee and may appoint a successor Trustee (subject to the consent of the
Company, such consent not to be unreasonably withheld).  The Company shall
remove the Trustee if:

              (1)  the Trustee fails to comply with Section 7.10;

              (2)  the Trustee is adjudged bankrupt or insolvent;

              (3)  a receiver or other public officer takes charge of the
Trustee or its property; or

              (4)  the Trustee otherwise becomes incapable of acting.


                                          37

<PAGE>


         If the Trustee resigns or is removed or if a vacancy exists in the
office of Trustee for any reason, the Company shall promptly appoint, by
resolution of its Board of Directors, a successor Trustee.

         A successor Trustee shall deliver a written acceptance of its
appointment to the retiring Trustee and to the Company.  Thereupon the
resignation or removal of the retiring Trustee shall become effective, and the
successor Trustee shall have all the rights, powers and duties of the Trustee
under this Indenture.  The successor Trustee shall mail a notice of its
succession to Debentureholders.  The retiring Trustee shall promptly transfer
all property held by it as Trustee to the successor Trustee, subject to the lien
provided for in Section 7.7.

         If a successor Trustee does not take office within 30 days after the
retiring Trustee resigns or is removed, the retiring Trustee, the Company or the
Holders of a majority in aggregate principal amount of the Debentures at the
time outstanding may petition any court of competent jurisdiction for the
appointment of a successor Trustee.

         If the Trustee fails to comply with Section 7.10, any 
Debentureholder may petition any court of competent jurisdiction for the 
removal of the Trustee and the appointment of a successor Trustee.

         From and as of the appointment of a successor Trustee, the 
predecessor Trustee shall have no liability for acts or omissions of the 
successor Trustee and the successor Trustee shall be responsible for all fees 
and expenses incurred from and as of the date of such appointment.

         Section 7.9  SUCCESSOR TRUSTEE BY MERGER.  Except as otherwise
provided in Section 7.8(1) or 7.8(4), if the Trustee consolidates with, merges
or converts into, or transfers all or substantially all its corporate trust
business or assets to, another corporation, the resulting, surviving or
transferee corporation without any further act shall be the successor Trustee.

         Section 7.10  ELIGIBILITY; DISQUALIFICATION.  The Trustee shall at all
times satisfy the requirements of Trust Indenture Act Section 310(a)(1).  The
Trustee shall have a combined capital and surplus of at least $100,000,000 as
set forth in its most recent published annual report of condition.  The Trustee
shall comply with Trust Indenture Act Section 310(b), including the optional
provision permitted by the second sentence of Trust Indenture Act
Section 310(b)(9).  In determining whether the Trustee has conflicting interests
as defined in Trust Indenture Act Section 310(b)(1), the provisions contained in
the proviso to Trust Indenture Act Section 310(b)(1) shall be deemed
incorporated herein.

         Section 7.11  PREFERENTIAL COLLECTION OF CLAIMS AGAINST COMPANY.  The
Trustee shall comply with Trust Indenture Act Section 311(a), excluding any
creditor relationship listed in Trust Indenture Act Section 311(b).  A trustee
who has resigned or been


                                          38

<PAGE>

removed shall be subject to Trust Indenture Act Section 311(a) to the extent
indicated therein.


                                     ARTICLE VIII

                           CONCERNING THE DEBENTUREHOLDERS

         Section 8.1  ACTION BY DEBENTUREHOLDERS.  Whenever in this Indenture
it is provided that the holders of a specified percentage in aggregate principal
amount of the Debentures may take any action (including the making of any demand
or request, the giving of any notice, consent or waiver or the taking of any
other action), the fact that at the time of taking any such action, the holders
of such specified percentage have joined therein may be evidenced (a) by any
instrument or any number of instruments of similar tenor executed by
Debentureholders in person or by agent or proxy appointed in writing, or (b) by
the record of the holders of Debentures voting in favor thereof at any meeting
of Debentureholders duly called and held in accordance with the provisions of
Article IX, or (c) by a combination of such instrument or instruments and any
such record of such a meeting of Debentureholders.  Whenever the Company or the
Trustee solicits the taking of any action by the holders of the Debentures, the
Company or the Trustee shall fix in advance of such solicitation, a date as the
record date for determining holders entitled to take such action.  The record
date shall be not more than fifteen (15) days prior to the date of commencement
of solicitation of such action.

         Section 8.2  PROOF OF EXECUTION BY DEBENTUREHOLDERS.  Subject to the
provisions of Sections 7.1, 7.2 and 9.6, proof of the execution of any
instrument by a Debentureholder or his agent or proxy shall be sufficient if
made in accordance with such reasonable rules and regulations as may be
prescribed by the Trustee or in such manner as shall be satisfactory to the
Trustee.  The holding of Debentures shall be proved by the registry of such
Debentures or by a certificate of the Debenture registrar.

         The record of any Debentureholders' meeting shall be proved in the
manner provided in Section 9.6.

         Section 8.3  WHO ARE DEEMED ABSOLUTE OWNERS.  The Company, the
Trustee, any authenticating agent, any Paying Agent, any Conversion Agent and
any Registrar may deem the Person in whose name such Debenture shall be
registered upon the Debenture register to be, and may treat him as, the absolute
owner of such Debenture (whether or not such Debenture shall be overdue and
notwithstanding any notation of ownership or other writing thereon) for the
purpose of receiving payment of or on account of the principal of, premium, if
any, and interest on such Debenture, for conversion of such Debenture and for
all other purpos-


                                          39

<PAGE>


es and neither the Company nor the Trustee nor any Paying Agent nor any
Conversion Agent nor any authenticating agent nor any Registrar shall be
affected by any notice to the contrary.  All such payments so made to any holder
for the time being, or upon his order, shall be valid, and, to the extent of
the sum or sums so paid, effectual to satisfy and discharge the liability for
monies payable upon any such Debenture.

         Section 8.4    REVOCATION OF CONSENTS; FUTURE HOLDERS BOUND.  At any
time prior to (but not after) the evidencing to the Trustee, as provided in
Section 8.1, of the taking of any action by the holders of the percentage in
aggregate principal amount of the Debentures specified in this Indenture in
connection with such action, any holder of a Debenture which is shown by the
evidence to be included in the Debentures the holders of which have consented to
such action may, by filing written notice with the Company or with the Trustee
at its Corporate Trust Office and upon proof of holding as provided in Section
8.2, revoke such action so far as it concerns such Debenture.  Except as
aforesaid, any such action taken by the holder of any Debenture shall be
conclusive and binding upon such holder and upon all future holders and owners
of such Debenture and of any Debentures issued in exchange or substitution
therefor, irrespective of whether any notation in regard thereto is made upon
such Debenture or any Debenture issued in exchange or substitution therefor.

                                      ARTICLE IX

                              DEBENTUREHOLDERS' MEETINGS

         Section 9.1    PURPOSE OF MEETINGS.  A meeting of Debentureholders may
be called at any time and from time to time pursuant to the provisions of this
Article IX for any of the following purposes:

              (a)  to give any notice to the Company or to the Trustee or to
         give any directions to the Trustee permitted under this Indenture, or
         to consent to the waiving of any Default or Event of Default hereunder
         and its consequences, or to take any other action authorized to be
         taken by Debentureholders pursuant to any of the provisions of Article
         VI;

              (b)  to remove the Trustee and nominate a successor trustee
         pursuant to the provisions of Article VII;

              (c)  to consent to the execution of an indenture or indentures
         supplemental hereto pursuant to the provisions of Section 10.2; or


                                          40

<PAGE>

              (d)  to take any other action authorized to be taken by or on
         behalf of the holders of any specified aggregate principal amount of
         the Debentures under any other provision of this Indenture or under
         applicable law.

         Section 9.2    CALL OF MEETINGS BY TRUSTEE.  The Trustee may at any
time call a meeting of Debentureholders to take any action specified in Section
9.1, to be held at such time and at such place as the Trustee shall determine.
Notice of every meeting of the Debentureholders, setting forth the time and the
place of such meeting and in general terms the action proposed to be taken at
such meeting and the establishment of any record date pursuant to Section 8.1,
shall be mailed to holders of Debentures at their addresses as they shall appear
on the Debenture register.  Such notice shall also be mailed to the Company.
Such notices shall be mailed not less than twenty (20) nor more than ninety (90)
days prior to the date fixed for the meeting.

         Any meeting of Debentureholders shall be valid without notice if the
holders of all Debentures then outstanding are present in person or by proxy or
if notice is waived before or after the meeting by the holders of all Debentures
outstanding, and if the Company and the Trustee are either present by duly
authorized representatives or have, before or after the meeting, waived notice.

         Section 9.3    CALL OF MEETINGS BY COMPANY OR DEBENTUREHOLDERS.  In
case at any time the Company, pursuant to a resolution of its Board of
Directors, or the holders of at least ten percent in aggregate principal amount
of the Debentures then outstanding, shall have requested the Trustee to call a
meeting of Debentureholders, by written request setting forth in reasonable
detail the action proposed to be taken at the meeting, and the Trustee shall not
have mailed the notice of such meeting within twenty (20) days after receipt of
such request, then the Company or such Debentureholders may determine the time
and the place at any location for such meeting and may call such meeting to take
any action authorized in Section 9.1, by mailing notice thereof as provided in
Section 9.2.

         Section 9.4    QUALIFICATIONS FOR VOTING.  To be entitled to vote at
any meeting of Debentureholders a Person shall (a) be a holder of one or more
Debentures on the record date pertaining to such meeting or (b) be appointed by
an instrument in writing as proxy by a holder of one or more Debentures.  The
only Persons who shall be entitled to be present or to speak at any meeting of
Debentureholders shall be the Persons entitled to vote at such meeting and their
counsel and any representative of the Trustee and its counsel and any
representatives of the Company and its counsel.


                                          41

<PAGE>

         Section 9.5    REGULATIONS.  Notwithstanding any other provisions of
this Indenture, the Trustee may make such reasonable regulations as it may deem
advisable for any meeting of Debentureholders, in regard to proof of the holding
of Debentures and of the appointment of proxies, and in regard to the
appointment and duties of inspectors of votes, the submission and examination of
proxies, certificates and other evidence of the right to vote, and such other
matters concerning the conduct of the meeting as it shall think fit.

         The Trustee shall, by an instrument in writing, appoint a temporary
chairman of the meeting, unless the meeting shall have been called by the
Company or by Debentureholders as provided in Section 9.3, in which case the
Company or the Debentureholders calling the meeting, as the case may be, shall
in like manner appoint a temporary chairman.  A permanent chairman and a
permanent secretary of the meeting shall be elected by vote of the holders of a
majority in principal amount of the Debentures represented at the meeting and
entitled to vote at the meeting.

         Subject to the provisions of Section 8.4, at any meeting each
Debentureholder or proxyholder shall be entitled to one vote for each $1,000
principal amount of Debentures held or represented by him; PROVIDED, HOWEVER,
that no vote shall be cast or counted at any meeting in respect of any Debenture
challenged as not outstanding and ruled by the chairman of the meeting to be not
outstanding.  The chairman of the meeting shall have no right to vote other than
by virtue of Debentures held by him or instruments in writing as aforesaid duly
designating him as the proxy to vote on behalf of other Debentureholders.  Any
meeting of Debentureholders duly called pursuant to the provisions of Section
9.2 or 9.3 may be adjourned from time to time by the holders of a majority of
the aggregate principal amount of Debentures represented at the meeting, whether
or not constituting a quorum, and the meeting may be held as so adjourned
without further notice.

         Section 9.6    VOTING.  The vote upon any resolution submitted to any
meeting of Debentureholders shall be by written ballot on which shall be
subscribed the signatures of the holders of Debentures or of their
representatives by proxy and the principal amount of the Debentures held or
represented by them.  The permanent chairman of the meeting shall appoint two
inspectors of votes who shall count all votes cast at the meeting for or against
any resolution and who shall make and file with the secretary of the meeting
their verified written reports in duplicate of all votes cast at the meeting.  A
record in duplicate of the proceedings of each meeting of Debentureholders shall
be prepared by the secretary of the meeting and there shall be attached to said
record the original reports of the inspectors of votes on any vote by ballot
taken thereat and affidavits by one


                                          42

<PAGE>

or more persons having knowledge of the facts setting forth a copy of the notice
of the meeting and showing that said notice was mailed as provided in Section
9.2.  The record shall show the principal amount of the Debentures voting in
favor of or against any resolution.  The record shall be signed and verified by
the affidavits of the permanent chairman and secretary of the meeting and one of
the duplicates shall be delivered to the Company and the other to the Trustee to
be preserved by the Trustee, the latter to have attached thereto the ballots
voted at the meeting.

         Any record so signed and verified shall be conclusive evidence of the
matters therein stated.

         Section 9.7    NO DELAY OF RIGHTS BY MEETING.  Nothing in this Article
IX contained shall be deemed or construed to authorize or permit, by reason of
any call of a meeting of Debentureholders or any rights expressly or impliedly
conferred hereunder to make such call, any hindrance or delay in the exercise of
any right or rights conferred upon or reserved to the Trustee or to the
Debentureholders under any of the provisions of this Indenture or of the
Debentures.

                                      ARTICLE X

                               SUPPLEMENTAL INDENTURES

         Section 10.1   SUPPLEMENTAL INDENTURES WITHOUT CONSENT OF
DEBENTUREHOLDERS.  The Company, when authorized by the resolutions of the Board
of Directors, and the Trustee may from time to time and at any time enter into
an indenture or indentures supplemental hereto for one or more of the following
purposes:

              (a)  to make provision with respect to the conversion rights of
         the holders of Debentures pursuant to the requirements of 
         Section 14.6 or the repurchase obligations of the Company pursuant to
         the requirements of Section 15.5;

              (b)  subject to Article IV, to convey, transfer, assign, mortgage
         or pledge to the Trustee as security for the Debentures, any property
         or assets;

              (c)  to evidence the succession of another corporation to the
         Company, or successive successions, and the assumption by the
         successor corporation of the covenants, agreements and obligations of
         the Company pursuant to Article XI;

              (d)  to add to the covenants of the Company such further
         covenants, restrictions or conditions as the Board of Directors and
         the Trustee shall consider to be


                                          43

<PAGE>

         for the benefit of the holders of Debentures, and to make the
         occurrence, or the occurrence and continuance, of a Default in any
         such additional covenants, restrictions or conditions a Default or an
         Event of Default permitting the enforcement of all or any of the
         several remedies provided in this Indenture as herein set forth;
         PROVIDED, HOWEVER, that in respect of any such additional covenant,
         restriction or condition such supplemental indenture may provide for a
         particular period of grace after default (which period may be shorter
         or longer than that allowed in the case of other defaults) or may
         provide for an immediate enforcement upon such default or may limit
         the remedies available to the Trustee upon such default;

              (e)  to cure any ambiguity or to correct or supplement any
         provision contained herein or in any supplemental indenture which may
         be defective or inconsistent with any other provision contained herein
         or in any supplemental indenture, or to make such other provisions in
         regard to matters or questions arising under this Indenture which
         shall not adversely affect the interest of any holder of the
         Debentures; or

              (f)  to evidence and provide for the acceptance of appointment
         hereunder by a successor Trustee with respect to the Debentures.

         The Trustee shall join with the Company in the execution of any such
supplemental indenture, to make any further appropriate agreements and
stipulations which may be therein contained and to accept the conveyance,
transfer and assignment of any property thereunder, but the Trustee shall not be
obligated to, but may in its discretion, enter into any supplemental indenture
which affects the Trustee's own rights, duties or immunities under this
Indenture or otherwise.

         Any supplemental indenture authorized by the provision of this Section
10.1 may be executed by the Company and the Trustee without the consent of the
holders of any of the Debentures at the time outstanding, notwithstanding any of
the provisions of Section 10.2.

         Section 10.2   SUPPLEMENTAL INDENTURES WITH CONSENT OF
DEBENTUREHOLDERS.  With the consent (evidenced as provided in Article XIII) of
the holders of not less than a majority in aggregate principal amount of the
Debentures at the time outstanding, the Company, when authorized by the
resolutions of the Board of Directors, and the Trustee may from time to time and
at any time enter into an indenture or indentures supplemental hereto for the
purpose of adding any provisions to or changing in any manner or eliminating any
of the provisions of this Indenture


                                          44

<PAGE>

or any supplemental indenture or of modifying in any manner the rights of the
holders of the Debentures; PROVIDED, HOWEVER, that no such supplemental
indenture shall (A) (i) extend the fixed maturity of any Debenture, (ii) reduce
the rate or extend the time of payment of interest thereon, (iii) reduce the
principal amount thereof or premium, if any, thereon, or reduce any amount
payable on redemption thereof, (iv) impair the right of any Debentureholder to
institute suit for the payment thereof, (v) make the principal thereof or
interest or premium, if any, thereon payable in any coin or currency other than
cash, (vi) modify the provisions of this Indenture with respect to the
subordination of the Debentures in a manner adverse to the Debentureholders in
any material respect, (vii) change the obligation of the Company to repurchase
any Debenture upon the occurrence of a Change in Control in a manner adverse to
the holder of Debentures, (viii) impair the right to convert the Debentures into
Common Stock subject to the terms set forth herein, including Section 14.6,
without the consent of the holder of each Debenture so affected, or (B) reduce
the aforesaid percentage of Debentures, the holders of which are required to
consent to any such supplemental indenture, without the consent of the holders
of all Debentures then outstanding.

         Upon the request of the Company, accompanied by a copy of the
resolutions of the Board of Directors certified by its Secretary or an Assistant
Secretary authorizing the execution or any such supplemental indenture, and upon
the filing with the Trustee of evidence of the consent of Debentureholders as
aforesaid, the Trustee shall join with the Company in the execution of such
supplemental indenture unless such supplemental indenture affects the Trustee's
own rights, duties or immunities under this Indenture or otherwise, in which
case the Trustee may in its discretion, but shall not be obligated to enter into
such supplemental indenture.

         It shall not be necessary for the consent of the Debentureholders
under this Section 10.2 to approve the particular form of any proposed
supplemental indenture, but it shall be sufficient if such consent shall approve
the substance thereof.

         Section 10.3   EFFECT OF SUPPLEMENTAL INDENTURE.  Any supplemental
indenture executed pursuant to the provisions of this Article X shall comply
with the Trust Indenture Act, as then in effect.  Upon the execution of any
supplemental indenture pursuant to the provisions of this Article X, this
Indenture shall be and be deemed to be modified and amended in accordance
therewith and the respective rights, limitation of rights, obligations, duties
and immunities under this Indenture of the Trustee, the Company and the holders
of Debentures shall thereafter be determined, exercised and enforced hereunder
subject in all respects to such modifications and amendments and all the terms
and conditions of any such supplemental indenture shall be


                                          45

<PAGE>

and be deemed to be part of the terms and conditions of this Indenture for any
and all purposes.

         Section 10.4   NOTATION ON DEBENTURES.  Debentures authenticated and
delivered after the execution of any supplemental indenture pursuant to the
provisions of this Article X may bear a notation in form approved by the Trustee
as to any matter provided for in such supplemental indenture.  If the Company or
the Trustee shall so determine, new Debentures so modified as to conform, in the
opinion of the Trustee and the Board of Directors, to any modification of this
Indenture contained in any such supplemental indenture may, at the Company's
expense, be prepared and executed by the Company, authenticated by the Trustee
(or an authenticating agent duly appointed by the Trustee pursuant to Section
16.11) and delivered in exchange for the Debentures then outstanding, upon
surrender of such Debentures then outstanding.

         Section 10.5   EVIDENCE OF COMPLIANCE OF SUPPLEMENTAL INDENTURE TO 
BE FURNISHED TRUSTEE.  The Trustee, subject to the provisions of Sections 7.1 
and 7.2, shall be entitled to receive an Officers' Certificate and an Opinion 
of Counsel as conclusive evidence that any supplemental indenture executed 
pursuant hereto complies with the requirements of this Article X.

                                      ARTICLE XI

                  CONSOLIDATION, MERGER, SALE, CONVEYANCE AND LEASE

         Section 11.1   COMPANY MAY CONSOLIDATE ETC. ON CERTAIN TERMS.  Subject
to the provisions of Section 11.2, nothing contained in this Indenture or in any
of the Debentures shall prevent any consolidation or merger of the Company with
or into any other corporation or corporations (whether or not affiliated with
the Company), or successive consolidations or mergers in which the Company or
its successor or successors shall be a party or parties, or shall prevent any
sale, conveyance or lease (or successive sales, conveyances or leases) of all or
substantially all of the property of the Company, to any other corporation
(whether or not affiliated with the Company), authorized to acquire and operate
the same and which, in each case, shall be organized under the laws of the
United States of America, any state thereof or the District of Columbia;
PROVIDED, that upon any such consolidation, merger, sale, conveyance or lease,
the due and punctual payment of the principal of and premium, if any, and
interest on all of the Debentures, according to their tenor, and the due and
punctual performance and observance of all of the covenants and conditions of
this Indenture to be performed by the Company, shall be expressly assumed, by
supplemental indenture reasonably satisfactory in form to the Trustee, executed
and delivered to the Trustee by the corporation (if other than the Company)
formed by such consolidation, or into which the Company


                                          46

<PAGE>

shall have been merged, or by the corporation which shall have acquired or
leased such property, and such supplemental indenture shall provide for the
applicable conversion rights set forth in Section 14.6.

         Section 11.2   SUCCESSOR CORPORATION TO BE SUBSTITUTED.  In case of
any such consolidation, merger, sale, conveyance or lease and upon the
assumption by the successor corporation, by supplemental indenture, executed and
delivered to the Trustee and satisfactory in form to the Trustee, of the due and
punctual payment of the principal of and premium, if any, and interest on all of
the Debentures and the due and punctual performance of all of the covenants and
conditions of this Indenture to be performed by the Company, such successor
corporation shall succeed to and be substituted for the Company, with the same
effect as if it had been named herein as the party of the first part.  Such
successor corporation thereupon may cause to be signed, and may issue either in
its own name or in the name of ALZA Corporation any or all of the Debentures
issuable hereunder which theretofore shall not have been signed by the Company
and delivered to the Trustee; and, upon the order of such successor corporation
instead of the Company and subject to all the terms, conditions and limitations
in this Indenture prescribed, the Trustee shall authenticate and shall deliver,
or cause to be authenticated and delivered, any Debentures which previously
shall have been signed and delivered by the officers of the Company to the
Trustee for authentication, and any Debentures which such successor corporation
thereafter shall cause to be signed and delivered to the Trustee for that
purpose.  All the Debentures so issued shall in all respects have the same legal
rank and benefit under this Indenture as the Debentures theretofore or
thereafter issued in accordance with the terms of this Indenture as though all
of such Debentures had been issued at the date of the execution hereof.  In the
event of any such consolidation, merger, sale or conveyance (but not in the
event of any such lease), the person named as the "Company" in the first
paragraph of this Indenture or any successor which shall thereafter have become
such in the manner prescribed in this Article XI may be dissolved, wound up and
liquidated at any time thereafter and such person shall be released from its
liabilities as obligor and maker of the Debentures and from its obligations
under this Indenture.

         In case of any such consolidation, merger, sale, conveyance or lease,
such changes in phraseology and form (but not in substance) may be made in the
Debentures thereafter to be issued as may be appropriate.

         Section 11.3   OPINION OF COUNSEL TO BE GIVEN TRUSTEE.  The Trustee,
subject to Sections 7.1 and 7.2, shall be entitled to receive an Officers'
Certificate and an Opinion of Counsel as conclusive evidence that any such
consolidation, merger, sale,


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<PAGE>

conveyance or lease and any such assumption complies with the provisions of this
Article XI.

                                     ARTICLE XII

                       SATISFACTION AND DISCHARGE OF INDENTURE

         Section 12.1   DISCHARGE OF INDENTURE.  When (a) the Company shall
deliver to the Trustee for cancellation all Debentures theretofore authenticated
(other than any Debentures which have been destroyed, lost or stolen and in lieu
of or in substitution for which other Debentures shall have been authenticated
and delivered) and not theretofore cancelled, or (b) all the Debentures not
theretofore cancelled or delivered to the Trustee for cancellation shall have
become due and payable, or are by their terms to become due and payable within
one year or are to be called for redemption within one year under arrangements
satisfactory to the Trustee for the giving of notice of redemption, and the
Company shall deposit with the Trustee, in trust, funds sufficient to pay at
maturity or upon redemption of all of the Debentures (other than any Debentures
which shall have been mutilated, destroyed, lost or stolen and in lieu of or in
substitution for which other Debentures shall have been authenticated and
delivered) not theretofore canceled or delivered to the Trustee for
cancellation, including principal and premium, if any, and interest due or to
become due to such date of maturity or redemption date, as the case may be, and
if in either case the Company shall also pay or cause to be paid all other sums
payable hereunder by the company, then this Indenture shall cease to be of
further effect (except as to (i) remaining rights of registration of transfer,
substitution and exchange and conversion of Debentures, (ii) rights hereunder of
Debentureholders to receive payments of principal of and premium, if any, and
interest on, the Debentures and the other rights, duties and obligations of
Debentureholders, as beneficiaries hereof with respect to the amounts, if any,
so deposited with the Trustee and (iii) the rights, obligations and immunities
of the Trustee hereunder), and the Trustee, on demand of the Company accompanied
by an Officers' Certificate and an Opinion of Counsel as required by Section
16.5 and at the cost and expense of the Company, shall execute proper
instruments acknowledging satisfaction of and discharging this Indenture; the
Company, however, hereby agreeing to reimburse the Trustee for any costs or
expenses thereafter reasonably and properly incurred by the Trustee and to
compensate the Trustee for any services thereafter reasonably and properly
rendered by the Trustee in connection with this Indenture or the Debentures.

         Section 12.2   DEPOSITED MONIES TO BE HELD IN TRUST BY TRUSTEE.
Subject to Section 12.4, all monies deposited with the Trustee pursuant to
Section 12.1 and not in violation of Article IV shall be held in trust for the
sole benefit of the


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<PAGE>

Debentureholders and not to be subject to the subordination provisions of
Article IV, and such monies shall be applied by the Trustee to the payment,
either directly or through any Paying Agent (including the Company if acting as
its own Paying Agent), to the holders of the particular Debentures for the
payment or redemption of which such monies have been deposited with the Trustee,
of all sums due and to become due thereon for principal and interest and
premium, if any.

         Section 12.3   PAYING AGENT TO REPAY MONIES HELD.  Upon the
satisfaction and discharge of this Indenture, all monies then held by any Paying
Agent (other than the Trustee) shall, upon written request of the Company, be
repaid to the Company or paid to the Trustee, and thereupon such Paying Agent
shall be released from all further liability with respect to such monies.

         Section 12.4   RETURN OF UNCLAIMED MONIES.  Subject to the
requirements of applicable law, any monies deposited with or paid to the Trustee
for payment of the principal of, premium, if any, or interest on Debentures and
not applied but remaining unclaimed by the holders of Debentures for two years
after the date upon which the principal of, premium, if any, or interest on such
Debentures, as the case may be, shall have become due and payable, shall be
repaid to the Company by the Trustee on demand and all liability of the Trustee
shall thereupon cease with respect to such monies; and the holder of any of the
Debentures shall thereafter look only to the Company for any payment which such
holder may be entitled to collect unless an applicable abandoned property law
designates another Person.

         Section 12.5   REINSTATEMENT.  If the Trustee or the Paying Agent is
unable to apply any money in accordance with Section 12.2 by reason of any order
or judgment of any court or governmental authority enjoining, restraining or
otherwise prohibiting such application, the Company's obligations under this
Indenture and the Debentures shall be revived and reinstated as though no
deposit had occurred pursuant to Section 12.1 until such time as the Trustee or
the Paying Agent is permitted to apply all such money in accordance with Section
12.2; PROVIDED, HOWEVER, that if the Company makes any payment of interest on or
principal of any Debenture following the reinstatement of its obligations, the
Company shall be subrogated to the rights of the holders of such Debentures to
receive such payment from the money held by the Trustee or Paying Agent.


                                          49

<PAGE>




                                     ARTICLE XIII

                       IMMUNITY OF INCORPORATORS, STOCKHOLDERS,
                                OFFICERS AND DIRECTORS

         Section 13.1   INDENTURE AND DEBENTURES SOLELY CORPORATE OBLIGATIONS.
No recourse for the payment of the principal of or premium, if any, or interest
on any Debenture, or for any claim based thereon or otherwise in respect
thereof, and no recourse under or upon any obligation, covenant or agreement of
the Company in this Indenture or in any supplemental indenture or in any
Debenture, or because of the creation of any indebtedness represented thereby,
shall be had against any incorporator, stockholder, employee, agent, officer, or
director or subsidiary, as such, past, present or future, of the Company or of
any successor corporation, either directly or through the Company or any
successor corporations, whether by virtue of any constitution, statute or rule
of law, or by the enforcement of any assessment or penalty or otherwise; it
being expressly understood that all such liability is hereby expressly waived
and released as a condition of, and as a consideration for, the execution of
this Indenture and the issue of the Debentures.

                                     ARTICLE XIV

                               CONVERSION OF DEBENTURES

         Section 14.1   RIGHT TO CONVERT.  Subject to and upon compliance with
the provisions of this Indenture, the holder of any Debenture shall have the
right, at such Holder's option, at any time prior to the close of business on
[____], 2006 (except that, with respect to any Debenture or portion of a
Debenture which shall be called for redemption, such right shall terminate,
except as provided in Section 14.2 or Section 3.4, at the close of business on
the Business Day next preceding the date fixed for redemption of such Debenture
or portion of a Debenture unless the Company shall default in payment due upon
redemption thereof) to convert the principal amount of any such Debenture, or
any portion of such principal amount which is $1,000 or an integral multiple
thereof, into that number of fully paid and non-assessable shares of Common
Stock (as such shares shall then be constituted) obtained by dividing the
principal amount of the Debenture or portion thereof surrendered for conversion
by the Conversion Price in effect at such time, by surrender of the Debenture so
to be converted in whole or in part, together with any required funds, in the
manner provided in Section 14.2.  A holder of Debentures is not entitled to any
rights of a holder of Common Stock until such holder has converted his
Debentures to Common Stock, and only to the extent such Debentures are deemed to
have been converted to Common Stock under this Article XIV.

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<PAGE>

         Section 14.2   EXERCISE OF CONVERSION PRIVILEGE; ISSUANCE OF COMMON
STOCK ON CONVERSION; NO ADJUSTMENT FOR INTEREST OR DIVIDENDS.  In order to
exercise the conversion privilege with respect to any Debenture, the holder of
such Debenture shall surrender such Debenture, duly endorsed, at an office or
agency maintained by the Company pursuant to Section 5.2, accompanied by the
funds, if any, required by the penultimate paragraph of this Section 14.2, and
shall give written notice of conversion in the form provided on the Debentures
(or such other notice which is acceptable to the Company) to the office or
agency that the holder elects to convert such Debenture or the portion thereof
specified in said notice.  Such notice shall also state the name or names (with
address or addresses) in which the certificate or certificates for shares of
Common Stock which shall be issuable on such conversion shall be issued, and
shall be accompanied by transfer taxes, if required pursuant to Section 14.7.
Each such Debenture surrendered for conversion shall, unless the shares issuable
on conversion are to be issued in the same name as the registration of such
Debenture, be duly endorsed by, or be accompanied by instruments of transfer in
form satisfactory to the Company duly executed by, the holder or his duly
authorized attorney.

         As promptly as practicable after satisfaction of the requirements for
conversion set forth above, subject to compliance with any restrictions on
transfer if shares issuable on conversion are to be issued in a name other than
that of the Debentureholder (as if such transfer were a transfer of the
Debenture or Debentures (or portion thereof) so converted), the Company shall
issue and shall deliver to such holder at the office or agency maintained by the
Company for such purpose pursuant to Section 5.2, a certificate or certificates
for the number of full shares of Common Stock issuable upon the conversion of
such Debenture or portion thereof in accordance with the provisions of this
Article and a check or cash in respect of any fractional interest in respect of
a share of Common Stock arising upon such conversion, as provided in Section
14.3.  In case any Debenture of a denomination greater than $1,000 shall be
surrendered for partial conversion, and subject to Section 2.3, the Company
shall execute and the Trustee shall authenticate and deliver to the holder of
the Debenture so surrendered, without charge to him, a new Debenture or
Debentures in authorized denominations in an aggregated principal amount equal
to the unconverted portion of the surrendered Debenture.

         Each conversion shall be deemed to have been effected as to any such
Debenture (or portion thereof) on the date on which the requirements set forth
above in this Section 14.2 have been satisfied as to such Debenture (or portion
thereof), and the person in whose name any certificate or certificates for
shares of Common Stock shall be issuable upon such conversion shall be deemed to
have become on said date the holder of record of the

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<PAGE>

shares represented thereby; PROVIDED, HOWEVER, that any such surrender on any
date when the stock transfer books of the Company shall be closed shall
constitute the person in whose name the certificates are to be issued as the
record holder thereof for all purposes on the next succeeding day on which such
stock transfer books are open, but such conversion shall be at the Conversion
Price in effect on the date upon which such Debenture shall be surrendered.

         Any Debenture or portion thereof surrendered for conversion during the
period from the close of business on the record date for any interest payment
date to the close of business on the Business Day next preceding the following
interest payment date shall (unless such Debenture or portion thereof being
converted shall have been called for redemption during the period from the close
of business on such record date to the close of business on the Business Day
next preceding the following interest payment date) be accompanied by payment,
in New York Clearing House funds or other funds acceptable to the Company, of an
amount equal to the interest payable on such interest payment date on the
principal amount being converted; PROVIDED, HOWEVER, that no such payment need
be made if there shall exist at the time of conversion a default in the payment
of interest on the Debentures.  Except as provided above in this Section 14.2,
no adjustment shall be made for interest accrued on any Debenture converted or
for dividends on any shares issued upon the conversion of such Debenture as
provided in this Article.

         Section 14.3   CASH PAYMENTS IN LIEU OF FRACTIONAL SHARES.  No
fractional shares of Common Stock or scrip representing fractional shares shall
be issued upon conversion of Debentures.  If more than one Debenture shall be
surrendered for conversion at one time by the same holder, the number of full
shares which shall be issuable upon conversion shall be computed on the basis of
the aggregate principal amount of the Debentures (or specified portions thereof
to the extent permitted hereby) so surrendered.  If any fractional share of
stock would be issuable upon the conversion of any Debenture or Debentures, the
Company shall make an adjustment and payment therefor in cash at the current
market value thereof to the holder of Debentures.  The current market value of a
share of Common Stock shall be the Closing Price on the first Trading Day
immediately preceding the day on which the Debentures (or specified portions
thereof) are deemed to have been converted.

         Section 14.4   CONVERSION PRICE.  The conversion price shall be as
specified in the form of Debenture (herein called the "Conversion Price")
attached as Exhibit A hereto, subject to adjustment as provided in this Article
XIV.

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<PAGE>

         Section 14.5   ADJUSTMENT OF CONVERSION PRICE.  The Conversion Price
shall be adjusted from time to time by the Company as follows:

              (a)  In case the Company shall hereafter pay a dividend or make a
         distribution to all holders of the outstanding Common Stock in shares
         of Common Stock, the Conversion Price in effect at the opening of
         business on the date following the date fixed for the determination of
         stockholders entitled to receive such dividend or other distribution
         shall be reduced by multiplying such Conversion Price by a fraction of
         which the numerator shall be the number of shares of Common Stock
         outstanding at the close of business on the date fixed for such
         determination and the denominator shall be the sum of such number of
         shares and the total number of shares constituting such dividend or
         other distribution, such reduction to become effective immediately
         after the opening of business on the day following the date fixed for
         such determination.  The Company will not pay any dividend or make any
         distribution on shares of Common Stock held in the treasury of the
         Company.  If any dividend or distribution of the type described in
         this Section 14.5(a) is declared but not so paid or made, the
         Conversion Price shall again be adjusted to the Conversion Price which
         would then be in effect if such dividend or distribution had not been
         declared.

              (b)  In case the Company shall issue rights or warrants to all
         holders of its outstanding shares of Common Stock entitling them (for
         a period expiring within 45 days after the date fixed for
         determination of stockholders entitled to receive such rights or
         warrants) to subscribe for or purchase shares of Common Stock at a
         price per share less than the Current Market Price (as defined below)
         on the date fixed for determination of stockholders entitled to
         receive such rights or warrants, no adjustment need be made to the
         Conversion Price if the holders of the Debentures are to participate
         in such issuance of rights or warrants on a basis and with notice that
         the Board of Directors determines to be fair and appropriate in light
         of the basis and notice on which holders of Common Stock participate
         in such issuance of rights or warrants; PROVIDED that no Holder shall
         be required to convert such Holder's Debenture.  In the event that
         such Board of Directors determination is not made, the Conversion
         Price shall be adjusted so that the same shall equal the price
         determined by multiplying the Conversion Price in effect immediately
         prior to the date fixed for determination of stockholders entitled to
         receive such rights or warrants by a fraction of which the numerator



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<PAGE>

         shall be the number of shares of Common Stock outstanding at the close
         of business on the date fixed for determination of stockholders
         entitled to receive such rights and warrants plus the number of shares
         which the aggregate offering price of the total number of shares so
         offered would purchase at such Current Market Price, and of which the
         denominator shall be the number of shares of Common Stock outstanding
         on the date fixed for determination of stockholders entitled to
         receive such rights and warrants plus the total number of additional
         shares of Common Stock offered for subscription or purchase.  Such
         adjustments shall be successively made whenever any such rights and
         warrants are issued, and shall become effective immediately after the
         opening of business on the day following the date fixed for
         determination of stockholders entitled to receive such rights or
         warrants.  To the extent that shares of Common Stock are not delivered
         after the expiration of such rights or warrants, the Conversion Price
         shall be readjusted to the Conversion Price which would then be in
         effect had the adjustments made upon the issuance of such rights or
         warrants been made on the basis of delivery of only the number of
         shares of Common Stock actually delivered.  In the event that such
         rights or warrants are not so issued, the Conversion Price shall again
         be adjusted to be the Conversion Price which would then be in effect
         if such date fixed for the determination of stockholders entitled to
         receive such rights or warrants had not been fixed.  In determining
         whether any rights or warrants entitle the holders to subscribe for or
         purchase shares of Common Stock at less than such Current Market
         Price, and in determining the aggregate offering price of such shares
         of Common Stock, there shall be taken into account any consideration
         received by the Company for such rights or warrants, the value of such
         consideration, if other than cash, to be determined by the Board of
         Directors.

              (c)  In case outstanding shares of Common Stock shall be
         subdivided into a greater number of shares of Common Stock, the
         Conversion Price in effect at the opening of business on the day
         following the day upon which such subdivision becomes effective shall
         be proportionately reduced, and conversely, in case outstanding shares
         of Common Stock shall be combined into a smaller number of shares of
         Common Stock, the Conversion Price in effect at the opening of
         business on the day following the day upon which such combination
         becomes effective shall be proportionately increased, such reduction
         or increase, as the case may be, to become effective immediately after
         the opening of

                                          54

<PAGE>

         business on the day following the day upon which such subdivision or
         combination becomes effective.

              (d)  In case the Company shall, by dividend or otherwise,
         distribute to all holders of its Common Stock shares of any class of
         capital stock of the Company (other than any dividends or
         distributions to which Section 14.5(a) applies) or evidences of its
         indebtedness or assets (including securities, but excluding any rights
         or warrants referred to in Section 14.5(b), and excluding any dividend
         or distribution paid exclusively in cash (any of the foregoing
         hereinafter in this Section 14.5(d) called the "SECURITIES")), then,
         in each such case (unless (i) the Company elects to reserve such
         Securities for distribution to the Debentureholders upon the
         conversion of the Debentures so that any such holder converting
         Debentures will receive upon such conversion, in addition to the
         shares of Common Stock to which such holder is entitled, the amount
         and kind of such Securities which such holder would have received if
         such holder had converted its Debentures into Common Stock immediately
         prior to the Record Date (as defined in Section 14.5(g) for such
         distribution of the Securities) or (ii)the Holders are entitled to
         participate in such distribution on a basis and with notice that the
         Board of Directors determines to be fair and appropriate in light of
         the basis and notice on which holders of Common Stock participate in
         such distribution), the Conversion Price shall be reduced so that the
         same shall be equal to the price determined by multiplying the
         Conversion Price in effect on the Record Date with respect to such
         distribution by a fraction of which the numerator shall be the Current
         Market Price per share of the Common Stock on such Record Date less
         the fair market value (as determined by the Board of Directors, whose
         determination shall be conclusive, and described in a resolution of
         the Board of Directors) on the Record Date of the portion of the
         Securities so distributed applicable to one share of Common Stock and
         the denominator shall be the Current Market Price per share of the
         Common Stock, such reduction to become effective immediately prior to
         the opening of business on the day following such Record Date;
         PROVIDED, HOWEVER, that in the event the then fair market value (as so
         determined) of the portion of the Securities so distributed applicable
         to one share of Common Stock is equal to or greater than the Current
         Market Price of the Common Stock on the Record Date, in lieu of the
         foregoing adjustment, adequate provision shall be made so that each
         Debentureholder shall have the right to receive upon conversion the
         amount of Securities such

                                          55

<PAGE>

         holder would have received had such holder converted each Debenture on
         the Record Date.  In the event that such dividend or distribution is
         not so paid or made, the Conversion Price shall again be adjusted to
         be the Conversion Price which would then be in effect if such dividend
         or distribution had not been declared.  If the Board of Directors
         determines the fair market value of any distribution for purposes of
         this Section 14.5(d) by reference to the actual or when issued
         trading market for any securities, it must in doing so consider the
         prices in such market over the same period used in computing the
         Current Market Price of the Common Stock.

         In the event the Company implements a stockholder rights plan, such
rights plan shall provide that upon conversion of the Debentures the Holders
will receive, in addition to the Common Stock issuable upon such conversion, the
rights issued under such rights plan (notwithstanding the occurrence of an event
causing such rights to separate from the Common Stock at or prior to the time of
conversion).

         Rights or warrants distributed by the Company to all holders of Common
Stock entitling the holders thereof to subscribe for or purchase shares of the
Company's capital stock (either initially or under certain circumstances), which
rights or warrants, until the occurrence of a specified event or events
("TRIGGER EVENT"): (i) are deemed to be transferred with such shares of Common
Stock; (ii) are not exercisable; and (iii) are also issued in respect of future
issuances of Common Stock, shall be deemed not to have been distributed for
purposes of this Section 14.5 (and no adjustment to the Conversion Price under
this Section 14.5 will be required) until the occurrence of the earliest Trigger
Event, whereupon such rights and warrants shall be deemed to have been
distributed and an appropriate adjustment (if any is required) to the Conversion
Price shall be made under this Section 14.5(d). If any such right or warrant,
including any such existing rights or warrants distributed prior to the date of
this Indenture, are subject to events, upon the occurrence of which such rights
or warrants become exercisable to purchase different securities, evidences of
indebtedness or other assets, then the date of the occurrence of any and each
such event shall be deemed to be the date of distribution and record date with
respect to new rights or warrants with such rights (and a termination or
expiration of the existing rights or warrants without exercise by any of the
holders thereof).  In addition, in the event of any distribution (or deemed
distribution) of rights or warrants, or any Trigger Event or other event (of the
type described in the preceding sentence) with respect thereto that was counted
for purposes of calculating a distribution amount for which an adjustment to the
Conversion Price under this Section 14.5 was made, (1) in the case of any such
rights or warrants which shall all have been redeemed or repurchased without
exer-

                                          56

<PAGE>

cise by any holders thereof, the Conversion Price shall be readjusted upon such
final redemption or repurchase to give effect to such distribution or Trigger
Event, as the case may be, as though it were a cash distribution, equal to the
per share redemption or repurchase price received by a holder or holders of
Common Stock with respect to such rights or warrants (assuming such holder had
retained such rights or warrants), made to all holders of Common Stock as of the
date of such redemption or repurchase, and (2) in the case of such rights or
warrants which shall have expired or been terminated without exercise by any
holders thereof, the Conversion Price shall be readjusted as if such rights and
warrants had not been issued.

         For purposes of this Section 14.5(d) and Sections 14.5(a) and (b), any
dividend or distribution to which this Section 14.5(d) is applicable that also
includes shares of Common Stock, or rights or warrants to subscribe for or
purchase shares of Common Stock (or both) referred to in Section 14.5(b), shall 
be deemed instead to be (1) a dividend or distribution of the evidences of 
indebtedness, assets or shares of capital stock other than such shares of 
Common Stock or rights or warrants (and any Conversion Price reduction required
by this Section 14.5(d) with respect to such dividend or distribution shall 
then be made) immediately followed by (2) a dividend or distribution of such 
shares of Common Stock or such rights or warrants (and any further Conversion 
Price reduction required by Sections 14.5(a) and (b) with respect to such 
dividend or distribution shall then be made), except (A) the Record Date of 
such dividend or distribution shall be substituted as "the date fixed for 
the determination of stockholders entitled to receive such dividend or other 
distribution" and "the date fixed for such determination" within the meaning 
of Sections 14.5(a) and (b) and (B) any shares of Common Stock included in 
such dividend or distribution shall not be deemed "outstanding at the close 
of business on the date fixed for such determination" within the meaning of 
Section 14.5(a).

              (e)  In case the Company shall, by dividend or otherwise,
         distribute to all holders of its Common Stock cash (excluding (x) any

                                          57

<PAGE>

         cash dividend or other cash distribution on the Common Stock paid 
         during any 12-month period which when combined with (A) all such 
         all-cash distributions made within such 12-month period in respect 
         of which no adjustment has been made plus (B) any cash and the fair 
         market value of other consideration payable in respect of any 
         tender offers by the Company or any of its subsidiaries for Common 
         Stock concluded within such 12-month period in respect of which no 
         adjustment has been made, does not exceed 15% of the Company's 
         market capitalization (being the product of the Current Market 
         Price of the Common Stock times the number of shares of Common 
         Stock then outstanding) on the record  date for such dividend or 
         distribution, and (y) any dividend or distribution in connection 
         with the liquidation, dissolution or winding up of the Company, 
         whether voluntary or involuntary), then, in such case, the 
         Conversion Price shall be reduced so that the, same shall equal the 
         price determined by multiplying the Conversion Price in effect 
         immediately prior to the close of business on the Record Date for 
         such distribution by a fraction of which the numerator shall be the 
         Current Market Price of the Common Stock on the Record Date less 
         the amount of cash so distributed (and not excluded as provided 
         above) applicable to one share of Common Stock and the denominator 
         shall be such Current Market Price of the Common Stock, such 
         reduction to be effective immediately prior to the opening of 
         business on the day following the Record Date; PROVIDED, HOWEVER, 
         that in the event the portion of the cash so distributed applicable 
         to one share of Common Stock is equal to or greater than the 
         Current Market Price of the Common Stock on the Record Date, in 
         lieu of the foregoing adjustment, adequate provision shall be made 
         so that each Debentureholder shall have the right to receive upon 
         conversion the amount of cash such holder would have received had 
         such holder converted each Debenture on the Record Date. In the     
         event that such dividend or distribution is not so paid or made, 
         the Conversion Price shall again be adjusted to be the Conversion 
         Price which would then be in effect if such dividend or 
         distribution had not been declared.

                                          58

<PAGE>

              (f)  In case a tender or exchange offer made by the Company
         or any Subsidiary of the Company for all or any portion of the Common
         Stock shall expire and such tender or exchange offer (as amended upon
         the expiration thereof) shall require the payment to stockholders of
         consideration per share of Common Stock having a fair market value (as
         determined by the Board of Directors, whose determination shall be
         conclusive and described in a resolution of the Board of Directors)
         that as of the last time (the "EXPIRATION TIME") tenders or exchanges
         may be made pursuant to such tender or exchange offer (as it may be
         amended) that exceeds the Current Market Price of the Common Stock on
         the Trading Day next succeeding the Expiration Time, the Conversion
         Price shall be reduced so that the same shall equal the price
         determined by multiplying the Conversion Price in effect immediately
         prior to the Expiration Time by a fraction of which the numerator
         shall be the number of shares of Common Stock outstanding (including
         any tendered or exchanged shares) on the Expiration Time multiplied by
         the Current Market Price of the Common Stock on the Trading Day next
         succeeding the Expiration Time and the denominator shall be the sum of
         (x) the fair market value (determined as aforesaid) of the aggregate
         consideration payable to shareholders based on the acceptance (up to
         any maximum specified in the terms of the tender or exchange offer) of
         all shares validly tendered or exchanged and not withdrawn as of the
         Expiration Time (the shares deemed so accepted, up to any such
         maximum, being referred to as the "PURCHASED SHARES") and (y) the
         product of the number of shares of Common Stock outstanding (less any
         Purchased Shares) on the Expiration Time and the Current Market Price
         of the Common Stock on the Trading Day next succeeding the Expiration
         Time, such reduction to become effective as of immediately prior to
         the opening of business on the day following the Expiration Time.  In
         the event that the Company is obligated to purchase shares pursuant to
         any such tender or exchange offer, but the Company is permanently
         prevented by applicable law from effecting any such purchases or all
         such purchases are rescinded, the Conversion Price shall again be
         adjusted to be the Conversion Price which would then be in effect if
         such tender or exchange offer had not been made.

         
                                          59

<PAGE>              (g)  For purposes of this Section 14.5, the following 
terms shall have the meaning indicated:

                                          60

<PAGE>

              (1)  "CLOSING PRICE" with respect to any securities on any day
shall mean the closing sale price regular way on such day or, in the case no
such sale takes place on such day, the average of the reported closing bid and
asked prices, regular way, in each case on the New York Stock Exchange, or, if
such security is not listed or admitted to trading on such Exchange, on the
principal national security exchange or quotation system on which such security
is quoted or listed or admitted to trading, or, if not quoted or listed or
admitted to trading on any national securities exchange or quotation system, the
average of the closing bid and asked prices of such security on the over-the-
counter market on the day in question as reported by the National Quotation
Bureau Incorporated, or a similar generally accepted reporting service, or if
not so available, in such manner as furnished by any New York Stock Exchange
member firm selected from time to time by the Board of Directors for that
purpose, or a price determined in good faith by the Board of Directors or, to
the extent permitted by applicable law, a duly authorized committee thereof,
whose determination shall be conclusive.

              (2)  "CURRENT MARKET PRICE" shall mean the average of the daily
Closing Prices per share of Common Stock for the ten consecutive Trading Days
immediately prior to the date in question; PROVIDED, HOWEVER, that (1) if the
"ex" date (as hereinafter defined) for any event (other than the issuance or
distribution requiring such computation) that requires an adjustment to the
Conversion Price pursuant to Section 14.5(a), (b), (c), (d), (e) or (f)
occurs during such ten consecutive Trading Days, the Closing Price for each
Trading Day prior to the "ex" date for such other event shall be adjusted by
multiplying such Closing Price by the same fraction by which the Conversion
Price is so required to be adjusted as a result of such other event, (2) if the
"ex" date for any event (other than the issuance or distribution requiring such
computation) that requires an adjustment to the Conversion Price pursuant to
Section 14.5(a), (b), (c), (d), (e) or (f) occurs on or after the "ex" date
for the issuance or distribution requiring such computation and prior to the day
in question, the Closing Price for each Trading Day on and after the "ex" date
for such other event shall be adjusted by multiplying such Closing Price by the
reciprocal of the fraction by which the Conversion Price is so required to be
adjusted as a result of such other event, and (3) if the "ex" date for the
issuance or distribution requiring such computation is prior to the day in
question, after taking into account any adjustment required pursuant to clause
(1) or (2) of this proviso, the Closing Price for each Trading Day on or after
such "ex" date shall be adjusted by adding thereto the amount of any cash and
the fair market value (as determined by the Board of Directors or, to the extent
permitted by applicable law, a duly authorized committee thereof in a manner
consistent with any determination of such value for purposes of Section 14.5(d)
or (f) whose determination

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<PAGE>

shall be conclusive and described in a resolution of the Board of Directors or
such duly authorized committee thereof, as the case may be) of the evidences of
indebtedness, shares of capital stock or assets being distributed applicable to
one share of Common Stock as of the close of business on the day before such
"ex" date.  For purposes of any computation under Section 14.5(f) the
Current Market Price of the Common Stock on any date shall be deemed to be the
average of the daily Closing Prices per share of Common Stock for such day and
the next two succeeding Trading Days; PROVIDED, HOWEVER, that if the "ex" date
for any event (other than the tender or exchange offer requiring such
computation) that requires an adjustment to the Conversion Price pursuant to
Section 14.5(a), (b), (c), (d), (e) or (f) occurs on or after the Expiration 
Time for the tender or exchange offer requiring such computation and
prior to the day in question, the Closing Price for each Trading Day on and
after the "ex" date for such other event shall be adjusted by multiplying such
Closing Price by the reciprocal of the fraction by which the Conversion Price is
so required to be adjusted as a result of such other event.  For purposes of
this paragraph, the term "ex" date, (1) when used with respect to any issuance
or distribution, means the first date on which the Common Stock trades regular
way on the relevant exchange or in the relevant market from which the Closing
Price was obtained without the right to receive such issuance or distribution,
(2) when used with respect to any subdivision or combination of shares of Common
Stock, means the first date on which the Common Stock trades regular way on such
exchange or in such market after the time at which such subdivision or
combination becomes effective, and (3) when used with respect to any tender or
exchange offer means the first date on which the Common Stock trades regular way
on such exchange or in such market after the Expiration Time of such offer.

              (3)  "FAIR MARKET VALUE" shall mean the amount which a willing
buyer would pay a willing seller in an arm's length transaction.

              (4)  "RECORD DATE" shall mean, with respect to any dividend,
distribution or other transaction or event in which the holders of Common Stock
have the right to receive any cash, securities or other property or in which the
Common Stock (or other applicable security) is exchanged for or converted into
any combination of cash, securities or other property, the date fixed for
determination of shareholders entitled to receive such cash, securities or other
property (whether such date is fixed by the Board of Directors or by statute,
contract or otherwise).

              (5)  "TRADING DAY" shall mean (x) if the applicable security is
listed or admitted for trading on the New York Stock Exchange or another
national security exchange, a day on which the New York Stock Exchange or
another national security exchange is open for business or (y) if the applicable
security

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<PAGE>

is quoted on the Nasdaq National Market, a day on which trades may be made on
thereon or (z) if the applicable security is not so listed, admitted for trading
or quoted, any day other than a Saturday or Sunday or a day on which banking
institutions in the State of New York are authorized or obligated by law or
executive order to close.

                (h)  The Company may make such reductions in the Conversion  
         Price, in addition to those required by Sections 14.  5(a), (b), (c), 
         (d), (e) and (f) as the Board of Directors considers to be 
         advisable to avoid or diminish any income tax to holders of Common 
         Stock or rights to purchase Common Stock resulting from any dividend 
         or distribution of stock (or rights to acquire stock) or from any 
         event treated as such for income tax purposes.

              To the extent permitted by applicable law, the Company from time
         to time may reduce the Conversion Price by any amount for any period
         of time if the period is at least twenty (20) business days, the
         reduction is irrevocable during the period and the Board of Directors
         shall have made a determination that such reduction would be in the
         best interests of the Company, which determination shall be
         conclusive.  Whenever the Conversion Price is reduced pursuant to the
         preceding sentence, the Company shall mail to holders of record of the
         Debentures a notice of the reduction at least fifteen (15) days prior
         to the date the reduced Conversion Price takes effect, and such notice
         shall state the reduced Conversion Price and the period during which
         it will be in effect.

              (i)  No adjustment in the Conversion Price shall be required 
         unless such adjustment would require an increase or decrease of at 
         least 1% in such price; PROVIDED, HOWEVER, that any adjustments which
         by reason of this Section 14.5(i) are not required to be made shall be
         carried forward and taken into account in any subsequent adjustment. 
         All calculations under this Article XIV shall be made by the Company 
         and shall be made to the nearest cent or to the nearest one thousandth
         of a share, as the case may be.  No adjustment need be made for rights
         to purchase Common Stock pursuant to a Company plan for reinvestment of
         dividends or interest.  To the extent the Debentures become convertible
         into cash, assets, property or securities (other than capital stock of 
         the Company), no adjustment need be made thereafter as to the cash, 
         assets, property or such securities.  Interest will not accrue on the 
         cash.

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<PAGE>

                (j)  Whenever the Conversion Price is adjusted as herein 
         provided, the Company shall promptly file with the Trustee and any
         Conversion Agent other than the Trustee an Officers' Certificate 
         setting forth the Conversion Price after such adjustment and setting 
         forth a brief statement of the facts requiring such adjustment. 
         Promptly after delivery of such certificate, the Company shall prepare 
         a notice of such adjustment of the Conversion Price setting forth the
         adjusted Conversion Price and the date on which each adjustment becomes
         effective and shall mail such notice of such adjustment of the 
         Conversion Price to the holder of each Debenture at his last address 
         appearing on the Debenture register, within 20 days after execution 
         thereof. Failure to deliver such notice shall not affect the legality 
         or validity of any such adjustment.

              (k)  In any case in which this Section 14.5 provides that an 
         adjustment shall become effective immediately after a record date for
         an event, the Company may defer until the occurrence of such event (i)
         issuing to the holder of any Debenture converted after such record 
         date and before the occurrence of such event the additional shares of
         Common Stock issuable upon such conversion by reason of the adjustment
         required by such event over and above the Common Stock issuable upon
         such conversion before giving effect to such adjustment and (ii)
         paying to such holder any amount in cash in lieu of any fraction 
         pursuant to Section 14.3.

              (l)  For purposes of this Section 14.5, the number of shares of
         Common Stock at any time outstanding shall not include shares held in
         the treasury of the Company but shall include shares issuable in
         respect of scrip certificates issued in lieu of fractions of shares of
         Common Stock.  The Company will not pay any dividend or make any
         distribution on shares of Common Stock held in the treasury of the
         Company.

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<PAGE>

Section 14.6  EFFECT OF RECLASSIFICATION, CONSOLIDATION, MERGER OR SALE.  If
any of the following events occur, namely (i) any reclassification or change of
the outstanding shares of Common Stock (other than a subdivision or combination
to which Section 14.5(c) applies), (ii) any consolidation, merger or combination
of the Company with another corporation as a result of which holders of Common
Stock shall be entitled to receive stock, securities or other property or assets
(including cash) with respect to or in exchange for such Common Stock, or (iii)
any sale or conveyance of the properties and assets of the Company as, or
substantially as, an entirety to any other corporation (as

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<PAGE>

as a result of which holders of Common Stock shall be entitled to receive 
stock, securities or other property or assets (including cash) with respect 
to or in exchange for such Common Stock, then the Company or the successor or 
purchasing corporation, as the case may be, shall execute with the Trustee a 
supplemental indenture (which shall comply with the Trust Indenture Act as in 
force at the date of execution of such supplemental indenture) providing that 
such Debentures shall be convertible into the kind and amount of shares of 
stock and other securities or property or assets (including cash) receivable 
upon such reclassification, change, consolidation, merger, combination, sale 
or conveyance by a holder of a number of shares of Common Stock issuable upon 
conversion of such Debentures (assuming, for such purposes, a sufficient 
number of authorized shares of Common Stock available to convert all such 
Debentures) immediately prior to such reclassification, change, 
consolidation, merger, combination, sale or conveyance assuming such holder 
of Common Stock did not exercise such holder's rights of election, if any, as 
to the kind or amount of shares of stock and other securities or property or 
assets (including cash) receivable upon such reclassification, change, 
consolidation, merger, combination, sale or conveyance (provided that, if the 
kind or amount of shares of stock and other securities or property or assets 
(including cash) receivable upon such reclassification, change, 
consolidation, merger, combination, sale or conveyance is not the same for 
each share of Common Stock in respect of which such rights of election shall 
not have been exercised ("nonelecting share"), then for the purposes of this 
Section 14.6 the kind and amount of shares of stock and other securities or 
property or assets (including cash) receivable upon such reclassification, 
change, consolidation, merger, combination, sale or conveyance for each 
non-electing share shall be deemed to be the kind and amount so receivable 
per share by a plurality of the non-electing shares).  Such supplemental 
indenture shall provide for adjustments which shall be as nearly equivalent 
as may be practicable to the adjustments provided for in this Article.

         The Company shall cause notice of the execution of such supplemental
indenture to be mailed to each holder of Debentures, at his address appearing on
the Debenture register provided for in Section 2.5 of this Indenture, within
twenty (20) days after execution thereof.  Failure to deliver such notice shall
not affect the legality or validity of such supplemental indenture.

         The above provisions of this Section shall similarly apply to
successive reclassifications, changes, consolidations, mergers, combinations,
sales and conveyances.

         If this Section 14.6 applies to any event or occurrence, Section 14.5
shall not apply.

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<PAGE>

         Section 14.7  TAXES ON SHARES ISSUED.  The issue of stock certificates
on conversions of Debentures shall be made without charge to the converting
Debentureholder for any tax in respect of the issue thereof.  The Company shall
not, however, be required to pay any tax which may be payable in respect of any
transfer involved in the issue and delivery of stock in any name other than that
of the holder of any Debenture converted, and, in such event, the Company shall
not be required to issue or deliver any such stock certificate unless and until
the person or persons requesting the issue thereof shall have paid to the
Company the amount of such tax or shall have established to the satisfaction of
the Company that such tax had been paid.

         Section 14.8  RESERVATION OF SHARES; SHARES TO BE FULLY PAID;
COMPLIANCE WITH GOVERNMENTAL REQUIREMENTS; LISTING OF COMMON STOCK.  The Company
shall reserve, free from preemptive rights, out of its authorized but unissued
shares or shares held in treasury, sufficient shares of Common Stock to provide
for the conversion of the Debentures from time to time as such Debentures are
presented for conversion.

         Before taking any action which would cause an adjustment reducing the
Conversion Price below the then par value, if any, of the shares of Common Stock
issuable upon conversion of the Debentures, the Company will take all corporate
action which may, in the opinion of its counsel, be necessary in order that the
Company may validly and legally issue shares of such Common Stock at such
adjusted Conversion Price.  

         The Company covenants that all shares of Common Stock which may be
issued upon conversion of Debentures will upon issue be fully paid and
non-assessable by the Company and free from all taxes, liens and charges with
respect to the issue thereof.

         The Company covenants that if any shares of Common Stock to be
provided for the purpose of conversion of Debentures hereunder require
registration with or approval of any governmental authority under any federal or
state law before such shares may be validly issued upon conversion, the Company
will in good faith and as expeditiously as possible endeavor to secure such
registration or approval, as the case may be.

         The Company further covenants that if at any time the Common Stock
shall be listed on the New York Stock Exchange or any other national securities
exchange the Company will, if permitted by the rules of such exchange, list and
keep listed so long as the Common Stock shall be so listed on such exchange, all
Common Stock issuable upon conversion of the Debentures.

         Section 14.9  RESPONSIBILITY OF TRUSTEE.  The Trustee and any other
Conversion Agent shall not at any time be under any duty or responsibility to
any holder of Debentures to

                                          69
<PAGE>


determine whether any facts exist which may require any adjustment of the
Conversion Price, or with respect to the nature or extent or calculation of any
such adjustment when made, or with respect to the method employed, or herein or
in any supplemental indenture provided to be employed, in making the same.  The
Trustee and any other Conversion Agent shall not be accountable with respect to
the validity or value (or the kind or amount) of any shares of Common Stock, or
of any securities or property, which may at any time be issued or delivered upon
the conversion of any Debenture; and the Trustee and any other Conversion Agent
make no representations with respect thereto.  Subject to the provisions of
Section 7.1, neither the Trustee nor any Conversion Agent shall be responsible
for any failure of the Company to issue, transfer or deliver any shares of
Common Stock or stock certificates or other securities or property or cash upon
the surrender of any Debenture for the purpose of conversion or to comply with
any of the duties, responsibilities or covenants of the Company contained in
this Article.  Without limiting the generality of the foregoing, neither the
Trustee nor any Conversion Agent shall be under any responsibility to determine
the correctness of any provisions contained in any supplemental indenture
entered into pursuant to Section 14.6 relating either to the kind or amount of
shares of stock or securities or property (including cash) receivable by
Debentureholders upon the conversion of their Debentures after any event
referred to in such Section 14.6 or to any adjustment to be made with respect
thereto, but, subject to the provisions of Section 7.1, may accept as conclusive
evidence of the correctness of any such provisions, and shall be protected in
relying upon, the Officers' Certificate (which the Company shall be obligated to
file with the Trustee prior to the execution of any such supplemental indenture)
with respect thereto.

         Section 14.10  NOTICE TO HOLDERS PRIOR TO CERTAIN ACTIONS.  In case:

              (1)  the Company shall declare a dividend (or any other
distribution) on its Common Stock that would require an adjustment in the
Conversion Price pursuant to Section 14.5; or

              (2)  the Company shall authorize the granting to all or
substantially all the holders of its Common Stock of rights or warrants to
subscribe for or purchase any share of any class or any other rights or
warrants; or

              (3)  of any reclassification or reorganization of the Common
Stock of the Company (other than a subdivision or combination of its outstanding
Common Stock, or a change in par value, or from par value to no par value, or
from no par value to par value), or of any consolidation or merger to which the
Company is a party and for which approval of any stockholders of the


                                          70

<PAGE>

Company is required, or of the sale or transfer of all or substantially all of
the assets of the Company; or

              (4)  of the voluntary or involuntary dissolution, liquidation or
winding-up of the Company;

the Company shall cause to be filed with the Trustee and to be mailed to each
holder of Debentures, as promptly as possible but in any event at least fifteen
(15) days prior to the applicable date hereinafter specified, a notice stating
(x) the date on which a record is to be taken for the purpose of such dividend,
distribution or rights or warrants, or, if a record is not to be taken, the date
as of which the holders of Common Stock of record to be entitled to such
dividend, distribution, or rights or warrants are to be determined, or (y) the
date on which such reclassification, consolidation, merger, sale, transfer,
dissolution, liquidation or winding-up is expected to become effective or occur,
and the date as of which it is expected that holders of Common Stock of record
shall be entitled to exchange their Common Stock for securities or other
property deliverable upon such reclassification, consolidation, merger, sale,
transfer, dissolution, liquidation or winding-up.  Failure to give such notice,
or any defect therein, shall not affect the legality or validity of such
dividend, distribution, reclassification, consolidation, merger, sale, transfer,
dissolution, liquidation or winding-up.


                                      ARTICLE XV

                           REPURCHASE OF DEBENTURES AT THE
                     OPTION OF THE HOLDER UPON CHANGE IN CONTROL

         Section 15.1  RIGHT TO REQUIRE REPURCHASE.  In the event that a Change
in Control (as hereinafter defined) shall occur, then each Holder shall have the
right, at the Holder's option, to require the Company to repurchase, and upon
the exercise of such right the Company shall repurchase, all of such holder's
Debentures, or any portion of the principal amount thereof that is an integral
multiple of $1,000 (provided that no single Debenture may be repurchased in part
unless the portion of the principal amount of such Debenture to be outstanding
after such repurchase is equal to $1,000 or an integral multiple of $1,000), on
the date (the "REPURCHASE DATE") that is 30 days after the date of the Company
Notice (as defined in Section 15.2) for cash at a purchase price equal to 100%
of the principal amount (the "REPURCHASE PRICE"), plus interest accrued and
unpaid interest to, but excluding, the Repurchase Date; PROVIDED that if the
Repurchase Date is _________ or ________, then the interest payable on such date
shall be paid to the holder of record of the Debenture on the next preceding
__________ or _____________, respectively.  Whenever in this Indenture there is
a reference, in any context, to the principal of any Debenture as of any time,


                                          71

<PAGE>

such reference shall be deemed to include reference to the Repurchase Price
payable in respect of such Debenture to the extent that such Repurchase Price
is, was or would be so payable at such time, and express mention of the
Repurchase Price in any provision of this Indenture shall not be construed as
excluding the Repurchase Price in those provisions of this Indenture when such
express mention is not made.

         Section 15.2  NOTICES; METHOD OF EXERCISING REPURCHASE RIGHT, ETC.

              (a)  Unless the Company shall have theretofore called for
redemption all of the outstanding Debentures pursuant to Article III, on or
before the 30th day after the occurrence of a Change in Control, the Company or,
at the request of the Company on or before the 15th day after such occurrence,
the Trustee shall give to all holders of Debentures notice (the "Company
Notice") of the occurrence of the Change in Control and of the repurchase right
set forth herein arising as a result thereof.  The Company shall also deliver a
copy of such notice of a repurchase right to the Trustee.

         Each Company Notice shall state:

                      (i)    the Repurchase Date,

                     (ii)    the date by which the repurchase right must be
    exercised,

                    (iii)    the Repurchase Price,

                     (iv)    a description of the procedure which a holder must
    follow to exercise a repurchase right,

                      (v)    that on the Repurchase Date the Repurchase Price
    will become due and payable upon each such note designated by the holder to
    be repurchased, and that interest thereon shall cease to accrue on and after
    said date,

                     (vi)    the Conversion Price, the date on which the right
    to convert the Debentures to be repurchased will terminate and the places
    where such Debentures may be surrendered for conversion, and

                    (vii)    the place or places where such Debentures are to
    be surrendered for payment of the Repurchase Price and accrued interest, if
    any.

         No failure of the Company to give the foregoing notices or defect
therein shall limit any holder's right to exercise a


                                          72

<PAGE>

repurchase right or affect the validity of the proceedings for the repurchase of
Debentures.

         If any of the foregoing provisions or other provisions of this Article
are inconsistent with applicable law, such law shall govern.

              (b)  To exercise a repurchase right, a holder shall deliver to
the Trustee or any Paying Agent on or before the 30th day after the date of the
Company Notice (i) written notice of the holder's exercise of such right, which
notice shall set forth the name of the holder, the principal amount of the
Debentures to be repurchased (and, if any Debenture is to be repurchased in
part, the serial number thereof, the portion of the principal amount thereof to
be repurchased and the name of the Person in which the portion thereof to remain
outstanding after such repurchase is to be registered) and a statement that an
election to exercise the repurchase right is being made thereby, and (ii) the
Debentures with respect to which the repurchase is being exercised.

              (c)  In the event a repurchase right shall be exercised in
accordance with the terms hereof, the Company shall pay or cause to be paid to
the Trustee or the Paying Agent the Repurchase Price in cash, for payment to the
holder on the Repurchase Date, together with accrued and unpaid interest to, but
excluding, the Repurchase Date payable with respect to the Debentures as to
which the purchase right has been exercised.

              (d)  If any Debenture (or portion thereof) surrendered for
repurchase to be paid on the Repurchase Date, the principal amount of such
Debenture (or portion thereof, as the case may be) shall, until paid, bear
interest from the Repurchase Date at the rate borne by the Debentures, and each
Debenture shall remain convertible into Common Stock until the principal of such
Debenture (or portion thereof, as the case may be) shall have been paid or duly
provided for.

              (e)  Any Debenture which is to be repurchased only in part shall
be surrendered to the Trustee (with, if the Company or the Trustee so requires,
due endorsement by, or a written instrument of transfer in form satisfactory to
the Company and the Trustee duly executed by, the holder thereof or his attorney
duly authorized in writing), and the Company shall execute, and the Trustee
authenticate and deliver to the holder of such Debenture without service charge,
a new Debenture or Debentures, containing identical terms and conditions, each
in an authorized denomination in aggregate principal amount equal to and in
exchange for the portion of the principal of the Debenture so surrendered that
was not repurchased.


                                          73


<PAGE>

              (f)  Any holder that has delivered to the Trustee its written
notice exercising its right to require the Company to repurchase its Debentures
upon a Change in Control shall have the right to withdraw such notice at any
time prior to the close of business on the Repurchase Date by delivery of a
written notice of withdrawal to the Trustee prior to the close of business on
such date.  A Debenture in respect of which a holder is exercising its option to
require repurchase upon a Change in Control may be converted into Common Stock
in accordance with Article XV only if such holder withdraws its notice in
accordance with the preceding sentence.

         Section 15.3  CERTAIN DEFINITIONS.  For purposes of this Article XV
only,

              (1)  the term "BENEFICIAL OWNER" shall be determined in
accordance with Rule 13d-3 promulgated by the Commission pursuant to the
Exchange Act; and

              (2)  the term "PERSON" shall include any syndicate or group which
would be deemed to be a "person" under Section 13(d)(3) of the Exchange Act.

         Section 15.4  CHANGE IN CONTROL.  A "CHANGE IN CONTROL" shall be
deemed to have occurred at such time after the original issuance of the
Debentures as:

              (1)  there is a report filed by any Person, other than the
Company, any Subsidiary of the Company, or any employee benefit plan of the
Company or any such Subsidiary, on Schedule 13D or 14D-1 pursuant to the
Exchange Act, disclosing that such Person has become the Beneficial Owner,
directly or indirectly, through a purchase or other acquisition transaction or
series of transactions (other than a merger or consolidation involving the
Company), of shares of capital stock of the Company which entitle such Person to
exercise in excess of 50% of the total voting power of all shares of capital
stock of the Company entitled to vote generally in the election of directors; or

              (2)  there occurs any consolidation of the Company with, or
merger of the Company into, any other Person, any merger of another Person into
the Company, or any sale or transfer of all or substantially all of the assets
of the Company to another Person (other than (i) any such transaction pursuant
to which the holders of the Common Stock immediately prior to such transaction
have, directly or indirectly, shares of capital stock of the continuing or
surviving corporation immediately after such transaction which entitle such
holders to exercise in excess of 50% of the total voting power of all shares of
capital stock of the continuing or surviving corporation entitled to vote
generally in the election of directors and (ii) any merger (1) which does not
result in any reclassification, conversion, exchange or


                                          74

<PAGE>

cancellation of outstanding shares of Common Stock or (2) which is effected
solely to change the jurisdiction of incorporation of the Company and results in
a reclassification, conversion or exchange of outstanding shares of Common Stock
solely into shares of common stock).

         Section 15.5  CONSOLIDATION, MERGER, ETC.  In the case of any
reclassification, change, consolidation, merger, combination, sale or conveyance
to which Section 14.6 applies, in which the Common Stock of the Company is
changed or exchanged as a result into the right to receive shares of stock and
other securities or property or assets (including cash) which includes shares of
Common Stock of the Company or common stock of another Person that are, or upon
issuance will be, traded on a United States national securities exchange or
approved for trading on an established automated over-the-counter trading market
in the United States and such shares constitute at the time such change or
exchange becomes effective in excess of 50% of the aggregate fair market value
of such shares of stock and other securities, property and assets (including
cash) (as determined by the Company, which determination shall be conclusive and
binding), then the Person formed by such consolidation or resulting from such
merger or combination or which acquires the properties or assets (including
cash) of the Company, as the case may be, shall execute and deliver to the
Trustee a supplemental indenture (which shall comply with the Trust Indenture
Act as in force at the date of execution of such supplemental indenture)
modifying the provisions of this Indenture relating to the right of holders of
the Debentures to cause the company to repurchase the Debentures following a
Change in Control, including without limitation the applicable provisions of
this Article XV and the definitions of the Common Stock and Change in Control,
as appropriate, and such other related definitions set forth herein as
determined in good faith by the Company (which determination shall be conclusive
and binding), to make such provisions apply to the common stock and the issuer
thereof if different from the Company and Common Stock of the Company (in lieu
of the Company and the Common Stock of the Company).


                                     ARTICLE XVI

                               MISCELLANEOUS PROVISIONS

         Section 16.1  SUCCESSORS.  All agreements of the Company in this
Indenture and the Debentures shall bind its successor.  All agreements of the
Trustee in this Indenture shall bind its successor.

         Section 16.2  OFFICIAL ACTS BY SUCCESSOR CORPORATION.  Any act of
proceeding by any provision of this Indenture authorized or required to be done
or performed by any board, committee


                                          75

<PAGE>

or officer of the Company shall and may be done and performed with like force
and effect by the like board, committee or officer of any corporation that shall
at the time be the lawful sole successor of the Company.

         Section 16.3  NOTICES.  Any notice or communication shall be in
writing and delivered in person or mailed by first-class mail, postage prepaid,
addressed as follows:

         if to the Company:

              ALZA Corporation
              950 Page Mill Road
              P O Box 10950
              Palo Alto, California 94303 - 0802
              Attention:  Vice President and General Counsel

         if to the Trustee:

              The Chase Manhattan Bank, N.A.
              4 Chase MetroTech Center, 3rd Floor
              Brooklyn, New York  11245
              Attention: Institutional Trust Group

         The Trustee, by notice to the Company, may designate additional or
different addresses for subsequent notices or communications.

         Any notice or communication mailed to a Debentureholder shall be
mailed to such Holder by first class mail, postage prepaid, at his address as 
it appears on the Debenture register and shall be sufficiently given to such
Holder if so mailed with the time prescribed.

         Failure to mail a notice or communication to a Debentureholder or any
defect in it shall not affect its sufficiency with respect to other
Debentureholders.  If a notice or communication is mailed in the manner provided
above, it is duly given, whether or not the addressee receives it.

         Section 16.4  GOVERNING LAW.  This Indenture and the Debentures shall
be governed by and construed in accordance with the laws of the state of New
York, as applied to contracts made and performed within the state of New York,
without regard to principles of conflict of laws.

         Section 16.5  CERTIFICATE AND OPINION AS TO CONDITIONS PRECEDENT.
Upon any request or application by the Company to the Trustee to take any action
under this Indenture, the Company shall furnish to the Trustee:

              (1)  an Officers' Certificate stating that, in the opinion of the
signers, all conditions precedent, if any, provid-


                                          76

<PAGE>

ed for in this Indenture relating to the proposed action have been complied
with; and

              (2)  an Opinion of Counsel stating that, in the opinion of such
counsel, all such conditions precedent have been complied with.

         Section 16.6  STATEMENTS REQUIRED IN CERTIFICATE OR OPINION.  Each
Officers' Certificate or Opinion of Counsel with respect to compliance with a
covenant or condition provided for in this Indenture shall include:

              (1)  a statement that each person making such Officers'
Certificate or Opinion of Counsel has read such covenant or condition;

              (2)  a brief statement as to the nature and scope of the
examination or investigation upon which the statements or opinions contained in
such Officers' Certificate or Opinion of Counsel are based;

              (3)  a statement that, in the opinion of each such person, he has
made such examination or investigation as is necessary to enable such person to
express an informed opinion as to whether or not such covenant or condition has
been complied with; and

              (4)  a statement that, in the opinion of such person, such
covenant or condition has been complied with.

         Section 16.7  LEGAL HOLIDAYS.  A "Legal Holiday" is any day other than
a Business Day.  If any specified date (including a date for giving notice) is a
Legal Holiday, the action shall be taken on the next succeeding day that is not
a Legal Holiday, and to the extent applicable no interest, if any, shall accrue
for the intervening period.

         Section 16.8  TRUST INDENTURE ACT CONTROLS.  If any provision hereof
limits, qualifies or conflicts with another provision hereof which is required
to be included in an indenture qualified under the Trust Indenture Act, such
required provision shall control.

         Section 16.9  NO SECURITY INTEREST CREATED.  Nothing in this Indenture
or in the Debentures, expressed or implied, shall be construed to constitute a
security interest under the Uniform Commercial Code or similar legislation, as
now or hereafter enacted and in effect, in any jurisdiction where property of
the Company or its subsidiaries is located.

         Section 16.10  BENEFITS OF INDENTURE.  Nothing in this Indenture or in
the Debentures, expressed or implied, shall give


                                          77

<PAGE>

to any Person, other than the parties hereto, any Paying Agent, any
authenticating agent, any Debenture registrar and their successors hereunder,
the holders of Debentures and the holders of Senior Indebtedness, any benefit or
any legal for equitable right, remedy or claim under this Indenture.

         Section 16.11  TABLE OF CONTENTS, HEADINGS, ETC.  The table of
contents and the titles and headings of the articles and sections of this
Indenture have been inserted for convenience of reference only, are not to be
considered a part hereof, and shall in no way modify or restrict any of the
terms or provisions hereof.

         Section 16.12  AUTHENTICATING AGENT.  The Trustee may appoint an
authenticating agent which shall be authorized to act on its behalf and subject
to its direction in the authenticating and delivery of Debentures in connection
with the original issuance thereof and transfers and exchanges of Debentures
hereunder, including under Sections 2.2, 2.6, 2.7, 2.9, 3.3, 14.2 and 15.2, as
fully to all intents and purposes as though the authenticating agent had been
expressly authorized by this Indenture and those Sections to authenticate and
deliver Debentures.  For all purposes of this Indenture, the authentication and
delivery of Debentures by the authenticating agent shall be deemed to be
authentication and delivery of such Debentures "by the Trustee" and a
certificate of authentication executed on behalf of the Trustee by an
authenticating agent shall be deemed to satisfy any requirement hereunder or in
the Debentures for the Trustee's certificate of authentication.  Such
authenticating agent shall at all times be a person eligible to serve as trustee
hereunder pursuant to Section 7.9.

         Any corporation into which any authenticating agent may be merged or
converted or with which it may be consolidated, or any corporation resulting
from any merger, consolidation or conversion to which any authenticated agent
shall be a party, or any corporation succeeding to the corporate trust business
of any authenticating agent, shall be the successor of the authenticating agent
hereunder, if such successor corporation is otherwise eligible under this
Section 16.12, without the execution or filing of any paper or any further act
on the part of the parties hereto or the authenticating agent or such successor
corporation.

         Any authenticating agent may at any time resign by giving written
notice of resignation to the Trustee and to the Company.  The Trustee may at any
time terminate the agency of any authenticating agent by giving written notice
of termination to such authenticating agent and to the Company.  Upon receiving
such a notice of resignation or upon such a termination, or in case at any time
any authenticating agent shall cease to be eligible under this Section, the
Trustee shall either promptly appoint a successor authenticating agent or itself
assume the


                                          78

<PAGE>

duties and obligations of the former authenticating agent under this Indenture,
and upon such appointment of a successor authenticating agent, if made, shall
give written notice of such appointment of a successor authenticating agent to
the Company and shall mail notice of such appointment of a successor
authenticating agent to all holders of Debentures as the names and addresses of
such holders appear on the Debenture register.

         The Trustee agrees to pay to the authenticating agent from time to
time reasonable compensation for its services (to the extent pre-approved by the
Company in writing), and the Trustee shall be entitled to be reimbursed for such
pre-approved payments, subject to Section 7.6.

         The provisions of Sections 7.2, 7.3, 7.4, 8.3 and this Section 16.12
shall be applicable to any authenticating agent.

         Section 16.13  SEPARABILITY CLAUSE.  In case any provision in this
Indenture or in the Debentures shall be invalid, illegal or unenforceable, the
validity, legality and enforceability of the remaining provisions shall not in
any way be affected or impaired thereby.

         Section 16.14  RULES BY TRUSTEE, PAYING AGENT, CONVERSION AGENT AND
REGISTRAR.  The Trustee may make reasonable rules for action by or a meeting of
the Debentureholders.  The Registrar, Conversion Agent and the Paying Agent may
make reasonable rules for their functions.

         Section 16.15  NO RECOURSE AGAINST OTHERS.  A director, officer,
employee or stockholder, as such, of the Company shall not have any liability
for any obligations of the Company under the Debentures or this Indenture or for
any claim based on, in respect of or by reason of such obligations or their
creation.  By accepting a Debenture, each Debentureholder shall waive and
release all such liability.  The waiver and release shall be part of the
consideration for the issue of the Debentures.

         Section 16.16  EXECUTION IN COUNTERPARTS.  This Indenture may be
executed in any number of counterparts, each of which shall be an original, but
such counterparts shall together constitute but one and the same instrument.

         The Chase Manhattan Bank, N.A. hereby accepts the trusts in this 
Indenture declared and provided, upon the terms and conditions hereinabove set 
forth.


                                          79


<PAGE>
          IN WITNESS WHEREOF, the parties hereto have caused this Indenture to
be duly signed, all as of the date first written above.

ALZA CORPORATION



                                             By: _______________________________

                                             Name: _____________________________

                                             Title: ____________________________


Attest:

____________________
Title:


                                             THE CHASE MANHATTAN BANK, N.A.
                                             not in its individual capacity but
                                             solely as Trustee





                                             By: _______________________________

                                             Name: _____________________________

                                             Title: ____________________________


Attest:

____________________
Title:

<PAGE>
                                    EXHIBIT A



                                ALZA CORPORATION

                  % CONVERTIBLE SUBORDINATED DEBENTURE DUE 2006
              ----


No. __                                                            CUSIP ________


     ALZA Corporation, a corporation duly organized and validly existing under
the laws of the State of Delaware (herein called the "Company"), which term
includes any successor corporation under the Indenture referred to on the
reverse hereof, for value received hereby promises to pay to
_____________________ or registered assigns, the principal sum of __________
($__________) on        , 2006, at the office or agency of the Company main-
tained for that purpose in The City of New York, or,
at the option of the holder of this Debenture, at the Corporate Trust Office, in
such coin or currency of the United States of America as at the time of payment
shall be legal tender for the payment of public and private debts, and to pay
interest, semi-annually on ___________ and ___________ of each year, commencing
[___________, 1996], on said principal sum at said office or agency, in like
coin or currency, at the rate per annum of   %, from ___________ or ___________,
as the case may be, next preceding the date of this Debenture to which interest
has been paid or duly provided for, unless the date hereof is a date to which
interest has been paid or duly provided for, in which case from the date of this
Debenture, or unless no interest has been paid or duly provided for on the
Debentures, in which case from [___________   ,] until payment of said principal
sum has been made or duly provided for.  Notwithstanding the foregoing, if the
date hereof is after any ___________ or ___________, as the case may be, and
before the following ___________ or ___________, this Debenture shall bear
interest from such ___________ or ___________; PROVIDED, HOWEVER, that if the
Company shall default in the payment of interest due on such ___________ or
___________, then this Debenture shall bear interest from the next preceding
___________ or ___________ to which interest has been paid or duly provided for
or, if no interest has been paid or duly provided for on such Debenture, from
[___________] 1996.  The interest payable on the Debenture pursuant to the
Indenture on any ___________ or ___________ will be paid to the person in whose
name this Debenture (or one or more Predecessor Debentures) is registered at the
close of business on the record date, which shall be the ___________ or
___________ (whether or not a Business Day) next preceding such ___________ or
___________, as provided in the Indenture; PROVIDED that any such interest not
punctually paid or duly provided

<PAGE>

for shall be payable as provided in the Indenture.  Interest may, at the option
of the Company, be paid by check mailed to the registered address of such
person.

     Reference is made to the further provisions of this Debenture set forth on
the reverse hereof, including, without limitation, provisions subordinating the
payment of principal of and premium, if any, and interest on the Debentures to
the prior payment in full of all Senior Indebtedness, as defined in the
Indenture, and provisions giving the holder of this Debenture the right to
convert this Debenture into Common Stock of the Company on the terms and subject
to the limitations referred to on the reverse hereof and as more fully specified
in the Indenture.  Such further provisions shall for all purposes have the same
effect as though fully set forth at this place.

     This Debenture shall be deemed to be a contract made under the laws of the
State of New York, and for all purposes shall be construed in accordance with
and governed by the laws of said State.

     This Debenture shall not be valid or become obligatory for any purpose
until the certificate of authentication hereon shall have been manually signed
by the Trustee or a duly authorized authenticating agent under the Indenture.

<PAGE>

     IN WITNESS WHEREOF, the Company has caused this Debenture to be duly
executed under its corporate seal.



Dated:                             ALZA CORPORATION


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



[SEAL]                             Attest:
                                          --------------------------------------



TRUSTEE'S CERTIFICATE OF AUTHENTICATION

This is one of the Debentures described in
the within-named Indenture.


THE CHASE MANHATTAN BANK, N.A., not in its individual capacity but solely as 
Trustee


By:
   --------------------------------
   Authorized Signatory


By:
   -------------------------------
   As Authenticating Agent
   (if different from Trustee)

<PAGE>

                         [FORM OF REVERSE OF DEBENTURE]

                                ALZA CORPORATION

                  % CONVERTIBLE SUBORDINATED DEBENTURE DUE 2006
              ----


     This Debenture is one of a duly authorized issue of Debentures of the
Company, designated as its ___% Convertible Subordinated Debentures due 2006
(the "Debentures"), issued pursuant to an indenture, dated as of April ___,
1996 (the "Indenture"), between the Company and The Chase Manhattan Bank, N.A.,
not in its individual capacity but solely as trustee (the "Trustee").
Reference is hereby made to the Indenture for a description of the rights,
limitations of rights, obligations, duties and immunities thereunder of the
Trustee, the Company and the holders of the Debentures.

     In case an Event of Default, as defined in the Indenture, shall have
occurred and be continuing, the principal of and accrued interest on all
Debentures may be declared, and upon said declaration shall become, due and
payable, in the manner, with the effect and subject to the conditions provided
in the Indenture.

     The Indenture contains provisions permitting the Company and the Trustee,
with the consent of the holders of not less than a majority in aggregate
principal amount of the Debentures at the time outstanding, evidenced as in the
Indenture provided, to execute supplemental indentures adding any provisions to
or changing in any manner or eliminating any of the provisions of the Indenture
or of any supplemental indenture or modifying in any manner the rights of the
holders of the Debentures; PROVIDED, HOWEVER, that no such supplemental
indenture shall (i) extend the fixed maturity of any Debenture, or reduce the
rate or extend the time of payment of interest thereon, or reduce the principal
amount thereof or premium, if any, thereon, or reduce any amount payable on
redemption thereof, or impair the right of any Debentureholder to institute suit
for the payment thereof, or make the principal thereof or interest or premium,
if any, thereon payable in any coin or currency other than that provided in the
Debenture, or modify the provisions of the Indenture with respect to the
subordination of the Debentures in a manner adverse to the Debentureholders in
any material respect, or change the obligation of the Company to repurchase any
Debenture upon the occurrence of a Change in Control in a manner adverse to the
holder of the Debentures, or impair the right to convert the Debentures into
Common Stock subject to the terms set forth in the Indenture, including Section
14.7 thereof, without the consent of the holder of each Debenture so affected or
(ii) reduce the aforesaid percentage of Debentures, the holders of which are
required to consent to any such supplemental indenture, without the consent of
the holders of all Debentures then out-

<PAGE>

standing.  It is also provided in the Indenture that the holders of a majority
in aggregate principal amount of the Debentures at the time outstanding may on
behalf of the holders of all of the Debentures waive any past default or Event
of Default under the Indenture and its consequences except a default in the
payment of interest or any premium on or the principal of any of the Debentures,
a default in the payment of redemption price pursuant to Article III or
repurchase price pursuant to Article XV or a failure by the Company to convert
any Debentures into Common Stock of the Company.  Any such consent or waiver by
the holder of this Debenture (unless revoked as provided in the Indenture) shall
be conclusive and binding upon such holder and upon all future holders and
owners of this Debenture and any Debentures which may be issued in exchange or
substitute hereof, irrespective of whether or not any notation thereof is made
upon this Debenture or such other Debentures.

     The indebtedness evidenced by the Debentures is, to the extent and in the
manner provided in the Indenture, expressly subordinate and subject in right of
payment to the prior payment in full of all Senior Indebtedness of the Company,
as defined in the Indenture, whether outstanding at the date of the Indenture or
thereafter incurred, and this Debenture is issued subject to the provisions of
the Indenture with respect to such subordination.  Each holder of this
Debenture, by accepting the same, agrees to and shall be bound by such
provisions and authorizes the Trustee on his behalf to take such action as may
be necessary or appropriate to effectuate the subordination so provided and
appoints the Trustee his attorney-in-fact for such purpose.

     No reference herein to the Indenture and no provision of this Debenture or
of the Indenture shall alter or impair the obligation of the Company, which is
absolute and unconditional, to pay the principal of and any premium and interest
on this Debenture at the place, at the respective times, at the rate and in the
coin or currency herein prescribed.

     Interest on the Debentures shall be computed on the basis of a 360-day year
comprised of twelve 30-day months.

     The Debentures are issuable in registered form without coupons in
denominations of $1,000 and any integral multiple of $1,000.  At the office or
agency of the Company referred to on the face hereof, and in the manner and
subject to the limitations provided in the Indenture, without payment of any
service charge but with payment of a sum sufficient to cover any tax or other
governmental charge that may be imposed in connection with any registration or
exchange of Debentures, Debentures may be exchanged for a like aggregate
principal amount of Debentures of other authorized denominations.

<PAGE>
          The Debentures will not be redeemable at the option of the Company
prior to _____, 1999.  At any time on or after _____, 1999, and prior to
maturity the Debentures may be redeemed at the option of the Company as a whole,
or from time to time in part, upon mailing a notice of such redemption not less
than 30 nor more than 60 days before the date fixed for redemption to the
holders of Debentures at their last registered addresses, all as provided in the
Indenture, at the following optional redemption prices (expressed as percentages
of the principal amount), together in each case with accrued interest to, but
excluding, the date fixed for redemption.

     If redeemed during the 12-month period beginning ______________:

                                          Redemption
               Year                          Price
               ----                          -----
               1999. . . . . . . . . . . .   ___.___%
               2000. . . . . . . . . . . .   ___.___%
               2001. . . . . . . . . . . .   ___.___%
               2002. . . . . . . . . . . .   ___.___%
               2003 and thereafter . . . .   100.000%

provided that any semi-annual payment of interest becoming due on the date fixed
for redemption shall be payable to the holders of record on the relevant record
date of the Debentures being redeemed.

     The Debentures are not subject to redemption through the operation of any
sinking fund.

     If a Change in Control (as defined in the Indenture) occurs, the holder of
this Debenture shall have the right, in accordance with the provisions of the
Indenture, to require the Company to repurchase this Debenture or any portion of
the principal amount hereof that is an integral multiple of $1,000 for cash at a
Repurchase Price equal to 100% of the principal amount plus accrued and unpaid
interest to, but excluding, the Repurchase Date; PROVIDED that if such
Repurchase Date is ___________ or ___________, then the interest payable on such
date shall be paid to the holder of record of the Debenture on the next
preceding ___________ or _____________, respectively.  Within 15 days after the
occurrence of a Change in Control, the Company is obligated to give all holders
of record of Debentures notice of the occurrence of such Change in Control and
of the repurchase right arising as a result thereof.

     Subject to the provisions of the Indenture, the holder hereof has the
right, at its option, at any time after 60 days following the latest date of
original issuance of the Debentures

<PAGE>

and prior to the close of business on ___________, 2006, or, as to all or any
portion hereof called for redemption, prior to the close of business on the
Business Day immediately preceding the date fixed for redemption (unless the
Company shall default in payment due upon redemption thereof), to convert the
principal hereof or any portion of such principal which is $1,000 or an integral
multiple thereof, into that number of shares of Company's Common Stock, as said
shares shall be constituted at the date of conversion, obtained by dividing the
principal amount of this Debenture or portion thereof to be converted by the
Conversion Price of $_____ or such Conversion Price as adjusted from time to
time as provided in the Indenture, upon surrender of this Debenture, together
with a conversion notice as provided in the Indenture, to the Company at the
office or agency of the Company maintained for that purpose in
The City of New York, or at the option of such holder, the Corporate
Trust Office, and, unless the shares issuable on conversion are to be issued in
the same name as this Debenture, duly endorsed by, or accompanied by instruments
of transfer in form satisfactory to the Company duly executed by, the holder or
by his duly authorized attorney.  No adjustment in respect of interest or divi-
dends will be made upon any conversion; PROVIDED, HOWEVER, that if this
Debenture shall be surrendered for conversion during the period from the close
of business on any record date for the payment of interest to the close of
business on the Business Day preceding the interest payment date, this Debenture
(unless it or the portion being converted shall have been called for redemption
during the period from the close of business on any record date for the payment
of interest to the close of business on the Business Day preceding the interest
payment date) must be accompanied by an amount, in New York Clearing House funds
or other funds acceptable to the Company, equal to the interest payable on such
interest payment date on the principal amount being converted.  No fractional
shares will be issued upon any conversion, but an adjustment in cash will be
made, as provided in the Indenture, in respect of any fraction of a share which
would otherwise be issuable upon the surrender of any Debenture or Debentures
for conversion.

     Any Debentures called for redemption, unless surrendered for conversion on
or before the close of business on the date fixed for redemption, may be deemed
to be purchased from the holder of such Debentures at an amount equal to the
applicable redemption price, together with accrued interest to the date fixed
for redemption, by one or more investment bankers or other purchasers who may
agree with the Company to purchase such Debentures from the holders thereof and
convert them into Common Stock of the Company and to make payment for such
Debentures as aforesaid to the Trustee in trust for such holders.

     Upon due presentment for registration of transfer of this Debenture at the
office or agency of the Company in

<PAGE>

The City of New York, or at the option of the holder of
this Debenture, at the Corporate Trust Office, a new Debenture or Debentures of
authorized denominations for an equal aggregate principal amount will be issued
to the transferee in exchange thereof, subject to the limitations provided in
the Indenture, without charge except for any tax or other governmental charge
imposed in connection therewith.

     The Company, the Trustee, any authenticating agent, any Paying Agent, any
Conversion Agent and any Debenture registrar may deem and treat the registered
holder hereof as the absolute owner of this Debenture (whether or not this
Debenture shall be overdue and notwithstanding any notation of ownership or
other writing hereon), for the purpose of receiving payment hereof, or on
account hereof, for the conversion hereof and for all other purposes, and
neither the Company nor the Trustee nor any other authenticating agent nor any
Paying Agent nor any other Conversion Agent nor any Debenture registrar shall be
affected by any notice to the contrary.  All payments made to or upon the order
of such registered holder shall, to the extent of the sum or sums paid, satisfy
and discharge liability for monies payable on this Debenture.

     No recourse for the payment of the principal of or any premium or interest
on this Debenture, or for any claim based hereon or otherwise in respect hereof,
and no recourse under or upon any obligation, covenant or agreement of the
Company in the Indenture or any indenture supplemental thereto or in any Deben-
ture, or because of the creation of any indebtedness represented thereby, shall
be had against any incorporator, stockholder, employee, agent, officer or
director or subsidiary, as such, past, present or future, of the Company or of
any successor corporation, either directly or through the Company or any
successor corporation, whether by virtue of any constitution, statute or rule of
law or by the enforcement of any assessment or penalty or otherwise, all such
liability being, by the acceptance hereof and as part of the consideration for
the issue hereof, expressly waived and released.

     Terms used in this Debenture and defined in the Indenture are used herein
as therein defined.

<PAGE>

                                  ABBREVIATIONS


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

<TABLE>
<S><C>

TEN COM -           as tenants in common             UNIF GIFT MIN ACT-- ______  Custodian ______
TEN ENT -           as tenants by the                                    (Cust.)           (Minor)
                    entireties                             under Uniform Gifts to Minors Act
JT TEN -            as joint tenants
                    with right of
                    survivorship and not             --------------------------------------
                    as tenants in common                              (State)


</TABLE>
                    Additional abbreviations may also be used
                          though not in the above list.

<PAGE>


                                  CONVERSION NOTICE


To: ALZA CORPORATION


    The undersigned registered owner of this Debenture hereby irrevocably
exercises the option to convert this Debenture, or the portion hereof (which is
$1,000 or an integral multiple thereof) below designated, into shares of Common
Stock of ALZA Corporation in accordance with the terms of the Indenture referred
to in this Debenture, and directs that the shares issuable and deliverable upon
such conversion, together with any check in payment for fractional shares and
any Debentures representing any unconverted principal amount hereof, be issued
and delivered to the registered holder hereof unless a different name has been
indicated below.  If shares or any portion of this Debenture not converted are
to be issued in the name of a person other than the undersigned, the undersigned
will check the appropriate box below and pay all transfer taxes payable with
respect thereto.  Any amount required to be paid to the undersigned on account
of interest accompanies this Debenture.


Dated:
      --------------



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


                        -----------------------------------------------------
                        Signature(s)

    Signature(s) must be guaranteed by an eligible Guarantor Institution
    (banks, stockbrokers, savings and loan associations and credit unions)
    with membership in an approved signature guarantee medallion program
    pursuant to Securities and Exchange Commission Rule 17Ad-15 if shares of
    Common Stock are to be issued, or Debentures to be delivered, other than
    to and in the name of the registered holder.



                        -----------------------------------------------------
                        Signature Guarantee


<PAGE>

Fill in for registration of
shares of Common Stock if
to be issued, and Debentures
if to be delivered, other
than to and in the name of
the registered holder:


- -------------------------
(Name)


- -------------------------
(Street Address)


- -------------------------
(City, State and Zip Code)

Please print name and address

                             Principal amount to be converted
                             (if less than all): $________


                             ------------------------------------------------
                             Social Security or Other Taxpayer Identification
                             Number


<PAGE>

                              OPTION TO ELECT REPURCHASE
                               UPON A CHANGE IN CONTROL


To: ALZA CORPORATION


    The undersigned registered owner of this Debenture hereby irrevocably
acknowledges receipt of a notice from ALZA Corporation (the "Company") as to the
occurrence of a Change in Control with respect to the Company and requests and
instructs the Company to repay the entire principal amount of this Debenture, or
the portion thereof (which is $1,000 or an integral multiple thereof) below
designated, in accordance with the terms of the Indenture referred to in this
Debenture at the repurchase price, together with accrued interest to, but
excluding, such date, to the registered holder hereof.


Dated:
      --------------         ------------------------------------------------


                             ------------------------------------------------
                             Signature(s)

                             NOTICE:  The above signatures of the holder(s)
                             hereof must correspond with the name as written
                             upon the face of the Debenture in every
                             particular without alteration or enlargement or
                             any change whatever.

                             Principal amount to be repurchased
                             (if less than all): $________


                             ------------------------------------------------
                             Social Security or Other Taxpayer Identification
                             Number


<PAGE>

                                  TABLE OF CONTENTS


ARTICLE I DEFINITIONS. . . . . . . . . . . . . . . . . . . . . . . . . . .    1

    Section 1.1  Definitions . . . . . . . . . . . . . . . . . . . . . . .    1

         Affiliate . . . . . . . . . . . . . . . . . . . . . . . . . . . .    1
         Board of Directors. . . . . . . . . . . . . . . . . . . . . . . .    1
         Business Day. . . . . . . . . . . . . . . . . . . . . . . . . . .    1
         Cash or cash. . . . . . . . . . . . . . . . . . . . . . . . . . .    2
         Commission. . . . . . . . . . . . . . . . . . . . . . . . . . . .    2
         Common Stock. . . . . . . . . . . . . . . . . . . . . . . . . . .    2
         Company . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    2
         Company Order . . . . . . . . . . . . . . . . . . . . . . . . . .    2
         Corporate Trust Office. . . . . . . . . . . . . . . . . . . . . .    2
         Debenture or Debentures . . . . . . . . . . . . . . . . . . . . .    2
         Debentureholder or Holder . . . . . . . . . . . . . . . . . . . .    2
         Default . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    2
         Exchange Act. . . . . . . . . . . . . . . . . . . . . . . . . . .    2
         Event of Default. . . . . . . . . . . . . . . . . . . . . . . . .    3
         Indenture . . . . . . . . . . . . . . . . . . . . . . . . . . . .    3
         Officer . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    3
         Officers' Certificate . . . . . . . . . . . . . . . . . . . . . .    3
         Opinion of Counsel. . . . . . . . . . . . . . . . . . . . . . . .    3
         Over-Allotment Option . . . . . . . . . . . . . . . . . . . . . .    3
         Person. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    3
         Predecessor Debenture . . . . . . . . . . . . . . . . . . . . . .    3
         Redemption Date . . . . . . . . . . . . . . . . . . . . . . . . .    4
         Redemption Price. . . . . . . . . . . . . . . . . . . . . . . . .    4
         Responsible Officer . . . . . . . . . . . . . . . . . . . . . . .    4
         Securities Act. . . . . . . . . . . . . . . . . . . . . . . . . .    4
         Senior Indebtedness . . . . . . . . . . . . . . . . . . . . . . .    4
         Subsidiary. . . . . . . . . . . . . . . . . . . . . . . . . . . .    5
         Trust Indenture Act . . . . . . . . . . . . . . . . . . . . . . .    5
         Trust Officer . . . . . . . . . . . . . . . . . . . . . . . . . .    5
         Trustee . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    5
         Underwriter . . . . . . . . . . . . . . . . . . . . . . . . . . .    5

    Section 1.2  Other Definitions . . . . . . . . . . . . . . . . . . . .    5
    Section 1.3  Incorporation by Reference of Trust
                 Indenture Act . . . . . . . . . . . . . . . . . . . . . .    6
    Section 1.4  Rules of Construction . . . . . . . . . . . . . . . . . .    6

ARTICLE II THE DEBENTURES. . . . . . . . . . . . . . . . . . . . . . . . .    7

    Section 2.1  Form and Dating . . . . . . . . . . . . . . . . . . . . .    7
    Section 2.2  Execution and Authentication. . . . . . . . . . . . . . .    7
    Section 2.3  Registrar, Paying Agent and
                 Conversion Agent. . . . . . . . . . . . . . . . . . . . .    8
    Section 2.4  Paying Agent To Hold Assets in Trust. . . . . . . . . . .    8


                                          i

<PAGE>
    Section 2.5  Debentureholder Lists . . . . . . . . . . . . . . . . . .    9
    Section 2.6  Transfer and Exchange . . . . . . . . . . . . . . . . . .    9
    Section 2.7  Replacement Debentures. . . . . . . . . . . . . . . . . .   10
    Section 2.8  Outstanding Debentures;
                 Determinations of Holders' Action . . . . . . . . . . . .   11
    Section 2.9  Temporary Debentures. . . . . . . . . . . . . . . . . . .   12
    Section 2.10 Cancellation. . . . . . . . . . . . . . . . . . . . . . .   12

ARTICLE III REDEMPTION . . . . . . . . . . . . . . . . . . . . . . . . . .   13

    Section 3.1  Right to Redeem; Notices to Trustee . . . . . . . . . . .   13
    Section 3.2  Selection of Debentures
                 to Be Redeemed. . . . . . . . . . . . . . . . . . . . . .   13
    Section 3.3  Notice of Redemption. . . . . . . . . . . . . . . . . . .   14
    Section 3.4  Effect of Notice of Redemption. . . . . . . . . . . . . .   14
    Section 3.5  Deposit of Redemption Price . . . . . . . . . . . . . . .   15
    Section 3.6  Debentures Redeemed in Part.. . . . . . . . . . . . . . .   15
    Section 3.7  Conversion Arrangement on Call
                 for Redemption. . . . . . . . . . . . . . . . . . . . . .   15

ARTICLE IV SUBORDINATION OF DEBENTURES . . . . . . . . . . . . . . . . . .   16

    Section 4.1  Debentures Subordinate to
                 Senior Indebtedness . . . . . . . . . . . . . . . . . . .   16
    Section 4.2  Payment Over of Proceeds
                 Upon Dissolution. . . . . . . . . . . . . . . . . . . . .   16
    Section 4.3  Prior Payment of Senior Indebtedness
                 Upon Acceleration of Debentures . . . . . . . . . . . . .   18
    Section 4.4  No Payment When Senior Indebtedness
                 in Default. . . . . . . . . . . . . . . . . . . . . . . .   18
    Section 4.5  Payment Permitted If No Default . . . . . . . . . . . . .   19
    Section 4.6  Subrogation to Rights of Holders
                 of Senior Indebtedness. . . . . . . . . . . . . . . . . .   19
    Section 4.7  Provisions Solely to Define Relative
                 Rights. . . . . . . . . . . . . . . . . . . . . . . . . .   20
    Section 4.8  Trustee to Effectuate Subordination . . . . . . . . . . .   20
    Section 4.9  No Waiver of Subordination
                 Provisions. . . . . . . . . . . . . . . . . . . . . . . .   21
    Section 4.10 Notice to Trustee . . . . . . . . . . . . . . . . . . . .   21
    Section 4.11 Reliance on Judicial Order or
                 Certificate of Liquidating Agent. . . . . . . . . . . . .   22
    Section 4.12 Trustee Not Fiduciary for
                 Holders of Senior Indebtedness. . . . . . . . . . . . . .   22
    Section 4.13 Rights of Trustee as Holder of Senior
                 Indebtedness; Preservation of
                 Trustee's Rights. . . . . . . . . . . . . . . . . . . . .   22
    Section 4.14 Article Applicable to Paying Agents . . . . . . . . . . .   22
    Section 4.15 Certain Conversions Deemed Payment. . . . . . . . . . . .   23

ARTICLE V PARTICULAR COVENANTS OF THE COMPANY. . . . . . . . . . . . . . .   23

    Section 5.1  Payment of Principal, Premium


                                          ii

<PAGE>

                 and Interest. . . . . . . . . . . . . . . . . . . . . . .   23
    Section 5.2  Maintenance of Office or Agency . . . . . . . . . . . . .   24
    Section 5.3  Appointments to Fill Vacancies in
                 Trustee's Office. . . . . . . . . . . . . . . . . . . . .   24
    Section 5.4  Corporate Existence . . . . . . . . . . . . . . . . . . .   24
    Section 5.5  Stay, Extension and Usury Laws. . . . . . . . . . . . . .   24
    Section 5.6  Compliance Certificate. . . . . . . . . . . . . . . . . .   25
    Section 5.7  SEC Reports . . . . . . . . . . . . . . . . . . . . . . .   25

ARTICLE VI DEFAULTS AND REMEDIES . . . . . . . . . . . . . . . . . . . . .   25

    Section 6.1  Events of Default . . . . . . . . . . . . . . . . . . . .   25
    Section 6.2  Payments of Debentures on Default;
                 Suit Therefor . . . . . . . . . . . . . . . . . . . . . .   28
    Section 6.3  Application of Monies Collected by
                 Trustee . . . . . . . . . . . . . . . . . . . . . . . . .   30
    Section 6.4  Proceedings by Debentureholder. . . . . . . . . . . . . .   31
    Section 6.5  Proceedings by Trustee. . . . . . . . . . . . . . . . . .   31
    Section 6.6  Remedies Cumulative and Continuing. . . . . . . . . . . .   32
    Section 6.7  Direction of Proceedings and Waiver
                 of Defaults by Majority of
                 Debentureholders. . . . . . . . . . . . . . . . . . . . .   32
    Section 6.8  Undertaking to Pay Costs. . . . . . . . . . . . . . . . .   33

ARTICLE VII TRUSTEE. . . . . . . . . . . . . . . . . . . . . . . . . . . .   33

    Section 7.1  Duties of Trustee . . . . . . . . . . . . . . . . . . . .   33
    Section 7.2  Rights of Trustee . . . . . . . . . . . . . . . . . . . .   35
    Section 7.3  Individual Rights of Trustee. . . . . . . . . . . . . . .   35
    Section 7.4  Trustee's Disclaimer. . . . . . . . . . . . . . . . . . .   36
    Section 7.5  Notice of Defaults. . . . . . . . . . . . . . . . . . . .   36
    Section 7.6  Reports by Trustee to Holders . . . . . . . . . . . . . .   36
    Section 7.7  Compensation and Indemnity. . . . . . . . . . . . . . . .   36
    Section 7.8  Replacement of Trustee. . . . . . . . . . . . . . . . . .   37
    Section 7.9  Successor Trustee by Merger . . . . . . . . . . . . . . .   38
    Section 7.10 Eligibility; Disqualification . . . . . . . . . . . . . .   38
    Section 7.11 Preferential Collection of Claims
                 Against Company . . . . . . . . . . . . . . . . . . . . .   39

ARTICLE VIII CONCERNING THE DEBENTUREHOLDERS . . . . . . . . . . . . . . .   39

    Section 8.1  Action by Debentureholders. . . . . . . . . . . . . . . .   39
    Section 8.2  Proof of Execution by
                 Debentureholders. . . . . . . . . . . . . . . . . . . . .   39
    Section 8.3  Who Are Deemed Absolute Owners. . . . . . . . . . . . . .   40
    Section 8.4  Revocation of Consents;
                 Future Holders Bound. . . . . . . . . . . . . . . . . . .   40

ARTICLE IX DEBENTUREHOLDERS' MEETINGS. . . . . . . . . . . . . . . . . . .   40

    Section 9.1  Purpose of Meetings . . . . . . . . . . . . . . . . . . .   40
    Section 9.2  Call of Meetings by Trustee . . . . . . . . . . . . . . .   41


                                         iii

<PAGE>

    Section 9.3  Call of Meetings by Company or
                 Debentureholders. . . . . . . . . . . . . . . . . . . . .   41
    Section 9.4  Qualifications for Voting . . . . . . . . . . . . . . . .   42
    Section 9.5  Regulations . . . . . . . . . . . . . . . . . . . . . . .   42
    Section 9.6  Voting. . . . . . . . . . . . . . . . . . . . . . . . . .   42
    Section 9.7  No Delay of Rights by Meeting . . . . . . . . . . . . . .   43

ARTICLE X SUPPLEMENTAL INDENTURES. . . . . . . . . . . . . . . . . . . . .   43

    Section 10.1  Supplemental Indentures without
                  Consent of Debentureholders. . . . . . . . . . . . . . .   43
    Section 10.2  Supplemental Indentures with Consent of
                  Debentureholders . . . . . . . . . . . . . . . . . . . .   45
    Section 10.3  Effect of Supplemental Indenture . . . . . . . . . . . .   46
    Section 10.4  Notation on Debentures . . . . . . . . . . . . . . . . .   46
    Section 10.5  Evidence of Compliance of Supplemental
                  Indenture to Be Furnished Trustee. . . . . . . . . . . .   46

ARTICLE XI CONSOLIDATION, MERGER, SALE, CONVEYANCE
          AND LEASE. . . . . . . . . . . . . . . . . . . . . . . . . . . .   46

    Section 11.1  Company May Consolidate Etc. on
                  Certain Terms. . . . . . . . . . . . . . . . . . . . . .   46
    Section 11.2  Successor Corporation to Be
                  Substituted. . . . . . . . . . . . . . . . . . . . . . .   47
    Section 11.3  Opinion of Counsel to Be Given
                  Trustee. . . . . . . . . . . . . . . . . . . . . . . . .   48

ARTICLE XII SATISFACTION AND DISCHARGE OF INDENTURE. . . . . . . . . . . .   48

    Section 12.1  Discharge of Indenture . . . . . . . . . . . . . . . . .   48
    Section 12.2  Deposited Monies to Be Held in
                  Trust by Trustee . . . . . . . . . . . . . . . . . . . .   49
    Section 12.3  Paying Agent to Repay Monies Held. . . . . . . . . . . .   49
    Section 12.4  Return of Unclaimed Monies . . . . . . . . . . . . . . .   49
    Section 12.5  Reinstatement. . . . . . . . . . . . . . . . . . . . . .   49

ARTICLE XIII IMMUNITY OF INCORPORATORS, STOCKHOLDERS,
             OFFICERS AND DIRECTORS. . . . . . . . . . . . . . . . . . . .   50

    Section 13.1  Indenture and Debentures Solely
                  Corporate Obligations. . . . . . . . . . . . . . . . . .   50

ARTICLE XIV CONVERSION OF DEBENTURES . . . . . . . . . . . . . . . . . . .   50

    Section 14.1  Right to Convert . . . . . . . . . . . . . . . . . . . .   50
    Section 14.2  Exercise of Conversion Privilege;
                  Issuance of Common Stock on
                  Conversion; No Adjustment for
                  Interest or Dividends. . . . . . . . . . . . . . . . . .   51
    Section 14.3  Cash Payments in Lieu of Fractional


                                          iv

<PAGE>


                  Shares . . . . . . . . . . . . . . . . . . . . . . . . .   52
    Section 14.4  Conversion Price . . . . . . . . . . . . . . . . . . . .   53
    Section 14.5  Adjustment of Conversion Price . . . . . . . . . . . . .   53
    Section 14.6  Effect of Reclassification,
                  Consolidation, Merger or Sale. . . . . . . . . . . . . .   63
    Section 14.7  Taxes on Shares Issued . . . . . . . . . . . . . . . . .   64
    Section 14.8  Reservation of Shares; Shares to Be
                  Fully Paid; Compliance with Governmental
                  Requirements; Listing of Common Stock. . . . . . . . . .   64
    Section 14.9  Responsibility of Trustee. . . . . . . . . . . . . . . .   65
    Section 14.10 Notice to Holders Prior to Certain
                  Actions. . . . . . . . . . . . . . . . . . . . . . . . .   66

ARTICLE XV REPURCHASE OF DEBENTURES AT OPTION OF
          THE HOLDER UPON CHANGE IN CONTROL. . . . . . . . . . . . . . . .   67

    Section 15.1  Right to Require Repurchase. . . . . . . . . . . . . . .   67
    Section 15.2  Notices; Method of Exercising
                  Repurchase Right, Etc. . . . . . . . . . . . . . . . . .   67
    Section 15.3  Certain Definitions. . . . . . . . . . . . . . . . . . .   69
    Section 15.4  Change in Control. . . . . . . . . . . . . . . . . . . .   70
    Section 15.5  Consolidation, Merger, Etc.. . . . . . . . . . . . . . .   70

ARTICLE XVI MISCELLANEOUS PROVISIONS . . . . . . . . . . . . . . . . . . .   71

    Section 16.1  Successors . . . . . . . . . . . . . . . . . . . . . . .   71
    Section 16.2  Official Acts by Successor
                  Corporation. . . . . . . . . . . . . . . . . . . . . . .   71
    Section 16.3  Notices. . . . . . . . . . . . . . . . . . . . . . . . .   71
    Section 16.4  Governing Law. . . . . . . . . . . . . . . . . . . . . .   72
    Section 16.5  Certificate and Opinion as to
                  Conditions Precedent . . . . . . . . . . . . . . . . . .   72
    Section 16.6  Statements Required in Certificate
                  or Opinion.. . . . . . . . . . . . . . . . . . . . . . .   72
    Section 16.7  Legal Holidays . . . . . . . . . . . . . . . . . . . . .   73
    Section 16.8  Trust Indenture Act Controls . . . . . . . . . . . . . .   73
    Section 16.9  No Security Interest Created . . . . . . . . . . . . . .   73
    Section 16.10 Benefits of Indenture. . . . . . . . . . . . . . . . . .   73
    Section 16.11 Table of Contents, Headings, Etc.. . . . . . . . . . . .   73
    Section 16.12 Authenticating Agent . . . . . . . . . . . . . . . . . .   73
    Section 16.13 Separability Clause. . . . . . . . . . . . . . . . . . .   75
    Section 16.14 Rules By Trustee, Paying Agent,
                  Conversion Agent and Registrar . . . . . . . . . . . . .   75
    Section 16.15 No Recourse Against Others . . . . . . . . . . . . . . .   75
    Section 16.16 Execution in Counterparts. . . . . . . . . . . . . . . .   75


                                          v

<PAGE>

- - - - - - - - - - - - - - - - COMPARISON OF FOOTNOTES
- - - - - - - - - - - - - - - -

- -FOOTNOTE * -
 $460,000,000 if the Over-Allotment Option is exercised in full.


- - - - - - - - - - - - - - - - COMPARISON OF FOOTERS - - - - - - - - - - - - - -

- -FOOTER 1 -
0038247.06 - San Francisco Server la Draft April 4, 1996 - 8:18 pm


                                          vi

<PAGE>


                                                                     Exhibit 5.1

                                  April 8, 1996


                                                                      10034-0086




ALZA Corporation
950 Page Mill Road
Palo Alto, California  94303-0802

                       REGISTRATION STATEMENT ON FORM S-3

Ladies and Gentlemen:

          We have acted as counsel to ALZA Corporation, a Delaware corporation
("ALZA"), in connection with the Registration Statement on Form S-3 to be filed
with the Securities and Exchange Commission on or about April 8, 1996 (the
"Registration Statement"), relating to $460,000,000 principal amount of
Convertible Subordinated Debentures Due 2006 (the "Debentures"), including the
shares of Common Stock issuable upon conversion thereof (the "Shares") at the
initial Conversion Price defined in the form of Indenture included as Exhibit
4.2 to the Registration Statement (the "Indenture"), all as disclosed in the
Registration Statement.

                                       I.

          We have assumed the authenticity of all records, documents and
instruments submitted to us as originals, the genuineness of all signatures, the
legal capacity of all natural persons and the conformity to the originals of all
records, documents and instruments submitted to us as copies.  We have based our
opinion upon the following records, documents, instruments and certificates and
such additional certificates relating to factual matters as we have deemed
necessary or appropriate for our opinion:

<PAGE>

ALZA Corporation
April 8, 1996                                                             Page 2



               (a)  The Certificate of Incorporation of ALZA, certified by the
                    Secretary of State of the State of Delaware as of April 3,
                    1996 and certified to us by an officer of ALZA as being
                    complete and in full force and effect as of the date of this
                    opinion;

               (b)  The Bylaws of ALZA certified to us by an officer of ALZA as
                    being complete and in full force and effect as of the date
                    of this opinion;

               (c)  Certifications by officers of ALZA (i) as to all of the
                    proceedings and actions of the Board of Directors of ALZA
                    relating to the Debentures and the Shares, and (ii) as to
                    certain other factual matters;

               (d)  The Registration Statement;

               (e)  The Indenture; and

               (f)  Certification by an officer of The First National Bank of
                    Boston, transfer agent for ALZA's Common Stock, as to
                    ceratin factual matters.

          We have assumed that the number of Shares issuable upon exercise of
the Debentures at the initial Conversion Price is less than 196,676,527, the
number of shares of Common Stock of ALZA, currently authorized but not
outstanding or otherwise reserved for issuance and that this number of shares of
Common Stock will be available for issuance at the time of conversion.

          This opinion is limited to the General Corporation Law of the State of
Delaware, and we disclaim any opinion as to the laws of any other jurisdiction.
We further disclaim any opinion as to any statute, rule, regulation, ordinance,
order or other promulgation of any regional or local governmental body or as to
any related judicial or administrative opinion.

<PAGE>

ALZA Corporation
April 8, 1996                                                             Page 3



          Based upon the foregoing and our examination of such questions of law
as we have deemed necessary or appropriate for the purpose of this opinion, and
assuming (i) that the full consideration for each Debenture and each Share as
stated in the Indenture and the Registration Statement is paid, and (ii) that
all applicable securities laws are complied with, it is our opinion that, when
issued and sold by ALZA, the Debentures and the Shares will be legally issued,
fully paid and nonassessable.

          This opinion is rendered to you in connection with the Registration
Statement and is solely for your benefit.  This opinion may not be relied upon
by any other person, firm, corporation or other entity without our prior written
consent.  We disclaim any obligation to advise you of any change of law that
occurs, or any facts of which we become aware, after the date of this opinion.

          We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement.

                                   Very truly yours,

                                   /s/ HELLER EHRMAN WHITE & McAULIFFE


<PAGE>

                                                                     Exhibit 8.1


                                  April 8, 1996


                                                                      10034-0086


ALZA Corporation
950 Page Mill Road
Palo Alto, California 94303

                       REGISTRATION STATEMENT ON FORM S-3

Ladies and Gentlemen:

     We have acted as United States federal income tax counsel to ALZA
Corporation, a Delaware corporation ("ALZA"), in connection with the
registration under the Securities Act of 1933, as amended, of $400,000,000
aggregate principal amount ($460,000,000 aggregate principal amount if the
Underwriter's over-allotment option is exercised) of Subordinated Convertible
Debentures Due 2006 (the "Debentures").  In that capacity, we have examined the
Registration Statement on Form S-3 (the "Registration Statement") to be filed by
ALZA with the Securities and Exchange Commission in connection with the proposed
public offering of the Debentures.

     We are of the opinion that the information in the Registration Statement
under the caption "Certain United States Federal Income Tax Considerations,"
while not purporting to discuss all tax consequences to persons acquiring the
Debentures, is correct in all material respects.

     The foregoing is based on the Internal Revenue Code of 1986, as amended
(the "Code"), Treasury Regulations (including proposed Treasury Regulations)
promulgated thereunder, rulings, official pronouncements and judicial decisions,
all as in effect on the date hereof and all of which are subject to change or
different interpretations by the Internal Revenue Service or the courts, which
change may have retroactive effect.  We disclaim any undertaking to advise you
of any change in the law that may

<PAGE>

ALZA Corporation
April 8, 1996                                                             Page 2



affect this opinion.  We express no opinion as to the laws of any jurisdictions
other than the federal income tax laws of the United States of America.

     We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement and further consent to the reference to our firm under
the caption "Legal Matters" in the Registration Statement and the Prospectus
which forms a part thereof.

                                        Very truly yours,

                                        /S/ HELLER EHRMAN WHITE & MCAULIFFE

<PAGE>
                                                                    EXHIBIT 12.1
 
               COMPUTATION OF RATIOS OF EARNINGS TO FIXED CHARGES
 
<TABLE>
<CAPTION>
                                                                        YEARS ENDED DECEMBER 31,
                                                       ----------------------------------------------------------
                                                          1995        1994        1993        1992        1991
                                                       ----------  ----------  ----------  ----------  ----------
                                                                     (IN THOUSANDS, EXCEPT RATIOS)
 
<S>                                                    <C>         <C>         <C>         <C>         <C>
Interest expense.....................................  $   23,453  $   19,379  $   19,204  $   17,538  $   16,156
Capitalized interest.................................       1,349         287       1,879       1,325       1,801
Amortization of debt issue expense...................         486         281         318         321         345
Estimated interest portion of rent expense...........         570         528         567         526         412
                                                       ----------  ----------  ----------  ----------  ----------
Fixed charges........................................  $   25,858  $   20,475  $   21,968  $   19,710  $   18,714
                                                       ----------  ----------  ----------  ----------  ----------
                                                       ----------  ----------  ----------  ----------  ----------
Income (loss) before income taxes, extraordinary
 refinancing charge and cumulative effect of
 accounting change...................................  $  116,787  $   93,290  $   65,953  $  105,455  $  (41,407)
Fixed charges........................................      25,858      20,475      21,968      19,710      18,714
Capitalized interest.................................      (1,349)       (287)     (1,879)     (1,325)     (1,801)
                                                       ----------  ----------  ----------  ----------  ----------
Earnings.............................................  $  141,296  $  113,478  $   86,042  $  123,840  $  (24,494)
                                                       ----------  ----------  ----------  ----------  ----------
                                                       ----------  ----------  ----------  ----------  ----------
Ratio of earnings to fixed charges...................        5.5x        5.5x        3.9x        6.3x      --
</TABLE>

<PAGE>
                                                                    EXHIBIT 23.1
 
               CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS
 
    We  consent to the reference to our  firm under the caption "Experts" in the
Registration Statement (Form S-3) and related Prospectus of ALZA Corporation for
the  registration  of   Convertible  Subordinated  Debentures   due  2006   (the
"Debentures")  and such indeterminate number of shares of Common Stock as may be
issuable upon conversion of the Debentures and to the incorporation by reference
therein of our reports dated February 16, 1996, with respect to the consolidated
financial statements of ALZA Corporation incorporated by reference in its Annual
Report (Form  10-K)  for  the year  ended  December  31, 1995  and  the  related
financial  statement schedule  included therein,  filed with  the Securities and
Exchange Commission.
 
                                                           /s/ Ernst & Young LLP
 
Palo Alto, California
April 8, 1996

<PAGE>


                        Securities Act of 1933 File No. _________
                        (If application to determine eligibility of trustee
                        for delayed offering  pursuant to  Section 305 (b) (2))
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

                          SECURITIES AND EXCHANGE COMMISSION
                                Washington, D.C. 20549
                                  __________________

                                       FORM T-1

            STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939
                    OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE

      CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTEE PURSUANT TO
                             SECTION 305(b)(2)___________

                                  __________________


                               THE CHASE MANHATTAN BANK
                                (NATIONAL ASSOCIATION)
                 (Exact name of trustee as specified in its charter)

                                      13-2633612
                       (I.R.S. Employer Identification Number)

                     1 CHASE MANHATTAN PLAZA, NEW YORK, NEW YORK
                      (Address of  principal executive offices)

                                        10081
                                      (Zip Code)
                                   ________________


                                   ALZA CORPORATION
                 (Exact  name of obligor as specified in its charter)

                                       DELAWARE
           (State or other jurisdiction of incorporation  or organization)

                                      77-0142070
                         (I.R.S. Employer Identification No.)

                                  950 PAGE MILL ROAD
                                    P.O. BOX 10950
                                    PALO ALTO, CA
                       (Address of principal executive offices)

                                      94303-0802
                                      (Zip Code)
                          __________________________________

                     SUBORDINATED CONVERTIBLE DEBENTURES DUE 2006
                         (Title of the indenture securities)

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

<PAGE>

ITEM 1.  GENERAL INFORMATION.

         Furnish the following information as to the trustee:

    (a)  Name and address of each examining or supervising  authority to which
         it is subject.

              Comptroller of the Currency, Washington, D.C.

              Board of Governors of The Federal Reserve System, Washington,
              D.C.

    (b)  Whether it is authorized to exercise  corporate trust powers.

              Yes.

ITEM 2.  AFFILIATIONS WITH THE OBLIGOR.

              If the obligor is an affiliate of the trustee, describe each such
              affiliation.

              The Trustee is not the obligor, nor is the Trustee directly or
              indirectly controlling, controlled by, or under common control
              with the obligor.

              (See Note on Page 2.)

ITEM 16. LIST OF EXHIBITS.

    List below all exhibits filed as a part of this statement of eligibility.
    *1. -- A copy of the articles of association of the trustee as now in
            effect.  (See Exhibit T-1 (Item 12) , Registration No. 33-55626.)
    *2. -- Copies of the respective authorizations of The Chase Manhattan Bank
            (National Association) and The Chase Bank of New York (National
            Association) to commence business and a copy  of approval of merger
            of said corporations, all of which documents are still in
            effect.(See Exhibit T-1 (Item 12), Registration No. 2-67437.)
    *3. -- Copies of authorizations of The Chase Manhattan Bank  (National
            Association) to exercise corporate trust powers, both of which
            documents are still in effect.  (See Exhibit  T-1 (Item 12),
            Registration No. 2-67437).
    *4. -- A copy of the existing by-laws of the trustee.  (See Exhibit T-1
            (Item 16) (25.1), Registration  No. 33-60809.)
    *5. -- A copy of each indenture referred to in Item 4, if the obligor is in
            default. (Not applicable).
    *6. -- The  consents of United States institutional trustees required by
            Section 321(b) of the Act. (See Exhibit T-1, (Item 12),
            Registration No. 22-19019.)
     7. --  A copy of the latest report of condition of the trustee published
            pursuant to law or the requirements of its supervising or examining
            authority.
___________________


*The Exhibits thus designated are incorporated  herein by reference.  Following
the description of such Exhibits is  a reference to the copy of the Exhibit
heretofore filed with the Securities and Exchange Commission, to which there
have been no amendments or changes.

                                 ___________________

                                          1.

<PAGE>

                                         NOTE

    Inasmuch as this Form T-1 is filed prior to the ascertainment by the
trustee of all facts on which to base a responsive answer to Item 2 the answer
to said Item is based on incomplete information.

    Item 2 may, however, be considered as correct unless amended by an
amendment to this Form T-1.


                                      SIGNATURE

    Pursuant to the requirements of the Trust Indenture Act of 1939, the
trustee, The Chase Manhattan Bank (National Association), a corporation
organized and existing under  the laws of the United States of America, has duly
caused this statement of eligibility to be signed on its behalf by the
undersigned, thereunto duly authorized, all in the City of New York, and the
State of New York, on the 5th day April, 1996.


                                        THE CHASE MANHATTAN BANK
                                        (NATIONAL ASSOCIATION)


                                        By /s/TIMOTHY E. BURKE
                                         --------------------
                                            Timothy E. Burke
                                            Second Vice President

                                   _________________

                                          2.

<PAGE>

                                      EXHIBIT 7

REPORT OF CONDITION
Consolidating domestic and foreign subsidiaries of the
                            THE CHASE MANHATTAN BANK, N.A.
of New York in the State of New York, at the close of business on December 31,
1995, published in response to call made by Comptroller of the Currency, under
title 12, United States Code, Section 161.

<TABLE>
<CAPTION>

CHARTER NUMBER 2370                                           COMPTROLLER OF THE CURRENCY NORTHEASTERN DISTRICT

STATEMENT OF RESOURCES AND LIABILITIES
                                                 ASSETS                                                                THOUSANDS
                                                                                                                      OF DOLLARS
<S>                                                                                                <C>               <C>
Cash and balances due from depository institutions:
  Noninterest-bearing balances and currency and coin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     $ 5,574,000
  Interest-bearing balances. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       5,950,000
Held to maturity securities. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .               0
Available-for-sale securities. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       6,731,000
Federal funds sold and securities purchased under agreements to resell in domestic offices of the bank and of its
  Edge and Agreement subsidiaries, and in IBFs:
  Federal funds sold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       2,488,000
  Securities purchased under agreements to resell. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .          35,000
Loans and lease financing receivable:
  Loans and leases, net of unearned income . . . . . . . . . . . . . . . . . . . . . . . . . . . .  $ 57,786,000
  LESS: Allowance for loan and lease losses. . . . . . . . . . . . . . . . . . . . . . . . . . . .     1,114,000
  LESS:  Allocated transfer risk reserve . . . . . . . . . . . . . . . . . . . . . . . . . . . . .             0
                                                                                                    ------------
  Loans and leases, net of unearned income, allowance, and reserve . . . . . . . . . . . . . . . . . . . . . . .      56,672,000
Assets held in trading accounts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      12,994,000
Premises and fixed assets (including capitalized leases) . . . . . . . . . . . . . . . . . . . . . . . . . . . .       1,723,000
Other real estate owned. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         364,000
Investments in unconsolidated subsidiaries and associated companies. . . . . . . . . . . . . . . . . . . . . . .          28,000
Customers' liability to this bank on acceptances outstanding . . . . . . . . . . . . . . . . . . . . . . . . . .         944,000
Intangible assets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       1,343,000
Other assets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       5,506,000
                                                                                                                       ---------
TOTAL ASSETS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    $100,352,000
                                                                                                                    ------------
                                                                                                                    ------------

                                            LIABILITIES

Deposits:
  In domestic offices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    $ 32,483,000
     Noninterest-bearing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $  13,704,000
     Interest-bearing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    18,779,000
                                                                                                      ----------
  In foreign offices, Edge and Agreement subsidiaries, and IBFs. . . . . . . . . . . . . . . . . . . . . . . . .      37,639,000
     Noninterest-bearing     . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $   3,555,000 
     Interest-bearing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    34,084,000
                                                                                                   -------------
Federal funds purchased and securities sold under agreements to repurchase in domestic offices of the bank and
  of its Edge and Agreement subsidiaries, and in IBFs:
  Federal funds purchased. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       1,572,000
  Securities sold under agreements to repurchase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         211,000
Demand notes issued to the U.S. Treasury . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .          25,000
Trading liabilities. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       9,146,000
Other borrowed money:
  With original maturity of one year or less . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       2,562,000
  With original maturity of more than one year . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         379,000
Mortgage indebtedness and obligations under capitalized leases . . . . . . . . . . . . . . . . . . . . . . . . .          40,000
Bank's liability on acceptances executed and outstanding . . . . . . . . . . . . . . . . . . . . . . . . . . . .         949,000
Subordinated notes and debentures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       1,960,000
Other liabilities. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       5,411,000
                                                                                                                       ---------
TOTAL LIABILITIES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      92,377,000
                                                                                                                      ----------
Limited-life preferred stock and related surplus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .               0

                                           EQUITY CAPITAL

Perpetual preferred stock and related surplus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .               0
Common stock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         921,000
Surplus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       5,285,000
Undivided profits and capital reserves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       1,751,000
Net unrealized holding gains (losses) on available-for-sale securities . . . . . . . . . . . . . . . . . . . . .           7,000
Cumulative foreign currency translation adjustments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .          11,000
                                                                                                                          ------
TOTAL EQUITY CAPITAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       7,975,000
                                                                                                                       ---------
TOTAL LIABILITIES, LIMITED-LIFE PREFERRED STOCK,
  AND EQUITY CAPITAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   $ 100,352,000
                                                                                                                   -------------
                                                                                                                   -------------

</TABLE>
I, Lester J. Stephens, Jr., Senior Vice President and Controller of the above
named bank do hereby declare that this Report of Condition is true and correct
to the best of my knowledge and belief.  (Signed) Lester J. Stephens, Jr.

We the undersigned directors, attest to the correctness of this statement of
resources and liabilities.  We declare that it has been examined by us, and to
the best of our knowledge and belief has been prepared in conformance with the
instructions and is true and correct.

(Signed) Thomas G. Labrecque
(Signed) Donald Trautlein                     Directors
(Signed) Richard J. Boyle



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