MCKESSON CORP
S-4, 1998-06-11
DRUGS, PROPRIETARIES & DRUGGISTS' SUNDRIES
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<PAGE>
 
     As filed with the Securities and Exchange Commission on June 11, 1998
                                                    Registration No. 333-      
                                                    ======================
                                        

                       SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C.  20549
                            -----------------------
                                        
                                    FORM S-4
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                              --------------------

<TABLE>
<S>                         <C>                               <C>
McKesson Corporation                 Delaware                    94-3207296
(Exact name of                   (State or other              (I.R.S.  employer
 Registrant as                   jurisdiction of              identification number)
specified in its charter)        incorporation or
                                  organization)
</TABLE>
                                  McKesson Plaza
                                 One Post Street
                          San Francisco, California  94104

(Address, including zip code, and telephone number, including area code, of
Registrant's principal executive offices)

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

                                Nancy A. Miller
                     Vice President and Corporate Secretary
                              McKesson Corporation
                        McKesson Plaza, One Post Street
                        San Francisco, California  94104
                                 (415) 983-8300
 (Name, address, including zip code, and telephone number, including area code,
 of agent for service)
                                -------------- 

                                   Copies to:
<TABLE>
<CAPTION>
<S>                                               <C> 

          Ivan D. Meyerson                        Gregg A. Noel
 Vice President and General Counsel       Skadden, Arps, Slate, Meagher
        McKesson Corporation                        & Flom LLP
   McKesson Plaza, One Post Street      300 South Grand Avenue, Suite 3400
   San Francisco, California 94104        Los Angeles, California  90071
          (415) 983-8300                         (213) 687-5000
 
</TABLE>

     Approximate date of commencement of proposed sale to the public:  From time
to time after this registration statement becomes effective.
     If the only securities being registered on this form are being offered
pursuant to dividend or interest reinvestment plans, please check the following
box. [_]

     If any of the securities being registered on this form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other than securities being offered only in connection with dividend or
interest reinvestment plans, please check the following box. [X]

     If this form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement 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, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [_]

     If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box. [X]
<PAGE>
 
<TABLE> 
<CAPTION> 

                        CALCULATION OF REGISTRATION FEE
=======================================================================================================================


                                                                Proposed Maximum    Proposed Maximum    Amount of
          Title of Each Class of               Amount to be      Offering Price        Aggregate       Registration
       Securities to be Registered           Registered(1)(2)     Per Share (1)      Offering Price        Fee
- -----------------------------------------------------------------------------------------------------------------------
<S>                                          <C>                <C>                 <C>                <C>
Common Stock, par value $0.01 per share...       5,000,000               $76.59          $382,950,000   $112,971.00 
Rights to Purchase Preferred Stock(2).....
- -----------------------------------------------------------------------------------------------------------------------
</TABLE>

(1)  Pursuant to Rule 457(c), the registration fee is calculated based on the
     average of the high and low prices for the Common Stock, as reported on The
     New York Stock Exchange on June 3, 1998.
(2)  Associated with the Common Stock are rights to purchase Series A Junior
     Participating Preferred Stock of McKesson Corporation (the "Series A
     Preferred Stock") that will not be exercisable or evidenced separately from
     the Common Stock prior to the occurrence of certain events.  No separate
     consideration will be received by the Company for the initial issuance of
     the rights to purchase the Series A Preferred Stock.

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 THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE 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 STATE.
*******************************************************************************


                   SUBJECT TO COMPLETION, DATED JUNE 11, 1998



PROSPECTUS


                                5,000,000 SHARES
                                        
                              MCKESSON CORPORATION

                                  COMMON STOCK
                          (PAR VALUE $0.01 PER SHARE)
                             --------------------

     This Prospectus relates to 5,000,000 shares (the "Shares") of common stock,
par value $0.01 per share (the "Common Stock"), of McKesson Corporation
("McKesson" or the "Company" ) which may be offered and issued from time to time
in connection with one or more business combinations with the Company or its
subsidiaries.  The Shares may be issued from time to time in connection with (i)
mergers, consolidations, recapitalizations or similar plans of acquisition; (ii)
purchases of some or all of the assets of one or more businesses; and (iii)
exchanges for some or all of the outstanding securities, obligations or other
interests of one or more businesses, including, among other things, capital
stock, loans and partnership interests.

     The Company anticipates that the specific terms of each such business
combination in which Shares will be issued will be the result of negotiations
with the owners and controlling persons of the businesses, assets, securities or
other interests involved in the business combination.  The Shares so issued will
generally be valued (i) at prices based on or related to market  prices for the
Common Stock at or near the time the Company agrees to the terms of such
business combination or the time of closing, during the period or periods prior
to delivery of such Shares, or based on average market prices for periods ending
at or near such times or (ii) such other basis as the parties may agree.  No
underwriting discounts or commission will be paid in connection with such
business combinations, however, brokers' and finders' fees may be paid from time
to time with respect to specific business combinations.  Any person receiving
such fees may be deemed an underwriter within the meaning of the Securities Act
of 1933, as amended (the "Securities Act").

     The Shares  will,  prior to their issuance, be listed on the New York Stock
Exchange, Inc. ("NYSE")and the Pacific Exchange, Inc. (the "PE") subject to
official notice of issuance.  The Common Stock is traded under the symbol "MCK."
The last reported sale price of the Common Stock on the NYSE on June 10, 1998
was $80 5/16 per share.



     SEE "RISK FACTORS" BEGINNING ON PAGE 4 OF THIS PROSPECTUS FOR A DESCRIPTION
OF CERTAIN RISKS TO BE CONSIDERED IN CONNECTION WITH AN INVESTMENT IN THE
SHARES.
                              --------------------



  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.
                              --------------------



                 The date of this Prospectus is June __, 1998.
<PAGE>
 
                             AVAILABLE INFORMATION

     The Company 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 filed by the Company with the Commission can be
inspected and copied at the Commission's Public Reference Room at 450 Fifth
Street, N.W., Washington, D.C.  20549, or at the public reference facilities of
the regional offices in Chicago and New York.  The addresses of these regional
offices are as follows: 500 West Madison Street, Chicago, Illinois 60661, and 7
World Trade Center, 13th Floor, New York, New York 10048.  Copies of such
material also can be obtained from the Public Reference Section of the
Commission at 450 Fifth Street, N.W., Washington D.C.  20549, at prescribed
rates.  The Commission also maintains a World Wide Web site that contains
reports, proxy and information statements and other information regarding
registrants (including McKesson) that file electronically with the Commission
(at http://www.sec.gov).  The Common Stock is listed on each of the NYSE and the
PE.  Reports, proxy statements, and other information concerning the Company may
also be inspected at the offices of the NYSE  at 20 Broad Street, New York, New
York 10005 and at the offices of the PE at 301 Pine Street, San Francisco,
California 94104.

     The Company has filed with the Commission a Registration Statement on Form
S-4  (together with all amendments and exhibits thereto, the "Registration
Statement") under the Securities Act with respect to the securities offered by
this Prospectus. This Prospectus does not contain all the information set forth
in the Registration Statement. In addition, certain documents filed by the
Company with the Commission have been incorporated into this Prospectus by
reference. See "Incorporation of Certain Documents by Reference." Statements
contained herein concerning the provisions of any such document do not purport
to be complete and, in each instance, are qualified in all respects by reference
to the copy of such document filed as an exhibit to the Registration Statement
or otherwise filed with the Commission. Each such statement is subject to and
qualified in its entirety by such reference. For further information about the
Company and the securities offered hereby, please read the Registration
Statement, any applicable Prospectus Supplement, and the documents incorporated
herein and therein by reference.

                                       2
<PAGE>
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE


     There are hereby incorporated by reference in the Prospectus the following
documents previously filed by the Company with the Commission pursuant to the
Exchange Act:

          1.  Annual Report on Form 10-K for the fiscal year ended March 31,
     1997, filed on June 19, 1997.

          2.  Quarterly Reports on Form 10-Q for the quarters ended June 30,
     1997, filed on August 13, 1997, September 30, 1997, filed on November 7,
     1997 and December 31, 1997, filed on February 11, 1998.

          3.  Current Reports on Form 8-K filed on November 22, 1996 (as amended
     by Amendment No. 1 on Form 8-K/A, filed on January 21, 1997, and as further
     amended by Amendment No.  2 on Form 8-K/A filed on April 28, 1997), April
     7, 1997, June 13, 1997, June 24, 1997, September 5, 1997, September 24,
     1997, October 31, 1997, February 24, 1998 and March 19, 1998.

     All documents filed by the Company 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 in the Prospectus and to be part hereof from the
date 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 which
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.

     THIS PROSPECTUS INCORPORATES BY REFERENCE DOCUMENTS WHICH ARE NOT PRESENT
HEREIN OR DELIVERED HEREWITH. THE COMPANY WILL PROVIDE WITHOUT CHARGE TO EACH
PERSON, INCLUDING ANY BENEFICIAL OWNER TO WHOM THIS PROSPECTUS IS DELIVERED,
UPON THE WRITTEN OR ORAL REQUEST OF SUCH PERSON, A COPY OF ANY AND ALL OF THE
INFORMATION THAT HAS BEEN INCORPORATED BY REFERENCE IN THE PROSPECTUS (NOT
INCLUDING EXHIBITS TO THE INFORMATION THAT IS INCORPORATED BY REFERENCE UNLESS
SUCH EXHIBITS ARE SPECIFICALLY INCORPORATED BY REFERENCE INTO THE INFORMATION
THAT THIS PROSPECTUS INCORPORATES).  REQUESTS FOR SUCH DOCUMENTS SHALL BE
DIRECTED TO NANCY A. MILLER, VICE PRESIDENT AND CORPORATE SECRETARY, MCKESSON
CORPORATION, MCKESSON PLAZA, ONE POST STREET, SAN FRANCISCO, CALIFORNIA 94104
(TELEPHONE (415) 983-8300).

               SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

     Certain of the matters discussed under the captions "Risk Factors,"
"Financial Review,""The Company" and elsewhere in this Prospectus or in the
information incorporated by reference herein may constitute forward-looking
statements within the meaning of Section 27A of the Securities Act and Section
21E of the Exchange Act.  Certain of such forward-looking statements can be
identified by the use of forward-looking terminology such as, "believes,"
"expects," "may," "will," "should," "seeks," "approximately," "intends,"
"plans," "estimates," or "anticipates" or the negative thereof or other
comparable terminology, or by discussions of financial trends, strategy, plans
or intentions. Forward-looking statements involve risks and uncertainties that
could cause actual results to differ materially from those projected.  These
include the speed of integration of acquired businesses, the impact of continued
competitive pressures, success of strategic initiatives, implementation of new
technologies, continued industry consolidation, changes in customer mix, changes
in pharmaceutical manufacturers' pricing and distribution policies, the changing
United States health care environment and other factors discussed herein or
incorporated by reference herein.

                                       3
<PAGE>
 
                                  THE COMPANY

     McKesson is the leading health care supply management company in North
America.  The Company also develops and manages innovative marketing programs
for pharmaceutical manufacturers and, through McKesson Water Products Company
("Water Products"), is engaged in the processing, delivery and sale of bottled
drinking water.

     The Company's objective is to become the world leader in health care supply
and comprehensive pharmaceutical management across the entire supply chain, from
manufacturer to patient.  The Company conducts its operations through two
operating business segments:  the Health Care Services segment and Water
Products segment.

     The principal executive offices of the Company are located at McKesson
Plaza, One Post Street, San Francisco, California 94104, and the telephone
number is (415) 983-8300.


                                  RISK FACTORS

RISKS GENERALLY ASSOCIATED WITH ACQUISITIONS

     An element of the Company's growth strategy is to pursue strategic
acquisitions that either expand or complement its business, and McKesson
routinely reviews such potential acquisition opportunities.  Acquisitions
involve a number of special risks, including the diversion of management's
attention to the assimilation of the operations from other business concerns,
difficulties in the integration of operations and systems, delays or
difficulties in opening and operating larger distribution centers in an
integrated distribution network, the assimilation and retention of the personnel
of the acquired companies, challenges in retaining the customers of the combined
businesses and potential adverse short-term effects on operating results.  In
addition, the Company may require additional debt or equity financing for future
acquisitions, which may not be available on terms favorable to the Company, if
at all. The inability of the Company to successfully finance, complete and
integrate strategic acquisitions in a timely manner could have an adverse impact
on the Company's results of operations and its ability to effect a portion of
its growth strategy.


CHANGING UNITED STATES HEALTH CARE ENVIRONMENT

     In recent years, the health care industry has undergone significant change
driven by various efforts to reduce costs, including potential national health
care reform, trends toward managed care, cuts in Medicare, consolidation of
pharmaceutical and medical/surgical supply distributors, and the development of
large, sophisticated purchasing groups.  This industry is expected to continue
to undergo significant changes for the foreseeable future.  Other healthcare
industry factors that could have a material adverse effect on the Company's
results of operations include: (i) changes in governmental support of health
care services, the method by which such services are delivered or the prices for
such services; (ii) other legislation or regulations governing such services or
mandated benefits; or (iii) changes in pharmaceutical manufacturers' pricing or
distribution policies.


COMPUTER TECHNOLOGIES

     McKesson relies heavily on computer technologies to operate its business.
McKesson has conducted an assessment of its computer systems and has begun to
make the changes necessary to make its computer systems Year 2000 compliant.
McKesson believes that with modifications to or replacements of its existing
computer-based systems, it will be Year 2000 compliant by March 31, 1999,
although the Company cannot provide any assurance in this regard. McKesson's
systems rely in part on the computer-based systems of its trading partners. As
part of the Company's assessment, an overview of certain of its trading
partners'

                                       4
<PAGE>
 
Year 2000 compliance strategies is being performed, and the Company plans to
conduct extensive systems testing with such trading partners during calendar
1999. Nevertheless, if any trading partner or other entity upon which they rely
failed to become Year 2000 compliant, McKesson could be adversely affected. The
Company incurred approximately $7 million in fiscal 1998 and expects to incur
between $10 and $15 million in each of the next two fiscal years in costs
associated with modifications to the Company's existing systems to make them
Year 2000 compliant and related testing, including planned testing with trading
partners. Such costs are being expensed as incurred. Year 2000 project costs are
difficult to estimate accurately, and the projected costs could change due to
unanticipated technological difficulties, project vendor delays, and project
vendor cost overruns. 

                               ACQUISITION TERMS

     The Shares may be issued from time to time in connection with (i) mergers,
consolidations, recapitalizations or similar plans of acquisition; (ii)
purchases of some or all of the assets of one or more businesses; and (iii)
exchanges for some or all of the outstanding securities, obligations and other
interests of one or more businesses, including, among other things, capital
stock, loans and partnership interests.

     The Company anticipates that the specific terms of each business
combination in which Shares will be issued will be the result of negotiations
with the owners and controlling persons of the businesses, assets, securities or
other interests involved in the business combination.  The Shares so issued will
generally be valued at prices based on or related to market prices for the
Common Stock at or near the time the Company agrees to the terms of such
business combination or the time of closing, during the period or periods prior
to delivery of such Shares, or based on average market prices for periods ending
at or near such times or on such other basis as the parties may agree.  No
underwriting discounts or commission will be paid in connection with such
business combinations, however, brokers' and finders' fees may be paid from time
to time with respect to specific business combinations.  Any person receiving
such fees may be deemed an underwriter within the meaning of the Securities Act.


                          DESCRIPTION OF CAPITAL STOCK

     The following descriptions of the Company's capital stock and of certain
provisions of Delaware law do not purport to be complete and are subject to and
qualified in their entirety by reference to the Company's Restated Certificate
of Incorporation (the "Certificate") and Restated By-Laws (the "By-Laws") and
Delaware law, and, with respect to certain rights of holders of shares of Common
Stock, the Rights Agreement (as hereinafter defined).  Copies of such documents
have been filed with the Commission and are filed as exhibits to the
Registration Statement of which this Prospectus is a part.

     As of the date hereof, the capital stock of the Company consists of
200,000,000 authorized shares of Common Stock and 100,000,000 authorized shares
of Series Preferred Stock, par value $0.01 per share (the "Preferred Stock").


COMMON STOCK

     As of June 1, 1998, there were 94,929,952 shares of Common Stock issued and
outstanding.

     The holders of outstanding shares of Common Stock are entitled to receive
dividends out of assets legally available therefor at such times and in such
amounts as the Company's Board of Directors (the "Board") may from time to time
determine.  The shares of Common Stock are neither redeemable nor convertible,
and  do not provide the holders thereof with any preemptive or subscription
rights to purchase any securities of the Company.  Upon liquidation, dissolution
or winding up of the Company, the holders of Common Stock are entitled to
receive the assets

                                       5
<PAGE>
 
of the Company which are legally available for distribution, after payment of
all debts, other liabilities and any liquidation preferences of outstanding
Preferred Stock. Each outstanding share of Common Stock is entitled to one vote
on all matters submitted to a vote of stockholders. There is no cumulative
voting.

     In February 1997, McKesson Financing Trust issued an aggregate of 4,123,720
5% Trust Convertible Preferred Securities (each, a "Trust Security").  Each
Trust Security is convertible into Common Stock at any time prior to the close
of business on the business day prior to June 1, 2027 (or prior to the date of
redemption of the Trust Security), at the option of the holder, at the rate of
1.3418 shares of Common Stock for each Trust Security (equivalent to a
conversion price of $37.26 per share of Common Stock), subject to adjustment in
certain circumstances.


PREFERRED STOCK

     As of  the date hereof, there were no shares of  Preferred Stock issued and
outstanding.  The Board is authorized to issue the Preferred Stock in classes or
series and to fix the designations, preferences, qualifications, limitations, or
restrictions of any class or series with respect to the rate and nature of
dividends, the price and terms and conditions on which shares may be redeemed,
the amount payable in the event of voluntary or involuntary liquidation, the
terms and conditions for conversion or exchange into any other class or series
of the stock, voting rights and other terms.  Of the Preferred Stock, 10,000,000
shares have been designated Series A Junior Participating Preferred Stock (the
"Series A Preferred Stock")  and reserved for issuance pursuant to the Company's
Rights Agreement.


ANTI-TAKEOVER EFFECTS OF PROVISIONS OF THE COMPANY'S RESTATED CERTIFICATE OF
INCORPORATION AND BY-LAWS

     The Certificate and By-Laws of the Company contain certain provisions that
may be deemed to have an anti-takeover effect and may delay, deter or prevent a
tender offer or takeover attempt that a stockholder might consider to be in the
stockholder's best interest, including those takeover attempts that might result
in a premium over the market price for the shares held by stockholders.

     Pursuant to the Certificate, the Board is divided into three classes
serving staggered three-year terms. Directors can be removed from office only
for cause and only by the affirmative vote of the holders of at least a majority
of the voting power of the then outstanding shares of any class or series of
capital stock of the Company entitled to vote generally in the election of
directors.  Vacancies and newly created directorships on the Board may be filled
only by a majority of the remaining directors or by the plurality vote of the
stockholders.

     The Certificate also provides that any action required or permitted to be
taken by the holders of Common Stock may be effected only at an annual or
special meeting of such holders, and that stockholders may act in lieu of such
meetings only by unanimous written consent.  The By-Laws provide that special
meetings of holders of Common Stock may be called only by the Chairman or the
President of the Company or the Board.  Holders of Common Stock are not
permitted to call a special meeting or to require that the Board call a special
meeting of stockholders.

     The By-Laws establish an advance notice procedure for the nomination, other
than by or at the direction of the Board, of candidates for election as
directors as well as for other stockholder proposals to be considered at annual
meetings of stockholders.  In general, notice of intent to nominate a director
or raise business at such meetings must be received by the Company not less than
60 nor more than 90 days prior to the date of the annual meeting and must
contain certain specified information concerning the person to be nominated or
the matters to be brought before the meeting and concerning the stockholder
submitting the proposal.

     The Certificate also provides that certain provisions of the By-Laws may
only be amended by the affirmative vote of the holders of 75% of the shares of
the Company outstanding and entitled to vote.  The Certificate also provides
that, in addition to any affirmative vote required by law, the affirmative vote
of holders of 80% of the voting stock of

                                       6
<PAGE>
 
the Company and two-thirds of the voting stock other than voting stock held by
an interested stockholder shall be necessary to approve certain business
combinations proposed by an interested stockholder.

     The foregoing summary is qualified in its entirety by the provisions of the
Certificate and By-Laws, copies of which have been filed with the Commission.


RIGHTS PLAN

     Pursuant to the Company's Rights Agreement, the Board declared a dividend
distribution of one right (a "Right") for each outstanding share of Common Stock
to stockholders of record of the Company at November 1, 1994 (the "Record
Date"). As a result of the two-for-one stock split effective January 2, 1998,
each share of Common Stock has attached to it one-half of a Right.  Each Right
entitles the registered holder to purchase from the Company a unit consisting of
one one-hundredth of a share of Series A Preferred Stock at a purchase price of
$100 per unit.  The Rights expire on October 21, 2004, unless redeemed earlier
by the Board.  The terms of the Rights are set forth in a Rights Agreement
between the Company and a Rights Agent (the "Rights Agreement"), a copy of which
is filed with the Commission.  The following summary outlines certain provisions
of the Rights Agreement and is qualified by reference to the full text of the
form of the Rights Agreement.

     The Rights are attached to all Common Stock certificates representing
shares outstanding at the Record Date and shares issued between the Record Date
and the Distribution Date (as hereinafter defined), and no separate rights
certificates (the "Rights Certificates") have been distributed.  The Rights will
separate from the Common Stock, separate Rights Certificates will be issued and
a distribution date (the "Distribution Date") will occur upon the earlier to
occur of (i) ten business days (or such later date as the Board may determine)
following the date of a public announcement that there is an Acquiring Person
(as defined below) (such date, the "Stock Acquisition Date"), (ii) ten business
days following commencement of a tender or exchange offer that would result in
the offeror beneficially owning 15% or more of the Common Stock or (iii) ten
business days after the Board determines that the ownership of 10% or more of
the Company's outstanding Common Stock by a person is (A) intended to cause the
Company to repurchase the Common Stock beneficially owned by such person or (B)
is causing, or is reasonably likely to cause, a material adverse impact on the
Company.

     The term "Acquiring Person" means any person who, together with affiliates
and associates, acquires beneficial ownership of shares of Common Stock
representing 15% or more of the Common Stock, but shall not include the Company,
any subsidiary of the Company, any employee benefit plan of the Company or of
any subsidiary of the Company, or any person or entity organized, appointed or
established by the Company for or pursuant to the terms of such plan.

     In the event that a person becomes an Acquiring Person (except pursuant to
an offer for all outstanding shares of Common Stock which the independent
directors determine to be fair to and otherwise in the best interests of the
Company and its stockholders), each holder of a Right will thereafter have the
right to receive, upon exercise, Common Stock (or, in certain circumstances,
cash, property or other securities of the Company) having a calculated value
equal to two times the exercise price of the Right.  Notwithstanding the
foregoing, following the occurrence of such event, all Rights that are, or
(under certain circumstances specified in the Rights Agreement) were,
beneficially owned by an Acquiring Person and certain related persons and
transferees will be null and void.  However, Rights are not exercisable
following the occurrence of such event until such time as the Rights are no
longer redeemable as set forth below.

     At any time prior to the tenth day following the Stock Acquisition Date,
the Company may redeem the Rights, in whole, but not in part, at a price of $.01
per Right.

     Until a Right is exercised, the holder thereof, as such, will have no
rights as a stockholder of the Company, including without limitation, the right
to vote or to receive dividends.

                                       7
<PAGE>
 
     In general, the Rights Agreement may be amended by the Board (i) prior to
the Distribution Date in any manner, and (ii) on or after the Distribution Date
in certain respects including (a) to shorten or lengthen at any time period and
(b) in a manner not adverse to the interests of Rights holders.  However,
amendments extending the redemption period must be made while the Rights are
still redeemable.

     The Rights have certain anti-takeover effects and will cause substantial
dilution to a person or group that attempts to acquire the Company on terms not
approved by the Board.  The Rights should not interfere with any merger or other
business combination approved by the Board, since the Board may redeem the
Rights as provided above.


SECTION 203 OF DELAWARE GENERAL CORPORATION LAW

     The Company is subject to the "business combination" statute of the
Delaware General Corporation Law (Section 203).  In general, such statute
prohibits a publicly held Delaware corporation from engaging in a "business
combination" with any "interested stockholder" for a period of three years after
the date of the transaction in which the person became an "interested
stockholder," unless (i) such transaction is approved by the board of directors
prior to the date the interested stockholder obtains such status, (ii) upon
consummation of such transaction, the "interested stockholder" beneficially
owned at least 85% of the voting stock of the corporation outstanding at the
time the transaction commenced, excluding for purposes of determining the number
of shares outstanding those shares owned by (a) persons who are directors and
also officers and (b) employee stock plans in which employee participants do not
have the right to determine confidentially whether shares held subject to the
plan will be tendered in a tender or exchange offer, or (iii) the "business
combination" is approved by the board of directors and authorized at an annual
or special meeting of stockholders by the affirmative vote of at least 66 2/3%
of the outstanding voting stock which is not owned by the "interested
stockholder." A "business combination" includes mergers, asset sales and other
transactions resulting in financial benefit to the "interested stockholder." An
"interested stockholder" is a person who, together with affiliates and
associates, owns (or within three years, did own) beneficially 15% or more of a
corporation's voting stock. The statute could prohibit or delay mergers or other
takeover or change in control attempts with respect to the Company and,
accordingly, may discourage attempts to acquire the Company.


CERTAIN EFFECTS OF AUTHORIZED BUT UNISSUED STOCK

     The Company's authorized but unissued shares of Common Stock and Preferred
Stock may be issued without additional stockholder approval and may be utilized
for a variety of corporate purposes, including future offerings to raise
additional capital or to facilitate corporate acquisitions.

     The issuance of Preferred Stock could have the effect of delaying or
preventing a change in control of the Company.  The issuance of Preferred Stock
could decrease the amount of earnings and assets available for distribution to
the holders of Common Stock or could adversely affect the rights and powers,
including voting rights, of the holders of the Common Stock.  In certain
circumstances, such issuance could have the effect of decreasing the market
price of the Common Stock.

     One of the effects of the existence of unissued and unreserved Common Stock
or Preferred Stock may be to enable the Board to issue shares to persons
friendly to current management which could render more difficult or discourage
an attempt to obtain control of the Company by means of a merger, tender offer,
proxy contest or otherwise, and thereby protect the continuity of management.
Such additional shares also could be used to dilute the stock ownership of
persons seeking to obtain control of the Company.

     The Company has reserved for issuance shares of Common Stock for (i) the 
Company's stock option and other employee benefit plans, (ii) the conversion
of the Trust Securities, and (iii) for the pending acquisition of AmeriSource
Health Corporation.  The

                                       8
<PAGE>
 
Company does not currently have any plans to issue shares of Preferred Stock,
although 10,000,000 shares have been designated Series A Preferred Stock
pursuant to the Company's Rights Agreement.


LIMITATION OF DIRECTORS LIABILITY

     The Certificate contains a provision that limits the liability of the
Company's directors for monetary damages for breach of fiduciary duty as a
director to the fullest extent permitted by the Delaware General Corporation
Law. Such limitation does not, however, affect the liability of a director (i)
for any breach of the director's duty of loyalty to the Company or its
stockholders, (ii) for acts or omissions not in good faith or that involve
intentional misconduct or a knowing violation of law, (iii) in respect of
certain unlawful dividend payments or stock redemptions or purchases, and (iv)
for any transaction from which the director derives an improper personal
benefit.  The effect of this provision is to eliminate the rights of the Company
and its stockholders (through stockholders' derivative suits on behalf of the
Company) to recover monetary damages against a director for breach of the
fiduciary duty of care as a director (including breaches resulting from
negligent or grossly negligent behavior) except in the situations described in
clauses (i) through (iv) above.  This provision does not limit or eliminate the
rights of the Company or any stockholder to seek non-monetary relief such as an
injunction or rescission in the event of a breach of a director's duty of care.
In addition, the directors and officers of the Company have indemnification
protection.


                                 LEGAL MATTERS

      Unless otherwise indicated in the applicable Prospectus Supplement, the
validity of the Shares will be passed upon for McKesson by Ivan D.  Meyerson,
Vice President and General Counsel of McKesson, and by Skadden, Arps, Slate,
Meagher & Flom LLP, Los Angeles, California.


                                    EXPERTS

     The consolidated financial statements of the Company and the related
financial statement schedule incorporated in this Registration Statement by
reference from the Company's Annual Report on Form 10-K for the fiscal year
ended March 31, 1997 and the consolidated financial statements of  FoxMeyer for
the year ended March 31, 1996 incorporated in this Registration Statement by
reference from McKesson's Current Report on Form 8-K/A filed with the Commission
on April 28, 1997 have been audited by Deloitte & Touche LLP, independent
auditors, as stated in their reports incorporated herein by reference (which
report dated May 16, 1997 on McKesson's consolidated financial statements
expresses an unqualified opinion and which report on FoxMeyer's consolidated
financial statements dated June 28, 1996 (March 18, 1997 as to paragraph seven
of Note Q), expresses an unqualified opinion and includes an explanatory
paragraph relating to the sale of the principal assets of FoxMeyer and its
Chapter 7 bankruptcy filing). Such consolidated financial statements and
financial statement schedule have been so incorporated in reliance upon the
reports of such firm given upon their authority as experts in auditing and
accounting.

                                       9
<PAGE>
 
                        ================================


NO DEALER, SALESMAN, OR OTHER INDIVIDUAL HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO 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 THE COMPANY OR ANY UNDERWRITER, DEALER, OR AGENT. 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 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 ANY IMPLICATION THAT THERE HAS
NOT BEEN ANY CHANGE IN THE FACTS SET FORTH IN THIS PROSPECTUS OR IN THE AFFAIRS
OF THE COMPANY SINCE THE DATE HEREOF.


                               __________________


                               TABLE OF CONTENTS



                                                                            PAGE
                                                                            ----
                                   Prospectus


Available Information                                                         2
Incorporation of Certain Documents by Reference                               3
Special Note Regarding Forward-Looking Statements                             3
The Company                                                                   4
Risk Factors                                                                  4 
Acquisition Terms                                                             5
Description of Capital Stock                                                  5
Legal Matters                                                                 9
Experts                                                                       9 




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



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



 

                                5,000,000 SHARES
 

 
                              McKESSON CORPORATION



                                  COMMON STOCK
                          (PAR VALUE $0.01 PER SHARE)
                                        



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

                                   PROSPECTUS

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



                                 June __, 1998



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

                                       10
<PAGE>
 
                PART II.  INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 20.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.

     Article VIII of the Restated By-Laws of the Company (the "Bylaws"),  in
accordance with the provisions of Section 145 of the General Corporation Law of
Delaware (the "Delaware Corporation Law"), provides that the Company shall
indemnify any person in connection with any threatened, pending or completed
legal proceeding (other than a legal proceeding by or in the right of the
Company) by reason of the fact that such person is or was a director or officer
of the Company or is or was serving at the request of the Company as a director,
officer, employee or agent of another corporation, partnership or other
enterprise against expenses (including attorneys' fees), judgments, fines and
amounts paid in settlement actually and reasonably incurred in connection with
such legal proceeding if such person acted in good faith and in a manner that
such person reasonably believed to be in or not opposed to the best interests of
the Company, and, with respect to any criminal action or proceeding, if such
person had no reasonable cause to believe that his or her conduct was unlawful.
If the legal proceeding is by or in the right of the Company, the director or
officer may be indemnified by the Company against expenses (including attorneys'
fees) actually and reasonably incurred in connection with the defense or
settlement of such legal proceeding if such person acted in good faith and in a
manner such person reasonably believed to be in or not opposed to the best
interests of the Company, except that such person may not be indemnified in
respect of any claim, issue or matter as to which such person shall have been
adjudged to be liable to the Company unless a court determines otherwise.

     Article VIII of the Company's By-Laws allows the Company to maintain
director and officer liability insurance on behalf of any person who is or was a
director or officer of the Company or such person who serves or served as
director, officer, employee or agent of another corporation, partnership or
other enterprise at the request of the Company.

     Article VI of the Company's Restated Certificate of Incorporation, in
accordance with Section 102(b)(7) of the Delaware Corporation Law, provides that
no director of the Company shall be personally liable to the Company or its
stockholders for monetary damages for any breach of such director's fiduciary
duty as a director; provided, however, that such clause shall not apply to any
liability of a director (1) for any breach of such director's duty of loyalty to
the Company or its stockholders, (2) for acts or omissions that are not in good
faith or involve intentional misconduct or a knowing violation of the law, (3)
under Section 174 of the Delaware Corporation Law, or (4) for any transaction
from which the director derived an improper personal benefit.


ITEM 21.  LIST OF EXHIBITS.

Exhibit
- -------

3.1    Restated Certificate of Incorporation of the Company (Exhibit 3.1(1)).
3.2    Restated Bylaws of the Company as amended through May 30, 1997 (Exhibit
       3.1 (2)).
3.3    Rights Agreement, dated as of October 21, 1994, by and between the
       Company and First Chicago Trust Company of New York as Rights Agent
       (Exhibit 4.1(3)).
4.1    Indenture dated as of March 11, 19987 between the Company and The First
       National Bank of Chicago, dated as of March 11, 1997 (Exhibit 4.1(4)).
5.1*   Opinion of Skadden, Arps, Slate, Meagher & Flom LLP as to the legality of
       the securities being registered hereby.
23.1*  Consent of Skadden, Arps, Slate, Meagher & Flom LLP (included in Exhibit
       5.1).
23.2*  Independent Auditors' Consent
24*    Power of Attorney


                                     II-1
<PAGE>
 
_______

(1) Incorporated by reference to designated exhibit to the Company's Annual
    Report on Form 10-K for the fiscal year ended March 31, 1996, as amended by
    Amendment No. 1 on Form 10-K/A, filed on February 13, 1997, File No. 1-3252.
(2) Incorporated by reference to designated exhibit to the Company's Current
    Report on Form 8-K filed with the Commission on June 24, 1997, File No.
    1-3252.
(3) Incorporated by reference to designated exhibit to Amendment No. 3 to the
    Company's Registration Statement on Form 10 filed with the Commission on
    October 27, 1994, File No. 1-13252.
(4) Incorporated by reference to designated exhibit to the Company's
    Registration Statement on Form S-4 filed with the Commission on July 8,
    1997, File No. 333-30899.

_______
*    Filed herewith

ITEM 22.  UNDERTAKINGS.

     The undersigned registrant hereby undertakes:

     (a)(1)  To file, during any period in which offers or sales are being made,
     a post-effective amendment to this registration statement:

          (i)   To include any prospectus required by section 10(a)(3) of the
     Securities Act of 1933;

          (ii)  To reflect in the prospectus any facts or events arising after
     the effective date of this registration statement (or the most recent post-
     effective) amendment thereof) which, individually or in the aggregate,
     represent a fundamental change in the information set forth in the
     registration statement. Notwithstanding the foregoing, any increase or
     decrease in volume of securities offered (if the total dollar value of
     securities offered would not exceed that which was registered) and any
     deviation from the low or high end of the estimated maximum offering range
     may be reflected in the form of prospectus filed with the Commission
     pursuant to Rule 424(b) if, in the aggregate, the changes in volume and
     price represent no more than 20 percent change in the maximum aggregate
     offering price set forth in the "Calculation of Registration Fee" table in
     the effective Registration Statement;

          (iii) To include any material information with respect to the plan of
     distribution not previously disclosed in the registration statement or any
     material change to such information in the registration statement;

     provided, however, that paragraphs (a)(1)(i) and (a)(1)(ii) do not apply if
     the information required to be included in a post-effective amendment by
     those paragraphs is contained in periodic reports filed by the Company
     pursuant to section 13 or section 15(d) of the Securities Exchange Act of
     1934 that are incorporated by reference in the registration statement.

     (2)  That, for the purpose of determining any liability under the
     Securities Act of 1933, each such post-effective amendment shall be deemed
     to be a new registration statement relating to the securities offered
     therein, and the offering of such securities at the time shall be deemed to
     be the initial bona fide offering thereof.

     (3)  To remove from registration by means of a post-effective amendment any
     of the securities being registered which remain unsold at the termination
     of the offering.


                                     II-2
<PAGE>
 
     (b)  That, for purposes of determining any liability under the Securities
     Act of 1933, each filing of the Company's annual report pursuant to section
     13(a) or section 15(d) of the Securities Exchange Act of 1934 (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) that is
     incorporated by reference in this registration statement shall be deemed to
     be a new registration statement relating to the securities offered thereby,
     and for the offering of such securities at the time shall be deemed to be
     the initial bona fide offering thereof.

     (c)  Insofar as indemnification for liabilities arising under the
     Securities Act of 1933 may be permitted to directors, officers and
     controlling persons of the registrant pursuant to the provisions referred
     to in Item 15 of this registration statement, 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 of 1933 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 whether such indemnification by it is against
     public policy as expressed in the Securities Act of 1933 and will be
     governed by the final adjudication of such.

     (d) To deliver or cause to be delivered with the prospectus, to each person
     to whom the prospectus is sent or given, the latest annual report to
     security holders that is incorporated by reference in the prospectus and
     furnished pursuant to and meeting the requirements of Rule 14a-3 or 14c-3
     under the Securities Exchange Act of 1934; and, where interim financial
     information required to be presented by Article 3 of Regulation S-X is not
     set forth in the prospectus, to deliver or cause to be delivered to each
     person to whom the prospectus is given the latest quarterly report that is
     specifically incorporated by reference in the prospectus to provide such
     interim financial information.
 
     (e) (1)  That, prior to any public reoffering of the securities registered
     hereunder through use of a prospectus which is a part of this registration
     statement by any person or party who is deemed to be an underwriter within
     the meaning of Rule 145(c), the issuer undertakes that such reoffering
     prospectus will contain the information called for by the applicable
     registration form with respect to reofferings by persons who may be deemed
     underwriters, in addition to the information called for by the other items
     of the applicable form.

     (2)  That every prospectus (i) that is  filed pursuant to paragraph (e) (1)
     immediately preceding, or (ii) that purports to meet the requirements of
     section 10(a)(3) of the Act and is used in connection with an offering of
     securities subject to Rule 415, will be filed as a part of an amendment to
     the Registration Statement and will not be used until such amendment is
     effective, and that, for purposes of determining any liability under the
     Securities Act of 1933, each such post-effective amendment 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.

     (f)  To respond to requests for information that is incorporated by
     reference into the prospectus pursuant to Item 4, 10(b), 11 or 13 of this
     Form within one business day of receipt of such request, and to send the
     incorporated documents by first class mail or other equally prompt means.
     This includes information contained in documents filed subsequent to the
     effect date of the Registration Statement through the date of responding to
     the request.

     (g)  To supply by means of a post-effective amendment all information
     concerning a transaction, and the company being acquired involved therein,
     that was not the subject of and included in the registration statement when
     it became effective.

                                     II-3
<PAGE>
 
                                   SIGNATURES


     Pursuant to the requirements of the Securities Act of 1933, the Registrant
has duly caused this Registration Statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in the City of San Francisco, State of
California, on the 11th day of June, 1998.


                             McKESSON CORPORATION


                              By:                *
                                  --------------------------------------------
                                  Name:  Richard H. Hawkins
                                  Title: Vice President and Chief Financial
                                         Officer


     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 date indicated.

<TABLE>
<CAPTION>

        SIGNATURE                        TITLE                    DATE
        ---------                        -----                    ----
<S>                          <C>                              <C>
           *
- --------------------------   President and Chief Executive    June 11, 1998
Mark A. Pulido                    Officer and Director
                             (principal executive officer)
           *                 
- --------------------------         Vice President and         June 11, 1998
Richard H. Hawkins              Chief Financial Officer
                              (principal financial officer)
 
           *                           Controller             June 11, 1998
- --------------------------   (principal accounting officer)
Heidi E. Yodowitz

           *        
- --------------------------              Director              June 11, 1998
Mary G.F. Bitterman 

           *      
- --------------------------              Director              June 11, 1998
Tully M. Friedman 

           *                 
- --------------------------              Director              June 11, 1998
John M. Pietruski 


- --------------------------              Director              June 11, 1998 
David S. Pottruck


- --------------------------              Director              June 11, 1998  
Carl E. Reichardt

          *                 
- --------------------------             Director;              June 11, 1998
Alan Seelenfreund               Chairman of the Board

</TABLE> 
                                     II-4


<PAGE>
 
<TABLE> 


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

 
          *                            
- --------------------------              Director              June 11, 1998 
Jane E. Shaw

          *                           
- --------------------------
Robert H. Waterman, Jr.                 Director              June 11, 1998  

*By: /s/ Nancy A. Miller
    ----------------------  
       NANCY A. MILLER
      Attorney-in-fact
</TABLE>

                                     II-5



<PAGE>
 
                                                                     EXHIBIT 5.1




                              June 11, 1998


McKesson Corporation
McKesson Plaza
One Post Street
San Francisco, CA  94104

Ladies and Gentlemen:

          We have acted as special counsel to McKesson Corporation, a Delaware
corporation (the "Company"), in connection with the preparation of the
Registration Statement on Form S-4 No (such Registration Statement being
hereinafter referred to as the "Registration Statement") filed today by the
Company with the Securities and Exchange Commission (the "Commission") with
respect to the registration under the Securities Act of 1933, as amended (the
"Securities Act"), of 5,000,000 shares (the "Shares") of the Company's common
stock, $0.01 par value per share (and the associated rights to purchase and the
Series A Junior Participating Preferred Stock of the Company, collectively the
"Common Stock");
 
          This opinion is being furnished in accordance with the requirements of
Item 601(b)(5) of Regulation S-K under the Securities Act.

          In connection with this opinion, we have examined originals or copies,
certified or otherwise identified to our satisfaction, of (i) the Registration
Statement; (ii) a specimen certificate representing the Common Stock; (iii) the
Restated Certificate of Incorporation of the Company; (iv) the Restated By-Laws
of the Company; and (v)
<PAGE>
 
McKesson Corporation
June 11, 1998
Page 2
              
certain resolutions of the Board of Directors of the Company relating to the
transactions contemplated by the Registration Statement and related matters (the
"Resolutions"). We have also examined originals or copies, certified or
otherwise identified to our satisfac tion, of such other documents, certificates
and records as we have deemed necessary or appropriate as a basis for the
opinion set forth herein.

          In our examination, we have assumed the legal capacity of all natural
persons, the genuineness of all signatures, the authenticity of all documents
submitted to us as originals, the conformity to original documents of all
documents submitted to us as certified or photostatic copies and the
authenticity of the originals of such latter documents. In making our
examination of documents executed by parties other than the Company, we have
assumed that such parties had the power, corporate or other, to enter into and
perform all obligations thereunder and have also assumed the due authorization
by all requisite action, corporate or other, and execution and delivery by such
parties of such documents and the validity and binding effect thereof on such
parties.  As to any facts material to the opinion expressed herein which we did
not independently establish or verify, we have relied upon oral or written
statements and representations of officers and other representatives of the
Company and others.

          Members of our firm are admitted to the Bar of the State of
California, and we do not express any opinion as to the laws of any jurisdiction
other than the Delaware General Corporation Law.

          Based upon and subject to the foregoing, we are of the opinion that
when (i) the Shares are issued in accordance with the procedures set forth in
the Resolutions; (ii) the Registration Statement becomes effective; (iii) the
certificates representing the Shares in the form of the specimen certificate
examined by us have been manually signed by an authorized officer of the
transfer agent and registrar for the Common Stock and registered by such
transfer agent and registrar and delivered against receipt of the consideration
therefore as contemplated by the Registration Statement and any prospectus
supplemental relating thereto, the issuance of the Shares will have been duly
authorized, and the Shares will be validly issued, fully paid and non-
assessable.
<PAGE>
 
McKesson Corporation
June 11, 1998
Page 3
              
          We hereby consent to the filing of this opinion with the Commission as
an exhibit to the Registration Statement.  We also consent to the reference to
our firm under the caption "Legal Matters" in the Registration Statement.  In
giving this consent, we do not thereby admit that we are included in the
category of persons whose consent is required under Section 7 of the Securities
Act or the rules and regulations of the Commission.  This opinion is expressed
as of the date hereof, and we disclaim any under  taking to advise you of any
subsequent changes in the facts stated or assumed herein or of any subsequent
changes in applicable law.


                         Very truly yours,



                         Skadden, Arps, Slate, Meagher &
                         Flom LLP

<PAGE>
 
                                                                    Exhibit 23.2


                         INDEPENDENT AUDITORS' CONSENT

We consent to the incorporation by reference in this Registration Statement of
McKesson Corporation ("McKesson") on Form S-4 of our report dated May 16, 1997
on McKesson's consolidated financial statements and consolidated supplemen  tary
financial schedule, both such reports, appearing in the Annual Report on Form
10-K of McKesson Corporation for the year ended March 31, 1997, and our report
on FoxMeyer Corporation's consolidated financial statements dated June 28, 1996
(March 18, 1997 as to paragraph seven of Note Q), which report expresses an
unqualified opinion and includes an explanatory paragraph relating to the sale
of the principal assets of FoxMeyer Corporation and its Chapter 7 bankruptcy
filing, appearing in the Current Report on Form 8-K/A of McKesson Corporation
filed with the Securities and Exchange Commission on April 28, 1997.

We also consent to the reference to us under the heading "Experts" in such
Registra  tion Statement.

/s/ Deloitte & Touche LLP
San Francisco, California
Dallas, Texas

June 10, 1998

<PAGE>
 
                                                                      Exhibit 24

                               POWER OF ATTORNEY


          Each of the undersigned directors and each of the undersigned officers
of McKesson Corporation, a Delaware corporation (the "Corporation"), does hereby
constitute and appoint Ivan D. Meyerson and Nancy A. Miller, and each of them,
as his or her true and lawful attorneys-in-fact and agents, with full power of
substitution and resubstitution, for him or her and in his or her name, place
and stead in any and all capacities, to execute and deliver in his or her name
and on his or her behalf:

          (a) one or more Registration Statements (with all exhibits thereto) of
     the Corporation on Form S-4 or any other appropriate form proposed to be
     filed by the Corporation with the Securities and Exchange Commission (the
     "SEC") (including, without limitation, Registration Statements filed
     pursuant to Rule 462(b) ("Rule 462(b)") under the Securities Act of 1933,
     as amended, or any successor thereto (the "Securities Act")) for the
     purpose of registering under the Securities Act, 5,000,000 shares of Common
     Stock, par value $0.01 per share (including the associated rights to
     purchase and the issuance of Series A Junior Participating Preferred Stock
     of the Corporation, the "Common Stock") of the Corporation plus any
     additional shares of Common Stock that may be registered pursuant to Rule
     462(b);

          (b) any and all supplements and amendments (including, without
     limitation, post-effective amendments) to such Registration Statements; and

          (c) any and all other certificates, letters, reports, statements,
     applications and any other documents and instruments in connection with the
     registration of the Securities which such attorneys-in-fact and agents, or
     any one of them, deem necessary, advisable or appropriate to enable the
     Corpora  tion to comply with (i) the Securities Act, the Securities
     Exchange Act of 1934, as amended, and the other federal securities laws of
     the United States of America and the rules, regulations and  requirements
     of the SEC in respect of any thereof; (ii) the securities or Blue Sky laws
     of any state or other govern  mental subdivision of the United States of
     America; and (iii) the securities or similar applicable laws of any foreign
     jurisdiction;
<PAGE>
 
and each of the undersigned hereby grants unto such attorneys-in-fact and
agents, and each of them, or his or her substitute or substitutes, the power and
authority to do each and every act and thing requisite and necessary to be done
in and about the premises as fully as to all intents and purposes as he or she
might or could do in person, and does hereby ratify and confirm as his or her
own acts and deeds all that such attorneys-in-fact and agents, and each of them,
or his or her substitute or substitutes, shall lawfully do or cause to be done
by virtue hereof.  Each one of such attorneys-in-fact and agents shall have, and
may exercise, all of the powers hereby conferred.

          IN WITNESS WHEREOF, the undersigned has hereunto subscribed this power
of attorney this 11th day of June 1998.



/s/  Mark A. Pulido
- -------------------                    -----------------
Mark A. Pulido                         David S. Pottruck         
                                                                 
                                                                 
/s/ Richard H. Hawkins                                           
- ----------------------                 -----------------
Richard H. Hawkins                     Carl E. Reichardt          
                                                                  
                                                                  
/s/ Heidi E. Yodowitz                  /s/ Alan Seelenfreund      
- ---------------------                  ---------------------      
Heidi E. Yodowitz                      Alan Seelenfreund          
                                                                  
                                                                  
/s/ Mary G.F. Bitterman                /s/ Jane E. Shaw           
- -----------------------                ----------------           
Mary G. F. Bitterman                   Jane E. Shaw               
                                                                  
                                                                  
/s/ Tully M. Friedman                  /s/ Robert H. Waterman, Jr.
- ---------------------                  ---------------------------
Tully M. Friedman                      Robert H. Waterman, Jr.     


/s/ John M. Pietruski
- ---------------------
John M. Pietruski

                                       2


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