FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person *   MCKESSON CORP 2. Date of Event Requiring Statement (Month/Day/Year) 08/19/2005 3. Issuer Name and Ticker or Trading Symbol MCKESSON CORP [MCK] (Last) (First) (Middle) ONE POST STREET, MCKESSON PLAZA 4. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director __X__ 10% Owner _____ Officer (give title below) _____ Other (specify below) 5. If Amendment, Date Original Filed(Month/Day/Year) (Street) SAN FRANCISCO, CA 94104 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Beneficially Owned

1.Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5) Common Stock, par value $0.01 per share 13,861,920 I (1) Held by Spirit Acquisition Corporation, a wholly-owned subsidiary of McKesson Corporation.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.			SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
MCKESSON CORP ONE POST STREET MCKESSON PLAZA SAN FRANCISCO, CA 94104	Â	  X	Â	Â

Signatures

McKesson Corporation /s/ Ivan D. Meyerson, Executive Vice President, General Counsel and Corporate Secretary		08/24/2005
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 5(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	Spirit Acquisition Corporation ("Purchaser"), a wholly-owned subsidiary of McKesson Corporation ("McKesson") acquired 13,604,924 shares of D&K Healthcare Resources, Inc. ("D&K") common stock, par value $0.01 per share, at the expiration of, and pursuant to, the offer to purchase all of the outstanding shares of common stock of D&K as of August 22, 2005. In addition, pursuant to a Stockholder Support Agreement, dated July 8, 2005, between McKesson, Purchaser, and certain stockholders of D&K, Purchaser and McKesson acquired certain rights to control the voting and disposition of 256,996 shares of D&K restricted common stock held by the stockholders who are a party to the Stockholder Support Agreement.

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