EXHIBIT 23.3
 
                   [LETTERHEAD OF BEAR, STEARNS & CO. INC.]
 
November 9, 1998
 
Board of Directors
McKesson Corporation
McKesson Plaza
One Post Street
San Francisco, California 94104
 
Ladies and Gentlemen:
 
  We hereby consent to the inclusion in the Registration Statement on Form S-4
(the "Registration Statement") of McKesson Corporation, a Delaware corporation
("McKesson"), of our opinion letter appearing as Annex D to the Joint Proxy
Statement/Prospectus which is a part of the Registration Statement and to the
references to our firm name in the Registration Statement. In giving such
consent, we do not thereby admit that we come within the category of persons
whose consent is required under Section 7 of the Securities Act of 1933, as
amended (the "Securities Act"), or the rules and regulations of the Securities
and Exchange Commission (the "SEC") promulgated thereunder, nor do we admit
that we are experts with respect to any part of the Registration Statement
within the meaning of the term "experts" as used in the Securities Act, or the
rules and regulations of the SEC promulgated thereunder.
 
Very truly yours,
 
Bear, Stearns & Co. Inc.
 
By: /s/ Kevin P. Clarke
  -------------------------
  Name: Kevin P. Clarke
  Title: Senior Managing Director