EXHIBIT 23.3
 
                                                       BEAR, STEARNS & CO. INC.
 
                                                                245 PARK AVENUE
                                                       NEW YORK, NEW YORK 10167
                                                                 (212) 272-2000
 
                                                                ATLANTA--BOSTON
                                                   CHICAGO--DALLAS--LOS ANGELES
                                                        NEW YORK--SAN FRANCISCO
                                                              GENEVA--HONG KONG
                                                           LONDON--PARIS--TOKYO
   
November 25, 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 Amendment No. 1 to 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