EXHIBIT 21

                         SUBSIDIARIES OF THE REGISTRANT

  There is no parent of the Company. The following is a listing of the
significant subsidiaries of the Company, or if indented, subsidiaries of the
Company under which they are listed:



                                                                 Jurisdiction of
                                                                  Organization
                                                                 ---------------
                                                              
   HBO & Company................................................    Delaware
   McKesson Canada Inc..........................................    Canada
     Medis Health and Pharmaceutical Services Inc...............    Canada
   GM Holdings, Inc.............................................    Delaware
     McKesson General Medical Corp..............................    Virginia