EXHIBIT 24



                               POWER OF ATTORNEY


     KNOW ALL MEN BY THESE PRESENTS THAT the undersigned directors and officers
of McKesson HBOC, Inc., a Delaware corporation (the "Company") do hereby
constitute and appoint Ivan D. Meyerson and Kristina Veaco his or her true and
lawful attorney and agent, each with full power and authority (acting alone and
without the other) to execute in the name and on behalf of the undersigned as
such Director and/or Officer, a Registration Statement on Form S-8 under the
Securities Act of 1933, as amended, with respect to the registration of shares
of the Company's Common Stock, par value $.01 per share, that may be issued by
the Company under the McKesson HBOC, Inc. 1999 Stock Option and Restricted Stock
Plan, and to execute any and all amendments to such Registration Statement,
whether filed prior or subsequent to the time such Registration Statement
becomes effective.  The undersigned hereby grants unto such attorneys and
agents, and each of them, full power of substitution and revocation in the
premises and hereby ratifies and confirms all that such attorneys and agents may
do or cause to be done by virtue of these presents.



/s/Alfred C. Eckert III                  /s/James V. Napier
Director                                 Director

/s/Tully M. Friedman                     /s/David S. Pottruck
Director                                 Director

/s/John H. Hammergren,                   /s/Carl E. Reichardt
Co-President and                         Director
Co-Chief Executive Officer and Director
(co-Principal Executive Officer)

/s/Alton F. Irby III                     /s/Alan Seelenfreund
Director                                 Chairman of the Board and Director


/s/M. Christine Jacobs                   /s/Jane E. Shaw
Director                                 Director

/s/David L. Mahoney                      /s/Heidi E. Yodowitz,
Co-Presdient and                         Vice President, Controller and
Co-Chief Executive Officer and Director  Acting Chief Financial Officer
(Co-Principal Executive Officer)

/s/Gerald E. Mayo
Director

Dated: January 31, 2000