EXHIBIT 24.1

                               POWER OF ATTORNEY

          KNOW ALL MEN BY THESE PRESENTS THAT the undersigned directors and
officers of McKesson Corporation, a Delaware corporation (the "Company"), do
hereby constitute and appoint Ivan D. Meyerson and Nancy A. Miller his or her
true and lawful attorneys-in-fact and agents, each with full power and authority
(acting alone or without the other) to execute in the name and on behalf of the
undersigned as such Director and/or Officer, a Registration Statement under the
Securities Act of 1933, as amended, with respect to the registration of shares
of the Company's Common Stock, that may be issued in connection with the
proposed merger of wholly-owned subsidiary of the Company into Hawk Medical
Supply, Inc. and to execute any and all amendments to such Registration
Statement, and to file the same with all exhibits thereto and other documents in
connection therewith, 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 hereof.


          Signature                                 Capacity 
          ---------                                 -------- 

   /s/ Mark A. Pulido            President, Chief Executive Officer and Director
- -------------------------------  
       Mark A. Pulido                                                         
                                                                              
   /s/ Richard H. Hawkins        Vice President and Chief Financial Officer
- ------------------------------- 
       Richard H. Hawkins                                                      
                                                                               
   /s/ Heidi E. Yodowitz         Controller
- ------------------------------- 
       Heidi E. Yodowitz                                                       
                                                                               
   /s/ Alan Seelenfreund         Director, Chairman of the Board              
- -------------------------------           
       Alan Seelenfreund                                                       
                                                                               
   /s/ Mary G.F. Bitterman       Director                                     
- -------------------------------                
       Mary G.F. Bitterman                                                    
                                
                                 Director 
- ------------------------------- 
       Tully M. Friedman                                                       
                                                                               
   /s/ John M. Pietruski         Director    
- -------------------------------    
       John M. Pietruski        
                                
                                 Director  
- -------------------------------                       
       David S. Pottruck                                   
                                
                                 Director  
- -------------------------------                  
       Carl E. Reichardt        
                                
   /s/ Jane E. Shaw              Director
- -------------------------------           
       Jane E. Shaw             
                                                     
   /s/ Robert H. Waterman, Jr.   Director
- -------------------------------            
       Robert H. Waterman, Jr.
 
 
 
Dated:  May 29, 1998