Exhibit (99) Contacts: McKesson Media Larry Kurtz Vice President, Corporate Communications 415-983-8418 or Investors Janet Bley Vice President, Investor Relations 415-983-9357 McKESSON ANNOUNCES $300 MILLION PRIVATE PLACEMENT OF SENIOR UNSECURED DEBT SAN FRANCISCO, CALIF., February 24, 1998 -- McKesson Corporation (NYSE:MCK) announced today that it has completed a private placement of $300 million senior unsecured debt securities. The placement consists of $150 million senior unsecured debt securities due March 1, 2005, with a coupon of 6.30% and issue price of 99.992, and $150 million senior unsecured debt securities due March 1, 2008, with a coupon of 6.40% and issue price of 99.764. The proceeds will be used for general corporate purposes. The debt securities have not been registered under the Securities Act of 1933 and may not be offered or sold in the United States absent registration or an applicable exemption from registration requirements. ###