Exhibit 99.1 FIRST AMENDMENT TO AGREEMENT AND PLAN OF MERGER This First Amendment (this "Amendment") to the Agreement and Plan of Merger, dated as of August 23, 1997 (the "Merger Agreement"), by and among Cardinal Health, Inc., an Ohio corporation...Agreement and Plan of Merger • March 17th, 1998 • Cardinal Health Inc • Wholesale-drugs, proprietaries & druggists' sundries
