EXHIBIT 3.4 AMENDMENTS TO RESTATED BY-LAWS OF McKESSON HBOC, INC. (As adopted by the Board of Directors on April 26, 1999) The second and fourth sentences, respectively, of Section 9. Stockholder Proposals at Annual Meeting., in Article II of the Restated By-Laws of McKesson HBOC, Inc. were amended to read as follows: "To be properly brought before an annual meeting, business must be specified in the notice of meeting (or any supplement thereto) given by or at the direction of the Board of Directors, otherwise properly brought before the meeting by or at the direction of the Board of Directors or otherwise properly brought before the meeting by a stockholder of the Corporation (i) who is a stockholder of record on the date of the giving of the notice provided for in this Section 9 and on the record date for the determination of stockholders entitled to vote at such annual meeting and (ii) who complies with the notice procedures set forth in this Section 9." "To be timely, a stockholder's notice to the Secretary must be delivered to or mailed and received at the principal executive offices of the Corporation, not less than 90 days nor more than 120 days prior to the anniversary date of the immediately preceding annual meeting of stockholders; provided, however, that in the event that the annual meeting is called for a date that is not within 30 days before or after such anniversary date, notice by the stockholder in order to be timely must be so received not later than the close of business on the 10th day following the day on which such notice of the date of the annual meeting was mailed or such public disclosure of the date of the annual meeting was made, whichever first occurs." The second and fourth sentences, respectively, of Section 10. Nominations of Persons for Election to the Board of Directors., in Article II of the Restated By-Laws of McKesson HBOC, Inc. were amended to read as follows: "Nominations of persons for election to the Board of Directors of the Corporation may be made at a meeting of stockholders by or at the direction of the Board of Directors, by any nominating committee or person appointed by the Board of Directors or by any stockholder of the Corporation (i) who is a stockholder of record on the date of the giving of the notice provided for in this Section 10 and on the record date for the determination of stockholders entitled to vote at such annual meeting and (ii) who complies with the notice procedures set forth in this Section 10." "To be timely, a stockholder's notice to the Secretary must be delivered to or mailed and received at the principal executive offices of the Corporation not less than 90 days nor more than 120 days prior to the anniversary date of the immediately preceding annual meeting of stockholders; provided, however, that in the event that the annual meeting is called for a date that is not within 30 days before or after such anniversary date, notice by the stockholder in order to be timely must be so received not later than the close of business on the 10th day following the day on which such notice of the date of the annual meeting was mailed or such public disclosure of the date of the annual meeting was made, whichever first occurs."