THE CORPORATE LIBRARY

Related Party Transactions and Outside Related Director Information

Merck & Co., Inc. (MRK)

3/09/2006 Proxy Information

Mr. William B. Harrison, Jr. is a director of the Company and in 2005 was the Chairman and Chief Executive Officer of J.P. Morgan Chase & Co., which provided financial advisory, commercial and investment banking services to the Company during 2005.

Ms. Anne M. Tatlock is a director of the Company and in 2005 was the investment manager for certain customer accounts at Fiduciary Trust Company International. Those accounts may, at times, hold shares of Merck Common Stock. However, Ms. Tatlock has divested all voting and/or investment power over any shares of Merck Common Stock held in those accounts and she disclaims beneficial ownership of any such shares.

Dr. Johnnetta B. Cole is a director of the Company and in 2005 was the Chair of the Board of Trustees of United Way of America. The Company, its affiliates and employees contribute to various United Way organizations.

Ms. Rochelle B. Lazarus is a director of the Company and in 2005 was the Chairman and Chief Executive Officer of Ogilvy & Mather Worldwide. The Company has retained Ogilvy & Mather to provide advertising services in the past, including in 2005.

3/10/2005 Proxy Information

Mr. William B. Harrison, Jr. is a director of the Company and in 2004 was the Chairman and Chief Executive Officer of J.P. Morgan Chase & Co., which provided financial advisory, commercial and investment banking services to the Company during 2004.

Ms. Anne M. Tatlock is a director of the Company and in 2004 was the investment manager for certain customer accounts at Fiduciary Trust Company International. Those accounts may, at times, hold shares of Merck Common Stock. However, Ms. Tatlock has divested all voting and/or investment power over any shares of Merck Common Stock held in those accounts and she disclaims beneficial ownership of any such shares.

Dr. Johnnetta B. Cole is a director of the Company and in 2004 was the Chair of the Board of Trustees of United Way of America. The Company, its affiliates and employees contribute to various United Way organizations.

Ms. Rochelle B. Lazarus is a director of the Company and in 2004 was the Chairman and Chief Executive Officer of Ogilvy & Mather Worldwide. The Company has retained Ogilvy & Mather to provide advertising services in the past, including in 2004.

Mr. Edward M. Scolnick was Executive Vice President of Science and Technology of Merck Research from 1997 until December 2002 and became Executive Vice President of Science & Technology for Merck & Company, Inc. in 1993. In 1984, he became Senior Vice President of Research and Senior Vice President of Cell Biology Research. Mr. Scolnick was named President of Merck Research in 1985 as well as Senior Vice President of Merck & Co., Inc. In 1982, he joined Merck & Company, Inc. as Executive Director of Basic Research for their Research Laboratories, and became Vice President of Virus and Cell Biology Research in 1983.

3/10/2004 Proxy Information

Mr. William B. Harrison, Jr. is a director of the Company and in 2003 was the Chairman and Chief Executive Officer of J.P. Morgan Chase & Co., which provided financial advisory, commercial and investment banking services to the Company during 2003, including with respect to the Company’s spin-off of Medco Health Solutions, Inc. and the acquisition of shares of Banyu Pharmaceutical Co., Ltd.

Ms. Anne M. Tatlock is a director of the Company and in 2003 was the investment manager for certain customer accounts at Fiduciary Trust Company International. Those accounts may, at times, hold shares of Merck Common Stock. However, Ms. Tatlock has divested all voting and/or investment power over any shares of Merck Common Stock held in those accounts and she disclaims beneficial ownership of any such shares.

Dr. Johnnetta B. Cole is the Chair of the Board of Trustees of United Way of America. The Company, its affiliates and employees contribute to various United Way organizations.

Dr. Peter S. Kim, President, MRL, who joined the Company and became an executive officer in February 2001, received an interest-free loan from the Company in connection with his relocation. During 2003, the largest aggregate amount outstanding under the loan was $375,000 and as of January 31, 2004, $266,667 was still outstanding. This loan was made to Dr. Kim prior to the effective date of the prohibition of loans to executive officers under the Sarbanes-Oxley Act of 2002, and is grandfathered under that Act.