Company to Provide Third-Quarter Results and Financial Guidance for 2008 and 2010

Merck & Co., Inc. will hold its third-quarter 2008 sales and earnings conference call with institutional investors and analysts beginning at 9 a.m. EDT on Wednesday, Oct. 22. During the call, Richard T. Clark, chairman, president and chief executive officer, Peter N. Kellogg, executive vice president and chief financial officer, and Kenneth C. Frazier, executive vice president and president, Global Human Health, will provide an overview of Merck’s financial performance for the quarter plus 2008 and 2010 financial guidance.

Journalists are invited to listen only by calling (706) 758-9928 or (800) 399-7917. A replay of the call will be available starting at 12 p.m. EDT on Oct. 22 through 5 p.m. EDT on Oct. 29. At the conclusion of the call, journalists who wish to ask questions are invited to call Media Relations. To listen to the replay, dial (706) 645-9291 or (800) 642-1687 and enter ID No. 65968968.

Investors, journalists and the general public may access a live audio webcast of the call on Merck’s Web site at http://www.merck.com/newsroom/webcast. Software needed to listen to the webcast is available on the corporate Web site and should be downloaded prior to the beginning of the webcast. A replay of the webcast will be available from 12 p.m. EDT on Oct. 22 through 5 p.m. EDT on Oct. 29. The third-quarter sales and earnings press release and supplemental financial disclosures also will be available in the Newsroom.

About Merck

Merck & Co., Inc. is a global research-driven pharmaceutical company dedicated to putting patients first. Established in 1891, Merck discovers, develops, manufactures and markets vaccines and medicines to address unmet medical needs. The Company devotes extensive efforts to increase access to medicines through far-reaching programs that not only donate Merck medicines but help deliver them to the people who need them. Merck also publishes unbiased health information as a not-for-profit service. For more information, visit www.merck.com.

Merck & Co., Inc.
Media:
David Caouette, 908-423-3461
Amy Rose, 908-423-6537
or
Investors:
Eva Boratto, 908-423-5185
Michael Nally, 908-423-4465