Merck Prices $4.25 Billion Debt Offering

Business Wire, June 22, 2009

Information for Merck Shareholders

Merck shareholders are urged to read Merck’s proxy statement relating to the proposed merger with Schering-Plough when it is available because it contains important information. Merck shareholders may obtain free copies of the proxy statement, as well as other relevant documents, without charge, at the SEC’s Internet web site (www.sec.gov). These documents may also be obtained for free from Merck’s Investor Relations Web Site (www.merck.com) or by directing a request to Merck at Merck’s Office of the Secretary, (908) 423-1000. Information regarding the interests of potential participants in Merck’s solicitation of proxies in connection with the proposed merger will be included in Merck’s proxy statement relating to the proposed merger. None of the information on Merck's website and none of Merck's public filings are incorporated by reference into this release.