Merck Launches Medical Wireless Website

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WHITEHOUSE STATION, N.J., February 16, 2005 — Merck & Co., Inc. today introduced a new wireless browsing format for MerckMedicus.com, an award-winning online medical resource for physicians and other healthcare professionals. This new access avenue allows physicians to use a wireless personal digital assistant (PDA), BlackBerry® or smartphone to remotely access in real-time some of the most widely used and trusted health information resources from MerckMedicus.com.

Registered users of MerckMedicus.com can use their wireless handheld device to connect to www.merckmedicus.com in their browser, and then sign in to access resources such as The Merck Manual of Diagnosis and Therapy, 17th Edition; Pocket Guide to Diagnostic Tests; MEDLINE journal abstracts; and Reuters Medical News. The unique Personal Search Assistant feature also allows physicians to search through the current issues of more than 200 journals in addition to the selected wireless offerings available. The MEDLINE journals and Reuters Medical News can be uniquely tailored to physician-preferred choices, specialty or therapeutic area of interest. Merck is planning to add more unique features optimized for wireless in the near future.

A 2004 Manhattan Research survey reported that 43 percent of all physicians say that the Internet is essential to their practice and 40 percent of all physicians currently use PDAs or handheld technology. The survey also reported that an additional 20 percent of physicians intend to use a PDA for practice management in the near future.

To access MerckMedicus using a wireless device, a physician must be a registered user of MerckMedicus.com, an advertising-free, health information web portal specifically designed for physicians and other healthcare providers. Registration on MerckMedicus.com is simple and free of charge. Upon registration, the user has complete access to the comprehensive array of medical resources online at MerckMedicus.com and wireless access to the selected content.

The wireless option is compatible with all cellular phones with web-browsing capabilities, smartphones and other handheld devices that use Windows® Mobile-based Pocket PC, Blackberry® or Palm OS® operating systems.

Merck first launched MerckMedicus.com in 2001, and followed with the 2004 introduction of Mobile MerckMedicus, software developed in partnership with Unbound Medicine, Inc. to provide busy physicians with the option to use MerckMedicus resources to wired (non-wireless) PDAs. According to William Detmer, M.D., president of Unbound Medicine, Inc., ³Medicine and healthcare have benefited greatly from technology in many ways, from better diagnostic tests to electronic billing and clinical trial management. Today, technologies like MerckMedicus for wireless, show how technology can aid physicians in their daily practices by providing access to a wealth of information at the point of care.² For more information on new wireless offering or Mobile MerckMedicus, please visit www.merckmedicus.com .

About MerckMedicus

MerckMedicus.com is a no-cost, comprehensive online medical information portal specifically designed for physicians and other healthcare providers that provides unbiased, credible resources that offer a wide variety of scientific learning resources and cutting-edge diagnostic tools, including textbooks, journal abstracts and clinical tools such as DXplain® and TheraDoc?.

MerckMedicus was recently awarded ³Best Overall² and ³Outstanding Content² for Healthcare Professionals Portals by Medicine on the Net in the 2005 annual Medicine on the Net Web Excellence Awards.

The site contains no advertisements or product endorsements and has a strict privacy policy, which is detailed on the site.

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 in over 20 therapeutic categories. The company also 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 .

About Unbound Medicine, Inc.

Unbound Medicine, Inc. develops next-generation knowledge management systems for healthcare. The company’s handheld, wireless and web-based technology platform and information architecture services help partners provide healthcare professionals with advanced systems for acquiring, managing and sharing knowledge. Additional information is available at www.unboundmedicine.com .

Windows® Mobile-based Pocket PC is a registered trademark of Microsoft Corporation.

BlackBerry® is a registered trademark of Research In Motion Limited.

Palm OS® is a registered trademark of PalmSource.

DXplain® is a registered trademark of Massachusetts General Hospital.

TheraDocTM is a trademark of TheraDoc Inc.

Contacts: Cynthia Wrobel Amy Gerber (267) 305-2987 (215) 928-2348 cynthia_wrobel2@merck.com XXX@merck.com> agerber@dorland.com