Pharsight Corporation Expands Leadership In PK/PD Data Management, Signs Leading Biopharmaceutical Company To PKS Deal

MOUNTAIN VIEW, Calif., Jan. 3 /PRNewswire-FirstCall/ -- Pharsight Corporation , a leading provider of software and strategic services for optimizing clinical drug development, today announced that a top-5 global biopharmaceutical company has purchased the Pharsight(R) Knowledgebase Server(TM) and will upgrade related Pharsight modeling software.

The Pharsight Knowledgebase Server (PKS(TM)) is a high-productivity, regulatory-compliant enterprise data management system. PKS enables drug developers to better manage and control preclinical and clinical kinetic and dynamic data and analyses. Companies use PKS to build pharmacokinetic/pharmacodynamic data management architecture compliant with the U.S. Food and Drug Administration’s (FDA) regulation 21 CFR Part 11, which has set new standards for computer system validation and usage. The PKS software is designed to complement Pharsight’s modeling and simulation technology for computer-based drug-disease modeling and clinical trial simulation. PKS supports analysis in leading tools such as WinNonlin(R), NONMEM(R), and SAS(R).

“As they expand their early-phase development portfolios, major biopharmaceutical companies are increasingly investing in state-of-the-art data management solutions for their kinetic and dynamic data,” said Shawn O’Connor, Pharsight’s president and chief executive officer. “Biopharmaceutical companies face the same pressures as big pharmaceutical companies to increase their development productivity with regulatory-compliant architecture. PKS is becoming the industry standard in this area. Pharsight is committed to expanding PKS market penetration by continuing to work with leading biopharmaceutical companies seeking solutions to drive compliant, productive data management.”

About Pharsight Corporation

Pharsight Corporation develops and markets integrated products and services that enable pharmaceutical and biotechnology companies to achieve significant and enduring improvements in the development and use of therapeutic products. The company’s goal is to help customers reduce the time, cost and risk of drug development, as well as optimize the post-approval marketing and use of pharmaceutical products.

Pharsight’s approach enhances the fundamental element of drug development success: strong decision-making. By adopting the Pharsight approach, customers acquire a new decision-making process with the potential to systematically improve every level and phase of their business and scientific processes. Pharsight Corporation is headquartered in Mountain View, California. Information about Pharsight is available at http://www.pharsight.com .

Forward Looking Statements

This press release includes forward-looking statements, including statements regarding the expanding market for Pharsight’s products, services and technology, trends in customer demand for Pharsight’s products, services and technology, the anticipated performance of Pharsight’s products, and the expected benefits to customers from the use of Pharsight’s products. Actual results may differ materially from Pharsight’s expectations due to a variety of factors, including: general market and business conditions; uncertainties in pharmaceutical drug development; changes in the demand for Pharsight’s products and services; changes in Pharsight’s research and development focus or operating strategies; the failure to develop new products and services or to keep pace with technological changes; delays in the release of new products and services; and the failure of products and services to obtain anticipated levels of customer acceptance or to meet customers’ expectations. Further information on potential factors that could affect actual results is included in in Pharsight’s Quarterly Report on Form 10-Q, as filed with the Securities and Exchange Commission on November 14, 2005. All forward-looking statements are based on information available to Pharsight as of the date hereof, and Pharsight assumes no obligation to update such statements, whether as a result of new developments or otherwise.

Registered Trademarks and Trademarks

Pharsight(R), WinNonlin(R), Pharsight(R) Knowledgebase Server(TM) and PKS(TM) are registered trademarks or trademarks of Pharsight Corporation. NONMEM(R) and SAS(R) are registered trademarks of their respective holders.

Pharsight Corporation

CONTACT: investors, Douglas Sherk, or Jennifer Beugelmans, both at+1-415-896-6820, or media, Steve DiMattia, +1-646-277-8706, all of EVCGroup, for Pharsight

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