MOUNTAIN VIEW, Calif., Oct. 1 /PRNewswire-FirstCall/ -- Pharsight Corporation (OTC Bulletin Board: PHST - News), a leading provider of software, strategic consulting, and regulatory services for optimizing clinical drug development, today announced that it has added another global pharmaceutical company to its Pharsight® Knowledgebase Server(TM) (PKS(TM)) customer roster. The company, ranked in Pharmaceutical Executive’s 2007 Top 50 list as measured by prescription drug sales, has signed an agreement for PKS user licenses and associated deployment services. This new agreement brings Pharsight’s total number of PKS customers to 20.