WALTHAM, Mass.--(BUSINESS WIRE)--April 20, 2006--PRAECIS PHARMACEUTICALS INCORPORATED (NASDAQ: PRCS - News) today announced that O. Prem Das, Ph.D. has joined the Company as Senior Vice President, Technology Partnerships. Dr. Das will be responsible for the establishment and management of strategic partnerships relating to DirectSelect(TM), the Company’s innovative drug discovery technology. DirectSelect(TM) is based on DNA-tagged small molecule libraries that are ultra-large, enable rapid screening without robotics and can potentially access targets difficult to handle using other drug discovery methods. Dr. Das will report to Kevin F. McLaughlin, President and Chief Executive Officer, and will serve as a member of PRAECIS’ senior management team.