LANCASTER, Calif.--(BUSINESS WIRE)--Simulations Plus, Inc. (NASDAQ:SLP), a leading provider of software for pharmaceutical discovery and development, today announced that it has received a purchase order from the U.S. Food and Drug Administration to renew one of the licenses for the Company’s GastroPlus™ simulation software and to add the newly introduced ADMET Predictor™ Module for GastroPlus.