This document discusses using virtual physiological modeling and simulation to enable personalized medicine approaches. It describes the Virtual Physiological Human initiative, which aims to enable collaborative investigation of the human body across all relevant scales through multiscale modeling. As a case study, it discusses using VPH simulation to model HIV protease drug binding at an atomic level to predict patient-specific drug efficacy and rank available drugs for treatment. Automating such simulations through high-performance computing resources could help clinicians interpret genetic information and select optimal drug therapies on an individual basis.