The Metabolism and Transport Drug Interaction Database© (DIDB) is a web-based research tool ( http://www.druginteractioninfo.org ) for scientists and clinicians working in the field of drug interactions (DIs). The DIDB enables users to access, manage, and analyze the scientific basis of clinical drug interactions for drugs, biologics, food, and herbal derivatives. Users can search the database using a number of queries that allow them to approach the data from different perspectives. This chapter illustrates how the DIDB can be used by clinical investigators to manage drug interactions of new molecular entities in the context of a disease and its comorbidities or during multicenter trials.