Source	Comment
Concise Guide to Drug Interaction Principles for Medical Practice: Cytochrome P450s, UGTs, P-glycoproteins14	Comprehensive guide to drug interactions with useful charts and representative cases
Indiana University School of Medicine drug interaction table (http://medicine.iupui.edu/flockhart/table.htm)16	Continually updated table of important substrates, inhibitors, and inducers with direct links from each drug name to a PubMed list of citations
Drugs section in the Lexi-Complete PDA software package from Lexi-Comp	This PDA software includes a section on cytochrome P450 enzyme activity for each drug narrative