Book excerpt: Drug interactions have become a significant iatrogenic complication, with as many as 5% of hospitalizations and 7,000 deaths annually attributable to drug-drug interactions in the United States. Drug interactions can be prevented with access to current, comprehensive, reliable information, and the Clinical Manual of Drug Interaction Principles for Medical Practice provides just that in a user-friendly format psychiatry clinicians (including residents and nurses) and forensics experts will find indispensable. with this new edition, the book has evolved from "Concise Guide" to "Clinical Manual