RT Book, Section A1 Trevor, Anthony J. A1 Katzung, Bertram G. A1 Kruidering-Hall, Marieke M. A1 Masters, Susan B. SR Print(0) ID 56980223 T1 Chapter 4. Drug Metabolism T2 Katzung & Trevor's Pharmacology: Examination & Board Review, 10e YR 2013 FD 2013 PB The McGraw-Hill Companies PP New York, NY SN 978-0-07-178923-3 LK accesspharmacy.mhmedical.com/content.aspx?aid=56980223 RD 2024/04/24 AB All organisms are exposed to foreign chemical compounds (xenobiotics) in the air, water, and food. To ensure elimination of pharmacologically active xenobiotics as well as to terminate the action of many endogenous substances, evolution has provided metabolic pathways that alter their activity and their susceptibility to excretion.