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An Overview of Psychotropic Drug-Drug Interactions

Dr. Sandson is the Director of the Division of Education and Residency Training for the Sheppard Pratt Health System, Towson, Md., Associate Director of the University of Maryland/Sheppard Pratt Psychiatry Residency Program, Baltimore, and Clinical Assistant Professor in the Department of Psychiatry at the University of Maryland Medical System, Baltimore. Dr. Armstrong is the Medical Director, Center for Geriatric Psychiatry, Tuality Forest Grove Hospital, Forest Grove, Ore., and Associate Clinical Professor of Psychiatry, Oregon Health Sciences University, Portland, Ore. Dr. Cozza is a staff psychiatrist for the Infectious Disease Service, Department of Medicine, Walter Reed Army Medical Center, Washington, D.C., and Assistant Professor of Psychiatry, Uniformed Services University of Health Sciences, Bethesda, Md. Dr. Sandson is the author of Drug Interactions Case Book: The Cytochrome P450 System and Beyond (American Psychiatric Publishing Inc., 2003). Drs. Armstrong and Cozza are co-authors, along with Dr. Jessica R. Oesterheld, of the Concise Guide to Drug Interaction Principles for Medical Practice: Cytochrome P450s, UGTs, P-Glycoproteins, 2nd edition (American Psychiatric Publishing, Inc., 2003). Address correspondence to Dr. Armstrong, Tuality Forest Grove Hospital, 1809 Maple St., Forest Grove, OR 97116; scott.armstrong{at}tuality.org (e-mail).
The opinions or assertions contained herein are the private views of the authors and are not to be construed as official or as reflecting the views of the Department of the Army or the Department of Defense.

The psychotropic drug-drug interactions most likely to be relevant to psychiatrists’ practices are examined. The metabolism and the enzymatic and P-glycoprotein inhibition/induction profiles of all antidepressants, antipsychotics, and mood stabilizers are described; all clinically meaningful drug-drug interactions between agents in these psychotropic classes, as well as with frequently encountered nonpsychotropic agents, are detailed; and information on the pharmacokinetic/pharmacodynamic results, mechanisms, and clinical consequences of these interactions is presented. Although the range of drug-drug interactions involving psychotropic agents is large, it is a finite and manageable subset of the much larger domain of all possible drug-drug interactions. Sophisticated computer programs will ultimately provide the best means of avoiding drug-drug interactions. Until these programs are developed, the best defense against drug-drug interactions is awareness and focused attention to this issue.

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