Individual Differences in Opioid Efficacy for Chronic Noncancer PainRiley, Joseph L. III PhD; Hastie, Barbara A. PhDThe Clinical Journal of Pain: July-August 2008 - Volume 24 - Issue 6 - p 509-520 doi: 10.1097/AJP.0b013e31816c6654 Special Topic Series Abstract Author Information Objective Over a decade ago, Jamison noted the lack of studies that identify patient profiles or specific groups that might be best suited for opioid treatment of chronic noncancer pain. Methods This paper reviews the studies that provide evidence for individual differences in opioid analgesia for chronic noncancer pain. Results What we have found is that few investigations have addressed these important aspects of pain treatment. The most consistent finding is that depression and anxiety are associated with increased risk for drug abuse and decreased opioid efficacy. Discussion The question remains whether the psychologic disorders antedated the pain condition or whether the experience of chronic pain exerts psychologic pressures that cause changes in behavior and psychologic processes. Additionally, the overall pattern suggests that younger age is predictive of opioid abuse and greater opioid efficacy. We also present a brief review of biologic mechanisms that support individual differences on opioid analgesia. Department of Community Dentistry and Behavioral Science, College of Dentistry, University of Florida, FL Reprints: Joseph L. Riley III, PhD, Department of Community Dentistry and Behavioral Science, University of Florida, PO Box 103628, Gainesville, FL 32610-3628 (e-mail: firstname.lastname@example.org). Received for publication January 27, 2008; Accepted January 28, 2008 © 2008 Lippincott Williams & Wilkins, Inc.