RT Journal Article SR Electronic T1 Challenges and choices in drug therapy for chronic pain JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 119 OP 138 VO 70 IS 2 A1 Fishman, Scott M. A1 Teichera, David YR 2003 UL http://www.ccjm.org/content/70/2/119.abstract AB By treating chronic pain effectively, physicians can improve the quality of their patients’ lives considerably. This article reviews the mechanisms and treatment of chronic pain, with emphasis on overcoming the barriers to effective analgesia.