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Are we cherry picking participants for studies of antidepressants?
Date:4/28/2009

PITTSBURGH, April 28 Findings from clinical studies used to gain Food and Drug Administration approval of common antidepressants are not applicable to most patients with depression, according to a report led by the University of Pittsburgh Graduate School of Public Health. Published in the May issue of the American Journal of Psychiatry, the study suggests only a small percentage of people with depression qualify for these studies, and those who do not qualify are often treated with the same medications but may suffer poorer clinical outcomes.

A part of the National Institute of Mental Health-funded Sequenced Treatment Alternatives to Relieve Depression (STAR*D) project the largest study of the treatment of depression conducted in the United States researchers compared symptoms and outcomes in depressed patients who met phase III study inclusion criteria to those who did not. Phase III studies for antidepressants determine the effectiveness of the drug in comparison to a placebo. The inclusion criteria for these studies are not standardized nor subject to federal guidelines, resulting in some variation from study to study in the profile of eligible patients. Typically excluded are patients with milder forms of depression, who might be more likely to respond to a placebo drug, and those who may have chronic depression or psychiatric and medical co-morbidities additional illnesses or conditions.

After assessing 2,855 patients treated with citalopram, a commonly prescribed selective serotonin reuptake inhibitor for mood disorders, study authors concluded that fewer than one in four, or 22.2 percent, of the patients met the usual criteria for inclusion in phase III antidepressant trials.

"Only a small percentage of depressed patients in our study would have qualified for inclusion in phase III efficacy trials of depression drugs," said study lead author, Stephen Wisniewski, Ph.D., professor of epidemiology and co-directo
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Contact: Clare Collins
CollCX@upmc.edu
412-647-3555
University of Pittsburgh Schools of the Health Sciences
Source:Eurekalert

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