title: Reasons for antidepressant nonadherence among veterans treated in primary care clinics.
abstract: OBJECTIVE
  To examine the experiences of veterans (mostly middle-aged and elderly men) prescribed antidepressants, specifically with regard to different types of nonadherence, reasons for nonadherence, and side effects.
  
  
  METHODS
  A mixed-methods analysis of Department of Veterans Affairs primary care patients (N = 395) with depression (9-item depression scale of the Patient Health Questionnaire criteria) enrolled in a randomized collaborative care trial was conducted. Adherence was measured from patient self-report and pharmacy data. Qualitative interviews elicited in-depth information regarding adherence. The study was conducted from April 2003 to September 2005.
  
  
  RESULTS
  The intervention significantly improved self-reported adherence at 6 months (OR = 2.1; 95% CI, 1.0-4.4; P = .04) and 12 months (OR = 2.7; 95% CI, 1.4-5.4; P < .01), as well as medication possession at 12 months (OR = 1.82; 95% CI, 1.0-3.2; P = .04). The most common type of nonadherence at 6 months was discontinuation (12.2%), followed by not taking as prescribed (10.9%) and never took (4.8%). For patients discontinuing their antidepressant in the first 6 months, the most common and important reason was that it was not helping. Only 19.4% of patients with self-reported adherence ≥ 80% responded to treatment by 6 months. Side effects were also a commonly reported reason for discontinuation at 6 months, with 82% reporting experiencing side effects. One-third (31.4%) reported difficulty with sexual activity at 6 months, with 66.1% reporting that it was severe. Qualitative interviews supported the finding that side effects, and generally not feeling like oneself, are important adherence barriers.
  
  
  CONCLUSIONS
  In this sample of mostly middle-aged and elderly men with depression, treatment nonresponse and side effects were the rule rather than the exception. These findings suggest that nonadherence may have resulted primarily from patients' negative experiences with antidepressants rather than structural barriers or noncompliant behaviors.
  
  
  BACKGROUND
  Clinicaltrials.gov Identifier: NCT00105690.
authors.affiliation: VA HSR&D Center for Mental Health Outcomes and Research (152/NLR), Little Rock VA Medical Center, 2200 Fort Roots Dr, North Little Rock, AR 72114, USA. fortneyjohnc@uams.edu
authors.forename: John C
authors.initials: JC
authors.lastname: Fortney
authors.forename: Jeffrey M
authors.initials: JM
authors.lastname: Pyne
authors.forename: Mark J
authors.initials: MJ
authors.lastname: Edlund
authors.forename: Tracy
authors.initials: T
authors.lastname: Stecker
authors.forename: Dinesh
authors.initials: D
authors.lastname: Mittal
authors.forename: Dean E
authors.initials: DE
authors.lastname: Robinson
authors.forename: Kathy L
authors.initials: KL
authors.lastname: Henderson
mesh_terms: D000928:Antidepressive Agents / Q000009:adverse effects / Q000627:therapeutic use*; D003866:Depressive Disorder / Q000188:drug therapy* / Q000523:psychology; D005260:Female; D006801:Humans; D008297:Male; D055118:Medication Adherence / Q000523:psychology; D008875:Middle Aged; D011569:Psychiatric Status Rating Scales; D012044:Regression Analysis; D012307:Risk Factors; D013997:Time Factors; D014481:United States; D014728:Veterans / Q000523:psychology*
chemical_list: D000928:Antidepressive Agents