Cumulative Antidepressant Use and Risk of Dementia in a Prospective Cohort Study.
Publication Title
Journal of the American Geriatrics Society
Document Type
Article
Publication Date
10-1-2018
Keywords
antidepressants; dementia; depression
Abstract
OBJECTIVES: To determine whether antidepressant use is associated with dementia risk.
DESIGN: Prospective cohort study.
SETTING: Kaiser Permanente Washington (KPWA), an integrated healthcare delivery system.
PARTICIPANTS: Community-dwelling individuals aged 65 and older without dementia and with 10 years or more of KPWA enrollment at baseline (N=3,059).
MEASUREMENTS: Primary exposures were selective serotonin reuptake inhibitors (paroxetine vs other), tricyclic antidepressants, and serotonin antagonist and reuptake inhibitors. Using health plan pharmacy data, we calculated cumulative medication exposure, defined as total standardized daily doses (TSDDs), over rolling 10-year windows. Exposure in the most recent year was excluded to avoid use related to prodromal symptoms. The Cognitive Abilities Screening Instrument was administered every 2 years; low scores triggered clinical evaluation and consensus diagnosis procedures. Dementia risk was estimated according to medication use using Cox proportional hazards models.
RESULTS: During a mean follow-up of 7.7 years, 775 participants (25%) developed dementia; 659 (22%) developed possible or probable Alzheimer's disease. Individual antidepressant classes were not associated with differences in dementia risk, although paroxetine use was associated with higher risk of dementia for all TSDD categories than no use (0-90 TSDDs: hazard ratio (HR)=1.69, 95% confidence interval (CI)=1.18-2.42; 91-365 TSDDs: HR=1.40, 95% CI=0.88-2.23; 366-1095 TSDDs: HR=2.13, 95% CI=1.32-3.43; ≥1095 TSDDs: HR=1.42, 95% CI=0.82-2.46).
CONCLUSION: Most commonly prescribed nonanticholinergic depression medications used in late life do not appear to be associated with dementia risk. Paroxetine and other anticholinergic antidepressants may be exceptions in older individuals. Future studies are warranted to improve scientific understanding of potential associations in other settings and populations.
Area of Special Interest
Mental Health
Specialty/Research Institute
Geriatrics
Specialty/Research Institute
Behavioral Health
Specialty/Research Institute
Pharmacy
