Antidepressants and Dementia Risk: Reassuring Data

TOPLINE:

Antidepressants are not associated with an increased risk for dementia, accelerated cognitive decline, or atrophy of white and gray matter in adults with no signs of cognitive impairment, new research suggests.

METHODOLOGY:

• Investigators studied 5511 individuals (58% women; mean age, 71 years) from the Rotterdam study, an ongoing prospective population-based cohort study.
• Participants were free from dementia at baseline, and incident dementia was monitored from baseline until 2018 with repeated cognitive assessments using the Mini-Mental Status Examination (MMSE) and the Geriatric Mental Schedule, as well as MRIs.
• Information on participants’ antidepressant use was extracted from pharmacy records from 1992 until baseline (2002-2008).
• During a mean follow-up of 10 years, 12% of participants developed dementia.

TAKEAWAY:

• Overall, 17% of participants had used antidepressants during the roughly 10-year period prior to baseline, and 4.1% were still using antidepressants at baseline.
• Medication use at baseline was more common in women than in men (21% vs 18%), and use increased with age: From 2.1% in participants aged between 45 and 50 years to 4.5% in those older than 80 years.
• After adjustment for confounders, there was no association between antidepressant use and dementia risk (hazard ratio [HR], 1.14; 95% CI, 0.92-1.41), accelerated cognitive decline, or atrophy of white and gray matter.
• However, tricyclic antidepressant use was associated with increased dementia risk (HR, 1.36; 95% CI, 1.01-1.83) compared with the use of selective serotonin reuptake inhibitors (HR, 1.12; 95% CI, 0.81-1.54).

IN PRACTICE:

“Although prescription of antidepressant medication in older individuals, in particular those with some cognitive impairment, may have acute symptomatic anticholinergic effects that warrant consideration in clinical practice, our results show that long-term antidepressant use does not have lasting effects on cognition or brain health in older adults without indication of cognitive impairment,” the authors wrote.

SOURCE:

Frank J. Wolters, MD, of the Department of Epidemiology and the Department of Radiology and Nuclear Medicine and Alzheimer Center, Erasmus University Medical Center, Rotterdam, the Netherlands, was the senior author on this study that was published online in Alzheimer’s and Dementia.

LIMITATIONS:

Limitations included the concern that although exclusion of participants with MMSE < 26 at baseline prevented reversed causation (ie, antidepressant use in response to depression during the prodromal phase of dementia), it may have introduced selection bias by disregarding the effects of antidepressant use prior to baseline and excluding participants with lower education.

DISCLOSURES:

This study was conducted as part of the Netherlands Consortium of Dementia Cohorts, which receives funding in the context of Deltaplan Dementie from ZonMW Memorabel and Alzheimer Nederland. Further funding was also obtained from the Stichting Erasmus Trustfonds. This study was further supported by a 2020 NARSAD Young Investigator Grant from the Brain & Behavior Research Foundation. The authors reported no conflicts of interest or relevant financial relationships.

A version of this article appeared on Medscape.com.