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Antimicrobial Exposure and Risk for Incident Major Depressive Disorder.
Hope Thelander1, Brett Heintz1, Lucas Watson1
1From the Iowa City Veterans Affairs Health Care System.
Journal of Clinical Psychopharmacology
|April 4, 2025
Summary
Antibacterial use is linked to a small but significant rise in depression risk, particularly within 8 weeks of exposure. This association varied by antibacterial spectrum, highlighting potential gut-brain axis impacts.
Area of Science:
- Medical Research
- Microbiology
- Psychiatry
Background:
- Antibacterials are widely prescribed, but can disrupt gut flora.
- Gut flora imbalances are increasingly linked to mental health via the gut-brain axis.
- Previous studies suggest a potential link between antimicrobial use and depression.
Purpose of the Study:
- To investigate the association between antimicrobial exposure and the risk of developing depression.
- To determine if different classes of antimicrobials have varying associations with depression risk.
Main Methods:
- Utilized National Veterans Health Administration data for 878,405 patients prescribed antimicrobials in 2018.
- Employed sequence symmetry analysis to compare depression incidence before and after antibacterial exposure.
- Used antifungals, antivirals, and nonsystemic antibacterials as negative controls.
Main Results:
- Antibacterial initiation showed a significant increase in depression risk (SR=1.04).
- This association was primarily observed within the first 8 weeks post-exposure.
- Broader-spectrum antibacterials demonstrated a stronger association with depression risk compared to narrow-spectrum ones. No significant association was found for control antimicrobial groups.
Conclusions:
- Antibacterial exposure is associated with an increased risk of depressive disorders.
- Findings support emerging research on the gut-brain axis and mental health.
- Further investigation into a causal relationship between antibacterials and adverse mental health outcomes is warranted.
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