Bipolar medication studies report mixed gut-microbe changes, with uncertain clinical meaning
A review of adults receiving medication for bipolar disorder found varied gut-microbe changes and differences between treatment responders and nonresponders. These observations do not establish that microbial changes explain symptom improvement.
Based on the published abstract. The full paper may contain additional methods, results and limitations.
The 30-second takeaway
The review links psychiatric medication use with mixed changes in gut microbes among adults with bipolar disorder. People whose depressive symptoms improved with quetiapine had microbial profiles more similar to healthy comparison participants than nonresponders did. These patterns do not show that the microbes caused improvement or establish microbiome testing as a treatment-selection tool.
Studies differed in methods and outcomes. Some had substantial bias or inadequate control of other influences, included other psychiatric diagnoses, or potentially reused participant populations. These limitations weaken interpretation of the reported patterns.
Mixed microbial observations
The review describes increases in bacteria it labels beneficial and in bacteria linked to metabolic dysfunction. It also reports bacteria associated with resistance to multiple antibiotics. These microbial observations are not measured rates of infection or metabolic disease.
Responder profiles are associations
Quetiapine responders had gut microbial communities and brain-connectivity patterns more closely resembling those of healthy participants. This comparison describes a pattern accompanying symptom response; it does not determine whether microbial differences drove, followed or otherwise related to that response.
The original publication
Pharmaco-psychiatry and gut microbiome: a systematic review of effects of psychotropic drugs for bipolar disorder.
Bui TA, O'Croinin BR, Dennett L et al.
Microbiology (Reading) · 2025
- PubMed ID
- 40528728
- Record checked
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