Serotonin Circuit Linked to Tinnitus, Affects SSRIs
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- Oregon Health & Science University researchers used optogenetic stimulation in mice to map a serotonin‑driven neural circuit that triggers tinnitus‑like behavior.
- Serotonin elevation in the mouse brain amplified tinnitus‑related responses, while silencing the identified circuit reduced the ringing behavior.
- SSRIs, which increase serotonin, may unintentionally exacerbate tinnitus, according to the mouse findings.
- Laurence Trussell, co‑senior author, advises clinicians to balance antidepressant benefits with potential tinnitus worsening when prescribing.
- PNAS published the study on May 15 2026, providing a mechanistic explanation for anecdotal reports of louder tinnitus among antidepressant users.
Why it matters: Patients with tinnitus risk louder ringing when on SSRIs, prompting clinicians to adjust antidepressant prescriptions and drug developers to address serotonin‑related auditory side effects in treatment.
