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Education, not medical advice. Do not start, stop, or change any medication or supplement without your own clinician, who knows your history and other medicines.

Treatment · Repurposed drug

Fluvoxamine / SSRI

An antidepressant with anti-inflammatory properties, tested as a way to prevent long COVID. In a randomized trial it did not work for prevention, an honest negative, though whether SSRIs help established long COVID is a separate open question.

Short version: fluvoxamine during acute COVID did not prevent long COVID in a randomized trial. Whether an SSRI helps established long COVID, given the serotonin findings, is untested rather than disproven.

An antidepressant repurposed

Fluvoxamine is an SSRI with anti-inflammatory (sigma-1) properties that drew interest for COVID. Given the serotonin findings in long COVID, SSRIs are a natural thing to test.1

An immune system that will not switch off Persistent viral antigenAutoantibodiesExhausted, misfiring T cells Immune systemkept activated chronic inflammation, tissue effects
In long COVID the immune system often behaves as though the threat never ended. Lingering viral antigen, antibodies that attack the body's own receptors, and T cells stuck in an exhausted, miscoordinated state all keep it switched on. The result is low-grade, chronic inflammation that can injure tissue far from where the virus first landed.

What the trial showed

In the same COVID-OUT randomized trial where metformin worked, fluvoxamine taken during acute infection did not reduce later long COVID. That is an honest negative for prevention, and it sets a high bar.1

negative for prevention

What is still open

The trial tested prevention during acute infection, not treatment of established long COVID, and not based on the serotonin mechanism. Whether an SSRI helps established long COVID, especially the cognitive symptoms, remains untested rather than ruled out.

What taking it is actually like

Taken daily, started low and increased, with the full effect taking weeks. Early on it can bring nausea, sleep changes, and sometimes jitteriness or heightened anxiety before it helps; sexual side effects can persist. It interacts with several medicines and strongly slows how the body clears caffeine, so intake is adjusted. It should not be stopped abruptly, and the first weeks are watched for mood changes or agitation, especially in younger people. This is a clinician-guided trial, not a self-start.

What we don't know

Honest about the edges of the evidence. These are open questions, not settled answers.

  • Whether an SSRI helps established long COVID symptoms.
  • Whether the serotonin findings translate to a treatment.
  • Which patients, if any, benefit.

References

Every reference is free to read in full.

  1. COVID-OUT trial: metformin, ivermectin, and fluvoxamine for preventing long COVID (Lancet ID 2023).

Associated topics

SymptomFatigue / PEM coretreatsSymptomChronic fatiguetreats
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