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Fluvoxamine Shows Promise in Lightening Long COVID Fatigue

BrazilWednesday, April 1, 2026

A recent randomized trial conducted in Brazil examined whether two widely available medications—fluvoxamine, an inexpensive antidepressant, and metformin, a common diabetes drug—could reduce the persistent tiredness that follows a COVID‑19 infection.

Study Design

  • Participants: Nearly 400 adults with fatigue lasting three months or more after COVID‑19.
  • Intervention: Random assignment to receive either fluvoxamine, metformin, or a placebo for two months.
  • Outcome Measure: Self‑reported exhaustion levels.

Key Findings

Group Result
Fluvoxamine Significant reduction in fatigue; 99 % confidence that the effect surpassed placebo.
Metformin No measurable relief; contrasts with earlier suggestions of long‑COVID risk reduction when taken during acute illness.
Placebo No improvement in fatigue levels.

Implications for Practice

  • Evidence‑based option: Fluvoxamine offers a tangible treatment avenue for patients struggling with the most crippling symptom of long COVID.
  • Safety and accessibility: The drug’s established safety profile and global availability could accelerate clinical adoption.

Unanswered Questions

  • Patient subgroups: Which patients benefit most remains unclear.
  • Mechanism of action: How fluvoxamine dampens fatigue is still unknown.
  • Optimal dosing and timing: Future studies should refine dosage, initiation timing, and underlying biological pathways.

Conclusion

This trial represents a significant step toward practical solutions for long‑COVID fatigue, providing hope that an existing medication can improve the quality of life for thousands still battling post‑viral exhaustion.

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