A common antidepressant may help millions of people living with long COVID, according to a major international clinical trial that found the medication significantly reduced persistent fatigue, one of the condition's most debilitating symptoms. The findings, published in the Annals of Internal Medicine suggest that fluvoxamine, an selective serotonin reuptake inhibitor (SSRI), could become one of the first evidence-backed treatments specifically targeting long COVID-related fatigue. Fatigue Due To Long COVIDEven after completely recovering from COVID-19 infection, millions continue to experience long COVID, a condition that causes symptoms that last for months or even years. Fatigue is among the most common complaints, often accompanied by brain fog, poor concentration, sleep disturbances and reduced quality of life. Despite the growing burden, there are currently no widely accepted drug treatments for long COVID fatigue, making the new findings particularly significant.Also read: COVID-19 In India: Omicron RF.5 Primarily Affects Throat, Unlikely To Trigger Pneumonia In Healthy People, Say ExpertsWhat Did The Study Find?Researchers conducted a randomized, placebo-controlled clinical trial with 399 adults in Brazil who had experienced long COVID symptoms for at least 90 days after their initial infection. Participants were randomly assigned to receive either: FluvoxamineMetforminPlaceboAfter treatment and follow-up, patients taking fluvoxamine reported significantly lower fatigue scores compared with those receiving placebo. Improvements were observed within the first month and became more pronounced after 60 days. Participants also reported having a better quality of life. On the other hand, Metformin did not show a meaningful benefit for long COVID fatigue in this trial. Serious adverse events were rare, and fluvoxamine was generally well tolerated.Also read: India Logs 339 COVID-19 Cases In First Half Of July: What To Know About The RF.5 Omicron SubvariantAbout FluvoxamineFluvoxamine is commonly used to treat depression and obsessive-compulsive disorder (OCD). Scientists believe its benefits in long COVID may extend beyond its antidepressant effects. The drug is thought to reduce inflammation and influence immune signaling through activation of the sigma-1 receptor, a protein involved in regulating inflammatory responses and cellular stress. These mechanisms have also made fluvoxamine a subject of previous COVID-19 treatment research. Researchers caution, however, that the exact biological mechanism behind its effect on long COVID fatigue remains under investigation. Lead investigator Dr. Gilmar Reis of Pontifical Catholic University of Minas Gerais said the findings represent an important step toward treating one of long COVID's most persistent symptoms. "This trial gives clinicians their first strong evidence for a medication that helps reduce long COVID fatigue." Senior author Dr. Edward Mills, professor at McMaster University, said, "This is an important step forward for patients who have been desperate for evidence-based options." While researchers describe the results as encouraging, they stress that fluvoxamine should not be started without medical supervision. Long COVID Affects Millions Long COVID is estimated to affect tens of millions of people worldwide, with persistent fatigue preventing patients from carrying out everyday activities. Because fluvoxamine is already widely available, inexpensive and familiar to physicians, experts say positive findings from this trial could help future research and influence treatment strategies if it fairs well in larger studies. Researchers describe the study as one of the strongest pieces of evidence that a medication can effectively reduce long COVID fatigue, offering hope for patients who have been struggling.