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EVALUATION OF THE EFFECTS OF FAVIPIRAVIR (T-705) ON THE LUNG TISSUE OF HEALTY RATS: AN EXPERIMENTAL STUDY.

Food Chem Toxicol

January 2025

Department of Histology and Embryology, Erciyes University, Faculty of Medicine, 38039 Kayseri, Turkey. Electronic address:

Favipiravir, a broad-spectrum RNA-dependent RNA polymerase inhibitor widely used during the COVID-19 pandemic, effectively reduces viral load but has been linked to inflammatory changes in tissues such as the liver and kidneys. High-dose and prolonged use of favipiravir for COVID-19 raises concerns about its potential toxic effects on the lungs, particularly in patients with pre-existing pulmonary conditions. This study investigated favipiravir's effects on lung tissue in healthy rats.

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In response to the urgent need for effective treatments during the rapid spread and high mortality rate of COVID-19, existing drugs were repurposed for potential antiviral effects, including favipiravir, originally designed as an RNA-dependent RNA polymerase inhibitor for influenza. Despite limited antiviral effectiveness against COVID-19, favipiravir has been reported to cause several adverse drug events (ADEs) in the body. Recent studies have shown that favipiravir can damage various tissues in rats.

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A diverse group of RNA viruses have the ability to gain access to the central nervous system (CNS) and cause severe neurological disease. Current treatment for people with this type of infection is generally limited to supportive care. To address the need for reliable antivirals, we utilized a strategy of lethal mutagenesis to limit virus replication.

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Context: Recently, a few antiviral drugs viz Molnupiravir (EIDD-1931), Favipiravir, Ribavirin, Sofosbuvir, Galidesivir, and Remdesivir are shown to be beneficial against COVID-19 disease. These drugs bind to the viral RNA single strand to inhibit the virus genome replication. Similarly, recently, some artificial nucleotides, such as P, J, B, X, Z, V, S, and K were proposed to behave as potent antiviral candidates.

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Severe fever with thrombocytopenia syndrome virus (SFTSV), also known as the Dabie Banda virus, is an emerging tick-borne Bunyavirus that causes severe fever with thrombocytopenia syndrome (SFTS). Currently, symptomatic treatment and antiviral therapy with ribavirin and favipiravir are used in clinical management. However, their therapeutical efficacy is hardly satisfactory in patients with high viral load.

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