Favipiravir is effective against several strains of influenza viruses, including those that are resistant to existing anti-influenza drugs. Favipiravir also showed an antiviral activity in experimental animals against other RNA viruses, including arenaviruses, alphaviruses, bunyaviruses, and flaviviruses [71]. Furthermore, preliminary results also indicated that favipiravir potentially possesses a moderate activity against Ebola [72]. Importantly, a recent nonrandomized, open-label study in patients (n = 80) with non-severe COVID-19 showed that favipiravir (1600 mg orally twice daily on the first day, then 600 mg orally twice daily for thirteen days) with INF-α had significantly better therapeutic effects on SARS-CoV-2 infection, in terms of disease progression and viral clearance, than lopinavir/ritonavir with INF-α [73]. Furthermore, an open-label, prospective, randomized, multicenter study in adults (n = 236) with COVID-19 pneumonia in China revealed that favipiravir (1600 mg orally twice daily on the first day, then 600 mg orally twice daily for 7–10 days) was associated with a higher 7-day clinical recovery rate compared to a control group treated with umifenovir, a potential inhibitor of the membrane fusion stage during the virus infection, (200 mg three times daily for 7–10 days). The 7-day clinical recovery rate in patients with moderate COVID-19 pneumonia was 71% in the favipiravir-treated patients, whereas the rate was 56% in the umifenovir-treated patients. Likewise, the 7-day clinical recovery rate in patients with severe to critical COVID-19 pneumonia was 6% versus 0%, respectively [74]. Currently, favipiravir is being studied alone or in combination with tocilizumab, hydroxychloroquine, or oseltamivir for the treatment of COVID-19 in more than 23 clinical trials across the world.