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Since December 2019, a novel coronavirus (severe acute respiratory syndrome-coronavirus 2 (SARS-CoV-2)) infection has been rapidly spreading worldwide and causing the respiratory illness, coronavirus disease 2019 (COVID-19). The antiretroviral drug favipiravir (FPV) has been experimentally used for COVID-19 treatment since March 2020 in Japan. However, the pharmacokinetics of FPV in critically ill patients is unknown. We measured the serum concentration of FPV using high-performance liquid chromatography in patients with severe COVID-19