Description: Favipiravir Na is the sodium salt of Favipiravir (formerly T-705; T705; T 705; Avigan), which is an approved antiviral drug used to treat influenza in Japan. It is a selective RNA-dependent RNA polymerase inhibitor. It has been used to treat influenza virus infections in Japan and is also being investigated for treating other viral infections such as SARS-CoV-2.