Fig. 1. Structure of Favipiravir. N N CONH2 F OH in vitro Key words I Table 1. Effects of favipiravir-RTP on DNA or RNA polymerases Polymerase Species Type IC50 ( mol/L) RNA polymerase Influenza virus RdRp 0.341 DNA polymerase Human DdDp 1,000 DNA polymerase Human DdDp 1,000 DNA polymerase Human DdDp 1,000 RNA polymerase II Human DdRp 905 RdRp: RNA-dependent RNA polymerase, DdDp: DNA-dependent DNA