The intracellular concentration of ATP is 1-9 mM in various tissues (Beis & Newsholme, 1975 The approved favipiravir dose for influenza in Japan is 1,600 mg twice a day on day 1 followed by 600 mg twice a day for 4 days, and the dose for Ebloa virus infection is 6,000 mg on the first day and 2,400 mg/day on days 1-9.