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J Antimicrob Chemother. 2009 Oct;64(4):741-6. doi: 10.1093/jac/dkp274. Epub 2009 Jul 29.

Intracellular metabolism of favipiravir (T-705) in uninfected and influenza A (H5N1) virus-infected cells.

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Department of Animal, Dairy and Veterinary Sciences, Institute for Antiviral Research, Utah State University, Logan, UT, USA.



To determine the metabolism of favipiravir (T-705, 6-fluoro-3-hydroxy-2-pyrazinecarboxamide) to its ribosylated, triphosphorylated form (T-705 RTP) in uninfected and influenza A/Duck/MN/1525/81 (H5N1) virus-infected cells. Effects of treatment on intracellular guanosine triphosphate (GTP) pools and influenza virus-inhibitory activity were also assessed.


A strong anion exchange HPLC separation method with UV detection was used to quantify T-705 RTP and GTP levels in Madin-Darby canine kidney cells. Antiviral activity was determined by virus yield reduction assay.


Accumulation of T-705 RTP in uninfected cells increased linearly from 3 to 320 pmol/10(6) cells in cells exposed to 1-1000 microM extracellular T-705 for 24 h, approaching maximum levels by 9 h. Virus infection did not result in greater T-705 RTP accumulation compared with uninfected cells. Catabolism of T-705 RTP occurred after removal of T-705 from the extracellular medium, with a half-life of decay of 5.6 +/- 0.6 h. Based upon these results, short-term incubation of T-705 with H5N1 virus-infected cells was predicted to provide an antiviral benefit. Indeed, 4-8 h 10-100 microM T-705 treatment of cells resulted in virus yield reductions, but less than continuous exposure. A 100-fold higher extracellular concentration of T-705 was required to inhibit intracellular GTP levels compared with ribavirin, which helps explain ribavirin's greater toxicity.


The favourable intracellular metabolic properties of T-705 combined with its reduced cell-inhibitory properties make this compound an attractive candidate for treating human influenza virus infections.

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