Catalog No. size PriceQuantity
M7226-2 2mg solid $105
M7226-10 10mg solid $447



Product Information

Favipiravir, also known as Favilavir, T705, or Avigan, is a selective inhibitor of viral RNA-dependent RNA polymerase with activity against many RNA viruses, influenza viruses, West Nile virus, yellow fever virus, foot-and-mouth disease virus as well as other flaviviruses, arenaviruses, bunyaviruses and alphaviruses. Activity against enteroviruses and Rift Valley fever virus has also been demonstrated. The mechanism of its actions is thought to be related to the selective inhibition of viral RNA-dependent RNA polymerase. Favipiravir does not inhibit RNA or DNA synthesis in mammalian cells and is not toxic to them. In 2014, favipiravir was approved in Japan for stockpiling against influenza pandemics.


Chemical Formula: C5H4FN3O2


Exact Mass: 157.028

Molecular Weight: 157.1044


Elemental Analysis: C, 38.23; H, 2.57; F, 12.09; N, 26.75; O, 20.37






T 705





Chemical Name:



InChi Key:



InChi Code: InChI=1S/C5H4FN3O2/c6-2-1-8-5(11)3(9-2)4(7)10/h1H,(H2,7,10)(H,8,11)


Smiles Code:




Technical Data:


Appearance: White to off-white solid powder

Purity: >98% (or refer to the Certificate of Analysis)

Shipping Condition: Shipped under ambient temperature as non-hazardous chemical. This product is stable enough for a few weeks during ordinary shipping and time spent in Customs.

Storage Condition: Dry, dark and at 0 - 4 C for short term (days to weeks) or -20 C for long term (months to years).

Solubility: Soluble in DMSO, not in water

Shelf Life: >2 years if stored properly

Drug Formulation: This drug may be formulated in DMSO

Stock Solution Storage: 0 - 4 C for short term (days to weeks), or -20 C for long term (months).

HS Tariff Code: 2934.99.9001


In Vitro

Favipiravir (T 705) is an antiviral drug that selectively inhibits the RNA-dependent RNA polymerase of influenza virus. Favipiravir (T 705) is a novel antiviral compound that selectively and potently inhibits the RNA-dependent RNA polymerase (RdRP) of influenza and many other RNA viruses. Favipiravir-RTP does not inhibit the human DNA polymerase α, β or γ with IC50>1 mM. The IC50 for the human RNA polymerase II is 905 μM; Favipiravir is therefore 2,650 times more selective for the influenza virus RdRP, consistent with the lack of inhibition of host-cell DNA and RNA synthesis. Favipiravir (T 705) acts as a pro-drug, its cytotoxicity is expected to be cell-line dependent. Favipiravir inhibits in a dose-dependent manner MNV-induced CPE (EC50: 250±11 μM) and MNV RNA synthesis in cell culture (EC50:124±42 μM). Despite this rather modest antiviral activity, Favipiravir (T 705) is able to completely inhibit norovirus replication at a concentration of 100 μg/mL, which is a concentration that has little or no adverse effect on the host cell (cell viability >80%).


In Vivo

Favipiravir (T 705) (30 mg/kg/day, orally) improves survival compare to placebo. Favipiravir (T 705) also provides significant protection against the A/Duck/MN/1525/81(H5N1) virus at a dose of 33 mg/kg/day or more, regardless of the number of daily doses. When given 4 times a day, all mice survive.





  1. Westover JB, Sefing EJ, Bailey KW, Van Wettere AJ, Jung KH, Dagley A, Wandersee L, Downs B, Smee DF, Furuta Y, Bray M, Gowen BB. Low-dose ribavirin potentiates the antiviral activity of favipiravir against hemorrhagic fever viruses. Antiviral Res. 2016 Feb;126:62-8. doi: 10.1016/j.antiviral.2015.12.006. Epub 2015 Dec 19. PubMed PMID: 26711718; PubMed Central PMCID: PMC4724333.


  1. Yamada K, Noguchi K, Komeno T, Furuta Y, Nishizono A. Efficacy of Favipiravir (T-705) in Rabies Postexposure Prophylaxis. J Infect Dis. 2015 Dec 9. pii: jiv586. [Epub ahead of print] PubMed PMID: 26655300.


  1. Oestereich L, Rieger T, Ludtke A, Ruibal P, Wurr S, Pallasch E, Bockholt S, Krasemann S, Muñoz-Fontela C, Günther S. Efficacy of Favipiravir Alone and in Combination With Ribavirin in a Lethal, Immunocompetent Mouse Model of Lassa Fever. J Infect Dis. 2015 Nov 3. pii: jiv522. [Epub ahead of print] PubMed PMID: 26531247.


  1. Safronetz D, Rosenke K, Westover JB, Martellaro C, Okumura A, Furuta Y, Geisbert J, Saturday G, Komeno T, Geisbert TW, Feldmann H, Gowen BB. The broad-spectrum antiviral favipiravir protects guinea pigs from lethal Lassa virus infection post-disease onset. Sci Rep. 2015 Oct 12;5:14775. doi: 10.1038/srep14775. PubMed PMID: 26456301; PubMed Central PMCID: PMC4600983.


  1. Jin Z, Tucker K, Lin X, Kao CC, Shaw K, Tan H, Symons J, Behera I, Rajwanshi VK, Dyatkina N, Wang G, Beigelman L, Deval J. Biochemical Evaluation of the Inhibition Properties of Favipiravir and 2'-C-Methyl-Cytidine Triphosphates against Human and Mouse Norovirus RNA Polymerases. Antimicrob Agents Chemother. 2015 Dec;59(12):7504-16. doi: 10.1128/AAC.01391-15. Epub 2015 Sep 21. PubMed PMID: 26392512; PubMed Central PMCID: PMC4649231.


Products are for research use only. Not for human use.

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