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T-705 (Favipiravir)
Activators & Inhibitors
Chemical Modulators

T-705 (Favipiravir) #57214

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T-705 (Favipiravir): Image 1
Chemical structure of T-705 (Favipiravir).

Product Usage Information

T-705 (Favipiravir) is supplied as a lyophilized powder. For a 10 mM stock, reconstitute 2 mg of powder in 1.27 ml of DMSO. Working concentrations and length of treatment can vary depending on the desired effect.


Store lyophilized at -20ºC, desiccated. In lyophilized form, the chemical is stable for 24 months. Once in solution, store at -20ºC and use within 3 months to prevent loss of potency. Aliquot to avoid multiple freeze/thaw cycles.

Product Description

Molecular Weight 157.1 g/mol
Purity >99%
Molecular Formula C5H4FN3O2
CAS 259793-96-9
Solubility Soluble in DMSO at 30 mg/ml or water at 12 mg/ml with slight warming.


T-705 (Favipiravir) is a potent antiviral agent that has shown effectiveness against influenzas A, B, and C with IC50 values as follows: A (H1N1) = 0.03-0.20 µg/ml, A (H2N2) = 0.01-0.30 µg/ml, A (H3N2) = 0.08-0.48 µg/ml, A (H4N2) = 0.14-0.15 µg/ml, A (H7N2) = 0.24-1.60 µg/ml, B = 0.04-0.09 µg/ml, and C = 0.03-0.06 µg/ml (1,2). T-705 (Favipiravir) becomes activated by phosphoribosylation to form T-705 (Favipiravir)-RTP that is recognized by RNA polymerase, inhibiting RNA-dependent RNA polymerase (RdRP). This activity makes T-705 (Favipiravir) an effective inhibitor of other RNA viruses, such as arena-, phlebo-, hanta-, flavi-, entero-, and alphavirus. The antiviral capability of T-705 (Favipiravir) makes it a compound of interest when studying SARS-CoV-2 infection (3).
  1. Furuta, Y. et al. (2013) Antiviral Res 100, 446-54.
  2. Furuta, Y. et al. (2002) Antimicrob Agents Chemother 46, 977-81.
  3. Dong, L. et al. (2020) Drug Discov Ther 14, 58-60.

Limited Uses

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Products are labeled with For Research Use Only or a similar labeling statement and have not been approved, cleared, or licensed by the FDA or other regulatory foreign or domestic entity, for any purpose. Customer shall not use any Product for any diagnostic or therapeutic purpose, or otherwise in any manner that conflicts with its labeling statement. Products sold or licensed by CST are provided for Customer as the end-user and solely for research and development uses. Any use of Product for diagnostic, prophylactic or therapeutic purposes, or any purchase of Product for resale (alone or as a component) or other commercial purpose, requires a separate license from CST. Customer shall (a) not sell, license, loan, donate or otherwise transfer or make available any Product to any third party, whether alone or in combination with other materials, or use the Products to manufacture any commercial products, (b) not copy, modify, reverse engineer, decompile, disassemble or otherwise attempt to discover the underlying structure or technology of the Products, or use the Products for the purpose of developing any products or services that would compete with CST products or services, (c) not alter or remove from the Products any trademarks, trade names, logos, patent or copyright notices or markings, (d) use the Products solely in accordance with CST Product Terms of Sale and any applicable documentation, and (e) comply with any license, terms of service or similar agreement with respect to any third party products or services used by Customer in connection with the Products.

For Research Use Only. Not For Use In Diagnostic Procedures.
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To Purchase # 57214
Cat. # Size Qty. Price
10 mg
$ 138