Favipiravir

Favipiravir
Clinical data
Trade namesAvigan (アビガン, Abigan), Avifavir, Areplivir, others
Other namesT-705, favipira, favilavir
Routes of
administration		By mouth
ATC code
Legal status
Legal status
  • In general: ℞ (Prescription only)
Identifiers
  • 6-fluoro-3-hydroxypyrazine-2-carboxamide
CAS Number
PubChem CID
DrugBank
ChemSpider
UNII
KEGG
ChEBI
ChEMBL
CompTox Dashboard (EPA)
Chemical and physical data
FormulaC5H4FN3O2
Molar mass157.104 g·mol−1
3D model (JSmol)
  • C1=C(N=C(C(=O)N1)C(=O)N)F
  • InChI=1S/C5H4FN3O2/c6-2-1-8-5(11)3(9-2)4(7)10/h1H,(H2,7,10)(H,8,11)
  • Key:ZCGNOVWYSGBHAU-UHFFFAOYSA-N

Favipiravir, sold under the brand name Avigan among others, is an antiviral medication used to treat influenza in Japan. It is also being studied to treat a number of other viral infections, including SARS-CoV-2. Like the experimental antiviral drugs T-1105 and T-1106, it is a pyrazinecarboxamide derivative.

It is being developed and manufactured by Toyama Chemical (a subsidiary of Fujifilm) and was approved for medical use in Japan in 2014. In 2016, Fujifilm licensed it to Zhejiang Hisun Pharmaceutical Co. It became a generic drug in 2019.

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