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Arbidol ball-and-stick.png
Systematic (IUPAC) name
Clinical data
  • N/A
  • N/A
Pharmacokinetic data
Bioavailability N/A
Metabolism N/A
Half-life 17–21 hours
Excretion renal[citation needed]
131707-23-8 N
PubChem CID 9958103
DrugBank N/A N
ChemSpider 116151 N
Chemical data
Formula C22H28BrClN2O4S
531.89 g/mol
 N (what is this?)  (verify)

Umifenovir[1] (trade name Russian: Арбидол, Chinese: 阿比朵尔) is an antiviral treatment for influenza infection used in Russia[2] and China. The drug is manufactured by Pharmstandard (Russian: Фармстандарт) and since 2005 it has been the number one best-selling over-the-counter drug in Russia.[3] Although some Russian studies have shown it to be effective, it is not approved for use in Western countries. Chemically, arbidol features an indole core, functionalized at all but one positions with different substituents. The drug inhibits viral entry into target cells and also stimulates the immune response.

Arbidol is manufactured and made available as both tablets and capsules.


Testing of arbidol's efficacy has mainly occurred in China and Russia,[4][5] and it is well known in these two countries.[6]

Some of the Russian tests showed the drug to be effective.[4]

Mode of action[edit]


Arbidol inhibits membrane fusion.[2] Arbidol prevents contact between the virus and target host cells. Fusion between the viral capsid and the cell membrane of the target cell is inhibited. This prevents viral entry to the target cell, and therefore protects it from infection.[7]

Some evidence suggests that the drug's actions are more effective at preventing infections from RNA viruses than infections from DNA viruses.[8]

As well as specific antiviral action against both influenza A and influenza B viruses, arbidol exhibits modulatory effects on the immune system. The drug stimulates a humoral immune response, induces interferon-production, and stimulates the phagocytic function of macrophages.[9]

Clinical application[edit]

Arbidol is used primarily as an antiviral treatments for influenza. The drug has also been investigated as a candidate drug for treatment of hepatitis C.[10]

Side effects[edit]

Side effects in children include sensitization to the drug. No known overdose cases have been reported and allergic reactions are limited to people with hypersensitivity. The LD50 is more than 4 g/kg.[11]


  1. ^ Recommended INN: List 65., WHO Drug Information, Vol. 25, No. 1, 2011, page 91
  2. ^ a b Leneva IA, Russell RJ, Boriskin YS, Hay AJ (February 2009). "Characteristics of arbidol-resistant mutants of influenza virus: implications for the mechanism of anti-influenza action of arbidol". Antiviral Res. 81 (2): 132–40. doi:10.1016/j.antiviral.2008.10.009. PMID 19028526. 
  3. ^ Продажи арбидола упали на треть (in Russian)
  4. ^ a b Leneva IA, Fediakina IT, Gus'kova TA, Glushkov RG (2005). "[Sensitivity of various influenza virus strains to arbidol. Influence of arbidol combination with different antiviral drugs on reproduction of influenza virus A]". Терапевтический Архив (Therapeutic Archive) (Russian translation) (Moscow, Russia: ИЗДАТЕЛЬСТВО "МЕДИЦИНА") 77 (8): 84–88. PMID 16206613. Retrieved 2008-02-22. 
  5. ^ Wang MZ, Cai BQ, Li LY et al. (2004). "[Efficacy and safety of arbidol in treatment of naturally acquired influenza]". Zhongguo Yi Xue Ke Xue Yuan Xaue Bao (in Chinese) 26 (3): 289–93. PMID 15266832. 
  6. ^ Boriskin YS, Leneva IA, Pécheur EI, Polyak SJ (2008). "Arbidol: a broad-spectrum antiviral compound that blocks viral fusion". Curr. Med. Chem. 15 (10): 997–1005. doi:10.2174/092986708784049658. PMID 18393857. 
  7. ^ Boriskin YS, Pécheur EI, Polyak SJ (2006). "Arbidol: a broad-spectrum antiviral that inhibits acute and chronic HCV infection". Virol. J. 3: 56. doi:10.1186/1743-422X-3-56. PMC 1559594. PMID 16854226. 
  8. ^ Shi L, Xiong H, He J et al. (2007). "Antiviral activity of arbidol against influenza A virus, respiratory syncytial virus, rhinovirus, coxsackie virus and adenovirus in vitro and in vivo". Arch. Virol. 152 (8): 1447–55. doi:10.1007/s00705-007-0974-5. PMID 17497238. 
  9. ^ Glushkov RG, Gus'kova TA, Krylova LIu, Nikolaeva IS (1999). "[Mechanisms of arbidole's immunomodulating action]". Vestn. Akad. Med. Nauk SSSR (in Russian) (3): 36–40. PMID 10222830. 
  10. ^ Pécheur EI, Lavillette D, Alcaras F et al. (2007). "Biochemical mechanism of hepatitis C virus inhibition by the broad-spectrum antiviral arbidol". Biochemistry 46 (20): 6050–9. doi:10.1021/bi700181j. PMC 2532706. PMID 17455911. 
  11. ^

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