Ribavirin

Ribavirin, also known as tribavirin, is an antiviral medication used to treat RSV infection, hepatitis C and some viral hemorrhagic fevers.[1] For hepatitis C, it is used in combination with other medications such as simeprevir, sofosbuvir, peginterferon alfa-2b or peginterferon alfa-2a.[1] Among the viral hemorrhagic fevers it is used for Lassa fever, Crimean–Congo hemorrhagic fever, and Hantavirus infection but should not be used for Ebola or Marburg infections.[1] Ribavirin is taken by mouth or inhaled.[1]

"Tribavirin" redirects here. It is not to be confused with taribavirin.
Ribavirin
Clinical data
Pronunciation/ˌraɪbəˈvaɪrɪn/ RY-bə-VY-rin
Trade namesCopegus, Rebetol, Virazole, other[1]
Other names1-(β-D-Ribofuranosyl)-1H-1,2,4-triazole-3-carboxamide, tribavirin (BAN UK)
AHFS/Drugs.comMonograph
MedlinePlusa605018
License data
Pregnancy
category
  • AU: X (High risk)
  • US: X (Contraindicated) [1]
    Routes of
    administration    		By mouth, solution for inhalation
    ATC code
    Legal status
    Legal status
    Pharmacokinetic data
    Bioavailability64%[2]
    Protein binding0%[2]
    Metabolismliver and intracellularly[2]
    Elimination half-life298 hours (multiple dose); 43.6 hours (single dose)[2]
    ExcretionUrine (61%), faeces (12%)[2]
    Identifiers
    CAS Number
    PubChem CID
    IUPHAR/BPS
    DrugBank
    ChemSpider
    UNII
    KEGG
    ChEMBL
    NIAID ChemDB
    PDB ligand
    CompTox Dashboard (EPA)
    ECHA InfoCard100.164.587
    Chemical and physical data
    FormulaC8H12N4O5
    Molar mass244.207 g·mol−1
    3D model (JSmol)
    Melting point166 to 168 °C (331 to 334 °F)
      (verify)

    Common side effects include feeling tired, headache, nausea, fever, muscle pains, and an irritable mood.[1] Serious side effects include red blood cell breakdown, liver problems, and allergic reactions.[1] Use during pregnancy results in harm to the baby.[1] Effective birth control is recommended for both males and females for at least 7 months during and after use.[3] The mechanism of action of ribavirin is not entirely clear.[1]

    Ribavirin was patented in 1971 and approved for medical use in 1986.[4] It is on the World Health Organization's List of Essential Medicines, the safest and most effective medicines needed in a health system.[5] It is available as a generic medication.[1]

    Medical uses

    Ribavirin is used primarily to treat hepatitis C and viral hemorrhagic fevers (which is an orphan indication in most countries).[6] In this former indication the oral (capsule or tablet) form of ribavirin is used in combination with pegylated interferon alfa.[7][8][9][10] Including in people coinfected with hepatitis B, HIV and in the pediatric population.[9][11][12] Statins may improve this combination's efficacy in treating hepatitis C.[13] Ribavirin is the only known treatment for a variety of viral hemorrhagic fevers, including Lassa fever, Crimean-Congo hemorrhagic fever, Venezuelan hemorrhagic fever, and Hantavirus infection, although data regarding these infections are scarce and the drug might be effective only in early stages.[14][15][16][17] It is noted by the USAMRIID that "Ribavirin has poor in vitro and in vivo activity against the filoviruses (Ebola[18] and Marburg) and the flaviviruses (dengue, yellow fever, Omsk hemorrhagic fever, and Kyasanur forest disease)"[19] The aerosol form has been used in the past to treat respiratory syncytial virus-related diseases in children, although the evidence to support this is rather weak.[20]

    It has been used (in combination with ketamine, midazolam, and amantadine) in treatment of rabies.[21]

    Experimental data indicate that ribavirin may have useful activity against canine distemper and poxviruses.[22][23] Ribavirin has also been used as a treatment for herpes simplex virus. One small study found that ribavirin treatment reduced the severity of herpes outbreaks and promoted recovery, as compared with placebo treatment.[24] Another study found that ribavirin potentiated the antiviral effect of acyclovir.[25]

    Some interest has been seen in its possible use as a treatment for cancers, especially acute myeloid leukemia.[26][27]

    Adverse effects
    For a more comprehensive list, see List of adverse effects of ribavirin.

    The medication has two FDA "black box" warnings: One raises concerns that use before or during pregnancy by either sex may result in birth defects in the baby, and the other is regarding the risk of red blood cell breakdown.[28]

    Ribavirin should not be given with zidovudine because of the increased risk of anemia;[29] concurrent use with didanosine should likewise be avoided because of an increased risk of mitochondrial toxicity.[30]

    Mechanisms of action

    It is a guanosine (ribonucleic) analog used to stop viral RNA synthesis and viral mRNA capping, thus, it is a nucleoside inhibitor. Ribavirin is a prodrug, which when metabolized resembles purine RNA nucleotides. In this form, it interferes with RNA metabolism required for viral replication. Over five direct and indirect mechanisms have been proposed for its mechanism of action.[31]

    RNA viruses

    Ribavirin's carboxamide group can make the native nucleoside drug resemble adenosine or guanosine, depending on its rotation. For this reason, when ribavirin is incorporated into RNA, as a base analog of either adenine or guanine, it pairs equally well with either uracil or cytosine, inducing mutations in RNA-dependent replication in RNA viruses. Such hypermutation can be lethal to RNA viruses.[32][33]

    DNA viruses

    Neither of these mechanisms explains ribavirin's effect on many DNA viruses, which is more of a mystery, especially given the complete inactivity of ribavirin's 2' deoxyribose analogue, which suggests that the drug functions only as an RNA nucleoside mimic, and never a DNA nucleoside mimic. Ribavirin 5'-monophosphate inhibits cellular inosine monophosphate dehydrogenase, thereby depleting intracellular pools of GTP.[34] [ERROR: the cited paper refers only to an RNA virus and so does not support this section's assertion. A reference to a DNA virus is needed here.]

    History

    Ribavirin was first made in 1972.[35] This was done by researchers from International Chemical and Nuclear Corporation including Joseph T. Witkovski and Roland K. Robins.[36]

    It was reported that ribavirin was active against a variety of RNA and DNA viruses in culture and in animals, without undue toxicity.[37]

    Names

    Ribavirin is the INN and USAN, whereas tribavirin is the BAN. Brand names of generic forms include Copegus, Ribasphere, Rebetol.[1]

    Derivatives

    Ribavirin is possibly best viewed as a ribosyl purine analogue with an incomplete purine 6-membered ring. This structural resemblance historically prompted replacement of the 2' nitrogen of the triazole with a carbon (which becomes the 5' carbon in an imidazole), in an attempt to partly "fill out" the second ring--- but to no great effect. Such 5' imidazole riboside derivatives show antiviral activity with 5' hydrogen or halide, but the larger the substituent, the smaller the activity, and all proved less active than ribavirin.[38] Note that two natural products were already known with this imidazole riboside structure: substitution at the 5' carbon with OH results in pyrazofurin, an antibiotic with antiviral properties but unacceptable toxicity, and replacement with an amino group results in the natural purine synthetic precursor 5-aminoimidazole-4-carboxamide-1-β-D-ribofuranoside (AICAR), which has only modest antiviral properties.

    Taribavirin
    Main article: Taribavirin

    The most successful ribavirin derivative to date is the 3-carboxamidine derivative of the parent 3-carboxamide, first reported in 1973 by J. T. Witkowski et al.,[39] and now called taribavirin (former names viramidine and ribamidine). This drug shows a similar spectrum of antiviral activity to ribavirin, which is not surprising as it is now known to be a pro-drug for ribavirin. Taribavirin, however, has useful properties of less erythrocyte-trapping and better liver-targeting than ribavirin. The first property is due to taribavirin's basic amidine group which inhibits drug entry into RBCs, and the second property is probably due to increased concentration of the enzymes which convert amidine to amide in liver tissue.[40] Taribavirin was in phase III human trials.

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    gollark: What *sort* of challenge?
    gollark: Have each person provide a few sentences or paragraphs.
    gollark: Why not cut out the middleman and directly crowdsource the book?

    See also

    References
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    2. "PRODUCT INFORMATION REBETOL® (RIBAVIRIN) CAPSULES" (PDF). TGA eBusiness Services. Merck Sharp & Dohme (Australia) Pty Limited. 29 April 2013. Archived from the original on 16 August 2017. Retrieved 23 February 2014.
    3. World Health Organization (2009). Stuart MC, Kouimtzi M, Hill SR (eds.). WHO Model Formulary 2008. World Health Organization. p. 177. hdl:10665/44053. ISBN 9789241547659.
    4. Fischer, Janos; Ganellin, C. Robin (2006). Analogue-based Drug Discovery. John Wiley & Sons. p. 504. ISBN 9783527607495. Archived from the original on 2016-12-20.
    5. World Health Organization (2019). World Health Organization model list of essential medicines: 21st list 2019. Geneva: World Health Organization. hdl:10665/325771. WHO/MVP/EMP/IAU/2019.06. License: CC BY-NC-SA 3.0 IGO.
    6. "Rebetol, Ribasphere (ribavirin) dosing, indications, interactions, adverse effects, and more". Medscape Reference. WebMD. Archived from the original on 28 February 2014. Retrieved 23 February 2014.
    7. Paeshuyse J, Dallmeier K, Neyts J (December 2011). "Ribavirin for the treatment of chronic hepatitis C virus infection: a review of the proposed mechanisms of action". Current Opinion in Virology. 1 (6): 590–8. doi:10.1016/j.coviro.2011.10.030. PMID 22440916.
    8. Flori N, Funakoshi N, Duny Y, Valats JC, Bismuth M, Christophorou D, Daurès JP, Blanc P (March 2013). "Pegylated interferon-α2a and ribavirin versus pegylated interferon-α2b and ribavirin in chronic hepatitis C : a meta-analysis". Drugs. 73 (3): 263–77. doi:10.1007/s40265-013-0027-1. PMID 23436591.
    9. Druyts E, Thorlund K, Wu P, Kanters S, Yaya S, Cooper CL, Mills EJ (April 2013). "Efficacy and safety of pegylated interferon alfa-2a or alfa-2b plus ribavirin for the treatment of chronic hepatitis C in children and adolescents: a systematic review and meta-analysis". Clinical Infectious Diseases. 56 (7): 961–7. doi:10.1093/cid/cis1031. PMID 23243171.
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    14. Steckbriefe seltener und importierter Infektionskrankheiten [Characteristics of rare and imported infectious diseases] (PDF). Berlin: Robert Koch Institute. 2006. ISBN 978-3-89606-095-2. Archived from the original (PDF) on 2011-09-29.
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    18. Goeijenbier M, van Kampen JJ, Reusken CB, Koopmans MP, van Gorp EC (November 2014). "Ebola virus disease: a review on epidemiology, symptoms, treatment and pathogenesis". The Netherlands Journal of Medicine. 72 (9): 442–8. PMID 25387613. Archived from the original on 2014-11-29.
    19. Medical Management of Biological Casualties Handbook. United States Government Printing Office. 2011. p. 115. ISBN 978-0-16-090015-0.
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    27. Borden KL, Culjkovic-Kraljacic B (October 2010). "Ribavirin as an anti-cancer therapy: acute myeloid leukemia and beyond?". Leukemia & Lymphoma. 51 (10): 1805–15. doi:10.3109/10428194.2010.496506. PMC 2950216. PMID 20629523.
    28. "Copedgus" (PDF). FDA.gov. Archived (PDF) from the original on 3 November 2014. Retrieved 16 April 2017.
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    30. Bani-Sadr F, Carrat F, Pol S, Hor R, Rosenthal E, Goujard C, Morand P, Lunel-Fabiani F, Salmon-Ceron D, Piroth L, Pialoux G, Bentata M, Cacoub P, Perronne C (September 2005). "Risk factors for symptomatic mitochondrial toxicity in HIV/hepatitis C virus-coinfected patients during interferon plus ribavirin-based therapy". Journal of Acquired Immune Deficiency Syndromes. 40 (1): 47–52. doi:10.1097/01.qai.0000174649.51084.46. PMID 16123681.
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    40. Sidwell RW, Bailey KW, Wong MH, Barnard DL, Smee DF (October 2005). "In vitro and in vivo influenza virus-inhibitory effects of viramidine". Antiviral Research. 68 (1): 10–7. doi:10.1016/j.antiviral.2005.06.003. PMID 16087250.
    • "Ribavirin". Drug Information Portal. U.S. National Library of Medicine.
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