Elvitegravir

Elvitegravir (EVG) is an integrase inhibitor used to treat HIV infection. It was developed[1] by the pharmaceutical company Gilead Sciences, which licensed EVG from Japan Tobacco in March 2008.[2][3][4] The drug gained approval by the U.S. Food and Drug Administration on August 27, 2012 for use in adult patients starting HIV treatment for the first time as part of the fixed dose combination known as Stribild.[5] On September 24, 2014 the FDA approved Elvitegravir as a single pill formulation under the trade name Vitekta.[6] On November 5, 2015 the FDA approved the drug for use in patients affected with HIV-1 as a part of a second fixed dose combination pill known as Genvoya.[7]

Elvitegravir
Clinical data
Trade namesVitekta; Stribild (fixed-dose combination)
Other namesGS-9137
License data
Pregnancy
category
  • US: B (No risk in non-human studies)
    Routes of
    administration    		oral
    ATC code
    Pharmacokinetic data
    Protein binding98%
    Metabolismliver, via CYP3A
    Elimination half-life12.9 (8.7–13.7) hours
    Excretionliver 93%, renal 7%
    Identifiers
    CAS Number
    PubChem CID
    DrugBank
    ChemSpider
    UNII
    KEGG
    ChEBI
    ChEMBL
    NIAID ChemDB
    Chemical and physical data
    FormulaC23H23ClFNO5
    Molar mass447.883 g/mol g·mol−1
    3D model (JSmol)
     NY (what is this?)  (verify)

    According to the results of the phase II clinical trial, patients taking once-daily elvitegravir boosted by ritonavir had greater reductions in viral load after 24 weeks compared to individuals randomized to receive a ritonavir-boosted protease inhibitor.[8]

    Medical uses

    In the United States, elvitegravir can be obtained either as part of the combination pills Stribild or Genvoya, or as the single pill formulation Vitekta.[9]

    Vitekta is FDA approved to be used for the treatment of HIV-1 infection in adults who have previous treatment experience with antiretroviral therapy. It must be used in combination with a protease inhibitor that is coadministered with ritonavir as well as additional antiretroviral drug(s).[10]

    Adverse effects

    The most common side effects of taking elvitegravir are diarrhea (in 7% of patients) and nausea (4%). Other side effects that occurred in more than 1% of people are headache, tiredness, rashes, and vomiting.[10][11]

    Interactions and contraindications

    Elvitegravir is metabolised via the liver enzyme CYP3A. Substances that induce this enzyme can reduce elvitegravir concentrations in the body, potentially triggering the development of resistant virus strains. Consequently, co-administration of strong CYP3A inducers is contraindicated; examples are rifampicin, the anticonvulsants carbamazepine, phenobarbital and phenytoin, as well as St John's wort.[11]

    Glucuronidation of elvitegravir is facilitated by the enzymes UGT1A1 and 3, resulting in increased blood plasma levels when taken together with strong UGT1A inhibitors such as ritonavir and other HIV protease inhibitors.[11][12] (But ritonavir also increases elvitegravir levels by inhibiting CYP3A.)

    Furthermore, elvitegravir is a weak to medium inducer of CYP1A2, CYP2C19, CYP2C9, CYP3A, and a number of UGTs; the clinical relevance of these findings is however unclear.[11]

    Pharmacology

    Mechanism of action

    Elvitegravir inhibits the enzyme integrase of HIV-1, and of HIV-2 to a lesser extent. The virus needs this enzyme to integrate its genetic code into the host's DNA.[11]

    Pharmacokinetics

    The drug is taken by mouth. When taken together with ritonavir and a meal, it reaches highest blood plasma concentrations after four hours. Bioavailability is better with fatty meals. In the bloodstream, 98–99% of the substance are bound to plasma proteins. It is metabolized mainly by CYP3A oxidation, and secondly by UGT1A1 and 3 glucuronidation. Nearly 95% are excreted via the feces, and the rest via urine. Plasma half-life when combined with ritonavir is 8.7 to 13.7 hours.[11]

    References
    1. Gilead Press Release Phase III Clinical Trial of Elvitegravir July 22, 2008
    2. Gilead Press Release Gilead and Japan Tobacco Sign Licensing Agreement for Novel HIV Integrase Inhibitor March 22, 2008
    3. Shimura K, Kodama E, Sakagami Y, et al. (2007). "Broad Anti-Retroviral Activity and Resistance Profile of a Novel Human Immunodeficiency Virus Integrase Inhibitor, Elvitegravir (JTK-303/GS-9137)". J Virol. 82 (2): 764–74. doi:10.1128/JVI.01534-07. PMC 2224569. PMID 17977962.
    4. Stellbrink HJ (2007). "Antiviral drugs in the treatment of AIDS: what is in the pipeline ?". Eur. J. Med. Res. 12 (9): 483–95. PMID 17933730.
    5. Sax, P. E.; Dejesus, E.; Mills, A.; Zolopa, A.; Cohen, C.; Wohl, D.; Gallant, J. E.; Liu, H. C.; Zhong, L.; Yale, K.; White, K.; Kearney, B. P.; Szwarcberg, J.; Quirk, E.; Cheng, A. K.; Gs-Us-236-0102 Study, T. (2012). "Co-formulated elvitegravir, cobicistat, emtricitabine, and tenofovir versus co-formulated efavirenz, emtricitabine, and tenofovir for initial treatment of HIV-1 infection: A randomised, double-blind, phase 3 trial, analysis of results after 48 weeks". The Lancet. 379 (9835): 2439–2448. doi:10.1016/S0140-6736(12)60917-9. PMID 22748591.
    6. "FDA Approval Bulletin" Archived 2014-11-03 at the Wayback Machine Accessed November 1, 2014
    7. "Press Announcements - FDA approves new treatment for HIV". www.fda.gov. Retrieved 2016-01-10.
    8. Thaczuk, Derek and Carter, Michael. ICAAC: Best response to elvitegravir seen when used with T-20 and other active agents Archived 2010-01-02 at the Wayback Machine Aidsmap.com. 19 Sept. 2007.
    9. "FDA Approved Drug Listing" Accessed March 3, 2017
    10. "Vitekta Package Insert" Foster City, CA: Gilead Sciences, Inc.; 2014. Accessed November 1, 2014
    11. Haberfeld, H, ed. (2015). Austria-Codex (in German). Vienna: Österreichischer Apothekerverlag.
    12. Zhang, D; Chando, T. J.; Everett, D. W.; Patten, C. J.; Dehal, S. S.; Humphreys, W. G. (2005). "In vitro inhibition of UDP glucuronosyltransferases by atazanavir and other HIV protease inhibitors and the relationship of this property to in vivo bilirubin glucuronidation". Drug Metabolism and Disposition. 33 (11): 1729–39. doi:10.1124/dmd.105.005447. PMID 16118329.
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