Etravirine

Etravirine (ETR,[1] brand name Intelence, formerly known as TMC125) is a drug used for the treatment of HIV. Etravirine is a non-nucleoside reverse transcriptase inhibitor (NNRTI). Unlike the currently available agents in the class, resistance to other NNRTIs does not seem to confer resistance to etravirine.[2] Etravirine is marketed by Tibotec, a subsidiary of Johnson & Johnson. In January 2008, the Food and Drug Administration approved its use for patients with established resistance to other drugs, making it the 30th anti-HIV drug approved in the United States and the first to be approved in 2008.[3] It was also approved for use in Canada on April 1, 2008.[4]

Etravirine
Clinical data
Trade namesIntelence
AHFS/Drugs.comMonograph
MedlinePlusa608016
License data
Pregnancy
category
  • AU: B1
  • US: B (No risk in non-human studies)
    Routes of
    administration    		Oral
    ATC code
    Legal status
    Legal status
    Pharmacokinetic data
    Protein binding99.9%
    MetabolismHepatic (CYP3A4, CYP2C9 & CYP2C19-mediated)
    Elimination half-life41±20 hours
    ExcretionFaeces (93.7%), urine (1.2%)
    Identifiers
    CAS Number
    PubChem CID
    DrugBank
    ChemSpider
    UNII
    KEGG
    ChEMBL
    NIAID ChemDB
    PDB ligand
    CompTox Dashboard (EPA)
    ECHA InfoCard100.207.546
    Chemical and physical data
    FormulaC20H15BrN6O
    Molar mass435.28 g/mol g·mol−1
    3D model (JSmol)
     NY (what is this?)  (verify)

    Etravirine is licensed in the United States, Canada, Israel, Russia, Australia and the European Union,[5] and is under regulatory review in Switzerland.[6]

    Indications and dosage

    Etravirine, in combination with other anti-retrovirals, is indicated for the treatment of human immunodeficiency virus type 1 (HIV-1) infection in antiretroviral treatment-experienced adult patients, who have evidence of viral replication and HIV-1 strains resistant to a non-nucleoside reverse transcriptase inhibitor (NNRTI) and other antiretroviral agents.

    The recommended dose of etravirine is 200 mg (2 x 100 mg tablets, or 1 x 200 mg tablet as of 03/18/2011) taken twice daily following a meal. The type of food does not affect the exposure to etravirine.[7]

    Contraindication

    Each 100 mg etravirine tablet contains 160 mg of lactose. Patients with rare hereditary problems of galactose intolerance, the Lapp lactase deficiency or glucose-galactose malabsorption should not take this medicine.[8]

    Mechanism of action

    Etravirine is a second-generation non-nucleoside reverse transcriptase inhibitor (NNRTI), designed to be active against HIV with mutations that confer resistance to the two most commonly prescribed first-generation NNRTIs, mutation K103N for efavirenz and Y181C for nevirapine.[9] This potency appears to be related to etravirine's flexibility as a molecule. Etravirine is a diarylpyrimidine (DAPY), a type of organic molecule with some conformational isomerism that can bind the enzyme reverse transcriptase in multiple conformations, allowing for a more robust interaction between etravirine and the enzyme, even in the presence of mutations.[10] Other diarylpyrimidine-analogues are currently being used as anti-HIV agents, notably rilpivirine.

    Warnings and risks

    In 2009, the prescribing information for etravirine was modified to include "postmarketing reports of cases of Stevens–Johnson syndrome, toxic epidermal necrolysis and erythema multiforme, as well as hypersensitivity reactions characterized by rash, constitutional findings, and sometimes organ dysfunction, including liver failure. Intelence therapy should be immediately discontinued when signs and symptoms of severe skin or hypersensitivity reactions develop."[11]

    Repositioning

    Etravine has been studied for use in a drug repositioning application. In a paper[12] published in the medical publication Movement Disorders, Etravirine was shown to affect an increase in frataxin production. Frataxin deficiency is a key component to Friedreich's ataxia, a genetically inherited disease that causes the progressive loss of coordination and muscle strength leading to motor incapacitation and the full-time use of a wheelchair.

    References
    1. "Appendix A: Key to Acronyms". Guidelines for the Use of Antiretroviral Agents in HIV-1-Infected Adults and Adolescents. Department of Health and Human Services. Archived from the original on 2012-08-31.
    2. Stellbrink HJ (October 2007). "Antiviral drugs in the treatment of AIDS: what is in the pipeline?". Eur. J. Med. Res. 12 (9): 483–95. PMID 17933730.
    3. "FDA Approves HIV Drug Etravirine". Associated Press. January 18, 2008.
    4. "First New NNRTI in Nearly a Decade to Benefit Canadians with HIV/AIDS" (PDF) (Press release). Janssen-Ortho Inc. 2008-04-01. Archived from the original (PDF) on 2010-11-02. Retrieved 2008-07-09.
    5. "Intelence receives marketing authorisation in the European Union for HIV combination therapy". Tibotec. Archived from the original on 2011-09-28. Retrieved 2008-08-29.
    6. "Etravirine (TMC125, Intelence) granted accelerated approval in US". aidsmap. Archived from the original on 2010-01-02. Retrieved 2008-01-24.
    7. "Intelence prescribing information" (PDF). FDA. Retrieved January 19, 2012.
    8. "Etravine: Summary of product characteristics" (PDF). EMEA. p. 5. Retrieved July 13, 2011.
    9. Evans, David (2008-01-15). "Etravirine—Countdown to Launch". AIDSmeds.com. Retrieved 2008-02-02.
    10. Das K, Clark AD, Lewi PJ, Heeres J, De Jonge MR, Koymans LM, Vinkers HM, Daeyaert F, Ludovici DW, Kukla MJ, De Corte B, Kavash RW, Ho CY, Ye H, Lichtenstein MA, Andries K, Pauwels R, De Béthune MP, Boyer PL, Clark P, Hughes SH, Janssen PA, Arnold E (May 2004). "Roles of conformational and positional adaptability in structure-based design of TMC125-R165335 (etravirine) and related non-nucleoside reverse transcriptase inhibitors that are highly potent and effective against wild-type and drug-resistant HIV-1 variants". J. Med. Chem. 47 (10): 2550–60. doi:10.1021/jm030558s. PMID 15115397.
    11. "FDA Medwatch Safety Information". Retrieved 2009-08-27.
    12. Alfedi, Giulia; Luffarelli, Riccardo; Condò, Ivano; Pedini, Giorgia; Mannucci, Liliana; Massaro, Damiano S.; Benini, Monica; Toschi, Nicola; Alaimo, Giorgia; Panarello, Luca; Pacini, Laura; Fortuni, Silvia; Serio, Dario; Malisan, Florence; Testi, Roberto; Rufini, Alessandra (2019). "Drug repositioning screening identifies etravirine as a potential therapeutic for friedreich's ataxia". Movement Disorders. 34 (3): 323–334. doi:10.1002/mds.27604. PMID 30624801.


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