Atazanavir

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Atazanavir
Clinical data
Pronunciation/ˌætəˈzænəvɪər/ AT-ə-ZAN-ə-veer[1]
Trade namesReyataz, Evotaz, others[2]
AHFS/Drugs.comMonograph
MedlinePlusa603019
License data
Pregnancy
category
Routes of
administration		By mouth
ATC code
Legal status
Legal status
Pharmacokinetic data
Bioavailability60-68%
Protein binding86%
MetabolismLiver (CYP3A4-mediated)
Elimination half-life6.5 hours
ExcretionFecal and kidney
Identifiers
  • methyl N-[(1S)-1-{[(2S,3S)-3-hydroxy-4-[(2S)-2-[(methoxycarbonyl)amino]-3,3-dimethyl-N'-{[4-(pyridin-2-yl)phenyl]methyl}butanehydrazido]-1-phenylbutan-2-yl]carbamoyl}-2,2-dimethylpropyl]carbamate
JSmol)
  • O=C(OC)N[C@H](C(=O)N[C@@H](Cc1ccccc1)[C@@H](O)CN(NC(=O)[C@@H](NC(=O)OC)C(C)(C)C)Cc3ccc(c2ncccc2)cc3)C(C)(C)C
  • InChI=1S/C38H52N6O7/c1-37(2,3)31(41-35(48)50-7)33(46)40-29(22-25-14-10-9-11-15-25)30(45)24-44(43-34(47)32(38(4,5)6)42-36(49)51-8)23-26-17-19-27(20-18-26)28-16-12-13-21-39-28/h9-21,29-32,45H,22-24H2,1-8H3,(H,40,46)(H,41,48)(H,42,49)(H,43,47)/t29-,30-,31+,32+/m0/s1 checkY
  • Key:AXRYRYVKAWYZBR-GASGPIRDSA-N checkY
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Atazanavir, sold under the brand name Reyataz among others, is an

by mouth.[2]

Common side effects include

HIV protease.[2]

Atazanavir was approved for medical use in the United States in 2003.[2] It is on the World Health Organization's List of Essential Medicines.[7] As of 2017 there is a generic version available in the United States manufactured by Teva Pharmaceuticals[8]

Medical uses

Two Reyataz 200 mg capsules

Atazanavir is used in the treatment of HIV. The efficacy of atazanavir has been assessed in a number of well-designed trials in ART-naive and ART-experienced adults.[9]

Atazanavir is distinguished from other protease inhibitors in that it has lesser effects on lipid profile and appears to be less likely to cause lipodystrophy. There may be some cross-resistant with other protease inhibitors.[2] When boosted with ritonavir it is equivalent in potency to lopinavir for use in salvage therapy in people with a degree of drug resistance, although boosting with ritonavir reduces the metabolic advantages of atazanavir.[medical citation needed]

Pregnancy

No evidence of harm has been found among pregnant women taking atazanavir. It is one of the preferred HIV medications to use in pregnant women who have not taken an HIV medication before.[10] It was not associated with any birth defects among over 2,500 live births observed. Atazanavir resulted in a better cholesterol profile and confirmed that it is a safe option during pregnancy.[10]

Contraindications

Atazanavir is contraindicated in those with previous hypersensitivity (e.g.,

rifampin, irinotecan, lurasidone, pimozide, triazolam, orally administered midazolam, ergot derivatives, cisapride, St. John's wort, lovastatin, simvastatin, sildenafil, indinavir, or nevirapine.[11]

Atazanavir inhibits the enzyme UDP glucuronosyltransferase (UGT) 1A1, thereby impacting the hepatic glucuronidation and elimination of bilirubin.[12] As such atazanavir may not be prescribed to patients with UGT1A1 deficiencies (e.g. those who suffer from Gilbert's syndrome or Crigler–Najjar syndrome) in order to avoid the possibility of jaundice.[12]

Adverse effects

Common side effects include: nausea, jaundice, rash, headache, abdominal pain, vomiting, insomnia, peripheral neurologic symptoms, dizziness, muscle pain, diarrhea, depression and fever.[11] Bilirubin levels in the blood are normally asymptomatically raised with atazanavir, but can sometimes lead to jaundice.[citation needed]

Mechanism of action

Atazanavir binds to the active site HIV protease and prevents it from cleaving the pro-form of viral proteins into the working machinery of the virus.[13] If the HIV protease enzyme does not work, the virus is not infectious, and no mature virions are made.[14][15] The azapeptide drug was designed as an analog of the peptide chain substrate that HIV protease would cleave normally into active viral proteins. More specifically, atazanavir is a structural analog of the transition state during which the bond between a phenylalanine and proline is broken.[16][17] Humans do not have any enzymes that break bonds between phenylalanine and proline, so this drug will not target human enzymes.[citation needed]

References

  1. ^ "Atazanavir". MedlinePlus. National Institutes of Health. 15 October 2012. Archived from the original on 2 August 2013. Retrieved 3 August 2013.
  2. ^ a b c d e f g h i j k "Atazanavir Sulfate". The American Society of Health-System Pharmacists. Archived from the original on 20 December 2016. Retrieved 28 November 2016.
  3. ^ "Atazanavir (Reyataz) Use During Pregnancy". Drugs.com. 27 February 2020. Retrieved 15 September 2020.
  4. FDA
    . Retrieved 22 October 2023.
  5. ^ "Prescription medicines: registration of new generic medicines and biosimilar medicines, 2017". Therapeutic Goods Administration (TGA). 21 June 2022. Retrieved 30 March 2024.
  6. ^ "Product monograph brand safety updates". Health Canada. 7 July 2016. Retrieved 3 April 2024.
  7. hdl:10665/325771
    . WHO/MVP/EMP/IAU/2019.06. License: CC BY-NC-SA 3.0 IGO.
  8. ^ "Teva Announces Exclusive Launch of a Generic Version of Reyataz in the United States" (Press release). Teva. 27 December 2017. Retrieved 29 September 2021 – via Business Wire.
  9. S2CID 195685320
    .
  10. ^ a b "What's New in the Guidelines? | Adult and Adolescent ARV Guidelines". AIDSinfo. Archived from the original on 15 November 2016. Retrieved 10 November 2016.
  11. ^ a b "Reyataz Package Insert" (PDF). Drugs@FDA. Food and Drug Administration. September 2016. Archived (PDF) from the original on 11 November 2016. Retrieved 10 November 2016.
  12. ^
    PMID 26417955
    .
  13. ^ "Atazanavir". DrugBank. 9 November 2016. Archived from the original on 9 November 2016.
  14. PMID 3290901
    .
  15. PMID 25897264
    .
  16. ^ Graziani AL (17 June 2014). "HIV protease inhibitors". UpToDate.
  17. PMID 9719591
    .
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