Fosamprenavir

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Fosamprenavir, better known as Lexiva, (3nu4)

Better Known as: Lexiva or Telzir

  • Marketed By: Viiv Healthcare (Joint venture of Pfizer & GlaxoSmithKline)
  • Major Indication: Human Immunodeficiency Virus Infection
  • Drug Class: HIV Protease Inhibitor
  • Date of FDA Approval (Discontinued): 2003 (2017)
  • 2007 Sales: $240 Million
  • Importance: As a prodrug, It is rapidly metabolized by the liver into its active form, also known as Amprenavir. As a prodrug, it is a slow release form of Amprenavir, thus requiring less frequent dosing. It was one of the first instances of a successful drug stemming from joint ventures of major pharmaceutical companies.
  • See Pharmaceutical Drugs for more information about other drugs and diseases.

Mechanism of Action

Fosamprenavir is a potent HIV Protease inhibitor. As a prodrug form of Amprenavir, it has an identical mechanism of action as Amprenavir.

Drug Resistance

The biggest difficulty with treating HIV is the rapidity at which it mutates and becomes resistant to treatments. To view a comprehensive and interactive analysis of the mutations which confer drug resistance to HIV Protease, See: HIV Protease Inhibitor Resistance Profile

Pharmacokinetics

HIV Protease Inhibitor Pharmacokinetics
Parameter Ritonavir Tipranavir Indinavir Saquinavir Amprenavir Fosamprenavir Lopinavir Darunavir Atazanavir Nelfinavir
Tmax (hr) 4.4 ~3 1.5 3.7 .98 1.5-4 2 .5 2-4 3.1
Cmax (ng/ml) 13120 14600 8100 2297 4901 4820 11.9 2730 ~4393 4701
Bioavailability (%) -- -- 65 4 -- -- -- -- 68 20-80
Protein Binding (%) 99 >99 61 98 90 90 99 95 86 98
T1/2 (hr) 4.8 4.2 1.2 4.5 5.5 7.7 6.1 29.4 5.3 3.3
AUC (ng/ml/hr) 128100 46500 20900 13467 11999 35000 117600 4746 ~26045 31906
Clearance (L/h) ~8.4 32.4 49.5 36.7 56.8 84.4 1.7 32.8 13.6 37.3
Dosage (mg) 600 600 800 1000 600 1400 280 400 400 1250
Metabolism Hepatic (CYP3A4 & CYP2C19) Hepatic (CYP3A4) Hepatic (CYP3A4) Hepatic (CYP3A4 & CYP3A5) Hepatic (CYP3A4) Hepatic (CYP3A4) Hepatic (CYP3A4) Hepatic (CYP3A4) Hepatic (CYP3A4) Hepatic (CYP3A4)

For Pharmacokinetic Data References, See: References

References


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David Canner

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