Elbasvir And Grazoprevir
Elbasvir And Grazoprevir Uses, Dosage, Side Effects, Food Interaction and all others data.
Elbasvir is a direct-acting antiviral medication used as part of combination therapy to treat chronic hepatitis C, an infectious liver disease caused by infection with hepatitis C virus (HCV). HCV is a single-stranded RNA virus that is categorized into nine distinct genotypes, with genotype 1 being the most common in the United States, affecting 72% of all chronic HCV patients. Treatment options for chronic hepatitis C have advanced significantly since 2011, with the development of direct-acting antivirals (DAAs) such as elbasvir. Elbasvir is an inhibitor of NS5A, a protein essential for viral replication and virion assembly. The barrier to the development of resistance to NS5A inhibitors is lower than that of NS5B inhibitors, another class of DAAs. Substitutions at amino acid positions 28, 30, 31, or 93 are known to confer resistance to elbasvir. Despite this disadvantage elbasvir is still effective against HCV, particularly when paired with grazoprevir.
Elbasvir is available as a fixed-dose combination product with grazoprevir (tradename: Zepatier) used for the treatment of chronic hepatitis C. Approved in January 2016 by the FDA, Zepatier is indicated for the treatment of HCV genotypes 1 and 4 with or without ribavirin depending on the presence of resistance-associated amino acid substitutions in the NS5A protein and previous treatment failure with ribavirin, peginterferon alfa-2a, peginterferon alfa-2b, or other NS3/4A inhibitors like boceprevir, simeprevir, or telaprevir. Elbasvir and grazoprevir are used with or without ribavirin with the intent to cure, or achieve a sustained virologic response (SVR), and have been shown to achieve a SVR between 94% and 97% for genotype 1 and 97% and 100% for genotype 4 after 12 weeks of treatment.. SVR and eradication of HCV infection are associated with significant long-term health benefits including reduced liver-related damage, improved quality of life, reduced incidence of hepatocellular carcinoma, and reduced all-cause mortality.
In a computational target-based drug repurposing investigation published in April 2020, elbasvir was predicted to bind stably and preferentially to three proteins necessary for viral replication of SARS-CoV-2, the human coronavirus responsible for the COVID-19 pandemic. While these results are suggestive of antiviral efficacy, follow-up clinical trials are required to validate elbasvir as a potential therapy against SARS-CoV-2.
Grazoprevir is a direct acting antiviral medication used as part of combination therapy to treat chronic Hepatitis C, an infectious liver disease caused by infection with Hepatitis C Virus (HCV). HCV is a single-stranded RNA virus that is categorized into nine distinct genotypes, with genotype 1 being the most common in the United States, and affecting 72% of all chronic HCV patients . Treatment options for chronic Hepatitis C have advanced significantly since 2011, with the development of Direct Acting Antivirals (DAAs) such as Grazoprevir. Grazoprevir is an inhibitor of NS3/4A, a serine protease enzyme, encoded by HCV genotypes 1 and 4 . These enzymes are essential for viral replication and serve to cleave the virally encoded polyprotein into mature proteins like NS3, NS4A, NS4B, NS5A and NS5B . The barrier for develoment of resistance to NS3/4A inhibitors is lower than that of NS5B inhibitors, another class of DAAs . Subtitutions at amino acid positions 155, 156, or 168 are known to confer resistance. The substitutions of the enzyme's catalytic triad consisting of H58, D82, and S139 are also likely to alter the affinity of the drug for NS3/4A or the activity of the enzyme itself. Despite this disadvantage Grazoprevir is still effective against HCV particularly when paired with Elbasvir.
In a joint recommendation published in 2016, the American Association for the Study of Liver Diseases (AASLD) and the Infectious Diseases Society of America (IDSA) recommend Grazoprevir as first line therapy in combination with Elbasvir for genotypes 1a, 1b, and 4 of Hepatitis C . Grazoprevir and Elbasvir are used with or without Ribavirin with the intent to cure, or achieve a sustained virologic response (SVR), after 12 weeks of daily therapy. SVR and eradication of HCV infection is associated with significant long-term health benefits including reduced liver-related damage, improved quality of life, reduced incidence of Hepatocellular Carcinoma, and reduced all-cause mortality .
Grazoprevir is available as a fixed dose combination product with Elbasvir (tradename Zepatier) used for the treatment of chronic Hepatitis C. Approved in January 2016 by the FDA, Zepatier is indicated for the treatment of HCV genotypes 1 and 4 with or without Ribavirin depending on the the presence of resistance associated amino acid substitutions in the NS5A protein and previous treatment failure with Ribavirin, Peginterferon alfa-2a, Peginterferon alfa-2b, or other NS3/4A inhibitors like Boceprevir, Simeprevir, or Telaprevir . When combined together, Grazoprevir and Elbasvir as the combination product Zepatier have been shown to achieve a SVR between 94% and 97% for genotype 1 and 97% and 100% for genotype 4 after 12 weeks of treatment . It can be used in patients with compensated cirrhosis, human immunodeficiency virus co-infection, or severe kidney disease.
| Trade Name | Elbasvir And Grazoprevir |
| Generic | Elbasvir + grazoprevir |
| Weight | 50mg + 100mg |
| Type | Oral tablet |
| Therapeutic Class | |
| Manufacturer | |
| Available Country | United States |
| Last Updated: | September 19, 2023 at 7:00 am |
Uses
Elbasvir is an antiviral and NS5A inhibitor used to treat hepatitis C infections.
Elbasvir, when used in combination with grazoprevir as the combination product Zepatier, is indicated for use with or without ribavirin for the treatment of chronic HCV genotypes 1 or 4 infection in adults.
Grazoprevir is an antiviral and NS3/4A protease inhibitor used to treat hepatitis C infections.
Grazoprevir is indicated in combination with Elbasvir (as the fixed dose combination product Zepatier) with or without Ribavirin for treatment of chronic HCV genotypes 1a, 1b, or 4 infection in adults.
Elbasvir And Grazoprevir is also used to associated treatment for these conditions: Chronic Hepatitis C Genotype 1, Chronic hepatitis C genotype 1a, Chronic hepatitis C genotype 1b, Chronic hepatitis C genotype 3, Chronic hepatitis C genotype 4Chronic Hepatitis C Genotype 1, Chronic hepatitis C genotype 1a, Chronic hepatitis C genotype 1b, Chronic hepatitis C genotype 3, Chronic hepatitis C genotype 4
How Elbasvir And Grazoprevir works
Elbasvir is an inhibitor of the HCV non-structural protein 5A. While the precise role of this protein is unknown, it is essential to viral replication and virion assembly. Potential modes of action of NS5A inhibitors like elbasvir include blocking signaling interactions, redistribution of NS5A from the endoplasmic reticulum to the surface of lipid droplets, and modification of the HCV replication complex.
Computational target-based in silico research suggests that elbasvir may carry activity at several proteins required for replication of SARS-CoV-2 - namely RNA-dependent RNA polymerase, helicase, and papain-like proteinase - although specific activity has yet to be affirmed by follow-up clinical studies.
Grazoprevir is a second generation NS3/4a protease inhibitor used to inhibit viral HCV replication. NS3/4a protease is an integral part of viral replication and mediates the cleavage the virally encoded polyprotein to mature proteins (NS3, NS4A, NS4B, NS5A and NS5B) . Grazoprevir inhibits the NS3/4protease enzymes of HCV genotype 1a, 1B, and 4 with IC50 values of 7pM, 4pM, and 62pM, respectively.
Toxicity
The most commonly reported adverse reactions of all intensity (greater than or equal to 5% in placebo-controlled trials) were fatigue, headache, and nausea.
The most commonly reported adverse reactions of all intensity (greater than or equal to 5% in placebo-controlled trials) were fatigue, headache, and nausea .
Volume of Distribution
Elbasvir has an estimated apparent volume of distribution of 680 liters. It is thought to distribute into most tissues including the liver.
Grazoprevir has an estimated apparent volume of distribution of 1250 liters . It is thought to distribute primarily to the liver with its uptake facilitated by organic anion transporting polypeptide 1B1/3.
Elimination Route
Elbasvir reaches peak plasma concentration 3-6 hours after administration and has an absolute bioavailability of 32%. When co-administered with food, the peak concentration of elbasvir increases 1.5-fold, but this increase in exposure is not likely to be clinically relevant.
Grazoprevir reaches peak plasma concentration 0.5-3 hours after administration . Grazoprevir has an absolute bioavailability of 27%. When taken with food the peak concentration of Grazoprevir increases 2.8 fold but this increase in exposure has not been deemed clinically relevant.
Half Life
The geometric mean apparent terminal half-life for elbasvir is 24 hours in HCV-infected subjects.
The geometric mean apparent terminal half-life for Grazoprevir is 31 hours in HCV-infected subjects .
Clearance
The clearance of elbasvir has not been determined.
The clearance of Grazoprevir has not been determined .
Elimination Route
Elbasvir is mainly eliminated in the feces (90%) with very little eliminated in the urine (7
Grazoprevir is mainly eliminated in the feces (90%) with very little eliminated in the urine (Label.
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