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Subviral Agents01:29

Subviral Agents

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Subviral agents are infectious entities that resemble viruses but lack one or more viral components, such as a capsid or essential replication machinery. These agents include viroids, prions, and satellites, each possessing distinct structural and functional characteristics that influence their mode of infection and replication.Viroids are the simplest subviral agents, consisting of circular, single-stranded RNA molecules without a protein coat. They exclusively infect plants, relying entirely...
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Hepatitis is an inflammatory condition of the liver most commonly caused by hepatotropic viruses (A–E), though non-infectious causes such as alcohol and drugs also exist.Hepatitis AHepatitis A virus (HAV) is a non-enveloped RNA virus of the Picornaviridae family. It is primarily transmitted via the fecal-oral route, typically through ingestion of contaminated food or water. After ingestion, HAV enters the bloodstream through the oropharynx or intestinal epithelium and reaches the liver.
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Post-approval, manufacturers may modify an approved new or generic drug product. Such modifications can encompass alterations in the Active Pharmaceutical Ingredient (API), manufacturing process, formulation, batch size, manufacturing site, and container closure system (FDA Guidance for Industry, April 2004). Often, a drug product may undergo multiple changes.These modifications require careful evaluation to determine their potential impact on the drug product's identity, strength, quality,...
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Elbasvir/Grazoprevir: First Global Approval.

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Elbasvir/grazoprevir, a fixed-dose combination therapy, is now approved for treating chronic hepatitis C virus (HCV) genotypes 1 and 4. This milestone marks a significant advancement in HCV treatment options.

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Area of Science:

  • Hepatology
  • Virology
  • Pharmacology

Background:

  • Hepatitis C virus (HCV) infection remains a significant global health concern.
  • Chronic HCV infection can lead to serious liver conditions, including cirrhosis and hepatocellular carcinoma.
  • Effective antiviral therapies are crucial for managing and potentially curing HCV infection.

Purpose of the Study:

  • To summarize the key development milestones of elbasvir/grazoprevir.
  • To highlight the journey leading to the global approval of elbasvir/grazoprevir for specific HCV genotypes.
  • To provide an overview of this fixed-dose combination therapy for HCV treatment.

Main Methods:

  • Review of preclinical and clinical development data for elbasvir/grazoprevir.
  • Analysis of regulatory submission and approval processes.
  • Synthesis of information on the drug's mechanism of action and efficacy.

Main Results:

  • Elbasvir, an NS5A inhibitor, and grazoprevir, an NS3/4A protease inhibitor, form a fixed-dose combination.
  • The combination therapy (elbasvir/grazoprevir 50/100 mg) received US approval for chronic HCV genotypes 1 and 4.
  • This approval represents the first global regulatory milestone for this specific HCV treatment.

Conclusions:

  • Elbasvir/grazoprevir offers a new oral treatment option for patients with chronic HCV genotypes 1 or 4.
  • The development pathway highlights successful collaboration and rigorous evaluation leading to therapeutic advancement.
  • This approval signifies progress in the ongoing effort to combat the global burden of hepatitis C.