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Sunday, 8 December 2013

Sofosbuvir

Sofosbuvir (brand names Sovaldi and Virunon) is a drug used for hepatitis C, with a high cure rate.

It inhibits the RNA polymerase that the hepatitis C virus uses to replicate its RNA.
It was discovered at Pharmasset and then acquired for development by Gilead Sciences.

On 6th December 2013, the U.S. Food and Drug Administration approved Sovaldi for the treatment of chronic hepatitis C.

Sofosbuvir will cost $84,000 for 12 weeks of treatment used for genotype 1 and 2, and $168,000 for the 24 weeks used for genotype 3.

Mechanism of Action
Sofosbuvir is a prodrug that is metabolized to the active antiviral agent 2'-deoxy-2'-α-fluoro-β-C-methyluridine-5'-monophosphate. Sofosbuvir is a nucleotide analogue inhibitor of the hepatitis C virus (HCV) polymerase. The HCV polymerase or NS5B protein is a RNA-dependent RNA polymerase critical for the viral cycle.

Clinical studies
Sofosbuvir is being studied in combination with pegylated interferon and ribavirin, with ribavirin alone, and with other direct-acting antiviral agents. It has shown excellent clinical efficacy when used either with pegylated interferon/ribavirin or in interferon-free combinations. In particular, combinations of sofosbuvir with NS5A inhibitors, such as daclatasvir or GS-5885, have shown sustained virological response rates of up to 100% in people infected with HCV.

Data from the ELECTRON trial showed that a dual interferon-free regimen of sofosbuvir plus ribavirin produced a 24-week post-treatment sustained virological response (SVR24) rate of 100% for previously untreated patients with HCV genotypes 2 or 3.

Data presented at the 20th Conference on Retroviruses and Opportunistic Infections in March 2013 showed that a triple regimen of sofosbuvir, ledipasvir, and ribavirin produced a 12-week post-treatment sustained virological response (SVR12) rate of 100% for both treatment-naive patients and prior non-responders with HCV genotype 1. Gilead has developed a sofosbuvir + ledipasvir coformulation that is being tested with and without ribavirin.

Sofosbuvir - wikipedia
Sovaldi - Drugs.com

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