The FDA approved Viekira Pak (ombitasvir, paritaprevir and ritonavir tablets co-packaged with dasabuvir tablets) to treat patients with chronic hepatitis C virus (HCV) genotype 1 infection, including those with a type of advanced liver disease called cirrhosis.
Hepatitis C is a viral disease that causes inflammation of the liver than can lead to reduced liver function, liver failure or liver cancer. Most people infected with HCV have no symptoms of the disease until liver damage becomes apparent, which may take decades.
Viekira Pak contains three new drugs – ombitasvir, paritaprevir and dasabuvir – that work together to inhibit growth of HCV. It also contains ritonavir, a previously approved drug, which is used to increase blood levels of paritaprevir. Viekira Pak can be used with or without ribavirin, but it is not recommended for patients whose liver is unable to function properly (decompensated cirrhosis).
Viekira Pak is the fourth drug product approved by the FDA in the past year to treat chronic HCV infection. The FDA approved Olysio (simeprevir) in November 2013, Sovaldi (sofosbuvir) in December 2013 and Harvoni (ledipasvir and sofosbuvir) in October 2014.
Viekira Pak’s efficacy was evaluated in six clinical trials enrolling 2,308 participants with chronic HCV infection with and without cirrhosis. In different trials, participants were randomly assigned to receive Viekira Pak or placebo (sugar pill); Viekira Pak with or without ribavirin; or Viekira Pak with ribavirin for 12 or 24 weeks.
The trials were designed to measure whether the hepatitis C virus was no longer detected in the blood at least 12 weeks after finishing treatment (sustained virologic response, or SVR), indicating that a participant’s HCV infection has been cured. Results from multiple populations, including those considered difficult to treat, showed 91 to 100 percent of participants who received Viekira Pak at the recommended dosing achieved SVR. The recommended dosing for Viekira Pak is two ombitasvir, paritaprevir, ritonavir 12.5 milligrams (mg)/75 mg/50 mg tablets once daily and one dasabuvir 250 mg tablet twice daily.
The most common side effects reported in clinical trial participants were lethargy, itching, feeling weak or lack of energy, nausea and trouble sleeping.
Viekira Pak is marketed by AbbVie Inc., based in North Chicago, Illinois. Olysio is marketed by Raritan, New Jersey-based Janssen Pharmaceuticals. Sovaldi and Harvoni are marketed by Gilead Sciences, based in Foster City, California.