Viekira Pak is a multipill, antiviral containing a combination of dasabuvir, ombitasvir, paritaprevir, and ritonavir. These four drugs are antiviral medicines that prevent hepatitis C virus (HCV) cells from multiplying in your body. Viekira Pak is used to treat genotype 1 chronic hepatitis C in adults, including people with a certain type of cirrhosis. This medicine is sometimes given together with another drug called ribavirin. Viekira Pak may also be used for purposes not listed in this medication guide.