In vitro activity: Paritaprevir (formerly known as ABT-450 and/or Veruprevir), an acylsulfonamide structurally, is a potent non-structural protein 3/4A (NS3/4A) protease inhibitor with EC50 values of 1 and 0.21 nM for HCV 1a and 1b, respectively. It is discovered by Abbott Laboratories that shows promising results as a treatment of hepatitis C. Paritaprevir demonstrates in vitro antiviral activity against HCV GT1-4 and GT6 (EC50 range, 0.09 to 19 nM), with an EC50 of 0.09 nM against GT4a. When given in combination with ritonavir and ribavirin for 12 weeks, the rate of sustained virologic response at 24 weeks after treatment has been estimated to be 95% for those with hepatitis C virus genotype 1. Resistance to treatment with paritaprevir is uncommon, because it targets the binding site, but has been seen to arise due to mutations at positions 155 and 168 in NS3. Paritaprevir is a component of Viekira Pak and Technivie.

Kinase Assay: Paritaprevir demonstrates in vitro antiviral activity against HCV GT1-4 and GT6 (EC50 range, 0.09 to 19 nM), with an EC50 of 0.09 nM against GT4a