1. Use of known strong or moderate inducers of cytochrome P450 3A (CYP3A) in participants receiving ombitasvir/paritaprevir/ritonavir (OBV/PTV/r) with and without dasabuvir (DSV), strong inducers and inhibitors (e.g., gemfibrozil) of cytochrome P450 2C8 (CYP2C8) in participants receiving OBV/PTV/r with DSV, medications contraindicated for ritonavir or RBV (for those that receive RBV) within 2 weeks or 10 half-lives (if known), whichever is longer, prior to study drug . For medications contraindicated with AbbVie's 2-direct-acting antiviral agent (2-DAA) and 3-DAA regimen, refer to the recommended prescribing information section of the approved local product labels.