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phenobarbital will lower the level or influence of ombitasvir/paritaprevir/ritonavir & dasabuvir (DSC) by influencing hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated. Potent CYP3A4 inducers might lessen partiaprevir and ritonavir concentrations, and for that reason reduced efficacy of Viekira PakResulting from inconsistencies in betwee