Increased exposure of medicinal products that are substrates of P-gp, BCRP, OATP1B1 & OATP1B3 drug transporters. Decreased plasma conc w/ strong inducers of P-gp &/or CYP2B6, CYP2C8, or CYP3A4 eg, carbamazepine, phenobarb, phenytoin, rifampicin, rifabutin & St. John's wort; moderate P-gp &/or CYP inducers eg, efavirenz, modafinil, oxcarbazepine or rifapentine. Increased plasma conc w/ inhibitors of P-gp or BCRP. Close monitoring of INR is recommended in patients treated w/ vit K antagonists. Pharmacokinetics of drugs metabolized by the liver [eg, immunosuppressive agents (eg, calcineurin inhibitors)] may be impacted by changes in liver function during therapy. Increased exposure of dabigatran; tenofovir disoproxil fumarate. Velpatasvir: Increased plasma conc w/ inhibitors of OATP, CYP2B6, CYP2C8, or CYP3A4. Decreased conc w/ acid-reducing agents eg, antacids (eg, Al or Mg hydroxide, Ca carbonate), H
2-receptor antagonists (eg, famotidine, cimetidine, nizatidine, ranitidine), PPIs (eg, omeprazole, lansoprazole, rabeprazole, pantoprazole, esomeprazole); oxcarbazepine; rifapentine; efavirenz/emtricitabine/tenofovir disoproxil fumarate. Increased conc of digoxin; rosuvastatin.