Before taking elbasvir and grazoprevir,
tell your doctor and pharmacist if you are allergic to elbasvir, grazoprevir, any other medications, or any of the ingredients in elbasvir and grazoprevir tablets. Ask your pharmacist for a list of the ingredients.
tell your doctor if you are taking atazanavir (Reyataz), carbamazepine (Carbatrol, Epitol, Equetro, Tegretol), cyclosporine (Gengraf, Neoral, Sandimmune), darunavir (Prezista, in Prezcobix), efavirenz (Sustiva, in Atripla), lopinavir (in Kaletra), phenytoin (Dilantin, Phenytek), rifampin (Rifadin, Rimactane, in Rifamate, in Rifater), saquinavir (Invirase), St. John's wort, or tipranavir (Aptivus). Your doctor will probably tell you not to take elbasvir and grazoprevir if you are taking one or more of these medications.
tell your doctor and pharmacist what other prescription and nonprescription medications, vitamins, nutritional supplements, and herbal products you are taking or plan to take. Be sure to mention any of the following: bosentan (Tracleer); cobicistat taken along with elvitegravir, emtricitabine, and tenofovir (Genvoya, Stribild); etravirine (Intelence); medications to treat high cholesterol such as atorvastatin (Lipitor, in Caduet), fluvastatin (Lescol XL), lovastatin (Altoprev), rosuvastatin (Crestor), and simvastatin (Zocor, in Vytorin); ketoconazole; modafinil (Provigil); nafcillin; tacrolimus (Astagraf, Envarsus, Prograf, others); and warfarin (Coumadin, Jantoven). Your doctor may need to change the doses of your medications or monitor you carefully for side effects. Many other medications may also interact with elbasvir and grazoprevir, so be sure to tell your doctor about all the medications you are taking, even those that do not appear on this list.
tell your doctor if you have or have ever had any type of liver disease other than hepatitis C. Your doctor may tell you not to take elbasvir and grazoprevir.
tell your doctor if you have had or are waiting for a liver transplant or if you have human immunodeficiency virus (HIV).
tell your doctor if you are pregnant, plan to become pregnant, or are breastfeeding. If you become pregnant while taking elbasvir and grazoprevir, call your doctor.