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ZEPATIER
Viral infections
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Drug Name:

ZEPATIER Rx

Generic Name and Formulations:
Elbasvir, grazoprevir 50mg/100mg; tabs.

Company:
Merck & Co., Inc.

Therapeutic Use:

Indications for ZEPATIER:

Chronic HCV genotypes 1 or 4 infection with or without ribavirin (RBV).

Adult:

Test for HBV infection prior to initiation. ≥18yrs: 1 tab once daily. Genotype 1a: treatment-naive or PegIFN/RBV-experienced without baseline NS5A polymorphisms: treat for 12 weeks; with baseline NS5A polymorphisms: take with RBV for 16 weeks. Genotype 1b: treatment-naive or PegIFN/RBV-experienced: treat for 12 weeks. Genotype 1a or 1b: PegIFN/RBV/HCV NS3/4A protease inhibitor (PI)-experienced: take with RBV for 12 weeks. Genotype 4: treatment-naive: treat for 12 weeks; if PegIFN/RBV-experienced: take with RBV for 16 weeks. HCV/HIV-1 co-infected with or without cirrhosis, renal impairment including hemodialysis: follow same dosage regimen. See full labeling.

Children:

<18yrs: not established.

Contraindications:

Moderate or severe hepatic impairment. Concomitant OATP1B1/3 inhibitors (eg, atazanavir, darunavir, lopinavir, saquinavir, tipranavir, cyclosporine), strong CYP3A4 inducers (eg, phenytoin, carbamazepine, rifampin, St. John’s wort), efavirenz. When coadministered with ribavirin, its contraindications also apply to this combination regimen (eg, Pregnancy Cat.X).

Warnings/Precautions:

Risk of HBV reactivation in patients coinfected with HCV/HBV. Test all patients for HBV infection by measuring HBsAg and anti-HBc; if positive serologic evidence, monitor for hepatitis flare or HBV reactivation during and at post-treatment follow-up; treat if clinically indicated. HCV genotype 1a: test for presence of virus with NS5A resistance-associated polymorphisms prior to initiation. Monitor hepatic function prior to initiation, at Week 8, and as clinically indicated; perform additional testing at Week 12 for patients receiving 16 weeks of therapy. Consider discontinuing if ALT persistently >10XULN. Discontinue if ALT elevation is accompanied with liver inflammation or increasing conjugated bilirubin, alkaline phosphatase, or INR. Liver transplant. Pregnancy. Nursing mothers.

Interactions:

See Contraindications. Concomitant moderate CYP3A inducers or certain strong CYP3A inhibitors: not recommended. Concomitant certain immunosuppressants or chemotherapeutic agents: may increase risk of HBV reactivation. May be antagonized by nafcillin, bosentan, etravirine, modafinil. May be potentiated by ketoconazole, elvitegravir/cobicistat/emtricitabine/tenofovir disoproxil fumarate or tenofovir alafenamide. Potentiates tacrolimus (monitor tacrolimus levels, changes in renal function), atorvastatin (limit max 20mg/day), rosuvastatin (limit max 10mg/day). May potentiate fluvastatin, lovastatin, simvastatin; use lowest effective dose of these drugs.

Pharmacological Class:

HCV NS5A inhibitor + HCV NS3/4A protease inhibitor.

Adverse Reactions:

Fatigue, headache, nausea, diarrhea, anemia.

Note:

For ribavirin specific dosing and safety information, refer to the full prescribing information.

Generic Availability:

NO

How Supplied:

Carton—2 x 14 dose packs

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