See also How to Use section.

Drug interactions may change how your medications work or increase your risk for serious side effects. This document does not contain all possible drug interactions. Keep a list of all the products you use (including prescription/nonprescription drugs and herbal products) and share it with your doctor and pharmacist. Do not start, stop, or change the dosage of any medicines without your doctor's approval.

A product that may interact with this drug is: amiodarone.

This medication can slow down the removal of other medications from your body, which may affect how they work. One example is topotecan, among others.

Other medications can affect the removal of sofosbuvir/velpatasvir from your body, which may affect how this medication works. Examples include apalutamide, efavirenz, rifamycins (such as rifampin, rifabutin), St. John's wort, tipranavir/ritonavir, drugs used to treat seizures (such as phenobarbital, carbamazepine, phenytoin, primidone), among others.

Do not take this medication with other products that contain sofosbuvir.