there's no interferon and there are no complex regimens. tell your doctor if you have other liver or kidney problems, or other medical conditions. and about all the medicines you take including herbal supplements. harvoni should not be taken with any medicines containing amiodarone, rifampin, or st. john's wort. it also should not be taken with any other medicine that contains sovaldi. side effects may include tiredness and headache. i am ready to put hep c behind me. i am ready to be cured. are you ready? ask your hep c specialist if harvoni is right for you.