Hi and welcome to HCM.
Yes this is true unfortunately, but this isnt a reason to stop taking it. Hep C causes much serious liver damage
. You should treat hep c primary. I know that there is a minor chance that you are able to stop with subutex and you must consider all this as the best solution. You should follow doctors recommendations, rest, and do frequent liver check ups. Hep c is unpredictable disease and has its positive and negative phases. You need to hope for the best and nit to give up.
Wish you good health