Got a call from doc's office today my liver is at level F-3...F-4 is the worst so i am going to have to take Harvoni to kill the Hep C I have. My question is I know that CS makes anti-biotics work better can I take Havoni with CS? Dont know much about the drug and am not looking forward to taking the drug but got to do what a person has to do....please everyone if you are a baby boomer get tested for HepC....they found mine by accident they dont usually test for it unless the test is ordered.Thanks in advance, Debbie