Thank you for your query at DoctorSpring.com
You have chronic hepatitis C infection which has caused chronic liver disease. Peg interferon and Ribavirin have controlled the infection. I presume the HCV RNA was not detected 6 months after the completion of treatment which indicates that the infection is under control.
But the damage it has already caused is irreversible. If upper GI endoscopy was not done, please get it done to look for complications like esophageal varices.
Every 6 months you have to undergo ultrasound scan of the abdomen and serum alpha feto protein test.
Regarding the medications are concerned, the list of medicines is quite long to be discussed here. Even common medications like Tylenol can affect liver if taken more than the therapeutic dose. So the prudent thing to do is to avoid self medication and discuss with your gastro/hepatologist before taking any new medications.
Since the liver is already affected, you need to avoid things which can further damage the liver. This includes avoiding alcohol. Get vaccinated against hepatitis B infection. And as mentioned above do not take medications without consulting your doctor.
To improve liver functioning, you can take liver protective medications like silymarin especially if the liver panel is abnormal.
Let me know if you have any more questions.