Victrelis is a prescription medicine used with the medicines peginterferon alfa and ribavirin to treat chronic (long-lasting) hepatitis C genotype 1 infection in adults with stable (compensated) liver disease who have not been treated before or who have failed previous treatment. Victrelis is a hepatitis C virus (HCV) NS3/4A protease inhibitor. Victrelis comes as a capsule to take by mouth and is usually taken with a meal or light snack three times a day (every 7 to 9 hours). Victrelis must be administered in combination with peginterferon alfa and ribavirin. Some common side effects of Victrelis include tiredness, nausea, headache and change in taste.