Peginterferon alfa-2a is made from human proteins that help the body fight viral infections. Peginterferon alfa-2a is used to treat chronic hepatitis B or C in adults, and to treat chronic hepatitis C in children who are at least 5 years old. Peginterferon alfa-2a is often used together with another medication called ribavirin (Copegus, RibaPak, Ribasphere, RibaTab). Peginterferon alfa-2a may also be used for purposes not listed in this medication guide.
Pegasys, singularly or in combination, is used to treat viral infections such as Hepatitis B & C. Pegasys works by reducing some of the virus while also teaming with your immune system to battle the infection.