Pegylated interferon alfa-2a, sold under the brand name Pegasys among others, is medication used to treat hepatitis C and hepatitis B. For hepatitis C it is typically used together with ribavirin and cure rates are between 24 and 92%. For hepatitis B it may be used alone. It is given by injection under the skin...Wikipedia

Manufacturer's Website: Pegasys                                                                                                                          Average retail cost: $8,627/4 vials