• Hypersensitivity to the active substance, to alpha interferons, or to any of the excipients • Autoimmune hepatitis • Severe hepatic dysfunction or decompensated cirrhosis of the liver • Neonates and young children up to 3 years old, because of the excipient benzyl alcohol (see section 4.4 for benzyl alcohol) • A history of severe pre-existing cardiac disease, including unstable or uncontrolled cardiac disease in the previous six months (see section 4.4) • Initiation of Pegasys is contraindicated in HIV-HCV patients with cirrhosis and a Child-Pugh score ≥ 6