Prevention of peginterferon-induced psychopathology with selective serotonin reuptake inhibitors (SSRI's) (paroxetine) has been shown to be effective in patients treated with interferon for malignant disease. The aim is to study the effects of prophylactic treatment with escitalopram (another SSRI) on peginterferon-associated psychopathology in patients treated with peginterferon and ribavirin for chronic hepatitis C.