This article presents a prospective study of 71 patients infected with chronic viral hepatitis C and treated with interferon alpha during one year. The objective was to assess the incidence and predictive factors of anxiety and depression symptoms during and after the therapy. Each patient received psychiatric assessment before, during and after treatment, with evaluations using Hamilton-anxiety and MADRS scales. Results confirm the great incidence of depression and anxiety not only during interferon alpha therapy but also after treatment is discontinued. Sleep disorders and MADRS ratings of M4 seem to be predictive of the therapy's side effects. Thus, there seem to be easily discernable parameters allowing depression and suicidal behaviour to be anticipated. This paper emphasises their possible occurrence after the treatment and, therefore, the need for routine assessments after treatment is discontinued. Teams comprising both hepatologists and psychiatrists should complete these assessments. This shows the necessity of interdisciplinary collaboration treatment of this kind.

Adverse effects of interferon (IFN) treatment are common, and efforts to minimize these reactions are of considerable importance. IFN-beta-1a is an established therapy for patients with relapsing-remitting multiple sclerosis (MS). Its psychiatric side effects are debated and not yet fully established. The authors report here the case of a patient on IFN-beta-1a therapy for MS who developed acute delirium, delusion, and depression that ceased with treatment discontinuation. Although he had a history of recurrent major depressive disorder, his prior psychiatric illness had followed a course that was clinically independent of other signs of MS. This observation points out psychiatric vulnerability of patients taking IFN-beta-1a therapy for MS and suggests that IFN-beta-1a may induce or exacerbate preexisting psychotic symptoms.