CNS Drugs

, Volume 19, Issue 2, pp 105–123 | Cite as

Neuropsychiatric Adverse Effects of Interferon-α

Recognition and Management
  • Charles L. Raison
  • Marina Demetrashvili
  • Lucile Capuron
  • Andrew H. Miller
Therapy in Practice


Recombinant preparations of the cytokine interferon (IFN)-α are increasingly used to treat a number of medical conditions, including chronic viral hepatitis and several malignancies. Although frequently effective, IFNαα induces a variety of neuropsychiatric adverse effects, including an acute confusional state that develops rapidly after initiation of high-dose IFNαα, a depressive syndrome that develops more slowly over weeks to months of treatment, and manic conditions most often characterised by extreme irritability and agitation, but also occasionally by euphoria. Acute IFNαα-induced confusional states are typically characterised by disorientation, lethargy, somnolence, psychomotor retardation, difficulties with speaking and writing, parkinsonism and psychotic symptoms. Strategies for managing delirium should be employed, including treatment of contributing medical conditions, use of either typical or atypical antipsychotic agents and avoidance of medications likely to worsen mental status. Significant depressive symptoms occur in 21–58% of patients receiving IFNαα, with symptoms typically manifesting over the first several months of treatment. The most replicated risk factor for developing depression is the presence of mood and anxiety symptoms prior to treatment. Other potential, but less frequently replicated, risk factors include a past history of major depression, being female and increasing IFNα dosage and treatment duration. The available data support two approaches to the pharmacological management of IFNα-induced depression: antidepressant pretreatment or symptomatic treatment once IFNα has been initiated. Pretreatment might be best reserved for patients already receiving antidepressants or for patients who endorse depression or anxiety symptoms of mild or greater severity prior to therapy. Several recent studies demonstrate that antidepressants effectively treat IFNα-induced depression once it has developed, allowing the vast majority of subjects to complete treatment successfully. Recent data suggest that IFNα-induced depression may be composed of two overlapping syndromes: a depression-specific syndrome characterised by mood, anxiety and cognitive complaints, and a neurovegetative syndrome characterised by fatigue, anorexia, pain and psychomotor slowing. Depression-specific symptoms are highly responsive to serotonergic antidepressants, whereas neurovegetative symptoms are significantly less responsive to these agents. These symptoms may be more effectively treated by agents that modulate catecholaminergic functioning, such as combined serotonin-noradrenaline (norepinephrine) antidepressants, bupropion, psychostimulants or modafinil. Additional factors to consider in selecting an antidepressant include potential drug-drug interactions and adverse effect profile. Finally, IFNα appears capable of inducing manic symptoms. Mania, especially when severe, is a clinical emergency. When this occurs, IFNα and antidepressants should be stopped, an emergency psychiatric consultation should be obtained, and treatment with a mood stabiliser should be initiated.



The authors would like to thank Bobbi J. Woolwine for her support in the preparation of this article. This work was supported in part by the National Institute of Mental Health (MH64619, MH069124 and MH60723) and the Centers for Disease Control and Prevention. Potential conflicts of interest: Charles L. Raison, MD, Speakers’ Bureau for Schering Plough, Wyeth and Eli Lilly; Marina Demetrashvili, no relationships to disclose; Lucile Capuron, no relationships to disclose; Andrew H. Miller, no relationships to disclose.


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Copyright information

© Adis Data Information BV 2005

Authors and Affiliations

  • Charles L. Raison
    • 1
  • Marina Demetrashvili
    • 1
  • Lucile Capuron
    • 1
  • Andrew H. Miller
    • 1
  1. 1.Department of Psychiatry and Behavioral SciencesEmory University School of MedicineAtlantaUSA

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