What are the side effects of pegylated interferon-alpha for chronic hepatitis B?
Pegylated interferon-alpha (PegIFN-α) is an immunomodulatory therapy for chronic hepatitis B that can lead to a functional cure, but its use is limited by frequent side effects. These adverse reactions are a direct result of the drug's immune-activating mechanism and can affect multiple body systems. Common side effects include flu-like syndrome, low blood cell counts, autoimmune issues, and neuropsychiatric symptoms like depression. Many patients require dose modifications or treatment discontinuation due to these effects.
What the research says
PegIFN-α therapy is associated with a high frequency of multisystem adverse reactions, which are consequences of systemic immune activation 4. The most common side effect is a flu-like syndrome (fever, chills, muscle aches), which occurs in most patients. Bone marrow suppression leads to cytopenias (low red blood cells, white blood cells, or platelets) 47. Neuropsychiatric symptoms, particularly exacerbation of depression, are also common and can limit treatment 7. Autoimmune reactions, such as thyroid dysfunction or other autoimmune disorders, may occur due to loss of immune tolerance 4. Additionally, ocular vascular injury has been reported 4. In clinical trials, these side effects often lead to dose reductions or early discontinuation 47. For example, in a phase 2 study of PegIFN-α combined with other agents, 91% of participants completed the study, but side effects were monitored closely 3. The 2018 JAMA review notes that poor tolerability and adverse effects like bone marrow suppression and depression limit the use of pegylated interferon 7. A 2021 review confirms that side effects are common and include flu-like symptoms, cytopenias, and mood disturbances 8.
What to ask your doctor
- What are the most common side effects I might experience with pegylated interferon-alpha?
- How will my blood counts and mood be monitored during treatment?
- What should I do if I develop flu-like symptoms or signs of depression?
- Are there any specific autoimmune conditions I should watch for?
- How often will I need to have follow-up appointments to manage side effects?
This question is drawn from common patient questions about Gastroenterology and answered using cited medical research. We do not provide individualized advice.