What side effects are associated with interferon alfa-2b injections?

Many; see below: Many of patients experience flu-like symptoms like fever, chills, headache, fatigue, and weakness within 1-2 hours of taking the medication. Symptoms like irregular heartbeat, chest pressure or tightness, hallucinations, irritability, insomnia, depressive mood, and suicidal thoughts may also occur. It’s important to report any of these to your doctor.