De hyppigst forekommende bivirkninger ved ViraferonPeg (der ses hos flere end 1 ud af hver 10 patienter) er virusinfektion, vægttab, depression, irritabilitet, søvnbesvær, angst, nedsat koncentrationsevne, emotionel labilitet (humørsvingninger), hovedpine, mundtørhed, dyspnø (åndenød), pharyngitis (ondt i halsen), hoste, opkastning, kvalme, mavesmerter, diarré, anoreksi (appetitløshed), hårtab, kløe, tør hud, udslæt, myalgi (muskelsmerter), ledsmerter, smerter i muskler og knogler, inflammation på injektionsstedet, reaktioner på injektionsstedet (smerte og rødmen), svimmelhed, træthed, kulderystelser, feber, influenzalignende symptomer og asteni (kraftesløshed).
The most common side effects with ViraferonPeg (seen in more than 1 patient in 10) are viral infection, weight loss, depression, irritability, insomnia (difficulty sleeping), anxiety, impaired concentration, emotional lability (mood swings), headache, dry mouth, dyspnoea (difficulty breathing), pharyngitis (sore throat), coughing, vomiting, nausea (feeling sick), abdominal (tummy) pain, diarrhoea, anorexia (loss of appetite), alopecia (hair loss), pruritus (itching), dry skin, rash, myalgia (muscle pain), arthralgia (joint pain), musculoskeletal pain (pain in the muscles and bones), inflammation at the site of the injection, injection site reaction (pain and redness), dizziness, fatigue (tiredness), rigors (shaking chills), fever, flu-like symptoms and asthenia (weakness).