The most common side effects with Viraferon in adults (seen in more than 1 patient in 10) are leucopenia (low white blood cell counts), anorexia (loss of appetite), depression, insomnia (difficulty lon sleeping), anxiety, agitation, nervousness, dizziness, headache, impaired concentration, dry mouth, blurred vision, nausea (feeling sick) or vomiting, abdominal (tummy) pain, diarrhoea, stomatitis (inflammation of the lining of the mouth), dyspepsia (indigestion), alopecia (hair loss), increased sweating, myalgia (muscle pain), arthralgia (joint pain), musculoskeletal pain (pain in the muscles and bones), inflammation at the site of the injection, fatigue (tiredness), rigors (shaking chills), fever, flu- no