Very commonly reported side effects (at least 1 in every 10 patients): irritation or redness at the site of injection, headache, tired feeling, shaking chills, fever, flu-like symptoms, dizziness, nausea, loss of appetite, diarrhoea, stomach pain, vomiting, muscle aches, pain in joints and muscles, feeling depressed or irritable, trouble falling asleep or staying asleep, mood swings, virus infection, hair loss, rash, pharyngitis (sore throat), decrease in the number of red blood cells or decrease in certain white blood cells called neutrophils that fight infection, change in thyroid gland activity (which may make you feel tired or, less commonly, energetic), feeling unwell, and decrease in their rate of growth (height and weight).