The most common side effects with Ceplene (seen in more than 1 patient in 10) are eosinophilia (an increase in eosinophil levels, a type of white blood cell), thrombocytopenia (low blood platelet counts), headache, dizziness, dysgeusia (a bitter or unusual taste in the mouth), tachycardia (rapid heart beat), flushing (reddening), hypotension (low blood pressure), cough, dyspnoea (shortness of breath), nausea (feeling sick), dyspepsia (indigestion), diarrhoea, rash, arthralgia (pain in the joints), myalgia (muscle pain), pyrexia (fever), rigors (shaking chills), fatigue (tiredness), flu-like symptoms, feeling hot and injection site reaction (redness, bruising, pain and inflammation).