In studies, the most common side effects with Sprycel (seen in more than 1 patient in 10) were headache, pleural effusion (fluid around the lungs), dyspnoea (shortness of breath), cough, diarrhoea, nausea (feeling sick), vomiting, abdominal (tummy) pain, skin rash, musculoskeletal pain (pain in the joints and muscles), infection, haemorrhage (bleeding), superficial oedema (swelling), fatigue (tiredness), pyrexia (fever), neutropenia (low white blood cell counts), thrombocytopenia (low blood platelet counts) and anaemia (low red blood cell counts).