The most commonly reported side effects with TRISENOX (seen in between 1 and 10 patients in 100) are neutropenia (low levels of white blood cells), thrombocytopenia (low levels of platelets), hyperglycaemia (raised blood sugar levels), hypokalaemia (low blood potassium levels), paraesthesia (pins and needles), pleuritic pain (chest pain), dyspnoea (breathlessness), bone pain, arthralgia (joint pain), pyrexia (fever), fatigue (tiredness), prolonged QT interval on an electrocardiogram (irregular heart beat), and increased levels of alanine aminotransferase and aspartate aminotransferase (liver enzymes).