While on treatment with TRISENOX, you may experience some of the following reactions: common side effects (greater than or equal to 1 in 100 but less than 1 in 10): fatigue (weariness), increased blood sugar, shortness of breath, cough, headache. uncommon side effects (greater than or equal to 1 in 1000 but less than 1 in 100): increased white blood cell count, Herpes zoster, pneumonia, sepsis, anaemia, dehydration, confusion, blurry vision, cardiac failure, hypotension, pneumonitis, chills, renal failure, increased weight, nausea, vomiting, diarrhoea, stomach ache, oedema (water retention), rash or itching, change in your heart rhythm or dizziness.