Other uncommon side effects are: high or low blood pressure abnormal heart rate or lack of blood flow to the heart discolouration or widening of the veins abnormally high or low levels of potassium in the blood high levels of sugar in the blood or sugar in the urine low levels of calcium in the blood high levels of the pigment bilirubin in the blood high levels of certain liver enzymes elevated moods or feelings of anxiousness sleepiness or trouble sleeping decrease or loss of appetite weakness, tiredness, fever or flu like symptoms numbness, burning, prickling or tingling sensations on the skin itchy skin rash impaired vision or eye irritation motion sickness ringing in the ear hiccups, flatulence, dry mouth or indigestion, abdominal (stomach) pain difficulty urinating joint pain electrocardiogram abnormalities (QT prolongation)