Very rarely (affects less than 1 patient in 10,000), patients have experienced gastrointestinal haemorrhage (blood in stools or when vomiting), urinary tract infection, inflammation of the pancreas (severe upper stomach pain, often with nausea and vomiting), problems with heart rhythm (both fast and slow), high blood pressure, hallucinations, worsening of Parkinson’ s disease or development of similar symptoms (muscle stiffness, difficulty in carrying out movements).