Tell your doctor before treatment if you have or have recently had any of the following, as your doctor will need to take account of these when prescribing your dose: • a head injury, because Rapinyl may cover up the extent of the injury • breathing problems or suffer from myasthenia gravis (a condition characterised by muscle weakness) • a slow heart rate or low blood pressure • liver or kidney disease, as this may require your doctor to more carefully adjust your dose • a brain tumour and/ or raised intracranial pressure (an increase of pressure in the brain which causes severe headache, a feeling of sickness and blurred vision) • mouth wounds or mucositis (swelling and redness of the inside of the mouth)