Sumatriptan should not be used in patients who have: Hypersensitivity to any component of the preparation. A history of myocardial infarction Peripheral vascular disease or symptoms or signs consistent with ischaemic heart disease. Prinzmetal's angina/coronary vasospasm. Uncontrolled hypertension. Cerebrovascular accident or transient ischaemic attack. Severe hepatic impairment.