Patients must be in good health with no contraindications to the use of sumatriptan such as either having or having increased risk factors for CAD or CVD. They may not take during the time of the study preventive medications that are 5HT1B/1D agonists. Episodic use of triptans, ergotamine, or dihydroergotamine is permitted provided they are not used within 24 hours of use of the study medication.