This medicine is a cerebral vasoconstrictor used to relieve migraine headache attacks as they occur. It will not prevent or reduce the number of attacks you experience.
The FDA, due to the current state of their regulations, has taken the position that virtually all shipments of prescription drugs imported from a Canadian pharmacy by a U.S. consumer will violate the law.
Imitrex (Sumatriptan) 
Prescription Required
