Sumatriptan (Imigran) works by reversing the expansion of blood vessels around the brain present in migraine. The most widely used 'triptan' is Imigran, which is a brand name for the drug Sumatriptan.
Sumatriptan 20mg
Use 1 spray (20 mg) into one nostril at onset of symptoms, dose may be repeated once after at least 2 hours if migraine symptoms come back. Maximum dose in 24 hours is 40mg.
Sumtriptan (Imigran) can cause a temporary narrowing of blood vessels. People who have had strokes or mini-strokes, have problems with poor circulation, or a history of angina (heart pain on exertion) or a have had heart attacks should not take sumatriptan.