It is indispensable that headaches will hit you at one point or another. Sumatriptan is one of the drugs used in treating occasional headaches. The drug can also be used in treating even the severest headaches. Sumatriptan works by narrowing the veins in the head hence allowing for ample flow of blood. Sumatriptan is a prescription drug that is used to treat migraines, a condition characterized by severe, throbbing headaches. Sumatriptan helps relieve the headache, pain and other symptoms associated with migraines such as vomiting, nausea, and sensitivity to light. Sumatriptan is categorized under a class of medications called triptans. Sumatriptan works by affecting the activities of a particular chemical (serotonin) that causes blood vessels in the brain to shrink. Sumatriptan may also help reduce pain by affecting specific nerves in the brain. Using Sumatriptan does not prevent future migraines or decrease the number of times you experience migraines.