Migraine patients may experience repeated migraine attacks, lasting from four hours to three days or more. Each attack is characterized by severe pain, typically on one side of the head and often involves a number of other symptoms, including pain with a pulsating or throbbing quality, nausea or vomiting, sensitivity to light and sound, visual disturbances or aura. Currently the management of migraine may be either acute treatment or prophylaxis. Acute migraine treatment aims at aborting or reversing already present migraine symptoms with acute administration of medicine such as with triptans, whereas migraine prophylaxis aims to reduce the frequency and severity of migraine attacks over time through chronic medication.