Used for the acute treatment of migraine attacks with or without aura in adults. It works by narrowing blood vessels around the brain and reducing substances that trigger headache pain, nausea, sensitivity to light and sound, and other migraine symptoms. It is not intended for the prevention of migraines or for use in hemiplegic or basilar migraines. Most effective when taken at the first sign of a migraine. Should not be used for other types of headaches like tension or cluster headaches.