Please consult your physician before taking any medication. Imitrex Generic 100mg 2 Tabs Generic name: Sumatriptan succinate Brand names: Imitrex Why is Imitrex prescribed? Imitrex is prescribed for the treatment of a migraine attack with or without the presence of an aura (visual disturbances, usually sensations of halos or flickering lights, which precede an attack). The injectable form is also used to relieve cluster headache attacks. (Cluster headaches come on in waves, then disappear for long periods of time. They are limited to one side of the head, and occur mainly in men.) Imitrex cuts headaches short. It will not reduce the number of attacks you experience.