Rizact 10 Tablet is a prescription medicine used in the treatment of acute attack of migraine. It relieves the symptoms of migraine and prevents the attack from becoming worse. This medicine helps by narrowing the blood vessels thereby relieving migraine headaches. Migraine headaches are thought to result from the dilatation of blood vessels in the head. Rizact 10 Tablet works by constricting (narrowing) these blood vessels thereby relieving the migraine headaches.