Rescue Medications are those taken if abortive medications fail or if we can't take the abortive medications. Most rescue medications are pain medications. Other types of medications are also used to help get through a Migraine by reducing nausea and helping Migraineurs relax. They don't have the ability to abort a Migraine, but will hopefully mask the pain for a few hours while the Migraine runs its course.
You can read more about rescue medications in: