Other secondary outcomes include rates of sustained headache relief (moderate or severe pain becoming and maintaining a level of mild or none), two-hour NRS change (NRSbaseline-NRS2hours), 24 hour NRS change (NRSbaseline-NRS24hours), need for rescue medication before two hours, need for analgesic medication after discharge from the ED, associated symptoms (specifically: weakness, drowsiness, dizziness), unscheduled visits to a medical provider within 24 hours of medication administration, and the percentage of patients who answer affirmatively to the question "Do you want to receive the same medication the next time you come to the ED?"