If the patient is currently taking a medicine that reacts to a certain treatment, it can lead to bad side effects. If you didn't have that medicine in their info, you could unknowingly treat them with something bad.
The nurse should prioritize assessing the severity of the migraine or headache that the patient is feeling. He/she can do this by asking the patient through a Perceived Stress Scale of 1-10, with 10 being the most painful form of headache, and 1 at the lowest rate of pain. Sumatriptan is a drug that is actually used to treat or manage migraines and other cluster headaches. It can be drank orally, nasally sprayed, and injected subcutaneously.