Final answer:
A patient diagnosed with Prinzmetal's angina should avoid Ergotamine as a medication for the treatment of migraine headache.
Step-by-step explanation:
A patient diagnosed with Prinzmetal's angina would need to avoid Ergotamine as a medication for the treatment of migraine headache.
Prinzmetal's angina is a type of chest pain caused by coronary artery spasms, and ergotamine can cause vasoconstriction, which can worsen the spasms and lead to further complications.
Other medications like Sumatriptan (a triptan), Propranolol (a beta-blocker), and Acetaminophen (a pain reliever) would typically be considered safer options for patients with Prinzmetal's angina.