What does it mean if you get a headache after taking nitroglycerin?
- What does it mean if you get a headache after taking nitroglycerin?
Nitroglycerin works in the heart arteries by opening up those arteries and allowing more blood to flow through. That's how it can be useful to relieve chest pain. As a side effect, though, that same sort of opening up of blood vessels can occur in the head and the brain, and this is what can lead to a headache.