Once you have a prescription, you can fill it at most major retail pharmacies or licensed online providers.
Nitroglycerin (oral route, sublingual route) - Side effects & dosage
Nitroglycerin tablets are a prescription-only medication used to treat and prevent chest pain (angina). Because they are not available over-the-counter, you must first obtain a valid prescription from a licensed healthcare provider, such as a cardiologist or primary care physician. Where to Buy Nitroglycerin Tablets