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Nitrates are one of a type of drug known as vasodilators, that are used to treat angina in people with coronary artery disease or chest pain caused by blocked blood vessels of the heart. They work to control angina by relaxing the coronary arteries so blood can flow more easily to the heart.
Nitrate Allergy Symptoms. Nitrate is the chemical compound found in various foods. It is used as a preservative for foods. Nitrate allergy symptoms are found in some people by eating processed foods. The people who are sensitive to this chemical might suffer serious headaches to migraines due to nitrate allergy.