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Vasodilators increase the size of blood vessels.
Nylidrin is used to treat problems due to poor blood circulation. In deciding to use a medicine, the risks of taking the medicine must be weighed against the good it will do. This is a decision you and your doctor will make. Tell your doctor if you have ever had any unusual or allergic reaction to nylidrin. Also tell your health care professional if you are allergic to any other substances, such as foods, preservatives, or dyes.