A vasoconstrictor is a substance or medication that narrows blood vessels, which increases blood pressure and reduces blood flow to certain areas of the body. This can be useful in managing conditions such as nasal congestion, migraines or hypotension. Synonyms for vasoconstrictors include vasoconstrictive agents, constricting drugs, and vasoconstrictive substances. Other terms for these substances include pressor agents, which describes the ability of these substances to raise blood pressure, and antihypotensives or vasopressors, which refer to their ability to maintain blood pressure in patients with low blood pressure. Common examples of vasoconstrictors include epinephrine, phenylephrine, and norepinephrine.