vasoconstrictor

noun

va·so·con·stric·tor | \ ˌvā-zō-kən-ˈstrik-tər

Definition of vasoconstrictor

: an agent (such as a sympathetic nerve fiber or a drug) that induces or initiates vasoconstriction

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Did You Know?

Our blood vessels are constantly narrowing and widening in response to our activity or our environment, constricting in order to retain body heat and widening to get rid of excess heat. So when we're hot our skin flushes, and when we're very cold we become pale. Since the width of the blood vessels affects blood pressure, vasoconstrictors are prescribed to treat low blood pressure. Vasoconstrictors include antihistamines and amphetamines, as well as nicotine and caffeine; we commonly buy them for our runny noses and bloodshot eyes as well. The opposite of vasoconstrictors are vasodilators, which are commonly used to treat high blood pressure.

Examples of vasoconstrictor in a Sentence

Recent Examples on the Web

The first such drugs, called ergotamines, were powerful vasoconstrictors derived from the ergot fungus, which grows on rye and other grains and led to mass poisonings in the Middle Ages. — Emily Underwood, Science | AAAS, "Will antibodies finally put an end to migraines?," 18 May 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'vasoconstrictor.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.