pseudoephedrine

noun

pseu·​do·​ephed·​rine ˌsü-dō-i-ˈfed-rən How to pronounce pseudoephedrine (audio)
 British also  -ˈe-fə-drən
: an isomer of ephedrine used in the form of its hydrochloride or sulfate especially to relieve nasal congestion

Examples of pseudoephedrine in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Decongestants and antihistamines For adults with stuffy noses, the only decongestant to bother with is pseudoephedrine, the active ingredient in regular Sudafed. Keren Landman, Vox, 7 Dec. 2018 Restrictions on access to pseudoephedrine were adopted in Australia at around the same time. New Atlas, 23 Dec. 2024 Oral decongestants: Choose options such as Sudafed (pseudoephedrine). Daniel More, Verywell Health, 15 Jan. 2025 It was marketed as an oral decongestant as effective as pseudoephedrine. New Atlas, 23 Dec. 2024 See All Example Sentences for pseudoephedrine

Word History

First Known Use

1889, in the meaning defined above

Time Traveler
The first known use of pseudoephedrine was in 1889

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Cite this Entry

“Pseudoephedrine.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/pseudoephedrine. Accessed 3 Mar. 2025.

Medical Definition

pseudoephedrine

noun
pseu·​do·​ephed·​rine
-i-ˈfed-rən, British also -ˈef-ə-drən
: a crystalline alkaloid C10H15NO that is isomeric with ephedrine and is administered chiefly in the form of its hydrochloride C10H15NO·HCl or sulfate (C10H15NO)2·H2SO4 especially to relieve nasal congestion
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