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 Stuffy nose Decongestants like Sudafed (pseudoephedrine) and Afrin (oxymetazoline) narrow blood vessels in the nasal passages. Colleen Murphy, Health, 5 Apr. 2024 For safety reasons, such products are invariably kept behind-the-counter because of the possibility of pseudoephedrine being used as a starter chemical for methamphetamine production. Joshua Cohen, Forbes, 2 Mar. 2024 The key differences between phenylephrine and pseudoephedrine lie in their efficacy, side effects, and potential for abuse. Kaitlin Sullivan, Health, 23 Sep. 2023 As pseudoephedrine use dropped, phenylephrine's rose. Beth Mole, Ars Technica, 15 Sep. 2023 See all Example Sentences for pseudoephedrine 

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'pseudoephedrine.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1889, in the meaning defined above

Time Traveler
The first known use of pseudoephedrine was in 1889

Dictionary Entries Near pseudoephedrine

Cite this Entry

“Pseudoephedrine.” Dictionary, Merriam-Webster, Accessed 23 Jul. 2024.

Medical Definition


-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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