antihistamine
noun
an·ti·his·ta·mine
ˌan-tē-ˈhi-stə-ˌmēn 
-mən,
ˌan-tī-
: any of various compounds that counteract histamine in the body and that are used for treating allergic reactions (such as hay fever) and cold symptoms
antihistamine
adjective
Examples of antihistamine in a Sentence
Recent Examples on the Web
Another report suggested that this antihistamine reduced virus levels in nasal tissue.
—
Katia Hetter, CNN Money, 12 Sep. 2025
This antihistamine is commonly used to treat allergy symptoms, including runny nose, watery eyes, and sneezing.
—Tom Gavin, EverydayHealth.com, 11 Sep. 2025
Each antihistamine tablet is formulated with 10 milligrams of cetirizine hydrochloride to help reduce hives and relieve itching due to hives.
—Adam Mills, MSNBC Newsweek, 10 Sep. 2025
Take an oral nonprescription antihistamine (Benadryl) or one with loratadine (Alavert, Claritin, others).
—Jalen Williams, Freep.com, 29 Aug. 2025
See All Example Sentences for antihistamine
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Katia Hetter, CNN Money, 12 Sep. 2025
This antihistamine is commonly used to treat allergy symptoms, including runny nose, watery eyes, and sneezing.
—Tom Gavin, EverydayHealth.com, 11 Sep. 2025
Each antihistamine tablet is formulated with 10 milligrams of cetirizine hydrochloride to help reduce hives and relieve itching due to hives.
—Adam Mills, MSNBC Newsweek, 10 Sep. 2025
Take an oral nonprescription antihistamine (Benadryl) or one with loratadine (Alavert, Claritin, others).
—Jalen Williams, Freep.com, 29 Aug. 2025
See All Example Sentences for antihistamine
Cite this Entry
“Antihistamine.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/antihistamine. Accessed 21 Sep. 2025.
Copy CitationKids Definition
antihistamine
noun
an·ti·his·ta·mine
ˌant-i-ˈhis-tə-ˌmēn
-mən,
ˌan-ˌtī-
: any of various drugs used for treating allergic reactions and cold symptoms
Medical Definition
antihistamine
1 of 2 adjective
an·ti·his·ta·mine
ˌant-i-ˈhis-tə-ˌmēn, ˌan-ˌtī-, -mən
: tending to block or counteract the physiological action of histamine
human blood lacks antihistamine activity
antihistamine
2 of 2 noun
: any of various compounds that oppose the actions of histamine and are used especially for treating allergic reactions (as hay fever), cold symptoms, and motion sickness
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