diphenhydramine

From diphen(yl) +‎ (benz)hydr(yl) +‎ -amine.

• (Received Pronunciation) IPA^(key): /ˌdʌɪ.fɛnˈhʌɪ.dɹəm.iːn/
• (General American) IPA^(key): /ˌdaɪˌfɛnˈhaɪ.dɹəˌmiːn/

• Audio (General American):

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diphenhydramine (countable and uncountable, plural diphenhydramines)

1. (pharmacology) An antihistamine and anticholinergic drug that blocks the effect of histamine at H₁ receptor sites, relieving allergy symptoms. It also reduces smooth muscle contraction, increases heart rate, and sedates the user by blocking muscarinic acetylcholine receptors (mAChRs).

   Synonyms: (brand name) ZzzQuil, (brand name) Benadryl

   Diphenhydramine is a convenient and cheap antihistamine for use, but there are other drugs that do not make the user tired.

• “diphenhydramine”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.
• “diphenhydramine”, in Merriam-Webster Online Dictionary, Springfield, Mass.: Merriam-Webster, 1996–present.