diphenhydramine
0 synonyms and 0 antonyms for diphenhydramine, grouped by meaning and by how common each one is.
Noun — 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).
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