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Histamine antagonists are medications used to block the action of histamine at histamine receptors. H1 antagonists are mainly taken to reverse the effects of histamine during allergic reactions. Cetirizine hydrochloride and pheniramine maleate are the most clinically used H1 antihistamines; they have common tolerable side effects such as sedation, dizziness, fatigue, dry mouth, and nausea. The effect...
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