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Antihistamines

Antihistamines are first-line pharmacologic agents used to manage allergic rhinitis, urticaria, conjunctivitis, and mild anaphylactic reactions by competitively blocking H1 or H2 histamine receptors. This category covers first-generation agents such as diphenhydramine and second-generation options including cetirizine, loratadine, and fe…

11 articles
Cetirizine
Antihistamines

Cetirizine

Cetirizine relieves sneezing, runny nose, itchy eyes and hives with once‑daily dosing; safe OTC option with common precautions and mild sid…

Nov 6, 2025
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General information only — not medical advice. Always consult a qualified healthcare professional about your own situation.