The Antihistamine Drugs Market focuses on medications used to treat allergic conditions, such as allergic rhinitis, conjunctivitis, and urticaria, by blocking the action of histamine at the $\text{H}_1$ receptors. The continuous rise in the global prevalence of allergies, exacerbated by environmental factors and pollution, is a key driver for sustained demand.

coupled with their wide availability as over-the-counter (OTC) medications, is ensuring convenience and improved patient compliance, thereby dominating the commercial landscape of the Antihistamine Drugs Market.

The market is fundamentally segmented by generations of drugs, defined primarily by their ability to cross the blood-brain barrier. First-Generation Antihistamines (e.g., Diphenhydramine) are effective but often cause sedation, limiting daytime use. Second- and Third-Generation Antihistamines (e.g., Loratadine, Cetirizine, Fexofenadine, and their active metabolites) are designed to be peripheral $\text{H}_1$ receptor selective, minimizing sedative and other central nervous system effects. This shift toward the safer, longer-lasting, and non-sedating second and third generations,

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