The second‑generation antihistamines segment, featuring agents such as cetirizine, loratadine, fexofenadine, and desloratadine, is defined by selective peripheral H1 antagonism that minimizes central nervous system penetration. This pharmacological refinement yields a non‑sedating profile, positioning the segment as the primary choice for chronic allergic rhinitis, urticaria, and conjunctivitis management. Clinical guidelines and payer formularies increasingly favor these agents, translating into higher pricing power and broader insurance coverage. Consequently, second‑generation antihistamines account for approximately 55 % of the Antihistamine Drugs market size, reflecting both prescription and OTC demand. The segment exhibits a compound annual growth rate (CAGR) of 5‑7 % driven by ongoing product innovation, fixed‑dose combinations, and expansion into emerging economies where awareness of non‑sedating options is rising. This dominant share underscores its strategic importance in market segmentation analyses.