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Table 1 Antihistamines categorized by generation

From: Fexofenadine: review of safety, efficacy and unmet needs in children with allergic rhinitis

First-generation antazoline, chlorphenamine, clemastine, cyproheptadine, dimetindene, diphenhydramine, hydroxyzine, ketotifen, promethazine, triprolidine
Second-generation acrivastine, azelastine, bilastine, cetirizine, desloratadine (metabolite of loratadine), ebastine, emedastine, fexofenadine (metabolite of terfenadine), levocetirizine (enantiomer of cetirizine), loratadine, mizolastine, olopatadine, rupatadine