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Table 3 Classes of medications filled a by patients with CIU/CSU CIU/CSU chronic idiopathic or spontaneous urticarial, NA not applicable a Claims data report only prescription fills, not actual medication use b The database did not include non-prescription antihistamines c Non-sedating H 1 -antihistamines included cetirizine HCl, desloratidine, fexofenadine HCl, levocetirizine dihydrochloride, and loratidine; sedating H 1 -antihistamines included brompheniramine, carbinoxamine, chlorpheniramine, clemastine, cyproheptadine, dexbrompheniramine, dexchlorpheniramine, diphenhydramine, doxylamine, pheniramine, promethazine, pyrilamine, tripelennamine, triprolidine d Cimetidine, ranitidine, famotidine, nizatidine e Montelukast, zafirlukast, zileuton f Parenteral medications do not report “days of supply” on claims, therefore the mean number of doses is reported here CIU/CSU patients had a mean of 15.1 all-cause office visits annually, 465 (7.3 %) were hospitalized at least once for any reason, and 1012 (15.9 %) had at least one ED visit (Table 4 ).