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Patch test for antihistamines including levocetirizine (5% and 10% of Pet.), cetirizine (Zyrtec®, 10% of Pet.), ebastine (Ebastel®, 10% of Pet.), loratadine (Clarityne®, 10% of Pet.), hydroxyzine (10% of Pet.), fexofenadine (10% of Pet.) and loratadine (10% of Pet.) were done. (A), (B) At the sites of cetirizine, levocetizine and hydroxyzine which were piperazine derivatives after 48 h, erythema was presented.
