Fexofenadine (Allegra® 180) is a second-generation antihistamine. It is widely used as anti-allergic drug, which suppresses various allergic reactions mediated by histamines. A few cases of H1-antihistamine-induced urticaria have been reported. Herein, we report a rare case of fexofenadine-induced urticaria which was confirmed by a prick test, oral provocation test, and flow cytometry assisted-basophil activation test.
Keywords: Basophil degranulation test; Drug eruotion/etiology; Fexofenadine; Histamine H1 antagonist/adverse effects.