Appropriate choices include Cetirizine 10 mg once / day Fexofenadine 180 mg once / day Desloratadine 5 mg once / day Levocetirizine 5 mg once / day Older oral antihistamines (eg, hydroxyzine 10 to 25 mg every 4 to 6 hours; diphenhydramine 25 to 50 mg every 6 hours) are sedating but inexpensive and sometimes quite effective.