In the first place Zyrtec tends to make you drowsy and Allegra tends to perk you up. It would be pretty weird to take them together. I take Zyrtec daily and when my allergies act up I take a single dose of Benadryl which is short-acting. that works well for me.
Zyrtec and Allegra belong to the second generation antihistamines. So, you could continue with either of them. If the present anti histamines are not very effective you can consult your doctor for long acting ones.
i have hives as well and take zyrtec and allegra everyday in the morning.. not had any problems, i hope its not bad long term but my hives act up so i have to take them if i dont wanna itch the **** outta myself all day
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