I take flonase and allergra for seasonal allergies, and that usually controls it. today it is not. can i take allegra, claritin, or benadryl?

Allergy treatment: If taking Allegra already you should not double up on a long acting antihistamine (Allegra, Claritin, Zyrtec). This can cause heart issues. Intra-nasal steroids (Flonase) should be used routinely. Adding Allegra is fine on an-needed basis. Adding short acting (Benadryl) is ok but indicates need for better preventive care (environmental controls, more consistent Flonase use, allergy shots).