Allegra (fexofenadine), Claritin (loratadine), Zyrtec(cetirizine), Xyzal(levocetirizine).
Atarax (hydroxyzine), Benadryl (diphenhydramine), nasal sprays such as azelastine (Dymista, Patanase) have shorter half-life and may be stopped for as little as 3 days prior to testing.