I steer clear of anything that has a decongestant in it...ie sudafed. It causes my palpations to get worse. I usually just suffer through with mucinex and use a vaporizer at night.
My doc said to use zyrtec for a cold if you have afib, which I do. Most antihistamines will up your blood pressure causing worse fib action. Have you ever had shock treatment? I'm thinking about it. Goodmac
I think most are usable as long as they do not contain aspirin. There has been discussion here that some may stimulate palpitations. I suffer from permanent AFib, but don't detect any increase in intensity form use of over-the-counter cold/allergy medication.
I buy Walmar "Equate" lower cost if I can. Examples are equates for Benadryl and Sudifed (Spelling?).