How Long To Take Allergy Medicine To Know If Its Working?

I’ve had really bad allergies for a few days now and have tried zyrtec, claritin and benadryl, but only one time each. Didnt make a bit of difference. Will it help if I try one for a few days or should it work before its time to take the next dose? Thanks.

How Long Does Allergy Medication Take To Start Working, And How Long Does It Last?

If I take a generic, one-a-day allergy medicine, how long will it be before it starts working? How long until peak effectiveness, and after how many hours will the effect wear off.