Is it safe to take both Allegra-
D and
Zyrtec. In short, I suffer from allergies. I find that I feel best when I take a single pill of Allegra-D in the morning and a single pill of Zyrtec at night. In part, I have been doing this because I haven't had to go to the doctor (or Canada) to get more Allegra D so I can take it twice a day. I was wondering what the possible side-effects, besides fatigue, are of the regimen I'm taking? I've felt much better since beginning it.