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.