I have wondered about the side effects of zyrtec - our daughter h...

I was on it for 5 years as well. The symptoms sort of creep up so you dont really attribute it to ALLERGY meds!

After I stopped taking it, I noticed that my feelings of general fogginess (I couldnt really concentrate), depression, mood swings and lethargy seemed to magically be gone! I can most def assure you her current state is directly tied to Zyrtec. Take her off of it for a couple weeks and see how she does.

I was 15-20 when I took it, after allegra and claritin failed. I had *severe* allergies, but now that I am 23, they seemed to have lessened. I think they were at their worst during my teen years. When I ran out once, I was miserable for a couple weeks, then my allergies seemed to fade away. I think my body sort of reset itself. Now the odd mold/ cat/ dust overdose will bother me but then I just take Chlor-Trimeton for it and its all better! Hope you figure it out!