I'm a male in my mid 50's. I started Zyrtec and Nasacort on the recommendation of my MD to deal with itchy, red eyes and other general allergy. Most other meds hadn't worked. These did and stopped the symptoms cold. However, I started noticing that I'd pretty much lost any desire to exercise and that I felt very lethargic in the mornings. I decided to drop the Zyrtec. The first day off, I had a mild case of hives. The second and third day I've had itching. I figured it had to something to do with Zyrtec so I started searching the internet and found this site. I don't plan on going back on Zyrtec unless I have a serious allergy flare-up. Even then, I may consider shots instead of meds.