L.S.
There is no way I would give it to my kid everyday (no matter what age). Allergies range by day/time of year/etc. I have given my 3 year old zyrtec if I notice his nose is really runny (with clear fluid) and he's sneezing/red eyes. If the zyrtec helps then I know it was allergies and I may give him another dose the next day but usually afterwards he's fine. I have never give it more than 3 days in row. If I were you I would just try a small does when you notice true allergy symptoms and see if it helps. It is supposed to be non-drowsy and it is for my son. But you can give it as an as-needed basis and if a dr. tries to tell you otherwise I would switch doctors! I am married to a family doctor and he would never tell a patient that, allergies just change too much and too frequent to be on some drug 24/7. Just my opinion. Good luck and hopefully you can find a solution. I also second the saline drops, I use those on him about 3-4 times a day (right after he goes potty) and they do help and no drugs, just salt water. But you have to be consistent with them to see benefits too.