allergic rhinitis
"I used Zyrtec for years, not because I wanted to, but because if you stop taking Zyrtec you itch all over constantly.  You don't just itch for 3 days like you do when ceasing other allergy meds, it doesn't stop ever. I was finally able to kick it by decreasing the quantity very gradually for a few months while also taking Benadryl.  It can be done."