allergies
"After taking Xyzal for only 3 weeks, my quality of life has vastly improved.  The first 2 days I felt a little sleepy.  The only symptom I still have is a runny nose in the morning, but it goes away after several hours.  I took Zyrtec D for over a decade while living in Los Angeles and my allergy symptoms were controlled, but some days I could barely speak because my mouth and throat were simply too dry.  After moving to Arizona, Zyrtec D was failing to control my allergy symptoms and I was dry everywhere.  My skin itched, my eyes and ears itched and hurt.  I tried both Claritin D and Allegra D which provided little to no relief."