allergic rhinitis
"I just took Zyrtec for the first time last night. I slept great, but now that I am awake, I feel so tired. I am not experiencing any of my allergy symptoms, but I am on Nasonex too. Nasonex and Zyrtec work great together, the Zyrtec is the antihistamine, and the Nasonex is just a generic allergy medication. I am very sluggish, but people have said that it wears off within a couple of days. I am a little drawn back though, people have been saying it causes problems with their moods, but I trust my doctor who prescribed it to me. Hope you all feel better soon."