allergic rhinitis
"I have used anything from chlorpheniramine to claritin to zyrtec and then telfast by far telfast is the only one that didn't make me overly drowsy.

Just this morning I woke up feeling miserable stuck nose and sneezing like over 10 times and heavy headed. I popped a pill and went to work and within an hour I was almost good as new. Throughout the day I was very productive and not once dozy. With my nose not running a bit, I even had the energy to run a 10km in the evening myself!!!"