allergic rhinitis
"Sneezing, itchy eyes and runny nose, terrible allergy attack.  Normally I take benadryl or one with dyphenhydramine in it but I didn't want to be tired all day so I took Claritin-D 12 hour.  BIG MISTAKE!  It took 5 hours before it even started easing my allergy symptoms and it still hasn't completely gotten rid of them but I am stuck not being able to take anything else for another 6 1/2 hours.  I would never recommend this!"