Claritin-D
allergic rhinitis
"I took this at 7 am to try and fix itchy eyes.  So far, 4 hours later, there is still slight itchiness and wateriness. Worse is the side-effects.  I feel slightly jittery, yet mentally it feels like I've taken a tranquillizer. I don't feel I'm safe to drive. Basically if you are a first time user of the 24 hour version, don't try it on a day you have to use a car."