Desloratadine
"For several years I had been using a corticosteroid nasal spray to control my seasonal allergies, the spray worked great but I would wake up every morning with a very dry nose and occasional bleeding. My allergist said the spray should only be used for breakthrough allergies and that I should be taking an OTC antihistamine every day during allergy season. His recommendation was cetirizine but it made me so sleepy that I could barely function for the 24hrs it was in my system. I then tried loratadine but experienced the same thing. I moved onto desloratadine but was skeptical since it's the activated form of loratadine that it would also make me drowsy. Surprisingly it doesn't!"