Hydroxyzine
"I can't believe my doctor did this to me.  I kept talking about how I hated the drowsy feeling that I had all day if I had to take Benadryl at night, because of my eczema induced hives. Three  Benadryl didn't do to me what this stuff did.  I took it last night, because I was starting to get a little itchy and I've been a stinkin' zombie all day!  I have slept my whole Saturday away!  I am so furious that I put the pills into the garbage disposal and will be changing doctors.  Why don't they listen instead of pretending to listen?  Don't take this stuff, definitely don't drive for several days after you've taken it!  I've been taking several Allegra at a time and it's taken away the itching & I've been willing & able to complete daily task"