Hydroxyzine
"Just started this. It sure does knock the itch out BUT. Whew. I took it at 11 AM and crashed at 2PM. 

I'm sure, like most things, after a week or so the drowsy thing goes away. Gravol(Dimenhydrinate) used to do the same thing to me. Now it has zero drowsy effect on me. It's great for the guts but not near as good as Hydroxyzine for itching. "