Meclizine OTC is non-drowsy and works really well for my wife.
I've heard of people mixing Dramamine with a ton of caffeine, but I've been too scared to try it, like I might have a heart attack from all the caffeine. Actually, I heard Kevin Bacon suffers from motion sickness, and that's what he did to get through filming the 0-gravity scenes in Apollo 13. Or something like that.