Ivarest has worked better than anything OTC for me.
My philosophy in regards to POSION IVY. Scratch it till it bleeds then leave it alone awhile then scratch it some more. I mean, come on man, if you can't scratch it, poison ivy wouldn't be any fun at all. Seriously, it will go away by itself in a few days anyway, 5 to 7 at the most. I guess it doesn't bother me as much as most people.