The other product that works for me is something called "Hairever II". It is a hair tonic, and not sold as a dandruff remedy.
It's a bit of a pain to apply, as it comes in a spray bottle which is pretty useless for getting it on your scalp unless you are bald. I got one of those applicators ("Roots Only") meant for applying hair dye I think. Previous to that I would pour a little out, dip my finger tips in it and massage it into my scalp that way.
Anyway, I find this stuff offers some relief if I'm between shampoos and my scalp is a little itchy. I've probably not really explored its full potential because, as I've said, its a bit of a pain to apply so I don't really use it very often.