yes i take 10-20mg, used to take more, but that changed when i got the bp dx.
i now also take lithium, welbutrin small dose, clonopin if needed.

it does help focus, for sure. but decided with pdoc yesterday to not take it when i've not slept and manic, because it caused big anxiety while trying to work. it doesn't work if you are sleep deprived, sick, or very stressed out. (for me and according to pdoc)