I take Dexadrine for ADD and it also helps a little with my BP II depression, mostly because it focuses my mind which helps keep depressive thoughts from creeping in as much during the day.

I'm not sure about Adderall, but I know Dexedrine is just fine for long-term use, as I was on it through most of my teens without any problems other than needing to slowly increase the dose because of building up resistance.