My experience (amphetamine sulphate) is this:
Amphetamine (adderall) is initially a mood enhancer, generally leaning more towards the positive. If your mood is neutral or positive, you could end up feeling really good. But if your mood is negative or low, it could maybe make you feel good, bust quite likely will make you feel significantly worse. And every possible combination in between, but mostly it follows this pattern.
However, the negative side effects of amphetamine are quite acutely accumulative. When I first used amphetamine (2003) I couldn't imagine getting anxiety or a comedown. I used it sporadically (never staying for up for more than a night and never more than 1 days use in a row), and everything remained the same. I also experienced no anxiety and depression in day to day life.
I re-acquainted myself with amphetamine in the spring of last year, and I'd say I've bought it on 5-6 occasions since. I had already developed depression/anxiety prior to using all it on this occasion, whereas I had none in my earlier usage. I never missed more than one nights sleep, but I did use it for sometimes consecutive days on end, somewhat sporadically, and usually for 1-3 weeks until I ran out. I would build tolerance and in the times of the most heavy usage, feel shit for about a month (anxiety, depression, fatigue). I would also often feel depression and/or generally extremely anxious upon using it.
This all happened cumulatively, so it got worse each time. These days I find that the first day I use amphetamine, if I'm in a good mood, I will probably feel great, but might experience anxiety. Day two, I'll probably feel okay, and experience quite bad anxiety. Day three, I'm wondering what the fuck I'm taking it for given I feel that bad, but I usually start feeling so fatigued I feel I need it to keep me awake. It gets worse until I run out and feel like absolute fatigued crap for 1-4 weeks.
If amphetamine noticeably improves your mood, you will probably continue using it for that purpose until something causes you stop. It will most likely be pretty much the same thing that happened to me, but at a different rate depending on your usage and how often you re-dose. If you stay up for days on end (or are simply pre-disposed), then psychosis might also be a factor.
Ultimately this will serve to be counter-intuitive to any persons battle with depression, and will add a whole host of other issues to the mix.
Can amphetamine remedy depression? Yes. Will it probably make things worse, eventually? Likely so.