I am Bipolar 1 and on lithium and other meds. I take Vyvanse for ADHD and it works well.
It seems to be "smoother" for me than the other ADHD meds.
It also did not make me manic or hypomanic (except for when I forgot to take my mood stabilizing meds).

Vyvanse is great for focus and energy.
Joy is hard when you are depressed, but it does allow me to function.

If you take it with protein in the morning, it is supposed to act better. I have taken it without eating and do fine as well. I take 70 mg.