I have never heard my Psychiatrist talking about it being used to treat Bipolar.
The only reason I take
Adderall is to treat my ADHD. I have also only taken
Adderall and nothing else, for a period of time, and did not notice any changes in my Bipolar symptoms. Everyone is different though, but a symptom one can have from taking Adderall, are racing thoughts, so I don't believe it would be prescribed to treat that.