That's weird because I am concerned about my son who is diagnosed as ADHD but who I actually suspect has bipolar. He is being medicated - it's only been a couple of months - and I notice he is less hyper, but angry and distractible. I only think this because I have bipolar disorder and maybe he inherited it.
From my experience with bipolar medications they do affect the creative drive. I used to paint and play guitar all the time when I was a kid. When I started medication I slowly lost interest and now do neither. That makes me sad but I have been successful in other things so it balances out I guess.
I expect that if you have ADHD and are treated with bipolar medications you would still have some attention and hyperactivity issues. But I'm not an expert.