Honestly, meds haven't affected my creativity at all. I still get plenty of ideas for things I want to do. If anything, I feel more alert, less anxious, and more clearheaded since I started my current cocktail, so it's definitely not my medication. Now my motivation's been in the toilet for some time, but I've been massively depressed for the better part of fifteen months.
That said, just the other day I sat down and churned out a good chunk of finished art, so I'm slowly getting that motivation back. And I've had a decent string of good days lately, despite my situation not having changed appreciably, so maybe this year I'll be able to write that novel I wanted after all.