Whatever keeps one from dying directly helps creativity as well as anything else.
I wonder if neuroscientists really know how to detect what creativity even is in the brain scans they take, but having such tools, which didn't exist 40 years ago, does give them a chance to look at the effects of drug use or other activity in a new way.
Adderall according to Wikipedia supposedly has the
Side effects of amphetamine salts include dry mouth, insomnia, tired feeling, drowsiness, dizziness, nervousness, headache and weight loss, diarrhea, as well as faster heartbeat combined with lower blood pressure. Hair loss (alopecia), decreased libido, and bloody stools have also been reported.
In the long run, I wonder if it changes the brain so it is more creative or not.