Adderall prescriptions are perfectly fine if you need them to treat ADHD or narcolepsy, but it is an amphetamine and should be treated soberly as such. Though addiction with proper medical supervision is known to be low, in recreational and non-therapeutic usage, addiction is significant [0]. Amphetamine addiction is known to not be the most pleasant experience. Withdrawal and relapse cycles are also not very pleasant.

I'd not advise lying to your MDs in order to try to get Adderall. If you feel that your job requires you to fake ADHD or narcolepsy in order to do good work, it's time to find another job. Money will not buy your health back, it will not buy years of your life back, and is not worth a chance (small as it is) at an amphetamine addiction.

Honestly, good sleep, exercise, and eating right are the ways to help you get an edge on the competition. Mostly because no one ever does it. Granted, I take a few cups of coffee in the morning to get going too, so I suppose I am a bit of a hypocrite here. :P

It's not rocket science, faking a disease to score amphetamines is a poor decision.

[0] https://en.m.wikipedia.org/wiki/Adderall

https://www.addictions.com/meth/