When you truly clean your body/brain of chemicals, and then use these drugs. (I don't care if it's a lab coat or street thug that sold them to you), you have performance impacts on your brain. These changes last for up to 2 weeks.
Ritalin: An analogue of Cocaine
Adderall:A pharmaceutical methamphetamine
(They give this to 5yr olds in the USA. How F'ed up is that?)
You're cheating yourself out of true productivity. Sorry. Been there, done that, understand the right way now.
I wish you luck.