>>1158228620 mg daily here, sometimes 30-40 if particularly jittery.
As a kid I was usually labeled as an underachiever, always got into trouble for talking too much or acting out in class. Everything was boring, couldn't concentrate for more than a few seconds.
Looked through a file cabinet and found a paper diagnosing me with significant ADHD as a young kid and confronted my parents about it. The 90s' was full of diagnoses and they didn't believe in it.
Got my mom to give me an RX just to try. It was an immediate, life changing difference. It slows my thoughts and actions down to the point where I feel that I am in control.
When off them for too long, I feel as if my brain is whizzing and whirring into 4 different compartments/trains of thought.
For example, if I want to write out a sentence off meds, I'll deconstruct the sentence into 4 various combinations of words, and often times they'll jumble into each other and the resulting outburst makes little to no sense at all.
On meds, I can capture each word I want to speak and link them together.
All in all, I definitely feel 'normal' on meds and far more eloquent in conversations. My coworkers notice it as well.
Euphoria wise? It's more a physical euphoria when you take a higher dose than usual after having taken a long break. Feels great, but not much better than having a great day or hearing good news - consistently for a few (2 or 2 and a half?) hours?