That would be modafinil. It’s prescribed for sleep apnea and also given to fighter pilots (which is how I have used it).
It’s pretty fricking amazing, but you get strung out after a couple of days.
Makes you quick, mean, emotionless, and a very effective killing machine.
Seems to work like aderall another methamphetamine
I took it once and it made me very sociable, I even did not need to speak to people, there was like a glow that made people come to you. I could not shut up either. After it I had a hard time concentrating for about a week, a problem I never had before.
Hence ADHD is caused more by the drug than anything else, just like when prozak turned melancholy into outright depression