Methylphenidate
"I'm 50. I was in school before ADD and ADHD were a thing. Those of us that couldn't pay attention or behave got C's and D's, and we liked it that way. I'm kidding, we didn't like it that way and neither did our parents. I muddled through high school and even got a college degree, but I really struggled. I remember when I first heard of ADD and meds that treat it, and it was a revelation. I've tried many of these medications and Concerta is my favorite. To me, it's the smoothest.  The short acting drugs hit too strongly and then quickly crash. Hard. I had been taking Metidate CD until an insurance change made Concerta cheaper. Concerta is smoother than Metidate."