I'll give my own anecdotal evidence and let folks do what they will with it. I will say I attempted to get back onto ADHD medicine as an adult and didn't like it, so I slough through life without it. Anyway.
I am adopted. My records indicate that my father was 6'1 or so, and my mother was 5'10, if I remember correctly. I was always the tallest kid in class when I was younger. My mom was a former teacher, she knew I was ADHD, but docs wouldn't prescribe me Ritalin because I made straight A's in elementary school. Finally my mom found a psychiatrist was like "Yeah, this kid is classic ADHD" and prescribed Ritalin to me when I was in the 5th grade. At the time, I was 5'10", and doctors had projected my growth in the 6'7" or 6'8" range. I took Ritalin through HS, and from 5th grade to puberty, I only grew 5 inches, and I'm now a hair shy of 6'3".
Now, that worked out for me, because man, 6'7" would not have been super cool, but 6'3" works out just fine, assuming Ritalin did stunt my growth. Not sure if my genes are of the 6'7" variety or not, but also anecdotally, my wife is 5'3" and our son is also generally the biggest kid in his grade thus far. He's 7, most folks assume he's like 9-10. We'll see how tall he ends up considering he's got his mom's 5'3" weighing him down. If he also ends up around my height, well, maybe I did have those 6'7" genes after all.