Dex/vyvanse and meth similar high?

As a person who’s never done any form of uppers In there life I was wondering if those amphetamine adhd meds have a similar effect to meth as I’ve known a couple people who started out abusing there medication until they found the Tina, no I don’t plan on taking any (maybe a 50mg vyvanse one day) Just curious because I can’t even handle my caffeine n wanna know why they give uppers to people with adhd