It’s not literally meth, but it is an amphetamine (in fact, literally amphetamine, it’s one of the two enantiomers of amphetamine, and the more potent of the two at that)

So same class of drugs, produces the same kind of effects to different degrees. You can kind of think of it in the same way that opium, morphine, heroin, and fentanyl are all in the same family of drugs, fentanyl is of course way more potent than opium, but at its core is still doing essentially the same thing.

And for what it’s worth, meth is also an ADHD medication, sold under the brand name Desoxyn, not super commonly prescribed but it is used for that purpose.

And since I’ve already touched on this concept- meth also exists in 2 enantiomers, Desoxyn and the street drug are dextro-methamphetamine, and levo-methamphetamine is sold over-the-counter in some places to treat stuffy noses as a “Vicks Vapor Inhaler.” Chiral chemicals like that can be weird, sometimes they can be almost entirely interchangeable, other times they can have completely different effects or mildly different potencies.