For people who have ADHD it tends to have the opposite effect. I'm not officially dx'd, but in the past...

I'm pretty sure I have ADHD (the test I took which was a standardized test has me on the low end of ADHD)... I've tried some stimulants and it is almost like your brain is so wired, the the drugs over-saturate it and exceeds a threshold and causes a sort of "crash"...

My regular doc has me on Clonidine because "BMI" (they don't want me to Belushi/Farley myself). Clonidine only helps with slowing my brain down, but doesn't help with the focus the way stimulants should (in theory). I'm still as unfocused but just slower, mentally. Which can be good, mind; and it helped my STRESS level during an insane level at work, but not really with focus or motivation issues.

In terms of stimulants I've had in my life:
Caffeine - usual addict (I drink two 240 mg energy drinks, maybe three a day. Wen I was an alcoholic and drinking heavy I would drink 4 cans a day - thankfully I'm no longer drinking and reduced my caffeine)

Ephedrine - as a teen, when it was legal (pre-2000s sudafed ban - when you could buy it in gas stations under the name mini-thins (which I think now are just... shitty caffeine pills last I heard)). I would get all tingly (like weak MDMA physical effects, but no real mental effects) I would crash hard shortly after, just fall asleep, when the drug was still in my system (e.g. most people wouldn't have crashed/fallen asleep)

Methylphenidate (Ritalin)- A coworker whose son had ADHD gave me some back in the early 00s. I tried both a lower and regular dose, both knocked me out. I was hoping for this magical "boost" - and maybe it wasn't the right med, and maybe it wasn't the right dose. IDK, I don't think I'd want that, because my understanding is Adderall is more effective (it's meth, where ritalin is more similar to the cocaine molecular structure - anyone please correct that if wrong it's been ages since I read up on this stuff).

MDMA in the past. This one doesn't knock me out, but it's also extra-serotonin goodness, and the rush is very nice (I bet if I took a lower/micro-dose of MDMA it would be more like Ritalin and Ephedrine) - and this was back in the 90s when MDMA was good - sold by Sammy the Bull Gravano on a mass scale, and you knew it was pretty pure (except the one time someone obviously sold me DXM which is 100% NOT MDMA LOL)

I currently take Venlafaxine, which also helps my focus very very slightly. It reduces my anxiety, which is why I take it, and in the same way Clonidine helps slow me down, so does Venlafaxine. It doesn't help me focus, it just slows me down.

So energy levels it is different for at least some people with ADHD (in fact it's funny - my friend shared a link the other day about this effect saying "if you get tired after stimulants like this, you have adhd" (maybe it didn't say tired, but the gist was the same). Looking up info - it says 2-6% of people may get tired instead (I assumed this was everyone with ADHD, but maybe it's a subset of them, then).

I only WISH I had the chance to be rx'd and TRY the damn stuff. It may not work, but at least give me a chance. I'm overweight yes, but my ticker is good. And I understand with alcoholism my "potential" for abuse is there (but I have no desire for opioids even though I've had them for medication).

The whole thing is rotten, how we manage it, how our society is built, and the demands placed on us (it's gotten worse the past 20 years, every job wants you to be 10 jobs at once). The only way TO be in this society is ADHD multitasking wizard, who can only activate for the bossman under extreme duress, and have no volition on their own, and struggle because of it.