https://en.wikipedia.org/wiki/Substituted_amphetamine
The most famous in that family seems to be meth(amphetamine)
> Chronic Meth users have deficits in memory and executive functioning as well as higher rates of anxiety, depression, and most notably psychosis. [0]
In more recent times of horror:
> After the fall of the al-Assad regime in Syria, large stockpiles of the illicit drug captagon have reportedly been uncovered.
> The stockpiles, found by Syrian rebels, are believed to be linked to al-Assad military headquarters, implicating the fallen regime in the drug’s manufacture and distribution. [1]
[0] https://pmc.ncbi.nlm.nih.gov/articles/PMC3764482/
[1] https://theconversation.com/what-is-the-drug-captagon-and-ho...
https://www.cbc.ca/news2/background/friendlyfire/gopills.htm...
That being said if anyone uses drugs to avoid sleeping for many days straight I would imagine it's quite horrible for your mental health
I tried googling for more info but I haven't been able to find much in English and my Japanese isn't good enough to read at that level. I've only heard about it from my wife and a few other people in Japan. I've seen a few old posters for it at old bars.
But I'm not a doctor either so who knows really.
I wouldn't recommend them in general, but mostly because they last too long to really work with a normal 16/8 sleep cycle and the other stimmy effects can detract from things other than focus work.
It's a huuuuuge family of substances though, particularly if you go one step more generic and start with Phenylethylamine as the backbone (amphetamine is a shortening of alpha-methyl-phenethylamine), the family includes hallucinogens like mescaline, empathogens like MDMA and its close cousins, the whole 2C family, the cathinones and their derivatives ('mephedrone' had a cultural moment 10-15 years back). And some real nasties like PMA, PMMA and bromo-Dragonfly.
As I understand it, the aspartate and saccharate still dissociate in solution. If so, there isn't much of a plausible reason to consider them different drugs. If not, they might act more slowly or not at all.
None of this puts Adderall in the class of substituted amphetamines like MDMA or Desoxyn or exotics like ALEPH: https://www.erowid.org/library/books_online/pihkal/pihkal003...