phenibut (works great for autism and great for adhd), pregabalin (works great for autism and somewhat well for adhd), gabapentin (works very well for autism but can be a bit sedating and aomewhat well for adhd), coke (works very well for autism great for adhd but has a laundry list of side effects), meth (clavmaxxing, works great for autism and great for adhd, laundry list of side effects), nicotine (works well for autism and amazing for adhd but yk compulsive addiction), molly (only once a month tho works amazing for both), shrooms (kinda a permanent awakening but only MAY work), weed (amazing for autism and some strains r good for adhd)
so empathogens are amazing the best for autism and somewhat for adhd (but many cannot be used often), many psychedelics can cause what is basically “permanent awakening” for autism (and shrooms can be used relatively often like once every 10 days) but only MAY work long term, stims r very good for both but have a laundry list of side effects and a heavy addiction risk, nic is a lifetime addiction but is one of the “safer” out of what ive mentioned, gabaergics will work very well but some risks, weed is probably best overall but only some will work for adhd and it will only work for adhd for some great for tism tho

BIG DO UR OWN RESEARCH
it depends on how ur nd like
itdepends on what ur main weaknesses are
this is js as far as drugs tho