I've not been dx'ed with ADHD ( a while ago my Dr asked me if had certain symptoms indicating ADHD, I said no, but those symptoms would've applied to the younger me for sure) but all the same, stimulants like meth and Ritalin, completely relax me. No racing around cleaning the house all of a sudden or anything. I could watch TV, even the ads, and not get annoyed(!) So - I kinda fit the paradoxical thing I think.