This one speaks to me on multiple levels.
It's a reason I dropped my scepticism of medication and went to get a diagnosis and subsequent prescription. I am glad I did - and that it worked first try. (It's not guaranteed anything would, depending on unknown factors and probably autism also influences the effectiveness)
I can confirm: At first, it really feels that way. But now, half a year later, it balanced out a little and I am only medium fast. Still - much improvement compared to before.
(Disclaimer: This is not medical advice, do not mistake for such)
edit: Artist, I believe, is Toivo Kaartinen, creator of Foxes in love
Oh, you're right. This one only has a signature. I don't know for sure, but I'll edit it in.