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
From what I understand, effectiveness is not guaranteed for any of the currently available meds. I won't disclose which one at this time, as I don't think it would be helpful to do so. I can only relay from my assessor, who explained to me that if a med is working, you will definitely notice the difference.
If you experience a problem with medication (like: it seems to you to not be working) you'll have to take it to your doctor irregardless. Maybe you can make your case and get a different dose or a different substance. Maybe you need to get a second opinion from another doctor. Maybe you need to switch doctors altogether. That last option can be a hard decision to make, but that is one that online people can actually help - if you provide some context information. If you don't want to do that and just read up on other people's experiences, I suggest you go over to c/ADHD, because they are around a little longer and you'll have a bigger chance of finding answers there.
Thanks for the well-written reply. You've already mentioned something that I've been thinking for awhile now: I need a different doctor. My GF wants me to stay but I've already been through this before with the last doc I've had: they don't listen and make me feel like my problems are insignificant. I keep telling them that these meds don't work, but they keep reassuring me that I have to continue dosing for months at a time before I finally feel something.
Also thanks for the community reccomendation. I've been looking for a good replacement for /r/ADHDmeme ever since I left reddit.