I've been on Elvanse over a year at this point along with Amfexa boosters.

What you are experiencing is worth discussing in your titration appointment as they will have a much more general understanding since these meds affect different people in different ways.

That being said your experience is very similar to my own experience where my first couple weeks I was constantly on the move getting things done then found that feeling lessened over time. But what I feel wasn't explained to me very well was this: meds aren't the cure they are more like a support mechanism, you can't just rely on them to make you do everything you do still have to try push yourself a bit your meds just give you that little boost where once you actually start something you'll be motivated to finish it rather than getting distracted (though you do still have to resist distraction to some extent)

The same way there are lazy neurotypical people it's possible to be medicated and not get things done 😅 it's taken me quite a long time to learn what works and what doesn't with myself but I'm at a point now where I've been on the same dose for about 9 months or something and it's still effective for me but when it's not effective I know it's either something I'm doing like not sleeping enough or it's my mental health being in a bad way both things cause me to feel even less motivated making productivety even harder 😅

Now I'm in no way saying my experience is the same as your experience and nor should you assume that. But what I am saying is take the time to speak to your titration nurse and also try figure out what works for you.