Both, though in some ways my fog has gotten worse and I believe this is from long covid and changing other medications. So it's hard for me to really judge that for now.
I started meds after I had COVID and was already experiencing long term symptoms (brain fog but also fatigue). So I do feel less foggy after starting meds but I also still have more memory problems than I used to pre-COVID. I also have had increased brain fog lately because I'm tapering off a different need and have had brutal withdrawal from it. I just don't think I can tease apart what's coming from where.
40s here and tried so many different things. Got on vyvanse a few weeks ago, and the best way I can describe it is I feel normal. My fear is it will stop working one day