<this is in response to Laurenbean. For some reason my reply function didn’t work>

I used to do that dosing regimen. I’d take 200mg in the AM and 200mg at noon. Seemed to cover the day reasonably well.

That being said, if it’s not doing it for you you might want to try one of the other stimulants. Adderall is pretty decent, though you have to dose the IR version multiple times a day. I take Vyvanse which I like, but since all long-acting stimulants don’t last all day for me, I also dose that in the AM and at noon.

Best of luck in your search.