Your dose might be too high. Stimulant crashes wipe you out. Part of your day needs to be spent recovering from stimulants. This means spending part of your day off stimulants. Bigger dose = Bigger Crash.
Also, staying hydrated is important. When us ADD folks hit a sweetspot in our productivity we forget to eat and drink the way we should which can negatively impact the medications effectiveness.
I am 41.
Been on vyvanse for 4+ years
My dosage has been as high as 70mg morning/50mg afternoon
Also, you don’t want the dose too high. There may be times you lose your medication or can’t get a prescription filled and will need to spend a month without medication.