"5th month on vyvanse 30 mg which is on the lower dose end. this med has an awful crash. i exercise 4-6x a week. i eat very healthy. i stay busy. i read so many reviews about the same issue. i did reading about the &quot;minimal&quot; crash felt on this med and it is so scary how pharmaceutical companies try to set the med apart. 
for me it lasts 6 hrs and irritability increases. i think it&#039;s in-part tolerance. mid afternoon, i get severely irritable, anxious, moody, sleepy, and agitated. it is so uncomfortable, i&#039;m supposed to &quot;up&quot; my dose now...to see it last longer and my &quot;crash&quot; will start later&quot;? "