"ok i&#039;ve been on v for 3 years now cuz i&#039;ve tried all the other amphetamine based &quot;adderall, adderallxr,etc. vyvanse seemed to address my adhd issues but its almost a year since i&#039;ve lost my appetite and most days i&#039;ll have a kind bar in the morning but i take my v. it can be 8am or 11am and still haven&#039;t been able to eat. it feels like u have the flu and nothing seems appetizing, i take a multivitamin, b12 complex, as well as iron. i have lost weight but after a year with not eating consistently but i am tired all day, crabby, my teeth hurt too "