"my experience was probably the worst i&#039;ve had so far. i lost 20 lbs with 40mg of vyvanse. i was a healthy 145 lbs, i am now 120lbs. i had horrible diarrhea, its was so bad. i was extremely faint and dizzy. i could go without sleeping and eating for almost days. i had terrible heart fluttering feelings. however it did work great for my adhd and also for my depression and anxiety. but, of course, i struggled with malnutrition and have been struggling so much (still) with gaining the weight back. i then had taken 30mg, but then it was not enough. finding the right medication is such a struggle.."