"i am a 19 year old college student and just got prescribed vyvanse about 2 days ago. when i take it i mainly feel relaxed and sometimes excited. i&#039;ve never been on any stimulant or add medication before. my main concern is losing weight on this medicine. i&#039;m about 5&#039;9&quot; and weigh about 135lbs. i eat a lot and i&#039;m still fairly skinny. i&#039;ve always worried about my weight and the last thing i want is to get skinnier. "