adhd
"Wonderful drug. I have been on it for over six months and it has remained consistent. I used to be on Concerta, which was ok, but I felt as if it lost its potency. Vyvanse allows me to focus and maintain concentration. It also gives me a boost of energy. At times when I have missed a dose and left the house for the day I have felt tired and disinterested in the activities I was involved in. I have no side effects from it but I rarely have side effects to any drug. I have read that you are not supposed to have vitamin C while on it because it can interfere with the drug's ability to metabolize in one's system. I avoid vitamin C during the day and take some at night. Take it around 8 or 9 so you can sleep at night."