I take Ritalin myself, and have no personal experience with Vyvanse. This is one of the newer meds for ADHD, so there aren't a lot of threads on it. But I was able to do a search on this board, and came up with a couple of threads for you to read: 10 year old and Vyvanse
10 year old and Vyvanse how long does vyvanse stay in system
how long does vyvanse stay in system
Perhaps othters will chime in here with their experiences.