"last year my oldest daughter who is now 9yrs old was diagnosed with add and the doctor put her on aderrall but within a week took her off and right away put her on vyvanse 30mg. it worked perfect for a while but now have to get her dosage raised because it wears off after only a few hours although the upside is that her grades have improved tremendously and now i also have an 8 yr old who was also diagnosed with adhd and is also taking vyvanse 30 mg and i&#039;ve noticed a real positive change in her concentration and her mood. i love it because she is also doing so much better in school."