This question has also been asked and answered here: Adderall vs Vyvanse - What's the difference between them?
From what I understand, Vyvanse is just the new form of Adderall XR. But there are some fairly significant differences between the drugs and how they work. If you google search "vyvanse vs adderall", the link on "healthlifeandstuff.com" sums it up pretty well. (And there are plenty of other results you can read too.)
But it looks like the biggest difference between them is that Vyvanse is supposed to be longer lasting than Adderall. But go to that site... it's very thorough! :)
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