My mom said that I've been on Vyvanse for years now. So really, if you're experiencing any symptoms, it's either because 1. You're allergic to it or 2. You've just begun taking it and your body is still getting used to taking it. Vyvanse helps me with my ADHD and when I don't take it, I seem a little high happy(I get high off of my own happiness lol). I do take a antidepressent with my Vyvanse, but when I had secretly stopped taking it, I began to get seering headaches and I would just lay around trying to get rid of the headaches. But after I stopped taking it for a while (still took my Vyvanse), the headaches stopped. But other than that, Vyvanse hasn't caused me any known symptoms. Good luck when taking it, you'll get used to it eventually.