Do higher doses of vyvanse (lisdexamfetamine) help better with concentration and such? or does it just improve duration?

Could help: Higher doses of vyvanse (lisdexamfetamine) will lead to both a higher peak concentration and a little longer duration. The higher peak could result in improvement in attention and concentration, but it might not. I like to think that there is an optimum concentration, and that exceeding it can be as problematic as not reaching it. Too much vyvanse (lisdexamfetamine) can lead to agitation and excessive activation, which can disrupt.