Will working out while taking vyvanse (lisdexamfetamine) speed up my heart rate too much?

Probably not: The body's system that regulates many such automatic responses works on a feedback mechanism, so equilibrium of these functions is achieved after initiating medication. If you monitor heart rate closely, for example on a treadmill or elliptical, you will likely find very little difference in pre & post-medication rates. As usual, check with your doctor for any perceived symptoms.

Vyvanse (lisdexamfetamine): Depends on dose, how long u have been on it, the type and duration of the workout, and your general health status. Review with your doctor.