My resting heart rate is about 106 bpm. i just restarted taking vyvance after a month break. is this normal. ?

Fast heart rate: 106 beats per minute is slightly faster than a typical heart rate. Fast heart rate can be caused by anxiety and/or taking stimulants. In the absence of heart disease or other symptoms it isn't to worrisome but you should talk to your doctor.

Possibly: Vyvanse (lisdexamfetamine) may be a component of the rapid heartbeat. But other things, both physical and environmental may be contributing. I am sure your doctor would want to evaluate the cause. Contact him/her