Physiologically, it will increase both heart rate and blood pressure. However, interestingly, in some patients, they will notice a decrease in HR and BP because of stress reduction because their ADHD is being managed.
If you have specific risk factors related to conduction problems (e.g. family history, your own history of conduction difficulties, abnormal structure to your heart etc.), then seek out your doctor’s advice and get your CV system checked out.
And exercise…….unless you are a competitive athlete, don’t worry.