Consider a lower dosage of a long-lasting stimulant instead. You won’t feel a rush like instant release, but it’ll manage symptoms much more sustainably in the longer term. Shouldn’t be any issues for your heart this way (I’m monitored regularly and have never been healthier).

A lower dosage of Vyvanse split into two worked for me after my doctor sent me for a psychiatrist consult. It eliminated the crashes. It’s also important not to chase the euphoria that comes with a new dosage (it’s a temporary side effect). It’s okay not to feel 100%. Trying to keep the euphoria will end up with higher and higher dosages.

Consider asking your doctor for a psychiatrist consult.