Hi, My Daughter Has Been Diagnosed With Right Bundle Branch

Hi, my daughter has been diagnosed with right bundle branch blockage. She started using adderall Jan of this year (Against my will) as I don't think she needs it. She claims she wants to stop it, but has tried a couple of times and has gone back. She now claims she will "tapering off it. Her pulse is fast every time they check it. Is she in any danger using this horrible drug having the RBBB?