Ty,
Are you talking about prevention of endocarditis before you go to the dentist? The medication depends on the procedure. It also depends on the heart defect.
According to the American Heart Association "Prophylactic regimens for dental, oral, respiratory tract, or esophageal procedures. (Follow-up dose no longer recommended.) Total children's dose should not exceed adult dose.
I. Standard general prophylaxis for patients at risk:
Amoxicillin: 2.0 g (children, 50mg/kg) given orally one hour before procedure.
The cardiologist should also be able to tell you what should be done.
Debbie