Viagra may not just be for dads anymore. Drugs can often be used for multiple unrelated purposes, and it turns out sildenafil , the generic version of Viagra, might help children and young adults with heart defects. A recent small study has found that the drug helped improve the functioning of the heart in a group of children who had a specific type of congenital heart defect. Sildenafil is already used to treat high blood pressure in the lungs, and some evidence has shown it might be able to treat adults with heart failure. Talk to your child's cardiologist about emerging hear...