Not really true. Doctors All take Hippocrates oath.to treat the ill to the best of one's ability, to preserve a patient's privacy, to teach the secrets of medicine to the next generation. unless the doctor is a charlatan he is bound to secrecy
You should go back to your doctor, here is not the place for medical advice, viagra has effect on blood and heart!
and you have heart issues?? Going under or over a prescription without consulting is not recommended, do the right thing.