My boyfriend, for the past year and a half, has had E.D. for over 20 years now. We tried Viagra, and that only partially helped for about 15 minutes. So, we went to this Men's Sexual Health Clinic that advertised 100% effectiveness or your money back. They did an ultrasound and said that his blood flow was fine and set him up with these injections that he administers directly into the side of his penis. The dosages are adjustable as needed, for effectiveness.