https://en.wikipedia.org/wiki/Sildenafil
Give this stuff a try. Doctor just prescribed this stuff to me a few weeks ago. He said it was the original viagra and had been prescribed for blood pressure but it was giving people stiffys. So they changed the name to Viagra and raised the prices. I get 100 20mg pills of Sildenafil for $50 out of pocket with prescription. Works just like viagra. Just thought I would share.