I am 92 and I am responding to the discussion concerning alprostadil 500mcg/ml. I order and received the aforementioned med. I have had it for a few days trying to figure out how to use it. Online there’s so much online that is irrelevant. I have a 1 ml of med in an ampule, so I transferred the contents to a sterile container. There was a very small amount remaining in the ampule after had drawn the ml, so I added about .2 ml of Biostatic water and injected it just like I do with Trimix. And wow, I decided to get on elliptical exercise machine and after 30 minutes I still had an erection, it was probably an hour before things subsided, but it was still semi rigid. More to follow, but it seemed more effective than the Trimix I have been using.