PGE-1 is the active ingredient in Caverject and it is one of the ingredients in Tri-Mix so its a decent alternative, but as there are bi-mix, tri-mix and quad-mix there is a reason why the PGE-1 is not the only version out there, as we are all unique individuals, you have to see what works for you. If this is all you have available, try it and see if it works for you.