i can see this might become a pain in the a** to get to where i need to be, called the compounding pharmacy. they wanted to know answers to 3 questions (how long it takes for erection, duration of erection, and rigidity) then they recommend to doctor the increase of ratios. i don't want to keep playing around with the ratios, just put me there. and cost wise it costs me more for the lower dose as i have to use more and it's the same cost for the increased amount. it's $90 for 2 vials which i hear is good. answers to those questions @ 20 units of what i am taking currently are 1-20 minutes needing stimulation 2- after coming erection over 3-scale of 1 to 10 is a 3 but the erection is not a full blown erection as other men tell or as it should be. when i need refill i hope they cooperate...