Interestingly, I found that hopping in a hot tub for 15 minutes or so immediately after the injection makes a huge difference. I think I can use less than half the regular dose, get much harder, and much longer.

I got 5 ml of quadmix (which at my dosage is about 200 doses) for $120 from my local compounding pharmacy - but I only paid to $40 due to my insurance co-pay. The first batch lasted nearly 2 years in the fridge. It was a bit weird -- it basically suddenly stopped working, not some kind of slow degra...