My math may be wrong, but if you break it down to 1 ml volume, which is what the rest of us here see on our vials, then yours would be :
16.8mg per 1ml papaverine (75 by 4.5)
.56mg phentolamine (2.5 by 4.5)
.056mcg Prostaglandin (25mcg by 4.5)
so 16.8/.56/.056 per 1 ml compared to most guys standard script
of 30/1/either 10 or 20 mcg. So, the way I see it, it's half strength to mine and MOST others here.
Use the PPP method and start low, work up. That's what I would do if it were me. You got the rest of your life to work up to it, but one trip to the ER will surely take some of the attraction of chemical sex away.