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My trimix does not work fully until AFTER an orgasm. For instance, if I inject 12 units, I get hard enough to have sex (just barely), but after I ejaculate, my erection is so strong that I sometimes need phenylephrine. If I lower the dose, I can't have sex. If I increase the dose so that I am fully erect during sex, my post-sex erection will be so strong that I could end up in the E.R. Has anyone had this problem? Have you solved it?

What time are you referring to?
For example, After you inject, how long does it take to get hard enough for sex?
Then how much time till your ejaculate?
And finally how much total time are you erect?

Maybe your erections follow a bell curve.
You might be hard enough for penetration in 10-15 minutes, And if you ejaculate within 10 minutes.
Your peak erection may then be at 25-30 minute mark. (after ejaculation)

Just guessing here. My first guess would be along the lines of what sogwap said. That and you may not be getting any natural engorgement possibly even including glans engorgement until maximum excitement as in right before the big O.

Alternatively you may need to have your doctor tweak your mix. A PDF from a compounding pharmacy (Wedgewood) does a pretty good job of explaining the effect of different tri-mix ingredients. Interestingly they no longer do compounding for humans and now specialize in veterinary compounding. Anyhow, here it is: http://www.wedgewoodpharmacy.com/uploads/ED%20Switching%20Guide.pdf

The PDF suggests to me (and I don't know squat) that a mix with a lower concentration of papaverine might be worth trying.

Thank you so much for your replies!

Just to clarify, I get much harder right after sex *no matter how long it takes to orgasm*.

If I inject at 1:00, and my wife and I start to have sex at 1:15, and I finish at 1:45, then I get rock hard at 1:50.

If I inject at 1:00, and I wait until 1:45 to have sex, and I finish at 2:15, then I get rock hard at 2:20.

And if I wait too long to have sex, I will miss the boat, and will not get rock hard at all.

My situation does not appear to be conditioned on time.

And it does not appear to be conditioned on my level of stimulation, etc.

After you ejaculate, what are you doing?
Do you get up and walk around? Go for another round of sex?
Or maybe enjoy the afterglow?
Or something else?

Thank you for your reply, sogwap. After sex I am standing and/or walking, taking a shower, etc. In theory, this activity could account for my rock hard erection. But that seems doubtful, because I am moving around quite a bit during sex, yet still have trouble maintaining an erection.

My best guess, and this is only a guess, is that the act of ejaculating has the effect of distributing the trimix into all the little pockets of tissue that it did not reach previously.

I wonder if this is because, when ejaculating the pelvic muscles actually push blood into the cavernosium, and so it stays there, keeping the penis hard.

Usually this action by the pelvic muscles makes the penis bounce up and down as the spasms cause blood pressue increase in the penis.

Samuel,

When you are having sex before you ejaculate, how is your anxiety?
Are you at all anxious or are you physically exerting yourself?