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I noticed strange thing .... after I inject and have sex, my penis is erected , but not 100% (maybe 80%). However, after I orgasm, I have the strongest erection and can have it for 2 - 2.5 hours. Anybody has same issue?

No, I've not had the erection get harder AFTER sex. Hmmm Interesting!
And you stated chlorpromazin? That's a antipsychotic drug is it not?

I used to experience that.

There have been several posts in other threads about guys getting and then partially losing erections, usually depending on position they say. In a long session I can go somewhat limp, we pull out and fiddle around, stand up, and the erection comes back fully. It seems to get better with each pull. I did a 30-1.5-40 mix at 0.2 ml yesterday and ended up good and hard after E for an hour, ready for another 50 minutes. Wifey had enough though. It might be that the chemical is getting better distributed and absorbed?

I experience the same thing. Although I get super hard erectiins amwith 3-4 units of 40/30/2 Trimix my erection gets even harder after orgasm. I just lay down on my stomach and go to sleep. The erection usually goes away after 2 hours of vigorous sex and another extra hour.