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I am a 69 years young and just received my trimix of 30-1-10
I will be going to have my test injection in two days they are starting me at 0.2ml I my using a insulin syringe that is 0.00 to 0.50 so my question is I would like to start my first shot at 0.05 and work my way up only looking for 30 to 45min hard don't know if that is because everything I read most guys are two to three hours

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As bldoink says, every guy is different.
When I started Trimix, it took some time to figure out what the right dosage was.
I enjoyed the 2 hour erection.
I started out low after having the first injection done by my urologist.
I would get fully hard in 10 mins. and stay hard for about 2 hours.
He told me to slowly increase the dosage until I found the right amount that worked for me.
Just don't make a big jump in dosage.
Also, with Trimix, your erection doesn't go down after you ejaculate. it goes down as the trimix wears off.
You should have a chubby, but not fully hard for up to 2 hours after.
Enjoy it

I usually enjoy a solid erection within a few minutes, then a fairly good erection when she gets me off and then a thick chubby for about an hour or so. It's not fully hard but still fun. I'm hesitant to increase the dosage since this works well for me unless I miss! My urologist also gave me an "antidote" that I could inject if it stayed hard for too long. She wouldn't issue the prescription without it although I've never had to use it.

I had to try several prescription strenghts of Tri-Mix ( three to be exact ) to find the one that worked for me, and even then I had to try several different doses before I achieved an erection that was a success. For me, my current Rx only takes about 5 minutes to get me to my best size and firmness. And I will remain fully hard for just over an hour. But as I lose firmness, I can remain full and chubby for another hour or so. I did find that once in awhile as I start going soft I would get a slight ache at the base of my shaft and above my scrotum. No pain .......... just a bit uncomfortable.

I had to try several prescription strenghts of Tri-Mix ( three to be exact ) to find the one that worked for me, and even then I had to try several different doses before I achieved an erection that was a success. For me, my current Rx only takes about 5 minutes to get me to my best size and firmness. And I will remain fully hard for just over an hour. But as I lose firmness, I can remain full and chubby for another hour or so. I did find that once in awhile as I start going soft I would get a slight ache at the base of my shaft and above my scrotum. No pain .......... just a bit uncomfortable.

Sounds like a good approach. I started low and went up in 0.05 ml increments until finding my Goldilocks zone at .15 ml.

The corpora cavernosum have fluid connections in the last 2/3 of penis length. I was told to squeeze my length 6-8 times right after injecting to get some Trimix into the other corpus. This to get a symmetric erection.

Start at the lowest dose and test your way up. The first time I injected was at the doctor's office. Four plus hours later I was back still hard and needed to get drained. We then reverted to the smallest dose which works great for me, 45 -90 minutes and I stay hard until I orgasm.

New at this lol--I did injection #9 last night (and had a great time!)
I'm using NB-243 trimix formula. I started at 10 units, but 15 gives me a totally reliable, very hard erection for about 90 minutes. I have antidote, both injection & Sudafed tabs, but haven't needed it yet.
Once I realized I was in the 15 unit range I got 50cc syringes (still 30ga 1/2") for better dosing accuracy.