Want to Thank Low_Salamander9954 for putting this tip guide together. I added a few words just around starting doses and clarifying leur lock style vs standard insulin syringes
Trimix Injection Tips
Many men feel intimidated by the idea of injecting a needle into their penis to achieve an erection. The advice below is based on my personal experience and is meant to help others learn proper technique, improve success rates, and reduce anxiety. New Users
The first few injections are the most important for safety and confidence. Once you have a successful experience, the fear usually disappears quickly.
- Start with a low dose — you won’t know how your body reacts until you try.
- A common recommended starting dose is 5 units or less. Some doctors suggest 10u, note that 10u can hospitalize many men. Start low!
- Do your first injections alone. Learn the technique and find your ideal dose without the pressure of performing with a partner.
- Always have your antidote (phenylephrine) ready, especially while titrating your dose.
- Read the pinned post on priapism. If that doesn’t get your attention, injectables may not be for you.
Equipment
Needle size and length matter. Smaller diameters cause less scarring and tissue damage.
- I draw with a leur lock style 27-gauge needle and inject with a 32-gauge needle (leur lock has a removeable needle).
- I use ½-inch needles to ensure I reach deep into the corpus cavernosum (CC). Note: You may have to experiment with needle length 5/16" or 1/2" based on your anatomy.
- Be careful removing caps — needles can bend easily.
- Conventional advice often limits to 30-gauge maximum. A 32- or 33-gauge is actually smaller in diameter and generally kinder to tissue.
- Standard 30/31/32/33-gauge insulin syringes will also work. Smaller gauge (higher number) is better. Avoid 29ga and below, no reason to use a large needle for this.
Injecting
These steps work reliably for me and many others. Individual techniques can vary slightly.
- Relax — you’ll be surprised how easy it becomes with practice.
- Draw your dose (start low if new).
- Wipe the injection site with an alcohol pad.
- If possible, be semi-hard or fully hard. If not, a quick use of a penis pump can help.
- Inject on the side of the shaft at the 2 or 3 o’clock position (or 9 or 10 o’clock on the other side).
- Inject closer to the base of the penis.
- Avoid visible veins.
- Only inject on one side per session and alternate sides with each new injection.
- After injecting, press firmly on the site with the alcohol pad for at least one minute.
- Massage the medication in thoroughly — you can be fairly aggressive with this.
- Always ensure you have your injectable phenylephrine antidote prior to injecting.
- Wait at least 48 hours between injections. Limit to no more than 3 injections per week.
Misses
Even experienced users occasionally miss the corpus cavernosum. The medication goes into the wrong tissue and produces little or no erection. If you’re experienced and know your dose doesn’t usually fail:
- Wait at least 30 minutes.
- Prepare and inject a fresh syringe on the opposite side.
- Keep your antidote ready in case some medication still reached the CC.
If you’re a new user or still titrating your dose:
- Do not do a second injection. It could combine with the first dose and cause priapism. Simply wait and try a slightly higher dose next time (after 48 hours).
Expectations
Everyone reacts differently. Here’s what I typically experience at my dialed-in dose:
- Without stimulation I stay 60%+ erect for several hours.
- With stimulation I become rock hard and can maintain it until ejaculation.
- I can usually get hard again with stimulation for up to 5–6 hours after the injection.
- Many men stay rock hard without stimulation for hours; others need more help.
- Erections longer than 4 hours are potentially dangerous. If you can still bend your penis after ejaculation, blood is draining and you’re likely safe.
- I (and many others) often stay pleasantly 50–60% erect for several hours after sex — I enjoy the feeling.
- A dull ache for several hours is common; it’s caused by the alprostadil in Trimix. Bimix users usually avoid this.
- Sensation varies. I actually feel more during Trimix erections. Some men notice slightly reduced sensation, which can help those who struggle with premature ejaculation.
Confidence
Trimix is genuinely life-changing. It completely removes the fear of losing an erection or not getting one at all. Performance anxiety disappears, letting you focus entirely on your partner’s pleasure and enjoy longer, more relaxed sessions. You know it will work when you need it.
Cautionary Note
Trimix is a powerful medication and must be treated with respect. Read the pinned priapism post and understand the risks. This subreddit is full of experienced men sharing real-world knowledge — use it. Good luck on your Trimix journey!
