[Dislaimer: Please use proper sterility procedures when injecting these or any other compounds. It is very important that you filter the compounds properly with micron filters, and that you follow high standards of injection hygeine.]
I have a lot of experience IVing and IMing 2C-E, 2C-T-2, and 2C-C. Let me first just start by saying that administering the 2C-x class via injection is not for the faint of heart, it is
extremely intense. You want to make sure that your doses are very low to begin with to get a feel for how this ROA works with these compounds. Jumping in at the deep end can be terrifying if you're not familiar with the sudden physiological and mental shift, and even if you are familiar, you can still be caught unaware by cockiness.
I'm going to address IV administration first:
Out of all 3 of the above compounds, I would say that 2C-C is the most physiologically demanding compound via this ROA. The effects on your cardiovascular system will take you by surprise. The speed and strength of your heartbeat alone is reason to make each injection happen mindfully; you will not be able to just plunge it in within a few seconds like you would shooting dope. Because of the speed at which the drug hits you, you will automatically recoil from injecting it too fast and have to take a breather.
2C-E and 2C-T-2 can be intense on the cardiovascular system also, but they don't have the same "emergency factor" that 2C-C does, and you will know what I'm talking about if you've done it. 2C-C is extremely heady and rushy, and it can blitz you mindless. Because of this, it feels like a very different drug when injected versus oral/intranasal. 2C-E and 2C-T-2 IV on the other hand feels a lot closer to normal ROAs than does 2C-C, but of course they are far more intense via this ROA and there are still some differences in the experience.
Now about IM administration:
Although it may seem counter-intuitive, I believe IM administration to actually be the riskier of the two methods. The reason for this is that there is a greater time lag before effects hit with intramuscular injection, and you can easily dump a whole dose in way too fast without getting the biofeedback to understand how your body is going to cope with the extra load. This is especially true with 2C-C because of the cardiovascular load, where you can inject a certain dose, and then find yourself out of your depth as your body begins to absorb it.
A much better way to do it is to start with a small dose, and inject that properly, not too fast! The instant you feel it might become overwhelming, stop. You can always go back later and try a higher dose if it wasn't intense enough for you. You can then stagger your doses, for instance by sharing a small dose between the right and left deltoid muscles. This will let you gauge how quickly your body absorbs these particular compounds from your muscles, and to get a better idea of what your next doses should be. The kinetic are different between IM and IV, but the peak level intensity is what you want to consider.
Once an IM dose hits, it feels almost the same as an IV dose, just without the same degree of insanity. It actually feels pretty damn smooth and it is a nice (but unnecessary) way to experience these chems, although the rush of IV provides more pizazz and fireworks. They can actually stay in your muscles a pretty long time and you can notice this by massaging your injection spot a couple of hours in and experiencing a sudden boost in effects.
Both ROAs:
The experience of injecting a 2C is pretty fucking insane, that's all there is to be said really. It can also be pretty fiendy, so don't be surprised if you find yourself shooting up every few hours and spending several days in a 2C-hole. Tolerance matters here, because you will find yourself chasing a high that you can't reach again without putting great stress on your body. No matter which route you choose, it is very visual, very synaesthetic, and even sometimes borders on dissociative.
The visuals are like they would be if taken orally, but more intense and 3 dimentional. Visual-auditory, visual-tactile, and auditory-tactile synaesthesia was greater than normal. Whilst 2C-E is always very clear headed via IV/IM, 2C-T-2 is incredibly immersive and sometimes bordered on dissociative and outright reality-shattering. Don't be surprised if this puts you on your ass. 2C-C is just
or 8( (without any real visuals to speak of). It's like chasing a hyperdimentional unicorn you can't catch, and it becomes almost dangerous to do so because of the stress on your heart.
Coming back to intravenous: my friend and I used to call this route of administration a "Raging Vein", because of the peculiar combination of circumstances that followed an injection. Even when the shot was completely on target the resulting vasocontriction and high incidence of collapsed, distended, and burst veins caused the material to linger in venous pouches, which could then be massaged throughout the experience to cause a second peak. At the same time, this compound burns your veins, and successive shots in to the same vein can eventually become extremely painful to the point where it is intolerable to make any further injections. The vein becomes quite swollen at the site of injection, whilst all your other arm veins are hiding due to vasocontriction. All this, whilst chasing the dragon of an ever elusive high whilst multiple syringes filled with crimson liquid from half-used shots line the room caused us to think of this nomenclature.
As you can see, intravenous administration is not good if you plan to be using these compounds regularly, because you will end up like I did, with no surface veins left. It has taken me a couple of years to get back my veins, and I don't ever intend to inflict that damage upon myself again. I recommend you avoid this method, but if you must try it, then do it sparingly and take all the necessary safety precautions. I also similarly warn you away from intramuscular due to the greatly heightened risk (over IV) of infection if you didn't follow strict sterility procedures. In fact, I would say that in general, intravenous is the safest method to choose.
All this said, oral is now on par with rectal as my preferred ROA depending on the kind of trip I want, and intranasal is the worst given the pain it causes and the damage to the mucous membranes. Oral feels very nice and smooth, with enough visual and mental intensity to satisfy for long classical trip. I prefer it to IM because with IM there seems to be something lacking. Rectal is far preferable to IM for me for fireworks, because the comeup is easier to handle, but the intensity is still there and even exceeds it in some ways. For instance, the rush you get coming up through your central meridian - all the way from the base of your spine at your ass hole up through your "chakras" to your crown is a unique and incredible sensation that isn't there with IM.
If you choose to experiment with injecting these compounds, proceed safely and make sure you have everything you need (clean needles, clean syringes, micron filters, sterile vials, alcohol wipes). I cannot stress this enough. I met up with the same tripping partner a couple of months ago, and he told me that he got pretty worried about the reckless behaviour we were engaging in. Weighing up the pros and cons, and knowing that I can get exactly where I want to with rectal/oral, I now don't see any need to go back to injection.
