Gaaaaaargh!!!
I've now just read that freebase AMT is a tan/off white powder the one I've binned was bright white so I'd be careful to anyone who's recently bought freebase AMT who knows what it is
Actually pure AMT freebase that is fresh and not degraded is sparkly chalky white. The best AMT I ever had was straight from the chemist and it was bright white.
I'm not saying it IS AMT, just that it very well could be. What does it smell like? Is it a very strong smell?
How long does it take to begin affecting you if insufflated? And does it reduce the experience duration also?
Insufflated starts in like 30 minutes and peaks maybe an hour and a half, and yes it does shorten the duration. However, I strongly recommend against this for AMT. First of all, as mentioned, AMT freebase (and maybe the salts, but I don't know) is an irritant to mucous membranes and nasal cavities. It burns, BAD, for at least 20 minutes. It's honestly horrible. And it's not fast like many other things snorted, just a little faster. And about the same dose too.
PM Shambles if you're interested in smoking/vaporizing... apparently it works quite well but I haven't done it. And it still takes 30-60 minutes to come up.
Honestly the best route for me is rectal. The dose is the same, but the come-up is faster and the come-down/aftereffects are shorter, and the main effects, the peak and plateau, last about the same amount of time as with oral. Also, rectal eliminates the AMT being in your stomach which dramatically cuts down on nausea, and overall there is a lot less bodyload. It's just the best way to take it IMO, keeping in mind I have never used needles.
Be careful with this one. AET (ethyl homologue of AMT) was withdrawn from the antidepressant market for the occurrence of agranulocytosis in a non trivial amount of patients, and this was at much lower doses (especially comparing the effective dose of the two compounds). I'm not sure how much this would carry over to AMT, but I'd treat this more like MDMA and try to keep it to a few times a year, or at least avoid binging.
DEFINITELY follow this advice. Take it from me, possibly the most severe abuser of AMT ever for much of 2006 and most of 2007. If you use it sparingly, it will be a wonderful drug every time, and it will probably leave you feeling tired but in great spirits, with the antidepressant effect lingering on for days or even up to a week. No crash like with MDMA in the next few days at all.
However, if you use it too much, without allowing your neurotransmitters to replenish their stores, then you will feel the symptoms of serotonin depletion just like you can by abusing MDMA. My symptoms were extreme fatigue, extreme mood swings, feeling like I'd been run over by a truck. I would get brain zaps extremely severely, sometimes 10 or so in a row that would have me falling down in the middle of the hallway. I also had sleep paralysis and the most intense and doom-filled dreams of my life. I was generally completely miserable and nauseous along with the symptoms I described, for like 4 or 5 days, and then I felt much better (but I was still run down for quite a while... I didn't feel quite right for months after the 4-5 days but it was just a general malaise, apathy, and lots of fatigue (likely the result of me getting very little sleep at all during this entire period

)
So yeah, don't abuse it. Don't abuse any drug or any psychedelic, but definitely not AMT especially. I don't do this anymore, but when I used to use way too many psychedelics, I would take quite a variety of chemicals much too often, even 3 or 4 days in a row. These included 2C-B, 2C-E, 2C-I, 4-AcO-DMT, DOC, and AMT. Of those, only AMT left me feeling like I had hurt myself. After the others multiple days in a row, and in fact any psychedelic I've tried except for MDMA (if you consider it psychedelic even), I'd be fine as long as I could get enough sleep between those 3 or so nights.
*Please note I am NOT condoning or recommending anyone to trip multiple days in a row regularly, on AMT or anything else. It's alright for a special event like a psychedelic festival but other than that, all it does it make the psychedelics slowly begin to feel just like some other drug, nothing very magical anymore. And then even if you take a break for 7 months without anything (as I did), you will still permanently have a massive tolerance to psychedelics and a hard time having a trip that really overwhelms you and takes you for a ride.