While it technically binds to most 5-HT sites, AMT's highest affinity is for 5-HT2a, which is actually rather high at around ~50nM (double check on that, its been a while). I do know that its affinity for 5-HT1a is around 1/40th that of 5-HT2a, around 2000nM (yes, seems odd, considering AMT has negligible visual activity, this is the reason why I roughly recall the affinities). I do not recall the affinity for 5-HT3, but I would bet the number is high, certainly well into the uM range (micromolar, my phone's voice recognition software doesn't bring up the symbol for "mu", although for some reason it recognizes "delta"). My point being, perhaps its low affinity for 5-HT3 explains why it does not have a pronounced appetite suppression........
AMT is a rather potent releaser of NE, and like amphetamine is also re-uptake inhibitory. However, AMT's potency as a releasing agent of monoamines is greater than its affinity for the transporters. I would assume neurotoxicity would be a serious issue with continued use of this drug.
But, I never liked AMT. I played a mean joke on a friend many years ago (decade), I prepared a finely chopped up line of AMT (~80mg), and told my friend it was cocaine. He snorted it, eyes started watering, face turned red. That stuff hurts. 8 hours later he evidently called up an ex-girlfriend in the middle of the night to tell her that he "still loves her" or something to that effect. All in good fun.......