Hi, welcome to PV! AMT is great choice – I love the stuff! :love:
If it’s the very first time you’ve tried it, and if this is the first of the batch you’re going to take, then me being the cautious person I am would say take 20mg and wait an hour, just to ensure you haven’t been sold poison/something else or that your body isn’t abnormally sensitive to it, then take the rest. It’s a 12 hour plus trip, so waiting one at the start isn’t gonna dent it that much. Might feel a bit nauseous but that’s normal and will pass, and 20mg should be enough to let you know somethings going on…
I’ve found 50mg is about perfect for me. Tried 25mg first time, 50mg second, 80mg third but the physical side effects of that – lotsa jaw clenching and I literally wasn’t able to pee for several hours despite being utterly busting – weren’t compensated by any extra trippyness, so I’ve sorta settled on 50mg. And hey, if you got 100mg… makes it easy to just split it in half to get 50mg, assuming you don’t have milligram scales 😀
Once you know what you’ve got is AMT and your body is fine with it, you can knock back the rest in one go, next time.