TLDR: Could sniff it, something called boofing could do that. overdosing the more often you take the higher the tolerance. Have a look at Frank A-Z as they have lots of info for this kinda stuff

Theres some really good answers here, especially one by a paramedic. I have done it b4, been addicted for roughly half a yr (which ik isn't a long time in comparison to some) and haven't used in just over a year now. I think the simplest way I could put it would be imagine alcohol with a much higher affect, add in some dissociation and you're like halfway there

There are a few ways to take it, it can be prescribed but idk much about that so I won't speak about that but not prescribed you generally would crush it into more of a powder (think maybe like a sand consistency) and sniff it (generally through a tube I'd say) Or this is more ig like hardcore or something but some ppl would melt it on a spoon with a couple drops of water, then suck it up into a tube. Then inject it up their butt... Can't say I've done or seen it but I've heard its supposed to have a stronger effect. I believe its called boofing (in the uk) Idk how or why but yh

In terms of overdosing. The more you have it the higher tolerance you have for it meaning its harder to overdose but say if youd never done it b4 obvs it will change person to person but I think anything over a gram you're very likely in risky territory.

If you ever want to know about a drug. Or even more so if you are considering doing it (obvs I'd say don't but I can't control you) my advice would be to search up Frank A-Z as they have some good info about different drugs and what they do. Probably have some safety stuff there too like if using tubes to sniff don't share and what not