1g/day is a pretty extreme dose, even disregarding that most users don't consume it daily.
Ketamine tolerance upon continued use can reach some really wild levels. I’ve worked with people who reported that a 1g single dose nasally won’t get them properly high.
So I'd say it's used in humans for anesthetic too.
And guys, I'd the doc says after your first dislocation you should have the surgery to prevent it from happening again, you should listen to them so you don't spend a night in excruciating pain three months later.
For what it's worth, when I came too I felt like I was black out drunk, not a good experience for a previous alcoholic
I think for therapy with humans it is also given as a nasal spray.