That's the same drug they give you when they need you conscious but pliable for things like wisdom teeth extraction and butthole scopes and the like.
I did the minimum research but it looks like they still use N2O for wisdom teeth (?), but they do use drugs like diazepams for colonoscopies - basically hard core Ativan that blocks all the bad stuff.
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This is the drug of choice at the moment for these type of things. You are aware and awake but stop forming memories until it wears off.
Propofol - Wikipedia
en.wikipedia.org
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