[opprobium]

It is in fact psychoactive and a good anesthetic:

"How does xenon produce anaesthesia?" https://www.nature.com/articles/24525

It is not typically used in most countries because it is very expensive compared to alternatives, but it is approved in many countries for anesthesia: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3626616

I found this article very weak, but Xenon is quite a real drug.