What can you inject someone with to knock them out?

Question

This is not for use, just a book i'm working on. But it needs to be real if you know what i mean.
I'm looking for something that will knock someone out for a bit but not harm them otherwise. Preferably an injection.

I see your concern Joey, i could get something locally for "daterape", but was wanting something a little more unusual for a BOOK I'M WRITING

Answer 1

Versed.