I can't remember if it is okay or not, I didn't drink kava 30 hours before the procedure because I was clearing my stomach for the procedure, definitely okay for afterwards but you may not want it. The stuff they knock you out with (usually
Propofol) make you feel a bit groggy and you will probably not want kava after that, maybe at night after.
Don't stress the Colonoscopy, it's the BEST nap you'll ever take, as my Doc put it to me..,and he was right.