Gas is the only way to go...I ask them to slap it on me as soon as possible ...Especially before they start reaching for any needles...You can hear and see EVERYTHING that is going on but for some reason you just don't care and the minute they give you a litttle oxygen it clears your head and you can leave and drive home...Can't get better than that...I had them use it to pull out 2 wisdom teeth...I swear by the stuff...