Nitrous oxide (medication)
Gas used as anesthetic and for pain relief
Nitrous oxide, as medical gas supply, is an inhaled gas used as pain medication, and is typically administered with 50% oxygen mix. It is often used together with other medications for anesthesia. Common uses include during childbirth, following trauma, and as part of end-of-life care.
From Wikipedia, under CC BY-SA. More on occurri.