商品名：Entonox*, Nitrous oxide*
Causes CNS depression.
Used with oxygen to carry volatile anaesthetic agents such as isoflurane for the induction and maintenance of anaesthesia. N2O reduces the concentration of inhalant agent required to maintain anaesthesia. Administration of N2O at the beginning of volatile agent anaesthesia increases the speed of uptake of volatile agent from the alveoli (via the 2nd gas effect and concentration effect), hastening attainment of a stable plane of volatile agent anaesthesia. Oxygen must be supplemented for 5–10 min
劑量數字暫停提供：VetPro 的劑量改依 DRUGAPI 藥物資料庫對外的內容，DRUGAPI 目前不提供可直接計算的劑量。下方列出 DRUGAPI 的審查結論與劑量審查引用的來源；計算機可手動輸入劑量換算。
Nitrous oxide 是吸入百分比方案，必須有氧氣、校準供氣、氣體監測、氣道／通氣急救、封閉氣腔篩檢與廢氣回收；不可表成 mg/kg、mL/kg、注射、口服或帶回家處方。
DRUGAPI 劑量審查引用的獸醫官方標示（各標示只適用於其產品、物種與法域，不可互換）
依出現頻率分組；嚴重副作用獨立列出，臨床上需立即辨識。