Entonox, referred to colloquially as gas and air, is an anaesthetic and analgesic used to ease pain during labour, trauma and minor surgical procedures. Entonox is the trade name for a mixture of fifty percent nitrous oxide (N2O or laughing gas) and fifty percent oxygen so a more appropriate name would be gas and oxygen. Entonox is administered by inhalation from a cylinder at a pressure of 137 bar (in the UK) or from a pipeline supply. Its analgesic effect is very fast-acting, and it is well suited to self-administration.
Entonox is produced by the BOC Group.
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