ENTONOX is a ready-to-use medical gas mixture consisting of 50% nitrous oxide and 50% oxygen for use in all situations where analgesia and sedation with rapid onset and offset is sought. ENTONOX nitrous oxide/oxygen mixture provides the pain relieving properties of nitrous oxide with the benefits of additional oxygen without producing unconsciousness. It is a widely used analgesic for acute, short-term pain relief in a diverse range of clinical situations, from painful procedures to childbirth.