Background: Nitrous oxide (N₂O) is used worldwide for analgesia and anesthesia. It is also used for recreational purposes by some people. N₂O can have major side effects (myeloneuropathy, delusions, emphysema) when used to excess. In France, N₂O is available as an equimolar mixture of oxygen and nitrous oxide (EMONO). Its substance use disorder potential is monitored by the French Monitoring Centre for Addiction (CEIP-A) network.

Our objective is to provide an overview of the substance use disorder potential of N₂O in general, and of EMONO in particular. Methods: This paper is based on a systematic review of the literature for case reports involving N₂O use disorder and on CEIP-A network cases involving EMONO use disorder. We characterized use disorder in accordance with DSM-5 (Diagnostic and Statistical Manual of Mental Disorders, 5th Edition) criteria. Furthermore, we considered data relating to medical history, age, gender, and N₂O consumption habits. Results: We identified 59 cases of N₂O use disorder in the literature and 17 cases of EMONO use disorder from the CEIP-A network. More than 90% of the cases used N₂O in larger quantities and for longer than intended. Conversely, more negative as opposed to positive cases have been documented regarding tolerance and failed attempts to reduce usage. Conclusions: A specific profile of substance use disorder starts to emerge from all the cases studied here. Furthermore, we identified another way N₂O use disorder can appear: through exposure for medical purposes.

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Nitrous Oxide: What do we Know about its use Disorder Potential? Results of the French Monitoring Centre for Addiction Network Survey and Literature Review