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Nitrous oxide (N2O), popularly called laughing gas, is an inhaled agent used medically for sedation and analgesia that also produces a brief, intense dissociative state. Its psychoactive and anesthetic actions are attributed largely to noncompetitive inhibition of the NMDA glutamate receptor, the same target engaged by ketamine and xenon. Reflecting this shared mechanism, controlled trials have found that a single one-hour inhalation of 50% nitrous oxide produces rapid antidepressant effects in treatment-resistant major depression, and preclinical work shows it enhances hippocampal synaptic transmission through NMDA-dependent, TrkB- and mTOR-linked signaling that closely parallels ketamine. Neurophysiological studies further document a distinctive shift toward large-amplitude slow-delta cortical oscillations at high concentrations. The principal hazards are acute hypoxia during use and, with heavy repeated inhalation, functional vitamin B12 depletion that can cause subacute combined degeneration of the spinal cord and peripheral neuropathy.
- Fast, short euphoric rush
- Dissociation and sound distortion
- Analgesia (pain relief)
- NMDA antagonist gas with rapid ketamine-like antidepressant effects
- B12 depletion and nerve damage with heavy use
- Frostbite from cold gas
Mechanism
Nitrous oxide acts mainly as a non-competitive (N-methyl-D-aspartate) -receptor , which underlies its dissociative and analgesic effects; it also modulates other channels and may release endogenous opioids, contributing to pain relief. Critically, N2O inactivates vitamin B12 (cobalamin) by oxidizing its cobalt core, which disrupts methionine synthase and, with repeated exposure, impairs maintenance in nerves.
receptor fingerprint
Vitamin B12 (cobalamin)Oxidizes/inactivates
Non-competitive antagonist
Safetyrisks and cautions, not medical advice
The immediate risk is hypoxia: inhaling pure nitrous instead of air can cut off oxygen and cause fainting, so it is dangerous to use standing, in a sealed space, or with a mask/bag. Heavy or frequent use depletes B12 and can cause a serious neurological condition (numbness, tingling, weakness, and trouble walking) that may become permanent. Direct inhalation of very cold gas straight from a tank can cause frostbite of the lips, throat or lungs. Not medical advice.
Subjective profileweighing the evidence above
Brief and mostly benign as an occasional thing; the danger sits almost entirely in frequency. Regular use inactivates B12 and causes nerve damage that can be permanent, and the acute risk is hypoxia, so never standing, never in a sealed space, never from a mask or bag.
Resources
This entry is here for reference.
Research
- 1998first citedNitrous oxide (laughing gas) is an NMDA antagonist, neuroprotectant and neurotoxin.
- 2026most recentRecreational nitrous oxide-related myeloneuropathy in adolescents: a multicenter retrospective…
- 1.Nitrous oxide (laughing gas) is an NMDA antagonist, neuroprotectant and neurotoxin.
- 2.Recreational nitrous oxide-related myeloneuropathy in adolescents: a multicenter retrospective case series and systematic literature review.
- 3.Nitrous Oxide for Treatment-Resistant Major Depression: A Proof-of-Concept Trial.
- 4.Nitrous Oxide, a Rapid Antidepressant, Has Ketamine-like Effects on Excitatory Transmission in the Adult Hippocampus.
- 5.Ketamine and nitrous oxide: The evolution of NMDA receptor antagonists as antidepressant agents.
- 6.Efficacy and safety of nitrous oxide for patients with treatment-resistant depression, a randomized controlled trial.
- 7.Nitrous oxide-induced slow and delta oscillations.
- 8.Defining the role of NMDA receptors in anesthesia: are we there yet?
- 9.Recording Brain Electromagnetic Activity During the Administration of the Gaseous Anesthetic Agents Xenon and Nitrous Oxide in Healthy Volunteers.
- 10.Isoflurane/nitrous oxide anesthesia induces increases in NMDA receptor subunit NR2B protein expression in the aged rat brain.
- 11.Whip It Good: A Case of Vitamin B12 Deficiency and Subacute Combined Degeneration of the Spinal Cord.
11 listed here; entry last updated August 2026
Reviews
My notesprivate to this device
FAQ
Why can nitrous be dangerous even though it wears off fast?
Breathing pure nitrous displaces oxygen; people can pass out and, if they can't get air, suffocate; using it standing or with a bag over the face is especially risky.
What is the B12 problem?
Nitrous inactivates vitamin B12, and heavy repeated use can cause nerve damage with numbness, weakness, and difficulty walking that may not fully reverse.
Is medical nitrous the same gas?
Yes, it's the same molecule, but medical use delivers it blended with oxygen and monitored, which avoids the hypoxia risk of recreational use.
Adverse effects
- B12 depletion and nerve damage with heavy use
- Frostbite from cold gas
Notes and cautions
- Hypoxia and fainting risk
- Brief disorientation and loss of balance