Short answer: Nitrous oxide is a gas used in dentistry and as a whipped-cream propellant. Inhaled recreationally from chargers, tanks, or flavored canisters such as Galaxy Gas, it causes brief euphoria and dissociation. In 2025 the FDA warned the public not to inhale it, after rising reports of nerve damage, paralysis, and death.
Key takeaways
- What it is: Nitrous oxide is an inhaled dissociative anesthetic gas and not a federally controlled substance.
- Medical use: Dental and medical anesthesia; pain relief in labor.
- Timing: effects start in seconds and last 1 to 3 minutes per inhalation.
- Most dangerous mix: Alcohol, which can cause more confusion, fainting, and vomiting.
- Naloxone: it does not reverse this drug, but give it whenever opioids could be involved.
- Dependence risk: Moderate (psychological).
- Legal route: nitrous oxide is not federally scheduled as of October 2026, but state bans, FDA restrictions, and pending federal action can apply; check current status.
What is nitrous oxide?
Mixed with oxygen and given by trained staff, nitrous oxide is a safe, widely used anesthetic and pain reliever in dentistry and childbirth.
Inhaled nitrous oxide causes euphoria, giggling, lightheadedness, distorted sounds, numbness, and a dreamlike, dissociated state that fades within minutes.
Quick facts
| Fact | Nitrous oxide |
|---|---|
| Chemical name | Dinitrogen monoxide (N2O) |
| Drug class | Inhaled anesthetic; NMDA receptor antagonist |
| US legal status | Not federally controlled; FDA-regulated as a medical gas and food additive; many states restrict sale for inhalation |
| Medical uses | Dental sedation, labor pain, anesthesia |
| How it is misused | Inhaled from balloons filled from whipped-cream chargers, tanks, or large flavored canisters |
| Onset | Within seconds |
| Key danger | Inactivates vitamin B12, causing nerve and spinal cord damage |
How long does nitrous oxide last?
- Starts working: Seconds
- Effects last: 1 to 3 minutes per inhalation
Timing varies with the dose, the form, how it is taken, liver and kidney function, age, and other drugs taken at the same time.
What are the biggest risks of nitrous oxide?
Nerve damage: nitrous oxide inactivates vitamin B12. Frequent use can cause numbness, tingling, weakness, trouble walking, and paralysis-like spinal cord damage (subacute combined degeneration), sometimes permanent.
Oxygen deprivation: inhaling straight from a tank or in an enclosed space can cause suffocation, fainting, and death.
Injuries: fainting causes falls; gas straight from a charger or tank is extremely cold and can freeze the lips, throat, and lungs.
Warning: Regular nitrous use can cause permanent nerve damage. Anyone with numbness, tingling, weakness, or trouble walking should see a clinician and say they have used nitrous; B12 treatment works best early.
What should you never mix with nitrous oxide?
| Combined with | What happens | Guidance |
|---|---|---|
| Alcohol | More confusion, fainting, and vomiting | Avoid |
| Sedatives and opioids | Unconsciousness and choking | Dangerous |
| Other dissociatives (ketamine, DXM) | Profound confusion and unconsciousness | High risk |
| Methotrexate and conditions with low B12 | Worse B12 and folate damage | Avoid |
Check any combination with the DoseUses combination checker or ask a pharmacist.
What are the signs of a nitrous oxide overdose, and what should you do?
Overdose and oxygen deprivation cause fainting, seizures, abnormal heart rhythms, suffocation, and death. Deaths have occurred from inhaling in cars or with bags over the head.
If someone is unwell after using it
- Call 911 if the person is unresponsive, having a seizure, struggling to breathe, or has chest pain.
- Place a drowsy or unconscious person on their side so they do not choke.
- Give naloxone if opioids could be involved. It is safe even if they are not.
- For advice when the person is awake and stable, call Poison Help at 1-800-222-1222 (US, free, 24 hours).
Is nitrous oxide addictive?
Nitrous oxide does not cause dangerous physical withdrawal, but some people develop compulsive, heavy use, sometimes going through hundreds of chargers or large canisters a day.
- DaysCravingsUrges to use, irritability, and low mood.
- WeeksRecoveryNerve symptoms may improve with vitamin B12 treatment.
- MonthsHealingSevere nerve damage can take months to improve and may be permanent.
See the withdrawal timelines and the full nitrous oxide withdrawal guide.
Is nitrous oxide legal?
Nitrous oxide is not a federal controlled substance. The FDA regulates it as a medical gas and food additive, and in March 2025 advised consumers not to inhale any nitrous oxide product, naming brands such as Galaxy Gas.
- State law: most states make it illegal to inhale nitrous oxide for intoxication or to sell it for that purpose, and several have restricted flavored canisters or sales to minors.
- Driving: driving under its influence can be prosecuted as impaired driving.
Outside the United States
| Country | Status |
|---|---|
| United Kingdom | Class C (since November 2023) for psychoactive use |
| Netherlands | Banned for recreational use since 2023 |
| International | Not under UN control |
Frequently asked questions about nitrous oxide
What are whippets?
Whipped-cream chargers containing nitrous oxide, inhaled from balloons to get high.
What is Galaxy Gas?
A brand of large, flavored nitrous oxide canisters. The FDA warned consumers not to inhale it or similar products in 2025.
Can laughing gas cause permanent damage?
Yes. Heavy use can cause nerve and spinal cord damage from vitamin B12 inactivation, which may be permanent.
Is laughing gas at the dentist safe?
Yes. In dental care it is mixed with oxygen, given briefly, and monitored.
Is nitrous oxide illegal?
It is not federally controlled, but most states prohibit inhaling it or selling it for that purpose.
Sources
- FDA advises consumers not to inhale nitrous oxide products, US Food and Drug Administration, 2025.
- Inhalants DrugFacts, National Institute on Drug Abuse.
- National Helpline, Substance Abuse and Mental Health Services Administration.
- FindTreatment.gov, Substance Abuse and Mental Health Services Administration.
- International drug control conventions, United Nations Office on Drugs and Crime.
This guide summarizes the sourced DoseUses Nitrous oxide profile, written from FDA labels, DEA rules, and federal health agencies. It is educational and is not medical advice. Last updated October 5, 2026.
