Nitrous oxide at a glance: schedule, half-life, and class
- 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
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.[1]
It is sold legally as a food propellant, but in recent years large flavored canisters marketed with names such as Galaxy Gas, Cosmic Gas, and MassGass have been sold in gas stations, vape shops, and online, appealing to young people.[1]
Nitrous oxide effects and how long they last
Inhaled nitrous oxide causes euphoria, giggling, lightheadedness, distorted sounds, numbness, and a dreamlike, dissociated state that fades within minutes.[1]
Nitrous oxide side effects and risks
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.[1][2]
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.
Other harms: blood clots, psychiatric symptoms, and dangerously low blood pressure.[1]
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.
Nitrous oxide interactions: what is dangerous to mix with it
Choose what it would be combined with:
| 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 |
This is not a full list. Combining substances raises the risk of harm, especially when the contents of street drugs are unknown.
Nitrous oxide overdose: signs and what to 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.[1]
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.[2]
- 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.
Is nitrous oxide legal in the US? Schedule and legal status
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.[1]
- 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.
Where can someone get help with nitrous oxide use?
- SAMHSA National Helpline: 1-800-662-4357. Free, confidential, 24 hours a day, in English and Spanish. It gives referrals to local treatment and support.[3]
- FindTreatment.gov: a federal locator for state-licensed treatment programs, searchable by location, payment, and type of care.[4]
- 988 Suicide and Crisis Lifeline: call or text 988 for a mental health or substance use crisis.
- Your own clinician: a primary care doctor can screen, treat, and refer, and can discuss medicines that support recovery where they exist.
Nitrous oxide legal status in other countries
| Country | Status |
|---|---|
| United Kingdom | Class C (since November 2023) for psychoactive use |
| Netherlands | Banned for recreational use since 2023 |
| International | Not under UN control |
Laws change and differ in detail. Check current rules before carrying any controlled medicine across a border.[5]
Common 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.
