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ALnox™: Nitrous oxide / Oxygen (50/50)

Air Liquide Healthcare's pre-mixed 50% nitrous oxide and 50% oxygen gas, used as an analgesic drug for pain management.

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ALnox™ (50% nitrous oxide N2O / 50% oxygen O2) is used as an analgesic drug for for conscious sedation to safely and effectively manage pain and anxiety during elective diagnostics and therapeutic procedures.

Medical applications

ALnox™ delivers safe sedation and analgesia for elective diagnostics and therapeutic procedures that can provoke significant anxiety or pain in adult or pediatric patients. It does not cause loss of consciousness and the laryngeal closure reflex is maintained, making it safe against anaesthetic effect or respiratory drive depression.

ALnox™ is very well tolerated and with 50% oxygen, the risk of hypoxemia is minimized. With rapid reversal, the effects disappear in 1 to 3 minutes.

Medical nitrous oxide is used in adults and children for:

  • General anaesthesia – usually as an adjuvant to other volatile or intravenous anaesthetics
  • Pain relief – employed with oxygen for analgesia in moderately painful procedures, such as dentistry, obstetrics, and fractures
  • Conscious sedation – effective and safe sedation technique for the reduction of stress in the apprehensive or anxious individual

Medical nitrous oxide is sometimes used as an adjuvant of balanced anesthesia for surgical interventions, enabling reduced doses of other drugs and facilitating their post-operatory elimination.

Analgesia administration system

The Equinox® II administration system by O-Two is a rugged demand inhalation unit for the administration of ALnox™ (50% N2O/50% O2 analgesic gas mixture), offering a simple, safe and efficient way of delivering pain relief during trauma, childbirth or painful procedures. 

The Equinox® II Demand Valve delivers high flow rates with low triggering pressures, reducing the amount of effort required by the patient, to maintain the demanded flow. 

Contact us to learn more about using this gas delivery system for your practice.

Product information


Product form: Mixtures
Trade name: ALnox™
Formula: Equimolar mixture of N2O / O2
Synonyms: Equimolar mixture of Medical nitrous oxide and Medical oxygen / Nitrous oxide USP and Medical oxygen USP mixture / Oxygen (50%) in Nitrous oxide


Name Product identifier % Classification (GHS-CA)
Oxygen (CAS-No.) 7782-44-7 50 Ox. Gas 1, H270 Press. Gas (Comp.), H280
Nitrous oxide (CAS-No.) 10024-97-2 50 Ox. Gas 1, H270 Press. Gas (Comp.), H280 STOT SE 3, H336

Ordering information

Cylinder size guide

We offer ALnox™ (DIN: 02071010) to help you meet your healthcare objectives and the needs of your facility.

Ordering number Cylinder size  Content Pressure at 21°C  (P.S.I.) CGA connection Height Diameter Weight Cylinder Shoulder Colour 
SG791269A 5 (E) ALnox™ —50:50 mixture N2O and O2   965       Medical blue & white

Safety information

Nitrous oxide requires special care due to its oxidizing nature. Know the hazards and promote education for your patients and medical staff, to avoid safety hazards and create a safe work and living environment.

Safety data sheet (SDS)

Safe cylinder handling

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Air Liquide Healthcare
6990 Creditview Road, Unit 6
Mississauga, ON L5N 8R9

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