Medicinsk Oxygen Air Liquide: Uses, Dosage & Side Effects
Medical-grade oxygen (O₂) for the treatment of hypoxemia and respiratory conditions
Quick Facts About Medicinsk Oxygen Air Liquide
Key Takeaways About Medical Oxygen
- Essential emergency treatment: Medical oxygen is a life-saving medication used in cardiac arrest, severe asthma, trauma, and many other critical conditions
- Target saturation matters: The British Thoracic Society recommends SpO₂ of 94-98% for most patients, and 88-92% for those at risk of CO₂ retention (e.g., severe COPD)
- Too much can be harmful: Excessive oxygen in COPD patients can suppress breathing drive, causing dangerous CO₂ buildup and respiratory failure
- Fire safety is critical: Oxygen supports combustion vigorously — keep cylinders away from open flames, sparks, oils, and greases
- Multiple delivery methods: Nasal cannula (1-6 L/min), simple face mask (5-10 L/min), Venturi mask (precise FiO₂), and non-rebreather mask (10-15 L/min) serve different clinical needs
What Is Medicinsk Oxygen Air Liquide and What Is It Used For?
Medicinsk Oxygen Air Liquide is pharmaceutical-grade oxygen (O₂) used to treat hypoxemia — dangerously low levels of oxygen in the blood. It is administered by inhalation and is essential in emergency medicine, perioperative care, management of chronic respiratory diseases, and many other clinical settings.
Oxygen is the most abundant element on Earth and constitutes approximately 21% of the atmosphere we breathe. In medical practice, oxygen has been used therapeutically for over a century and is listed on the WHO Model List of Essential Medicines, underscoring its fundamental importance in healthcare worldwide. Medicinsk Oxygen Air Liquide is manufactured to the standards of the European Pharmacopoeia (Ph. Eur.), guaranteeing a minimum purity of 99.5% with strictly controlled levels of contaminants.
The primary indication for medical oxygen is hypoxemia, a condition in which the partial pressure of oxygen in arterial blood falls below normal levels, leading to inadequate oxygen delivery to tissues and organs. Hypoxemia can result from a wide variety of causes, including pneumonia, chronic obstructive pulmonary disease (COPD), asthma exacerbations, pulmonary embolism, heart failure, and severe trauma. Without supplemental oxygen, sustained hypoxemia can lead to organ dysfunction, brain injury, and death.
Beyond treating acute hypoxemia, medical oxygen is used in numerous other clinical situations. It is a standard component of general anaesthesia, where it is mixed with anaesthetic gases to maintain adequate oxygenation during surgery. In neonatal medicine, carefully titrated oxygen is essential for premature infants with respiratory distress syndrome, though excessive oxygen exposure in neonates carries the risk of retinopathy of prematurity (ROP). Medical oxygen is also used therapeutically for cluster headaches, where high-flow oxygen (12-15 L/min) delivered via a non-rebreather mask can abort acute headache episodes in many patients.
Long-term oxygen therapy (LTOT), typically defined as oxygen use for at least 15 hours per day, has been shown in landmark randomized controlled trials — the Nocturnal Oxygen Therapy Trial (NOTT) and the British Medical Research Council (MRC) study — to improve survival in patients with COPD and chronic hypoxemia. These studies demonstrated a mortality reduction of approximately 30-40% over 2-5 years in patients using long-term oxygen compared to those who did not.
Medical oxygen is different from industrial oxygen. Medical-grade oxygen meets strict pharmaceutical quality standards with controlled purity (minimum 99.5%) and contaminant limits, while industrial oxygen may contain impurities unsuitable for therapeutic use. Always ensure you are using properly labelled medical oxygen for patient care.
Common indications for medical oxygen
- Acute hypoxemia from any cause (pneumonia, pulmonary embolism, heart failure, sepsis)
- Cardiac arrest and resuscitation — high-concentration oxygen during CPR
- Severe asthma exacerbation — to maintain SpO₂ above 94%
- COPD exacerbation — controlled oxygen to target SpO₂ 88-92%
- General anaesthesia — as part of the anaesthetic gas mixture
- Carbon monoxide poisoning — high-flow 100% oxygen to displace CO from haemoglobin
- Cluster headache — high-flow oxygen (12-15 L/min) for acute attacks
- Neonatal respiratory distress — carefully titrated supplemental oxygen
- Long-term oxygen therapy (LTOT) — for chronic hypoxemia in COPD and other conditions
- Palliative care — for symptom relief in terminal illness with hypoxemia
How does medical oxygen work?
When inhaled, medical oxygen increases the partial pressure of oxygen in the alveoli (the tiny air sacs in the lungs). This creates a steeper concentration gradient across the alveolar-capillary membrane, facilitating more efficient diffusion of oxygen into the pulmonary capillary blood. The oxygen molecules bind to haemoglobin in red blood cells (forming oxyhaemoglobin) and also dissolve in plasma, and are then transported via the arterial circulation to all tissues and organs in the body.
The clinical effect of supplemental oxygen is rapid — improvements in arterial oxygen saturation (SpO₂) can be seen within seconds to minutes of initiating therapy. The degree of improvement depends on the underlying cause of hypoxemia, the concentration of oxygen delivered (FiO₂), and the patient's respiratory function. Monitoring with pulse oximetry (and in some cases arterial blood gas analysis) is essential to guide oxygen therapy and ensure appropriate treatment.
What Should You Know Before Using Medicinsk Oxygen Air Liquide?
Medical oxygen is generally very safe when used appropriately with monitoring. The main concern is in patients with chronic CO₂ retention (especially severe COPD), where excessive oxygen can suppress the breathing drive. Oxygen also poses a significant fire hazard and must be kept away from flames and combustible materials.
Although oxygen is a naturally occurring substance essential for life, its therapeutic use requires careful consideration of several factors. When used as a medicine, oxygen should be administered at the lowest concentration needed to achieve the target oxygen saturation. The concept of "more is better" does not apply to oxygen therapy — both too little and too much oxygen can be harmful.
Contraindications
There are no absolute contraindications to the use of medical oxygen when it is clinically indicated. However, there are situations where particular caution is required:
- Paraquat poisoning: High-concentration oxygen may worsen lung injury in paraquat poisoning and should be avoided unless the patient is severely hypoxemic
- Bleomycin exposure: Patients who have received or are receiving bleomycin chemotherapy are at increased risk of oxygen-enhanced pulmonary toxicity, particularly with high FiO₂ during anaesthesia
Warnings and Precautions
The most important clinical concern with medical oxygen is the risk of CO₂ retention in patients with chronic hypercapnic respiratory failure, most commonly seen in severe COPD. These patients may have lost their normal sensitivity to elevated blood CO₂ levels and instead rely on a "hypoxic drive" to stimulate breathing. Administering high-concentration oxygen can abolish this hypoxic drive, leading to a dangerous rise in blood CO₂ (hypercapnia), respiratory depression, and potentially respiratory arrest.
The British Thoracic Society (BTS) Emergency Oxygen Guidelines provide clear recommendations for managing this risk. For patients at risk of CO₂ retention, the target oxygen saturation should be 88-92%, and oxygen should be delivered using a controlled-flow device such as a Venturi mask (24% or 28% FiO₂) or low-flow nasal cannula (1-2 L/min). Arterial blood gas analysis should be performed within 30-60 minutes of initiating oxygen therapy and whenever there is a change in the patient's clinical condition.
Oxygen vigorously supports combustion. Materials that would not normally burn in air may ignite and burn intensely in the presence of oxygen-enriched atmospheres. Never smoke or use open flames near oxygen equipment. Keep oxygen cylinders and delivery equipment away from oils, greases, and petroleum-based products. Ensure adequate ventilation in rooms where oxygen is used.
Additional precautions include:
- Oxygen toxicity: Prolonged exposure to high concentrations of oxygen (FiO₂ above 60% for more than 24 hours) can damage the lungs, causing a condition known as oxygen toxicity or hyperoxic acute lung injury. This manifests as chest pain, cough, and progressively worsening lung function
- Absorption atelectasis: High-concentration oxygen can wash nitrogen out of the alveoli, reducing the "nitrogen splint" that helps keep alveoli open. This can lead to alveolar collapse (atelectasis), particularly in areas of the lung with reduced ventilation
- Retinopathy of prematurity (ROP): In premature neonates, uncontrolled oxygen exposure can cause abnormal blood vessel growth in the retina, potentially leading to vision impairment or blindness. Oxygen saturation in preterm infants must be carefully monitored and kept within recommended target ranges (typically 91-95%)
Pregnancy and Breastfeeding
Medical oxygen is safe to use during pregnancy and breastfeeding when clinically indicated. Indeed, maintaining adequate maternal oxygenation is critical for foetal wellbeing, as the foetus depends entirely on the mother's blood for its oxygen supply. Maternal hypoxemia can cause foetal distress, and oxygen supplementation should not be withheld from pregnant women who need it.
During labour, supplemental oxygen may be administered to the mother if foetal distress is detected, though routine oxygen administration during normal labour is not recommended by current evidence-based guidelines. Oxygen has no known adverse effects on breast milk or breastfeeding.
How Does Medicinsk Oxygen Air Liquide Interact with Other Drugs?
Medical oxygen has relatively few drug interactions, but several medications can increase the risk of oxygen-related lung toxicity. The most clinically significant interactions are with bleomycin, amiodarone, and nitrofurantoin. Additionally, certain sedatives and opioids may require careful oxygen monitoring as they can suppress breathing.
While oxygen is a naturally occurring substance, it can interact with several medications, primarily by enhancing the risk of pulmonary toxicity or by being affected by drugs that alter respiratory drive. Healthcare professionals should be aware of these interactions when prescribing or administering oxygen therapy.
| Drug | Interaction Type | Mechanism | Clinical Significance |
|---|---|---|---|
| Bleomycin | Major | Enhanced pulmonary oxygen toxicity; free radical generation | Avoid high FiO₂ during and after bleomycin treatment; can cause fatal pulmonary fibrosis |
| Amiodarone | Major | Synergistic pulmonary toxicity; phospholipidosis | Increased risk of ARDS; use lowest effective FiO₂ in patients on amiodarone |
| Nitrofurantoin | Moderate | May enhance oxygen-mediated lung injury | Monitor for pulmonary symptoms during concurrent use |
| Opioids (morphine, fentanyl) | Moderate | Respiratory depression may mask hypoxemia | Monitor SpO₂ closely; oxygen may delay detection of respiratory depression |
| Benzodiazepines | Minor | Central respiratory depression | Standard monitoring; adjust oxygen as needed |
| Cyclophosphamide | Moderate | May potentiate pulmonary toxicity | Use caution with high-concentration oxygen in patients who have received cyclophosphamide |
Major Interactions
The interaction between bleomycin and oxygen is one of the most well-documented and clinically dangerous drug interactions in medicine. Bleomycin, a chemotherapy agent used for lymphoma, testicular cancer, and other malignancies, can cause severe pulmonary fibrosis. This risk is dramatically increased when patients are exposed to high concentrations of oxygen, even months or years after bleomycin treatment. The mechanism involves bleomycin-induced generation of free radicals, which are potentiated by elevated oxygen tensions, causing oxidative damage to alveolar epithelial cells. Anaesthetists must be especially vigilant, as even routine surgical oxygen administration can trigger fatal pulmonary complications in bleomycin-treated patients.
Amiodarone, a widely used antiarrhythmic drug, is also associated with an increased risk of pulmonary toxicity when combined with high-concentration oxygen. Amiodarone-induced pulmonary toxicity affects 5-15% of patients on long-term therapy, and high FiO₂ during surgery or intensive care may precipitate or worsen acute respiratory distress syndrome (ARDS) in these patients. The lowest effective oxygen concentration should always be used.
Minor Interactions
Several classes of medication cause respiratory depression that may interact indirectly with oxygen therapy. Opioid analgesics and benzodiazepines suppress respiratory drive, and while supplemental oxygen itself does not worsen this depression, it can mask the clinical signs of hypoventilation by maintaining normal SpO₂ even as respiratory rate and tidal volume fall. This "silent" hypoventilation can lead to dangerous CO₂ accumulation. Close monitoring of both oxygen saturation and respiratory rate is essential when oxygen is used alongside these medications.
What Is the Correct Dosage of Medicinsk Oxygen Air Liquide?
Medical oxygen dosage is individualised based on the patient's condition and target oxygen saturation. The BTS recommends a target SpO₂ of 94-98% for most acutely ill patients, and 88-92% for those at risk of CO₂ retention. Oxygen is delivered at flow rates ranging from 1-2 L/min via nasal cannula to 15 L/min via non-rebreather mask.
Unlike most medications, medical oxygen does not have a fixed dose. Instead, it is titrated to achieve a specific clinical target — usually a desired arterial oxygen saturation measured by pulse oximetry (SpO₂). The appropriate flow rate and delivery device depend on the severity of hypoxemia, the underlying condition, and the patient's individual response. The overarching principle is to use the minimum concentration of oxygen needed to achieve the target saturation.
| Device | Flow Rate | Approximate FiO₂ | Typical Use |
|---|---|---|---|
| Nasal cannula | 1-6 L/min | 24-44% | Mild to moderate hypoxemia; LTOT; COPD |
| Simple face mask | 5-10 L/min | 40-60% | Moderate hypoxemia; post-operative care |
| Venturi mask (24%) | 2-4 L/min | 24% | COPD with CO₂ retention risk |
| Venturi mask (28%) | 4-6 L/min | 28% | COPD with moderate hypoxemia |
| Non-rebreather mask | 10-15 L/min | 60-90% | Severe hypoxemia; emergencies; CO poisoning |
| High-flow nasal oxygen (HFNO) | 30-70 L/min | 21-100% | Acute respiratory failure; pre-intubation |
Adults
Acutely ill adults (general)
Target SpO₂: 94-98%. Start with nasal cannula at 2-6 L/min or simple face mask at 5-10 L/min. Titrate flow rate to achieve and maintain target saturation. If SpO₂ cannot be maintained above 94%, escalate to a higher-flow device. During cardiac arrest, use 100% oxygen via bag-valve-mask or advanced airway.
Adults at risk of CO₂ retention (COPD, severe obesity, neuromuscular disease)
Target SpO₂: 88-92%. Start with a 24% or 28% Venturi mask, or nasal cannula at 1-2 L/min. Check arterial blood gases within 30-60 minutes. If CO₂ levels rise significantly, reduce oxygen flow rate and consider non-invasive ventilation (NIV). Never withhold oxygen from a critically ill patient — instead, titrate carefully.
Long-term oxygen therapy (LTOT)
Typically 1-4 L/min via nasal cannula for at least 15 hours per day. Prescribed after specialist assessment demonstrating resting PaO₂ of 7.3 kPa or below (or 8.0 kPa with evidence of right heart failure, pulmonary hypertension, or secondary polycythaemia). Flow rate is adjusted to maintain SpO₂ above 90% at rest.
Children
Paediatric patients
Target SpO₂: 94-98% (same as adults for most children). In infants and small children, oxygen is often delivered via nasal cannula (0.5-2 L/min), head box, or face mask adapted for paediatric use. Flow rates should be adjusted according to age, size, and clinical response. For neonates, especially preterm infants, lower targets may apply (SpO₂ 91-95%) to reduce the risk of retinopathy of prematurity.
Elderly
Elderly patients
No specific dose adjustment is required for elderly patients beyond the general principles of oxygen therapy. However, elderly patients are more likely to have comorbidities such as COPD, heart failure, and reduced respiratory reserve, so the 88-92% target range should be considered in those with known or suspected chronic CO₂ retention. Regular monitoring and early arterial blood gas assessment are particularly important in this age group.
Missed Dose
The concept of a "missed dose" does not apply to acute oxygen therapy in the same way as for conventional medications. Oxygen is administered continuously as needed and titrated to clinical response. For patients on long-term home oxygen therapy (LTOT), it is important to use oxygen for the prescribed minimum duration (usually at least 15 hours per day, ideally during sleep and rest). If a session is missed or interrupted, simply resume normal use as soon as possible. There is no need to "make up" missed time, but consistent daily use is important for the survival benefit demonstrated in clinical trials.
Overdose
Oxygen "overdose" (hyperoxia) occurs when a patient receives more oxygen than clinically necessary, resulting in supraphysiological oxygen tensions in the blood and tissues. The consequences of hyperoxia include:
- CO₂ narcosis: In susceptible patients (particularly those with severe COPD), excessive oxygen can suppress hypoxic ventilatory drive, leading to progressive CO₂ retention, drowsiness, confusion, and ultimately respiratory failure and coma
- Oxygen toxicity: Prolonged exposure to FiO₂ above 60% causes direct injury to the alveolar epithelium through oxidative stress and free radical generation, leading to inflammation, pulmonary oedema, and fibrosis
- Absorption atelectasis: High FiO₂ washes out nitrogen from alveoli, removing the "splint" that helps keep them open, leading to alveolar collapse
Management of oxygen overdose involves reducing the FiO₂ to the minimum required to maintain the target SpO₂, treating any resulting hypercapnia (potentially with non-invasive ventilation), and supportive care. Prevention through appropriate prescribing and monitoring is far preferable to treating the consequences of hyperoxia.
What Are the Side Effects of Medicinsk Oxygen Air Liquide?
Common side effects of medical oxygen include nasal dryness and irritation, particularly with prolonged use. Serious adverse effects such as oxygen toxicity, CO₂ narcosis, and absorption atelectasis are dose-dependent and primarily associated with high concentrations or prolonged exposure. Most side effects can be prevented with appropriate dose titration and monitoring.
Medical oxygen is generally well tolerated when used at appropriate concentrations and durations. Most side effects are related to the delivery device (nasal cannula irritation, mask discomfort) rather than the oxygen itself. However, at higher concentrations and with prolonged exposure, oxygen can cause significant adverse effects. Understanding these risks is essential for safe prescribing and administration.
Very Common (>1 in 10 patients)
- Dry nose and throat (with nasal cannula use)
- Nasal mucosal irritation
- Skin irritation from mask or cannula contact
Common (1 in 10 to 1 in 100 patients)
- Headache (especially with high-flow devices)
- Feeling of claustrophobia with face mask
- Epistaxis (nosebleeds) with prolonged nasal cannula use
- Mild discomfort or pressure from delivery device
Uncommon (1 in 100 to 1 in 1,000 patients)
- Drowsiness and confusion (in patients with CO₂ retention)
- Nausea
- Chest tightness or substernal discomfort (with high FiO₂)
- Absorption atelectasis (high FiO₂ for extended periods)
Rare (<1 in 1,000 patients)
- Oxygen toxicity / hyperoxic acute lung injury (FiO₂ >60% for >24 hours)
- CO₂ narcosis and respiratory failure (in susceptible patients)
- Retinopathy of prematurity (in preterm neonates)
- Seizures (extremely rare; associated with hyperbaric oxygen therapy)
The risk of side effects can be minimized by following evidence-based guidelines for oxygen prescribing. Key principles include using the lowest effective FiO₂, monitoring SpO₂ regularly, performing arterial blood gas analysis in patients at risk of CO₂ retention, and using humidification for high-flow oxygen delivery to reduce mucosal dryness. For patients on long-term oxygen therapy at home, regular follow-up with healthcare professionals and proper equipment maintenance help ensure safe and effective treatment.
Contact your healthcare provider immediately if you experience increasing drowsiness or confusion while using oxygen, worsening shortness of breath, chest pain, or persistent headache. For patients with COPD using home oxygen, any change in alertness or significant increase in sleepiness should prompt urgent medical review, as this may indicate CO₂ retention.
How Should You Store Medicinsk Oxygen Air Liquide?
Store medical oxygen cylinders upright in a well-ventilated area, away from heat, flames, and combustible materials. Keep at temperatures below 50°C (122°F). Secure cylinders to prevent them from falling. Never use oil or grease on regulators or valves. Follow local fire safety regulations.
Proper storage and handling of medical oxygen is essential for both safety and efficacy. Compressed oxygen is stored under high pressure (typically 137-200 bar) in metal cylinders, and liquid medical oxygen is stored in specialised cryogenic vessels. Incorrect storage poses serious risks, primarily related to fire and explosion hazards. Understanding and following storage guidelines is critical for anyone handling medical oxygen, whether in a hospital, clinic, or home setting.
Storage guidelines
- Temperature: Store at temperatures below 50°C (122°F). Avoid exposure to direct sunlight or proximity to radiators, heaters, or other heat sources
- Ventilation: Store in a well-ventilated area. Oxygen can accumulate in enclosed spaces, creating an oxygen-enriched atmosphere that significantly increases fire risk
- Position: Store cylinders upright and secure them with chains, straps, or stands to prevent them from falling over. A falling cylinder can damage the valve, potentially causing a high-pressure release
- Distance from heat: Keep cylinders at least 1.5 metres (5 feet) from any source of heat or ignition, including pilot lights, stoves, and electrical equipment that may spark
- No smoking: Absolutely no smoking in any room where oxygen is stored or being used. Post clear "No Smoking" and "Oxygen in Use" signs
- Keep clean: Do not use oils, greases, or petroleum-based products on oxygen equipment (regulators, valves, fittings). These substances can ignite spontaneously on contact with high-pressure oxygen
- Separation: Store full and empty cylinders separately and clearly label them. Keep medical oxygen separate from industrial gases
- Access: Ensure cylinders are accessible for emergency use but also secured against unauthorized access or tampering
For patients using home oxygen therapy, additional practical advice includes not draping clothing or blankets over concentrator equipment, keeping oxygen equipment away from curtains and soft furnishings, and having working smoke detectors in the home. Inform your local fire department that oxygen is being used in the home.
Shelf life
Medical oxygen in properly sealed and stored cylinders does not have a traditional expiry date in the way that pharmaceutical tablets or liquids do. The gas itself does not degrade. However, the cylinder and valve must be inspected regularly (typically every 5-10 years depending on local regulations) to ensure structural integrity. Liquid oxygen containers have specific shelf lives related to the evaporation rate and container insulation. Always check the cylinder markings and follow the manufacturer's guidance on inspection and replacement schedules.
What Does Medicinsk Oxygen Air Liquide Contain?
Medicinsk Oxygen Air Liquide contains a single active ingredient: oxygen (O₂) at a concentration of at least 99.5% by volume, meeting European Pharmacopoeia standards. There are no excipients, preservatives, or inactive ingredients.
Unlike most pharmaceutical products, medical oxygen is a single-component product. It contains pure molecular oxygen (O₂) at a minimum concentration of 99.5% v/v, as specified by the European Pharmacopoeia (Ph. Eur.). The remaining fraction (up to 0.5%) may consist of trace amounts of nitrogen, argon, and other atmospheric gases that remain after the manufacturing process.
Active ingredient
- Oxygen (O₂): Minimum 99.5% v/v. Colourless, odourless, tasteless gas. Molecular weight: 32.00 g/mol. Boiling point: -183°C at atmospheric pressure
Purity specifications
The European Pharmacopoeia sets strict limits on contaminants in medical oxygen:
- Carbon monoxide (CO): Not more than 5 ppm (parts per million)
- Carbon dioxide (CO₂): Not more than 300 ppm
- Water vapour: Not more than 67 ppm (equivalent to a dew point of -46°C at atmospheric pressure)
Manufacturing
Medical oxygen is produced industrially by two main processes. Fractional distillation of liquid air (cryogenic air separation) is the most common method for large-scale production: air is cooled to approximately -200°C, liquefied, and then gradually warmed. Because oxygen and nitrogen have different boiling points (-183°C and -196°C respectively), they separate as the liquid air warms, allowing oxygen to be collected at high purity. The second method, pressure swing adsorption (PSA), uses zeolite molecular sieves to selectively adsorb nitrogen from compressed air, producing oxygen at purities typically between 90-96%. PSA systems are commonly used in hospitals for on-site oxygen generation.
Air Liquide Healthcare, the manufacturer of Medicinsk Oxygen Air Liquide, is one of the world's largest producers of medical gases, operating in over 80 countries with a comprehensive quality management system certified to ISO 13485 (medical devices) and GMP (good manufacturing practice) standards.
Frequently Asked Questions
References
- O'Driscoll BR, Howard LS, Earis J, Mak V. British Thoracic Society Guideline for oxygen use in adults in healthcare and emergency settings. BMJ Open Respiratory Research. 2017;4(1):e000170. doi:10.1136/bmjresp-2016-000170
- Continuous or nocturnal oxygen therapy in hypoxemic chronic obstructive lung disease: a clinical trial (Nocturnal Oxygen Therapy Trial Group). Annals of Internal Medicine. 1980;93(3):391-398.
- Long term domiciliary oxygen therapy in chronic hypoxic cor pulmonale complicating chronic bronchitis and emphysema (MRC Working Party). Lancet. 1981;1(8222):681-686.
- Global Initiative for Chronic Obstructive Lung Disease (GOLD). Global Strategy for the Diagnosis, Management, and Prevention of Chronic Obstructive Pulmonary Disease: 2024 Report.
- World Health Organization. WHO Model List of Essential Medicines — 23rd List (2023). Geneva: WHO; 2023.
- European Pharmacopoeia. Monograph: Oxygen (Oxygenium). Council of Europe, Strasbourg.
- Chu DK, Kim LH, Young PJ, et al. Mortality and morbidity in acutely ill adults treated with liberal versus conservative oxygen therapy (IOTA): a systematic review and meta-analysis. Lancet. 2018;391(10131):1693-1705.
- Siemieniuk RAC, Chu DK, Kim LH, et al. Oxygen therapy for acutely ill medical patients: a clinical practice guideline. BMJ. 2018;363:k4169.
- Hardavella G, Karampinis I, Frille A, et al. Oxygen devices and delivery systems. Breathe. 2019;15(3):e108-e116.
- European Medicines Agency (EMA). Summary of Product Characteristics — Medicinal Oxygen.
About the Medical Editorial Team
This article has been written and reviewed by the iMedic Medical Editorial Team, comprising board-certified specialists in respiratory medicine, clinical pharmacology, and emergency medicine. Our team follows international guidelines including BTS, GOLD, WHO, and EMA standards to ensure the highest level of medical accuracy.
Written by medical professionals with expertise in respiratory medicine and pharmacology. All claims are supported by peer-reviewed evidence.
Independently reviewed by the iMedic Medical Review Board. Content follows the GRADE evidence framework with Level 1A evidence where available.
Based on BTS Emergency Oxygen Guidelines 2017, GOLD 2024 Report, WHO Essential Medicines List 2023, and European Pharmacopoeia standards.
No pharmaceutical company funding or sponsorship. Independent editorial content with full transparency about sources and methodology.