Anaphylaxis Management

This treatment is used whenever a patient shows signs of anaphylaxis, regardless of the trigger. The response must begin immediately because the reaction can become fatal within minutes.

• Anaphylaxis triggered by food allergens such as peanuts, tree nuts, shellfish, fish, milk, or eggs.
• Anaphylaxis caused by insect stings, most often from bees or wasps.
• Severe allergic reaction to a medicine, including antibiotics, anti-inflammatory drugs, or contrast dye (the liquid injected before some scans).
• Anaphylaxis during or after latex (natural rubber) exposure, common in healthcare or surgical settings.
• Exercise-induced anaphylaxis, which occurs during or shortly after physical activity, sometimes only when a specific food has also been eaten.

The risks of treating anaphylaxis are far smaller than the risk of leaving a severe reaction untreated, but the medicines and procedures used do carry their own possible side effects.

• Rapid or irregular heartbeat (arrhythmia) after adrenaline injection, which usually settles quickly.
• Temporary rise in blood pressure, which the team monitors continuously.
• Anxiety, trembling, or a feeling of pounding in the chest shortly after adrenaline is given.
• Headache or paleness following adrenaline.
• Fluid overload if large volumes of IV fluids are given, particularly in patients with heart or kidney problems.

Anaphylaxis is an emergency, so there is no planned preparation for the patient before the event itself. What matters is what the patient has already shared with their healthcare team and what emergency tools they carry.

Patients with a known history of severe allergic reactions are usually advised to wear a medical alert bracelet and to carry a prescribed auto-injector (a pre-loaded adrenaline pen) at all times. They are coached by their allergy specialist on when and how to use it before professional help arrives. Knowing your confirmed allergens and keeping that list updated in your medical records helps any emergency team act faster.

If the patient is undergoing a procedure with a known risk of anaphylaxis, such as a contrast-enhanced scan or an allergen immunotherapy session, the clinical team runs checks beforehand. These typically include reviewing allergy history, confirming which medicines the patient takes, and in some cases pre-treating with antihistamines (medicines that reduce the allergic response) or corticosteroids (anti-inflammatory medicines) to lower the chance of a reaction.

Once a reaction begins, the treatment steps unfold in rapid sequence. The order can vary by setting and patient condition, but the general sequence is:

• Recognise anaphylaxis: the team identifies the combination of skin changes, breathing difficulty, and blood pressure drop that defines the emergency.
• Call for help and remove or stop the trigger if possible, for example stopping an infusion or removing a stinger.

After the acute reaction is controlled, the patient stays under observation in a monitored setting because a second wave of symptoms can occur hours later without any new exposure to the trigger.

• Observation period: most hospitals keep patients for several hours after the reaction is controlled, and some cases require an overnight stay depending on how severe the initial episode was.
• Vital sign monitoring: blood pressure, heart rate, and oxygen levels are checked regularly throughout the observation period.
• Oral medicines: antihistamines and corticosteroids are usually continued for a day or more after discharge to dampen any remaining immune response.
• Driving and operating machinery: patients are advised not to drive themselves home given the sedating effect of antihistamines and the physical stress of the event.
• Activity restrictions: strenuous physical activity is typically avoided for at least the first day after a severe episode.

The cost of anaphylaxis management varies widely because the resources needed can range from a single adrenaline injection in a clinic to several days of monitored hospital care with multiple medicines, oxygen support, and specialist involvement.

• Severity and complexity of the reaction: a single episode that resolves quickly with one dose of adrenaline costs far less than a biphasic reaction or one requiring airway intervention and intensive monitoring.
• Length of stay: observation for a few hours in an emergency department, an overnight admission, or an ICU stay each carry a different price.
• Hospital class and country: private hospitals in major international medical travel destinations charge differently from government hospitals, and rates differ significantly between countries.
• Medicines used: adrenaline auto-injectors prescribed for the patient to take home, antihistamines, corticosteroids, and IV fluids each add to the total.
• Oxygen and airway support: use of high-flow oxygen, nebulisers, or in rare cases intubation (placing a breathing tube) adds equipment and clinical fees.