Severe allergy & anaphylaxis
QUICK ANSWER · START HERE
Trouble breathing, throat or tongue swelling, faintness or collapse after an allergen may be anaphylaxis. Use the person’s prescribed epinephrine promptly according to its instructions and seek emergency care. Antihistamines do not replace epinephrine.
Trusted references.
Published references provide deeper context. The practical steps are below; outside references need a connection.
Act on immediate danger. Seek qualified help when reachable and safe, but do not make your first protective step depend on a response. This page is general guidance, not a live alert.
Do now.
- 01
Act on serious symptoms
Breathing trouble, swelling or collapse needs immediate care; a rash is not required. Get the prescribed epinephrine and request emergency assistance.
- 02
Follow the actual device
Assist with prescribed epinephrine according to the label, care plan or dispatcher. Different auto-injectors and nasal products have different instructions. Note the time.
- 03
Keep them accompanied
Use a comfortable position; lie down if showing shock when tolerated. Do not make the person stand or walk.
- 04
Monitor and reassess
If symptoms persist, follow the prescribed plan, product instructions or dispatcher for a repeat dose. If unresponsive and not breathing normally, begin CPR and use an AED.
PLAN AROUND WHAT YOU HAVE
If help is unavailable.
Give prescribed epinephrine without waiting for a callback. Keep requesting urgent care and monitor breathing. Record the dose time and keep the used device for handover. Do not treat improvement as proof that the reaction has ended.
People & practical needs.
Ask caregivers where the prescribed medicine is kept before an outing. Practice with the correct trainer device, explain who will fetch it and who will stay with the person, and check storage and expiry instructions. A school or childcare plan should travel with the child.
Keep essentials within reach
Keep the action checklist and written contact details accessible. Use the equipment named in this guide only when available and appropriate. Assign someone to check access, batteries and expiry dates before an incident; retrieving a kit must not delay the immediate protective action.
Next steps.
Urgent medical assessment is needed after epinephrine, including when symptoms improve. Replace used supplies and review the allergy action plan with a clinician.
No epinephrine available
Request urgent medical assistance immediately, stay with the person and monitor breathing. Do not improvise an injection or medication dose.
A second device is available
Check the person’s action plan and current device instructions. Record each administration separately for the clinician.
Questions in the field.
Can anaphylaxis happen without hives?
Yes. Serious breathing or circulation symptoms after a possible allergen need urgent action even without visible skin changes.
Watch for.
Do not substitute an antihistamine, food or drink for urgent treatment. Avoid a universal device hold-time: follow the product label.
Sources & context.
First-aid summary based on U.S. references. Use the local emergency number; this is not a diagnosis or a substitute for hands-on training.
Osprey Zero combines source-based protective guidance with practical household planning. References provide context, not a promise of assistance. Some standards are U.S.-based; local risks, laws and services differ.
Content updated 2026-10-02. Sources checked 2026-10-02. Next editorial review due 2027-01-02. First-aid summaries support immediate response and training; they have not received independent clinical review.