Practical Answers for Everyday Independence

Responding to an Allergic Reaction or Anaphylaxis – QG

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Category: Health & Safety

⚡ Responding to an Allergic Reaction or Anaphylaxis

An allergic reaction occurs when the immune system overreacts to a substance such as food, medication, insect venom, latex, or another allergen.

Anaphylaxis is a severe, rapidly developing allergic reaction that can interfere with breathing or circulation. It is life-threatening and requires immediate epinephrine and emergency medical care.

Signs of a Mild Allergic Reaction

A mild reaction may cause:

  • Limited itching
  • A small area of hives
  • Mild redness
  • Watery or itchy eyes
  • Sneezing
  • Mild swelling at an insect-sting site
  • Mild nasal congestion

Monitor the person closely. A mild reaction can sometimes progress into anaphylaxis.

Follow the person’s allergy action plan and contact a healthcare professional for guidance.

Signs of Anaphylaxis

Call 911 and use epinephrine immediately if the person develops:

  • Difficulty breathing
  • Wheezing
  • Repeated coughing
  • Throat tightness
  • Trouble swallowing
  • A hoarse or changed voice
  • Swelling of the lips, tongue, face, or throat
  • Widespread hives
  • Severe itching or flushing
  • Repeated vomiting
  • Severe abdominal cramps
  • Dizziness
  • Confusion
  • Fainting
  • Weak or rapid pulse
  • Blue, gray, or extremely pale lips or skin
  • A feeling that something is seriously wrong
  • Symptoms involving more than one body system after possible allergen exposure

Anaphylaxis can occur without hives or a visible rash. Do not wait for skin symptoms before acting.

Use Epinephrine Immediately

If the person has a prescribed epinephrine auto-injector or nasal epinephrine product:

  1. Use it immediately according to the device instructions.
  2. Call 911.
  3. Note the time it was given.
  4. Stay with the person.
  5. Monitor breathing and responsiveness.
  6. Give a second dose according to the person’s action plan, product directions, or emergency instructions if symptoms continue or return and another dose is available.

Do not delay epinephrine while waiting to see whether symptoms worsen.

If you are unsure whether symptoms are severe enough, use the person’s allergy action plan and call 911. Delaying epinephrine is generally more dangerous than using it promptly during suspected anaphylaxis.

Using an Epinephrine Auto-Injector

Devices vary. Follow the instructions printed on the specific product.

In general:

  • Remove the safety cap as directed.
  • Keep fingers away from the needle end.
  • Place the correct end against the outer middle thigh.
  • Activate the device as instructed.
  • Hold it in place for the time stated on the label.
  • Note the time.
  • Give the used device to emergency responders.

Many auto-injectors can be used through clothing when necessary, but avoid seams, pockets, and bulky items.

Do not inject epinephrine into the hands, feet, buttocks, or a vein.

Position the Person Safely

If the person feels faint or weak:

  • Have them lie flat with their legs raised when possible.
  • Do not allow them to stand or walk.

If breathing is easier while sitting:

  • Let them sit upright with their legs extended.
  • Do not force them to lie flat.

If the person is vomiting or unconscious but breathing:

  • Place them on their side when no serious spinal injury is suspected.

If the person is pregnant:

  • Position them on their left side when possible.

Sudden standing can cause a dangerous drop in blood pressure.

If the Person Stops Breathing Normally

  • Call 911 if no one has called.
  • Begin CPR.
  • Send someone to get an AED.
  • Use the AED as soon as it arrives.
  • Continue until the person begins breathing normally or emergency professionals take over.

Gasping is not normal breathing.

Antihistamines Are Not a Substitute for Epinephrine

An antihistamine may help mild itching or hives, but it does not quickly treat:

  • Throat swelling
  • Breathing difficulty
  • Low blood pressure
  • Shock
  • Other life-threatening features of anaphylaxis

Do not delay epinephrine while waiting for an antihistamine to work.

An asthma rescue inhaler may help wheezing but does not replace epinephrine during anaphylaxis.

Remove the Trigger When Possible

Only if it can be done safely and without delaying epinephrine:

  • Stop an intravenous medication.
  • Move away from the allergen.
  • Remove a visible insect stinger.
  • Rinse an allergen from the skin.
  • Remove contaminated clothing.

Do not make someone vomit after swallowing an allergen.

For a honeybee sting, remove the stinger promptly by scraping or gently pulling it out. The speed of removal is more important than the exact technique.

Symptoms Can Return

A second reaction can occur after the person appears to recover. This is sometimes called a biphasic reaction.

The person needs emergency medical evaluation after epinephrine, even when:

  • Breathing improves.
  • Hives disappear.
  • Swelling decreases.
  • The person says they feel normal.
  • The suspected trigger is no longer present.

Do not allow the person to drive themselves.

If No Epinephrine Is Available

  • Call 911 immediately.
  • Tell the dispatcher that anaphylaxis is suspected.
  • Keep the person in the safest position.
  • Send someone to locate epinephrine if available nearby.
  • Monitor breathing.
  • Be prepared to begin CPR.
  • Follow the dispatcher’s instructions.

Do not rely on antihistamines, water, food, or home remedies.

After the Emergency

The person should:

  • Replace any used epinephrine.
  • Check the expiration dates of remaining devices.
  • Store epinephrine according to its instructions.
  • Carry the recommended number of doses.
  • Review the allergy action plan.
  • Discuss the reaction with an allergist or other healthcare professional.
  • Consider medical identification.
  • Teach family, friends, coworkers, and caregivers how to help.
  • Keep epinephrine accessible rather than locked away or left in a vehicle.

Epinephrine should be protected from extreme heat, freezing temperatures, and direct sunlight.

Preventing Future Reactions

  • Read food and medication labels.
  • Ask about ingredients.
  • Prevent cross-contact with known food allergens.
  • Tell healthcare professionals about allergies.
  • Check medication before taking it.
  • Wear medical identification when appropriate.
  • Carry epinephrine at all times.
  • Inform schools, workplaces, caregivers, and travel companions.
  • Maintain a written allergy action plan.
  • Check devices regularly.

Do not assume that a previous mild reaction means the next reaction will also be mild.

Quick Anaphylaxis Checklist

  • Recognize breathing problems, throat swelling, fainting, or symptoms involving multiple body systems.
  • Use epinephrine immediately.
  • Call 911.
  • Note when epinephrine was given.
  • Keep the person lying down unless breathing is easier while sitting.
  • Do not allow walking or standing.
  • Give a second dose when directed if symptoms continue.
  • Do not substitute an antihistamine or inhaler for epinephrine.
  • Begin CPR if breathing is not normal.
  • Obtain emergency evaluation even if symptoms improve.

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Important Health & Safety Notice

The information in this guide is provided for general educational purposes only. Independence Answers is not a medical provider, and this content is not a substitute for professional medical advice, diagnosis, treatment, or supervision. Always follow the instructions of your doctor, pharmacist, or other qualified healthcare professional, especially if you have a medical condition, take medication, or are unsure whether an action is safe for you.

Do not ignore or delay seeking professional care because of something you read here. If you believe someone may be experiencing a serious or life-threatening emergency, call 911 or your local emergency number immediately.