Practical Answers for Everyday Independence

Responding to an Allergic Reaction or Anaphylaxis

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Category: Health & Safety

Responding to an Allergic Reaction or Anaphylaxis

An allergic reaction occurs when the immune system responds to a substance that is normally harmless to most people. Reactions can range from mild itching or a small area of hives to a life-threatening emergency called anaphylaxis.

Anaphylaxis can affect breathing, circulation, digestion, and the skin. It may develop within minutes, but it can also begin later or become severe after initially mild symptoms.

When anaphylaxis is possible, use prescribed emergency epinephrine immediately and call 911. Do not wait to see whether the reaction improves, and do not rely on an antihistamine to stop it.

Common Allergy Triggers

Possible triggers include:

  • Peanuts and tree nuts
  • Fish and shellfish
  • Milk
  • Eggs
  • Wheat
  • Soy
  • Sesame
  • Insect stings
  • Medications
  • Latex
  • Animal exposure
  • Exercise under certain circumstances
  • Other foods, chemicals, or substances

A severe reaction can sometimes occur without an obvious trigger.

Someone who has tolerated a food, medication, or insect sting in the past may still develop an allergy. A person’s previous reactions also do not reliably predict how severe the next reaction will be.

Recognizing a Mild Allergic Reaction

A mild reaction may cause:

  • Itching in one area
  • A few hives
  • Mild redness
  • Watery or itchy eyes
  • Sneezing
  • A runny nose
  • A small area of swelling around an insect sting
  • Mild skin irritation after contact with something

The person should stop contact with the suspected trigger, follow their allergy action plan, and monitor symptoms closely.

A mild reaction can sometimes become more serious. Continue watching for changes in breathing, swallowing, voice, alertness, swelling, and symptoms affecting other parts of the body.

Recognizing Anaphylaxis

Possible signs of anaphylaxis include:

Breathing and Throat Symptoms

  • Trouble breathing
  • Wheezing
  • Repeated coughing
  • Chest tightness
  • Throat tightness
  • Difficulty swallowing
  • A hoarse or suddenly changed voice
  • Noisy breathing
  • Swelling of the tongue
  • Swelling of the lips, mouth, face, or throat
  • A feeling that the throat is closing

Circulation and Neurological Symptoms

  • Dizziness
  • Fainting
  • Confusion
  • Sudden weakness
  • Pale, blue, gray, or clammy skin
  • A weak or rapid pulse
  • Loss of consciousness
  • A sudden drop in blood pressure
  • A feeling that something terrible is happening

Skin Symptoms

  • Widespread hives
  • Itching
  • Flushing
  • Swelling
  • Skin becoming pale or changing color

Digestive Symptoms

  • Repeated vomiting
  • Severe abdominal cramping
  • Diarrhea
  • Nausea

Anaphylaxis does not always cause hives or another visible skin reaction. A person may have dangerous airway or blood-pressure symptoms without a rash.

Treat the situation as anaphylaxis when a person develops serious breathing, throat, or circulation symptoms after a possible allergen exposure. Symptoms affecting more than one body system—such as hives with vomiting or swelling with dizziness—are also concerning.

Use Epinephrine Immediately

Epinephrine is the first-line emergency treatment for anaphylaxis. It can quickly reduce swelling, support blood pressure, and open the airways.

If the person has prescribed emergency epinephrine and shows signs of anaphylaxis:

  1. Use the epinephrine immediately according to the person’s allergy action plan and the device instructions.
  2. Call 911.
  3. State clearly that the person is having anaphylaxis and has received epinephrine.
  4. Note the time the medication was given.
  5. Stay with the person and monitor breathing and responsiveness.
  6. Use a second prescribed dose if symptoms continue or return and the person’s action plan, device instructions, dispatcher, or healthcare professional directs you to do so.

Do not delay epinephrine while searching for an antihistamine, calling a family member, waiting for a doctor to call back, or deciding whether the reaction is “bad enough.”

The American Academy of Allergy, Asthma & Immunology advises using epinephrine and calling 911 immediately when anaphylaxis is suspected. AAAAI: Anaphylaxis

Follow the Instructions for the Specific Device

Emergency epinephrine is available in different devices, including auto-injectors and prescription nasal products. Instructions vary by brand and formulation.

Before an emergency:

  • Learn how to use the exact prescribed device.
  • Read its instructions.
  • Practice with a trainer device when available.
  • Teach family members, caregivers, coworkers, and school staff.
  • Keep the instructions with the medication.
  • Follow the person’s written allergy action plan.

For an epinephrine auto-injector, the medication is generally delivered into the outer middle thigh. Many devices can be used through clothing, but follow the manufacturer’s instructions.

Do not inject epinephrine into the:

  • Buttocks
  • Hands
  • Fingers
  • Feet
  • Veins

If an auto-injector is accidentally activated into a hand, finger, or another incorrect location, seek immediate medical attention.

A General Auto-Injector Response

Because brands differ, always follow the instructions printed on the device. A general response may involve:

  1. Remove the device from its carrier.
  2. Remove the safety mechanism as instructed.
  3. Place the correct end against the outer middle thigh.
  4. Activate it according to the device instructions.
  5. Hold it in place for the amount of time specified.
  6. Remove it carefully.
  7. Note the time.
  8. Place the used device in a safe location for emergency responders.

Do not place your thumb or fingers over either end of the device. Some auto-injectors have different safety and activation designs.

Emergency responders should be told:

  • Which product was used
  • What dose was given
  • What time it was administered
  • Whether another dose was given
  • What triggered the reaction, if known

Call 911 Even If the Person Feels Better

Epinephrine may improve symptoms quickly, but the person still needs emergency medical evaluation.

Symptoms can:

  • Continue
  • Return
  • Become severe again
  • Require additional medication
  • Affect breathing or blood pressure after initial improvement

A second wave of symptoms is sometimes called a biphasic reaction. It can occur without another exposure to the allergen.

Mayo Clinic advises seeking emergency treatment even when symptoms begin improving because the reaction can return and hospital observation may be necessary. Mayo Clinic: Anaphylaxis—First Aid

Do not allow the person to drive themselves to the hospital.

Position the Person Safely

A sudden drop in blood pressure can occur during anaphylaxis. Standing or walking may make the person collapse.

Unless breathing or another condition makes this position unsafe:

  • Have the person lie flat.
  • Raise the legs slightly.
  • Keep them still.
  • Loosen tight clothing.
  • Keep them comfortably warm.

If the person is having significant difficulty breathing, they may be more comfortable sitting with their legs extended. Do not allow them to stand or walk.

If the person is vomiting or bleeding from the mouth, turn them onto their side to reduce the risk of choking.

A pregnant person should generally lie on their left side when possible.

If the person becomes unconscious but is breathing normally, place them in a safe recovery position when no spinal injury is suspected and you know how to do so.

Follow the 911 dispatcher’s instructions.

If the Person Stops Breathing Normally

If the person becomes unresponsive and is not breathing normally:

  1. Place them on a firm, flat surface.
  2. Begin CPR.
  3. Send someone for an AED if one is available.
  4. Follow instructions from the 911 dispatcher.
  5. Continue until the person begins breathing normally or trained responders take over.

For an untrained bystander who witnesses a teen or adult collapse, Hands-Only CPR involves pushing hard and fast in the center of the chest.

If an AED becomes available, turn it on and follow its spoken instructions.

Do Not Depend on Antihistamines

Antihistamines may help certain mild allergy symptoms, such as itching or hives. They do not adequately treat the dangerous airway swelling, breathing problems, or blood-pressure changes caused by anaphylaxis.

Antihistamines also work more slowly than epinephrine.

Do not substitute an antihistamine for epinephrine. Do not wait for an antihistamine to work before calling 911.

If the person’s allergy action plan includes an antihistamine, it may be given in addition to—not instead of—epinephrine when the person can swallow safely and emergency instructions permit it.

Some antihistamines cause significant drowsiness, which can make it more difficult to monitor changes in alertness.

Do Not Rely on an Asthma Inhaler

A prescribed rescue inhaler may help wheezing caused by asthma, but it does not reverse throat swelling, shock, or the other effects of anaphylaxis.

If the person’s action plan includes both epinephrine and a rescue inhaler, follow the plan. Use epinephrine first when anaphylaxis is suspected.

An inhaler is not a substitute for epinephrine or emergency medical care.

Do Not Give Food or Drink

Do not give food, beverages, pills, or liquid medication to someone who:

  • Has throat or tongue swelling
  • Has difficulty swallowing
  • Is vomiting
  • Is confused
  • Is becoming unconscious
  • Has severe breathing difficulty

They may choke or inhale the material into their lungs.

Remove the Trigger When It Can Be Done Safely

Stop further exposure when possible, but do not delay epinephrine or calling 911.

Examples include:

  • Stop eating the suspected food.
  • Stop an intravenous medication if you are a qualified healthcare professional.
  • Move away from latex exposure.
  • Move away from insects.
  • Remove contaminated clothing when safe.
  • Rinse a substance from the skin when appropriate.

If a honeybee stinger remains in the skin, remove it promptly using a method that does not delay treatment. Do not spend time searching for a stinger when anaphylaxis symptoms are developing.

Do not make someone vomit after eating an allergen.

Allergic Reactions to Insect Stings

A local reaction may cause pain, redness, itching, and swelling around the sting.

For a mild local reaction:

  • Move away from the insect.
  • Remove a visible stinger promptly.
  • Wash the area.
  • Apply a wrapped cold pack.
  • Monitor for symptoms elsewhere in the body.
  • Follow the person’s allergy plan.

Call 911 and use prescribed epinephrine when a sting is followed by:

  • Trouble breathing
  • Throat, tongue, or facial swelling
  • Widespread hives
  • Dizziness or fainting
  • Repeated vomiting
  • Severe abdominal cramping
  • Sudden weakness
  • Symptoms affecting several body systems

Multiple stings can cause serious illness even without an allergy, particularly in children, older adults, and people with heart or breathing conditions. Seek prompt medical advice.

Medication Reactions

Medication allergies may develop after a prescription, nonprescription medicine, injection, or contrast material used for a medical test.

Call 911 for signs of anaphylaxis.

For a nonemergency suspected medication reaction:

  • Stop and seek professional guidance before taking another dose unless stopping the medication would itself be dangerous.
  • Contact the prescribing professional or pharmacist promptly.
  • Record the medication name, dose, time taken, and symptoms.
  • Photograph a visible rash when safe and useful.
  • Keep the medication container.
  • Ask whether an alternative is needed.

Do not label every medication side effect as an allergy. Nausea, headache, or sleepiness may be side effects rather than immune reactions. A healthcare professional can help document the reaction accurately.

Do not take the medication again simply to test whether the reaction returns.

Mild Reactions Still Need Monitoring

When symptoms are mild and limited to one area:

  1. Stop exposure to the suspected allergen.
  2. Follow the person’s allergy action plan.
  3. Contact a healthcare professional or pharmacist when appropriate.
  4. Monitor closely for progression.
  5. Keep prescribed epinephrine nearby.
  6. Be ready to call 911 if symptoms spread or become severe.

A mild reaction may not always remain mild. Breathing problems, throat symptoms, dizziness, fainting, repeated vomiting, or symptoms in several body systems require immediate emergency action.

Children and Anaphylaxis

Children may not be able to describe throat tightness, dizziness, or difficulty breathing clearly.

A child may say:

  • “My tongue feels funny.”
  • “My mouth is itchy.”
  • “There’s something in my throat.”
  • “My chest feels tight.”
  • “I feel weird.”
  • “My stomach hurts.”
  • “I feel like I’m going to fall.”

They may also:

  • Become suddenly quiet
  • Clutch their throat
  • Drool
  • Cough repeatedly
  • Develop a hoarse cry or voice
  • Vomit
  • Become pale or floppy
  • Act frightened or confused

Take unusual statements and sudden behavior changes seriously after a possible allergen exposure.

Follow the child’s emergency allergy plan, use prescribed epinephrine promptly, and call 911.

Preparing for a Known Severe Allergy

Anyone at risk of anaphylaxis should work with a healthcare professional to create a written allergy action plan.

The plan should explain:

  • Known triggers
  • Early symptoms
  • When to use epinephrine
  • How to use the prescribed device
  • When to use a second dose
  • When to call 911
  • Emergency contact information
  • Other medical conditions
  • Additional prescribed medications

Copies may be kept:

  • At home
  • At school
  • At work
  • With caregivers
  • In a travel bag
  • With sports or activity staff
  • With the person’s medication

Make sure the people most likely to be present know where the medication is and how to use it.

Helpful Resources: Browse First Aid Kits for products, equipment, services, or supplies related to this section.

Carrying and Storing Epinephrine

Follow the product’s storage instructions.

General habits include:

  • Carry the number of doses prescribed.
  • Keep the medication accessible.
  • Do not lock it somewhere others cannot reach.
  • Check expiration dates regularly.
  • Refill it before it expires.
  • Protect it from extreme heat and cold.
  • Do not leave it in a hot or freezing car.
  • Inspect the medication according to product directions.
  • Replace damaged or questionable devices.
  • Carry the written action plan.

If the only available device is expired during a life-threatening emergency, follow instructions from the 911 dispatcher or another qualified healthcare professional. Do not delay calling for help.

Eating Away From Home

For a food allergy:

  • Tell restaurant staff clearly about the allergy.
  • Ask about ingredients and preparation.
  • Ask whether cross-contact is possible.
  • Do not rely only on menu labels.
  • Avoid food when the ingredients cannot be confirmed.
  • Carry prescribed epinephrine.
  • Keep emergency information accessible.
  • Teach children not to share food.
  • Read packaged-food labels every time.

Recipes and manufacturing processes can change. A product that was safe previously may have different ingredients later.

Medical Identification

A medical alert bracelet, necklace, phone setting, or wallet card may help responders identify a serious allergy.

Include:

  • The allergen
  • The risk of anaphylaxis
  • Emergency medication information
  • An emergency contact
  • Other important medical conditions

Medical identification supplements an action plan but does not replace carrying epinephrine.

Follow-Up After a Reaction

After emergency treatment:

  • Follow the hospital’s discharge instructions.
  • Replace any epinephrine that was used.
  • Ask whether additional devices are needed.
  • Review the action plan.
  • Schedule follow-up with the regular doctor or allergist.
  • Discuss the likely trigger.
  • Ask whether testing is appropriate.
  • Review avoidance strategies.
  • Inform schools, caregivers, workplaces, and relevant healthcare providers.
  • Update the medication and allergy list.

Write down what happened while the details are fresh, including:

  • What the person was exposed to
  • When symptoms began
  • Which symptoms appeared first
  • When epinephrine was given
  • Whether a second dose was used
  • How long symptoms lasted
  • What treatment was provided

Common Mistakes to Avoid

Try not to:

  • Wait for every possible symptom to appear.
  • Wait to see whether the reaction becomes worse.
  • Use an antihistamine instead of epinephrine.
  • Use an asthma inhaler as the only treatment.
  • Delay calling 911 because epinephrine seems to be working.
  • Make the person stand or walk.
  • Give food or drink to someone with throat or swallowing symptoms.
  • Allow the person to drive.
  • Leave the person alone.
  • Store epinephrine where it cannot be reached quickly.
  • Use an unfamiliar device without checking its instructions.
  • Assume a past mild reaction means future reactions will be mild.
  • Assume anaphylaxis must include hives.
  • Skip emergency evaluation after symptoms improve.
  • Forget to replace a used or expired device.

A Simple Anaphylaxis Checklist

When anaphylaxis may be occurring:

  1. Recognize serious breathing, throat, circulation, digestive, or widespread skin symptoms.
  2. Use prescribed epinephrine immediately.
  3. Call 911.
  4. State that the person is experiencing anaphylaxis.
  5. Note the time epinephrine was given.
  6. Position the person safely and do not let them walk.
  7. Monitor breathing and responsiveness.
  8. Use a second prescribed dose if directed by the action plan or emergency professional.
  9. Begin CPR and use an AED if the person becomes unresponsive and stops breathing normally.
  10. Go to the emergency department even if symptoms improve.
  11. Replace used medication and arrange allergy follow-up.

Anaphylaxis can progress quickly, but prompt epinephrine and emergency care can save a life. When the symptoms suggest a severe reaction, it is safer to act immediately than to wait for certainty.

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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.