EpiPens are a type of epinephrine auto-injector. These are life-saving devices that provide a rapid injection of epinephrine, a synthetic form of adrenaline.
Epinephrine can reverse the symptoms of anaphylaxis — a severe allergic reaction that can be life threatening.
What allergies need an EpiPen?

EpiPens help manage anaphylaxis, which a large variety of allergens can trigger.
According to the EpiPen prescribing information document, you can use these injections for anaphylaxis resulting from any allergen, including:
- Food allergies, such as peanuts, tree nuts, shellfish, and eggs
- Insect stings and bites, such as bees, wasps, fire ants, and mosquitoes
- Medications, such as antibiotics, nonsteroidal anti-inflammatory drugs (NSAIDs), and color injections used for radiology testing
- Other allergies, such as latex or exercise-induced symptoms
Does an EpiPen work for any allergy?
EpiPens work by providing immediate relief from severe allergic reactions. They do not treat the underlying allergy.
This means that EpiPens are not allergy-specific. You can use an EpiPen to treat anaphylaxis no matter the cause of it.
How does an EpiPen work?
EpiPens contain a pre-measured dose of epinephrine, a hormone that affects alpha- and beta-adrenergic receptors in your body. This quickly causes a range of effects to manage acute allergic reactions, including:
- narrowing of blood vessels to prevent a drop in blood pressure
- expansion of the airways to make it easier to breathe
- relief of itching and swelling
- relaxation of smooth muscles in the stomach, intestines, uterus, and bladder to prevent digestive and urinary symptoms
EpiPens are not a substitute for allergy management. They are a temporary emergency measure to stabilize the situation until medical help arrives.
Is an EpiPen the same as Benadryl?
No, an EpiPen is not the same as Benadryl (diphenhydramine).
Benadryl is an antihistamine that can help relieve mild to moderate allergy symptoms, such as itching and hives.
While it can be a useful addition to allergy management, it is not a substitute for an EpiPen in cases of severe allergic reactions.
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When should you use an EpiPen?
You should use an EpiPen on yourself or someone else for symptoms of a severe allergic reaction. Timely use can be life-saving.
The American Academy of Allergy, Asthma & Immunology explains that these symptoms of anaphylaxis can occur within minutes after exposure to the allergen.
Skin symptoms
- flushing or redness
- rash or hives
- itching
- swelling of the eyes and lips
Breathing symptoms
- trouble breathing
- wheezing
- chest or throat tightness
- hoarse voice or difficulty talking
Circulation symptoms
- rapid heart rate or weak pulse
- fainting
- paleness
- blue color
Additional symptoms
- difficulty swallowing or drooling
- a feeling of unease, anxiety, or fear
- vomiting
- diarrhea
- stomach cramps
If you or someone else is experiencing these symptoms, immediately administer an EpiPen or other type of epinephrine auto-injector, then call 911 for emergency medical attention.
How do you use an EpiPen?
Using an EpiPen is relatively straightforward, but it’s best to familiarize yourself with the process before you need it.
You can view a video guide on the EpiPen website here.
For people with the potential for anaphylaxis, doctors recommend carrying two EpiPens or similar epinephrine auto-injectors with you at all times. This is in case the first injector does not work properly or if the person with symptoms does not respond to the first shot.
Here are the general steps:
- Check the EpiPen: Check that the medication is clear, there is no damage to the auto-injector, and the blue safety cap is not raised.
- Prepare the EpiPen: Remove the injector from the protective case and take off the blue safety cap. Hold the EpiPen firmly in your hand, with the orange tip pointing downward.
- Prepare to inject: Place the orange needle end against the outer thigh — you may use it through clothing if necessary. If administering to a young child, hold them firmly in place.
- Inject the medication: Push down firmly and hold for 3 seconds. Listen for a pop sound, which means the EpiPen has successfully and automatically injected the epinephrine. After the pop, hold down for another 3 seconds.
- Remove the EpiPen: Lift the auto-injector straight out from the thigh.
After using the EpiPen, call 911 for emergency medical attention, even if the symptoms improve.
If the symptoms do not improve or return, you can use a second EpiPen.