What happens if you use an Epipen without needing it?

The American College of Allergy, Asthma, and Immunology recommends using an EpiPen (generic name: epinephrine) even if you are not sure if it is needed, because the benefits greatly outweigh the risk that you might not need it.

While an EpiPen is a life-saving device for individuals with severe allergies, using it unnecessarily can lead to certain side effects. These side effects typically include:

• Increased heart rate
• Increased blood pressure
• Headache
• Tremors
• Anxiety or nervousness

These side effects of using an EpiPen accidentally are usually temporary and less severe than the consequences of a severe allergic reaction. Some people with certain health problems might be at a higher risk for experiencing more severe side effects (e.g., abnormal heart rhythm, excess fluid in the lungs). Consult with a healthcare professional about when it is appropriate to use an EpiPen.

How soon will I feel the effects after using an EpiPen?

Studies of healthy adults not having an allergic reaction who took a dose of the EpiPen noticed effects 1 minute after using it. This is because unlike oral medication, it is injected directly into a muscle or under the skin.

What does an EpiPen do to a regular person?

If you accidentally use an EpiPen without needing it, your heart rate and blood pressure will go up within minutes. Other side effects you may experience include:

• Anxiety
• Restlessness
• Tremor
• Dizziness
• Sweating
• Headache

Additionally, your thigh might feel sore in the area where you injected the EpiPen. Get medical attention if you notice any side effects that seem severe.

Related questions

• Can you use an expired EpiPen in an emergency?
• Can you bring an EpiPen on a plane?
• What's the mechanism of action for epinephrine?

How long do side effects from EpiPen last?

Most side effects from a dose of EpiPen should go away within a few hours after using it. The effects of the medication typically start to wear off within 30 minutes. In a study of healthy adults who took a dose of the EpiPen, blood pressure returned to normal within 120 minutes. Pain where you injected the medication into your thigh should feel better within a few days.

If you believe you may be having a severe allergic reaction, it is essential to use your EpiPen immediately and seek emergency medical attention.

This is not all the information you need to know about EpiPen (epinephrine) for safe and effective use and does not take the place of your doctor’s directions. Review the full product information and discuss this information and any questions you have with your doctor or other health care provider.