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How long does an EpiPen last once activated?

April 5, 2026

Quick Answer

An EpiPen lasts for 20 minutes once activated. This is the duration after which the medication will start to degrade.

Understanding EpiPen Expiration

When an EpiPen is activated, the expiration time starts. According to the manufacturer, EpiPen’s expiration time is 20 minutes. However, this time frame can vary depending on the individual’s condition and the presence of any underlying medical conditions.

EpiPen Dose and Dosage

A single EpiPen contains 0.3 milligrams of epinephrine, which is the standard dose for adults and children over 30 pounds. For children weighing between 15 and 30 pounds, a 0.15 milligram dose is recommended. It is essential to note that an EpiPen is designed to be used as a temporary measure until further medical help arrives.

Post-EpiPen Care

After administering an EpiPen, it is crucial to call emergency services. The individual should also be placed in a comfortable position, preferably on their back, to prevent choking. The person should be kept calm and awake, and any signs of anaphylaxis should be monitored closely.

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