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An EpiPenÂ® is an autoinjector which delivers a carefully metered dose of epinephrine intramuscularly via a spring-loaded needle. This device is designed to be used in the emergency treatment of severe allergic reactions.
An EpiPen is an epinephrine auto-injector used to treat a severe allergic reaction called anaphylaxis. Anaphylaxis is potentially fatal and is considered a treat first, then call for help medical emergency. Epinephrine is a synthetic version of naturally occurring adrenaline created by the body.