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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.
Uses For Epipen. Epinephrine injection is used for emergency treatment of severe allergic reactions (including anaphylaxis) to insect bites or stings, medicines, foods, or other substances. It is also used to treat anaphylaxis caused by unknown substances or triggered by exercise.