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Stacy Wiegman, PharmD, Pharmacy, answeredEpiPen is a brand name for an automatic injection device that delivers a dose epinephrine. This is used to treat allergic reactions to insect bites, foods, latex or other products that are severe enough to be life-threatening (like anaphylaxis). Symptoms of these allergic reactions include: trouble breathing, swelling, low blood pressure and rash. Epinephrine works by narrowing blood vessels and relaxing the airways, and is part of a class of drugs called sympathomimetic agents.