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epipenŽ auto-injector -the epipen auto-injector is a disposable drug delivery system featuring spring activation and a concealed needle. it is designed for selfadministration of epinephrine in acute allergic emergencies (anaphylaxis). it provides a rapid, convenient dose of epinephrine for individuals needing protection from potentially fatal allergic reactions. epinephrine by injection is the treatment of choice for anaphylactic reactions because it quickly begins working to reverse symptoms. epinephrine constricts blood vessels, relaxes smooth muscles in the lungs to improve breathing, stimulates the heartbeat, and works to reverse hives and swelling around the face and lips. the effects of epinephrine usually last 10 to 20 minutes. epipen jr auto-injector, 0.15mg.