EpiPen(TM) is the most common brand of epinephrine, or adrenaline, autoinjector. It is used to self-treat anaphylactic shock. They are carried by people with known severe allergies. The design of the EpiPen is simple. The dosage of epinephrine, 0.3 milligrams for adults and 0.15 milligrams for children, is kept in a durable tube with a spring-loaded needle on the end. When the tube is jammed into the thigh, the needle pokes through a protective membrane to deliver the medication into the patient's system.