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EpiPen is an injection that contains epinephrine, a chemical that narrows blood vessels and opens airways in the lungs. EpiPens have become a necessity for families with children suffering from severe allergies to counter effects like wheezing, uneven breathing, increased or decreased heart rate, swelling and other potentially fatal reactions.
Epinephrine. Epinephrine, also known as adrenaline, is an excitatory neurotransmitter. It is derived from norepinephrine and is secreted along with norepinephrine in response to fear or anger. This reaction, referred to as the âfight or flightâ response, prepares the body for strenuous activity.