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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, a catecholamine secreted by the adrenal gland, is an important CNS neurotransmitter and has a central role in autonomic regulation including intestinal and bronchial smooth muscle tone, vascular tone, glucose metabolism, and cardiac rate and contractility.