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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.
EpiPen Â®Jr. is a prescription of epinephrine in a lightweight âpen.â The pen contains one dose (.15 mg) of epinephrine for a child. The EpiPenÂ® is the prescription for older children and adults. Once your child is approximately 60 pounds, you will probably receive a prescription for an EpiPenÂ® rather than the Jr.