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EpiPen injection. Uses. This medication is used in emergencies to treat very serious allergic reactions to insect stings/bites, foods, drugs, or other substances. Epinephrine acts quickly to improve breathing, stimulate the heart, raise a dropping blood pressure, reverse hives, and reduce swelling of the face, lips, and throat.
However, if the victim of a spider bite (or any other sting or bite) begins showing signs of severe allergic reaction, such as breathing difficulty/wheezing, hives, or severe weakness or tiredness, call 911 immediately and make sure the victimâs epinephrine pen is ready for use.