EpiPen and EpiPen Jr Auto-Injectors (generic: epinephrine) are prescription medications used to treat life-threatening allergic reactions in adults and children.  EpiPen contains epinephrine which belongs to a group of drugs called sympathomimetic agents. They relax muscles in the airways and tighten the blood vessels, reversing severely low blood pressure and symptoms of allergic reaction.

This medication comes in an injectable form and is injected in the thigh during a serious allergic reaction.

Common side effects of EpiPen include fast and irregular heartbeat, sweating, and nausea. 

Seek emergency medical attention, even after EpiPen use, to treat severe allergic reactions.