Updated January 26, 2015.

Definition:

Epinephrine, also known as adrenalin, is a naturally occurring hormone that makes the heart pump harder, increases blood pressure, and opens airways in the lungs. It is prescribed in medication form as emergency treatment for severe allergic reactions (anaphylaxis) to food, insect stings, or latex.

Epinephrine will temporarily halt or improve the symptoms of anaphylaxis, long enough to call 911 and get to the nearest hospital.

An epinephrine auto-injector, commonly referred to by the brand name Epi-Pen, is a prefilled synringe designed to be self-injected into your outer thigh.

There are three brands of epinephrine auto-injectors prescribed in the United States: Epi-Pen, Twinject, and Adrenaclick. There is also a generic version of the drug. Each has slightly different directions for use.

Pronunciation: EHP-ih-NEHFF-rihn Ah-Tow in-JECT-or

Also Known As: Epi-Pen, Twinject, Generic Epinephrine Auto-Injector, Adrenaclick, adrenalin, auto-injector