Epinephrine is the drug form of a hormone, adrenaline, that your body makes on its own. Epinephrine auto-injectors are devices that have been designed for use by non-medical people. They contain a pre-measured amount of epinephrine that is to be used to treat an anaphylactic reaction. When the device is injected into the muscle of the mid-outer thigh, the epinephrine enters the body, and helps to reverse the effects of an anaphylactic reaction. Epinephrine opens up the airways to improve breathing and blood flow when there is a drop in blood pressure. You should give epinephrine at the start of an anaphylactic reaction, even before calling 9-1-1. If given unnecessarily, epinephrine will not harm healthy people. If you are in an emergency situation, and are nervous or scared about using the auto-injector, take a few seconds to read the instructions on the auto-injector first, before using it. It’s worth the time to do this in order to give the device properly.