Yes, if you get norepinephrine as an injected medicine, you could have an allergic reaction, trouble breathing, irregular heartbeats, or chest pain. Does epinephrine have side effects? Yes ...

Epinephrine and norepinephrine are naturally made in the body, where they're best known for activating the fight-or-flight response to stress. They both function as hormones and neurotransmitters ...

A potentially ground-breaking nose-spray version of the drug epinephrine will soon hit the ... sometimes life-threatening allergic reaction that comes on quickly with symptoms such as shortness ...