How common is anaphylaxis?

Anaphylaxis or anaphylactic shock is very common. It is the typical allergic reaction that people have when they come in any kind of contact with an allergen. Usually, they have difficulty breathing, parts or all their body starts to swell up,...

They usually have an Epipen or a Twinject on them and they contain epinephrine, a drug used for anaphylactic shock.