The EpiPen is a trademarked term used to describe a specific brand of epinephrine auto-injectors. However, there are several other brands and generic versions of these devices available that can also be used to treat severe allergic reactions. Some commonly used synonyms for the EpiPen include Auvi-Q, Adrenaclick, and Symjepi. These devices work by delivering a premeasured dose of epinephrine, which helps to constrict blood vessels and open airways, reducing the risk of anaphylaxis. It's important to note that while these devices are similar, they may have different instructions for use, so it's essential to familiarize yourself with your specific auto-injector's instructions.