An extreme form of an allergic reaction can cause swelling of your mouth and tongue, breathing problems, flushing, collapse and a loss of consciousness. This type of allergic reaction is called anaphylaxis, and it is a medical emergency. Adrenaline is used as a treatment for anaphylaxis. People who have had a severe allergic or anaphylactic reaction in the past are advised to carry an auto-injection device containing adrenaline with them at all times. The injection device is often referred to as an adrenaline pen. It is a pre-filled syringe which is fitted with a needle so that adrenaline can be injected straightway. This means that in the event of a severe reaction occurring again, adrenaline can be self-injected, or injected by a family member or a health worker.
This is a companion discussion topic for the original article at https://patient.info/medicine/adrenaline-epinephrine-for-anaphylaxis-emerade-epipen-jext