Final answer:
Epinephrine auto-injectors, like the EpiPen, are used to treat anaphylaxis, a severe allergic reaction. Indications for using an EpiPen include a drop in blood pressure, changes in heart rate, and difficulty breathing. The epinephrine in the EpiPen helps control the immune reaction.
Step-by-step explanation:
Epinephrine auto-injectors, such as the EpiPen, are used to treat severe allergic reactions known as anaphylaxis. Anaphylaxis is a life-threatening response caused by the release of histamines. The indications to use an EpiPen include a drop in blood pressure, changes in heart rate, difficulty breathing, and swelling of the tongue and throat. The epinephrine in the EpiPen helps to control the immune reaction and can save lives.