EpiPen packaging. The box contains an EpiPen adrenaline syringe, which is used for the emergency treatment of anaphylactic shock. This is a type of allergic reaction that can be fatal in minutes. The EpiPen is an auto-injector that can be self- administered. This is the adult version containing 0. 3 milligrams of adrenaline. Common allergens that can trigger anaphylaxis include nuts, seafood and wasp stings. The symptoms of anaphylaxis include local or systemic swelling, a drop in blood pressure and breathing difficulties. People who are susceptible to such attacks should carry adrenaline with them.