EpiPen 2 Pak Epinephrine Injection 0.3 mg Auto-Injector for Adults (2 Pack)The EpiPen 2 Pak with Epinephrine Injection 0. 3 mg is used to treat severe allergic reactions, known as anaphylaxis. It is an emergency treatment designed to counteract the effects of allergies to insect stings or bites, foods, medications, and other allergens. The injection works by narrowing blood vessels and opening airways in the lungs, which helps improve breathing, stimulate the heart, and reduce swelling, hives, and other symptoms of an