What is the active ingredient and dose in EpiPen®?

Each EpiPen® delivers a single dose of 0.3 mg adrenaline injection, and EpiPen® Jr delivers a single dose of 0.15 mg adrenaline. Each vial contains 2 ml adrenaline solution, but the volume administered is in 0.3 ml as approximately 1.7 ml remains in the auto-injector after activation and cannot be used.