Answer
A second device provides backup if administration fails or symptoms persist or return before emergency help arrives.
Sources for this answer
- EpiPen Adrenaline (Epinephrine) Auto-Injector 0.3mg — Current selected SmPCemc · Summary of Product Characteristics
- EURneffy 2 mg nasal spray, solution in single-dose container — Current selected SmPCemc · Summary of Product Characteristics
- UK Government