Every child with an Adrenaline Auto injector (like Epipen), should have an ‘Allergy Action Plan’. 

http://www.bsaci.org/about/download-paediatric-allergy-action-plans

Also join the Anaphylaxis Campaign at  https://www.anaphylaxis.org.uk/

https://www.allergyuk.org/information-and-advice/conditions-and-symptoms/33-anaphylaxis-and-severe-allergic-reaction

The needle of Epipen (or Jext or Emerade) has to be inserted and held in the muscle for 10 seconds to deliver the drug.