Lee Noimark is a paediatric allergist at the Royal London Hospital.  He and his team put these allergy action plans together.  Print them out for your patients to give to nursery or school in the event of an allergic reaction.  The labels are self explanatory:

Allergy Action Plan (mild-moderate)

Allergy Action Plan (mild-moderate with asthma)

Allergy Action Plan (severe)

Allergy Action Plan (severe with asthma)