Box 1.

Patient and medical information captured on PICS for each inpatient episode with a documented allergy

Patient demographics	Age
	Sex
	Ethnicity
	Weight
	Post-code
Allergies	Drug name
Medical history	Number of documented comorbidities
	Number of previous admissions to the Trust: atopic history: asthma (ICD10; J45), conjunctivitis (H10), eczema (B00.0) and atopic dermatitis (L20), dermatitis (L23–L27), rhinitis (J30), psoriasis (L40 & L41)
	Psychological comorbidities: schizophrenia and other psychoses (F20–F29); affective disorders (F30–F39); neuroses stress-related and somatoform disorders (F40–F48); behavioural and personality disorders (F90–F98); other organic disorders (F00–F09)
Drug history	Presence of a prescription for:
	Antihistamines
	Adrenaline 1:1,000 (or preparations of this such as Epipen®)
	Corticosteroids: prednisolone, hydrocortisone