• Joshua M Inglis, Gillian E Caughey, William Smith, and Sepehr Shakib.
• Department of Clinical Pharmacology, Royal Adelaide Hospital, Adelaide, South Australia, Australia.
• Intern Med J. 2017 Nov 1; 47 (11): 1292-1297.

BackgroundThe majority of patients with penicillin allergy labels tolerate penicillins. Inappropriate avoidance of penicillin is associated with increased hospitalisation, infections and healthcare costs.AimsTo examine the documentation of penicillin adverse drug reactions (ADR) in a large-scale hospital-based electronic health record.MethodsPenicillin ADR were extracted from 96 708 patient records in the Enterprise Patient Administration System in South Australia. Expert criteria were used to determine consistency of ADR entry and suitability for further evaluation.ResultsOf 43 011 unique ADR reports, there were 5023 ADR to penicillins with most being entered as allergy (n = 4773, 95.0%) rather than intolerance (n = 250, 5.0%). A significant proportion did not include a reaction description (n = 1052, 20.9%). Using pre-set criteria, 10.1% of reports entered as allergy had a reaction description that was consistent with intolerance and 31.0% of the entered intolerances had descriptions consistent with allergy. Virtually all ADR (n = 4979, 99.1%) were appropriate for further evaluation by history taking or immunological testing and half (50.7%, n = 2549) had documented reactions suggesting low-risk of penicillin allergy.ConclusionThe frequency of penicillin allergy label in this data set is consistent with the known overdiagnosis of penicillin allergy in the hospital population. ADR documentation was poor with incomplete entries and inconsistent categorisation. The concepts of allergy and intolerance for ADR classification, whilst mechanistically valid, may not be useful at the point of ADR entry by generalist clinicians. Systematic evaluation of reported ADR is needed to improve the quality of information for future prescribers.© 2017 Royal Australasian College of Physicians.

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