Risk Assessment of Patients with a History of Penicillin Allergy Using the PEN-FAST Tool for Drug Delabeling in a Tertiary Care Hospital

Authors

  • Jantima Yothapitak Pharmacy Department, Suratthani Hospital
  • Piyaporn Jaisue Pharmacy Department, Suratthani Hospital
  • Pawichwadee Molee Pharmacy Department, Suratthani Hospital

Keywords:

drug delabeling, history of penicillin allergy

Abstract

Background: Patients with a documented penicillin allergy in hospital electronic medical records are labeled to prevent re-exposure; however, some may not be truly allergic. Evidence regarding the extent of false allergy labeling remains limited, even though such mislabeling can influence antibiotic prescribing practices and increase healthcare costs.

Objectives: To assess the prevalence and associated factors of patients with a recorded history of penicillin allergy who are suitable for referral to a drug delabeling process.

Methods: This retrospective analytical study included all patients with a recorded history of penicillin allergy in the hospital electronic medical record system between January 1, 2024, and December 31, 2024. Demographic data and allergy-related information were collected and evaluated using the PEN-FAST tool to determine patients’ risk levels for entering the drug delabeling process. The prevalence of low-risk patients unlikely to have a true allergy upon testing, as well as factors associated with the risk levels, were analyzed using logistic regression.

Results: Among 559 patients with a documented history of penicillin allergy, 123 (22.0%) had a PEN-FAST score < 3, indicating a low risk of a positive penicillin allergy test and suitability for drug delabeling. None of the demographic factors (gender, age) or clinical factors (allergy-related diseases, multiple drug allergies, patient-reported information, or documentation by healthcare personnel during allergic reactions) were significantly associated with the risk level for drug delabeling (p-value > 0.05).

Conclusion: According to the PEN-FAST assessment criteria, 22% of patients with a history of penicillin allergy were eligible to undergo an appropriate drug allergy testing. No factors demonstrated a statistically significant association (p-value > 0.05) with the risk level for proceeding with allergy de-labeling.

Author Biographies

Jantima Yothapitak, Pharmacy Department, Suratthani Hospital

BCP (Pharmacotherapy)

Piyaporn Jaisue, Pharmacy Department, Suratthani Hospital

M.Pharm (Clinical Pharmacy)

Pawichwadee Molee, Pharmacy Department, Suratthani Hospital

Pharm.D. (Pharmaceutical Care)

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Published

2025-12-25

How to Cite

1.
โยธาพิทักษ์ จ, ใจซื่อ ป, โมฬี ป. Risk Assessment of Patients with a History of Penicillin Allergy Using the PEN-FAST Tool for Drug Delabeling in a Tertiary Care Hospital. Thai J Clin Pharm [Internet]. 2025Dec.25 [cited 2026Jan.10];31(3):215-28. Available from: https://thaidj.org/index.php/TJCP/article/view/17141