Characteristics of Drug Hypersensitivity Reactions in Children: A Retrospective Analysis in an Allergy Outpatient Clinic

Objective: Confirmation of drug hypersensitivity reactions (DHRs) is crucial—as various nonallergic reactions, such as viral infections, in children can mimic such reactions. This study aimed to evaluate the characteristics of children with suspected DHRs applying to an allergy outpatient clinic. Material and Methods: This study involved children who visited our hospital’s pediatric allergy outpatient clinic between April 1 and December 31, 2023, with suspected DHRs . The data of patients analyzed retrospectively. Patient demographics, reaction characteristics, culprit drugs, diagnostic procedures (including skin and/or provocation tests), and final diagnoses were recorded. Results: The study included 163 reactions of 140 patients with 176 suspected drugs. The median age was 7.7 years (interquartile range [IQR]; 5.1–12 years), with an equal gender distribution. Notably, 27.1% of the patients presented with concurrent atopic diseases. The median age at the onset of reaction was 72 months (IQR; 34.5–108 months), with 16% of reactions occurring within hospital settings and the remainder at home. Oral administration accounted for 84.7% of the reactions, with antibiotics being the most common culprit drug group (75.5%). Immediate reactions constituted 41.1% (n = 67) of reactions, while delayed reactions accounted for 58.9% (n = 96). Skin symptoms were predominant (97.5%). DHRs were excluded in 75.5% (n = 123) of reactions but confirmed by diagnostic drug allergy tests in 4.9% (n = 8). Conclusion: A through evaluation of suspected DHRs in children is essential. Despite high suspicion rates, confirmation via diagnostic tests was low, emphasizing the need for referral to specialized clinics and appropriate diagnostics for accurate management.