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Penicillin Allergy: Mechanisms, Diagnosis, and Management
Estelle A Green1, Kelan Fogarty1, Faoud T Ishmael2
1Pennsylvania State University, College of Medicine University Park, 1850 East Park Avenue, State College, PA 16803, USA.
The Medical Clinics of North America
|May 30, 2024
Summary
Penicillin allergy involves four types of hypersensitivity reactions, managed by stopping the drug and using medications like epinephrine. Most patients can safely use other beta-lactams, but testing and desensitization are options.
Area of Science:
- Immunology
- Clinical Medicine
- Pharmacology
Background:
- Penicillin allergy is a common adverse drug reaction.
- It manifests through four distinct types of Gell-Coombs hypersensitivity reactions.
- These reactions present with unique clinical and physical findings.
Purpose of the Study:
- To provide a comprehensive overview of penicillin allergy.
- To detail the diagnostic approaches and management strategies.
- To clarify the safety of alternative beta-lactam antibiotics in allergic patients.
Main Methods:
- Review of existing literature on penicillin hypersensitivity.
- Analysis of clinical presentations and diagnostic testing modalities.
- Evaluation of treatment protocols, including discontinuation, supportive care, and desensitization.
Main Results:
- Penicillin allergy encompasses four Gell-Coombs reaction types.
- Management involves drug cessation and symptomatic treatment (epinephrine, antihistamines, glucocorticoids).
- Most beta-lactams are safe, excluding some cephalosporins; testing (skin, patch, graded challenge) guides management.
Conclusions:
- Understanding Gell-Coombs reactions is crucial for diagnosing penicillin allergy.
- Appropriate management includes prompt discontinuation and targeted therapies.
- Careful selection of alternative antibiotics and diagnostic testing ensures patient safety.
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