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Allergic Reactions02:06

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Allergic reactions related to drugs are hypersensitivity responses driven by the immune system and bear no connection to the drug's therapeutic action. While drugs in isolation do not trigger an immune response, they can interact with endogenous proteins to form antigens. These antigens stimulate lymphocytes to produce antibodies. IgE-type antibodies attach themselves to mast cells. Upon subsequent exposure to the same stimulus, the antigen-antibody interaction is initiated, unleashing...
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Hypersensitivity, also known as a hypersensitivity reaction or allergic reaction, is a condition where the body's immune system reacts abnormally to a foreign substance. Such substances, that cause hypersensitivity are referred to as an allergen, could be something typically harmless to most people, like pollen or certain foods.
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Drug binding to proteins is a complex phenomenon influenced by various drug-related factors, each playing a significant role in the interaction between drugs and proteins within the body.
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Updated: Jun 23, 2025

Basophil Activation Test for Allergy Diagnosis
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[Penicillin allergy-Truth or duty?]

Michael Zoller1, Alexandra Weber2, Laurenz Mehringer3

  • 1Klinik für Anästhesiologie, LMU Klinikum der Universität München, Marchioninistr. 15, 81377, München, Deutschland. Michael.Zoller@med.uni-muenchen.de.

Die Anaesthesiologie
|June 21, 2024
PubMed
Summary

Over 95% of patients with reported penicillin allergies test negative, allowing safe reintroduction of beta-lactam antibiotics. Anesthetists can help reduce the burden of false penicillin allergies through careful history taking and risk stratification.

Keywords:
Antibiotic stewardshipBeta-lactam antibioticsDelabelling algorithmPEN-FAST scoreRisk stratification

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Area of Science:

  • Pharmacology
  • Allergy and Immunology
  • Clinical Medicine

Context:

  • Beta-lactam antibiotics, including penicillin, are widely used but often avoided due to reported allergies.
  • A significant number of patients labeled with penicillin allergy do not have a true allergy, leading to the use of alternative, potentially less effective antibiotics.
  • This avoidance contributes to negative clinical outcomes and socioeconomic burdens.

Purpose:

  • To highlight the high prevalence of false penicillin allergies.
  • To emphasize the importance of accurate allergy assessment in antibiotic stewardship.
  • To present a structured algorithm for clarifying beta-lactam antibiotic allergies, particularly penicillin.

Summary:

  • Over 95% of patients reporting penicillin allergy exhibit negative results in allergy testing, indicating a false allergy classification.
  • Accurate identification of true penicillin allergies is crucial for effective antibiotic stewardship.
  • Anesthetists can play a key role in de-labeling penicillin allergy by performing thorough medical histories and risk stratifications.
  • The article proposes a delabeling algorithm for beta-lactam antibiotic allergy, focusing on the PEN-FAST score for structured allergy assessment.

Impact:

  • Reducing the incidence of false penicillin allergies can lead to safer and more effective antibiotic prescribing.
  • Improved antibiotic stewardship through accurate allergy de-labeling can mitigate risks associated with alternative antibiotic use.
  • This approach can decrease the individual and public health burden associated with misclassified penicillin allergies.
  • Facilitating the safe reintroduction of beta-lactam antibiotics can improve patient outcomes and reduce healthcare costs.