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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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Post-marketing surveillance is a critical component of pharmaceutical regulation, often uncovering unanticipated adverse drug reactions (ADRs) once a drug is widely used over an extended period.
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Antibiotic resistance is a major public health concern that arises when bacteria evolve mechanisms to withstand the effects of antibiotic treatments. This resistance can be intrinsic, acquired through genetic mutations, or transferred between bacteria via horizontal gene transfer. The development of antibiotic resistance poses significant challenges in treating bacterial infections and necessitates ongoing research to develop new therapeutic strategies.Intrinsic resistance occurs when bacterial...
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Related Experiment Video

Updated: Dec 28, 2025

Basophil Activation Test for Allergy Diagnosis
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Update on penicillin allergy delabeling.

Marcus Shaker1,2, Samuel McWilliams1,2, Matthew Greenhawt3

  • 1The Geisel School of Medicine at Dartmouth, Hanover.

Current Opinion in Pediatrics
|February 19, 2020
PubMed
Summary
This summary is machine-generated.

Penicillin allergy delabeling safely removes the label for many patients, improving antibiotic choices and outcomes. Direct oral challenges are effective for low-risk patients, while higher-risk individuals require further allergy evaluation.

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Area of Science:

  • Clinical Immunology
  • Infectious Diseases
  • Dermatology

Background:

  • Penicillin allergy labels lead to suboptimal antibiotic use, contributing to antibiotic resistance and poorer patient health outcomes.
  • While 10% of the population is labeled penicillin-allergic, severe penicillin anaphylaxis is rare (less than 1%).

Purpose of the Study:

  • To review current strategies for phenotyping and risk classification of penicillin allergy.
  • To provide an update on penicillin allergy delabeling approaches suitable for primary care settings.

Main Methods:

  • Review of existing literature on penicillin allergy diagnosis and delabeling.
  • Analysis of risk stratification for different types of penicillin-related adverse reactions.
  • Evaluation of direct oral challenge and allergy testing protocols.

Main Results:

  • Direct oral challenge is a safe and effective delabeling strategy for patients with a history of delayed, benign skin rashes attributed to beta-lactams over 12 months prior.
  • Immediate reactions during oral challenge occur in less than 5% of low-risk patients; delayed reactions are infrequent.
  • Patients with immediate urticaria, IgE-mediated symptoms, or anaphylaxis require comprehensive allergy evaluation, including penicillin skin testing.

Conclusions:

  • Penicillin allergy delabeling is a valuable service that can be successfully implemented.
  • A multidisciplinary, collaborative approach is key to effective penicillin allergy delabeling in primary care.