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Related Concept Videos

Factors Affecting Drug Response: Overview01:21

Factors Affecting Drug Response: Overview

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When it comes to infants and young children, they are typically administered smaller doses of medication in comparison to adults. This is primarily because their organ functions still need to fully develop, meaning their bodies are not as efficient at metabolizing or eliminating drugs. Additionally, their blood-brain barrier is more permeable than in adults. As a result, high concentrations of drugs can easily penetrate the central nervous system (CNS), potentially leading to neurological...
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Hypersensitivities01:30

Hypersensitivities

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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.
Types of Hypersensitivities
Hypersensitivity reactions are categorized into four types: Type 1, Type 2, Type 3, and Type 4. Each type has a distinct mechanism...
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Allergic Drug Reactions01:27

Allergic Drug Reactions

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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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Updated: Jun 21, 2025

Precision Implementation of Minimal Erythema Dose MED Testing to Assess Individual Variation in Human Inflammatory Response
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Delayed Skin Testing for Systemic Medications: Helpful or Not?

Annick Barbaud1, Margarida Goncalo2, Maja Mockenhaupt3

  • 1Sorbonne Université, INSERM, Institut Pierre Louis d'Epidémiologie et de Santé Publique, AP-HP.Sorbonne Université, Hôpital Tenon, Département de dermatologie et allergologie, Paris, France.

The Journal of Allergy and Clinical Immunology. in Practice
|July 8, 2024
PubMed
Summary
This summary is machine-generated.

Severe cutaneous adverse reactions (SCARs) require lifelong avoidance, unlike morbilliform drug eruptions. This review assesses delayed skin testing for diagnosing SCARs, crucial for drug safety and patient management.

Keywords:
DRESSDrug patch testsIntradermal testsMaculopapular exanthemaPrick tests

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Area of Science:

  • Allergy and Immunology
  • Dermatology
  • Pharmacovigilance

Background:

  • Cutaneous adverse drug reactions (ADRs) encompass morbilliform eruptions and severe cutaneous adverse reactions (SCARs).
  • SCARs, including Stevens-Johnson syndrome and toxic epidermal necrolysis, are T-cell mediated with lasting immunity, necessitating strict drug avoidance.
  • Current diagnostic methods for SCARs lack 100% negative predictive value, posing challenges for drug safety.

Purpose of the Study:

  • To review and critically evaluate the utility of delayed skin testing for diagnosing delayed hypersensitivity reactions to drugs.
  • To assess the evidence base for patch testing and delayed prick/intradermal testing in various clinical phenotypes of SCARs.
  • To address controversies surrounding diagnostic approaches for cutaneous adverse drug reactions.

Main Methods:

  • Comprehensive literature review of delayed skin testing (patch, delayed prick/intradermal) for cutaneous adverse drug reactions.
  • Critical assessment of diagnostic test evidence across different drugs and SCAR phenotypes.
  • Analysis of diagnostic test limitations, including ex vivo, in vitro, in vivo, and HLA typing.

Main Results:

  • Delayed skin testing shows variable utility in diagnosing drug hypersensitivity.
  • Evidence for the effectiveness of patch and delayed prick/intradermal tests in SCARs is still developing.
  • No current diagnostic test guarantees 100% accuracy in ruling out SCARs.

Conclusions:

  • Delayed skin testing is a potential diagnostic tool for specific drug hypersensitivity reactions but requires further validation.
  • Lifelong avoidance of culprit drugs is paramount for SCARs due to durable immunity.
  • Improved diagnostic strategies are needed to enhance drug safety and manage patients with cutaneous ADRs.