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Related Concept Videos

Drug Toxicity: Allergic Reactions01:30

Drug Toxicity: Allergic Reactions

Drug-related allergies are immune-mediated responses triggered by the administration of pharmacological agents. These hypersensitivity reactions are classified based on the immune mechanisms involved. The four primary types—Type I, II, III, and IV—are mediated by different immunological pathways and exhibit distinct clinical manifestations.Type I Hypersensitivity/ IgE-Mediated Reactions: Immunoglobulin E (IgE) immediately mediates Type I hypersensitivity reactions. Upon initial exposure to a...
Hypersensitivities01:30

Hypersensitivities

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...
Hypersensitivity Reactions: Delayed Hypersensitivity Reactions01:29

Hypersensitivity Reactions: Delayed Hypersensitivity Reactions

Delayed-Type Hypersensitivity (DTH), or Type IV hypersensitivity, is a cell-mediated immune response. It occurs when T cells, rather than antibodies, mediate a reaction to specific antigens. It is characterized by a delayed onset (1-2 days) and involves the recruitment of macrophages to the inflammation site.The initiation of a DTH response begins with the sensitization of T cells. During this phase, which lasts at least 1-2 weeks, antigen-specific T cells are activated, clonally expanded, and...
Drug toxicity: Idiosyncratic Reactions01:16

Drug toxicity: Idiosyncratic Reactions

Idiosyncratic drug reactions represent abnormal chemical responses that vary significantly among individuals, ranging from extreme sensitivity to low doses to insensitivity to high doses. These reactions often occur due to the drug's covalent binding with serum proteins, forming a foreign hapten that triggers an immunotoxicological response. The variability in drug reactions has a strong pharmacogenetic foundation, with genetic differences crucial in how individuals metabolize drugs. For...
Allergic Drug Reactions01:27

Allergic Drug Reactions

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 numerous...
Hypersensitivity Reactions: Cytolytic Reactions01:01

Hypersensitivity Reactions: Cytolytic Reactions

Type II hypersensitivity involves IgG and IgM antibodies targeting cell surface antigens, leading to cell destruction. This can occur through complement activation, antibody-dependent cell-mediated cytotoxicity (ADCC), or acting as opsonins for phagocytosis. When excessive, these reactions cause significant tissue damage.Drug-induced hemolytic anemia is a common example, where drugs like penicillin or cephalosporins bind to red blood cells, forming drug-protein complexes. These complexes...

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Related Experiment Video

Updated: Jul 13, 2026

Rapid Screening of HIV Reverse Transcriptase and Integrase Inhibitors
05:46

Rapid Screening of HIV Reverse Transcriptase and Integrase Inhibitors

Published on: April 9, 2014

Drug hypersensitivity in HIV.

Elizabeth Phillips1, Simon Mallal

  • 1Centre for Pharmacology & Infectious Diseases, Murdoch University, Murdoch, Western Australia, Australia. Phillips@murdoch.edu.au

Current Opinion in Allergy and Clinical Immunology
|July 11, 2007
PubMed
Summary

Individuals with HIV experience drug hypersensitivity 100 times more often. Genetic screening, like HLA-B*5701 for abacavir, is crucial for personalized medicine and improving drug safety in HIV patients.

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Quantitative Structure-Activity Relationship, Activity Prediction, and Molecular Dynamics of Non-nucleotide Reverse Transcriptase Inhibitors

Published on: May 9, 2025

Area of Science:

  • Immunology
  • Pharmacology
  • Infectious Diseases

Background:

  • Drug hypersensitivity is significantly more prevalent in individuals living with Human Immunodeficiency Virus (HIV).
  • Historically, hypersensitivity reactions involved drugs for HIV-related infections; currently, antiretroviral therapies themselves are primary culprits.
  • This review synthesizes current knowledge on the epidemiology, pathophysiology, and clinical manifestations of drug hypersensitivity in HIV patients.

Purpose of the Study:

  • To review the current understanding of drug hypersensitivity in patients with HIV.
  • To explore the epidemiology, pathophysiology, and clinical features of these reactions.
  • To highlight advancements in understanding host predisposition and genetic associations.

Main Methods:

  • Literature review focusing on drug hypersensitivity in HIV patients.
  • Analysis of immunogenetic and host predisposition studies.
  • Examination of clinical data and case reports.

Main Results:

  • Antiretroviral drugs like abacavir and nevirapine have significantly advanced understanding of drug hypersensitivity.
  • The strong association between abacavir hypersensitivity and HLA-B*5701 is a key finding.
  • This association provides a foundation for clinical genetic screening.

Conclusions:

  • HIV patients remain a critical population for studying drug hypersensitivity mechanisms.
  • Expanding antiretroviral therapy use in diverse global populations will further enhance knowledge.
  • HLA-B*5701 screening for abacavir hypersensitivity exemplifies personalized medicine and improved drug safety through genetic testing.