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Drug Toxicity: Allergic Reactions

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...

Hypersensitivity Reactions: Cytolytic Reactions

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...

Hypersensitivities

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 Reactions

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...

Hypersensitivity Reactions: Immune-Complex Reactions

Hypersensitivity Reactions: Immune-Complex Reactions

Type III hypersensitivity reactions occur when antigen–antibody complexes form and activate the complement system. Normally, these complexes help the clearance of antigens by phagocytes and red blood cells. However, when large numbers of immune complexes are present, they can deposit in tissues—particularly in the walls of blood vessels—leading to inflammation and tissue injury. These deposits trigger complement activation and neutrophil recruitment, resulting in serum sickness, a systemic...

Allergic Drug Reactions

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...

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Updated: Jun 2, 2026

Rapid Screening of HIV Reverse Transcriptase and Integrase Inhibitors

Rapid Screening of HIV Reverse Transcriptase and Integrase Inhibitors

Published on: April 9, 2014

Hypersensitivity reactions to HIV therapy.

Mas Chaponda¹, Munir Pirmohamed

¹Department of Pharmacology and Therapeutics, University of Liverpool, Liverpool L69 3GL, UK.

British Journal of Clinical Pharmacology

|April 13, 2011

Summary

Drug hypersensitivity reactions are common in HIV treatment. Genetic factors, like HLA-B*5701 for abacavir, play a role, necessitating further research for better prevention strategies.

Area of Science:

Pharmacology
Immunology
Genetics

Background:

Drug hypersensitivity reactions (DHRs) are a significant concern in HIV treatment, affecting both older and newer medications.
The exact mechanisms of DHRs are often unclear, but emerging evidence points to a combination of immunologic and genetic factors, particularly involving the major histocompatibility complex (MHC).

Purpose of the Study:

To review the current understanding of drug hypersensitivity reactions in HIV treatment.
To highlight the role of genetic predisposition and the major histocompatibility complex (MHC) in DHRs.
To identify the need for further research into DHR mechanisms and prevention.

Main Methods:

Literature review and synthesis of existing research on drug hypersensitivity reactions in HIV therapy.

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Analysis of the role of genetic factors, specifically human leukocyte antigen (HLA) alleles, in DHRs.

Examination of current clinical practices and guidelines for managing DHRs.

Main Results:

DHRs are observed with various HIV medications, with varying severity and frequency.
Genetic factors, such as the HLA-B*5701 allele association with abacavir hypersensitivity, are implicated in DHRs.
Pre-prescription screening for HLA-B*5701 has proven clinically useful for abacavir, leading to guideline changes.

Conclusions:

While genetic testing aids in preventing abacavir hypersensitivity, effective preventive strategies for most other HIV drugs are lacking.
Clinical monitoring and supportive treatment remain the primary management approach for most DHRs.
Further research is crucial to elucidate DHR mechanisms and develop predictive genetic biomarkers or less immunogenic drug alternatives.