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Drug Toxicity: Allergic Reactions01:30

Drug Toxicity: Allergic Reactions

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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...
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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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Allergic Drug Reactions01:27

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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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Drug toxicity: Idiosyncratic Reactions01:16

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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...
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Hypersensitivity Reactions: Delayed Hypersensitivity Reactions01:29

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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...
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Hypersensitivity Reactions: Cytolytic Reactions01:01

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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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Drug hypersensitivity.

Andreas J Bircher1

  • 1Allergy Unit, Department of Dermatology, University Hospital, Basel, Switzerland.

Chemical Immunology and Allergy
|June 14, 2014
PubMed
Summary
This summary is machine-generated.

Drug hypersensitivity reactions were rare before modern medicine, with historical remedies causing toxicity. Today, diverse drug reactions pose significant challenges in allergology.

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Area of Science:

  • Pharmacology
  • Immunology
  • Dermatology

Background:

  • Historically, remedies derived from plants, animals, and inorganic materials caused toxicity, with mercury intoxication for syphilis being a notable example.
  • The 19th century saw the identification of active principles in remedies and increased recognition of skin reactions, leading to the term 'drug exanthema' in 1877.

Observation:

  • Drug exanthemas range from mild macular-papular forms to severe, life-threatening bullous reactions like toxic epidermal necrolysis.
  • Systematic investigation of severe drug reactions commenced in the latter half of the 20th century, coinciding with advancements in immunology.

Findings:

  • Drug hypersensitivity reactions present manifold clinical manifestations and diverse pathophysiologies, making them a complex area within allergology.
  • The continuous introduction of new drugs contributes to the emergence of novel hypersensitivity reactions.

Implications:

  • Understanding the historical context of drug toxicity is crucial for appreciating the evolution of pharmacotherapy.
  • Continued research into drug hypersensitivity mechanisms is essential for managing and preventing adverse drug events.
  • The dynamic nature of drug development necessitates ongoing vigilance and adaptation in diagnosing and treating hypersensitivity reactions.