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Related Concept Videos

Drug Toxicity: Allergic Reactions01:30

Drug Toxicity: Allergic Reactions

152
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...
152
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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Drug toxicity: Idiosyncratic Reactions01:16

Drug toxicity: Idiosyncratic Reactions

172
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...
172
Drug Excretion: Miscellaneous Routes01:10

Drug Excretion: Miscellaneous Routes

474
Drug excretion involves various organs, including the liver, intestines, skin, and eyes. In the case of drugs or toxins, they can be actively secreted into bile by transporters in the hepatocyte's canalicular membrane. These substances enter the GI tract during digestion and may be reabsorbed into the body from the intestine. This process, known as enterohepatic recycling, can significantly prolong the presence and effects of a substance in the body. To interrupt this cycle, specific...
474
Hypersensitivity Reactions: Cytolytic Reactions01:01

Hypersensitivity Reactions: Cytolytic Reactions

135
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...
135
Hypersensitivity Reactions: Immune-Complex Reactions01:19

Hypersensitivity Reactions: Immune-Complex Reactions

175
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...
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Granulocyte-dependent Autoantibody-induced Skin Blistering
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Granulomatous Drug Eruptions.

Roni P Dodiuk-Gad1, Neil H Shear2

  • 1Division of Dermatology, Department of Medicine, Sunnybrook Health Sciences Centre, 2075 Bayview Ave., Room M1-737, Toronto, ON M4N 3M5, Canada; Department of Dermatology, Ha'emek Medical Center, Afula 18101, Israel.

Dermatologic Clinics
|July 6, 2015
PubMed
Summary

This review covers rare granulomatous drug eruptions, focusing on four main types. Understanding these reactions is key for diagnosing and managing challenging skin conditions caused by medications.

Keywords:
DrugGranulomaGranulomatous drug eruptionsNoninfectious granulomaSkin

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Area of Science:

  • Dermatology
  • Immunology
  • Pharmacology

Background:

  • Granuloma formation is a host defense mechanism against persistent irritants.
  • Noninfectious granulomatous skin disorders present diagnostic challenges due to overlapping features.
  • Drug reactions manifesting as granulomas are uncommon and characterized by histiocyte predominance.

Purpose of the Study:

  • To review and summarize current knowledge on granulomatous drug eruptions.
  • To focus on the four major types of drug-induced granulomatous reactions.

Main Methods:

  • Literature review of existing studies and case reports.
  • Synthesis of information on clinical and histological characteristics.
  • Classification of drug-induced granulomatous reactions.

Main Results:

  • Identified four major types of granulomatous drug eruptions.
  • Detailed the specific characteristics of each type: interstitial granulomatous drug reaction, drug-induced accelerated rheumatoid nodulosis, drug-induced granuloma annulare, and drug-induced sarcoidosis.

Conclusions:

  • Granulomatous drug eruptions represent a rare but significant group of adverse drug reactions.
  • Recognition of these distinct entities is crucial for accurate diagnosis and patient management.
  • Further research may elucidate underlying mechanisms and improve treatment strategies.