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Related Concept Videos

Allergic Reactions02:06

Allergic Reactions

26.4K
Overview
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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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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...
209
Allergic Reactions: Anaphylaxis01:30

Allergic Reactions: Anaphylaxis

280
Anaphylaxis is a severe, life-threatening hypersensitivity reaction mediated by Immunoglobulin E (IgE) antibodies. When IgE binds to allergens, it triggers the release of mediators– histamine, leukotrienes, and prostaglandins from mast cells and basophils. These mediators cause vasodilation, edema, and inflammation, leading to various symptoms.The primary allergens causing anaphylaxis include food items (e.g., peanuts, shellfish), drugs (e.g., penicillin, asparaginase, corticotropin,...
280
Hypersensitivity Reactions: Cytolytic Reactions01:01

Hypersensitivity Reactions: Cytolytic Reactions

208
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...
208
Drug toxicity: Idiosyncratic Reactions01:16

Drug toxicity: Idiosyncratic Reactions

220
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...
220

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Basophil Activation Test for Investigation of IgE-Mediated Mechanisms in Drug Hypersensitivity
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Isoniazid-induced anaphylaxis.

Michael J Crook1

  • 1Mt. McGregor Correctional Facility, New York State Department of Correctional Services, Wilton, New York, USA.

Journal of Clinical Pharmacology
|May 20, 2003
PubMed
Summary
This summary is machine-generated.

Isoniazid, a common antibiotic, can cause anaphylaxis, a severe allergic reaction. This case highlights the need for medical professionals to recognize this potentially fatal side effect.

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Area of Science:

  • Pharmacology
  • Clinical Medicine
  • Allergy and Immunology

Background:

  • Isoniazid is a first-line antibiotic for tuberculosis treatment.
  • Adverse drug reactions can range from mild to life-threatening.
  • Anaphylaxis is a critical medical emergency requiring immediate recognition and management.

Observation:

  • A case of anaphylaxis following isoniazid administration is presented.
  • The patient experienced a severe allergic reaction attributed to isoniazid.
  • This reaction occurred despite isoniazid being a commonly prescribed medication.

Findings:

  • Anaphylaxis is a potential, albeit rare, side effect of isoniazid therapy.
  • The presented case confirms isoniazid-induced anaphylaxis as a clinical possibility.
  • Early identification of this adverse drug reaction is crucial.

Implications:

  • Clinicians must maintain a high index of suspicion for isoniazid-induced anaphylaxis.
  • Awareness of this severe adverse drug reaction is essential for patient safety.
  • Prompt management protocols for anaphylaxis should be considered in patients on isoniazid.