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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...
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Allergic Reactions: Anaphylaxis

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, heparin),...
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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Local anesthetics (LAs) are commonly used for various applications in medical and dental procedures. Some of the common agents used are cocaine, lidocaine, and bupivacaine.
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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...

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Contact Hypersensitivity as a Murine Model of Allergic Contact Dermatitis
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Chlorhexidine allergy due to topical application.

Nandita N Keni1, Meena A Aras, Vidya Chitre

  • 1Department of Prosthodontics, Goa Dental College, Goa, India.

Indian Journal of Dental Research : Official Publication of Indian Society for Dental Research
|February 21, 2013
PubMed
Summary

Allergic reactions to chlorhexidine, a common dental antiseptic, can occur. This case report details a severe allergic reaction following topical chlorhexidine application, highlighting potential risks.

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Area of Science:

  • Dentistry
  • Allergology
  • Pharmacology

Background:

  • Chlorhexidine is a widely utilized antiseptic agent in dental practice, available in various formulations.
  • Allergic reactions to chlorhexidine, encompassing both immediate and delayed hypersensitivity, have been documented.
  • While uncommon, chlorhexidine allergy can present with severe clinical manifestations in susceptible individuals.

Observation:

  • This report focuses on a specific case of allergy to chlorhexidine.
  • The allergy was identified subsequent to the topical application of chlorhexidine.
  • The patient experienced a notable adverse reaction attributed to chlorhexidine exposure.

Findings:

  • The case illustrates a patient developing an allergic response to chlorhexidine.
  • The reaction occurred after the use of chlorhexidine in a topical dental application.
  • This finding underscores the potential for hypersensitivity even with localized chlorhexidine use.

Implications:

  • Healthcare providers should be vigilant for potential chlorhexidine allergies in dental patients.
  • Awareness of severe reactions is crucial for timely diagnosis and management.
  • This case emphasizes the importance of considering topical agents as triggers for allergic responses in dentistry.