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Drug toxicity: Idiosyncratic Reactions

Drug toxicity: Idiosyncratic Reactions

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...

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...

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...

Drug Toxicity: Dose-Dependent Reactions

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Drug toxicities can be stratified into pharmacological, pathological, or genotoxic based on their mechanisms. The incidence and severity of these toxicities generally increase with the drug's concentration in the body and exposure time.Pharmacological toxicity is evident when the therapeutic effects of drugs overshoot into adverse reactions in a predictable, dose-dependent manner. Central nervous system (CNS) depression from barbiturates is a classic example, with effects escalating from...

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...

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Related Experiment Video

Updated: Jun 30, 2026

Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions

Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions

Published on: July 17, 2020

Voriconazole-induced photosensitivity.

Anurag N Malani¹, David M Aronoff

¹Division of Infectious Diseases, St. Joseph Mercy Hospital, 5333 McAuley Dr Suite 3106, Ypsilanti, MI 48197, USA. malanian@umich.edu

Clinical Medicine & Research

|September 20, 2008

Summary

This summary is machine-generated.

Voriconazole, an antifungal drug, can cause photosensitivity reactions, a specific skin issue. This case study shows that stopping voriconazole treatment resolved the photosensitivity in a patient with Candida parapsilosis endocarditis.

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Published on: July 17, 2020

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Area of Science:

Dermatology
Mycology
Pharmacology

Background:

Voriconazole is a broad-spectrum triazole antifungal medication.
It is used to treat serious fungal infections like invasive aspergillosis and candidiasis.
Adverse cutaneous reactions occur in less than 10% of patients, ranging from mild rashes to severe conditions.

Observation:

Photosensitivity is an uncommon but characteristic skin reaction to voriconazole.
This reaction is more frequently observed with chronic voriconazole administration.
The study presents a case of voriconazole-induced phototoxicity in a 50-year-old male patient.

Findings:

The patient had Candida parapsilosis endocarditis.
Voriconazole therapy was associated with phototoxic dermatitis.
Discontinuation of voriconazole led to the reversal of the photosensitivity reaction.

Implications:

This case highlights voriconazole-induced phototoxicity as a potential adverse drug reaction.
Awareness of this side effect is crucial for clinicians managing patients on voriconazole.
Prompt recognition and drug withdrawal can effectively manage voriconazole-related photosensitivity.