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Related Concept Videos

Hypersensitivity Reactions: Cytolytic Reactions01:01

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...
Drug toxicity: Idiosyncratic Reactions01:16

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 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...
Drug Toxicity: Risk factors01:24

Drug Toxicity: Risk factors

Adverse Drug Reactions (ADRs) are potential complications that arise during pharmacotherapy, influenced by multiple risk factors. Age plays a significant role; both neonates and the elderly are at heightened risk due to their respective immature and diminished metabolic and elimination processes. Gender also impacts ADRs, with females experiencing a 1.5 to 1.7-fold greater risk than males, which may be linked to pharmacokinetic, pharmacodynamic, and hormonal differences. Notably, neonates, the...
Drug Toxicity: Dose-Dependent Reactions01:24

Drug Toxicity: Dose-Dependent Reactions

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 Reactions01:19

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 3, 2026

Three Different Protocols of Corneal Collagen Crosslinking in Keratoconus: Conventional, Accelerated and Iontophoresis
07:29

Three Different Protocols of Corneal Collagen Crosslinking in Keratoconus: Conventional, Accelerated and Iontophoresis

Published on: November 12, 2015

Voriconazole-associated phototoxicity.

Ryan R Riahi, Philip R Cohen

    Dermatology Online Journal
    |March 9, 2011
    PubMed
    Summary
    This summary is machine-generated.

    Voriconazole, an antifungal, can cause sun-sensitive skin reactions. Strict sun protection can prevent or manage these phototoxic effects, allowing continued treatment.

    Related Experiment Videos

    Last Updated: Jun 3, 2026

    Three Different Protocols of Corneal Collagen Crosslinking in Keratoconus: Conventional, Accelerated and Iontophoresis
    07:29

    Three Different Protocols of Corneal Collagen Crosslinking in Keratoconus: Conventional, Accelerated and Iontophoresis

    Published on: November 12, 2015

    Area of Science:

    • Pharmacology
    • Dermatology
    • Oncology

    Background:

    • Voriconazole is a broad-spectrum triazole antifungal used for invasive fungal infections.
    • Phototoxicity, including photodistributed rashes, is a known side effect of voriconazole.
    • Long-term voriconazole use has been linked to skin cancers like melanoma and squamous cell carcinoma.

    Observation:

    • A 59-year-old male with acute myeloid leukemia post-stem cell transplant developed fungal pneumonia.
    • Initial treatment with posaconazole was switched to voriconazole due to dosing issues.
    • The patient subsequently developed a photodistributed macular erythema on sun-exposed areas.

    Findings:

    • The patient's rash appeared after increased sun exposure while on voriconazole therapy.
    • The observed reaction was consistent with voriconazole-induced phototoxicity.
    • This case highlights the potential for voriconazole to cause acute phototoxic reactions.

    Implications:

    • Photoprotective measures are crucial for patients treated with voriconazole.
    • Adherence to photoprotection can prevent voriconazole-related phototoxicity and its recurrence.
    • Preventing phototoxicity may allow for uninterrupted voriconazole treatment, crucial for managing serious fungal infections.