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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: Risk factors

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: Overview

Drug Toxicity: Overview

Drug toxicity quantifies the harm a compound causes to an organism, varying by dose and potentially impacting whole systems or specific organs like the liver. Toxic reactions may arise from venomous insect or spider bites, with effects ranging from mild symptoms to severe outcomes such as brain damage or death. Common forms of acute poisoning include ethanol intoxication and overdose of pain or fever medications, with substances like GHB and heroin being particularly lethal at doses close to...

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...

Factors Affecting Drug Response: Overview

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When it comes to infants and young children, they are typically administered smaller doses of medication in comparison to adults. This is primarily because their organ functions still need to fully develop, meaning their bodies are not as efficient at metabolizing or eliminating drugs. Additionally, their blood-brain barrier is more permeable than in adults. As a result, high concentrations of drugs can easily penetrate the central nervous system (CNS), potentially leading to neurological...

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...

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Drug Repurposing Hypothesis Generation Using the "RE:fine Drugs" System

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Idiosyncratic drug reactions: past, present, and future.

Jack Uetrecht¹

¹Leslie Dan Facultyof Pharmacy, University of Toronto, Toronto, Canada. jack.uetrecht@utoronto.ca

Chemical Research in Toxicology

|December 7, 2007

Summary

Idiosyncratic drug reactions (IDRs) are complex immune-mediated events. Understanding their varied mechanisms is crucial for patient safety and reducing drug development uncertainty.

Area of Science:

Pharmacology
Immunology
Toxicology

Background:

Idiosyncratic drug reactions (IDRs) are unpredictable adverse drug events.
The hapten hypothesis, proposed in 1987, remains a primary explanation for IDRs.
Emerging hypotheses include the danger and pharmaceutical interaction hypotheses.

Purpose of the Study:

To review current understanding of idiosyncratic drug reaction mechanisms.
To highlight the role of immune mediation and reactive metabolites.
To identify challenges and future directions in IDR research.

Main Methods:

Review of existing literature on drug reaction mechanisms.
Analysis of genetic studies linking IDRs to HLA genes.
Discussion of evidence regarding reactive metabolites and alternative causes.

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Main Results:

Genetic evidence supports immune-mediated mechanisms for some IDRs.
Not all IDRs are caused by reactive metabolites, as seen with ximelagatran.
Biomarkers for predicting IDRs, such as cell stress markers, require systematic study.

Conclusions:

IDRs are complex and varied, challenging simple explanations.
Improved mechanistic understanding is needed to develop better predictive models and animal studies.
Continued basic research is essential due to the significant patient morbidity and mortality associated with IDRs.