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Related Concept Videos

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...
Drug Toxicity: Overview01:00

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...
Hepatic Encephalopathy01:29

Hepatic Encephalopathy

DefinitionHepatic encephalopathy is a reversible neurologic syndrome that results from advanced liver dysfunction or portosystemic shunting. It leads to disturbances in cognition, behavior, and motor function due to the brain’s exposure to gut-derived toxins that the liver fails to detoxify.EtiologyThis condition develops either in the setting of acute fulminant hepatitis or progressively during chronic liver disease, such as cirrhosis and portal hypertension. Portosystemic shunting—including...
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...
Effect of Hepatic Disease on Pharmacokinetics: Dose Adjustments Due to Hepatic Impairment01:08

Effect of Hepatic Disease on Pharmacokinetics: Dose Adjustments Due to Hepatic Impairment

Hepatic impairment, characterized by decreased liver function, does not uniformly mandate adjustments in drug dosage. Whether dosage modifications are necessary depends on various factors related to the drug's metabolism and elimination pathways. If a drug is primarily excreted via the kidneys and bypasses significant hepatic processing, if it undergoes minimal metabolic transformation in the liver, or if it is volatile and primarily expelled through the lungs, dose adjustments may not be...

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Human Liver Microphysiological System for Assessing Drug-Induced Liver Toxicity In Vitro
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Published on: January 31, 2022

Temozolomide induced liver injury.

Sanjay Dixit1, Mohan Hingorani, Ponnambath Afzal

  • 1Castle Hill Hospital, Hull, UK. sanjay.dixit@hey.nhs.uk

Acta Neurologica Belgica
|December 7, 2011
PubMed
Summary

Temozolomide (TMZ) can cause severe liver injury, presenting as cholestasis, in Glioblastoma patients. This case highlights a rare instance of drug-induced liver injury (DILI) from TMZ, emphasizing the need for vigilant monitoring.

Area of Science:

  • Hepatology
  • Oncology
  • Clinical Pharmacology

Background:

  • Glioblastoma (GB) is a primary brain tumor often treated with radiotherapy and chemotherapy.
  • Temozolomide (TMZ) is a common chemotherapeutic agent used in GB treatment.
  • Drug-induced liver injury (DILI) is a potential adverse effect of various medications.

Observation:

  • A 62-year-old female patient with GB developed severe liver dysfunction during radiotherapy with daily TMZ.
  • Histopathology revealed acute cholestasis and focal parenchymal inflammation, with no other identifiable cause.
  • The patient experienced grade three hepatic failure requiring prolonged hospitalization and slow liver function recovery.

Findings:

  • This case represents a potential instance of Temozolomide-induced liver injury (TMZ-DILI), characterized by cholestasis.

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  • The observed liver injury pattern differs from Dacarbazine-induced veno-occlusive liver damage.
  • The Naranjo Adverse Drug Reaction (ADR) probability scale indicated a probable grade (Scale 7) for TMZ-DILI.
  • Implications:

    • This case underscores the rare but serious hepatotoxicity associated with Temozolomide.
    • Clinicians should consider TMZ-DILI in patients presenting with unexplained liver enzyme elevation during treatment.
    • Further research is warranted to elucidate the mechanisms and incidence of TMZ-induced liver injury.