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Effect of Hepatic Disease on Pharmacokinetics: Active Drug, Metabolite and Fraction of Metabolized Drug01:14

Effect of Hepatic Disease on Pharmacokinetics: Active Drug, Metabolite and Fraction of Metabolized Drug

In pharmacotherapy, monitoring drug concentrations is paramount, especially for drugs whose therapeutic effects hinge on both the active compound and its metabolite. Hepatic impairment profoundly influences drug potency by altering liver function. If the drug is more potent than its metabolite, impaired liver function amplifies drug activity due to elevated drug concentration levels. Conversely, if the metabolite holds greater potency, diminished liver function diminishes drug activity by...
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...
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...
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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: 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...
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Drug–drug interactions can precipitate toxicity through multiple mechanisms. Absorption interactions alter how drugs enter the body, exemplified when ranitidine increases the absorption of basic drugs, while cholestyramine decreases the levels of propranolol. Protein binding interactions occur when drugs share the same binding sites on plasma proteins. Drugs like aspirin and warfarin, when bound in excess, can lead to increased free drug concentrations, enhancing the potential for...

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Related Experiment Video

Updated: Jun 23, 2026

Induction of Drug-Induced, Autoimmune Hepatitis in BALB/c Mice for the Study of Its Pathogenic Mechanisms
11:36

Induction of Drug-Induced, Autoimmune Hepatitis in BALB/c Mice for the Study of Its Pathogenic Mechanisms

Published on: May 29, 2020

Drug-induced hepatotoxicity.

N Kaplowitz, T Y Aw, F R Simon

    Annals of Internal Medicine
    |June 1, 1986
    PubMed
    Summary
    This summary is machine-generated.

    Drug-induced liver injury can mimic various liver diseases. Mechanisms involve cytochrome P450, reactive metabolites, and impaired bile secretion, affecting cellular functions and potentially causing chronic liver conditions.

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    Published on: May 29, 2020

    Inducing Acute Liver Injury in Rats via Carbon Tetrachloride (CCl4) Exposure Through an Orogastric Tube
    06:12

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    Human Liver Microphysiological System for Assessing Drug-Induced Liver Toxicity In Vitro
    11:06

    Human Liver Microphysiological System for Assessing Drug-Induced Liver Toxicity In Vitro

    Published on: January 31, 2022

    Area of Science:

    • Hepatology
    • Toxicology
    • Biochemistry

    Background:

    • Drug-induced liver injury (DILI) presents as diverse liver pathologies, mimicking both acute and chronic liver diseases.
    • Cytochrome P450 metabolism generates reactive metabolites, leading to cellular damage through covalent binding or lipid peroxidation.
    • Cellular defense mechanisms involving glutathione and tocopherol are crucial in mitigating drug-induced hepatic damage.

    Purpose of the Study:

    • To elucidate the mechanisms underlying drug-induced liver injury.
    • To differentiate between acute and chronic DILI presentations.
    • To understand the role of cellular defense in preventing liver damage.

    Main Methods:

    • Review of existing literature on DILI pathogenesis.
    • Analysis of biochemical pathways involved in drug metabolism and cellular defense.
    • Pathological comparison of DILI with known liver diseases.

    Main Results:

    • Acute DILI often results from reactive metabolites generated by cytochrome P450, impairing cellular functions like calcium homeostasis.
    • Cholestatic DILI arises from drug-induced alterations in bile secretion, affecting membrane transport proteins.
    • Chronic DILI can manifest pathologically, resembling chronic active hepatitis, biliary cirrhosis, or alcoholic liver disease.

    Conclusions:

    • Drug-induced liver injury encompasses a spectrum of conditions with varied mechanisms.
    • Understanding these mechanisms is key to diagnosing and managing DILI.
    • Cellular defense systems play a vital role in the susceptibility and severity of DILI.