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Adrenergic Antagonists: ɑ and β-Receptor Blockers01:31

Adrenergic Antagonists: ɑ and β-Receptor Blockers

Third-generation β-blockers, such as labetalol and carvedilol, represent a significant advancement in managing cardiovascular conditions. Unlike conventional β-blockers, which can induce peripheral vasoconstriction, third-generation drugs block α1 adrenoceptors. This promotes vasodilation through several mechanisms, such as increased nitric oxide production, inhibition of calcium ion entry, opening of potassium ion channels, and antioxidant action. Labetalol, for instance, is clinically...
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Chronic liver disease significantly impacts drug metabolism due to alterations in hepatic blood flow and enzyme accessibility. This disruption affects the body's pharmacokinetics—the movement and processing of drugs within the system. Key enzymes crucial for metabolizing medications become less accessible, changing how drugs are processed and utilized. Furthermore, liver disease influences the synthesis of plasma proteins, such as albumin and globulins, which play critical roles in drug binding...
Effect of Hepatic Disease on Pharmacokinetics: Pathophysiologic Assessment and Liver Function Test01:22

Effect of Hepatic Disease on Pharmacokinetics: Pathophysiologic Assessment and Liver Function Test

In clinical practice, the direct measurement of hepatic blood flow to evaluate liver function presents significant challenges due to the intricate and specialized nature of the necessary techniques. Consequently, healthcare professionals often rely on empirical estimates derived from thorough patient examinations and liver function tests to gauge liver health. Among the tools at their disposal, the Child–Pugh and MELD scoring systems stand out for their ability to categorize and assess the...
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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...
Drug toxicity: Drug–Drug Interaction01:30

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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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Heterotopic Auxiliary Rat Liver Transplantation With Flow-regulated Portal Vein Arterialization in Acute Hepatic Failure
16:19

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Published on: September 13, 2014

Labetalol hepatotoxicity.

J A Clark1, H J Zimmerman, L A Tanner

  • 1Food and Drug Administration, Rockville, Maryland.

Annals of Internal Medicine
|August 1, 1990
PubMed
Summary
This summary is machine-generated.

Labetalol use is linked to 11 cases of liver damage, including three fatalities, in the US. Patient recovery after stopping labetalol suggests a drug-induced liver injury, highlighting the need for vigilance.

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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

Area of Science:

  • Hepatology
  • Clinical Pharmacology

Background:

  • Labetalol is a medication used to treat high blood pressure.
  • Hepatocellular damage is a serious adverse event that can occur with drug use.

Observation:

  • The Food and Drug Administration (FDA) received 11 reports of hepatocellular damage associated with labetalol, with three cases being fatal.
  • Nine patients showed improvement after discontinuing labetalol, and one experienced a relapse upon restarting the medication.
  • Investigations ruled out other common causes of liver damage, such as viral or toxic hepatitis.

Findings:

  • Histological examination in five cases revealed hepatocellular necrosis in four instances and chronic active hepatitis in one.
  • The clinical presentation suggests a mechanism of metabolic idiosyncrasy, although other pathogenetic explanations remain possible.

Implications:

  • These findings suggest a potential link between labetalol and drug-induced liver injury (DILI).
  • Healthcare providers should monitor patients for signs of liver damage when prescribing labetalol.
  • Further research may be warranted to elucidate the exact mechanism of labetalol-induced hepatotoxicity.