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Nonlinear Pharmacokinetics: Dependence of Elimination Half-Life and Dose Clearance01:23

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The elimination half-life and drug clearance of drugs following nonlinear kinetics can vary with dosage. The Michaelis-Menten parameters and drug concentration influence these factors. As the dose increases, the elimination half-life tends to lengthen, resulting in a reduction in clearance and a disproportionately larger area under the curve. The total clearance can be derived from the Michaelis-Menten equation for drugs following a one-compartment model.
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Factors Affecting Drug Distribution: Organ Perfusion Rate01:15

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Drug distribution within the body is a complex process influenced by several factors, including perfusion rate, the rate at which the bloodstream transports drugs to tissue. This limitation becomes particularly significant when dealing with highly lipophilic drugs. In such cases, the rate at which the drug can move across membranes is crucial, and if the membrane is highly permeable to the drug, distribution becomes rate-limited by perfusion.
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Gentamicin, an aminoglycoside antibiotic, is commonly administered via intermittent intravenous infusion to treat severe infections. An intermittent one-hour infusion of gentamicin, administered at eight-hour intervals, allows for precise control of plasma drug concentrations, minimizing toxicity while ensuring therapeutic efficacy. Pharmacokinetic principles govern the dynamics of plasma concentrations and can be mathematically described using specific equations.The plasma drug concentration...
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Drug distribution in the pediatric population exhibits unique challenges and considerations due to the physiological differences between children, particularly neonates and infants, and adults. A crucial aspect of pediatric pharmacology is understanding how these differences impact the pharmacokinetics of various drugs, necessitating age-specific dosing strategies to ensure efficacy and safety.Neonates and infants have a higher total body water content, ~75%–90% of their body weight,...
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Updated: Mar 23, 2026

Microtransplantation of Synaptic Membranes to Reactivate Human Synaptic Receptors for Functional Studies
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Gabapentin concentrations and postmortem distribution.

Catherine E Hamm1, Ray D Gary2, Iain M McIntyre3

  • 1Forensic Toxicology Laboratory Supervisor, San Diego, CA, United States.

Forensic Science International
|April 4, 2016
PubMed
Summary
This summary is machine-generated.

Gabapentin analysis in postmortem cases indicates it is unlikely to redistribute. Central to peripheral blood ratios and liver to peripheral blood ratios were examined, showing consistent drug levels.

Keywords:
BloodDrug distributionGabapentinLiverPostmortemRedistribution

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Area of Science:

  • Forensic Toxicology
  • Pharmacology

Background:

  • Gabapentin is a common medication for epilepsy and neuropathic pain.
  • It generally has a good safety profile, with rare serious effects even in overdose.
  • Understanding its behavior in postmortem samples is crucial for accurate toxicological interpretation.

Purpose of the Study:

  • To investigate the potential for postmortem redistribution of gabapentin.
  • To determine central to peripheral blood (C/P) and liver to peripheral blood (L/P) ratios for gabapentin.

Main Methods:

  • Analysis of gabapentin concentrations in peripheral blood, central blood, and liver tissue from 30 postmortem cases.
  • Comparison of antemortem and postmortem blood gabapentin concentrations in one case.

Main Results:

  • The mean C/P ratio was 0.90 ± 0.24, with a median of 0.97.
  • The mean L/P ratio was 0.68 ± 0.26 L/kg, with a median of 0.65 L/kg.
  • Antemortem and postmortem gabapentin concentrations were identical in the single case studied.

Conclusions:

  • Gabapentin exhibits minimal postmortem redistribution.
  • The determined C/P and L/P ratios support the conclusion of limited redistribution.
  • These findings aid in the toxicological interpretation of gabapentin levels in postmortem investigations.