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Related Concept Videos

Drug Concentrations: Measurements01:23

Drug Concentrations: Measurements

Drug concentration is the quantity of a drug present in a biological sample. Measuring drug amounts in biological samples allows the clinician to understand how a drug is absorbed, distributed, metabolized, and excreted. Samples can be obtained through invasive or non-invasive methods. Invasive techniques involve surgical or parenteral interventions to gather blood, cerebrospinal fluid, or tissue biopsy. Conversely, non-invasive approaches provide samples like urine, feces, and saliva.
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Therapeutic Drug Monitoring: Drug Analysis Methods

Therapeutic Drug Monitoring (TDM) is a clinical practice that measures specific drug levels in a patient's blood or body tissues to tailor drug therapy effectively. This monitoring is critical for managing drugs with narrow therapeutic indices like digoxin and phenytoin, ensuring they are both safe and effective. For instance, monitoring theophylline levels in asthma patients involves precision and sensitivity to adjust doses according to individual responses to therapy, ensuring efficacy and...
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Analysis of Population Pharmacokinetic Data

Analysis of population pharmacokinetic data involves studying the behavior of drugs within diverse populations to understand their pharmacokinetic parameters. Traditional pharmacokinetic methods typically involve collecting samples from a few individuals and estimating these parameters. While these methods are commonly used, they have limitations in capturing the variability in drug response among individuals or heterogeneous populations. Population pharmacokinetics is employed to address these...
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The acceptance criteria for dissolution profile data are anchored in Q values, representing the percentage of drug dissolved within a specified period. This assessment unfolds in three stages:First Stage: The test passes if all six drug dosage units are equal to or greater than Q plus 5%; otherwise, the sample proceeds to the second stage.Second Stage: The average of twelve units must be equal to or greater than Q, with no unit falling below Q - 15% to pass; if not, it progresses to the final...
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Drug dependence, abuse, and addiction are complex phenomena that can precipitate various abnormal states. Physical dependence refers to a state of pharmacological adaptation to a drug. This adaptation often results in tolerance—a reduced response to the drug after repeated administrations. When the drug use is abruptly stopped, withdrawal symptoms occur due to the body's need to readjust from the pharmacologically induced imbalance. However, tolerance and withdrawal symptoms do not necessarily...
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The statistical interpretation of bioequivalence data is a significant aspect of pharmaceutical research. Bioequivalence refers to the absence of any significant difference in the rate and extent to which the active ingredient in pharmaceutical products becomes available at the site of drug action when administered at the same molar dose under similar conditions. This helps determine if different drug products have similar absorption rates, ensuring their interchangeability.Statistical...

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Color Spot Test As a Presumptive Tool for the Rapid Detection of Synthetic Cathinones
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Published on: February 5, 2018

Illicit drug profiling, reflection on statistical comparisons.

Pierre Esseiva1, Laeticia Gaste, Daniel Alvarez

  • 1Institut de Police Scientifique, University of Lausanne, Bâtiment de Chimie, CH-1015 Lausanne-Dorigny, Switzerland. pierre.esseiva@unil.ch

Forensic Science International
|September 28, 2010
PubMed
Summary
This summary is machine-generated.

Statistical analysis of illicit drug profiling, specifically heroin and cocaine, reveals that data pre-treatment significantly impacts seizure linkage. Calculations must be re-evaluated for each application due to varying true positive and false positive rates.

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Published on: October 2, 2016

Area of Science:

  • Forensic Chemistry
  • Chemometrics
  • Criminalistics

Background:

  • Illicit drug profiling is crucial for linking seizures and informing criminal investigations.
  • Standardized statistical methods are needed for objective comparison of drug samples.
  • Previous studies have not fully explored the impact of data preprocessing on drug profiling outcomes.

Purpose of the Study:

  • To investigate the influence of data pre-treatment methods on statistical outcomes in illicit drug profiling.
  • To evaluate the impact of different statistical approaches on the comparison of heroin and cocaine seizures.
  • To determine the optimal statistical strategy for calculating linkage thresholds.

Main Methods:

  • Analysis of heroin and cocaine samples focusing on major alkaloid profiling.
  • Application of various data pre-treatment and transformation techniques to analytical data.
  • Statistical comparison of seizures using different scenarios to assess true positive (TP) and false positive (FP) rates.

Main Results:

  • Data pre-treatment significantly affects statistical outputs, influencing the determination of seizure linkage.
  • Varying TP and FP rates were observed across different pre-treatment scenarios for heroin and cocaine.
  • No universal statistical approach is suitable for all drug profiling applications.

Conclusions:

  • The choice of data pre-treatment is critical and directly impacts the reliability of statistical comparisons in drug profiling.
  • Threshold calculations for linking drug seizures require careful re-evaluation based on the specific dataset and analytical method.
  • A flexible and adaptable statistical framework is necessary for accurate forensic drug analysis.