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Related Concept Videos

Dosage Regimen: Individualization01:24

Dosage Regimen: Individualization

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Individualization in dosing regimens is the customization of medication doses for individual patients. Its necessity arises from the goal of maximizing therapeutic benefits while minimizing risks. This approach is pivotal because human responses to drugs can vary widely; what is effective for one person may be inadequate or excessive for another. Interpatient (intersubject) variability refers to differences in drug responses between individuals, while intrapatient (intrasubject) variability...
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Drug Dosing in Renal Diseases: Dose Adjustments Based on Drug Clearance and Elimination Rate Constant01:25

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In patients with renal disease, dosage adjustments are necessary to maintain therapeutic plasma drug concentrations and prevent toxicity or subtherapeutic exposure. Renal impairment alters drug pharmacokinetics, especially in conditions like uremia, where changes such as prolonged elimination half-life and altered apparent volume of distribution can significantly affect drug disposition. These changes require careful modification of the dosing regimen to achieve the desired clinical...
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Dosage Regimens: Designs and Approaches01:28

Dosage Regimens: Designs and Approaches

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Designing a dosage regimen, which refers to the manner of drug administration, is a complex process involving the selection of drug dose, route, and frequency. This process is underpinned by pharmacokinetic parameters derived from tests and population averages. These parameters are then tailored to patient-specific variables such as diagnosis, demographics, and allergy status. Once therapy commences, therapeutic response monitoring is critical and achieved through clinical and physical...
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Determination of Multiple Dosing Parameters: Loading and Maintenance Doses01:25

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A loading dose is an essential pharmacological strategy to rapidly achieve the target plasma drug concentration necessary for an immediate therapeutic effect. This approach is especially critical for drugs characterized by slow absorption or extended half-lives, where delaying therapeutic plasma levels could compromise treatment outcomes. By administering a loading dose, clinicians ensure a prompt onset of drug action, even for agents with complex pharmacokinetic profiles.Achieving steady-state...
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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

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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...
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Rational Dosage Regimen: Maintenance Dose and Loading Dose01:24

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A rational dosage regimen considers a drug's pharmacokinetics, including its absorption, distribution, metabolism, and elimination from the body. By understanding these factors, the appropriate dosage can be determined, and the dosing schedule can be designed to achieve and maintain the desired therapeutic effect while minimizing adverse effects.
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Related Experiment Video

Updated: Mar 23, 2026

Positron Emission Tomography-based Dose Painting Radiation Therapy in a Glioblastoma Rat Model using the Small Animal Radiation Research Platform
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Adaptive dose modification for phase I clinical trials.

Yiyi Chu1, Haitao Pan2, Ying Yuan2

  • 1Department of Biostatistics, The University of Texas School of Public Health, Houston, 77030, TX, U.S.A.

Statistics in Medicine
|March 31, 2016
PubMed
Summary
This summary is machine-generated.

This study introduces an adaptive dose modification (ADM) method to improve oncology clinical trials. ADM helps find the optimal maximum-tolerated dose by adding new doses when needed, enhancing patient safety and treatment efficacy.

Keywords:
MTDdose findingdose modificationnonparametric estimationphase I trials

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Area of Science:

  • Oncology
  • Clinical Trial Design
  • Biostatistics

Background:

  • Phase I oncology trials typically identify a maximum-tolerated dose (MTD) from a limited set of prespecified doses.
  • Current methods may fail to identify the true MTD due to incomplete understanding of dose-toxicity relationships.

Purpose of the Study:

  • To propose an adaptive dose modification (ADM) method to enhance dose-finding in oncology.
  • To improve the precision of MTD identification by allowing dose adjustments during trials.

Main Methods:

  • ADM is a flexible method that can be integrated with existing dose-finding techniques.
  • It categorizes toxicity probability into underdosing, acceptable, and overdosing regions.
  • New doses are adaptively introduced using a nonparametric local polynomial regression model when the acceptable region is not adequately represented.

Main Results:

  • Simulation studies demonstrated that ADM significantly outperforms existing comparable methods.
  • The method was successfully applied to a real-world phase I cancer trial.

Conclusions:

  • ADM offers a robust approach to adaptively determine optimal doses in clinical trials.
  • This method enhances the ability to find the true MTD, potentially improving patient outcomes and trial efficiency.