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Related Concept Videos

Bioavailability Study Design: Single Versus Multiple Dose Studies01:11

Bioavailability Study Design: Single Versus Multiple Dose Studies

Bioavailability studies are essential for understanding how a drug is absorbed, distributed, metabolized, and excreted in the body. These studies assess the extent and rate at which the active pharmaceutical agent becomes available at the site of action. The design of bioavailability studies can involve single-dose or multiple-dose regimens, each with distinct advantages and limitations.Single-dose studies are the preferred approach due to their simplicity and reduced drug exposure for...
Bioavailability Study Design: Healthy Subjects Versus Patients01:15

Bioavailability Study Design: Healthy Subjects Versus Patients

Bioavailability studies are essential for evaluating a drug's therapeutic efficacy and understanding its absorption patterns under various physiological conditions. Conducting such studies on target patient populations provides more relevant data by simulating real-world disease states. However, practical challenges often necessitate the use of young, healthy adult volunteers as study subjects.Patients may exhibit altered drug absorption patterns due to the effects of the disease itself,...
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CNS Depressants: Alcohol and Nicotine

Ethanol, a clear colorless alcohol, has been consumed by humans for millennia, but its effects on the body are far from benign. At lower doses, it induces decreased inhibitions and loquaciousness, leading to its social appeal. However, it can cause severe consequences at higher doses, such as coma and respiratory depression, due to its zero-order elimination kinetics. Chronic ethanol abuse wreaks havoc on multiple organ systems, particularly the CNS and the liver. Abrupt cessation of ethanol...
Dosage Regimen: Multiple Oral Dosage01:25

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Understanding how a drug's concentration fluctuates within the body over time is crucial in pharmacokinetics, particularly with multiple oral doses. A graphical representation of multiple oral dosages provides insight into these dynamics. Typical accumulation curves of a drug's concentration in the body reveal a sawtooth pattern, indicating periodic peaks and troughs correlating with each dose administration and the drug's subsequent elimination.The plasma concentration at any time during an...
Dosage Regimens: Partial Pharmacokinetic Parameters01:01

Dosage Regimens: Partial Pharmacokinetic Parameters

It is not uncommon for complete drug pharmacokinetic profiles to remain elusive in pharmacokinetics. This necessitates certain educated assumptions by pharmacokineticists to determine appropriate dosage regimens without comprehensive pharmacokinetic data from animal or human studies. One prevalent assumption is setting the bioavailability factor, denoted as F, to 1 or 100%. This assumption caters to the scenario where a drug doesn't achieve full systemic absorption, resulting in the patient...
Dose Size and Dosing Frequency: Determination Methods01:21

Dose Size and Dosing Frequency: Determination Methods

Determining the optimal dose size and dosing frequency in pharmacotherapy is crucial for achieving therapeutic effectiveness while minimizing adverse effects. This article explores the methodologies employed in determining these parameters, focusing on their significance and interplay to tailor dosing regimens.Dose Size: Dose size refers to the amount of a drug administered in a single dose. It is determined based on the drug's pharmacodynamics and pharmacokinetics properties and...

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The Motivation for Alcohol Reward: Predictors of Progressive-Ratio Intravenous Alcohol Self-Administration in Humans
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Obtaining the optimal dose in alcohol dependence studies.

Nolan A Wages1, Lei Liu, John O'Quigley

  • 1Division of Translational Research and Applied Statistics, Department of Public Health Sciences, University of Virginia Charlottesville, VA, USA.

Frontiers in Psychiatry
|November 29, 2012
PubMed
Summary

This study introduces adaptive designs, like the continual reassessment method (CRM), for alcohol dependence pharmacotherapy. These methods efficiently find optimal medication doses, balancing efficacy and safety in alcohol treatment research.

Keywords:
alcohol researchcontinual reassessment methoddose-findingmaximum tolerated dosemost successful dose

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Area of Science:

  • Pharmacotherapy research
  • Clinical trial design
  • Alcohol dependence treatment

Background:

  • Determining optimal medication doses in alcohol dependence studies is crucial for efficacy and safety.
  • Existing dose-finding methodologies from cancer and HIV research can be adapted.

Purpose of the Study:

  • To advocate for and illustrate the use of adaptive dose-finding designs in alcohol dependence pharmacotherapy.
  • To accelerate the development of effective medications for alcohol use disorder.

Main Methods:

  • Description of the continual reassessment method (CRM) as an adaptive trial design.
  • Application of adaptive designs to identify optimal topiramate dosage for alcohol treatment.
  • Utilizing dose-finding methodology proven in cancer and HIV research.

Main Results:

  • Adaptive designs offer a cost-effective approach to dose identification.
  • The continual reassessment method (CRM) balances experimental needs with ethical considerations.
  • Demonstration of adaptive design application in a topiramate alcohol treatment trial.

Conclusions:

  • Adaptive designs represent a novel and efficient approach for alcohol dependence pharmacotherapy.
  • Implementing adaptive designs can expedite the discovery of optimal alcohol treatment medications.
  • This methodology enhances the precision and ethical conduct of dose-finding studies.