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Related Concept Videos

Dosage Regimens: Partial Pharmacokinetic Parameters01:01

Dosage Regimens: Partial Pharmacokinetic Parameters

40
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...
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Dosage Regimens: Designs and Approaches01:28

Dosage Regimens: Designs and Approaches

98
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...
98
Dosage Interval and Administration Route: Determination Methods01:19

Dosage Interval and Administration Route: Determination Methods

59
A medication’s effectiveness largely depends on its appropriate dosage and the route of administration. Dosage ensures that a sufficient drug concentration is maintained in the bloodstream to elicit the desired therapeutic effect without causing toxicity. The route of administration affects the drug's bioavailability, rate of absorption, and onset of action, which are crucial for achieving optimal therapeutic outcomes. Drug dosage calculations are critical to tailoring therapy to...
59
Determination of Multiple Dosing Parameters: Loading and Maintenance Doses01:25

Determination of Multiple Dosing Parameters: Loading and Maintenance Doses

51
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...
51
Drug Accumulation During Multiple Dosing: Repetitive IV Injections01:21

Drug Accumulation During Multiple Dosing: Repetitive IV Injections

79
Calculating drug dosage and accumulation in multiple-dose regimens is crucial for achieving therapeutic efficacy while avoiding toxicity. This involves determining the plasma drug concentrations over time to optimize dosing schedules. The principle of superposition is fundamental in this process, allowing for the prediction of drug concentration in plasma following multiple doses based on single-dose data.The principle of superposition asserts that the plasma concentration-time curves from...
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Dose Size and Dosing Frequency: Determination Methods01:21

Dose Size and Dosing Frequency: Determination Methods

52
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...
52

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Related Experiment Video

Updated: Nov 7, 2025

Using Continuous Data Tracking Technology to Study Exercise Adherence in Pulmonary Rehabilitation
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Primary medication nonadherence calculation method specifications impact resulting rates.

Autumn D Zuckerman1, Josh DeClercq2, Nisha B Shah1

  • 1Department of Pharmaceutical Services, Vanderbilt University Medical Center, Nashville, TN, USA.

Research in Social & Administrative Pharmacy : RSAP
|April 30, 2021
PubMed
Summary
This summary is machine-generated.

Varying parameter specifications significantly impacts primary medication nonadherence (PMN) rates in oncology patients. Standardizing definitions for lookback, duplicate, and fill windows is crucial for accurate PMN reporting.

Keywords:
Medication adherenceOncologyPrimary medication nonadherenceSpecialty pharmacy

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Area of Science:

  • Oncology Pharmacy
  • Health Outcomes Research
  • Medication Adherence

Background:

  • Primary medication nonadherence (PMN) rates vary widely due to inconsistent calculation methods.
  • The impact of specific parameter definitions on PMN rates remains unassessed.

Purpose of the Study:

  • To evaluate how lookback window (LBW), duplicate window (DW), and fill window (FW) specifications affect PMN rates.
  • Focus on patients with specialty self-administered oncology medications.

Main Methods:

  • Retrospective cohort analysis of 4,482 oncology prescriptions.
  • Calculated PMN using 24 methods varying LBW (90/180 days), DW (2/7/30 days), and FW (14/30/60/90 days).
  • PMN defined as unsold prescriptions within FW divided by eligible prescriptions.

Main Results:

  • PMN rates ranged from 16% to 23% across methods.
  • Adjusting FW consistently impacted PMN rates.
  • LBW and DW had minimal impact on overall PMN rates.

Conclusions:

  • Different PMN definitions significantly alter study outcomes.
  • Researchers must clearly report all parameter specifications when using PMN.