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Dose Size and Dosing Frequency: Determination Methods01:21

Dose Size and Dosing Frequency: Determination Methods

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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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Drug Dosing in Renal Diseases: Dose Adjustments Based on Drug Clearance and Elimination Rate Constant01:25

Drug Dosing in Renal Diseases: Dose Adjustments Based on Drug Clearance and Elimination Rate Constant

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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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Chemotherapy-Induced Nausea and Vomiting: 5-HT3 Receptor Antagonists01:27

Chemotherapy-Induced Nausea and Vomiting: 5-HT3 Receptor Antagonists

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5-HT3 receptor antagonists, such as dolasetron, granisetron (Kytril), ondansetron (Zofran), and palonosetron (Axoli), are crucial in managing chemotherapy-induced nausea and vomiting (CINV) and postoperative nausea. These drugs selectively block 5-HT3 receptors in the visceral vagal and spinal afferent nerves, chemoreceptor trigger zone, and the vomiting center. They have a rapid onset of action and can be given as a single dose before chemotherapy. Ondansetron and granisetron, in particular,...
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Determination of Multiple Dosing Parameters: Loading and Maintenance Doses01:25

Determination of Multiple Dosing Parameters: Loading and Maintenance Doses

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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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Cancer Therapies02:49

Cancer Therapies

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Cancer therapies are various modes of treatment, such as surgery, radiation therapy, and chemotherapy that are administered to cancer patients.
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In patients with renal impairment, drugs undergo significant changes in their pharmacokinetics, which require dosage adjustments to ensure safe and effective therapy.
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Related Experiment Video

Updated: Dec 22, 2025

Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition
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Dose Issues in Cancer Chemotherapy.

Syed A A Rizvi1, Yasser Shahzad2, Ayman M Saleh3

  • 1Department of Pharmaceutical Sciences, Hampton University School of Pharmacy, Hampton, Virginia, USA, syed.rizvi@hamptonu.edu.

Oncology
|May 6, 2020
PubMed
Summary

This review examines human methotrexate dosing, comparing low, intermediate, and high doses against in vitro and in vivo study data. Understanding these methotrexate regimens is crucial for effective cancer chemotherapy development.

Keywords:
Animal doseAnimal-to-human extrapolationCell culture doseHuman doseMethotrexatePharmacologically active drug concentration

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Area of Science:

  • Oncology
  • Pharmacology
  • Cell Biology

Background:

  • Methotrexate is a key chemotherapy agent.
  • Cancer drug development relies on in vitro and in vivo screening.
  • Understanding optimal dosing is critical for treatment efficacy.

Observation:

  • This review analyzes human methotrexate dosing regimens.
  • It correlates clinical dosing with in vitro cell culture data.
  • In vivo animal and human study data are also compared.

Findings:

  • Low-dose, intermediate-dose, and high-dose methotrexate therapies are discussed.
  • The relationship between different dosing strategies and experimental data is explored.
  • Effectiveness criteria across various study types are compared.

Implications:

  • This comparison aids in the development of more effective cancer chemotherapy.
  • Optimizing methotrexate dosage can improve patient outcomes.
  • Standardizing evaluation criteria enhances drug development pipelines.