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Related Concept Videos

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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Drug Dosage Regimen: Overview01:15

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A drug dosage regimen describes the specific instructions and schedule for administering a drug to a patient. It considers factors such as drug dosage, frequency, route of administration, and duration of treatment. Designing an appropriate dosage regimen for a patient aims to achieve a target drug concentration at the site of action.
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Dosage Regimen: Individualization01:24

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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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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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Dosage Regimen: Fixed Dose01:01

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Fixed-dose regimens are a common approach to administer drugs to achieve and maintain desired levels of the drug in the body. In this dosing strategy, a specific amount of medication is given at regular intervals, often multiple times a day, to ensure a consistent drug concentration in the bloodstream.
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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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Dealing with large-scale supply lines when introducing new regimens.

Christine Malati1, Joshua Rosenfeld, Sherif Mowafy

  • 1Division of Supply Chain for Health, Office of HIV/AIDS, United States Agency for International Development, Bureau for Global Health, Washington, District of Columbia, USA.

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Successful HIV treatment transitions require careful supply chain management. Balancing new antiretroviral (ARV) introduction with old regimen phasing prevents shortages and ensures patient access to medication.

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Area of Science:

  • Global health
  • HIV/AIDS treatment
  • Pharmaceutical supply chain management

Background:

  • Introduction of new antiretroviral (ARV) drugs into HIV treatment regimens necessitates careful supply chain planning.
  • Balancing the introduction of new ARVs with the discontinuation of older ones is critical to avoid stockouts or oversupply.
  • Understanding the global ARV market dynamics is essential for successful regimen transitions.

Purpose of the Study:

  • To outline key supply chain considerations for introducing new antiretroviral drugs in HIV treatment programs.
  • To emphasize the importance of a coordinated approach to phasing out old regimens while introducing new ones.
  • To highlight the need for stakeholders to understand the global ARV market and manufacturing impacts on transitions.

Main Methods:

  • Drawing on experiences from the President's Emergency Plan for AIDS Relief (PEPFAR) by the United States Agency for International Development.
  • Engaging all key stakeholders, including clinicians, advocacy groups, supply chain professionals, ministries, and donors, in transition planning.
  • Conducting regular national quantification and supply planning for all ARV regimens.
  • Implementing a system for introducing ARV products from regional warehouses based on confirmed orders.

Main Results:

  • Supply, demand, and financial factors significantly influence the success of ARV supply chain transitions.
  • A multi-stakeholder approach enhances transition planning and execution.
  • Regularly updated national quantification and supply plans are crucial for managing ARV stock.
  • Introducing ARVs based on firm orders from regional warehouses optimizes supply chain efficiency.

Conclusions:

  • Comprehensive planning and attention to supply chain factors are vital for seamless ARV regimen transitions.
  • Effective supply chain management enables the global ARV market to adapt to treatment shifts.
  • Ensuring uninterrupted patient access to HIV medication requires meticulous logistical coordination.