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Dosage Regimen: Fixed Dose

Dosage Regimen: Fixed Dose

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.
Fixed-dose regimens can be used for various routes of administration, including intravenous (IV) injections and oral medications. For IV administration, a predetermined amount of the drug is...

Dosage Regimens: Designs and Approaches

Dosage Regimens: Designs and Approaches

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...

Dosage Regimen: Individualization

Dosage Regimen: Individualization

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...

Rational Dosage Regimen: Maintenance Dose and Loading Dose

Rational Dosage Regimen: Maintenance Dose and Loading Dose

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.
In most cases, drugs are administered repetitively or infused continuously to maintain a steady-state concentration in the body. At a steady state,...

Dosage Regimen Designs: Nomograms and Tabulations

Dosage Regimen Designs: Nomograms and Tabulations

Nomograms and tabulations are vital tools used by clinicians to design accurate and individualized dosage regimens. These instruments provide a straightforward method for adjusting dosages based on individual patient characteristics, including age, weight, and physiological condition. The foundation of a drug's nomogram is population pharmacokinetic data collected and analyzed using specific models. This data simplifies complex equations, presenting them diagrammatically or tabularly for easy...

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

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

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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Related Experiment Video

Updated: Jun 17, 2026

An Affordable HIV-1 Drug Resistance Monitoring Method for Resource Limited Settings

An Affordable HIV-1 Drug Resistance Monitoring Method for Resource Limited Settings

Published on: March 30, 2014

Irrational fixed dose combinations in Nepal: need for intervention.

A Poudel¹, S Palaian, P R Shankar

¹Drug Information and Pharmacovigilance Center, Manipal Teaching Hospital, Pokhara, Nepal. poudelarjaan@gmail.com

Kathmandu University Medical Journal (KUMJ)

|January 15, 2010

Summary

This summary is machine-generated.

Many drug combinations offer little healthcare value, increasing risks and costs. Evaluating these fixed-dose combinations is crucial for patient safety and effective primary healthcare.

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Last Updated: Jun 17, 2026

An Affordable HIV-1 Drug Resistance Monitoring Method for Resource Limited Settings

An Affordable HIV-1 Drug Resistance Monitoring Method for Resource Limited Settings

Published on: March 30, 2014

Area of Science:

Pharmacology
Public Health
Drug Regulation

Background:

A significant number of available drugs do not meet primary healthcare needs.
Combination drugs pose risks including increased side effects, ineffective dosages, potential for abuse, and higher costs.
Identifying the cause of adverse reactions is complicated by drug combinations, and their stability can compromise efficacy.

Purpose of the Study:

To highlight the prevalence of irrational drug combinations in Nepal.
To emphasize the need for screening licensed and available drug combinations.
To differentiate between rational and irrational fixed-dose combinations and their impact on healthcare.

Main Methods:

Review of existing literature on drug combinations and essential medicines.
Analysis of the landscape of drug availability in Nepal, particularly concerning fixed-dose combinations.
Comparison with screening systems implemented in developed and developing countries.

Main Results:

The Fifteenth WHO model list of essential medicines (March 2007) includes only 25 approved fixed-dose combinations.
Nepal has numerous easily accessible, often prescription-free, irrational drug combinations.
Developed and developing countries employ screening systems for drug combinations.

Conclusions:

Irrational fixed-dose combination products can be harmful, despite their easy availability.
Rational drug combinations can significantly benefit the healthcare system by improving quality of life and patient compliance.
Implementing a robust screening system for drug combinations is essential for public health.