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Determination of Multiple Dosing Parameters: Steady-State, Minimum and Maximum Concentrations01:15

Determination of Multiple Dosing Parameters: Steady-State, Minimum and Maximum Concentrations

Gentamicin, an aminoglycoside antibiotic, is commonly administered via intermittent intravenous infusion to treat severe infections. An intermittent one-hour infusion of gentamicin, administered at eight-hour intervals, allows for precise control of plasma drug concentrations, minimizing toxicity while ensuring therapeutic efficacy. Pharmacokinetic principles govern the dynamics of plasma concentrations and can be mathematically described using specific equations.The plasma drug concentration...
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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...
Dosage Regimens: Designs and Approaches01:28

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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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Aminoglycosides are a class of antibiotics used to treat various bacterial infections. Clinicians must determine the elimination rate constant (k) and volume of distribution (VD) to optimize therapeutic efficacy and minimize toxicity. The k value represents the rate at which the drug is removed from the body, and the VD reflects the degree to which the drug distributes into body tissues. Accurately estimating these parameters allows healthcare professionals to tailor drug dosing to individual...
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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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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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Generic Protocol for Optimization of Heterologous Protein Production Using Automated Microbioreactor Technology
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Evaluation of a daptomycin dose-optimization protocol.

Truc T Tran1, Hannah R Palmer, Jaye Weston

  • 1College of Pharmacy, University of Houston (UH), Houston, TX 77030, USA.

American Journal of Health-System Pharmacy : AJHP : Official Journal of the American Society of Health-System Pharmacists
|May 22, 2012
PubMed
Summary
This summary is machine-generated.

A new protocol improved daptomycin dosing for vancomycin-resistant enterococci (VRE) infections. Doses increased, and safety monitoring improved, optimizing treatment for hospitalized patients.

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Area of Science:

  • Infectious Diseases
  • Pharmacology
  • Antimicrobial Stewardship

Background:

  • Vancomycin-resistant enterococci (VRE) infections require effective antibiotic strategies.
  • Daptomycin is a key agent, with optimal activity against VRE at doses of ≥8 mg/kg.
  • Optimizing daptomycin dosing is crucial for patient outcomes.

Purpose of the Study:

  • To evaluate the impact of an institutional protocol on daptomycin dosing for VRE infections.
  • To assess changes in prescribing behavior and safety monitoring after protocol implementation.

Main Methods:

  • A retrospective study compared daptomycin use before and after protocol implementation.
  • The protocol recommended higher daptomycin doses (≥8 mg/kg) and baseline/weekly CPK monitoring.
  • Educational initiatives preceded protocol rollout.

Main Results:

  • Mean daptomycin dose increased from 6.1 mg/kg to 7.6 mg/kg post-protocol.
  • Proportion of patients receiving ≥8 mg/kg increased significantly (4% to 52%).
  • Rate of baseline creatinine phosphokinase (CPK) assessment improved (43% to 64%).

Conclusions:

  • Institutional protocol successfully optimized daptomycin dosing for VRE infections.
  • Implementation led to increased mean daptomycin dose and improved safety monitoring.
  • Multidisciplinary antimicrobial stewardship is effective in optimizing antibiotic therapy.