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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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Determination of Multiple Dosing Parameters: Loading and Maintenance Doses

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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Depolarizing blockers are administered through intravenous injection. Succinylcholine is the most common choice of depolarizing blockers in emergency clinical practices. Although they have a rapid onset, they readily diffuse away from the motor end plate into the extracellular fluid. They are metabolized by enzymes such as liver butyrylcholinesterase and plasma pseudocholinesterases. This produces a short duration of action, typically 5-10 minutes long, unlike nondepolarizing blockers, which...
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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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Pharmaceutical Alternatives: Stability-Related Therapeutic Nonequivalence

Generic intravenous (IV) drugs are considered bioequivalent to their branded counterparts due to their 100% bioavailability upon administration. However, variations in stability among different drug products can significantly influence their therapeutic performance, even if they are pharmaceutically equivalent.Cefuroxime, a prophylactic antimicrobial, is often used as a single-dose IV injection for patients undergoing coronary artery bypass grafting surgery. A 3 g dose typically provides...
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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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Updated: May 8, 2026

Postconditioning with Lactate-enriched Blood for Cardioprotection in ST-segment Elevation Myocardial Infarction
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Stability of Milrinone Lactate 200 micrograms/mL in 5% Dextrose Injection and 0.9% Sodium Chloride Injection.

F Wong1, M A Gill

  • 1Department of Clinical Pharmacy,university of Southern California.

International Journal of Pharmaceutical Compounding
|August 31, 2013
PubMed
Summary

Milrinone lactate injection is stable for 14 days when mixed with dextrose or saline solutions. This stability was confirmed at both room and refrigerated temperatures, ensuring medication integrity.

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Area of Science:

  • Pharmaceutical Science
  • Drug Stability Studies
  • Analytical Chemistry

Background:

  • Milrinone lactate is a critical care medication used for heart failure.
  • Understanding the stability of intravenous drug formulations is essential for safe and effective patient care.
  • Standardized stability data is required for clinical use and storage recommendations.

Purpose of the Study:

  • To evaluate the stability of milrinone lactate 200 microgram/mL in common intravenous solutions.
  • To determine the stability profile when stored at room and refrigerated temperatures.
  • To establish the shelf-life of milrinone lactate admixtures.

Main Methods:

  • Milrinone lactate solutions were prepared in 5% dextrose injection and 0.9% sodium chloride injection.
  • Samples were stored in polyvinyl chloride bags at room (20-25°C) and refrigerated (2-8°C) temperatures.
  • Stability was assessed using a stability-indicating high-performance liquid chromatography assay at various time points up to 14 days.

Main Results:

  • Milrinone lactate maintained 90% or greater of its original concentration throughout the 14-day study period.
  • No visual changes such as color alteration, haziness, or precipitation were observed in any samples.
  • The drug demonstrated consistent potency in both dextrose and saline admixtures under tested conditions.

Conclusions:

  • Milrinone lactate 200 microgram/mL is stable for 14 days when admixed with 5% dextrose injection or 0.9% sodium chloride injection.
  • The formulation remains stable at both ambient and refrigerated storage conditions.
  • These findings support the extended use of these milrinone lactate admixtures in clinical settings.