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Related Concept Videos

Bioequivalence studies: Biowaivers01:13

Bioequivalence studies: Biowaivers

In certain scenarios, in vitro dissolution tests can replace in vivo bioequivalence studies. This is particularly true when a drug product, though available in varying strengths, maintains proportional similarity in its active and inactive ingredients. In such cases, the need for in vivo bioequivalence studies for lower strength variants may be waived, provided dissolution tests and in vivo studies on the highest strength yield satisfactory results.Bioequivalence can be indicated through...
Bioequivalence of Drugs: Drugs with Multiple Indications01:09

Bioequivalence of Drugs: Drugs with Multiple Indications

The concept of therapeutic equivalence (TE) in drugs with multiple indications is complex. A generic drug may be therapeutically equivalent to a brand-name product for one specific indication, but this doesn't necessarily mean it's equivalent for all other indications. Evidence of TE in one patient group and bioequivalence shown in healthy volunteers can support—but not confirm—TE for other indications. However, definitive proof requires individual clinical studies for each indication due to...
Bioequivalence Data: Statistical Interpretation01:16

Bioequivalence Data: Statistical Interpretation

The statistical interpretation of bioequivalence data is a significant aspect of pharmaceutical research. Bioequivalence refers to the absence of any significant difference in the rate and extent to which the active ingredient in pharmaceutical products becomes available at the site of drug action when administered at the same molar dose under similar conditions. This helps determine if different drug products have similar absorption rates, ensuring their interchangeability.Statistical...
Bioequivalence: Overview01:16

Bioequivalence: Overview

Pharmaceutical equivalents, by definition, are drug products with the same active ingredient in the same quantities, encapsulated in identical dosage forms, and intended for the same administration routes. These pharmaceutical equivalents are deemed bioequivalent if the bioavailability of the active entity in the drug preparations is similar. Moreover, pharmaceutical equivalents demonstrating bioequivalence are also regarded as therapeutically equivalent. This means that when used as directed,...
Methods for Studying Drug Absorption: In situ01:09

Methods for Studying Drug Absorption: In situ

In situ experiments, such as the Doluisio method and Single-Pass Perfusion technique, provide critical insights into drug uptake by simulating in vivo conditions for drug absorption.
The Doluisio method involves perfusing a prepared segment of a rat's small intestine with a solution of radiolabeled drug and a non-absorbable marker. This helps to differentiate between absorbed and non-absorbed drug concentrations. The intestinal segment is connected at both ends using tubing and syringes,...
Drug Dissolution: Requirements and Profile Comparison01:14

Drug Dissolution: Requirements and Profile Comparison

The acceptance criteria for dissolution profile data are anchored in Q values, representing the percentage of drug dissolved within a specified period. This assessment unfolds in three stages:First Stage: The test passes if all six drug dosage units are equal to or greater than Q plus 5%; otherwise, the sample proceeds to the second stage.Second Stage: The average of twelve units must be equal to or greater than Q, with no unit falling below Q - 15% to pass; if not, it progresses to the final...

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[Bioequivalence study of sinomenine patch by microdialysis].

Jia-Jun Ling1, Yan Wang, Bo Xie

  • 1College of Pharmacy, Guangzhou University of Traditional Chinese Medicine, Guangzhou 510006, China. ljj@gzhtcm.edu.cn

Zhongguo Zhong Yao Za Zhi = Zhongguo Zhongyao Zazhi = China Journal of Chinese Materia Medica
|January 20, 2009
PubMed
Summary

This study compared the topical bioequivalence of sinomenine patches. Liposome gel patches demonstrated superior drug delivery and skin concentration compared to normal gel patches, validating microdialysis as a viable method.

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Area of Science:

  • Pharmacology
  • Dermal Drug Delivery
  • Analytical Chemistry

Background:

  • Assessing topical bioequivalence is crucial for drug formulation development.
  • Traditional methods for measuring drug concentration in skin can be invasive and labor-intensive.
  • Microdialysis offers a minimally invasive approach for real-time drug monitoring in tissues.

Purpose of the Study:

  • To evaluate the bioequivalence of sinomenine patches prepared via different methods.
  • To determine the feasibility and advantages of microdialysis in topical bioequivalence studies.
  • To compare the skin drug concentration of liposome gel versus normal gel sinomenine patches.

Main Methods:

  • Sinomenine normal gel and liposome gel patches were prepared.
  • Nude mice were used as experimental subjects.
  • Tissue homogenization and microdialysis were employed for drug sampling from the skin, with concentrations analyzed by High-Performance Liquid Chromatography (HPLC).

Main Results:

  • Tissue homogenization revealed higher residual drug in the skin from liposome gel patches.
  • Microdialysis showed greater instantaneous drug concentration in the skin with liposome gel patches.
  • The sinomenine concentration-time profiles in the skin align with findings from other dermal delivery system studies.

Conclusions:

  • Liposome gel sinomenine patches exhibit superior topical bioequivalence compared to normal gel patches.
  • Microdialysis is a feasible and effective method for studying the bioavailability and bioequivalence of topical preparations.
  • The findings support the use of liposomal formulations for enhanced dermal drug delivery.