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Related Concept Videos

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,...
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 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 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...
Equivalence: In Vitro and In Vivo Bioequivalence01:17

Equivalence: In Vitro and In Vivo Bioequivalence

Bioequivalence studies are crucial in evaluating whether new drugs can match an approved one regarding pharmacological effects and clinical performance. These studies test if drugs, despite different dosage forms, share identical plasma concentration-time profiles. Three types of equivalence are central to these studies: chemical, pharmaceutical, and therapeutic. Chemical equivalence indicates that two or more drug products contain identical active ingredients in equal amounts. Pharmaceutical...
Pharmaceutical Equivalents01:26

Pharmaceutical Equivalents

As defined by regulatory standards, pharmaceutical equivalents require generic drug products to have identical dosage forms and chemically identical active pharmaceutical ingredients (APIs). They must adhere to compendial or applicable standards for potency, content uniformity, disintegration times, and dissolution rates. In the case of modified-release dosage forms, variations in drug content are permissible as long as the delivered amount remains consistent with the innovator drug product.

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Related Experiment Video

Updated: May 24, 2026

In Vitro Methods for Comparing Target Binding and CDC Induction Between Therapeutic Antibodies: Applications in Biosimilarity Analysis
07:25

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Published on: May 4, 2017

Estimating product bioequivalence for highly variable veterinary drugs.

R Claxton1, J Cook, L Endrenyi

  • 1Schafer Veterinary Consultants, Fort Collins, CO, USA.

Journal of Veterinary Pharmacology and Therapeutics
|March 15, 2012
PubMed
Summary

This study explores alternative methods for assessing bioequivalence in highly variable veterinary drugs, addressing challenges unique to animal medicine. It proposes modifications to existing human drug bioequivalence approaches for veterinary applications.

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Area of Science:

  • Pharmacokinetics and Drug Bioequivalence
  • Veterinary Pharmacology
  • Regulatory Science

Background:

  • Large intrasubject pharmacokinetic variability is observed in both human and veterinary drugs.
  • The scaled average bioequivalence (SABE) approach, used by the FDA's CDER for human drugs, requires adaptation for veterinary dosage forms.
  • Unique challenges in veterinary medicine necessitate variations of the CDER's SABE approach.

Purpose of the Study:

  • To discuss highly variable drugs (HVD) and highly variable veterinary drugs (HVVD).
  • To present alternative approaches for assessing product bioequivalence (BE) in veterinary medicine.
  • To highlight limitations of current crossover study designs and propose statistical analysis strategies for HVVD.

Main Methods:

  • Review and discussion of existing bioequivalence assessment methods for highly variable drugs.
  • Enumeration of limitations associated with 3- and 4-way crossover study designs in veterinary medicine.
  • Exploration of alternative statistical analyses, including parallel study designs, secondary criteria (test-to-reference ratio), definition of σ(0), and average BE with expanding limits.

Main Results:

  • Identified limitations in applying standard human bioequivalence study designs to veterinary highly variable drugs.
  • Proposed the need for statistical analysis of HVVD in parallel study designs.
  • Raised considerations for secondary criteria, defining σ(0), and average bioequivalence with expanded limits for veterinary drugs.

Conclusions:

  • Existing bioequivalence assessment methods need adaptation for highly variable veterinary drugs.
  • Further discussion and finalization are required regarding regulatory constants and the definition of 'highly variable' in veterinary drug products.
  • Collaboration between academicians, industrial scientists, and regulators is crucial to resolve these details.