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Related Experiment Videos

Towards a universal dissolution medium for carbamazepine.

M A El-Massik1, O Y Abdallah, S Galal

  • 1Department of Pharmaceutics, Faculty of Pharmacy, University of Alexandria, Egypt. magdaelmassik@yahoo.com

Drug Development and Industrial Pharmacy
|August 16, 2006
PubMed
Summary

Developing a new dissolution medium for carbamazepine (CBZ) tablets prevents polymorphic transformation and ensures consistent drug release across different strengths, improving formulation assessment.

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Area of Science:

  • Pharmaceutical Sciences
  • Drug Delivery and Formulation

Background:

  • Carbamazepine (CBZ) exhibits polymorphic transformations, specifically from anhydrous (CBZ A) to dihydrate (CBZ D) form, impacting its dissolution behavior.
  • Existing dissolution testing methods for CBZ formulations, such as the USP system, show variability across different tablet strengths, necessitating improved assessment techniques.

Purpose of the Study:

  • To develop a novel dissolution medium for evaluating various carbamazepine (CBZ) formulations with differing strengths.
  • To identify a medium that inhibits the polymorphic transformation of anhydrous CBZ (CBZ A) to its dihydrate form (CBZ D) while maintaining adequate solubility and sink conditions.

Main Methods:

  • Investigated the effects of pH, sodium lauryl sulphate (SLS), polyvinylpyrrolidone (PVP), and methyl cellulose (MC) on CBZ dissolution and polymorphic stability.

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  • Monitored solution-mediated transformation of CBZ A to CBZ D using optical microscopy, FTIR, and DSC.
  • Evaluated dissolution profiles, solubility, and polymorphic transformation in various media, including water, SGF, SIF, and SLS solutions.

    • Main Results:

    • Different tablet strengths of the same CBZ formulation showed varied dissolution patterns in 1% SLS, which were minimized in 0.5% SLS.
    • CBZ A solubility was undetectable due to rapid transformation to CBZ D in tested media; 3% PVP offered 75 min protection, while 0.01% MC provided complete inhibition for 24 hours.
    • A selected medium of 0.5% SLS and 0.01% MC protected against transformation, increased CBZ A solubility, provided adequate sink for up to 400 mg CBZ, and yielded overlapping dissolution profiles for various strengths.

    Conclusions:

    • A novel dissolution medium comprising 0.5% SLS and 0.01% MC effectively inhibits carbamazepine polymorphic transformation and enhances dissolution assessment.
    • This optimized medium ensures consistent dissolution profiles across different CBZ tablet strengths, addressing limitations of current USP methods.
    • The developed system represents a significant advancement in solving carbamazepine dissolution challenges, potentially leading to revised regulatory testing standards.