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Related Experiment Videos

Enhanced bioavailability of digoxin by gamma-cyclodextrin complexation

K Uekama, T Fujinaga, M Otagiri

    Journal of Pharmacobio-Dynamics
    |September 1, 1981
    PubMed
    Summary
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    Formulating digoxin with gamma-cyclodextrin (gamma-CyD) significantly enhances its dissolution and oral absorption. This inclusion complex improved digoxin bioavailability 5.4-fold in dogs, suggesting potential for reduced oral dosage.

    Area of Science:

    • Pharmaceutical Sciences
    • Drug Delivery Systems
    • Physical Chemistry

    Background:

    • Digoxin is a crucial medication for heart conditions, but its oral absorption can be limited.
    • Improving digoxin's dissolution rate is key to enhancing its therapeutic efficacy.
    • Cyclodextrins are known excipients for improving drug solubility and bioavailability.

    Purpose of the Study:

    • To prepare an inclusion complex of digoxin with gamma-cyclodextrin (gamma-CyD).
    • To evaluate the impact of gamma-CyD complexation on digoxin's dissolution and absorption characteristics.
    • To assess the potential for reduced digoxin dosage through complexation.

    Main Methods:

    • Preparation of a 1:4 molar ratio inclusion complex of digoxin with gamma-cyclodextrin.

    Related Experiment Videos

  • Comparative analysis of dissolution rates of digoxin and its gamma-CyD complex in water.
  • Assessment of oral bioavailability in a canine model.

    • Main Results:

    • Complexation with gamma-CyD markedly increased the dissolution rate of digoxin in water.
    • Oral administration of the digoxin-gamma-CyD complex resulted in a 5.4-fold increase in bioavailability in dogs compared to digoxin alone.
    • The study demonstrated improved dissolution and absorption of digoxin via inclusion complexation.

    Conclusions:

    • Inclusion complexation of digoxin with gamma-cyclodextrin significantly enhances its dissolution and oral absorption.
    • This improvement in bioavailability suggests a potential for reducing the required oral dose of digoxin in therapy.
    • Gamma-cyclodextrin is a promising agent for optimizing digoxin's pharmacokinetic profile.