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Related Experiment Videos

Cyclodextrins in acetazolamide eye drop formulations

H O Ammar1, S A El-Nahhas, R M Khalil

  • 1Department of Pharmaceutical Sciences, National Research Centre, Dokki, Cairo, Egypt.

Die Pharmazie
|September 19, 1998
PubMed
Summary
This summary is machine-generated.

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Acetazolamide complexation with cyclodextrins (CDs) enhances its solubility and permeation. This study shows CDs significantly improve acetazolamide

Area of Science:

  • Pharmaceutical Sciences
  • Physical Chemistry
  • Drug Delivery

Background:

  • Acetazolamide is a carbonic anhydrase inhibitor used to treat glaucoma and epilepsy.
  • Cyclodextrins (CDs) are cyclic oligosaccharides known for their ability to form inclusion complexes with various drugs.
  • Improving acetazolamide's solubility and bioavailability is crucial for effective therapeutic outcomes.

Purpose of the Study:

  • To investigate the complexation of acetazolamide with different cyclodextrins (beta-CD, DM-beta-CD, TM-beta-CD).
  • To evaluate the impact of cyclodextrins on acetazolamide's solubility, membrane permeation, and topical delivery.
  • To assess the effect of cyclodextrins on acetazolamide's bioavailability and pharmacological performance in vivo.

Main Methods:

  • Spectrophotometric analysis to monitor complex formation and determine binding constants.

Related Experiment Videos

  • Solubility studies to quantify the increase in apparent solubility of acetazolamide with varying CD concentrations.
  • In vitro permeation studies using semi-permeable membranes to assess drug penetration.
  • In vivo studies in rabbits measuring intraocular pressure to evaluate bioavailability and pharmacological effects.

    • Main Results:

    • Equimolar complexes of acetazolamide with beta-CD, DM-beta-CD, and TM-beta-CD were formed.
    • Acetazolamide's apparent solubility in water increased linearly with cyclodextrin concentration.
    • Optimal cyclodextrin concentrations were determined for maximum acetazolamide penetration.
    • Cyclodextrin complexation significantly enhanced acetazolamide's intensity, bioavailability, and duration of action in rabbits.

    Conclusions:

    • Cyclodextrins effectively form inclusion complexes with acetazolamide, enhancing its aqueous solubility.
    • Complexation with cyclodextrins improves acetazolamide's permeation and topical delivery characteristics.
    • Cyclodextrin-mediated delivery of acetazolamide leads to augmented pharmacological effects and improved bioavailability, offering a promising strategy for drug formulation.