Related Experiment Videos
Preparation and characterization of albendazole beta-cyclodextrin complexes
J A Castillo1, J Palomo-Canales, J J Garcia
1Dpto. de Farmacia y Tecnología Farmacéutica, Facultad de Farmacia, Universidad Complutense de Madrid, Spain.
Drug Development and Industrial Pharmacy
|December 28, 1999
Summary
Beta-cyclodextrins (CyDs) enhance the solubility of low-soluble anthelmintics like albendazole (ABZ). Freeze-dried inclusion complexes, particularly with hydroxypropyl-beta-cyclodextrin (HPCD), significantly improved ABZ bioavailability in mice.
Area of Science:
- Pharmaceutical Sciences
- Drug Delivery Systems
- Medicinal Chemistry
Background:
- Albendazole (ABZ), mebendazole (MBZ), and ricobendazole (RBZ) are poorly soluble anthelmintic drugs.
- Enhancing aqueous solubility is crucial for improving the efficacy of these benzimidazole carbamates.
Purpose of the Study:
- To investigate the use of beta-cyclodextrins (CyDs) to increase the aqueous solubility and bioavailability of low-soluble anthelmintic drugs.
- To compare different types of beta-cyclodextrins (CD, HPCD, MCD) and preparation methods (coprecipitation, freeze-drying) for forming drug-cyclodextrin complexes.
Main Methods:
- Solubility studies were conducted with ABZ, MBZ, and RBZ using beta-cyclodextrin (CD), hydroxypropyl-beta-cyclodextrin (HPCD), and methyl-beta-cyclodextrin (MCD).
- Solid inclusion complexes were prepared via coprecipitation and freeze-drying, characterized by DSC and drug release studies.
- Bioavailability of an albendazole:HPCD complex was assessed in mice compared to a conventional suspension.
Main Results:
- Solubility increased with the degree of substitution of CyDs, with HPCD and MCD showing greater enhancement than CD.
- Freeze-drying yielded true inclusion complexes, which demonstrated an increased solubility rate for ABZ.
- The ABZ:HPCD complex formulation significantly reduced Tmax and increased AUC and Cmax in mice compared to ABZ suspension.
Conclusions:
- Beta-cyclodextrins, especially HPCD and MCD, effectively enhance the solubility of low-solubility anthelmintic benzimidazoles.
- Freeze-drying is a superior method for preparing stable and effective albendazole-cyclodextrin inclusion complexes.
- The ABZ:HPCD complex formulation offers improved pharmacokinetic properties, suggesting enhanced bioavailability for anthelmintic therapy.