Self-nanoemulsifying granules of ezetimibe: design, optimization and evaluation

Area of Science:

• Pharmaceutical Sciences
• Drug Delivery Systems
• Nanotechnology

Background:

• Ezetimibe, a lipophilic drug, exhibits poor oral bioavailability.
• Enhancing the solubility and dissolution rate of lipophilic drugs is crucial for improving their therapeutic efficacy.

Purpose of the Study:

• To formulate and characterize self-nanoemulsifying granules (SNGs) of ezetimibe.
• To enhance the bioavailability and dissolution rate of ezetimibe through SNG formulation.

Main Methods:

• Optimization of self-nanoemulsifying system (SNS) composition using various oils, surfactants, and cosurfactants.
• Formulation of SNGs by adsorbing SNS onto hydrophilic colloidal silicon dioxide.
• Characterization of SNGs using X-ray diffraction, differential scanning calorimetry, SEM, dissolution studies, and in vivo evaluation in rats.

Main Results:

• Optimized SNS formed stable nanoemulsions with small globule size.
• XRD and DSC studies indicated solubilization and loss of crystallinity of ezetimibe in SNGs.
• SNGs demonstrated a significant increase in ezetimibe dissolution rate and a two to threefold increase in dissolution compared to plain drug capsules.
• In vivo studies in rats showed a significant reduction in total cholesterol levels.

Conclusions:

• Self-nanoemulsifying granules (SNGs) are an effective system for enhancing the dissolution and bioavailability of ezetimibe.
• SNGs hold significant potential for the improved delivery of poorly soluble lipophilic drugs.
• The formulation strategy offers a promising approach for overcoming bioavailability challenges in drug delivery.