Development of self-microemulsifying tablets containing dutasteride for enhanced dissolution and pharmacokinetic...

Area of Science:

• Pharmaceutical Sciences
• Drug Delivery Systems

Background:

• Hydrophobic drugs like dutasteride present challenges in oral administration and absorption.
• Self-microemulsifying drug delivery systems (SMEDDS) offer a strategy to enhance the solubility and bioavailability of poorly soluble drugs.

Purpose of the Study:

• To develop self-microemulsifying tablets of dutasteride for improved oral administration and in vivo absorption.
• To evaluate the performance of solidified SMEDDS compared to liquid formulations and conventional products.

Main Methods:

• Formulation of SMEDDS using specific lipids and surfactants (Capmul® MCM, Captex® 355, Cremophor® EL).
• Evaluation of droplet size and dissolution profiles in gastric medium.
• Solidification of SMEDDS onto porous silicon microparticles (Neusilin® US2) and assessment of adsorption/desorption properties.
• Comparison of in vivo bioavailability of developed tablets versus conventional soft gelatin capsules.

Main Results:

• SMEDDS formulations demonstrated enhanced dissolution compared to raw dutasteride and Avodart®.
• Neusilin® US2 showed favorable characteristics for SMEDDS solidification, but initial desorption was incomplete.
• Optimization of pore adsorption with polyvinylpyrrolidone achieved complete drug desorption.
• Self-microemulsifying tablets significantly improved dutasteride bioavailability (29.9% and 15.2%) compared to the soft gelatin product.

Conclusions:

• The developed self-microemulsifying tablets effectively solubilize dutasteride.
• The system ensures rapid and complete drug desorption from the solid carrier.
• This formulation strategy leads to enhanced in vivo performance and bioavailability of hydrophobic drugs.