Solid dispersions of testosterone with reduced presystemic inactivation.

Area of Science:

• Pharmacology
• Drug Delivery Systems
• Biochemistry

Background:

• Testosterone is a vital hormone with therapeutic applications.
• Optimizing oral testosterone delivery remains a challenge due to its complex absorption.
• Solid dispersions offer a potential strategy to enhance drug bioavailability.

Purpose of the Study:

• To investigate the dissolution rates of testosterone solid dispersions.
• To evaluate the oral absorption efficiency of selected testosterone solid dispersions.
• To identify optimal formulations for improved testosterone oral absorption.

Main Methods:

• Solid dispersions of testosterone were prepared using various lipids and polyethylene glycol 6000, with and without surfactants.
• Dissolution rates were measured for these solid dispersions.
• Oral absorption efficiency was assessed in a single male subject by analyzing urinary testosterone metabolites to testosterone ratios.

Main Results:

• Dissolution rates varied depending on the lipid or polyethylene glycol 6000 used.
• Significant reductions in urinary testosterone metabolites to testosterone ratios were observed.
• These reductions were noted for a 1:4 weight ratio of testosterone-polyethylene glycol 6000 and a 1:4:0.25 weight ratio of testosterone-cholesteryl stearate-sorbitan monolaurate.

Conclusions:

• Testosterone solid dispersion formulations can significantly impact oral absorption.
• Specific ratios of testosterone with polyethylene glycol 6000 and cholesteryl stearate-sorbitan monolaurate show promise for enhanced oral delivery.
• Further research is warranted to validate these findings in larger studies.