Long-term controlled navel administration of testosterone

Area of Science:

• Endocrinology
• Reproductive Medicine
• Drug Delivery Systems

Background:

• Male fertility is influenced by sustained testosterone levels.
• Existing methods for testosterone administration may lack long-term control.
• Need for a reliable, extended-release testosterone delivery system.

Purpose of the Study:

• To develop and evaluate a novel disk-shaped, bandage-type device for controlled, long-term testosterone release.
• To assess the in vitro and in vivo performance of the testosterone-releasing device.

Main Methods:

• Development of a disk-shaped, bandage-type device for testosterone delivery.
• In vitro drug elution studies to determine release kinetics.
• In vivo studies in rhesus monkeys to assess plasma levels and urinary excretion over 46 days.

Main Results:

• In vitro studies confirmed a constant release profile of testosterone.
• In vivo studies demonstrated steady plasma testosterone levels and constant urinary excretion rates for over 32 days.
• Systemic bioavailability was more than twofold higher compared to direct application or placebo devices, with over 90% dose recovery within a month.

Conclusions:

• The developed bandage-type device provides a controlled and sustained release of testosterone.
• This system offers improved systemic bioavailability and efficacy for potential male fertility regulation.
• The in vitro and in vivo data support the device's potential for long-term therapeutic applications.