Formulation of a reservoir-type testosterone transdermal delivery system

Area of Science:

• Pharmaceutical Sciences
• Materials Science

Background:

• Testosterone (TS) replacement therapy often requires effective transdermal delivery systems.
• Optimizing permeation enhancers and membrane properties is crucial for transdermal drug delivery.

Purpose of the Study:

• To develop a reservoir-type transdermal delivery system for testosterone (TS).
• To enhance the skin permeation rate of TS using novel formulation strategies.
• To evaluate the in vivo performance of the developed transdermal system.

Main Methods:

• Formulation of a reservoir-type transdermal system using an ethanol/water cosolvent system.
• Incorporation of dodecylamine as a skin permeation enhancer.
• Utilizing ethylene vinyl acetate (EVA) membranes with varying vinyl acetate content.
• Addition of hydroxypropyl methylcellulose (HPMC) as a gelling agent.
• In vivo study comparing plasma concentration profiles with a commercial product (Androderm®).

Main Results:

• A significant increase in testosterone permeation rate from 2.69 to 47.83 microg/cm(2)/h was achieved with 1.0% dodecylamine.
• Testosterone permeation rate increased with higher vinyl acetate content in the EVA membrane.
• HPMC addition improved rheological properties without negatively impacting permeation.
• The developed transdermal patch demonstrated comparable in vivo plasma concentration profiles to Androderm®.

Conclusions:

• A novel and effective transdermal delivery system for testosterone was successfully developed.
• Dodecylamine and EVA membrane composition are key factors for enhancing testosterone permeation.
• The formulation shows potential for improved testosterone replacement therapy.