Transdermal drug delivery: penetration enhancement techniques

Area of Science:

• Pharmacology and Pharmaceutical Sciences
• Dermatology
• Drug Delivery Systems

Background:

• The skin acts as a barrier, limiting drug absorption for local and systemic effects.
• The stratum corneum is a primary obstacle to topical and transdermal drug bioavailability.
• Effective skin penetration enhancement is crucial for expanding therapeutic options.

Purpose of the Study:

• To review and categorize various techniques for enhancing skin drug penetration.
• To discuss strategies involving drug/vehicle optimization and stratum corneum modification.
• To explore the mechanisms of penetration enhancers and retarders for clinical use.

Main Methods:

• Literature review of existing skin penetration enhancement techniques.
• Categorization of methods based on drug/vehicle optimization (e.g., prodrugs, liposomes).
• Discussion of stratum corneum modification approaches (e.g., hydration, chemical enhancers).

Main Results:

• Drug/vehicle optimization includes strategies like supersaturated solutions, eutectic systems, and nano-carriers.
• Stratum corneum modification involves hydration, chemical agents targeting lipids/keratin, and altering partitioning.
• Understanding enhancer/retarder mechanisms is key to clinical application.

Conclusions:

• Various drug formulation and stratum corneum modification techniques can significantly enhance skin penetration.
• These methods offer potential for improved topical and transdermal drug delivery, broadening therapeutic applications.
• Further research into enhancer mechanisms can optimize clinical use for better drug bioavailability.