Current pharmaceutical design on adhesive based transdermal drug delivery systems

Area of Science:

• Pharmaceutical Sciences
• Biomaterials Science
• Dermatology

Background:

• Drug-in-adhesive transdermal systems utilize direct contact with the stratum corneum for systemic drug delivery.
• Key challenges include patient-specific variations in skin properties (age, gender, ethnicity, health) that affect drug permeation.
• Designing universal formulations for consistent adhesiveness, drug release, and permeation remains difficult.

Purpose of the Study:

• To review pressure-sensitive adhesives (PSAs) used in transdermal drug delivery.
• To elucidate the relationship between PSA molecular structure, formulation attributes, and performance.
• To discuss strategies for modulating PSA properties to optimize drug delivery and skin adhesion.

Main Methods:

• Literature review focusing on pressure-sensitive adhesives in transdermal drug delivery.
• Analysis of how adhesive properties (tackiness, strength, elasticity, hydrophilicity, suspension, swelling) influence drug release and permeation.
• Examination of molecular structure and formulation effects on adhesive performance.

Main Results:

• Adhesive properties are critical determinants of transdermal drug delivery efficacy.
• Tailoring adhesive molecular structure and formulation can modulate tackiness, strength, elasticity, hydrophilicity, drug suspension, and swelling.
• These modulations directly impact skin bonding, drug release kinetics, and drug permeation rates.

Conclusions:

• Understanding and manipulating PSA properties are essential for developing advanced transdermal drug delivery systems.
• Formulation strategies can overcome challenges posed by variable skin physiology.
• Optimized PSAs offer a pathway to improved and personalized transdermal therapies.