A Review on Transdermal Drug Delivery Systems: Transdermal Patches

Transdermal Drug Delivery Systems (TDDS) have emerged as a pivotal facet of modern pharmacotherapy, offering a non-invasive route for systemic drug administration while enhancing patient compliance. This paper provides a comprehensive review of the historical evolution of TDDS, detailing its generational advancements and mechanisms of action. Various types of transdermal patches are explored, alongside their technical sophistication, advantages, and disadvantages. Key desirable features for effective transdermal patches are discussed, as well as potential adverse events associated with their use. The paper delves into the intricacies of skin and percutaneous absorption, highlighting the role of penetration enhancers and the multiple factors influencing transdermal permeability, including physiological and formulation characteristics. Conditions favoring and opposing the use of TDDS are examined, with a focus on drug selection, formulation strategies, and preparation methods. Evaluation techniques for assessing TDDS effectiveness are outlined, followed by an exploration of contemporary development approaches and advanced techniques aimed at enhancing TDDS performance. Finally, future directions and challenges facing the field are identified, underscoring the ongoing need for innovation in transdermal delivery technologies.