Microneedles: A Smart Approach for Advanced Drug Delivery – A Review

Microneedle technology has surfaced as a promising method for transdermal drug delivery, aimed at addressing the shortcomings of oral and hypodermic methods such as low bioavailability, first-pass metabolism, discomfort, and risks associated with needles. By creating miniature channels through the stratum corneum, microneedles facilitate painless and minimally invasive administration of various therapeutics, including vaccines, peptides, proteins, biomolecules, and cosmeceuticals. Their distinctive designs—solid, coated, hollow, and dissolving or biodegradable—allow for both rapid and sustained drug release.[12] Progress in microfabrication techniques and biomaterials has enhanced the mechanical strength of microneedles, their penetration efficiency, and their controlled release capabilities, enabling applications that range from small-molecule drugs to larger macromolecules. This review aims to underscore recent developments in microneedle delivery systems, focusing on fabrication methods, material advancements, therapeutic uses, and safety aspects. Research indicates that microneedles significantly improve skin penetration, extend drug release duration, enhance stability, and boost patient compliance when compared to traditional methods. Additionally, microneedles eliminate sharp waste and mitigate needle-related anxiety, making them an appropriate choice for self-administration. Nonetheless, challenges persist, including the delivery of large biomolecules, ensuring consistent penetration through the skin, addressing large-scale production complexities, and fulfilling regulatory standards. Overall, microneedles serve as an innovative, safe, and user-friendly platform with considerable potential for future clinical applications.[3]