A key role by polymers in microneedle technology: a new era

The skin serves as the major organ in the targeted transdermal drug delivery system for many compounds. The microneedle acts as a novel technique to deliver drugs across the different layers of the skin, including the major barrier stratum corneum, in an effective manner. A microneedle array patch comprises dozens to hundreds of micron-sized needles with numerous structures and advantages resulting from their special and smart designs. The microneedle approach is much more advanced than conventional transdermal delivery pathways due to several benefits like minimally invasive, painless, self-administrable, and enhanced patient compliance. The microneedles are classified into hollow, solid, coated, dissolving, and hydrogel. Several polymers are used to fabricate microneedle, such as natural, semi-synthetic, synthetic, biodegradable, and swellable polymers. Researchers in the preparation of microneedles also explored the combinations of polymers. The safety of the polymer used in microneedle is a crucial aspect to prevent toxicity in vivo. Thus, this review aims to provide a detailed review of microneedles and mainly focus on the various polymers used in the fabrication of microneedles.

Automated summary

Microneedles serve as a novel technique for delivering drugs across different layers of the skin, offering advantages such as minimally invasive, painless, self-administrable, and enhanced patient compliance. They come in various types including hollow, solid, coated, dissolving, and hydrogel, fabricated using different polymers for safety and effectiveness. This review focuses on the detailed exploration of microneedles and the diverse polymers used in their fabrication.