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Asian Journal of Pharmacy and Technology
Year : 2020, Volume : 10, Issue : 4
First page : ( 289) Last page : ( 295)
Print ISSN : 2231-5705. Online ISSN : 2231-5713.
Article DOI : 10.5958/2231-5713.2020.00048.3

A novel technique for intra transdermal delivery of drugs - coated polymeric needles

Usha A. Lakshmi1,*, Kumari M. Kusuma1, Rani E. Radha1, Bhavani A.V.S. Ksheera2

1Department of Pharmaceutics, Maharajah’s Collage of Pharmacy, Vizianagaram, Andhra Pradesh, India

2Department of Pharmaceutics, Sri Venkateswara College of Pharmacy, Madhapur, Hyderabad, Telanaga

*Corresponding Author E-mail: alakshmiusha@gmail.com

Online published on 27 April, 2021.


The barrier properties of the topmost layer of the skin, stratum corneum have significant limitations for successful systemic delivery of a wide range of therapeutic molecules, especially macromolecules and genetic material. One solution is to utilize microneedles (MNs), which are capable of painlessly traversing through the stratum corneum and directly translocating protein drugs into the systemic circulation. This strategy involves the use of micron sized needles fabricated from different materials and using different geometries to create transient aqueous conduits across the skin. Microneedles in isolation, or in combination with other enhancing strategies, have been shown to dramatically enhance the skin permeability of numerous therapeutic molecules including biopharmaceuticals either in vitro, ex vivo or in vivo. MNs can be designed to incorporate appropriate structural materials as well as therapeutics or formulations with tailored physicochemical properties. This platform technique has been applied to deliver drugs both locally and systemically in applications ranging from vaccination to diabetes and cancer therapy. As an alternative to hypodermic needles, coated polymer microneedles (MNs) are able to deliver drugs to subcutaneous tissues after being inserted into the skin. The dip-coating process is a versatile, rapid fabricating method that can form coated MNs in a short time. However, it is still a challenge to fabricate coated MNs with homogeneous and precise drug doses in the dip-coating process. This review article focuses on recent and potential future developments in microneedle technologies. This will include the detailing of progress made in microneedle design, an exploration of the challenges faced in this field and potential forward strategies to embrace the exploitation of microneedle methodologies, while considering the inherent safety aspects of such therapeutic tools. The clinical potential and future translation of MNs are also discussed.



Transdermal drug delivery, Microneedle, Hydrogel-forming, Safety, Vaccination, Drug monitoring, Public perception.


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