Nanoparticles as Drug Delivery Systems

*Guzmán Carissimi, Mercedes G. Montalbán, Marta G. Fuster and Gloria Víllora*

## **Abstract**

This chapter presents a review on the design of nanoparticles which have been proposed as drug delivery systems in biomedicine. It will begin with a brief historical review of nanotechnology including the most common types of nanoparticles (metal nanoparticles, liposomes, nanocrystals and polymeric nanoparticles) and their advantages as drug delivery systems. These advantages include the mechanism of increased penetration and retention, the transport of insoluble drugs and the controlled release. Next, the nanoparticle design principles and the routes of administration of nanoparticles (parental, oral, pulmonary and transdermal) are discussed. Different routes of elimination of nanoparticles (renal and hepatic) are also analyzed.

**Keywords:** nanoparticle, drug delivery, insoluble drug, controlled release, route of administration
