There are many nanostructures that can be used as drug delivery vehicles and that, at the same time offer some significant advantages over traditional delivery mechanisms. These advantages include high stability, the possibility of transporting both hydrophilic and hydrophobic drugs, high carrying capacity due to greatly increased surface area, better bioavailability, systems that allow controlled release rates or release upon an external stimulus, and the possibility to exploit a range of patient-friendly delivery routes, e.g. oral, transdermal, inhalation.

 14 December 2009- Source: http://www.nano.org.uk/articles/26/

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