Method of preparation

Nanoemulsions appeared as a novel drug delivery system which allows controlled or sustained release of drug and biological active ingredients. Nanoemulsion is a dispersion consisting of oil, surfactant and an aqueous phase, which is an isotropically clear and thermo-dynamically or kinetically stable liquid solution, usually with droplet diameter within the range of 1-100 nm. This review gives the idea about the nanoemulsions system and provides brief information about the method of preparation and evaluation of nanoemulsion as well as various pharmaceutical applications of nanoemulsions in drug delivery including parenteral and pulmonary drug delivery, cosmetics, cancer therapy, vaccine delivery, formulations for improved oral delivery of poorly soluble drug and in cell culture technology.