Preparation of Microemulsion for Transedermal Drug Delivery System

The microemulsion is a very suitable carrier medium for the drug delivery system. With the help of microemulsion penetrate the suitable drug in the body by oral, topical, and parenteral administration. The microemulsion is thermodynamically stable isotropically clear dispersion of two immiscible liquid, such as oil and water and stabilized by an interfacial film of surfactant and co-surfactant molecules. Currently the microemulsion is a rising worldwide importance in a variety of technological application. Microemulsion behave like supersolvents of drug. There are advantages that they can solubilize both hydrophilic and hydrophobic drug. In this review brief discussion about microemulsion such as definition, types, formation characteristics, stability, the effect of additives, pressure, temperature on the phase behavior of microemulsion.