Microemulsion: A Review

The improvement of bio-availability of drugs is one of the greatest challenges in drug formulations. Among various approach microemulsion, which is a clear, stable, isotropic mixtures of oil, water and surfactant, has gained more attention due to enhanced oral bio-availability, protect labile drug, control drug release, increase drug solubility, and reduce patient variability. This review is about the fundamental work characterizing the Physico-chemical behavior of microemulsions that needs to be performed before they can live up to their potential as multipurpose drug delivery vehicles. In order to appreciate the potential of microemulsions as delivery vehicles, this review gives an overview of the formation, phase behavior, characterization of microemulsions, and their application in different routes of drug delivery.