Microemulsions are one in all the most effective candidates as novel drug delivery system due to their long time period stability, improved drug solubilization with simple preparation and administration. Surfactants and cosurfactants play crucial role to get stable, mild and clinically acceptable microemulsions in their optimized concentration, The main aim of the study to produce an efficient screening approach for the surfactant and cosurfactant selection for the excipients of microemulsion formulation development and to check the consequences of surfactant hydrophilic–lipophilic balance (HLB) as well solubilization stability process in microemulsion. The composition and extent of surfactants and cosurfactants were key variables for physicochemical properties of drug-loaded Microemulsions. The important aspects must be considered for a successful microemulsion process is that the stability of the liquid membrane. This study is an attempt to grasp the mechanism of the effect of the surfactant and chain length of co-surfactants within the microemulsion base formulation stability.

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Persistent and uncontrolled use of antibiotics results in development of bacterial resistant. The situation is getting worsen day by day and scientists are investigating thousands of potentially active drugs like molecule in laboratories around the world every day in search of effective antibiotics. During last decade considerable attention was given to five-member heterocyclic moieties while designing new antimicrobial agents. One of important heterocycle is five-membered 1,3,4-thiadiazole with unique bioisosteric properties displaying unusually wide spectrum of biological activities. This comprehensive review represent the recent 1,3,4-thiadiazole and its derivatives, which can be considered as potential antimicrobial agents in the period of 2015 and onwards. This review may help the medicinal chemists to develop new leads possessing 1,3,4-thiadiazole nucleus with higher efficacy and reduced side effects.