Emulsion: Emulsion are usually liquid preparation which are prepared by addition emulsifying agent and purified water to liquid drugs. It is two phase system in which are liquid is dispersed in the form of small droplets through ought another liquid. It is a stable mixture of two immiscible liquids combined with surfactants to change there compatibility with stabilizers that increases viscosity.

Pharmaceutical emulsions are liquid disperse systems in which the dispersed phase is composed of small globules of a liquid distributed throughout a vehicle in which it is immiscible.

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