Emulsion

Emulsions and creams are disperse systems in which an insoluble liquid phase is dispersed within a second liquid phase.
Creams are emulsions that offer greater consistency (viscosity) and are applied topically.

•  Emulsions and creams are termed either oil in water (o/w), in which oil is the disperse phase and water the external phase, or water in oil (w/o), in which water is the disperse phase and oil is the external phase.
• The major use of emulsions is as cream formulations (for external application); however, emulsions may also be administered intravenously rectally or orally.

• primarily to stabilize the physical Emulsions/creams are physically unstable: the various excipient in the formulation are present properties of the system.