A Review on Pharmaceutical Emulsion

The pharmaceutical term “emulsion” is most time used to indicate preparations prepared for internal use. This pharmaceutical dosage form is thermodynamically unstable and must be stabilized by the addition of emulsifying agent.  Emulsified systems range from lotions having comparatively low viscosity to creams which are more viscous. There are two basic types of emulsions, that is, oil in water (O/W) and water in oil (W/O).  In addition to these two types, a relatively complex emulsion, called multiple emulsions can also be formulated.  Emulsions  generally  have  certain advantages  over  other  dosage forms  as  the  drug solubilized  may  be  more  bioavailable.  Moreover, gastrointestinal problems and first pass metabolic effect are also avoided.