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An emulsion is liquid preparation containing two immiscible liquids, one of which is dispersed as globules (dispersed phase = internal phase) in the other liquid (continuous phase = external phase).
• Microemulsion: Droplets size range 0.01 to 0.1 m
• Macroemulsion: Droplets size range approximately 5 m.
General Types of Pharmaceutical Emulsions:
1) Lotions
2) Liniments
3) Creams
4) Ointments
5) Vitamin drops
Primary and secondary emulsion:
• Primary emulsion containing one internal phase, for example, oil-in-water emulsion (o/w) and water-in-oil emulsion (w/o).
• Secondary emulsion= multiple-emulsion: it contains two internal phase, for instance, o/w/o or w/o/w. It can be used to delay release or to increase the stability of the active compounds.
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