The following are the various routes of administration of emulsions:

1. Oral emulsions: In general, O/W emulsions are preferred for internal use, as the oil is more readily absorbed in a fine state of subdivision through the gastrointestinal tract and the preparation becomes more palatable when water forms the continuous phase. Oral emulsions are also used to improve the absorption of the oil-soluble drugs such as vitamins A, D, E and K. Example 1: Liquid paraffin oral emulsion Liquid paraffin500 mlMethyl cellulose20 gVanillin0.5 gChloroform2.5 mlBenzoic acid solution20 mlSaccharin sodium0.05 gPurified water (q.s.)1000 mlUses: Laxative—It acts as an emollient purgative in chronic constipation, especially during pregnancy and in geriatrics.Example 2: Castor oil emulsion Castor oil16 mlGum acaciaq.s.Water80 mlUses: Purgative 
2. Rectal emulsions: Enemas can be formulated as O/W emulsions.
3. Topical emulsions: For external use, emulsions may be either O/W or W/O type. O/W emulsions have been used for formulation of moisturizing lotions, hand lotions and makeup foundation lotions. W/O emulsions are preferred when oily layers are desired to prevent moisture loss from the surface of skin or for barrier action and for cleansing action.Example 1: Cold cream Liquid paraffin20 gHard paraffin4.5 gLanette wax3.5 gGlycerin4.5 gWater17.5 gPropyl paraben0.1 gUses: Emollient