Skin is an attractive site for systemic drug delivery, and many new vehicles have been developed that promote good skin per- meation [1]. In addition, topical delivery of drugs for skin diseases is effective with few systemic side effects. The choice of vehicle is made based on the type of skin condition. Ointments, creams ,and lotions are common dosage forms. Lotion is especially convenient for use on the scalp (or other site with hair)or to cover large areas because it has low viscosity and is easy to spread. However, lotion does possess some disadvantages: drugs with low water solubility require solubilizing agents and procedures; the formulation of lotion is affected by the vaporization of some ingredients after application to skin that leaves drug and additives on the skin surface, which can cause irritation; and the amount of drug per unit area is relatively small and the duration of effectiveness is short when applied on damaged skin because lotion does not provide controlled release as an ointment does [10]. Thus, a new vehicle consisting of an oil-in-water (o/w)emulsion lotion(EL),
which can accommodate poorly water-soluble drugs in the oil phase and provides controlled release, was developed.