Topical and transdermal drug delivery systems are intended for external use. They are often dermatologic products such as sunscreens, local anesthetics, antiseptics and antiinflammatory agents intended for localized action on one or more layers of the skin. Conversely, some transdermal drug delivery systems are designed for percutaneous route of drug delivery in which case skin is not the target. In such case, the drug must be absorbed across the skin which is made up of dermis and epidermis, especially the stratum corneum barrier including sweat glands, sebaceous glands, and hair follicles and pass into deeper dermal layers to reach the systemic blood circulation. Generally, substances intended for transdermal delivery systems are low molecular weight (100-500 Da), potent non-irritation and non-allergenic [2e4]. The delivery system can be categorized as either i) drug in adhesive or ii) drug in matrix systems. The drug is dispersed or dissolved in a polymer matrix and attached to an adhesive layer that contacts the skin. In some cases, the polymer matrix can act as the adhesive layer. Polymer matrix layers and/ or the added adhesive layer act as a control of the rate of delivery