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condition, physicochemical factors and environmental factors are some factors that are to be considered while delivering drug through this route. Basic components ofÂ TDDS include polymer matrix, membrane, drug, penetration enhancers, pressure-sensitive adhesives, backing laminates, release liner, etc.Transdermal patches can be divided into various systems like reservoir
system, matrix system and micro-reservoir system, which are used to incorporate the active ingredients into the circulatory system via the skin.After preparation of transdermal patches, consistent methodology are adopted to test the adhesion properties,physicochemical properties, in vitro drug release studies, in vitro skin permeation studies, skin irritation studies and stability studies. According to the duration of therapy, various drugs are commercially available in the form of transdermal patches.
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