To be delivered transdermally, an ideal drug should have the following properties: low molecular weight (less than 1000 Da), affinity for lipophilic and hydrophilic phases, low melting point, have a short half-life and non-irritating.
TDD is a painless method of systemic drug delivery that involves applying a drug formulation to healthy, undamaged skin. Without building up in the dermal layer, the medication first goes through the stratum corneum and then deeper layers of epidermis and dermis.
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