Transdermal drug delivery system has become the focus of formulation
research in the last decade owing to its advantages like easy
accessibility, non invasiveness, compliance, safety and effectiveness.
In United States around 40% of the drug delivery candidate products
under clinical evaluation were related to transdermal or dermal systems.
Nevertheless, its clinical application has been limited due to barrier
properties of skin, especially the stratum corneum. To enhance the
permeation of drugs through the skin many attempts have been made by the
investigators that led to development of several technologies. The
prodrug approach represents an alternative and promising method of
enhancing the skin permeability of drugs by increasing the
lipophilicity. Iontophoresis technique has been gaining much popularity
by overcoming skin barrier to drugs and by expanding the range of drugs
that could be administered through the transdermal route. This book
describes about the synthesis of prodrugs of selected antihypertensive
agents, assessment of physicochemical properties and in vitro assessment
by passive permeation and iontophoresis for transdermal delivery.