Over the past three decades, new techniques have been encouraged for the development of novel carriers for drug delivery. In that Advanced Drug Delivery Systems (DDS) present undoubtable benefits for drug administration. Our human body may be accomplished by several anatomic routes for the introduction of drugs. To reach the therapeutic purpose, the choice of the most suitable route of administration is of indubitable importance. The drugs can be introduced directly to the target tissue or organ or can be delivered by systemic routes. The main precedence of advanced drug delivery systems over traditional systems is the ability to deliver a drug more selectively to a specific site, easier, more accurate, absorption that is more consistent with the site and mechanism of action, decreased variability in systemic drug concentrations and reductions in toxic metabolites.
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