Nanotechnology is a broad field which involves variety of applications including drug delivery, diagnostics etc. In recent years there has been increasing interest in the drug delivery for reducing the dose and targeting the drug to the site of action. This leads to development of novel systems like nano drug delivery systems. In these systems, nanoparticles hold special features like controlled / targeted drug delivery and reduced side effects. This review article throws light on advantages, method of preparation, characterization and applications of nanoparticles.
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