A review on microsphere

Abstract

Microspheres are characteristically free flowing powders having particle size ranging from 1-1000 μm consisting of proteins or synthetic polymers. The range of Techniques for the preparation of microspheres offers a Variety of opportunities to control aspects of drug administration and enhance thetherapeutic efficacy of a given drug. There are various approaches in delivering a therapeutic substance to the target site in a sustained controlled release fashion. It is the reliable means to deliverthe drug to the target site with specificity, if modified, and to maintain the desired concentration at the site of interest. Moreover the microspheres are of micron size so they can easily fit into various capillary beds which are also having micron size. Microspheres received much attention not only for prolonged release, but also for targeting of anticancer drugs. There are various departments ofmedicine like cancer, pulmonary, cardiology, radiology, gynecology, and oncology etc., numerous drugs are used and they are delivered by various types of drug delivery system. Among them microspheric drugdelivery system has gained enormous attention. The purpose of the review is to compile various types of microspheres, different methods to preparation, its applications and also various parameters to evaluate their efficiency.