Abstract
Microspheres having free flowing powder characteristics, which are consisting of synthetic polymers and proteins. These are biodegradable in nature having particle size less than 200um. Microspheres are the multiparticulate drug delivery systems which are consisting from natural and synthetic material. Microsphere improves bioavailability, stability and target the drug to specific site at predetermined rate. types of microspheres are bioadhesive, floating, radioactive, polymeric and biodegradable microspheres. Microspheres are particularly used in novel drug delivery system. Keywords: microsphere, advantages, types, method of preprations.
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