The present conventional drug delivery systems often have side-effects and complication due to their wide distribution throughout the body fluids. The localization of drug action in injured tissue is promising way to solve this problem. The object of drug targeting is to achieve a desired pharmacological response at a selected site without undesirable interaction at other sites. At present drug targeting is achieved at one of two approaches: the first approach involves chemical modification of the parent compound to a derivative which is activated only at the target site. The second approach utilizes carriers such as liposomes, microspheres, nanoparticles, antibiotics, cellular carriers (erythrocytes and lymphocytes) and macromolecules to direct the drug at its site of action.