A Review on Controlled Release Microsphere

Abstract

The development of controlled release drug delivery systems has emerged as a promising strategy to improve therapeutic efficacy, minimize dosing frequency, and enhance patient compliance, particularly in chronic conditions such as hyperlipidemia. This review focuses on the formulation and evaluation of controlled release microspheres encapsulating Rosuvastatin and Fenofibrate—two potent lipid-lowering agents with complementary mechanisms of action. Microspheres, as multiparticulate systems, offer several advantages including uniform drug distribution, predictable pharmacokinetics, and reduced side effects. The review discusses various formulation approaches such as solvent evaporation, ionic gelation, and spray drying techniques, emphasizing the role of polymers like ethyl cellulose, Eudragit, and sodium alginate in modulating drug release kinetics. Critical formulation parameters—particle size, entrapment efficiency, surface morphology, in vitro release profile, and stability—are systematically analyzed to optimize therapeutic outcomes. Furthermore, the synergistic potential of Rosuvastatin and Fenofibrate in combination therapy is highlighted, offering a dual mechanism for effective management of mixed dyslipidemia. The review concludes that controlled release microsphere formulations of these drugs can significantly improve bioavailability and maintain sustained plasma concentrations, thereby enhancing lipid control and reducing cardiovascular risk.

Keywords: Controlled release microspheres; Rosuvastatin; Fenofibrate; Hyperlipidemia; Lipid-lowering agents; Combination therapy; Drug release kinetics; Ethyl cellulose.