Abstract: 
Sustained drug delivery systems are designed to deliver drug, at predetermined rates for predefined periods of time, and have been used to overcome the shortcoming of conventional drug formulations. And in the recent approach for the sustained drug delivery has been the development of microspheres using albumin as a polymer to sustain the release of the drug. This review deals with the methods used and the results obtained by the use of albumin (bovine serum albumin and egg albumin) as a polymer in the formulation in various research works. The in vitro studies in various research works give a very promising statement that albumin can be used as a polymer in the formulation at a large scale without much of the complications.

Keywords: Sustained Drug Delivery, Microspheres, Bovine Serum Albumin, Egg Albumin.