Over the last few years the controlled drug delivery becomes a predominant method for treatment for most of the diseases. In this book the importance of porous osmotic pump tablets over the matrix tablets for controlled delivery of Diclofenac sodium (DS) were elucidated. The solubility of DS is highly pH dependent. The matrix tablets (MT) were prepared by direct compression method. The porous osmotic pump tablets (CPOP) were designed using D-Optimal design. All formulations were evaluated for various physicochemical parameters and in vitro drug release kinetic studies were determined and...