The book "Microstructured Interpenetrating Polymer Network Drug Delivery System" offers a comprehensive examination of novel interpenetrating network hydrogel microspheres made from xanthan gum and poly(vinyl alcohol). These microspheres were developed through a water-in-oil emulsion crosslinking process using glutaraldehyde to enable the controlled release of sodium diclofenac as a model drug. The authors, Subham Banerjee and Pronobesh Chattopadhyay, analyze various formulations optimized by adjusting the ratio of xanthan gum to poly(vinyl alcohol) and the degree of crosslinking. The results demonstrate that the microspheres exhibit high drug encapsulation efficiency and controlled release, which was confirmed by various analytical methods such as FTIR, DSC, and XRD. The book is aimed at professionals and students in the fields of pharmacology and materials science who are interested in innovative drug delivery systems.