This unit focuses on how drugs form complexes with other molecules, which can significantly alter their solubility and absorption. It covers classification, methods of analysis, and the clinical significance of protein binding. 5. pH, Buffers, and Isotonic Solutions A crucial chapter for formulation scientists, it discusses: Sorensen’s pH scale and pH determination. Buffer equations and buffer capacity. Buffers in pharmaceutical and biological systems.

Dr. C.V.S. Subrahmanyam is a renowned academician and author in the field of pharmaceutical sciences. His writing style is celebrated for being student-friendly, breaking down complex mathematical derivations and physical concepts into easy-to-digest chapters. His textbooks are standard curriculum requirements in most Indian pharmacy colleges and are widely used across Asia and Africa. Key Topics Covered in the Textbook

While many students look for free PDF downloads, it is always recommended to support the author and publishers by purchasing the physical copy or an authorized e-book. Genuine copies ensure you have the most updated information, accurate tables, and complete appendices. The book is published by Vallabh Prakashan and is available on major e-commerce platforms. Conclusion

The role of surfactants and the HLB (Hydrophilic-Lipophilic Balance) scale. 4. Complexation and Protein Binding

This section covers the mechanisms of solute-solvent interactions, solubility expressions, and factors affecting solubility. It includes critical discussions on the solubility of liquids in liquids, solids in liquids (ideal and real solutions), and the distribution law (partition coefficient). 2. States of Matter and Physico-Chemical Properties

One of the most complex areas of pharmaceutics, this chapter explains: Surface and interfacial tension. Measurement methods (Capillary rise, Drop weight). Adsorption at liquid and solid interfaces.