This book explores advanced drug delivery systems developed through emulsification and solvent evaporation techniques, focusing on enhancing drug stability and prolonging therapeutic activity without compromising efficacy. It highlights the importance of preclinical studies to assess in vivo behavior, including organ distribution, metabolism, and pharmacokinetics. The content also addresses dosage optimization and the need for detailed kinetic studies before clinical application. With practical insights and case studies, the book serves as a guide for researchers aiming to develop stable, sustained-release formulations for improved therapeutic outcomes.