Conventional immediate release formulations present significant limitations including frequent dosing requirements, fluctuating plasma drug concentrations, poor patient compliance, and increased risk of adverse effects due to peak concentrations exceeding therapeutic windows. The aim of this article is to provide a comprehensive review of recent advances in controlled release drug delivery systems that address these challenges through innovative materials, formulation strategies, and release mechanisms. Key technological advances include the development of biodegradable and biocompatible polymer-based systems, sophisticated matrix and reservoir designs that enable predictable release kinetics, stimuli-responsive delivery platforms that respond to physiological triggers such as pH and temperature, and novel formulation approaches including nanoparticles, microparticles, hydrogels, and implantable devices. Controlled release systems have demonstrated substantial impact on therapeutic efficacy by maintaining drug concentrations within therapeutic ranges for extended periods, enhancing patient adherence through reduced dosing frequency, and improving safety profiles by minimizing concentration-related toxicity. The integration of these technologies into clinical practice has transformed treatment paradigms across multiple therapeutic areas including chronic disease management, oncology, and infectious diseases. Future outlook indicates continued evolution toward personalized medicine through smart drug delivery platforms incorporating biosensors, artificial intelligence-guided dosing algorithms, and patient-specific formulation parameters that optimize therapeutic outcomes while minimizing systemic exposure and adverse events.